JP4631127B2 - Manufacturing method and manufacturing apparatus of liquid-cooled cathode ray tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a cooling liquid in a coupler of a liquid-cooled cathode ray tube constituting a projection television receiver and an apparatus for manufacturing the same.
[0002]
[Prior art]
As a manufacturing method of a liquid-cooled cathode ray tube constituting a projection television receiver, for example, in Japanese Patent Laid-Open No. 10-162738, before injecting a cooling liquid into a coupler of a liquid-cooled cathode ray tube, the liquid leakage of the coupler We propose a method to check the air pressure.
[0003]
[Problems to be solved by the invention]
However, the process of sealing the cooling liquid into the liquid-cooled cathode ray tube is not only for checking the leakage of the coupler, but also injecting the cooling liquid into the coupler, and then mixing the air, the lens, the pressure adjusting diaphragm, A defoaming process is required to remove air and the like present in a small gap constituted by a combination of couplers and the like.
Further, a coolant replenishment process for replenishing the coolant reduced by the defoaming process to a predetermined water level in the coupler is necessary.
If the defoaming process is neglected or the reduced cooling liquid is not replenished to a predetermined water level, the air present in the coupler moves to an arbitrary part in the coupler during the assembly process or the transport process, and the image is uneven when projecting an image. There is a risk of adverse effects such as.
[0004]
The manufacturing method and the manufacturing apparatus of the liquid-cooled cathode ray tube according to the present invention include steps of coupler liquid leak check, coolant injection, defoaming, and coolant replenishment, and an object of automating each step.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the manufacturing method and the manufacturing apparatus of the cold cathode ray tube according to the present invention are for checking the leakage of the coupler, injecting the cooling liquid into the coupler, defoaming the coupler, and supplying the cooling liquid into the coupler. It was set as the structure provided with each process. Moreover, it was set as the manufacturing apparatus provided with the automation stage of each said process.
Further, the cooling liquid injection means includes an optical fiber level sensor.
Furthermore, it was set as the structure which provided the defoaming process in multiple stages.
[0006]
With the above configuration, the present invention can efficiently fill the cooling liquid, and can configure a highly reliable liquid-cooled cathode ray tube free from liquid leakage or liquid shortage.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, there is provided coupler liquid leakage inspection means for injecting air into a coupler of a cathode ray tube and measuring air pressure to inspect liquid leakage in the coupler, and cooling for injecting cooling liquid into the coupler. A liquid injecting means; a defoaming means for removing air existing in the coupler by vacuum suction after the cooling liquid is injected; and a coolant replenishing means for replenishing the coolant reduced by the defoaming to a predetermined water level of the coupler. The apparatus for manufacturing a liquid-cooled cathode ray tube is characterized in that the liquid coolant can be filled efficiently, and a highly reliable liquid-cooled cathode ray tube free from liquid leakage or liquid shortage can be constructed.
[0008]
According to a second aspect of the present invention, there is provided the apparatus for manufacturing a liquid-cooled cathode ray tube according to the first aspect, characterized in that the cooling liquid injection means includes an optical fiber liquid level sensor. The water level can be accurately monitored and the coolant can be injected into the desired water level.
[0009]
Hereinafter, a method and an apparatus for manufacturing a liquid-cooled cathode ray tube according to an embodiment of the present invention will be described with reference to the drawings.
[0010]
(Embodiment)
FIG. 1 is a conceptual flow chart of a liquid-cooled cathode ray tube manufacturing process according to an embodiment of the present invention, FIG. 2 is a perspective view of a main part of a liquid-cooled cathode ray tube manufacturing apparatus embodying FIG. 1, and FIG. FIG. 4 shows a side view of the main part of the defoaming means constituting FIG.
[0011]
1 and 2, reference numeral 100 denotes a cooling liquid sealing device according to one embodiment of the present invention, 200 denotes a cathode ray tube (CRT), 10 denotes a cathode ray tube supply / extraction step, 20 denotes a coupler liquid leakage inspection step, 30 is a coolant (refrigerant) injection process, 40 is a defoaming process, 50 is a coolant supply process, 31 is a coolant injection means, 32 is a coolant injection pipe, 33 is a filter, 35 is a liquid feed tank, and 36 is a reserve. Defoaming pump, 37 is a preliminary defoaming tank, 38 is a cooling drum, 39 is a lid, and 45 is a defoaming pump.
[0012]
As shown in FIG. 1, the manufacturing process of the liquid-cooled cathode ray tube according to the present invention is a coupler liquid leakage inspection step 20 in which air is injected into a coupler of the cathode ray tube and the air pressure is measured to inspect the liquid leakage in the coupler. A cooling liquid injection process 30 for injecting a cooling liquid into the coupler, a defoaming process 40 for removing air existing in the coupler by vacuum suction after the cooling liquid injection, and a cooling liquid reduced by defoaming And a coolant replenishment step 50 for replenishing the coupler to a predetermined water level. The defoaming step 40 includes a plurality of defoaming steps 41, 42, 43, and 44.
[0013]
