WO2017186041A1 - 投影仪和及其散热控制方法 - Google Patents

投影仪和及其散热控制方法 Download PDF

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Publication number
WO2017186041A1
WO2017186041A1 PCT/CN2017/081117 CN2017081117W WO2017186041A1 WO 2017186041 A1 WO2017186041 A1 WO 2017186041A1 CN 2017081117 W CN2017081117 W CN 2017081117W WO 2017186041 A1 WO2017186041 A1 WO 2017186041A1
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WO
WIPO (PCT)
Prior art keywords
temperature
projector
temperature sensor
heat source
air duct
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PCT/CN2017/081117
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English (en)
French (fr)
Inventor
张正德
李屹
Original Assignee
深圳市光峰光电技术有限公司
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Application filed by 深圳市光峰光电技术有限公司 filed Critical 深圳市光峰光电技术有限公司
Publication of WO2017186041A1 publication Critical patent/WO2017186041A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating

Definitions

  • the present invention relates to the field of projection technology, and in particular, to a projector and a heat dissipation control method thereof.
  • the heat dissipation method of the projector generally sets a fan in the air duct, and the air flows through the fan.
  • the components of the projector such as a light source, a display screen, a power source, a processor, etc., dissipate heat into the air through air convection.
  • the main object of the present invention is to provide a projector aimed at improving the service life of the projector and reducing the damage rate of components.
  • a projector includes a housing in which a duct is formed, and an air inlet cover of the air duct is provided with a dustproof member, and a first temperature sensor is disposed in the air duct. a second temperature sensor disposed adjacent to the air inlet of the air duct, the fixed heat source being disposed away from the air inlet, and the second temperature sensor being disposed adjacent to the fixed heat source;
  • the projector is further provided with a processor, the processor is electrically connected to the first temperature sensor and the second temperature sensor, and the processor detects the first temperature and the first temperature sensor The temperature difference of the second temperature detected by the second temperature sensor is compared with a preset threshold. If the temperature difference is greater than a preset threshold, the component usage power of the projector is reduced.
  • the first temperature sensor is configured to detect a first temperature of the environment in the air channel, and send the first temperature to the processor;
  • a second temperature of the second temperature sensor for detecting the fixed heat source and transmitting the second temperature to the processor.
  • a fixing plate is disposed in the air duct, and the first temperature sensor, the second temperature sensor, and the fixed heat source are mounted on the fixing plate.
  • the fixed heat source is a semiconductor heating element.
  • the second temperature of the fixed heat source is higher than the first temperature in the air duct.
  • the fixed heat source uses a fixed power.
  • the projector is further provided with an alarm device, and the alarm device is electrically connected to the processor, and is configured to generate the warning information when the temperature difference is greater than a preset threshold.
  • the projector is further provided with a wireless communication device, and the wireless communication device is wirelessly connected to the mobile control terminal, configured to receive a control signal of the mobile control terminal and/or send the warning information to the Mobile control terminal.
  • the wireless communication device is wirelessly connected to the mobile control terminal, configured to receive a control signal of the mobile control terminal and/or send the warning information to the Mobile control terminal.
  • the invention also provides a heat dissipation control method for a projector, comprising:
  • the method before the step of acquiring the first temperature of the intake air in the air duct and the second temperature of fixing the heat source in the air duct, the method further includes: setting a start time and an interval time of the detection.
  • the airflow entering the air duct through the dustproof member can take away a part of the heat of the fixed heat source, so that the temperature of the fixed heat source is lowered; if the ventilation hole/ventilation passage of the dustproof component is unblocked and not blocked, the gas entering the air passage is entered.
  • the flow rate is large, the heat that is taken away by the fixed heat source is large, and the temperature at which the fixed heat source is lowered is also large; and if the ventilating hole/ventilation passage of the dustproof member is blocked, the flow of air entering the air passage becomes small, and the fixed heat source is taken away.
  • the amount of heat is also reduced, and the temperature of the fixed heat source is increased, so that the temperature difference between the temperature of the fixed heat source and the temperature of the air flow rises relative to the case where the vent/ventilation passage of the dustproof member is not blocked.
  • the first temperature T1 of the wind entering the air duct is obtained by the first temperature sensor
  • the second temperature T2 of the fixed heat source in the air channel is obtained by the second temperature sensor
  • the processor sets the first temperature T1 and the second temperature T2.
