CN107015426A - A kind of thermal balance heat abstractor for projecting apparatus - Google Patents

Abstract

The present invention proposes a kind of thermal balance heat abstractor for projecting apparatus; including support, thermal balance radiating subassembly and safeguard protection component; support is positive truncated rectangular pyramids framework structure; it is coated at projecting apparatus bulb; bottom and the front shroud body phase of bulb outboard end connect; thermal balance radiating subassembly is installed on four lateral frames of support respectively, and safeguard protection component is fixed on inside projecting apparatus lamp box, and the medial extremity relative to bulb is set.The present invention is simple in construction, easy to use, the waste heat that effective recycling projecting apparatus bulb is produced when working, and reaches the effect of cooling.

Description

A thermal balance heat dissipation device for a projector

technical field

The invention belongs to the technical field of thermoelectric semiconductor power generation, and in particular relates to a heat balance cooling device for a projector.

Background technique

Projectors, also known as projectors, are widely used in homes, offices, schools, and entertainment venues. LCD (LiquidCrystal Display) liquid crystal projectors can be divided into liquid crystal panel projectors and liquid crystal light cutting projectors. The former is the main product in the projector market. Polysilicon LCD panels are afraid of high temperature. Newer models are equipped with temperature sensors near the LCD panel. When the air inlet and dust filter are blocked and the air flow is not smooth, the temperature inside the projector will rise rapidly. At this time, the temperature sensor will Alarm and immediately cut off the light source circuit. Projectors have very strict requirements on the performance of the cooling system, so projector manufacturers will integrate a cooling system driven by additional power inside the projector, and match it with a high-reliability heat-sensitive fan control system to ensure that the cooling system does not reach the dangerous temperature of the bulb. The value started successfully before. Therefore, when the projector is working normally, it must allocate a certain amount of power to drive the cooling system to work, resulting in additional energy consumption. At present, the number of projectors in major universities, institutions, enterprises and institutions is very large, and it is showing a rapid upward trend.

Generally, the correct startup sequence of the projector is: first turn on the power button, then press the Lamp button on the operation panel, and wait until the flashing green signal light stops flashing, the startup is complete. This part of the additional control part will undoubtedly reduce the reliability of the system to a large extent: once the thermal element is accidentally damaged, the fan cannot be started automatically, causing the bulb to burn out. Not only that, when the user finishes using the projector, he cannot turn off the power immediately like using other electrical appliances. The fan must continue to work for a period of time to reduce the temperature of the bulb to a safe range. Incorrect operation can easily reduce the service life.

If the waste heat of the projector bulb can be fully utilized, the waste heat can be converted into electric energy to drive the fan to realize supply and heat dissipation. It can not only reduce the extra power loss, but also achieve the self-balancing and self-stabilizing effect of only relying on the recovery of waste heat to dissipate heat. The waste heat utilization projector cooling system based on thermoelectric power generation integrates the thermoelectric power generation semiconductor chips with mature technology and stable performance and a specially designed shell to make a projector cooling system that is easy to order and install.

After searching the existing technologies, it was found that "Prospects for the Application of Semiconductor Refrigeration in Projector Heat Dissipation" published by Lu Yukun, Li Yanqi, etc. mentioned the inverse principle of thermoelectric power generation - the prospect of the application of the principle of thermoelectric refrigeration on projectors, theoretically Its feasibility is analyzed, but there is a problem of condensation and frost at the cold end of the refrigeration chip.

Contents of the invention

The technical problem to be solved by the present invention is to provide a heat balance heat dissipation device for a projector to realize self-balancing and self-stabilization of the heat dissipation system of the projector.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a heat balance heat dissipation device for projectors, which is characterized in that it includes a bracket, a heat balance heat dissipation component and a safety protection component. For the projector light bulb, the bottom end is connected to the front cover at the outer end of the light bulb. The heat balance heat dissipation components are respectively installed on the four side frames of the bracket. The safety protection component is fixed inside the projector light box, relative to the inside of the light bulb terminal settings.

According to the above scheme, the heat balance cooling assembly includes a cooling fan, a cooling fin, a thermoelectric module and a storage battery, the cooling fin is connected to the side frame of the support, the cooling fan is arranged on the outer end surface of the cooling fin, and the thermoelectric module is arranged on the On the inner end face of the cooling fins, the storage battery is connected to the thermoelectric module through cables.

According to the above solution, graphite carbon paper is arranged on the hot end surface of the thermoelectric module.

