CN203867925U - Fan and air conditioning - Google Patents
Fan and air conditioning Download PDFInfo
- Publication number
- CN203867925U CN203867925U CN201420225849.4U CN201420225849U CN203867925U CN 203867925 U CN203867925 U CN 203867925U CN 201420225849 U CN201420225849 U CN 201420225849U CN 203867925 U CN203867925 U CN 203867925U
- Authority
- CN
- China
- Prior art keywords
- output shaft
- wind wheel
- motor
- blower fan
- fastening piece
- 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 - Lifetime
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 14
- 230000000452 restraining effect Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model provides a fan and an air conditioning. The fan comprises a wind wheel, a motor and an elastic fixing part; the motor is provided with an output shaft; the elastic fixing part is provided with a first installing hole which is matched with the output shaft; the diameter of the first installing hole is smaller than that of the output shaft; the wind wheel and he elastic fixing part are arranged on the output shaft of the motor in turn; the wind wheel is fixed on the output shaft of the motor through the elastic fixing part. The wind wheel is fixed on the output shaft of the motor through the interference fit of the elastic fixing part and the output shaft of the motor, the fixation mode of the wind wheel and the motor is simple in structure and convenient to install, and accordingly the assembly efficiency of products is improved, namely that the production efficiency of the products is improved, and accordingly the manufacturing cost of the products is reduced. Meanwhile the vibration produced in the working process of the wind wheel can be absorbed by the elastic fixing part and accordingly the vibration transmission between the wind wheel and the motor is reduced and accordingly the motor noise caused by the mechanical vibration is reduced.
Description
Technical field
The utility model relates to air-conditioning technical field, in particular to a kind of blower fan and the air-conditioning that contains this blower fan.
Background technique
Motor and wind wheel are the core components of blower fan, and are all High Rotation Speed members, in order to ensure the steady running of blower fan, the Placement between above-mentioned two members have been proposed to following requirement:
1, between wind wheel and motor be connected must be firm, to guarantee that the two is without relative movement;
2,, in order to reduce the transmission of mechanical vibration, being connected between wind wheel and motor must or have damping buffering with certain flexibility.
At present, Placement in prior art between wind wheel and motor is: utilize the shaft hole matching between the hole, flat position on flat limit structure and the wind wheel on electric machine rotational axis to eliminate the relative rotary motion between the two, meanwhile, utilize at the locking nut of motor shaft end or tapped hole and the lock screw in outside, hole, the flat position of wind wheel and eliminate the motion to axial between the two.Although aforesaid way is connected firmly, too firm, be easy to the mechanical vibration of wind wheel to be passed to motor, the mounting bracket of motor even, thereby make the mechanical vibration of blower fan body produce noise; In prior art, connect flexible and dissipates vibration energy in order to improve, the flexible fitting seat that setting is made by elastic damping material between the running shaft of wind wheel and wind wheel body, to reduce the vibration transmission between wind wheel and motor.
But there are the following problems for above-mentioned prior art scheme:
1, be threaded and significantly reduced the production efficiency of assembling of product, thereby improved the manufacturing cost of product;
2, the structure of wind wheel becomes complexity, processing difficulties and is difficult to ensure the overall aerodynamic configuration of demonstrate,proving wind wheel original design.
Model utility content
In order one of to solve the problems of the technologies described above at least, an object of the present utility model be to provide a kind of simple in structure, efficiency of assembling is high, and can effectively alleviate the blower fan vibrating between wind wheel and motor.
Another object of the present utility model is to provide a kind of air-conditioning with above-mentioned blower fan
In view of this, the embodiment of the utility model first aspect provides a kind of blower fan, comprising: wind wheel, is provided with attachment hole on described wind wheel; Motor, on described motor, be provided with output shaft, described output shaft can insert in described attachment hole, and flexible fastening piece, on described flexible fastening piece, be provided with the first mounting hole matching with described output shaft, and the diameter of described the first mounting hole is less than the diameter of described output shaft; Wherein, described wind wheel and described flexible fastening piece are arranged on the described output shaft of described motor successively, and described flexible fastening piece is fixed on described wind wheel on the described output shaft of described motor.
