CN110836471A - Defrosting control method for fixed-frequency air conditioner - Google Patents
Defrosting control method for fixed-frequency air conditioner Download PDFInfo
- Publication number
- CN110836471A CN110836471A CN201810940331.1A CN201810940331A CN110836471A CN 110836471 A CN110836471 A CN 110836471A CN 201810940331 A CN201810940331 A CN 201810940331A CN 110836471 A CN110836471 A CN 110836471A
- Authority
- CN
- China
- Prior art keywords
- air conditioner
- frequency air
- fixed
- temperature
- defrosting
- 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.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner provided by the invention comprises the following steps: under the condition that the fixed-frequency air conditioner is in a heating working condition, detecting the external environment temperature TEnvironment(s)Detecting the temperature Tcoil of the inner coil in real time; when in useTEnvironment(s)And when the temperature is less than the dew point temperature, judging whether the fixed-frequency air conditioner enters a defrosting mode according to the temperature Tcoil of the inner coil. The utility model provides a utilize the size of interior coil pipe temperature and combine outer ambient temperature to characterize outer machine frosting degree innovatively to consequently judge the opportunity that the air conditioner got into the defrosting mode, avoid the fixed frequency air conditioner frequently to get into the defrosting, guarantee the defrosting effect, improve user experience.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner.
Background
The air conditioner as a device capable of adjusting the indoor environment temperature has the working principle that: the indoor environment temperature is lowered or raised by the refrigerant switching between the circulation lines through the high pressure/low pressure/gas/liquid state, namely, the air conditioner is in the cooling or heating working condition from the perspective of the indoor unit. When the air conditioner heats the operation, if outdoor coil pipe temperature under certain humidity condition crosses lowly can lead to the condition of frosting, and outdoor coil pipe frosting can lead to outdoor heat exchanger's heat exchange efficiency to reduce, influences the heating effect of air conditioner, reduces indoor environment's travelling comfort, influences user experience. Therefore, in the situation that the air conditioner is in the heating working condition, the outdoor coil of the air conditioner needs to be defrosted timely and effectively.
For a fixed-frequency air conditioner, the power supply frequency cannot be changed, and even if the indoor temperature reaches the set temperature, the air conditioner cannot automatically adjust the cooling or heating speed. Because the temperature of the external coil of the fixed-frequency air conditioner is not provided with a temperature sensor, the temperature of the external coil cannot be acquired, and therefore the defrosting time of the fixed-frequency air conditioner cannot be judged according to parameters such as the temperature of the external coil. In addition, the defrosting efficiency is accelerated due to the lack of auxiliary means in the conventional defrosting process, so that the conventional defrosting process is single and the efficiency is low.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
Based on the above problems in the background art, in order to improve the defrosting efficiency of the fixed-frequency air conditioner, the invention provides a defrosting control method for the fixed-frequency air conditioner, which comprises the following steps: under the condition that the fixed-frequency air conditioner is in a heating working condition, detecting the external environment temperature TEnvironment(s)Detecting the temperature Tcoil of the inner coil in real time; when T isEnvironment(s)When the temperature is less than the dew point temperature, whether the fixed-frequency air conditioner enters the air conditioner or not is judged according to the temperature Tcoil of the inner coil pipeA defrost mode.
In the above preferred embodiment of the defrosting control method for a fixed-frequency air conditioner, "when T" isEnvironment(s)When the temperature is less than the dew point temperature, the step of judging whether the fixed-frequency air conditioner enters a defrosting mode according to the temperature Tcoil of the inner coil comprises the following steps: and if Tcoil is less than the set temperature, enabling the fixed-frequency air conditioner to enter a defrosting mode, otherwise enabling the fixed-frequency air conditioner to maintain the current heating working condition.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the method further includes: and after the fixed-frequency air conditioner enters a defrosting mode, controlling an outdoor fan to rotate for a second set time at intervals of a first set time.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the first set time is any time between 2 and 4 minutes.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the first set time is 3 minutes.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the second set time is any time between 15 and 25 seconds.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the second set time is 20 seconds.
