CN103605254B - Projector's liquid cooling system liquid feeding and alarm time defining method and device - Google Patents
Projector's liquid cooling system liquid feeding and alarm time defining method and device Download PDFInfo
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- CN103605254B CN103605254B CN201310603700.5A CN201310603700A CN103605254B CN 103605254 B CN103605254 B CN 103605254B CN 201310603700 A CN201310603700 A CN 201310603700A CN 103605254 B CN103605254 B CN 103605254B
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Abstract
A kind of projector's liquid cooling system liquid feeding and alarm time defining method and device, described method comprises step: the first detecting point preset under one of them reflective photoelectric switch of level sensing platelet being placed in the current rotating speed of liquid pump, another reflective photoelectric switch is placed in the second default detecting point, and described second detecting point is lower than described first detecting point; If liquid pump rotating speed changes, level sensing platelet is moved according to the displacement determined, obtain new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding; Relatively liquid level and new first detect point, new second and is detected height a little, determines whether liquid feeding information, the warning information of display correspondence according to the result compared.The situations such as the inventive method and device can detect liquid level change in real time, and the liquid feeding time that the factory that effectively prevent because leakage etc. is caused is arranged is inaccurate, enable the safe and punctual work of projector.
Description
Technical field
The present invention relates to projector heat radiation technical field, particularly relate to a kind of projector liquid cooling system liquid feeding and alarm time defining method and device.
Background technology
During projector's work, heat is mainly derived from the imaging system of projector inside, the power unit of projector and projection bulb etc., if not in time these heats are discharged rapidly from projector, so these heats will make projector inside produce very high temperature, greatly reduce the work efficiency of projector, if worked long hours, projector also can shorten serviceable life greatly.
As shown in Figure 1, projector powers on and opens liquid pump and liquid cooling fan at once the principle of work of traditional projector's liquid cooling refrigeration system, and liquid coolant is circulated in LED water-cooling head and liquid cooling fan.LED-baseplate, by heat trnasfer, passes to the liquid coolant inside LED water-cooling head heats such as LED light sources, and the liquid coolant that the temperature that LED water-cooling head flows out is higher is sent in liquid cooling fan dispels the heat.If think that radiating effect is better, open refrigeration system, liquid coolant reduces through refrigeration system temperature, then circulation enters LED water-cooling head according to this, liquid cooling fan dispels the heat.
In current projector's liquid cooling system, producer, according to liquid coolant actual evaporation test data, provides the liquid feeding time of liquid cooling system.Projector is in operational process, and system can record the cumulative operation time of projector, and when it exceedes liquid feeding threshold time, control software design operation interface will point out liquid feeding.But all can there is the possibility of leakage in projector, once there is leakage, the liquid feeding time that producer provides will be no longer applicable, can have a strong impact on the use of projector, cause severe result after dispatching from the factory and in use procedure.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of projector liquid cooling system liquid feeding and alarm time defining method and device are provided.
A kind of projector's liquid cooling system liquid feeding and alarm time defining method, comprise step:
The the first detecting point preset under one of them reflective photoelectric switch of level sensing platelet being placed in the current rotating speed of liquid pump, another reflective photoelectric switch is placed in the second default detecting point, and described second detecting point is lower than described first detecting point;
If liquid pump rotating speed does not change, compare liquid level and first and detect point, second and detect height a little, determine whether to show corresponding liquid feeding information, warning information according to the result compared;
If liquid pump rotating speed changes, level sensing platelet is moved according to the displacement determined, obtain new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding;
Relatively liquid level and new first detect point, new second and is detected height a little, determines whether liquid feeding information, the warning information of display correspondence according to the result compared.