  • the temperature difference is compared with a preset threshold.
  • the processor controls the operation of the projector, specifically, reduces the power of the components to reduce the heat source of the projector, thereby reducing the temperature of the projector, extending the life of the projector, and reducing the damage rate of components.
  • FIG. 1 is a partial schematic view of an embodiment of a projector according to the present invention.
  • FIG. 2 is a flow chart of an embodiment of a heat dissipation control method for a projector of the present invention.
  • the directional indications (such as up, down, left, right, front, back, ...) are only used to explain between components in a certain posture (as shown in the drawing). The relative positional relationship, the motion situation, and the like, if the specific posture changes, the directional indication also changes accordingly.
  • first, second, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the present invention provides a projector 100.
  • a projector 100 includes a housing (not shown).
  • a air duct 10 is formed in the housing.
  • the air inlet 11 of the air duct 10 is covered with a dustproof member 20 .
  • a first temperature sensor 30, a second temperature sensor 40, and a fixed heat source 50 are disposed in the air duct 10, and the first temperature sensor 30 is disposed near the air inlet 11 of the air duct 10, and the fixed heat source 50 is away from the air source.
  • the air inlet 11 is disposed, and the second temperature sensor 40 is disposed adjacent to the fixed heat source 50.
  • the projector 100 is further provided with a processor (not shown), the processor is electrically connected to the first temperature sensor 30 and the second temperature sensor 40, and the processor sets the first temperature The temperature difference between the first temperature T1 detected by the sensor 30 and the second temperature T2 detected by the second temperature sensor 40 is compared with a preset threshold, and if the temperature distance is greater than a preset threshold, the component power of the projector 100 is lowered. .
  • the dust-proof member 20 can be a dust-proof net.
  • other dust-proof structures for preventing dust from entering the air duct 10 can be used, which are all within the protection scope of the present invention.
  • the fixed heat source 50 has a heat generation temperature that is not the same as the second temperature T2 detected by the second temperature sensor 40.
  • the fixed heat source 50 uses a fixed power, so the heat generation temperature is a fixed temperature.
  • the environmental factors such as wind speed, temperature
  • the fixed heat source 50 generates heat to maintain its own temperature constant (understandably The longer the heating time of the fixed heat source 50 is, the higher the heating temperature will be, but the increase is small, which has little effect on the temperature of the fixed heat source of the present application (ie, the second temperature T2).
  • the heating temperature does not change, but the second temperature T2 changes.
  • the airflow entering the air passage through the dustproof member 20 can carry away a part of the heat of the fixed heat source 50, so that the second temperature T2 of the fixed heat source 50 is lowered. If the ventilation hole/ventilation passage of the dustproof member 20 is unblocked and not blocked, the air flow entering the air passage 10 is large, the heat that the fixed heat source 50 is taken away is large, and the second temperature T2 of the fixed heat source 50 is decreased.
  • the vent hole/ventilation passage of the dustproof member 20 If the vent hole/ventilation passage of the dustproof member 20 is clogged, the flow rate of air entering the air passage 10 becomes small, and the amount of heat taken away by the fixed heat source 50 is also reduced, and the second temperature of the fixed heat source 50 is fixed.
  • the temperature of T2 will rise so that the temperature difference between the second temperature of the fixed heat source 50 and the first temperature T2 (ie, the temperature of the air flow) in the air duct 10 will be different with respect to the vent/vent passage of the dust-proof member 20. rise.
  • the semiconductor heating element can accurately control the heating temperature, and the temperature of the fixed heat source 50 can be adjusted according to the actual ambient temperature.
  • the housing of the projector 100 is provided with a plurality of components, such as a light source, a display screen, a power source, a processor, and the like.
  • Component work requires heat, and when the power of the work is high, the heat generated by the components is greater. The emitted heat is carried away by the flow of air in the duct 10 to lower the temperature of the component itself.
  • the technical solution of the present invention acquires the first temperature T1 of the wind entering the air duct 10 through the first temperature sensor 30, and acquires the second temperature T2 of the fixed heat source 50 in the air duct 10 through the second temperature sensor 40, and the processor sets the first temperature.