According to the above solution, the inner end surface of the graphite carbon paper is an arc-shaped structure, which is configured with the outer surface of the projector bulb.

According to the above scheme, thermal conductive silicone grease is coated between the hot end of the thermoelectric module and the graphite carbon paper, and between the cold end and the cooling fins.

According to the above solution, the safety protection component includes a safety protection fan, a temperature sensor and a PLC controller, the safety protection fan is installed inside the projector lamp box, and is arranged relative to the inner side of the bulb, and the temperature sensor is arranged on the bulb , the input end of the PLC controller is connected to the temperature sensor, the output end is connected to the safety protection fan, and the safety protection fan is connected to the storage battery through a cable.

According to the above scheme, the two ends of the four frames of the bottom frame of the bracket are respectively connected to the front cover body at the outer end of the bulb through "U"-shaped connecting pieces.

According to the above scheme, the two ends of the four frames of the top frame of the support are provided with wiring grooves.

According to the above scheme, the four corners of the four side frames of the bracket are all provided with support plates, which are configured with the thermoelectric modules.

The beneficial effects of the present invention are: to provide a heat balance cooling device for a projector, which can effectively recycle and utilize the waste heat generated when the bulb of the projector works, convert the waste heat into electric energy to drive the fan to realize supply and heat dissipation, and save the power required by the projector heat dissipation system Energy, to achieve self-balancing and self-stabilization of the projector cooling system; the power generated by the thermoelectric module is supplied to the cooling fan at the cold end to work normally, and the excess power generated is stored in the battery. If the projector is suddenly powered off abnormally, the temperature sensor will receive When a signal indicating that the temperature of the bulb is too high, a signal is sent, and the battery drives a safety protection fan to dissipate heat from the projector bulb, which effectively solves the problem of the accumulated temperature of the projector bulb in case of a sudden power failure, and ensures the safety of the overall device.

Description of drawings

Fig. 1 is an installation distribution diagram of an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a heat balance cooling assembly according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a stent according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an embodiment of the present invention.

Among them: 1-bracket, 2-bulb, 3-front cover, 4-cooling fan, 5-cooling fin, 6-thermoelectric module, 7-graphite carbon paper, 8-safety protection fan, 9-"U" type Connecting sheet, 10-wire slot, 11-support plate.

detailed description

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, a heat balance heat dissipation device for a projector includes a bracket 1, a heat balance heat dissipation component and a safety protection component. The front cover body 3 is connected to each other, and the thermal balance cooling components are installed on the four side frames of the support respectively, and the safety protection component is fixed inside the projector light box, and is arranged relative to the inner side of the bulb.

As shown in Figure 2, the heat balance cooling assembly includes cooling fan 4, cooling fins 5, thermoelectric module 6 and storage battery, cooling fan is arranged on the outer end surface of cooling fin, and thermoelectric module is arranged on the inner side end surface of cooling fin, heat dissipation The fins are connected to the side frame of the support to realize the fixation of the entire heat balance cooling assembly, and the battery and the thermoelectric module are connected through cables. The hot end face of the thermoelectric module is provided with graphite carbon paper 7, which fills the gap between the thermoelectric module and the light bulb, and improves the contact between the thermoelectric module and the light bulb. The outer surfaces of the bulbs are configured in phase.

Thermal conductive silicone grease is coated between the hot end of the thermoelectric module and the graphite carbon paper, between the cold end and the heat dissipation fins, which fills the small gaps between the joint surfaces, reduces thermal resistance, effectively improves the heat conduction rate, and enables The hot end of the thermoelectric module is evenly heated.

The safety protection component includes a safety protection fan 8, a temperature sensor and a PLC controller. The safety protection fan is installed inside the light box of the projector, set relative to the inner side of the light bulb, the temperature sensor is set on the light bulb, and the input terminal of the PLC controller is connected to the temperature sensor. The output end is connected with the safety protection fan, and the safety protection fan is connected with the storage battery through a cable.

The two ends of the four frames of the bracket bottom frame are respectively connected to the front cover body at the outer end of the bulb through the "U"-shaped connecting piece 9, and the top of the front cover body is connected to the projector housing. Both ends of the four frames of the top frame of the bracket are provided with wiring grooves 10, through which the cables of the thermoelectric module go out and connect with the battery. Four corners of the four side frames of the bracket are provided with support plates 11 for supporting the thermoelectric modules.