The blower fan that the utility model provides, the interference fit of the output shaft by flexible fastening piece and motor, wind wheel is fixed on the output shaft of motor, the means of fixation of this kind of wind wheel and motor is simple in structure, easy for installation, thereby improve the efficiency of assembling of product, improved the manufacturing efficiency of product, and then the manufacturing cost of reduction product, simultaneously, flexible fastening piece can absorb the vibration that wind wheel produces in the course of the work, thereby reduce the vibration transmission between wind wheel and motor, and then reduce the noise that motor produces because of mechanical vibration, particularly, flexible fastening piece has the effect of screw of the prior art and flexible fitting seat, it is flexible fastening piece plays fixing and vibration damping simultaneously double action to wind wheel, thereby reduce the use of the middle screw of blower fan, reduced the production craft step of blower fan, and then improve the manufacturing efficiency of product, reduce manufacturing cost, simultaneously, the means of fixation of wind wheel and motor in the utility model, being rigidly connected between wind wheel of the prior art and motor become and flexibly connected, thereby effectively reduce the vibration transmission between wind wheel and motor, and then reduce the noise that motor produces because of mechanical vibration, improve the quality of product, increase the market competitiveness.
In addition, the blower fan in above-described embodiment that the utility model provides can also have following additional technical feature:
According to an embodiment of the present utility model, on the inwall of described the first mounting hole, be provided with annular protrusion, and be provided with the annular groove matching with described annular protrusion on described output shaft, described annular protrusion can snap in described annular groove.
According to an embodiment of the present utility model, described flexible fastening piece and described annular protrusion are integral type structure.
According to an embodiment of the present utility model, described flexible fastening piece is rubber fixed block.
According to an embodiment of the present utility model, described blower fan also comprises: auxiliary fixing member, is provided with the second mounting hole matching with described output shaft, and on the inwall of described the second mounting hole, is provided with location grab in described auxiliary fixing member; On described output shaft, be provided with the restraining groove matching with described location grab, described location grab can snap in described restraining groove.
According to an embodiment of the present utility model, described auxiliary fixing member and described location grab are integral type structure.
According to an embodiment of the present utility model, described auxiliary fixing member is rubber auxiliary fixing member.
According to an embodiment of the present utility model, flat limit structure is set on described output shaft, described attachment hole is the hole, flat position of matching with described flat limit structure.
According to an embodiment of the present utility model, described wind wheel is axial-flow windwheel.
The embodiment of the utility model second aspect provides a kind of air-conditioning, comprises the blower fan described in above-mentioned any one.
The blower fan that the air-conditioning that the utility model second aspect embodiment provides provides by first aspect embodiment is set, makes the advantages such as air-conditioning has use reliably, and noise is low, thereby has improved the quality of product, and then has increased the market competitiveness.
Additional aspect of the present utility model and advantage will become in description part below obviously, or recognize by practice of the present utility model.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present utility model and advantage, below combination, accompanying drawing is understood becoming embodiment's description obviously and easily, wherein:
Fig. 1 is the structural representation of blower fan described in the utility model;
Fig. 2 be in Fig. 1 A-A to sectional structure schematic diagram;
Fig. 3 is the structure for amplifying schematic diagram of B portion in Fig. 2;
Fig. 4 is the perspective view of motor shown in Fig. 2;
Fig. 5 is the structural representation of wind wheel shown in Fig. 2;
Fig. 6 is the structural representation of flexible fastening piece shown in Fig. 2;
Fig. 7 be in Fig. 6 C-C to sectional structure schematic diagram;
Fig. 8 is the structural representation of auxiliary fixing member shown in Fig. 2;
Fig. 9 be in Fig. 8 D-D to sectional structure schematic diagram.
Wherein, in Fig. 1 to Fig. 9, the corresponding relation between reference character and component names is:
1 wind wheel, 101 attachment holes, 2 motors, 201 output shafts, 2011 restraining grooves, 2012 flat limit structures, 3 flexible fastening pieces, 301 first mounting holes, 4 auxiliary fixing member, 401 second mounting holes, 402 location grabs.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the utility model; but; the utility model can also adopt other to be different from other modes described here and implement, and therefore, protection domain of the present utility model is not subject to the restriction of following public specific embodiment.
Describe according to blower fan described in some embodiments of the utility model below with reference to Fig. 1 to Fig. 9.
As shown in Figure 1, Figure 2, shown in Fig. 4 and Fig. 5, the blower fan that the utility model provides comprises: wind wheel 1, motor 2 and flexible fastening piece 3.