  • the temperature difference ⁇ T between the T1 and the second temperature T2 is compared with a preset threshold. When the temperature difference is greater than the preset threshold, it is proved that the wind entering the air duct 10 is insufficient, thereby estimating that the dust of the dustproof member 20 is excessive. The air inlet of the air duct 10 is blocked.
  • the preset threshold and the power of the fixed heat source 50 can be set according to actual conditions.
  • the ambient temperature (first temperature) T1 is 30 ° C
  • the second temperature T2 of the fixed heat source 50 in the case where the wind power is sufficient is 45 ° C
  • the threshold value can be set to 15 ° C.
  • the temperature difference is less than 15 ° C, the dustproof member 20 is clogged.
  • the temperature of the fixed heat source 50 is higher than the air temperature
  • the threshold is set between 4 ° C and 6 ° C, and optimally, the threshold is 5 ° C.
  • the temperature difference ⁇ T>5° C. it is determined that the dust of the dust-proof member 20 is excessive.
  • the processor controls the operation of the projector 100, specifically, reduces the power of the component to reduce the heat source of the projector 100, thereby reducing the temperature of the projector 100, extending the service life of the projector 100, and reducing the components. Failure rate.
  • the first temperature sensor 30 and the second temperature sensor 40 are arranged in the same air duct 10, it is possible to accurately detect the clogging of the dust-proof member 20. It is also possible to avoid placing too many structures in the projector 100.
  • the air duct for setting the air filter net is divided into two channels, a wind wheel is disposed in the first channel, and a barrier layer is disposed in the second channel.
  • a temperature sensor located outside the air duct
  • another temperature sensor is disposed at the barrier layer.
  • the heating temperature of the heating element of the projector itself has a great influence on the detection temperature at the barrier layer, making the detection result inaccurate and easy to be mistaken. Judging the blockage of the air filter.
  • the fixed heat source 50 in the present application eliminates the influence of the heat of the projector 100 itself on the temperature difference, thereby making it more accurate.
  • the two channels are arranged so that the internal structure of the projector 100 is complicated, the size is increased, and it is not convenient to carry and use.
  • the projector 100 provided by the present invention can accurately detect the use condition of the dustproof component, and has a simple structure, improves the service life of the projector, and reduces the damage rate of the component.
  • a fixing plate 60 is disposed in the air duct 10 , and the first temperature sensor 30 , the second temperature sensor 40 , and the fixed heat source 50 are mounted on the fixing plate 60 .
  • the installation of the first temperature sensor 30, the second temperature sensor 40, and the fixed heat source 50 is relatively stable, and is convenient for disassembly and maintenance.
  • the projector 100 is further provided with an alarm device (not shown), and the alarm device is electrically connected to the processor, and is configured to generate warning information when the temperature difference is greater than a preset threshold. .
  • the warning information may be sound information, such as alerting or voice alarming, reminding the user that the dust of the dustproof component 20 is excessive, and should be cleaned in time, or alarmed by text information, such as displayed on the display panel of the projector 100. Information that is too dusty to alert the user.
  • the projector 100 is further provided with a wireless communication device (not shown), and the wireless communication device is wirelessly connected to the mobile control terminal for receiving a control signal of the mobile control terminal and/or the warning Information is sent to the mobile control terminal.
  • the wireless communication device can be a radio frequency device, an infrared transmission device, a Bluetooth transmission device, a WIFI transmission device, or the like.
  • the mobile control terminal is wirelessly connected to the projector 100, and the projector 100 can be conveniently controlled by the mobile control terminal.
  • the mobile control terminal can be a remote controller, a smart phone or a tablet computer.
  • the warning information can also be transmitted to the mobile control terminal through the wireless communication device.
  • the present invention further provides a heat dissipation control method for the projector 100, including:
  • Step S10 acquiring a first temperature in the air duct 10 after entering the air and a second temperature fixing the heat source 50 in the air duct 10;
  • Step S20 determining whether the temperature difference between the second temperature and the first temperature is greater than a preset threshold, and if greater than the preset threshold, reducing the component usage power of the projector 100.
  • the technical solution of the present invention obtains the temperature difference ⁇ T between the first temperature T1 and the second temperature T2 by acquiring the first temperature T1 of the wind entering the air duct 10 and acquiring the second temperature T2 of the heat source 50 in the air duct 10. Compared with the preset threshold, when the temperature difference is greater than the preset threshold, it is proved that the wind entering the air duct 10 is insufficient, and the dust of the dustproof member 20 is excessively estimated to block the air inlet of the air duct 10.
