IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0796800
(2001-03-02)
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발명자
/ 주소 |
- Schaefer, John W.
- Heyman, Mark
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출원인 / 주소 |
- TA Instruments-Waters LLC
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
10 인용 특허 :
10 |
초록
▼
A liquid nitrogen cooling assembly incorporating a liquid detector which feeds back to control the nitrogen supply is disclosed. A pressure-controlled nitrogen source (e.g., a dewar) feeds liquid nitrogen to a heat exchanger mounted to a differential scanning calorimetry (DSC) cell. The DSC cell is
A liquid nitrogen cooling assembly incorporating a liquid detector which feeds back to control the nitrogen supply is disclosed. A pressure-controlled nitrogen source (e.g., a dewar) feeds liquid nitrogen to a heat exchanger mounted to a differential scanning calorimetry (DSC) cell. The DSC cell is cooled as liquid nitrogen in the heat exchanger contacting the cell is vaporized into nitrogen gas. The exhaust (nitrogen gas and, occasionally, nitrogen liquid) is fed to a liquid detection/evaporator assembly. If liquid nitrogen is detected in the exhaust by the liquid detection/evaporator assembly, an indication is fed back using a liquid detection feedback loop to a pressure control device. The pressure control device reduces the amount of pressure on the nitrogen source in order to eliminate liquid in the exhaust. When there is liquid in the exhaust, the liquid detection/evaporator assembly also collects and vaporizes the exhaust liquid so that it can be properly vented to atmosphere in gas form. When liquid is no longer detected in the exhaust, the pressure control device increases the pressure on the liquid nitrogen source until liquid is detected in the exhaust. Subsequent cycles control pressure in this manner to keep the heat exchanger full of liquid nitrogen.
대표청구항
▼
A liquid nitrogen cooling assembly incorporating a liquid detector which feeds back to control the nitrogen supply is disclosed. A pressure-controlled nitrogen source (e.g., a dewar) feeds liquid nitrogen to a heat exchanger mounted to a differential scanning calorimetry (DSC) cell. The DSC cell is
A liquid nitrogen cooling assembly incorporating a liquid detector which feeds back to control the nitrogen supply is disclosed. A pressure-controlled nitrogen source (e.g., a dewar) feeds liquid nitrogen to a heat exchanger mounted to a differential scanning calorimetry (DSC) cell. The DSC cell is cooled as liquid nitrogen in the heat exchanger contacting the cell is vaporized into nitrogen gas. The exhaust (nitrogen gas and, occasionally, nitrogen liquid) is fed to a liquid detection/evaporator assembly. If liquid nitrogen is detected in the exhaust by the liquid detection/evaporator assembly, an indication is fed back using a liquid detection feedback loop to a pressure control device. The pressure control device reduces the amount of pressure on the nitrogen source in order to eliminate liquid in the exhaust. When there is liquid in the exhaust, the liquid detection/evaporator assembly also collects and vaporizes the exhaust liquid so that it can be properly vented to atmosphere in gas form. When liquid is no longer detected in the exhaust, the pressure control device increases the pressure on the liquid nitrogen source until liquid is detected in the exhaust. Subsequent cycles control pressure in this manner to keep the heat exchanger full of liquid nitrogen. che unit of claim 1 further characterized in that the facing member is a face plate having a planar exposed surface. 3. The niche unit of claim 1 further characterized in that the exterior facing member is assembleable and disassembleable to the niche. 4. The niche unit of claim 1 further characterized in that the means for connecting the facing member to the niche assembly are a plurality of spring clips carried by the facing member, said spring clips being received in apertures in the upper end portions of the niche. 5. The niche unit of claim 1 further characterized by and including mechanical locking means for securing the cover to the niche. 6. A columbarium, said columbarium including, in combination, support means for a plurality of niche units, said support means including front horizontal members for supporting a plurality of horizontally aligned niche units beneath their outer, lower front end portions, and rear horizontal members for supporting said plurality of horizontally aligned niche units from locations at the rear end portions of said niche units above the bottoms thereof, and vertical support members connected to the front and rear horizontal members to form a rigid, self standing support means, and a plurality of niche units connected to the self standing support means. 7. A niche unit for a columbarium, said niche unit including a niche assembly consisting of a niche, a cover for the niche, and means for creating a less than atmospheric pressure within the niche assembly when the niche cover is sealingly secured to the niche, and an exterior facing member, said exterior facing member being connectable to the niche assembly by connecting means which firstly, permits repeated assembly and disassembly of the facing member to the niche assembly prior to activation of the niche unit, and secondly, permanently secures the facing member to the niche assembly upon activation of the niche unit. 8. The niche unit of claim 7 further characterized in that the means for creating a less than atmospheric pressure in the niche assembly is a valve in the niche cover accessible from the outside of the niche assembly in the absence of the facing member. 9. A niche unit for a columbarium, said niche unit including a niche assembly consisting of a niche and a cover for the niche, and an exterior facing member, said exterior facing member being connectable to the niche assembly by connecting means which firstly, permits repeated assembly and disassembly of the facing member to the niche assembly prior to activation of the niche unit, and secondly, permanently secures the facing member to the niche assembly upon activation of the niche unit, the means for connecting the facing member to the niche assembly being a plurality of spring clips carried by the facing member, said spring clips being received in apertures in the outer end portions of the niche, the facing member being engageable with the niche in two relative positions of the facing member and niche, said facing member, when in the first position, enabling the spring clips to be easily assembleable to and disassembleable from the niche, and when in the second position, causing the facing member to be permanently locked to the niche. 