A kind of projector's liquid cooling system liquid feeding and alarm time determining device, comprising:
Be fixed on the vertical movement track of tank for coolant outer wall, if liquid pump rotating speed changes, level sensing platelet at described vertical movement rail moving, obtains new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding according to the displacement determined;
Be arranged on the level sensing platelet of described vertical movement track, comprise reflective photoelectric switch, differential comparator, the first detecting point that one of them reflective photoelectric switch is preset under being positioned at the current rotating speed of liquid pump, another reflective photoelectric switch is positioned at the preset second detecting point lower than described first detecting point, described differential comparator is detected point, new second detect height a little for being compared liquid level and new first, determines whether to show corresponding liquid feeding information, warning information according to the result compared; When liquid pump rotating speed does not change, described differential comparator is detected point, second detect height a little for being compared liquid level and first, determines whether to show corresponding liquid feeding information, warning information according to the result compared.
Above-mentioned projector liquid cooling system liquid feeding and alarm time defining method and device, when rotation speed change, move described level sensing platelet by the displacement calculated, and obtains new the first detecting point and new second and detect point after mobile.If liquid level is not higher than described the first detecting point newly, detect a little corresponding liquid feeding interface end export high level with new first, detect a little corresponding alarm interface end output low level with new second, point out liquid feeding.If liquid level is not higher than the new second detecting point, described liquid feeding interface end, alarm interface end all export high level, the too low alarm of liquid level.
Arrange the liquid feeding time compared to traditional factory, the present invention has the following advantages:
1, detect liquid level change in real time, the situations such as the liquid feeding time that the factory that effectively prevent because leakage etc. is caused is arranged is inaccurate, enable the safe and punctual work of projector;
2, oneself sets liquid feeding time and alarm time as required, and factory does not need to test the liquid feeding time of projector, saves the manpower and materials etc. of factory.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art projector liquid cooling refrigeration system;
Fig. 2 is the schematic flow sheet of the inventive method embodiment;
Fig. 3 is the schematic flow sheet that the present invention controls that level sensing platelet moves embodiment;
Fig. 4 is the structural representation of apparatus of the present invention embodiment;
Fig. 5 is the structural representation of level sensing platelet embodiment.
Embodiment
Be described in detail below in conjunction with the specific implementation method of accompanying drawing to projector of the present invention liquid cooling system liquid feeding and alarm time defining method.
As shown in Figure 2, a kind of projector liquid cooling system liquid feeding and alarm time defining method, comprise step:
S110, one of them reflective photoelectric switch of level sensing platelet is placed in the current rotating speed of liquid pump under the first detecting point of presetting, another reflective photoelectric switch is placed in the second default detecting point, described second detecting point is lower than described first detecting point, wherein said first detecting point is used for judging whether to need liquid feeding, and the second detecting point is for judging that whether liquid level is too low;
If S120 liquid pump rotating speed does not change, compare liquid level and first and detect point, second and detect height a little, determine whether to show corresponding liquid feeding information, warning information according to the result compared;
If S130 liquid pump rotating speed changes, level sensing platelet is moved according to the displacement determined, obtain new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding;
S140, compare liquid level and new first and detect point, new second and detect height a little, determine whether to show corresponding liquid feeding information, warning information according to the result compared.
When liquid pump rotating speed changes, the height of liquid level is vertical change, and the platelet of level sensing described in step S120 can move on vertical movement track, ensures the accuracy of level sensing.Tracks also can be tilt, but after level sensing platelet moves, reflective photoelectric switch likely can not detect liquid surface level due to Angulation changes, or the liquid level detected is not actual liquid level, and the degree of accuracy of level sensing is lower.Simultaneously because the front end face of reflective photoelectric switch needs to remain in specialized range with reflector, as a preferred embodiment, reflective photoelectric switch should against cooling tank wall as far as possible, ensures the sensitivity of detection.Reflective photoelectric switch also can replace with other functionally similar level switches.Can for the first detecting point, the second detecting point determined when rotating speed is 0 under current rotating speed in step S110, the first detecting point determined when also can be a concrete rotating speed, the second detecting point.Wherein first detecting point, second detecting point can determine according to the volatilizes of liquid coolant, interval time etc., user also can as required setting example as the 3rd detecting point etc., to carry out detection early warning in various degree to liquid level.
