KR910001088B1 - Cooling system - Google Patents

Abstract

In a cooling system of LCD projector a compressor (6) compresses the refrigerant from a liquid reservoir (1), and supplies it into the case (36) of the illumination system of LCD projector in order to cool the interior of the illumination system. The refrigerant recovered radiates heat while it passes through a heat exchanger (20) and is collected again into the liquid reservoir (1). The illumination system case (36) with a lamp-change cover includes a upper buoyancy switch (17) for detecting the amount of the refrigerant and being installed near the lamp (16), a temperature sensor (50) to detect the temperature of the liquid in the illumination case, a open switch (23) at the end of the illumination system case (36), and a lower buoyancy switch (8) in a buffer (9).

Description

LCD Projector Cooling System

1 is a configuration of a liquid cooling system according to the present invention.

2 is a locking switch structure of the lamp replacement cover of the present invention.

3 is a structural diagram of a buoyancy switch of the present invention.

4 is a control circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: Supplementary container 8: Lower buoyancy switch

15: Lamp replacement cover 17: Upper buoyancy switch

20: heat exchanger 23: open switch

3: lamp replacement switch 36: lighting system case

50: temperature sensor A: lamp driving control unit

B: comparator c: compressor drive controller

D: Motor Drive Control Bar: Locking Switch Control

The present invention relates to a cooling system of an LCD projector lighting system, and more particularly, to a system for increasing the cooling efficiency and configuring a safety device for replacing a lamp in a liquid cooling system. In an illumination system that scans an image from an LCD projector, heat is generated by the light source, so it must be released to the outside to maintain its function when used continuously. Therefore, as a method of releasing or cooling the heat generated by the lighting system, conventionally, a fan for generating wind is installed at the shaft end of the motor to cool the heat of the lighting system with the wind generated by rotating the motor at high speed, thereby achieving the desired purpose. Although there was a noise caused by the motor, there was a problem that the reliability of the product is lowered when using the projector.

In addition, the noise of such a motor also forms a vibration there was a problem that the product shakes.

Therefore, the present invention is a method of cooling by water cooling, unlike air cooling, in which the worm 5 is a bevel gear 4 and worm of the motor 3 in the supplementary container 1 capable of storing refrigerant as shown in FIG. It is configured to move up and down vertically by the gear (2), and the flow paths (L, A) are formed at the upper and lower ends of the supplementary container (1), thereby connecting the compressor (6) to the lower flow path (A), and fastening the lower part at the end of the flow path. A screw 7 is installed to connect the buffer case 9 with the lower buoyancy switch 8 installed thereon, and to the upper side of the buffer case 9 and the lower case 36 of the lighting system 13. In the lighting system 13, an LCD panel 12, a field lens 10, a heat dissipation filter 11, a condenser lens 35, a lamp 16 and a rearview mirror 21, a temperature sensor 50, and the like are sequentially arranged. In this configuration, the flow path for the refrigerant flows through the inlet (D) at the rear of the LCD panel 12, the upper side (E) (F) of the heel lens 10, and the lower end (G) (H) of the heat dissipation filter (11). ) The outlet K is formed at the upper side of the image side I (J) and the rearview mirror 21 of the condenser lens 35. The upper fastening screw 19 of the flow path is connected to the outlet K of the lighting system 13 case 36, and the heat exchanger 20 is connected to the flow path to be connected to the flow path L of the refill container 1.

In order to secure replacement of the lamp 16 of the lighting system 13, an upper buoyancy switch 17 is installed near the lamp installation position in the lighting system case 36, and the lamp replacement cover which slides back and forth on the lamp installation position. 15 is installed, but the locking groove 14 installed in the case 36 is formed by forming a locking groove at the bottom thereof, and an open switch 23 is formed at the tip of the case 36.

2 shows the locking switch 14 of the lamp replacement cover according to the present invention. The locking knob 29 installed in the groove of the case 36 of the lighting system 13 is supported by a pin 26 on one side thereof. Rotating iron plate 24 is attached to the bottom, and the locking spring 25 is always installed between the locking knob 29 and the case grooves to act elastically upward.

One side of the locking spring 25 is configured to have an electromagnet 22 installed thereon. Figure 3 shows the structure of the buoyancy switch (8) or (17) in the present invention, the upper, lower buoyancy switch (8) (17) forms a groove in the case or shock absorber and the buoyancy ball 28 therein It is fitted in a structure that does not deviate and forms a configuration in which the respective contact points 27 are installed at two upper sides.

