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公开(公告)号：US11815432B2
公开(公告)日：2023-11-14
申请号：US17273442
申请日：2019-07-18
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama
CPC classification number: G01N30/66 , G01N30/12 , G01N2030/025 , G01N2030/126
Abstract: A thermal conductivity detector includes a first pipe path that houses a filament, a second pipe path and a third pipe path that connects the first pipe path to the second pipe path. In the third pipe path, first, second and third gas lead-in portions are arranged in this order from the first pipe path toward the second pipe path. A carrier gas is led to the first and third gas lead-in portions alternately, and a sample gas is led to the second gas lead-in portion. The distance between the second and third gas lead-in portions is equal to or smaller than 1.3 times of a maximum dimension of an opening formed at the second gas lead-in portion. At least part of the third pipe path between the second gas lead-in portion and the third gas lead-in portion has a cross sectional area that is equal to or smaller than an area of the opening formed at the second gas lead-in portion.
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公开(公告)号：US11428676B2
公开(公告)日：2022-08-30
申请号：US16543781
申请日：2019-08-19
Applicant: Shimadzu Corporation
Inventor： Yuji Nakama
Abstract: An upstream portion of a flow path is stored in a cell block. A filament for detecting thermal conductivity of a sample gas is stored in the upstream portion. The sample gas is led to a downstream portion of an exhaust pipe path through the flow path. The flow path is kept warm by a temperature retainer such that the temperature of the sample gas that passes through the exhaust pipe path does not decrease to a temperature equal to or lower than a liquefaction temperature of the sample gas. Alternatively, at least one portion including a downstream end of the exhaust pipe path is provided to be attachable to and detachable from another portion of the flow path.
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公开(公告)号：US10458961B2
公开(公告)日：2019-10-29
申请号：US15665753
申请日：2017-08-01
Applicant: Shimadzu Corporation
Inventor： Yuji Nakama , Shigeaki Shibamoto , Minoru Kashihara
Abstract: Provided is a gas chromatograph including a column which separates a sample; a detector which is configured to alternately introduce a carrier gas containing a sample component separated by the column and a carrier gas alone into a detection unit by changing an inflow point of the carrier gas to acquire a signal; an analysis information input unit with which analysis information is input; a data retaining unit which retains data indicating a relationship between a column flow rate and a carrier gas flow rate which is obtained in advance; and calculation unit which is configured to calculate the carrier gas flow rate on the basis of the analysis information input from the analysis information input unit and calculate the carrier gas flow rate according to the calculated column flow rate by using the calculated column flow rate and the data retained in the data retaining unit.
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公开(公告)号：US20160103105A1
公开(公告)日：2016-04-14
申请号：US14870208
申请日：2015-09-30
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama , Shigeaki Shibamoto , Kazunori Takahashi , Minoru Kashihara
Abstract: A thermal conductivity detector that causes a fluid to come into contact with the surface of a heated temperature sensing element, that causes the temperature of the temperature sensing element to change according to the thermal conductivity of the fluid, and that detects the fluid based on a change in the electrical resistance of the temperature sensing element at that time or on a change in the value of a current to be applied to the temperature sensing element is provided. The thermal conductivity detector includes a cell space where the temperature sensing element is accommodated and to which a fluid is introduced and from which the fluid is discharged, a buffer space that is connected to a fluid outlet of the cell space, and a discharge channel that is connected to a fluid outlet of the buffer space.
Abstract translation: 一种热导率检测器，其导致流体与加热的温度感测元件的表面接触，其导致温度感测元件的温度根据流体的热导率而改变，并且基于 提供了当时的温度感测元件的电阻的变化或者要施加到感温元件的电流值的变化。 热传导检测器包括容纳温度感测元件并且流体被引入并且流体被排出的单元空间，连接到电池空间的流体出口的缓冲空间和排出通道， 连接到缓冲空间的流体出口。
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公开(公告)号：US11243180B2
公开(公告)日：2022-02-08
申请号：US16760599
申请日：2017-12-19
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama
Abstract: Provided is a thermal conductivity detector including a detection channel through which a gas to be measured flows as a fluid, a heat conducting part that includes at least a filament provided at a position in the detection channel at which the filament is in direct contact with the fluid flowing through the detection channel, the filament being folded at least once in a direction substantially parallel to a flow direction of the fluid flowing through the detection channel, and that conducts heat via the fluid flowing through the detection channel, and a detection circuit that detects an electric signal in accordance with a change in current or voltage of the filament. The filament is folded by being holed on a folding pin provided substantially perpendicular to the flow direction in the detection channel, and the folding pin has a position shift prevention structure for preventing a fold of the filament hooked on the folding pin from shifting in a longitudinal direction of the folding pin.