  • the preset threshold can be set according to actual conditions.
  • the temperature of the fixed heat source 50 is greater than the air temperature
  • the threshold is set between 4 ° C and 6 ° C, and optimally, the threshold is 5 ° C.
  • the temperature difference ⁇ T>5° C. it is determined that the dust of the dust-proof member 20 is excessive.
  • the power of the component is lowered to lower the heat source of the projector 100, thereby lowering the temperature of the projector 100, prolonging the service life of the projector 100, and reducing the damage rate of the component.
  • the method before step S10, the method further includes: setting a start time and an interval time of the detection.
  • a start time is set before the test.
  • the first detection is performed at the start time, and it is judged by the first detection result whether or not the dust-proof member 20 at the time is clogged. Then, when the interval time arrives, for example, 12 hours is the interval time, the detection is performed again after 12 hours of the start time. In this way, the purpose of intelligent monitoring can be achieved.
  • step S20 the method further includes:
  • An alarm signal is sent to the alarm device, which generates a warning message.
  • the warning information may be sound information, such as alerting or voice alarming, reminding the user that the dust of the dustproof component 20 is excessive, and should be cleaned in time, or alarmed by text information, such as displayed on the display panel of the projector 100. Information that is too dusty to alert the user.

Abstract

一种投影仪（100）和投影仪（100）的散热控制方法，其中，投影仪（100）包括壳体，壳体内形成有风道（10），风道（10）的进风口（11）罩设有防尘部件（20），风道（10）内设有第一温度传感器（30）、第二温度传感器（40）以及固定热源（50），第一温度传感器（30）靠近风道（10）的进风口（11）设置，固定热源（50）远离进风口（11）设置，第二温度传感器（40）邻接固定热源（50）设置；投影仪（100）还设有处理器，处理器与第一温度传感器（30）、第二温度传感器（40）电性连接，处理器将第一温度传感器（30）检测到的第一温度和第二温度传感器（30，40）检测到的第二温度的温差与预设阈值比较，若温差大于预设阈值，则降低投影仪（100）的元器件使用功率。如此，可提高投影仪（100）的使用寿命，降低元器件的损坏率。

Description

投影仪和及其散热控制方法 技术领域
本发明涉及投影技术领域，特别涉及一种投影仪及其散热控制方法。
 背景技术
投影仪的散热方式，一般都是在风道内设置风扇，通过风扇吹动空气流动，投影仪的元器件如光源、显示屏、电源、处理器等，通过空气对流将热量散发到空气中。
 技术问题
现在为了防止空气中的灰尘，通常在风道的入口处加设防尘部件。然而，如此会存在以下问题：随着使用时间的推移，防尘部件上的灰尘聚集越来越多，导致进入到风道内的空气越来越少，散热效果变差，投影仪内的发热体散热变差后寿命缩短，甚至直接损坏元器件。
 技术解决方案
本发明的主要目的是提供一种投影仪，旨在提高投影仪的使用寿命，降低元器件的损坏率。
为实现上述目的，本发明提出的投影仪，包括壳体，所述壳体内形成有风道，所述风道的进风口罩设有防尘部件，所述风道内设有第一温度传感器、第二温度传感器以及固定热源，所述第一温度传感器靠近所述风道的进风口设置，所述固定热源远离所述进风口设置，所述第二温度传感器邻接所述固定热源设置；
所述投影仪还设有处理器，所述处理器与所述第一温度传感器、所述第二温度传感器电性连接，所述处理器将所述第一温度传感器检测到的第一温度和所述第二温度传感器检测到的第二温度的温差与预设阈值比较，若温差大于预设阈值，则降低投影仪的元器件使用功率。
可选地，所述第一温度传感器用于检测所述风道内环境的第一温度，并将该第一温度发送至所述处理器；
所述第二温度传感器的用于检测所述固定热源的第二温度，并将该第二温度发送至所述处理器。
可选地，所述风道内设有固定板，第一温度传感器、第二温度传感器以及固定热源安装于所述固定板。
可选地，所述固定热源为半导体发热元件。
可选地，所述固定热源的第二温度高于所述风道内的第一温度。
可选地，所述固定热源采用固定功率。
可选地，所述投影仪还设有报警装置，所述报警装置与所述处理器电性连接，用于在所述温差大于预设阈值时，产生警示信息。
可选地，所述投影仪还设有无线通讯装置，所述无线通讯装置与移动控制终端无线连接，用于接收所述移动控制终端的控制信号和/或将所述警示信息发送至所述移动控制终端。
本发明还提供一种投影仪的散热控制方法，包括：
获取进风后风道内的第一温度和风道内固定热源的第二温度；
判断第二温度与第一温度的温差是否大于预设阈值，若大于预设阈值，则降低投影仪的元器件使用功率。
可选地，在获取风道内的进风第一温度和风道内固定热源的第二温度的步骤前，还包括：设置检测的起始时间和间隔时间。
 有益效果
通过防尘部件进入到风道的气流可以带走固定热源的一部分热量，使得固定热源的温度降低；若防尘部件的通风孔/通风通道是畅通而没有堵塞的，则进入到风道中的气流量较大，固定热源被带走的热量多，固定热源下降的温度也大；而若防尘部件的通风孔/通风通道发生堵塞，进入到风道中的气流量变小，固定热源被带走的热量也变少，固定热源的温度会升高，从而相对于防尘部件的通风孔/通风通道没有堵塞的情况，固定热源的温度与气流温度的温差会上升。本发明技术方案通过第一温度传感器获取进入风道后的风的第一温度T1，通过第二温度传感器获取风道内固定热源的第二温度T2，处理器将第一温度T1和第二温度T2的温差与预设的阈值进行比较，当该温差大于预设阈值时，证明进入到风道内的风力不够，进而推算出防尘部件的灰尘过多而堵塞风道的入风口。处理器进而控制投影仪的运行，具体的，降低元器件的功率，以降低投影仪的发热源，从而降低投影仪的温度，延长投影仪的使用寿命，降低元器件的损坏率。
 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本发明投影仪一实施例的部分示意图；
图2为本发明投影仪的散热控制方法一实施例的流程图。
附图标号说明：
标号 名称 标号 名称
100 投影仪 30 第一温度传感器
10 风道 40 第二温度传感器
11 进风口 50 固定热源
20 防尘部件 60 固定板
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
本发明的最佳实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，本发明实施例中如涉及方向性指示（诸如上、下、左、右、前、后……）仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种投影仪100。
请参照图1，本发明一实施例的投影仪100包括壳体（未图示），所述壳体内形成有风道10，所述风道10的进风口11罩设有防尘部件20，所述风道10内设有第一温度传感器30、第二温度传感器40以及固定热源50，所述第一温度传感器30靠近所述风道10的进风口11设置，所述固定热源50远离所述进风口11设置，所述第二温度传感器40邻接所述固定热源50设置。
