Cryocooler with variable compression depending on variations in load
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0947282
(2013-07-22)
|
등록번호 |
US-9587860
(2017-03-07)
|
우선권정보 |
KR-10-2012-0079964 (2012-07-23) |
발명자
/ 주소 |
- Rhee, JuHun
- Lee, Kyung-Hwan
- Hyun, Bum-Seok
- Sim, Eunsup
|
출원인 / 주소 |
- KOREA AEROSPACE RESEARCH INSTITUTE
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
A cryocooler, includes a cylinder filled with gas. A piston rectilinearly reciprocates inside of the cylinder and compresses or expands the gas. A connecting rod has a first side coupled to the piston and moves with the piston, and a second side having a first thread along an outer circumference the
A cryocooler, includes a cylinder filled with gas. A piston rectilinearly reciprocates inside of the cylinder and compresses or expands the gas. A connecting rod has a first side coupled to the piston and moves with the piston, and a second side having a first thread along an outer circumference thereof. A linear motor rectilinearly reciprocates a motor shaft toward the connecting rod in accordance with a control signal. A sleeve has two open sides, so that an end portion of the motor shaft can be supported by and inserted in one open side, and the second side of the connecting rod can be inserted in the other open side, and an inner circumference of the sleeve is formed with a second thread that engages with the first thread of the connecting rod and rotates to adjust a distance between the motor shaft and the connecting rod.
대표청구항
▼
1. A cryocooler with variable compressions for cooling operation depending on variations in load, the cryocooler comprising: a cylinder (110) which is internally filled with gas;a piston (120) which rectilinearly reciprocates on an inner circumference of the cylinder (110) and compresses or expands
1. A cryocooler with variable compressions for cooling operation depending on variations in load, the cryocooler comprising: a cylinder (110) which is internally filled with gas;a piston (120) which rectilinearly reciprocates on an inner circumference of the cylinder (110) and compresses or expands the gas;a connecting rod (130) which comprises a first side coupled to the piston (120) and moving together with the piston (120), and a second side formed with a first thread (131) along an outer circumference thereof;a linear motor (140) which is disposed at a position opposite to a direction where the connecting rod (130) is extended, and rectilinearly reciprocates a motor shaft (141) toward the connecting rod (130) in accordance with a control signal; anda sleeve (150) which is formed in a cylindrical shape, both sides of which are opened, so that an end portion of the motor shaft (141) can be is supported by and inserted in a first open side of the sleeve (150), and the second side of the connecting rod (130) can be is inserted in a second open side of the sleeve (150), and an inner circumference of the sleeve (150) is formed with a second thread (151) to be engaged with the first thread (131) of the connecting rod (130),wherein, as the sleeve is rotated, the first thread (131) of the connecting rod (130) is guided by rotation of the second thread (151), such that a distance (D) between the end portion of the motor shaft (141) and the second side of the connecting rod (130) is adjusted. 2. A cryocooler with variable compressions for cooling operation depending on variations in load, the cryocooler comprising: a cylinder (110) which is internally filled with gas;a piston (120) which rectilinearly reciprocates on an inner circumference of the cylinder (110) and compresses or expands the gas;a connecting rod (130) which comprises a first side coupled to the piston (120) and moving together with the piston (120), and a second side formed with a first thread (131) along an outer circumference thereof;a linear motor (140) which is disposed at a position opposite to a direction where the connecting rod (130) is extended, and rectilinearly reciprocates a motor shaft (141) toward the connecting rod (130) in accordance with a control signal; anda sleeve (150) which is formed in a cylindrical shape, both sides of which are opened, so that an end portion of the motor shaft (141) is supported by and inserted in a first open side of the sleeve (150), and the second side of the connecting rod (130) is inserted in a second open side of the sleeve (150), and an inner circumference of the sleeve (150) is formed with a second thread (151) to be engaged with the first thread (131) of the connecting rod (130),wherein the connecting rod (130) moves rectilinearly together with the piston (120) relative to the sleeve (150), such that a distance (D) between the end portion of the motor shaft (141) and the second side of the connecting rod (130) is adjusted. 3. The cryocooler according to claim 1, further comprising a rotary motor (160) which is adjacent to the sleeve (150) and comprises a rotary motor shaft (161) formed with a motor shaft gear (162), wherein an outer circumference of the sleeve (150) is formed with a sleeve gear (152) engaging with and rotating together with the motor shaft gear (162). 4. The cryocooler according to claim 1, wherein a notch (142) protrudes from the end portion of the motor shaft (141) and is in contact with and supported by the inner circumference of the sleeve (150) so that the motor shaft (141) is prevented from being inserted in the sleeve (150) by a predetermined length or longer. 5. The cryocooler according to claim 4, wherein a supporting protrusion (153) protrudes from a one-side inner circumference of the sleeve (150) so that the notch (142) of the motor shaft (141) is allowed to be in contact with and supported by the supporting protrusion (153). 6. The cryocooler according to claim 5, wherein the notch (142) has an annular shape along a circumference of the end portion of the motor shaft (141). 7. The cryocooler according to claim 6, wherein one end portion of the sleeve (150) is formed with a separation-preventing protrusion (154) protruding inwardly to prevent the notch (142) of the motor shaft (141) inserted in the sleeve (150) from being separated outward from the sleeve (150). 8. The cryocooler according to claim 1, wherein a length of the second thread (151) formed on the inner circumference of the sleeve (150) is within a stroke distance of the piston (120). 9. The cryocooler according to claim 1, further comprising a controller (170) which outputs a control signal for driving control of the linear motor (140) and a rotary motor (160). 10. The cryocooler according to claim 9, wherein the rotary motor (160) comprises a step motor or a servo motor of which a rotating direction and a rotating angle is adjustable in accordance with a control signal of the controller (170).
이 특허에 인용된 특허 (4)
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Wu Yeong-Wei A. (Rancho Palos Verdes CA) Kieffer Michael H. (Redondo Beach CA), Apparatus and method for temperature control of a cryocooler by adjusting the compressor piston stroke amplitude.
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Beale William T. (Athens OH), Free piston stirling machine having a controllably switchable work transmitting linkage between displacer and piston.
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Higham Graham (Scottsdale AZ) Young Niels (Boise ID) Weeks Alan (Lunenburg MA) Michaud Steven A. (Haverhill MA) Sand William (Lexington MA), Linear drive motor with flexible coupling.
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Stoll Kurt (Esslingen DEX) Mller Lothar (Esslingen DEX), Piston and cylinder unit.
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