The rotating speed of liquid pump is controlled, if rotating speed does not change, directly compares liquid level and first and detects point, second and detect height a little.As an embodiment, when liquid level is higher than the first detecting point, detects a little corresponding liquid feeding interface end output low level with first, detect a little corresponding alarm interface end output low level with second; When liquid level not higher than the first detecting point, higher than the second detecting point time, described liquid feeding interface end exports high level, described alarm interface end output low level, prompting liquid feeding; If when liquid level is not higher than the second detecting point, described liquid feeding interface end and alarm interface end all export high level, the too low alarm of liquid level; If described liquid feeding interface end is low level, described alarm interface end is high level, and the system failure is reported to the police.Also can control whether to point out the too low alarm of liquid feeding or liquid level or the system failure to report to the police by the corresponding interface end output low level in addition.
If rotating speed changes, the liquid level of liquid coolant also can change.If reflective photoelectric switch is fixing, for the liquid of as much, when liquid pump rotating speed is slower, liquid level rising is less, if now liquid level detects point lower than the first detecting o'clock higher than second; What when the rotating speed of liquid pump is very fast, liquid level raised is more, and now liquid level is just likely higher than two detecting points, the liquid of as much due to the different testing results of liquid pump rotating speed will be different, make correctly to judge that the liquid feeding time becomes difficulty.So described level sensing platelet will be moved according to the change of rotating speed, the first detecting point making reflective photoelectric switch corresponding new, the new second detecting point, and then compare again.
Determine that the displacement of level sensing platelet movement can have multiple implementation method during the change of step S120 medium speed, such as, as an embodiment, determine that the step of level sensing platelet moving displacement comprises:
If current fluid level, higher than described first detecting point, determines described level sensing platelet moving displacement H1 according to formula H1=K1*V1; Wherein K1 is the liquid level change and rotation speed change coefficient of relationship determined, and V1 is rotation speed change;
If current fluid level higher than described second detecting point, determines described level sensing platelet moving displacement H2 according to formula H2=K2*V2 lower than described first detecting point; Wherein K2 is the liquid level change and rotation speed change coefficient of relationship determined, and V2 is rotation speed change.
Wherein determine COEFFICIENT K 1, the step of K2 comprises: some liquid level change time different according to the rotating speed measured, adopt formula liquid level change/rotation speed change determination COEFFICIENT K 1, K2, certain point wherein said is other point except detecting except the first detecting point and second.
How many meetings due to liquid coolant have influence on the relation of liquid level change and rotation speed change, so liquid level changes the coefficient of relationship with rotation speed change when needing to measure liquid level differing heights.The type of liquid coolant and the size etc. of cooling tank also can have influence on the relation of liquid level change and rotation speed change simultaneously, so need the coefficient of relationship remeasured between the two for dissimilar projector.
How concrete mobile level sensing platelet during for the ease of understanding rotation speed change, elaborates below in conjunction with accompanying drawing 3.
As shown in Figure 3, the movement controlling level sensing platelet comprises step:
S122, judge whether the rotation speed change V of liquid pump equals 0, if return step S122, if not, enters step S123;
S123, judge current fluid level whether higher than the first detecting point, current fluid level refers to the liquid level before rotation speed change, first detecting point refers to the first detecting point before rotation speed change, if enter step S124, enter step S127 if not, the condition entering step S127 mainly refers to current fluid level here lower than the first detecting point, higher than the second detecting point;
S124, judge whether rotation speed change V is greater than 0, if enter step S125, enter step S126 if not;
S125, level sensing platelet moved up H1, H1 be current fluid level higher than the moving displacement determined during described first detecting point, enter step S122;
S126, level sensing platelet is moved down H1, H1 be current fluid level higher than the moving displacement determined during described first detecting point, enter step S122;
S127, judge whether rotation speed change V is greater than 0, if enter step S128, enter step S129 if not;
S128, level sensing platelet moved up H2, H2 be current fluid level higher than the moving displacement determined during described first detecting point, enter step S122;
S129, level sensing platelet is moved down H2, H2 be current fluid level higher than the moving displacement determined during described first detecting point, enter step S122.