所述投影仪100还设有处理器（未图示），所述处理器与所述第一温度传感器30、所述第二温度传感器40电性连接，所述处理器将所述第一温度传感器30检测到的第一温度T1和所述第二温度传感器40检测到的第二温度T2的温差与预设阈值比较，若温度距大于预设阈值，则降低投影仪100的元器件使用功率。
其中，防尘部件20可采用防尘网，当然还可以采用其他阻止粉尘进入到风道10内的防尘结构，均在本发明的保护范围内。
固定热源50具有发热温度，其与第二温度传感器40检测到的第二温度T2并不相同。一般的，固定热源50采用固定功率，因此其发热温度为固定温度。在能够引起固定热源50的温度（即为第二温度T2）发生变化的环境因素（例如风速、气温）不变的情况下，固定热源50发热以维持自身的温度稳定不变（可以理解的是，固定热源50发热时间越长，发热温度会略微升高，但其升高幅度很小，对本申请的固定热源的温度（即为第二温度T2）影响不大）。当外界环境（例如风速、气温）发生变化时，发热温度不会发生变化，但第二温度T2会发生变化。通过防尘部件20进入到风道的气流可以带走固定热源50的一部分热量，使得固定热源50的第二温度T2降低。若防尘部件20的通风孔/通风通道是畅通而没有堵塞的，则进入到风道10中的气流量较大，固定热源50被带走的热量多，固定热源50的第二温度T2下降的温度也大；而若防尘部件20的通风孔/通风通道发生堵塞，进入到风道10中的气流量变小，固定热源50被带走的热量也变少，固定热源50的第二温度T2温度会升高，从而相对于防尘部件20的通风孔/通风通道没有堵塞的情况，固定热源50的第二温度与风道10内的第一温度T2（也即气流温度）的温差会上升。
采用半导体发热元件可精确控制发热温度，方便根据实际环境温度调节该固定热源50的温度。
一般的，投影仪100的壳体内装设有很多元器件，如：光源、显示屏、电源、处理器等。元器件工作需要发热，当工作的功率较高时，元器件的发热量越大。而散发的热量因风道10内的空气流动而带走，以使元器件本身的温度降低。
本发明技术方案通过第一温度传感器30获取进入风道10后的风的第一温度T1，通过第二温度传感器40获取风道10内固定热源50的第二温度T2，处理器将第一温度T1和第二温度T2的温差△T与预设的阈值进行比较，当该温差大于预设阈值时，证明进入到风道10内的风力不够，进而推算出防尘部件20的灰尘过多而堵塞风道10的入风口。
可以理解的是，该预设阈值和固定热源50的功率可根据实际情况设定。例如，环境温度（第一温度）T1为30℃，固定热源50的在风力足够的情况下的第二温度T2为45℃，则阈值可设为15℃。当温差小于15℃时，说明防尘部件20堵塞。
在一实施例中，固定热源50的温度高于空气温度，阈值设定在4℃-6℃之间，最优的，阈值为5℃。当温差△T>5℃时，判定防尘部件20的灰尘过多。
此时，处理器控制投影仪100的运行，具体的，降低元器件的功率，以降低投影仪100的发热源，从而降低投影仪100的温度，延长投影仪100的使用寿命，降低元器件的损坏率。
如此，可通过将第一温度传感器30和第二温度传感器40设置在同一风道10内，既可精确检测防尘部件20的堵塞情况。又可避免在投影仪100内设置过多结构。
如，避免设置两个风道10来进行检测和散热，具体的，设置防尘网的风道被分割为两个通道，第一通道内设置风轮，第二通道内设置阻隔层。在防尘网上设置一温度传感器（位于风道外），阻隔层处设置另一温度传感器。防尘网未堵塞时，风一般从第一通道通过，当防尘网堵塞时，一部分风会分流到第二通道。对防尘网和阻隔层的温度进行检测，根据两者之间的温差判断防尘网是否堵塞，利用阻隔层的温度可随防尘网堵塞情况产生变化。然而，设置两个通道，通过两个通道之间的温差进行检测堵塞情况，投影仪本身的发热元件的发热温度对阻隔层处的检测温度会有很大影响，使检测结果不精确，容易误判防尘网的堵塞情况。而本申请中的固定热源50，排除了投影仪100本身的发热对于温差的影响，从而更加精确。同时，设置两个通道使得投影仪100内部结构复杂，尺寸增大，不便于携带和使用。
因而，本发明提供的投影仪100能够精确检测防尘部件的使用情况，同时结构简单，提高投影仪的使用寿命，降低元器件的损坏率。
参照图1，所述风道10内设有固定板60，第一温度传感器30、第二温度传感器40以及固定热源50安装于所述固定板60。
如此，使得第一温度传感器30、第二温度传感器40以及固定热源50的安装较为稳定，同时便于拆装和维护。
在本实施例中，所述投影仪100还设有报警装置（未图示），所述报警装置与所述处理器电性连接，用于在所述温差大于预设阈值时，产生警示信息。
当判定防尘部件20的灰尘过多时，可通过该报警装置进行报警。该警示信息可为声音信息，如发出警示音或语音进行报警，提醒用户防尘部件20的灰尘过多，应及时清理，或者通过文字信息进行报警，如在该投影仪100的显示面板上显示灰尘过多的信息以提醒用户。