)은 앤드게이트(A3)의 타입력단과 접속되어 인버터(16)와 전계효과 트랜지스터(Q1∼Q4)로 구성된 모터 구동회로(35)를 거쳐 모터(3)에 접속되고, 상기 앤드게이트(A3,A4)의 출력단은 오아게이트(OR1)를 거쳐 앤드게이트(A5)의 입력단에 접속되고 앤드게이트(A2)의 출력은 앤드게이트(A5)의 타입력단에 접속되며 앤드게이트(A5)의 출력단은 다이리스터(SCR3)의 게이트에 접속되고, 다이리스터(SCR3)의 캐소우드는 전계효과 트랜지스터(Q2,Q4)에 접속되도록 구성한 것으로 이러한 구성으로 이루어진 본 발명의 냉각시스템은 보충통(1), 콤프레샤(6), 완충케이스(9), 상부체결나사(19), 열교환기(20)등으로 구성되며, 냉매는 냉각시스템에서 A→B→C→D→E→F→G→H→I→J→K→L 등의 순서로 흘러간다.4 shows a control circuit of the present invention, in which a lamp replacement switch 30 connected to a power supply 5V is connected to a gate of a thyristor SCR1 connected to a lamp 16 and a power supply Vcc via an inverter I1. At the same time, the temperature sensor 50 connected to the input terminal of the AND gate A2 and connected to the illumination system 13 of FIG. 1 is applied to the "-" input terminal of the comparator 31 and is connected to the "+" input terminal of the comparator 31. When the reference voltage Ref is applied, the output terminal of the comparator 31 is connected to the input terminal of the AND gate A2 through the control diode 32 and is connected to the input terminal of the AND gate A1 through the inverter 12. In FIG. 1, a power supply 5V is applied to one end of the upper buoyancy switch 17 installed near the lamp 16, and the other end of the upper buoyancy switch 17 is connected to the type force end of the AND gate A1. At the same time, it is connected to the input terminal of the end gate A4 via the inverter 13, and in FIG. Power supply 5V is applied to one end of the lower buoyancy switch 8 installed in 9), and the other end of the lower buoyancy switch 8 is connected to the input terminal of the end gate A3 and is connected to the input terminal of the end gate A3. The open switch 23 connected to the electromagnet 22 and the light emitting diode LD1 of the second-degree locking switch, respectively, and installed at the tip of the lighting system case 36 is connected to the input terminal of the AND gate A4 via the inverter 14. Connected at the same time to the clock terminal CK of the T flip-flop 33, the output terminal Q of the T flip-flop 33 is connected to the type force terminal of the AND gate A4, and to the T flip-flop 33 Inverted output terminal

Is connected to the type force terminal of the AND gate A3 and is connected to the motor 3 via the motor driving circuit 35 composed of the inverter 16 and the field effect transistors Q1 to Q4. The output terminal of A4) is connected to the input terminal of the AND gate A5 via the OR gate OR1, the output of the AND gate A2 is connected to the type force terminal of the AND gate A5, and the output terminal of the AND gate A5 is die The cooling system of the present invention is configured to be connected to the gate of the Lister SCR3, and the cathode of the Lister SCR3 is connected to the field effect transistors Q2 and Q4. 6), buffer case (9), upper fastening screw (19), heat exchanger (20), etc., and the refrigerant in the cooling system A → B → C → D → E → F → G → H → I → J → K → L and so on.

Here, the supplementary cylinder 1 is necessary to increase the amount of the refrigerant and is necessary because the volume of the illumination system case 36 is not large.

And the compressor (6) is for smoothing the flow of the refrigerant, the hot refrigerant coming out through the "K" is cooled in the heat exchanger 20 and then sent to the refill container (1). In addition, the lamp 16 has a problem that should be replaced when the end of life using the 1000-2000 hours, the hot liquid is not contained in the lighting system case 36, and the power of the lamp is "on", A safety device is needed to prevent lamp replacement when the liquid is hot. Various switches and control circuits are for the safety device.

Therefore, the operation and configuration of the safety device is as follows. In FIG. 1, in order to replace the lamp 16, the lamp replacement cover 16 needs to be pushed to the right, but the locking switch 14 of the replacement cover 16 is caught and is not pushed to the right. This is to prevent the lamp 16 from being pulled out when the refrigerant liquid is filled in the illumination system case 36 or the liquid is hot. At this time, when the lamp replacement switch 3 of the FIG. 4 control circuit for which the lamp is to be replaced is switched to 5V, the output of the inverter 11 becomes "low" and is applied to the gate of the thyristor SCR1 to supply the thyristor SCR1. The lamp 16 in FIG. 1 is automatically turned off because it is " off ".