As an embodiment, the movement of level sensing platelet can be controlled by motor driver Driving Stepping Motor, level sensing platelet can accurately be located.
As an embodiment, after showing the step of liquid feeding information in step S130, the step of record liquid feeding prompt time can also be comprised; After the step of display alarm information, the step of record alarm time can also be comprised;
If the liquid feeding prompt time of record and alarm time difference are less than the default time, display leakage warning information.The liquid feeding prompt time of record and alarm time can be time when showing the earliest, and the default time can be the random time putting the time used when being less than no leakage from the first detecting point to the second detecting, such as 20 hours etc.
Reflective photoelectric switch is subject to the impact of liquid pump PWM (Pulse Width Modulation, pulse-length modulation) signal, produces with PWM with spike frequently.Such as, in present system, liquid pump pwm signal frequency is 200Hz, and the width of so spike is approximately 200us.When opening refrigeration system, because refrigeration system electric current is larger, metal-oxide-semiconductor (Metal-Oxid-Semiconductor, metal-oxide semiconductor fieldeffect transistor) gauge tap creates larger interference, cause power supply unstable, exist with disturbing pulse frequently, reflective photoelectric switch exports exists certain interference.Because the spike duration is not long, the method head it off of software filtering can be adopted.As an embodiment, the described comparative result can sampled according to continuous preset times determines whether to show corresponding liquid feeding information, warning information, such as to described liquid feeding interface end and alarm interface end, every 1ms, sampling should be carried out, and the constant judgement sampling of continuous 6 sampled values effectively.
Liquid feeding information can show in the mode of pilot lamp, also can point out in the mode of alarm.Due to liquid level from first detecting point to second detecting put the time longer, if never liquid feeding, liquid feeding information frequently shows, the situation of especially always reporting to the police, interference is caused to surrounding, the method head it off controlling liquid feeding prompting displaying time can be adopted.As an embodiment, liquid feeding information can at Preset Time or at system boot time or interval Preset Time show within a certain period of time.Such as liquid feeding information can in the set time of every day, as 10 displays; Also can within a certain period of time, such as, show in 1 minute, then certain interval of time, as 5 hours, then display etc.
Based on same inventive concept, present invention also offers a kind of projector liquid cooling system liquid feeding and alarm time determining device, be described in detail below in conjunction with the embodiment of accompanying drawing to apparatus of the present invention.
As shown in Figure 4, Figure 5, a kind of projector liquid cooling system liquid feeding and alarm time determining device, comprising:
Be fixed on the vertical movement track 100 of tank for coolant 300 outer wall, if liquid pump rotating speed changes, level sensing platelet 200 moves at described vertical movement track 100 according to the displacement determined, obtains new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding;
Be arranged on the level sensing platelet 200 of described vertical movement track 100, comprise reflective photoelectric switch, differential comparator 203, the first detecting point that one of them reflective photoelectric switch 201 is preset under being positioned at the current rotating speed of liquid pump, another reflective photoelectric switch 202 is positioned at the preset second detecting point lower than described first detecting point, described differential comparator 203 is detected point, new second detect height a little for being compared liquid level and new first, determines whether to show corresponding liquid feeding information, warning information according to the result compared; When liquid pump rotating speed does not change, described differential comparator 203 is detected point, second detect height a little for being compared liquid level and first, determines whether to show corresponding liquid feeding information, warning information according to the result compared.
Owing to being provided with two detecting points, the present invention's differential comparator 203 used is double passage differential comparer, and for comparing separately, liquid level and first detects height a little, liquid level and second detects height a little.Differential comparator can select different port numbers according to the comparison item number arranged.