In a preferred embodiment of the above defrosting control method for a fixed frequency air conditioner, the fixed frequency air conditioner includes a bypass defrosting circuit, which is provided between a compressor and an outdoor unit of the fixed frequency air conditioner, for introducing high pressure gas discharged from the compressor into the outdoor unit to melt frost on a coil of the outdoor unit, the method includes: and after the fixed-frequency air conditioner enters a defrosting mode, starting the bypass defrosting loop.
In a preferred embodiment of the above-described defrosting control method for a fixed-frequency air conditioner, the method further includes: in the process of reversing the outdoor fan, closing the bypass defrosting loop; after the fan rotates reversely for a second set time, the bypass defrosting circuit is opened for a third set time; wherein the third set time is less than the first set time.
In a preferred embodiment of the above defrosting control method for a fixed frequency air conditioner, the third set time is any time between 9 and 11 seconds, or the third set time is 10 seconds.
Because the outer machine coil pipe of the fixed-frequency air conditioner is not provided with the temperature sensor, the opportunity of entering the defrosting mode cannot be judged by acquiring the temperature of the outer coil pipe, the inventor of the application finds through years of intensive research and repeated tests that the temperature of the inner coil pipe can also indirectly indicate the frosting condition of the outer coil pipe, therefore, the application innovatively utilizes the temperature of the inner coil pipe and combines the temperature of the outer machine to represent the frosting degree, and accordingly judges the opportunity of the air conditioner entering the defrosting mode, the fixed-frequency air conditioner is prevented from frequently entering the defrosting mode, the defrosting effect is ensured, and the user experience is improved. As a preferred example, after the air conditioner enters the defrosting mode, the defrosting efficiency is improved by controlling the outdoor fan to reverse at intervals, that is, controlling the outdoor fan to reverse for a period of time every time the frost is defrosted, in other words, after the frost is melted for a part, the frost layer is blown off quickly by the back blowing action of the outdoor fan.
Drawings
FIG. 1 is a principal flow diagram of the defrost control method of the present invention;
fig. 2 is a flowchart of a defrost control method of an embodiment of the present invention.
Detailed Description
In order to make the embodiments, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the embodiments are some, but not all embodiments of the present invention. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring first to fig. 1, fig. 1 is a main flowchart of a defrost control method of the present invention. As shown in fig. 1, the defrosting control method for a fixed frequency air conditioner of the present invention includes: s110, at the fixed-frequency air conditionerUnder the condition of heating working condition, detecting the external environment temperature TEnvironment(s)Detecting the temperature Tcoil of the inner coil in real time; s120, when TEnvironment(s)And when the temperature is lower than the dew point temperature, judging whether the fixed-frequency air conditioner enters a defrosting mode according to the temperature Tcoil of the inner coil. Because the outer unit coil of the fixed-frequency air conditioner is not provided with the temperature sensor, the time for entering the defrosting mode cannot be judged by acquiring the temperature of the outer coil, and the inventor of the application finds through years of intensive research and repeated tests that the temperature of the inner coil can also indirectly indicate the frosting condition of the outer coil, so that the application innovatively utilizes the temperature of the inner coil and combines the temperature of the outer environment to represent the frosting degree of the outer unit, and judges the time for the air conditioner to enter the defrosting mode. Further, the dew point temperature refers to the temperature at which the air is cooled to saturation without changing both the moisture content and the air pressure.
Specifically, when TEnvironment(s)If Tcoil is less than the set temperature, the fixed-frequency air conditioner enters a defrosting mode, otherwise, the fixed-frequency air conditioner maintains the current heating working condition. Wherein, the set temperature can be reasonably set by the technicians in the field according to the actual situation of the fixed-frequency air conditioner. It can be understood by those skilled in the art that as the frosting degree of the outdoor unit increases, the temperature of the inner coil decreases, and when the external environment temperature is lower than the dew point temperature, it can be determined that the outdoor unit has frosted, and at this time, if the temperature of the inner coil is lower than the set temperature, it indicates that the heating capacity of the fixed-frequency air conditioner is relatively low, that is, the frosting of the fixed-frequency air conditioner is relatively serious, and at this time, the defrosting mode needs to be entered. Thus, at TEnvironment(s)On the premise of the dew point temperature being lower than the dew point temperature, the frosting degree of the outdoor unit can be accurately judged by utilizing the size of the inner coil pipe, the fixed-frequency air conditioner is prevented from frequently defrosting, the defrosting effect is ensured, and the user experience is improved.