='하이'로 셋팅되어 있어 앤드게이트(A3)의 출력이 "하이"이고 이에 의해 오아게이트(OR1)의 출력도 "하이"가 되므로 앤드게이트(A5)의 출력이 "하이"로 되어 다이리스터(SCR3)가 "온"되어 모터(3)에 전원이 인가된다.On the other hand, the comparator 31 compares the temperature at this time detected by the temperature sensor 50 installed in the illumination system 13 with the reference temperature Ref, and if the detected liquid temperature is higher than the set reference temperature (that is, the illumination system). When the temperature of is high), the output of the comparator 31 becomes "low", and in this case, the upper buoyancy switch 17 as shown in FIG. The output is " high " applied to the gate of the diester SCR2 to " on " the diester SCR2 so that the compressor 6 is operated to continue cooling (here the top and bottom buoyancy switches 17 and 8). It is possible to know whether the liquid is filled inside the lighting system case 36 and the buffer case 9 because the buoyancy ball 28 is buoyant by the liquid to "on" the contact 27. ) Cooling proceeds and the output of the comparator 31 is " high " (Ie, when the detected temperature is lower than the reference temperature), the output of the inverter 12 becomes " low " and the output of the AND gate A1 also becomes " low ", so that the thyristor SCR2 is " off ". Therefore, the operation of the compressor 6 is stopped. At this time, since the output of the lamp replacement switch 30 is "high" and the output of the comparator 31 is "high", the output of the endgator A2 becomes "high", in which case the open switch 23 has not yet been operated. (This open switch 23 is attached to the stopper of the lighting system case 36. When the stopper is pushed to the right, the switch is connected and the output of the open switch 23 and the output becomes "high.") The output of the lower buoyancy switch (8) is "high" and the output of the lower buoyancy switch (8) is "high" because the lower buoyancy switch (8) is in the "on" state (in this case, the liquid is filled in the buffer case). Since the output of the switch 23 has never been "high", the output of the T flip-flop 33 is Q = 'low'

= 'High' and the output of the AND gate A3 is "high" and the output of the OR gate OR1 also becomes "high", so the output of the AND gate A5 becomes "high" and the thyristor (SCR3) is " on " to supply power to the motor 3.

)이 "하이"이므로 전계효과 트랜지스터(Q1∼Q4) 모터구동회로(35)에 "하이"의 콘트롤신호가 주어져서 전류가 흐르게 되며 이때 모터(3)와 연결되는 베벨기어(4)와 워엄기어(2), 워엄(5)등에 의해 보충통(1)이 하강하게 된다.At this time, the inverted output of the T flip-flop 33

) Is "high", the control signal of "high" is given to the field effect transistors Q1-Q4 motor drive circuit 35, and a current flows, and the bevel gear 4 and the worm gear (connected with the motor 3) are carried out at this time. 2) The refill container 1 is lowered by the worm 5 or the like.

When the lowering of the make-up cylinder 1 proceeds completely and the refrigerant liquid in the lighting system 13 has all escaped to the make-up cylinder 1 and the lower buoyancy switch 8 is "off", the output of the lower buoyancy switch 8 is " Low ", the output of the AND gates A3 and A4 is" low ", and the output of the oragate OR1 is also" low ", so that the thyristor SCR3 is" off "and the motor 3 which was driven is stopped. do.

At this time, the "low" output of the lower buoyancy switch 8 is inverted to "high" by the inverter 15 so that current flows to the electromagnet 22, and is attached to the electromagnet 22 by the iron plate 24 as shown in FIG. In this case, the locking of the lamp replacement cover IS is released in FIG. 1.

Therefore, the replacement allowable light emitting diode LD1 is turned on so that the user can replace the lamp 16 by removing the lamp replacement cover 15.

In this state, since the lighting case open switch 23 is in the " on " state, the output of the " off " switch 23 is " high " applied to the clock terminal CK of the T flip-flop 33 so that the T flip-flop 33 ) Output Q changes to "high".

In addition, since the output of the open switch 23 is "high", the output of the inverter I4 becomes "low", the output of the AND gate A4 also becomes "low", and the output of the lower buoyancy switch 8 is also Since it is "low", the output of the AND gate A3 is also "low" so that the motor 3 is still not driven.