When liquid pump rotating speed changes, the height of liquid level is vertical change, and vertical movement track 100 can make described level sensing platelet 200 move vertically, ensures the accuracy of level sensing.Tracks also can be tilt, but after level sensing platelet 200 moves, reflective photoelectric switch likely can not detect liquid surface level due to Angulation changes, or the liquid level detected is not actual liquid level, and the degree of accuracy of level sensing is lower.Simultaneously because the front end face of reflective photoelectric switch needs to remain in specialized range with reflector, as a preferred embodiment, reflective photoelectric switch should against cooling tank wall as far as possible, ensures the sensitivity of detection.Reflective photoelectric switch also can replace with other functionally similar level switches.Can for the first detecting point, the second detecting point determined when rotating speed is 0 under current rotating speed, the first detecting point determined when also can be a concrete rotating speed, the second detecting point.Wherein first detecting point, second detecting point can determine according to the volatilizes of liquid coolant, interval time etc., user also can as required setting example as the 3rd detecting point etc., to carry out detection early warning in various degree to liquid level.
The rotating speed of liquid pump is controlled, if rotating speed does not change, directly compares liquid level and first and detects point, second and detect height a little.As an embodiment, when liquid level is higher than the first detecting point, detects a little corresponding liquid feeding interface end 500 output low level with first, detect a little corresponding alarm interface end 500 output low level with second; When liquid level not higher than first detecting point, higher than second detecting point time, described liquid feeding interface end 500 exports high level, described alarm interface end 500 output low level, prompting liquid feeding; If when liquid level is not higher than the second detecting point, described liquid feeding interface end 500 all exports high level, the too low alarm of liquid level with alarm interface end 500; If described liquid feeding interface end 500 is low level, described alarm interface end 500 is high level, and the system failure is reported to the police.Also can control whether to point out the too low alarm of liquid feeding or liquid level or the system failure to report to the police by the corresponding interface end output low level in addition.
If rotating speed changes, the liquid level of liquid coolant also can change.If reflective photoelectric switch is fixing, for the liquid of as much, when liquid pump rotating speed is slower, liquid level rising is less, if now liquid level detects point lower than the first detecting o'clock higher than second; What when the rotating speed of liquid pump is very fast, liquid level raised is more, and now liquid level is just likely higher than two detecting points, the liquid of as much due to the different testing results of liquid pump rotating speed will be different, make correctly to judge that the liquid feeding time becomes difficulty.So described level sensing platelet will be moved according to the change of rotating speed, the first detecting point making reflective photoelectric switch corresponding new, the new second detecting point, and then compare again.
Determine during rotation speed change that the displacement of level sensing platelet 200 movement can have multiple way of realization, such as, as an embodiment, if current fluid level, higher than described first detecting point, determines the moving displacement H1 of described level sensing platelet 200 on described vertical movement track 100 according to formula H1=K1*V1; Wherein K1 is the liquid level change and rotation speed change coefficient of relationship determined, and V1 is rotation speed change;
If current fluid level higher than described second detecting point, determines described level sensing platelet 200 moving displacement H2 on described vertical movement track 100 according to formula H2=K2*V2 lower than described first detecting point; Wherein K2 is the liquid level change and rotation speed change coefficient of relationship determined, and V2 is rotation speed change;
Wherein according to the change of the rotating speed measured some liquid level of different time, adopt formula liquid level change/rotation speed change determination COEFFICIENT K 1, K2, certain point wherein said is other point except the first detecting point and the second detecting point.
How many meetings due to liquid coolant have influence on the relation of liquid level change and rotation speed change, so liquid level changes the coefficient of relationship with rotation speed change when needing to measure liquid level differing heights.The type of liquid coolant and the size etc. of cooling tank also can have influence on the relation of liquid level change and rotation speed change simultaneously, so need the coefficient of relationship remeasured between the two for dissimilar projector.
As an embodiment, as shown in Figure 4, the movement of level sensing platelet 200 can be controlled by motor driver Driving Stepping Motor 400, level sensing platelet 200 can accurately be located.
