Vacuum sealing device for a dewar for a refrigeration CCD
A sealing device and vacuum technology, applied in the field of photoelectric detection, can solve the problems of difficult maintenance, complex CCD vacuum Dewar structure, etc., and achieve the effects of easy maintenance and low leakage rate
Active Publication Date: 2018-05-29
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: to provide a refrigeration CCD vacuum Dewar sealing device with the advantages of simple structure, small leakage rate and detachable, suitable for Cooling system for CCD camera
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] Such as figure 1 As shown, a refrigeration CCD vacuum Dewar sealing device includes: Dewar base 1, base 2, dynamic sealing rubber ring 3, upper cover 4, screw rod 5, screw 6, rubber ring 7, spring 8, Dewar upper cover 9 and silver wire sealing ring 10.
[0016] Assemble the Dewar's internal components such as CCD, radiation shield, signal line, and semiconductor refrigerator on the Dewar base 1 . Install the vacuum pump and vacuum gauge to the two ports on base 2.
[0017] Place the Dewar base 1 in the base 2, then place the silver wire sealing ring 10 on the corresponding position of the Dewar base 1, place the Dewar upper cover 9 on the Dewar base 1, wherein the Dewar upper cover 9 The two corners are 5-10mm more than the Dewar base 1. In this position, two springs 8 are used to prop up the Dewar upper cover 9 so that there is a gap...
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The invention discloses a vacuum sealing device for a dewar for a refrigeration CCD. The vacuum sealing device comprises a base, an upper cover, screw rods, springs, rubber rings and a dewar; a vacuumgauge and a vacuum pump are connected to the base; after internal devices of the dewar is assembled, the dewar base and a dewar upper cover are placed in the base, the dewar upper cover is supportedby the springs, and a certain gap is reserved between the dewar upper cover and the dewar base; the screw rods and the upper cover are designed to be in dynamic sealing through the rubber rings, and then the upper cover and the base are sealed by one rubber ring; a cavity is vacuumized by the vacuum pump, and fastening bolts on the dewar are tightened through the screw rods after the cavity is pre-exhausted for a period of time; and the dewar upper cover and the dewar base are sealed by using silver wires, so that the high vacuum degree inside the dewar is guaranteed. According to the vacuum sealing device, the sealing mode has the advantages of being simple in structure, low in leakage rate and detachable, and the vacuum sealing device is suitable for the field of refrigeration type CCD camera refrigeration.
Description
technical field [0001] The invention belongs to the field of photoelectric detection, in particular to a refrigeration CCD vacuum Dewar sealing device. Background technique [0002] Scientific grade CCD (charge coupled device) has a wide range of applications in astronomical observation, scientific research, industrial production and other fields. The thermally generated dark current is a key factor affecting the CCD signal-to-noise ratio and is related to the CCD operating temperature. When the CCD operating temperature is reduced by 7 to 8 degrees, the thermally generated dark current is reduced by an order of magnitude. Therefore, the CCD must be deeply monitored. Refrigeration. [0003] Limited by the performance of semiconductor refrigerators, in order to achieve deep cooling, the heat leakage of CCD must be strictly controlled to a negligible level. Therefore, the cooling CCD must be vacuum-packaged to completely eliminate the conduction heat leakage of the gas in the...
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Login to View More IPC IPC(8): F16J15/28
CPCF16J15/28
Inventor 聂山钧王明富高晓东廖靖宇
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI