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公开(公告)号：US20190353276A1
公开(公告)日：2019-11-21
申请号：US16479013
申请日：2017-12-25
发明人： Takafumi ITO , Hironori ARII , Tadashi MATSUSHITA , Sze Keat CHEE , Takeshi YANO
摘要： The piezoelectric actuator includes a piezoelectric element; a power supply applying a voltage to the piezoelectric element; a drive circuit that applies a voltage from the power supply to the piezoelectric element by a pulse charge signal and a discharge signal to charge, and discharges the charge charged in the piezoelectric element to drive the piezoelectric element; an abnormality detection circuit that detects an abnormality due to insulation failure of the piezoelectric element, and a control unit that determines whether or not the piezoelectric element is normal based on an abnormality detection signal. The abnormality detection circuit outputs the abnormality detection signal that detects a time corresponding to a period from when a current starts to flow to the piezoelectric element during charging to when a current stops to flow, and it is determined that the piezoelectric element is abnormal when the time is equal to or more than a set time.
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公开(公告)号：US20220356958A1
公开(公告)日：2022-11-10
申请号：US17622620
申请日：2020-02-28
发明人： Takafumi ITO , Tadashi MATSUSHITA , Toshiro HIGUCHI , Sze Keat CHEE , Yoshinobu MIZUNO , Toshitada HIRATA
摘要： A piezoelectric valve includes: a valve main part including a gas pressure chamber receiving compressed gas supplied from outside; a plate inside the valve main part, and an actuator fixed to the plate and inside the valve main part, which is a case with an opening on a front surface. The plate includes a gas discharge path and a valve seat coming into contact with a valve element of the actuator opening and closing the gas discharge path. A lid member that closes the opening of the case has a gas discharge opening communicating with the gas discharge path of the plate; is welded and fixed to a front surface of the plate, where the gas discharge path opens, on an annular welded part surrounding the gas discharge opening; and is welded and fixed to an end surface of the case on an annular welded part on the outer peripheral part.
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3.发明申请公开(公告)号：US20220316617A1
公开(公告)日：2022-10-06
申请号：US17615653
申请日：2020-03-06
发明人： Takafumi ITO , Tadashi MATSUSHITA , Toshiro HIGUCHI , Sze Keat CHEE , Kunio EBIHARA , Toshitada HIRATA
摘要： Provided is a piezoelectric actuator that can reduce a risk of air leakage due to weakening of pressing force of a valve element against a valve seat surface and airtightness. The piezoelectric actuator is used for a piezoelectric valve that opens and closes a valve utilizing displacement of a laminated piezoelectric element. The piezoelectric actuator includes: a valve element; a laminated piezoelectric element that generates a driving force, required for operation of the valve element, as a displacement; and a displacement enlargement mechanism that enlarges a displacement of a laminated piezoelectric element and causes the enlarged displacement to act on the valve element. In the piezoelectric actuator, a surface of the valve element to be in contact with a valve seat of the piezoelectric valve is made flat and smooth in a state in which a tensile load is applied to the laminated piezoelectric element.
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公开(公告)号：US20220213973A1
公开(公告)日：2022-07-07
申请号：US17605914
申请日：2020-01-22
IPC分类号： F16K31/00 , H01L41/053 , H01L41/083
摘要： Provided is a piezoelectric valve in which the valve is opened/closed utilizing a displacement of a laminated piezoelectric element, including: a valve main body having a gas pressure chamber that receives compressed gas supplied externally; and an actuator having a valving element, the laminated piezoelectric element that generates a driving force required for operating the valving element as the displacement, and a displacement enlarging mechanism that enlarges the displacement of the laminated piezoelectric element to be acted on the valving element, the actuator being disposed in the valve main body, in which a surface of the laminated piezoelectric element is coated with silicone in a state in which the laminated piezoelectric element is integrated into the actuator.
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公开(公告)号：US20240019040A1
公开(公告)日：2024-01-18
申请号：US18039340
申请日：2021-11-30
发明人： Takafumi ITO , Sze Keat CHEE
CPC分类号： F16K31/004 , F16K27/003
摘要： A piezoelectric valve including actuators that are respectively adapted to drive valve elements, and a valve body including a gas inlet port, and a plurality of gas outlet ports, the piezoelectric valve is attachable to and detachable from a fluid device via a connector unit including an inlet passage that is communicable at one end with the gas inlet port, and is communicable at another end with an air supply passage of the fluid device, and a plurality of discharge passages that are respectively communicable at one end with the plurality of gas outlet ports, and are respectively communicable at another end with a plurality of gas outlet passages of the fluid device, and a pitch of openings of the plurality of discharge passages on the other end side is greater than a pitch of openings of the plurality of discharge passages on the one end side.