As an embodiment, projector's liquid cooling system liquid feeding and alarm time determining device can also comprise time regulator, after described differential comparator 203 determines display liquid feeding information or warning information, for recording liquid feeding prompt time or alarm time;
If the liquid feeding prompt time of time regulator record and alarm time difference are less than the default time, display leakage warning information.
The liquid feeding prompt time of time regulator record and alarm time can be time when showing the earliest, and the default time can be the random time putting the time used when being less than no leakage from the first detecting point to the second detecting, such as 20 hours etc.
Reflective photoelectric switch is subject to the impact of liquid pump PWM (Pulse Width Modulation, pulse-length modulation) signal, produces with PWM with spike frequently.Such as, in present system, liquid pump pwm signal frequency is 200Hz, and the width of so spike is approximately 200us.When opening refrigeration system, because refrigeration system electric current is larger, metal-oxide-semiconductor (Metal-Oxid-Semiconductor, metal-oxide semiconductor fieldeffect transistor) gauge tap creates larger interference, cause power supply unstable, exist with disturbing pulse frequently, reflective photoelectric switch exports exists certain interference.Because the spike duration is not long, the method head it off of software filtering can be adopted.As an embodiment, the described comparative result that described differential comparator 203 can be sampled according to continuous preset times determines whether to show corresponding liquid feeding information, warning information, such as to described liquid feeding interface end and alarm interface end, every 1ms, sampling should be carried out, and the constant judgement sampling of continuous 6 sampled values effectively.
Liquid feeding information can show in the mode of pilot lamp, also can point out in the mode of alarm.Due to liquid level from first detecting point to second detecting put the time longer, if never liquid feeding, liquid feeding information frequently shows, the situation of especially always reporting to the police, interference is caused to surrounding, the method head it off controlling liquid feeding prompting displaying time can be adopted.As an embodiment, liquid feeding information can at Preset Time or at system boot time or interval Preset Time show within a certain period of time.Such as liquid feeding information can in the set time of every day, as 10 displays; Also can within a certain period of time, such as, show in 1 minute, then certain interval of time, as 5 hours, then display etc.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. projector's liquid cooling system liquid feeding and an alarm time defining method, is characterized in that, comprise step:
The the first detecting point preset under one of them reflective photoelectric switch of level sensing platelet being placed in the current rotating speed of liquid pump, another reflective photoelectric switch is placed in the second default detecting point, and described second detecting point is lower than described first detecting point;
If liquid pump rotating speed does not change, compare liquid level and first and detect point, second and detect height a little, determine whether to show corresponding liquid feeding information, warning information according to the result compared;
If liquid pump rotating speed changes, level sensing platelet is moved according to the displacement determined, obtain new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding;
Relatively liquid level and new first detect point, new second and is detected height a little, determines whether liquid feeding information, the warning information of display correspondence according to the result compared.
2. projector according to claim 1 liquid cooling system liquid feeding and alarm time defining method, it is characterized in that, determine that the step of level sensing platelet moving displacement comprises: if current fluid level is higher than described first detecting point, determine described level sensing platelet moving displacement H1 according to formula H1=K1*V1; Wherein K1 is the liquid level change and rotation speed change coefficient of relationship determined, and V1 is rotation speed change;
If current fluid level higher than described second detecting point, determines described level sensing platelet moving displacement H2 according to formula H2=K2*V2 lower than described first detecting point; Wherein K2 is the liquid level change and rotation speed change coefficient of relationship determined, and V2 is rotation speed change;
Determine COEFFICIENT K 1, the step of K2 comprises: some liquid level change time different according to the rotating speed measured, adopt formula liquid level change/rotation speed change determination COEFFICIENT K 1, K2, certain point wherein said is other point except detecting except the first detecting point and second.
3. projector according to claim 1 liquid cooling system liquid feeding and alarm time defining method, is characterized in that, after the step of display liquid feeding information, also comprises the step of record liquid feeding prompt time; After the step of display alarm information, also comprise the step of record alarm time;
If the liquid feeding prompt time of record and alarm time difference are less than the default time, display leakage warning information.