Wherein, on wind wheel 1, be provided with attachment hole 101; On motor 2, be provided with output shaft 201, output shaft 201 can insert in attachment hole 101; As shown in Figure 6 and Figure 7, on flexible fastening piece 3, be provided with the first mounting hole 301 matching with output shaft 201, and the diameter of the first mounting hole 301 is less than the diameter of output shaft 201; As shown in Figure 3, wind wheel 1 and flexible fastening piece 3 are arranged on the output shaft 201 of motor 2 successively, and flexible fastening piece 3 is fixed on wind wheel 1 on the output shaft 201 of motor 2.
The blower fan that the utility model provides, interference fit by flexible fastening piece 3 with the output shaft 201 of motor 2, wind wheel 1 is fixed on the output shaft 201 of motor 2, this kind of wind wheel 1 is simple in structure with the means of fixation of motor 2, easy for installation, thereby improve the efficiency of assembling of product, improved the manufacturing efficiency of product, and then the manufacturing cost of reduction product, simultaneously, flexible fastening piece 3 can absorb the vibration that wind wheel 1 produces in the course of the work, thereby reduce the vibration transmission between wind wheel 1 and motor 2, and then reduce the noise that motor 2 produces because of mechanical vibration.
In a specific embodiment of the present utility model, on the inwall of the first mounting hole 301, be provided with annular protrusion (not shown), and on output shaft 201, be provided with the annular groove (not shown) matching with annular protrusion, annular protrusion can snap in annular groove.
In this embodiment, the setting of annular protrusion and annular groove, increase the join strength between flexible fastening piece 3 and output shaft 201, thereby increase the join strength being connected between wind wheel 1 and motor 2, increased the operational safety of blower fan, and then the quality of the product having improved, increase the competitiveness of product in market.
In an embodiment of the present utility model, flexible fastening piece 3 is integral type structure with annular protrusion.
In this embodiment, flexible fastening piece 3 is integral type structure with annular protrusion, on the one hand, increase the join strength between annular protrusion and flexible fastening piece 3, thereby increased operational safety between annular protrusion and flexible fastening piece 3, and then increased the quality of product, on the other hand, flexible fastening piece 3 can be made into integration with annular protrusion, thereby has improved the manufacturing efficiency of product, and then has reduced the manufacturing cost of product.
In an embodiment of the present utility model, flexible fastening piece 3 is rubber fixed block.
In this embodiment, flexible fastening piece 3 adopts rubber to make, and can effectively absorb the vibration that wind wheel 1 produces, thereby has reduced the vibration transmission between wind wheel 1 and motor 2, and then has reduced the noise that motor 2 produces because of mechanical vibration.
Certainly, flexible fastening piece 3 also can also can adopt other materials to make, as silica gel etc., just do not exemplify one by one at this, but all should be in protection domain of the present utility model.
In an embodiment of the present utility model, as shown in Figures 2 and 3, blower fan also comprises: auxiliary fixing member 4, as shown in Figure 8 and Figure 9, in auxiliary fixing member 4, be provided with the second mounting hole 401 matching with output shaft 201, and on the inwall of the second mounting hole 401, be provided with location grab 402; As shown in Figure 4, be provided with and the restraining groove 2011 of locating grab 402 and matching on output shaft 201, location grab 402 can snap in restraining groove 2011.
In this embodiment, the setting of auxiliary fixing member 4, can effectively fix flexible fastening piece 3, further increase the join strength between wind wheel 1 and motor 2, thereby further increase the operational safety of blower fan, and then the quality of the product further having improved, further increase the competitiveness of product in market.
In an embodiment of the present utility model, auxiliary fixing member 4 is integral type structure with location grab 402.
In this embodiment, auxiliary fixing member 4 is integral type structure with location grab 402, on the one hand, increase the join strength between auxiliary fixing member 4 and location grab 402, thereby increased operational safety between auxiliary fixing member 4 and location grab 402, and then increased the quality of product, on the other hand, auxiliary fixing member 4 can be made into integration with location grab 402, thereby has improved the manufacturing efficiency of product, and then has reduced the manufacturing cost of product.
In an embodiment of the present utility model, auxiliary fixing member 4 is rubber auxiliary fixing member 4.