)이 "로우"이므로 모터는 화살표 방향의 반대방향으로 구동되어 모터(3)에 연결된 워엄(5)에 의해 보충통(1)이 상승하게 된다.When the lamp replacement cover 15 is closed again after the replacement of the lamp 16, the output of the open switch 23 becomes “low” and the output of the “low” open switch 23 passes through the inverter 14. Since the high Q and the output Q of the T flip-flop 33 are also high, and the liquid is not filled in the lighting case, the upper buoyancy switch 7 is "off" and its output is "low" so that the inverter ( The signal inverted through 13 becomes " high ", so that the output of the AND gate A4 becomes " high ", and as a result, the thyristor SCR3 is " on " so that the motor 3 is driven again. Inverted output of flip-flop 33

) Is "low", the motor is driven in the opposite direction of the arrow direction, the refill cylinder 1 is raised by the worm (5) connected to the motor (3).

)도 "로우"이므로 앤드게이트(A3)의 출력이 "로우"가 되어 오아게이트(OR1)의 출력이 "로우", 앤드게이트(A5)의 출력도 "로우"로 되므로 다이리스터(SCR3)가 "오프"되어 모터(3)의 구동이 정지한다.When the liquid rises to the maximum and the inside of the lighting system case 36 becomes full, the upper buoyancy switch 17 is "on" by the refrigerant to be filled, so the output of the upper buoyancy switch 17 becomes high and the inverter 13 is turned on. Since it becomes "low" through, the output of the AND gate A4 becomes "low", and the inverted output of the T flip-flop 33 (

) Is also "low", the output of the AND gate A3 is "low", the output of the OR gate OR1 is "low", and the output of the AND gate A5 is also "low", so that the thyristor SCR3 is "Off" stops driving of the motor 3.

On the other hand, at this time, since the output of the lower buoyancy switch 8 is "high", since no current flows in the electromagnet 22, the lamp replacement cover 15 is locked again by the action of the locking spring 25.

As described above, according to the present invention, the heat in the lighting system case can be easily cooled by passing the lighting system case in which the low temperature refrigerant is heated by the compressor and the heat exchanger. When the lamp is replaced, there is no difference in refrigerant inside the lighting case, and the lamp can be replaced only when the lamp is not hot, so that the lamp can be safely replaced.

Claims (5)

In the illumination system cooling method of the LCD projector, the liquid refill container 1 compresses and supplies the liquid refrigerant into the illumination system case 36 of the LCD projector to cool the inside of the illumination system, and the heat of the recovered refrigerant is transferred to a heat exchanger ( 20) A cooling system of an LCD projector that cools through and increases the cooling efficiency by returning it to the supplement container (1). The upper buoyancy switch (17) according to claim 1, wherein the lamp replacement cover (15) is provided in the illumination system case (36), and the lamp replacement cover (15) is installed near the lamp (16) installation position in the illumination case (13) to detect the amount of refrigerant. And a temperature sensor 50 for detecting the liquid temperature inside the lighting case, an open switch 23 installed at the tip of the lighting system case 36, a lower buoyancy switch 8 provided inside the buffer case 9, The lamp replacement cover 15 can be opened only when the refrigerant is not hot when the refrigerant is not filled in the lighting system case 36 by checking various current conditions using the lamp replacement switch 30 and the like. Cooling system of an LCD projector, characterized in that it comprises a safety device to make it. 3. The safety device according to claim 2, wherein the safety device is operated by the output of the lamp replacement switch 30 to control the on / off of the lamp 16, and the liquid temperature inside the lighting system case 36. It is operated by the output of the comparison unit (b) comparing the reference temperature, the upper buoyancy switch (17) which is turned on when the liquid is filled inside the lighting system case (36) and the output of the comparison unit (b). 6) the compressor drive control unit (c) for controlling the driving of the lamp, the output of the lamp replacement switch (30) and the output of the comparison unit (b), the output of the upper buoyancy switch (17) and the buffer case (9). A motor drive control unit for controlling the driving of the motor 3 by receiving the output of the lower buoyancy switch 8, which is turned on when the liquid is full, and the output of the open switch 23 installed at the tip of the lighting system case 36. ) And the locks are operated by the output of the lower buoyancy switch 8 Locking switch control unit (E) cooling system of the LCD projector, characterized in that comprises a value for controlling the operation. The locking knob (14) of claim 2, wherein the locking switch (14) forms a locking groove in a bottom surface of the lamp replacement cover (15), attaches an electromagnet in the lighting system case (36), and attaches an iron plate (24) to the top thereof. Cooling system of an LCD projector, characterized in that 29 is configured to lock the lamp replacement cover 15 by the locking spring 25 to the point 26. According to claim 2, the buoyancy switch (17, 8) is formed in the lighting system case or the shock absorber (9) to install the respective contact point 27 in the upper two places, the buoyancy ball 28 in the groove Cooling system of the LCD projector, characterized in that the insertion is configured not to be separated.

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