As shown in Figure 4, the function of the present invention is realized through the following steps: first, according to the power, heat loss and temperature control requirements of the light bulb, match the size, quantity, temperature difference and power generation parameters of the thermoelectric module, and the cooling fan parameters; power on the projector , the internal temperature is still low, the projector does not need heat dissipation, the temperature difference between the cold and hot ends of the thermoelectric module has not reached the set value, the generated voltage is insufficient, the fan does not run, and the surface temperature of the projector bulb gradually rises after turning on for a period of time, which is still within the safe range At this time, the voltage generated by the thermoelectric module is sufficient to drive the cooling fan to run, continuously take away the heat transferred to the cooling fins, maintain the temperature difference between the cold end and the hot end, and make the heat absorbed by the graphite at the hot end naturally conduct due to the temperature gradient, and the temperature gradient The larger the heat transfer rate is, the faster the heat conduction rate is. The electric energy generated by the thermoelectric module is supplied to the cooling fan for normal operation, and the excess electricity generated is stored in the battery. Since the power and heat loss of the light bulb are constant, that is, the heat input power of the light bulb to the system is constant, the thermoelectric module drives the cooling fan at the cold end to continuously take away the heat transferred to the fins, increasing the temperature difference between the cold end and the hot end. The power of the thermoelectric module to absorb heat energy increases with the increase of the temperature difference between the cold end and the hot end. The temperature of the system reaches a steady state when the power of the bulb to input heat into the system is equal to the power of the thermoelectric module to absorb heat. At this time, if the thermoelectric balance state is disturbed by changes in the ambient temperature and the load of the projector, the system will exert its self-stabilizing function and react as follows: if the temperature of the projector bulb rises, the temperature difference between the two ends of the thermoelectric module will rise, resulting in a larger The voltage and cooling power of the fan are further increased, forcing the surface of the bulb to cool down, and then the cooling power is reduced by itself, and the system reaches a new equilibrium state; For the heat dissipation of the bulb, the temperature drop is contained, and the system is re-balanced. The temperature sensor always detects the surface temperature of the bulb. If there is an unstable or unexpected situation and the bulb temperature is too high, the PLC controller will turn on the safety protection fan to cool the projector bulb to ensure the safety of the instrument.

The above are only preferred embodiments of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the patent scope of the present invention still belong to the protection scope of the present invention.

Claims (9)

1. a kind of thermal balance heat abstractor for projecting apparatus, it is characterised in that including support, thermal balance radiating subassembly and safety Component is protected, the support is positive truncated rectangular pyramids framework structure, be coated at projecting apparatus bulb, bottom and the preceding cover body of bulb outboard end It is connected, the thermal balance radiating subassembly is installed on four lateral frames of support respectively, and the safeguard protection component is fixed on Inside projecting apparatus lamp box, the medial extremity relative to bulb is set.

2. a kind of thermal balance heat abstractor for projecting apparatus according to claim 1, it is characterised in that the thermal balance Radiating subassembly includes radiator fan, radiating fin, electrothermal module and battery, the lateral frame phase of radiating fin and the support Even, radiator fan located at radiating fin end face outside on, electrothermal module located at radiating fin inner side end on, battery with Electrothermal module is connected by cable.

3. a kind of thermal balance heat abstractor for projecting apparatus according to claim 2, it is characterised in that the thermoelectricity mould The hot junction end face of block is provided with graphite carbon paper.

4. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the graphitic carbon The inner side end of paper is arcuate structure, with projecting apparatus bulb outer surface phase configuration.

5. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the thermoelectricity mould Heat-conducting silicone grease is scribbled between the hot junction of block and graphite carbon paper, between cold end and radiating fin.

6. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the safety is protected Protecting assembly includes safeguard protection fan, temperature sensor and PLC, and the safeguard protection fan is installed in projecting apparatus lamp box Inside, the medial extremity relative to bulb is set, and the temperature sensor is on bulb, the PLC input and temperature Spend sensor to be connected, output end is connected with safeguard protection fan, and safeguard protection fan is connected with the battery by cable.

7. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the support bottom The two ends of the four edges frame of portion's framework are connected by " U " type connection sheet and the front shroud body phase of the bulb outboard end respectively.

8. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the top of support The two ends of the four edges frame of portion's framework are equipped with cabling channel.

9. a kind of thermal balance heat abstractor for projecting apparatus according to claim 3, it is characterised in that the support The corner location of four lateral frames is equipped with supporting plate, with the electrothermal module phase configuration.