In this embodiment, auxiliary fixing member 4 adopts rubber to make, and can effectively absorb the vibration that wind wheel 1 produces, thereby has reduced the vibration transmission between wind wheel 1 and motor 2, and then has reduced the noise that motor 2 produces because of mechanical vibration.
Certainly auxiliary fixing member 4 also can also can adopt other materials to make, as silica gel etc., just do not exemplify one by one at this, but all should be in protection domain of the present utility model.
In a concrete real embodiment of the present utility model, flat limit structure 2012 is set, the flat position hole of attachment hole 101 for matching with flat limit structure 2012 on output shaft 201.
In an embodiment of the present utility model, wind wheel 1 is axial-flow windwheel.
Certainly, wind wheel 1 can be also oblique flow (mixed flow) wind wheel or centrifugal wind wheel etc., just do not exemplify one by one at this, but in all should protection domain of the present utility model.
The utility model also provides a kind of air-conditioning (not shown), comprises the described blower fan of above-mentioned any one enforcement.
The blower fan that the air-conditioning that the utility model provides provides by above-described embodiment is set, air-conditioning is had use reliable, the advantage of the low grade of noise, thus improved the quality of product, and then increased the market competitiveness.
In sum, the blower fan that the utility model provides, interference fit by flexible fastening piece 3 with the output shaft 201 of motor 2, wind wheel 1 is fixed on the output shaft 201 of motor 2, this kind of wind wheel 1 is simple in structure with the means of fixation of motor 2, easy for installation, thereby improve the efficiency of assembling of product, improved the manufacturing efficiency of product, and then the manufacturing cost of reduction product, simultaneously, flexible fastening piece 3 can absorb the vibration that wind wheel 1 produces in the course of the work, thereby reduce the vibration transmission between wind wheel 1 and motor 2, and then reduce the noise that motor 2 produces because of mechanical vibration, particularly, flexible fastening piece 3 has the effect of screw of the prior art and flexible fitting seat, it is flexible fastening piece 3 plays fixing and vibration damping simultaneously double action to wind wheel 1, thereby reduce the use of the middle screw of blower fan, reduced the production craft step of blower fan, and then improve the manufacturing efficiency of product, reduce manufacturing cost, simultaneously, the means of fixation of wind wheel 1 and motor 2 in the utility model, by being rigidly connected to become and flexibly connecting between wind wheel 1 of the prior art and motor 2, thereby effectively reduce the vibration transmission between wind wheel 1 and motor 2, and then reduce the noise that motor 2 produces because of mechanical vibration, improve the quality of product, increase the market competitiveness.
In the utility model, term " first ", " second ", " the only object for describing, and can not be interpreted as instruction or hint relative importance; Term " multiple " refers to two or more, unless separately there is clear and definite restriction.The terms such as term " installation ", " being connected ", " connection ", " fixing " all should be interpreted broadly, and for example, " connection " can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; " being connected " can be to be directly connected, and also can indirectly be connected by intermediary.For the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term in the utility model.
In the description of this specification, the description of term " embodiment ", " some embodiments ", " specific embodiment " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiments or example.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a blower fan, for air-conditioning, is characterized in that, comprising:
Wind wheel, is provided with attachment hole on described wind wheel;
Motor, is provided with output shaft on described motor, and described output shaft can insert in described attachment hole, and
Flexible fastening piece, be provided with the first mounting hole matching with described output shaft, and the diameter of described the first mounting hole is less than the diameter of described output shaft on described flexible fastening piece;
Wherein, described wind wheel and described flexible fastening piece are arranged on the described output shaft of described motor successively, and described flexible fastening piece is fixed on described wind wheel on the described output shaft of described motor.
2. blower fan according to claim 1, is characterized in that,
On the inwall of described the first mounting hole, be provided with annular protrusion, and be provided with the annular groove matching with described annular protrusion on described output shaft, described annular protrusion can snap in described annular groove.
3. blower fan according to claim 2, is characterized in that,
Described flexible fastening piece and described annular protrusion are integral type structure.
4. blower fan according to claim 3, is characterized in that,
Described flexible fastening piece is rubber fixed block.
5. according to the blower fan described in any one in claim 1 to 4, it is characterized in that, also comprise:
Auxiliary fixing member, is provided with the second mounting hole matching with described output shaft in described auxiliary fixing member, and on the inwall of described the second mounting hole, is provided with location grab; On described output shaft, be provided with the restraining groove matching with described location grab, described location grab can snap in described restraining groove.