4. projector according to claim 1 liquid cooling system liquid feeding and alarm time defining method, is characterized in that, determines whether to show corresponding liquid feeding information, warning information according to the described comparative result that continuous preset times is sampled.
5. the projector's liquid cooling system liquid feeding according to Claims 1-4 any one and alarm time defining method, is characterized in that, when liquid feeding information is at Preset Time or at system boot or interval Preset Time show within a certain period of time.
6. projector's liquid cooling system liquid feeding and an alarm time determining device, is characterized in that, comprising:
Be fixed on the vertical movement track of tank for coolant outer wall, if liquid pump rotating speed changes, level sensing platelet at described vertical movement rail moving, obtains new the first detecting point, the new second detecting point that mobile rear each reflective photoelectric switch is corresponding according to the displacement determined;
Be arranged on the level sensing platelet of described vertical movement track, comprise reflective photoelectric switch, differential comparator, the first detecting point that one of them reflective photoelectric switch is preset under being positioned at the current rotating speed of liquid pump, another reflective photoelectric switch is positioned at the preset second detecting point lower than described first detecting point, described differential comparator is detected point, new second detect height a little for being compared liquid level and new first, determines whether to show corresponding liquid feeding information, warning information according to the result compared; When liquid pump rotating speed does not change, described differential comparator is detected point, second detect height a little for being compared liquid level and first, determines whether to show corresponding liquid feeding information, warning information according to the result compared.
7. projector according to claim 6 liquid cooling system liquid feeding and alarm time determining device, it is characterized in that, if current fluid level, higher than described first detecting point, determines the moving displacement H1 of described level sensing platelet on described vertical movement track according to formula H1=K1*V1; Wherein K1 is the liquid level change and rotation speed change coefficient of relationship determined, and V1 is rotation speed change;
If current fluid level higher than described second detecting point, determines described level sensing platelet moving displacement H2 on described vertical movement track according to formula H2=K2*V2 lower than described first detecting point; Wherein K2 is the liquid level change and rotation speed change coefficient of relationship determined, and V2 is rotation speed change;
According to the change of the rotating speed measured some liquid level of different time, adopt formula liquid level change/rotation speed change determination COEFFICIENT K 1, K2, certain point wherein said is other point except the first detecting point and the second detecting point.
8. projector according to claim 6 liquid cooling system liquid feeding and alarm time determining device, it is characterized in that, also comprise time regulator, after described differential comparator determines display liquid feeding information or warning information, for recording liquid feeding prompt time or alarm time;
If the liquid feeding prompt time of time regulator record and alarm time difference are less than the default time, display leakage warning information.
9. projector according to claim 6 liquid cooling system liquid feeding and alarm time determining device, is characterized in that, described differential comparator determines whether to show corresponding liquid feeding information, warning information according to the described comparative result that continuous preset times is sampled.
10. the projector's liquid cooling system liquid feeding according to claim 6-9 any one and alarm time determining device, is characterized in that, when liquid feeding information is at Preset Time or at system boot or interval Preset Time show within a certain period of time.
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| CN105467731B (en) * | 2015-12-16 | 2017-08-01 | 深圳市帅映科技股份有限公司 | A kind of heat management system of laser projection |
| CN110836710B (en) * | 2018-08-15 | 2021-06-18 | 北汽福田汽车股份有限公司 | Cooling liquid level detection method and device and vehicle |
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| DE19833766A1 (en) * | 1998-07-17 | 2000-01-20 | Ism Ingenieurbuero Fuer Spezia | Optical fluid level sensor for fluid in container |
| JP2004333757A (en) * | 2003-05-06 | 2004-11-25 | Seiko Epson Corp | Light source device and projection display apparatus using the same |
| CN202793526U (en) * | 2012-08-15 | 2013-03-13 | 柳州 | Liquid level sensing device and electrical equipment with water tank |
| CN102829844A (en) * | 2012-08-28 | 2012-12-19 | 天津炫盛科技开发有限公司 | Coolant liquid level alarm device |
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