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Patent Agency Ranking
公开(公告)号：US10274447B2
公开(公告)日：2019-04-30
申请号：US15665712
申请日：2017-08-01
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama
Abstract: Detection sensitivity of a single-filament thermal conductivity detector is to be increased. A thermal conductivity detector is a single-filament thermal conductivity detector, and includes a measurement cell, a phase switching mechanism, and a measurement section. The measurement section starts measurement of thermal conductivity of a sample gas after a lapse of a sample gas measurement start time that is set in advance, after a reference phase is switched to a sample phase by the phase switching mechanism, and starts measurement of thermal conductivity of a reference gas after a lapse of a reference gas measurement start time that is set in advance as a length of time different from the sample gas measurement start time, after the sample phase is switched to the reference phase by the phase switching mechanism.
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公开(公告)号：US12292421B2
公开(公告)日：2025-05-06
申请号：US18082912
申请日：2022-12-16
Applicant: Shimadzu Corporation
Inventor： Kasumi Sasaki , Yuji Nakama
Abstract: Provided is a gas chromatograph capable of efficiency circulating air in a column oven. The gas chromatograph is provided with a column oven, a heater, a fan, and a cylindrical member. The column oven accommodates a column. The heater heats the inside of the column oven. The fan has a blade that rotates about a rotation axis in the column oven, and sends air toward the column provided in the axial direction that is a direction along the rotation axis. The cylindrical member is arranged to accommodate at least a part of the fan in a state of being spaced apart from the column in the axial direction and surrounding an outer periphery of the fan along a rotational direction of the blade.
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公开(公告)号：US10330651B2
公开(公告)日：2019-06-25
申请号：US14870208
申请日：2015-09-30
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama , Shigeaki Shibamoto , Kazunori Takahashi , Minoru Kashihara
Abstract: A thermal conductivity detector that causes a fluid to come into contact with the surface of a heated temperature sensing element, that causes the temperature of the temperature sensing element to change according to the thermal conductivity of the fluid, and that detects the fluid based on a change in the electrical resistance of the temperature sensing element at that time or on a change in the value of a current to be applied to the temperature sensing element is provided. The thermal conductivity detector includes a cell space where the temperature sensing element is accommodated and to which a fluid is introduced and from which the fluid is discharged, a buffer space that is connected to a fluid outlet of the cell space, and a discharge channel that is connected to a fluid outlet of the buffer space.
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公开(公告)号：US20180067068A1
公开(公告)日：2018-03-08
申请号：US15665712
申请日：2017-08-01
Applicant: SHIMADZU CORPORATION
Inventor： Yuji Nakama
CPC classification number: G01N27/18 , G01N25/18 , G01N30/66 , G01N2030/025 , G01N2030/126
Abstract: Detection sensitivity of a single-filament thermal conductivity detector is to be increased. A thermal conductivity detector is a single-filament thermal conductivity detector, and includes a measurement cell, a phase switching mechanism, and a measurement section. The measurement section starts measurement of thermal conductivity of a sample gas after a lapse of a sample gas measurement start time that is set in advance, after a reference phase is switched to a sample phase by the phase switching mechanism, and starts measurement of thermal conductivity of a reference gas after a lapse of a reference gas measurement start time that is set in advance as a length of time different from the sample gas measurement start time, after the sample phase is switched to the reference phase by the phase switching mechanism.
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公开(公告)号：US11268939B2
公开(公告)日：2022-03-08
申请号：US16560099
申请日：2019-09-04
Applicant: Shimadzu Corporation
Inventor： Yuji Nakama
Abstract: A thermal conductivity detector includes a first pipe passage and an exhaust pipe passage. The first pipe passage is accommodated in a cell block together with a heating device. The exhaust pipe passage has an outlet port at the downstream end, and most of the exhaust pipe passage including the downstream end is drawn out of the cell block. The heating device maintains the space in the cell block at a temperature capable of vaporizing the sample. A filament is accommodated in the first pipe passage. The gas passing through the first pipe passage is discharged out of the thermal conductivity detector through the exhaust pipe passage outlet port. On the inner surface of the exhaust pipe passage, a coating having resistance to a cleaning fluid for removing the adhered substance due to the sample gas is formed.
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