10. The niche unit of claim 9 further characterized in that the facing member is rectangular in configuration. 11. The niche unit of claim 10 further characterized in that the facing member is square in configuration. 12. A columbarium, said columbarium including, in combination, support means for a plurality of niche units, said support means including front horizontal members for supporting a plurality of horizontally aligned niche units beneath their outer, lower front end portions, and rear horizontal members for supporting said plurality of horizontally aligned niche units from locations at the rear end portions of the said niche units, and vertical support membe rs connected to the front and rear horizontal members to form a rigid, self standing support means, and a plurality of niche units connected to the self standing support means, characterized firstly, in that each niche unit includes a niche assembly consisting of a niche and cover for the niche, and secondly, in that the closed bottom of the niche has a concave depression therein, said concave depression being arranged to receive an associated rear horizontal member of the support means in snug supporting relationship with the rear of the niche. 13. The columbarium of claim 12 further characterized by and including front vertical members, said front vertical members being part of the niche unit support means, and means for connecting the front portion of each niche unit to the front vertical members in rigid relationship whereby each niche unit is independently secured to the niche unit support means in fixed relationship to said support means and other niche units. 14. The columbarium of claim 13 further characterized in that the niche and niche cover form a niche assembly, and further including an exterior facing member, said exterior facing member being connectable to the niche assembly by connecting means which firstly, permits repeated assembly and disassembly of the facing member to the niche assembly prior to activation of the niche unit, and secondly, permanently secures the facing member to the niche assembly upon activation of the niche unit. 15. A columbarium, said columbarium including in combination, support means for rigidly supporting a plurality of niche units, said support means including front horizontal members for supporting a plurality of horizontally aligned niche units at their outer, lower front portions, rear horizontal members which engage and support each of said plurality of horizontally aligned niche units at the locations at the rear end portions of each of said niche units and between the tops and bottoms of each of said niche units, vertical support members connected to the front horizontal members, only two rear vertical support members connected to the rear horizontal members, one at each end of the plurality of horizontally aligned niche units, which fixedly space the rear horizontal members from one another and form a rigid, self-standing support means, and a plurality of niche, wits connected to the self-standing support means. 16. The columbarium of claim 15 further characterized in that the rear portion of each of the niche units has a depression formed therein which abuttingly contacts an associated rear horizontal member in fixed relationship. 17. The columbarium of claim 16 further characterized in that the depression in each niche unit is generally U-shaped in cross section and is located above the lower portion of the niche unit. 18. In a niche assembly consisting of a niche and a cover for the niche, a facing member for the niche assembly, said facing member being engageable with the niche assembly in two relative positions of the facing member and the niche assembly, said facing member, when in one position, being easily assembleable and disassembleable from the niche assembly and when in another position, causing the facing member to be permanently locked to the niche assembly. 19. The niche assembly of claim 18 further characterized in that the facing member is engageable with the niche. 20. The niche assembly of claim 19 further characterized in that the engagement of the facing member to the niche assembly is by spring clip means. 21. The niche assembly of claim 20 further characterized in that the spring clip means includes a spring clip and a receiving aperture therefor, said spring clip and receiving aperture being assembleable to one another in two different orientations. 22. The niche assembly of claim 21 further characterized in that the spring clip is carried by the facing member and the receiving ap erture is formed in the niche assembly. 23. The niche assembly of claim 22 further characterized in that the niche includes flange means, said receiving aperture being formed in said flange means. 24. In a columbarium system comprising a plurality of niche assemblies and a support structure for said niche assemblies, said niche assemblies forming a columbarium wherein each niche assembly includes a niche, a cover means for said niche, bottom means for said niche opposite said cover means, said bottom means having a concave depression adapted, when seated in a fixed, elongated horizontal support member of the support structure to support the bottom means in a vertical orientation. 25. The niche of claim 24 further characterized in that said bottom means includes two concave depressions, said concave depressions being located substantially perpendicular to one another each of said concave depressions being adapted to be assembled to a support member whereby said niche can be assembled in two different positions with respect to the fixed support member. 26. The niche of claim 25 further characterized in that the concave depressions are molded into the bottom means of the niche.
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