CN103760737A - Waste heat utilization projector heat-dissipation system based on thermoelectric power generation - Google Patents

Abstract

A projector heat dissipation system belonging to the technical field of semiconductor power generation, comprising a projector base, a projector bulb, a thermoelectric generator, a generator holder and a fan, the projector bulb is installed on the base, and the thermoelectric generator is arranged on the projector bulb The generator sheet holder is installed on the four sides in a positive fit manner, and the generator sheet holder is installed on the projector base through threaded holes; the output ends of the thermoelectric generator sheets are connected in series, and the total voltage output wire is connected to the generator sheet holder. The left port is connected; the output power line of the thermoelectric power generation component is directly connected to the input end of the fan, and the wire is fixed on the shell of the projector away from the heating components. The invention has reasonable design and simple structure, and can solve the problems of power supply of the heat dissipation system of the projector bulb and protection of the projector bulb when the human operation is improper.

Description

Waste heat utilization projector cooling system based on temperature difference power generation

technical field

The present invention relates to a heat dissipation device in the field of thermoelectric semiconductor power generation technology, in particular to a heat dissipation system for utilizing waste heat of a projector based on thermoelectric power generation.

Background technique

A projector, also known as a projector, is a device that projects images or video onto a screen. At present, it has been widely used in homes, offices, schools and entertainment venues. LCD (Liquid Crystal Display) liquid crystal projectors can be divided into liquid crystal panel projectors and liquid crystal light valve 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 It will alarm and cut off the light source circuit immediately. 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 temperature-sensitive fan control system to ensure the cooling system when the temperature of the bulb reaches Started successfully before the dangerous value. 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. Misoperation can easily reduce the service life.

If the huge heat generated by the light bulb when the projector is working can be used to generate electricity to drive the cooling fan, the self-balancing and self-stabilizing effect of only relying on the recovery of waste heat to dissipate heat can be achieved without additional power loss. 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 technical literature, it was found that "Approach to the Practical Use of Thermoelectric Power Generation" ("Approach to the Practical Use of Thermoelectric Power Generation" published by Takenobu Kajikawa in the Journal of Electronic Materials) mentioned the Japanese YAMAHA The company's internal experimental prototype for the application of thermoelectric power generation technology on projectors. YAMAHA's prototype machine mainly applies the inverse principle of the thermoelectric power generation principle - the thermoelectric refrigeration principle: the input voltage at the two electrodes of the thermoelectric power generation semiconductor will generate a large temperature difference at both ends of the semiconductor, which is used to cancel the traditional projector. The noisy fan is expected to achieve the effect of compactness and quietness. At the same time, it also places thermoelectric chips on the heating components to collect waste heat. However, the prototype did not propose where to use the collected heat, but it was purely used to test the performance of the 320Bi-Te thermoelectric generator produced by TOSHIBA. At the same time, there are many problems if the thermoelectric power generation sheet is reversed as a cooling sheet: the distance between the cold and hot ends is too small, which brings great difficulties to cooling and heat dissipation, and the efficiency is not as good as that of traditional cooling fans.

Contents of the invention

The present invention aims at the above-mentioned deficiencies, and provides a waste heat utilization projector heat dissipation system based on temperature difference power generation, so as to solve the user experience weakness that the projector cannot be powered off immediately after use, and the projector component damage in the case of sudden power failure, Realize the practicality of the cooling system for self-balancing and self-stabilizing projectors. At the same time, this system will also overcome the problems of heat collection at the hot end and heat dissipation at the cold end that generally exist in the application of the existing thermoelectric power generation technology.

The present invention is achieved through the following technical solutions. The present invention includes a projector base, a projector bulb, a thermoelectric generator, a generator holder and a fan. The projector bulb is installed on the base, and the thermoelectric generator is arranged on the projector bulb. It is surrounded by interference fit and installed into the generator sheet holder, and the generator sheet holder is installed on the projector base through threaded holes; the output ends of the thermoelectric generators are connected in series, and the total voltage output wire is connected by the generator sheet holder. The output power line of the thermoelectric power generation component is directly connected to the input end of the fan, and the wire is fixed on the shell of the projector away from the heat-generating components.

Further, in the present invention, the thermoelectric power generation sheet is a square structure with a size of 8×8×2.5 mm.

Furthermore, in the present invention, the power generation piece holder is processed from a piece of copper sheet, and 25 grooves are cold-worked on the power generation piece holder to reserve space for wires.

Furthermore, in the present invention, the electric fan is a DC low-voltage starting type, which can withstand low-quality power supply and voltage fluctuation.