In a preferred implementation, referring to fig. 2, fig. 2 is a flow chart of a defrost control method according to an embodiment of the present invention. As shown in FIG. 2, first, step S210 is executed to detect the external environment temperature TEnvironment(s)Detecting the temperature Tcoil of the inner coil in real time; then, step S220 is executed to determine the ambient temperature TEnvironment(s)And the inner coil temperature Tcoil, if TEnvironment(s)If the dew point temperature is less than the preset temperature and Tcoil is less than the preset temperature, the step S230 is carried out, the outdoor fan is controlled to rotate for a second preset time every first preset time, and if not, the step S210 is carried out. Wherein, the first set time can be 3 minutes, or can be any time between 2 and 4 minutes; the second set time may be 20 seconds or any time between 15 and 25 seconds. Therefore, after the air conditioner enters the defrosting mode, the outdoor fan is controlled to rotate reversely at intervals, namely the fan is controlled to rotate reversely for a period of time every time when defrosting is carried out, in other words, after frost is melted for a part, the frost layer is blown off quickly by utilizing the reverse blowing effect of the outdoor fan, and therefore the defrosting efficiency is improved. Compared with the traditional defrosting mode, namely the condition that the frost layer is required to be gradually separated from the outdoor unit or completely melted into water, the defrosting method can more quickly finish defrosting operation and effectively reduce the influence of the defrosting process on the indoor temperature.
Further, the fixed frequency air conditioner comprises a bypass defrosting circuit, wherein the bypass defrosting circuit is arranged between a compressor and an outdoor unit of the fixed frequency air conditioner and is used for introducing high-pressure gas discharged by the compressor into the outdoor unit so as to melt frost layers on a coil pipe of the outdoor unit. In this embodiment, after the fixed-frequency air conditioner enters the defrost mode, the bypass defrost loop is turned on. Preferably, during the reverse rotation of the outdoor fan, the bypass defrosting circuit is closed; after the outdoor fan rotates reversely for a second set time, starting a bypass defrosting loop for a third set time; wherein the third set time is less than the first set time. As an example, the third set time may be 10 seconds, or the third set time may be any value between 9-11 seconds. Therefore, when the outdoor fan is controlled to reversely rotate at intervals, the bypass defrosting circuit is correspondingly controlled to be closed, and the bypass defrosting circuit is opened after the reverse rotation is finished for the preset time, so that the reverse rotation of the outdoor fan is staggered with the opening state of the bypass circuit, the influence of the reverse rotation of the outdoor fan on the bypass defrosting is avoided, and the defrosting efficiency is greatly improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrost control method for a fixed frequency air conditioner, the method comprising the steps of:
under the condition that the fixed-frequency air conditioner is in a heating working condition, detecting the external environment temperature TEnvironment(s)Detecting the temperature Tcoil of the inner coil in real time;
when T isEnvironment(s)And when the temperature is less than the dew point temperature, judging whether the fixed-frequency air conditioner enters a defrosting mode according to the temperature Tcoil of the inner coil.
2. The defrost control method for a fixed frequency air conditioner as claimed in claim 1, wherein when T is "TEnvironment(s)When the temperature is less than the dew point temperature, the step of judging whether the fixed-frequency air conditioner enters a defrosting mode according to the temperature Tcoil of the inner coil comprises the following steps:
and if Tcoil is less than the set temperature, enabling the fixed-frequency air conditioner to enter a defrosting mode, otherwise enabling the fixed-frequency air conditioner to maintain the current heating working condition.
3. The defrost control method for a fixed frequency air conditioner of claim 1, further comprising: and after the fixed-frequency air conditioner enters a defrosting mode, controlling an outdoor fan to rotate for a second set time at intervals of a first set time.
4. A defrost control method for a fixed frequency air conditioner according to claim 3, characterized in that said first set time is any time between 2-4 minutes.
5. The defrost control method for a fixed frequency air conditioner according to claim 4, wherein the first set time is 3 minutes.
6. A defrost control method for a fixed frequency air conditioner according to claim 5, characterized in that said second set time is any time between 15-25 seconds.