进一步地，所述投影仪100还设有无线通讯装置（未图示），所述无线通讯装置与移动控制终端无线连接，用于接收所述移动控制终端的控制信号和/或将所述警示信息发送至所述移动控制终端。
该无线通讯装置可以为射频装置、红外传输装置、蓝牙传输装置、WIFI传输装置等。
如此，移动控制终端与投影仪100无线连接，通过该移动控制终端可方便控制投影仪100。该移动控制终端可为遥控器、智能手机或平板电脑等。
当判定防尘部件20的灰尘过多时，也可通过无线通讯装置将警示信息发送至移动控制终端。
参照图2，本发明还提出一种投影仪100的散热控制方法，包括：
步骤S10：获取进风后风道10内的第一温度和风道10内固定热源50的第二温度；
步骤S20：判断第二温度与第一温度的温差是否大于预设阈值，若大于预设阈值，则降低投影仪100的元器件使用功率。
本发明技术方案通过获取进入风道10后的风的第一温度T1，通过获取风道10内固定热源50的第二温度T2，处理器将第一温度T1和第二温度T2的温差△T与预设的阈值进行比较，当该温差大于预设阈值时，证明进入到风道10内的风力不够，进而推算出防尘部件20的灰尘过多而堵塞风道10的入风口。
可以理解的是，该预设阈值可根据实际情况设定。在一实施例中，固定热源50的温度大于空气温度，阈值设定在4℃-6℃之间，最优的，阈值为5℃。当温温差△T>5℃时，判定防尘部件20的灰尘过多。
此时，降低元器件的功率，以降低投影仪100的发热源，从而降低投影仪100的温度，延长投影仪100的使用寿命，降低元器件的损坏率。
本实施例中，在步骤S10前，还包括：设置检测的起始时间和间隔时间。
也即，在测试前，设置一起始时间。在该起始时间进行第一次检测，通过第一次的检测结果判断当时的防尘部件20是否堵塞。然后在间隔时间到达时，如12小时为间隔时间，则在起始时间的12小时后，再次进行检测。如此，可实现智能监控的目的。
进一步的，在步骤S20后，还包括：
发送报警信号至报警装置，该报警装置产生警示信息。
当判定防尘部件20的灰尘过多时，可通过该报警装置进行报警。该警示信息可为声音信息，如发出警示音或语音进行报警，提醒用户防尘部件20的灰尘过多，应及时清理，或者通过文字信息进行报警，如在该投影仪100的显示面板上显示灰尘过多的信息以提醒用户。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (10)

1、一种投影仪，其特征在于，包括壳体，所述壳体内形成有风道，所述风道的进风口罩设有防尘部件，所述风道内设有第一温度传感器、第二温度传感器以及固定热源，所述第一温度传感器靠近所述风道的进风口设置，所述固定热源远离所述进风口设置，所述第二温度传感器邻接所述固定热源设置；
所述投影仪还设有处理器，所述处理器与所述第一温度传感器、所述第二温度传感器电性连接，所述处理器将所述第一温度传感器检测到的第一温度和所述第二温度传感器检测到的第二温度的温差与预设阈值比较，若温差大于预设阈值，则降低投影仪的元器件使用功率。
2、如权利要求1所述的投影仪，其特征在于，所述第一温度传感器用于检测所述风道内环境的第一温度，并将该第一温度发送至所述处理器；
所述第二温度传感器的用于检测所述固定热源的第二温度，并将该第二温度发送至所述处理器。
3、如权利要求1所述的投影仪，其特征在于，所述风道内设有固定板，第一温度传感器、第二温度传感器以及固定热源安装于所述固定板。
4、如权利要求1所述的投影仪，其特征在于，所述固定热源为半导体发热元件。
5、如权利要求1所述的投影仪，其特征在于，所述固定热源的第二温度高于所述风道内的第一温度。
6、如权利要求1所述的投影仪，其特征在于，所述固定热源采用固定功率。
7、如权利要求1至6任一所述的投影仪，其特征在于，所述投影仪还设有报警装置，所述报警装置与所述处理器电性连接，用于在所述温差大于预设阈值时，产生警示信息。
8、如权利要求7所述的投影仪，其特征在于，所述投影仪还设有无线通讯装置，所述无线通讯装置与移动控制终端无线连接，用于接收所述移动控制终端的控制信号和/或将所述警示信息发送至所述移动控制终端。
9、一种投影仪的散热控制方法，其特征在于，包括：
获取进风后风道内的第一温度和风道内固定热源的第二温度；
判断第二温度与第一温度的温差是否大于预设阈值，若大于预设阈值，则降低投影仪的元器件使用功率。
10、如权利要求9所述的投影仪的散热控制方法，其特征在于，在获取风道内的进风第一温度和风道内固定热源的第二温度的步骤前，还包括：设置检测的起始时间和间隔时间。
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