The function of the present invention is realized through the following steps: 1. the projector is turned on, the internal temperature is still low, and the projector does not need heat dissipation; the temperature difference between the two ends of the power generation sheet does not reach the set value, the system does not operate, and the fan does not run. ② After starting for a period of time, the surface temperature of the projector bulb rises to the set value (for example, 80°C). At this time, the temperature of the projector bulb is still within the safe range, but it should gradually start to dissipate heat when it is close to the dangerous value. When the heat reaches the lower threshold of the system response, the total voltage generated by the thermosiphon is sufficient to drive the cooling fan; the cooling fan starts to work under the voltage from the power generation chip to dissipate heat for the system. ③ After the system starts, the surface temperature of the projector light is still rising, but because the heat dissipation power of the cooling fan is also rising, the speed of temperature rise gradually decreases. After working for about 5 minutes, the system reaches thermoelectric equilibrium: the surface temperature of the projector bulb no longer rises, but fluctuates within a small range around a set temperature value; the cooling power of the fan no longer rises, but in a specific Make small range fluctuations around the power value. At this time, if the thermoelectric balance state is destroyed due to changes in ambient temperature and projector workload, the system will exert its self-stabilizing function and respond as follows: if the temperature of the projector rises, the temperature difference between the two ends of the thermoelectric generation sheet will rise, resulting in more High voltage increases the heat dissipation power of the fan further, forcing the bulb to cool down, and then reduces the heat dissipation power by itself, and the system reaches a new equilibrium state; The heat dissipation is insufficient, the temperature drop is contained, and the system reaches a new balance.

The invention has the beneficial effects of saving the power energy required by the projector heat dissipation system, and at the same time, because the invention uses a passive heat dissipation system, it can effectively avoid damage to the projector bulb due to improper human operation. The invention can also realize the self-balance and self-stabilization of the heat dissipation system for the projector.

Description of drawings

Fig. 1 is a structural representation of the present invention;

The labels in the accompanying drawings are respectively: 1. Shadow instrument base, 2. Projector bulb, 3. Thermoelectric generator, 4. Power generator holder, 5. Fan.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention, and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to the following embodiments. .

Example

Embodiments of the present invention are shown in Figure 1, and the present invention comprises projector base 1, projector bulb 2, thermoelectric power generation piece 3, power generation piece holder 4 and fan 5, and projector bulb 2 is installed on the base 1, and thermoelectric power generation piece 3 is arranged around the bulb 2 of the projector and installed into the generator sheet holder 4 in an interference fit manner, and the generator sheet holder 4 is installed on the projector base 1 through threaded holes; the output end of the thermoelectric generator sheet 3 is connected in series connection, connect the total voltage output lead from the left port of the generating sheet holder 4; the output power line of the thermoelectric generating assembly is directly connected to the input end of the fan 5, and the wire is fixed on the projector shell far away from the heating component; the thermoelectric generating sheet 3 is a square structure with a size of 8×8×2.5mm; the generator piece holder 4 is processed from a piece of copper sheet, and 25 grooves are cold-processed on the generator piece holder 4 and space for wires is reserved; the electric fan 5 is DC low-voltage start-up type, able to withstand low-quality power supply and voltage fluctuations.

In the present invention, when the projector is turned on, the internal temperature is still low, and the projector does not need to dissipate heat; the temperature difference between the two ends of the thermoelectric power generation sheet 3 does not reach the set value, the system does not operate, and the fan does not run. After starting for a while, the surface temperature of the projector bulb 2 rises to the set value (for example, 80°C). At this time, the temperature of the projector bulb is still within the safe range, but it should gradually start to dissipate heat when it is close to the dangerous value; the heat reaches the system response. When the threshold is lowered, the total voltage generated by the thermoelectric generator 3 is sufficient to drive the cooling fan 5 to work; the cooling fan 5 starts to work under the voltage from the generator to dissipate heat for the system. After the system started, the projector light surface temperature was still rising, but because the cooling power of cooling fan 5 was also rising, the speed of temperature rising gradually decreased. After working for about 5 minutes, the system reaches thermoelectric equilibrium: the surface temperature of projector bulb 2 no longer rises, but fluctuates within a small range around a set temperature value; the cooling power of fan 5 no longer rises, but in A small range of fluctuations around a specific power value.

Claims (4)

1. A projector cooling system based on thermoelectric power generation using waste heat, comprising a projector base (1) and a projector bulb (2), the projector bulb (2) is installed on the base (1), characterized in that it also includes The thermoelectric power generation piece (3), the power generation piece holder (4) and the fan (5), the thermoelectric power generation piece (3) is arranged around the projector bulb (2) and installed into the power generation piece holder (4 ), the power generator retainer (4) is installed on the projector base (1) through threaded holes; the output ends of the thermoelectric power generators (3) are connected in series, and the total voltage output wire is connected to the power generator holder (4) The output power line of the thermoelectric power generation component is directly connected to the input end of the fan (5), and the wire is fixed on the projector shell away from the heat-generating components. 2. The waste heat utilization projector cooling system based on thermoelectric power generation according to claim 1, characterized in that the thermoelectric power generation sheet (3) is a square structure with a size of 8×8×2.5mm. 3. The waste heat utilization projector heat dissipation system based on thermoelectric power generation according to claim 2, characterized in that, the power generation sheet holder (4) is processed from a piece of copper sheet, on the generation sheet holder (4) Cold work out 25 grooves and reserve wire space. 4. The waste heat utilization projector heat dissipation system based on thermoelectric power generation according to claim 2, characterized in that the electric fan (5) is a DC low-voltage start-up type, which can withstand low-quality power supply and voltage fluctuations.

Images