7. A defrost control method for a fixed frequency air conditioner according to claim 6, characterized in that said second set time is 20 seconds.
8. The defrosting control method for a fixed frequency air conditioner according to any one of claims 1 to 7, wherein the fixed frequency air conditioner includes a bypass defrosting circuit provided between a compressor and an outdoor unit of the fixed frequency air conditioner for introducing high pressure gas discharged from the compressor into the outdoor unit to melt frost on a coil of the outdoor unit,
the method comprises the following steps:
and after the fixed-frequency air conditioner enters a defrosting mode, starting the bypass defrosting loop.
9. A defrost control method for a fixed frequency air conditioner according to claim 8 when dependent on any one of claims 3 to 7, characterized in that said method further comprises:
in the process of reversing the outdoor fan, closing the bypass defrosting loop;
after the fan rotates reversely for a second set time, the bypass defrosting circuit is opened for a third set time;
wherein the third set time is less than the first set time.
10. A defrost control method for a fixed frequency air conditioner according to claim 9, characterized in that said third set time is any time between 9-11 seconds or said third set time is 10 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940331.1A CN110836471A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for fixed-frequency air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940331.1A CN110836471A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for fixed-frequency air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110836471A true CN110836471A (en) | 2020-02-25 |
Family
ID=69573509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810940331.1A Pending CN110836471A (en) | 2018-08-17 | 2018-08-17 | Defrosting control method for fixed-frequency air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110836471A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160320110A1 (en) * | 2015-04-30 | 2016-11-03 | Daikin Industries, Ltd. | Air conditioner |
| CN106352629A (en) * | 2016-08-22 | 2017-01-25 | 珠海格力电器股份有限公司 | Air conditioner and bypass heating defrosting control method thereof |
| CN106369750A (en) * | 2016-09-08 | 2017-02-01 | 广东美的暖通设备有限公司 | Defrosting control method and defrosting control device of air conditioner and air conditioner |
| CN106766437A (en) * | 2017-01-24 | 2017-05-31 | 青岛海尔空调器有限总公司 | Air-conditioner defrosting control method and device |
-
2018
- 2018-08-17 CN CN201810940331.1A patent/CN110836471A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160320110A1 (en) * | 2015-04-30 | 2016-11-03 | Daikin Industries, Ltd. | Air conditioner |
| CN106352629A (en) * | 2016-08-22 | 2017-01-25 | 珠海格力电器股份有限公司 | Air conditioner and bypass heating defrosting control method thereof |
| CN106369750A (en) * | 2016-09-08 | 2017-02-01 | 广东美的暖通设备有限公司 | Defrosting control method and defrosting control device of air conditioner and air conditioner |
| CN106766437A (en) * | 2017-01-24 | 2017-05-31 | 青岛海尔空调器有限总公司 | Air-conditioner defrosting control method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110836504B (en) | Defrosting control method for air conditioner | |
| CN110836505B (en) | Defrosting control method for air conditioner | |
| CN110836503B (en) | Defrosting control method for air conditioner | |
| CN110836493A (en) | Defrosting control method for air conditioner | |
| CN110836470B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836444B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836472B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836466B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836492B (en) | Defrosting control method for air conditioner | |
| CN110836471A (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836463A (en) | Defrosting control method for air conditioner | |
| CN110836453A (en) | Defrosting control method for air conditioner | |
| CN110836467B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836445B (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836450A (en) | Defrosting control method for air conditioner | |
| CN110836482A (en) | Defrosting control method for air conditioner | |
| CN110836475B (en) | Defrosting control method for air conditioner | |
| CN110836477A (en) | Defrosting control method for fixed-frequency air conditioner | |
| CN110836506B (en) | Defrosting control method for air conditioner | |
| CN110836474B (en) | Defrosting control method for air conditioner | |
| CN110836449B (en) | Defrosting control method for air conditioner | |
| CN110836481B (en) | Defrosting control method for air conditioner | |
| CN110836489B (en) | Defrosting control method for air conditioner | |
| CN110836478B (en) | Defrosting control method for air conditioner | |
| CN110836476A (en) | Defrosting control method for fixed-frequency air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200225 |
|
| RJ01 | Rejection of invention patent application after publication |