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公开(公告)号：US20240011573A1
公开(公告)日：2024-01-11
申请号：US18025463
申请日：2021-09-10
发明人： Takafumi ITO , Sze Keat CHEE
IPC分类号： F16K31/00
CPC分类号： F16K31/004
摘要： A piezoelectric valve including an actuator that drives a valve body; a valve seat plate including a valve seat that is adapted to be positioned in contact with and away from the valve body, and a discharge passage; and a body case that houses the valve seat plate, in which the actuator includes a proximal portion fixed to the valve seat plate, a piezoelectric element having one end portion connected to an attachment face of the proximal portion and extending in a first longitudinal direction, a support portion integrally formed with the proximal portion, the support portion being arranged side-by-side with the piezoelectric element and extending in a second longitudinal direction crossing the first longitudinal direction, an operating portion connected to another end portion of the piezoelectric element and to a distal end portion of the support portion.
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公开(公告)号：US20190093784A1
公开(公告)日：2019-03-28
申请号：US16082664
申请日：2017-01-24
发明人： Takafumi ITO , Hironori ARII , Tadashi MATSUSHITA , Sze Keat CHEE , Takeshi YANO , Toshiro HIGUCHI
摘要： A piezoelectric valve, having superior responsiveness during valve opening and capability to stabilize gas supply at an early stage, includes a gas pressure chamber receiving compressed gas and an exhaust path discharging the compressed gas from the gas pressure chamber; a valve disc placed in the gas pressure chamber to open and close the exhaust path; a piezoelectric element generating a driving force for operation of the valve disc, as a displacement; a displacement magnifying mechanism magnifying the displacement of the piezoelectric element and applying the magnified displacement to the valve disc; and driving means including a signal generator generating a signal including a first prepulse, a second prepulse, and a main pulse, applies a drive voltage to the piezoelectric element using the signal generated by the signal generator, as an input signal to a drive circuit, and drives and opens the valve disc by expanding the piezoelectric element.
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公开(公告)号：US20170312790A1
公开(公告)日：2017-11-02
申请号：US15531823
申请日：2015-11-18
CPC分类号： B07C5/366 , B07C5/342 , B07C5/3422 , B07C5/3425 , B07C5/36 , B07C5/368
摘要： An ejector for a granular matter color sorter reducing burdens such as cleaning and maintenance in particular associated with a nozzle unit is to be provided. The ejector 10 comprises a nozzle unit 15, a solenoid valve unit 13, and a manifold unit 14. The nozzle unit 15 is constituted by a plurality of nozzle devices 16 that are independent from each other. The solenoid valve unit 13 is constituted by a plurality of solenoid valve devices 19. The respective nozzle devices 16 and the respective solenoid valve devices 19 correspond to each other on a one-on-one basis so that air flow passages of them are connected by an air flow passage of a manifold. The nozzle device 16 and the manifold 29 are detachably connected and made integral in a state where a surface of the nozzle device 16 in which the air flow passage opens and a surface of the manifold 29 in which the air flow passage opens are brought into abutment with each other.
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公开(公告)号：US20130256200A1
公开(公告)日：2013-10-03
申请号：US13907629
申请日：2013-05-31
CPC分类号： B07C5/366 , B07B4/02 , B07C5/3422 , B07C5/3425 , B07C5/365 , F16K31/004 , Y10S209/938
摘要： An optical granular material-sorting apparatus includes: a transfer means for transferring objects being sorted; an optical detection means for detecting, at a detection position, objects being sorted as they drop from an end of the transfer means; and a blasting means provided below the optical detection means and designed to blow away objects being sorted through blasting of air based on the result of detection by the optical detection means. The blasting means has a piezoelectric valve which is driven by a driving means to blast air based on the result of detection by the optical detection means. The driving means applies voltage to a piezoelectric element in multiple stages so as to suppress fluctuation in the amount of gas ejected from a gas release channel when the valve opens.
摘要翻译： 光学粒状材料分选装置包括：转印装置，用于转印被分类的物体; 光检测装置，用于在检测位置检测从所述传送装置的端部落下的物体; 以及设置在所述光学检测装置的下方的喷射装置，其被设计成基于所述光学检测装置的检测结果来吹扫被喷射的空气分类的物体。 爆破装置具有压电阀，其由驱动装置驱动，以根据光检测装置的检测结果来鼓风。 驱动装置以多级对压电元件施加电压，以便抑制当阀打开时从气体释放通道喷出的气体量的波动。
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10.发明申请公开(公告)号：US20180250714A1
公开(公告)日：2018-09-06
申请号：US15758158
申请日：2016-09-05
申请人： SATAKE CORPORATION
发明人： Takafumi ITO , Sze Keat CHEE
摘要： The present invention has an object to provide a blowing apparatus wherein a piezoelectric element is unlikely to cause insulation deterioration leading to burnout during use of the blowing apparatus. The blowing apparatus of the present invention blows compressed gas supplied from a compressed gas supply unit through a nozzle hole of a nozzle unit by opening a piezoelectric valve. The blowing apparatus comprises a humidity sensor detecting a humidity of the compressed gas inside a flow path unit, and a humidity control unit comparing a detected value of the humidity detected by the humidity sensor with a set value. If the humidity of the compressed gas inside the flow path unit detected by the humidity sensor is equal to or greater than the set value, the humidity control unit replaces the compressed gas inside the flow path unit with the compressed gas whose humidity is less than the set value and which is supplied from the compressed gas supply unit, before starting to use the blowing apparatus.
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