A cooling liquid sealing apparatus 100 of the present invention is shown in FIG. In the stage 10 described as a workstation in FIG. 1, the cathode ray tube 200 is supplied and taken out by a person or an automatic machine.
[0014]
The coupler liquid leak inspection process 20 for measuring the air pressure to inspect the liquid leak in the coupler 201 is performed using a commercially available air leak tester 21. The air leak test was performed at about 30 KPa for about 20 seconds.
[0015]
As shown in FIGS. 2 and 3, the coolant injection process 30 for injecting the coolant into the coupler 201 includes a coolant drum 38, a preliminary defoaming tank 37, a liquid feed tank 35, a filter 33, and a coolant injection pipe 32. This is carried out via the discharge valve 33. The filter 33 removes foreign matters mixed in the coolant for some reason.
[0016]
In the cooling liquid injection operation, the lid 39 is first lowered to close the injection hole 202 of the coupler 201. Thereafter, a cooling liquid such as ethylene glycol was injected until the water level reached a predetermined level while monitoring the cooling liquid level in the coupler 201 with the optical fiber liquid level sensor 34. The injection time takes about 20 seconds.
[0017]
The defoaming step 40 for removing the air existing in the coupler 201 by vacuum suction after the cooling liquid is injected is performed by using a defoaming pump 45 in four stages as shown in FIGS. The The defoaming operation is naturally performed by closing the injection hole 202 in an airtight state using the lid 22 driven by the air cylinder 23 or the like.
As shown in FIG. 4, vacuum suction for defoaming is performed through an on-off valve 24 using a mechanical shut mechanism. The on-off valve 24 is switched between open and close as desired by the separation and contact of the cylindrical body 26 driven by the air cylinder 25. Therefore, there is a section where the vacuum table is interrupted by rotation of the turntable 101 between the defoaming steps 41-44. However, the vacuum suction path is shut off from the atmosphere by the on-off valve 24, and the degree of vacuum in the coupler 201 does not substantially change. The vacuum suction operation is performed for 20 seconds × 4 = 80 seconds in total during the defoaming steps 41 to 44.
[0018]
Next, the coolant replenishment step 50 for replenishing the coolant reduced by the defoaming step to the predetermined water level of the coupler 201 is performed through the same apparatus and steps as the coolant injection step 30. As a matter of course, the coolant is replenished until the ethylene glycol reaches a predetermined level while monitoring the coolant level in the coupler 201 with the optical fiber level sensor 34.
[0019]
Thereafter, a pressure adjusting diaphragm is inserted into the injection hole 202 of the coupler, and then the injection hole 202 is closed with a predetermined lid, thereby completing the cooling liquid filling operation of the liquid-cooled cathode ray tube. Then, aging of the liquid-cooled cathode ray tube is performed as necessary. (Neither shown)
[0020]
【The invention's effect】
As described above, the present invention can automatically and efficiently enclose the cooling liquid, and can form a highly reliable liquid-cooled cathode ray tube free from liquid leakage and liquid shortage by defoaming and replenishment of the cooling liquid.
[Brief description of the drawings]
FIG. 1 is a conceptual flow chart of a liquid-cooled cathode ray tube manufacturing process according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of a liquid-cooled cathode ray tube manufacturing apparatus according to an embodiment of the present invention. 3 is a front view of the main part of the coolant injection means constituting FIG. 2. FIG. 4 is a side view of the main part of the defoaming means constituting FIG.
10 Cathode Ray Tube Supply / Removal Process 20 Coupler Liquid Leak Inspection Process 21 Air Leak Tester 22 Lid 23, 25 Cylinder 24 On-off Valve (Mechanical Shut Valve)
26 Cylindrical body 30 Coolant (refrigerant)
40 Defoaming step 50 Coolant replenishment step 31 Coolant injection means 32 Coolant injection pipe 33 Filter 34 Liquid level sensor (optical fiber)
35 Liquid feed tank 36 Preliminary defoaming pump 37 Preliminary defoaming tank 38 Coolant drum 39 Lid 45 Defoaming pump 100 Coolant filling device 200 Cathode ray tube (CRT)
201 Coupler 202 Injection hole 210 Lens

Claims (2)

A coupler liquid leakage inspection process for injecting air into a coupler of a cathode ray tube and measuring air pressure to inspect the liquid leakage in the coupler;
A coolant injection step of injecting a coolant into the coupler;
A plurality of defoamers that remove the air present in the coupler by vacuum suction after injecting the coolant using an on-off valve that can be opened and closed as desired by the separation and contact of a cylinder driven by an air cylinder using a mechanical shut mechanism Process,
A coolant replenishing step of replenishing the coolant reduced by defoaming to a predetermined water level of the coupler ;
A method for producing a liquid-cooled cathode ray tube, comprising: Coupler liquid leakage inspection means for injecting air into a cathode ray tube coupler and measuring air pressure to inspect the liquid leakage in the coupler;
A coolant injection means for injecting a coolant into the coupler;
A plurality of defoamers that removes the air present in the coupler by vacuum suction after injecting the coolant using an on-off valve that can be opened and closed as desired by separating and contacting a cylinder driven by an air cylinder using a mechanical shut mechanism Means,
A coolant replenishing means for replenishing the coolant reduced by defoaming to a predetermined water level of the coupler ;
An apparatus for producing a liquid-cooled cathode ray tube, comprising:

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