6. blower fan according to claim 5, is characterized in that,
Described auxiliary fixing member and described location grab are integral type structure.
7. blower fan according to claim 6, is characterized in that,
Described auxiliary fixing member is rubber auxiliary fixing member.
8. blower fan according to claim 7, is characterized in that,
Flat limit structure is set on described output shaft, and described attachment hole is the hole, flat position of matching with described flat limit structure.
9. blower fan according to claim 8, is characterized in that,
Described wind wheel is axial-flow windwheel.
10. an air-conditioning, is characterized in that, includes blower fan as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225849.4U CN203867925U (en) | 2014-05-05 | 2014-05-05 | Fan and air conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420225849.4U CN203867925U (en) | 2014-05-05 | 2014-05-05 | Fan and air conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203867925U true CN203867925U (en) | 2014-10-08 |
Family
ID=51648885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420225849.4U Expired - Lifetime CN203867925U (en) | 2014-05-05 | 2014-05-05 | Fan and air conditioning |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203867925U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650843A (en) * | 2015-12-17 | 2016-06-08 | 宁波奥克斯空调有限公司 | Fan blade structure and air conditioner with same |
| CN106643828A (en) * | 2017-01-22 | 2017-05-10 | 上海康比利仪表有限公司 | Fixing device for encoder code disc |
| CN107489645A (en) * | 2017-09-06 | 2017-12-19 | 珠海格力电器股份有限公司 | Fan blade fixed structure and its installation and removal method |
| CN105650843B (en) * | 2015-12-17 | 2018-08-31 | 奥克斯空调股份有限公司 | A kind of blade structure and the air conditioner with it |
-
2014
- 2014-05-05 CN CN201420225849.4U patent/CN203867925U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650843A (en) * | 2015-12-17 | 2016-06-08 | 宁波奥克斯空调有限公司 | Fan blade structure and air conditioner with same |
| CN105650843B (en) * | 2015-12-17 | 2018-08-31 | 奥克斯空调股份有限公司 | A kind of blade structure and the air conditioner with it |
| CN106643828A (en) * | 2017-01-22 | 2017-05-10 | 上海康比利仪表有限公司 | Fixing device for encoder code disc |
| CN107489645A (en) * | 2017-09-06 | 2017-12-19 | 珠海格力电器股份有限公司 | Fan blade fixed structure and its installation and removal method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204956901U (en) | Screw connection structure and unmanned aerial vehicle | |
| CN203867925U (en) | Fan and air conditioning | |
| CN102705269A (en) | Silencing fan with two fan blades | |
| CN204118974U (en) | The variable-frequency motor mounting structure of standard axle sleeve type incremental encoder | |
| CN207124518U (en) | Motor and its bearing block mounting assembly | |
| CN204880353U (en) | Indoor set and air conditioner | |
| CN202707823U (en) | Shaft end supporting device and air duct type air conditioner with same | |
| CN202673711U (en) | Noise reduction fan with double fan blades | |
| CN202178646U (en) | Blower brush holder connection structure | |
| CN203962715U (en) | The coupling that a kind of self-alignment is anti-offset | |
| CN104034004B (en) | The air outlet structure of a kind of passenger vehicle | |
| CN213685018U (en) | High transmission torque motor flange | |
| CN105041687A (en) | Electric fan | |
| CN208623445U (en) | A kind of machine shaft support construction | |
| WO2021012341A1 (en) | Axial flow fan, air conditioning outdoor unit and air conditioner | |
| CN205544793U (en) | Variable frequency motor | |
| CN204113688U (en) | With the evaporation fan of vibration-damping function | |
| CN208754084U (en) | A kind of brushless motor magnetic rotor structure | |
| CN206807212U (en) | A kind of blower motor mounting structure | |
| CN202832746U (en) | Engine silicone oil clutch air fan assembly and engine, engineering machinery | |
| WO2019042073A1 (en) | Electric motor and bearing seat mounting assembly thereof | |
| CN218235554U (en) | Fastener assembly, electronic fan assembly, cooling system and vehicle | |
| CN211202405U (en) | Blower motor | |
| CN203146772U (en) | Transition shaft and gear mounting structure in lathe gearbox | |
| CN205590929U (en) | Sewing machine's swing lever |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |
|
| CX01 | Expiry of patent term |