Patents by Inventor Hiromi Ohta
Hiromi Ohta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10240835Abstract: A pilot on-off valve in a refrigeration cycle device includes a main on-off valve that opens or closes a bypass passage through which a high-pressure side portion and a low-pressure side portion of a cycle communicate with each other, and a pilot valve that opens or closes a communication passage through which an inflow port and an outflow port of the pilot on-off valve communicate with each other. When the main on-off valve opens the bypass passage, the pilot valve opens the communication passage in a state where a refrigerant passage, in which a refrigerant flowing out of the pilot on-off valve flows, is closed.Type: GrantFiled: September 2, 2013Date of Patent: March 26, 2019Assignee: DENSO CORPORTIONInventor: Hiromi Ohta
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Patent number: 10240831Abstract: A power element has a closed space provided between a first diaphragm and a second diaphragm. An interposing member is interposed between the first diaphragm and the second diaphragm. Accordingly, a size of the closed space can be optionally determined in accordance with a shape such as a thickness of the interposing member. Therefore, limitations on the size of the closed space due to a shape of the first diaphragm and the second diaphragm can be reduced. Accordingly, limitations on the size of a fluid enclosing space due to a shape of a diagram can be reduced.Type: GrantFiled: September 2, 2014Date of Patent: March 26, 2019Assignee: DENSO CORPORATIONInventors: Shigeki Ito, Ryu Fukushima, Hiromi Ohta
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Patent number: 9696070Abstract: A flow rate regulation valve is used for a refrigeration cycle device for air conditioning. The flow rate regulation valve is constituted by: an inlet flow rate control valve connected to the inlet side of an inside evaporator and functioning in the refrigeration cycle device as an expansion valve for depressurizing and expanding a refrigerant flowing into the inside evaporator; and an outlet flow rate adjustment valve connected to the outlet side of the inside evaporator and functioning as an evaporation pressure adjustment valve for adjusting evaporation pressure in the inside evaporator to a predetermined target pressure at which frost is not formed. The flow rate regulation valve is characterized in that, when the opening of one of the inlet flow rate control valve and the outlet flow rate adjustment valve increases, the flow rate regulation valve displaces so that the opening of the other decreases.Type: GrantFiled: April 30, 2013Date of Patent: July 4, 2017Assignee: DENSO CORPORATIONInventor: Hiromi Ohta
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Publication number: 20160223232Abstract: A power element has a closed space provided between a first diaphragm and a second diaphragm. An interposing member is interposed between the first diaphragm and the second diaphragm. Accordingly, a size of the closed space can be optionally determined in accordance with a shape such as a thickness of the interposing member. Therefore, limitations on the size of the closed space due to a shape of the first diaphragm and the second diaphragm can be reduced. Accordingly, limitations on the size of a fluid enclosing space due to a shape of a diagram can be reduced.Type: ApplicationFiled: September 2, 2014Publication date: August 4, 2016Applicant: DENSO CORPORATIONInventors: Shigeki ITO, Ryu FUKUSHIMA, Hiromi OHTA
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Publication number: 20150260439Abstract: A pilot on-off valve in a refrigeration cycle device includes a main on-off valve that opens or closes a bypass passage through which a high-pressure side portion and a low-pressure side portion of a cycle communicate with each other, and a pilot valve that opens or closes a communication passage through which an inflow port and an outflow port of the pilot on-off valve communicate with each other. When the main on-off valve opens the bypass passage, the pilot valve opens the communication passage in a state where a refrigerant passage, in which a refrigerant flowing out of the pilot on-off valve flows, is closed.Type: ApplicationFiled: September 2, 2013Publication date: September 17, 2015Inventor: Hiromi Ohta
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Publication number: 20150135749Abstract: A flow rate regulation valve is used for a refrigeration cycle device for air conditioning. The flow rate regulation valve is constituted by: an inlet flow rate control valve connected to the inlet side of an inside evaporator and functioning in the refrigeration cycle device as an expansion valve for depressurizing and expanding a refrigerant flowing into the inside evaporator; and an outlet flow rate adjustment valve connected to the outlet side of the inside evaporator and functioning as an evaporation pressure adjustment valve for adjusting evaporation pressure in the inside evaporator to a predetermined target pressure at which frost is not formed. The flow rate regulation valve is characterized in that, when the opening of one of the inlet flow rate control valve and the outlet flow rate adjustment valve increases, the flow rate regulation valve displaces so that the opening of the other decreases.Type: ApplicationFiled: April 30, 2013Publication date: May 21, 2015Inventor: Hiromi Ohta
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Patent number: 7797955Abstract: A supercritical cycle comprises an evaporator, a compressor, a gas cooler and a main valve portion of an expansion valve arranged in that order. An internal heat exchanger is arranged for exchanging heat between the high-pressure side refrigerant flowing toward the main valve portion of the expansion valve from the gas cooler and the low-pressure side refrigerant flowing toward the compressor from the evaporator. The expansion valve is formed integrally with a temperature sensing portion for controlling the main valve portion, and includes a bypass for supplying the refrigerant to the temperature sensing portion from the upstream side of the internal heat exchanger in which the high-pressure side refrigerant flows and an orifice for supplying the refrigerant from the temperature sensing portion to the refrigerant circuit downstream of the main valve portion.Type: GrantFiled: March 29, 2007Date of Patent: September 21, 2010Assignee: Denso CorporationInventor: Hiromi Ohta
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Patent number: 7621151Abstract: A pressure control valve has a temperature sensing portion. The temperature sensing portion includes a diaphragm and a cap member. A peripheral portion of the diaphragm is fixed to a peripheral portion of the cap member. One surface of the diaphragm and the cap member define a sealed space in which gas is airtightly filled. The other surface of the diaphragm is fixed to one end of the valve body, and subjected to fluid in a fluid chamber. A change of the temperature of the fluid changes a volume of the gas in the sealed space to displace the diaphragm and the valve body to open and close a valve port. A reinforcement member reinforces a fixture of the cap member to the diaphragm.Type: GrantFiled: April 3, 2007Date of Patent: November 24, 2009Assignee: Denso CorporationInventor: Hiromi Ohta
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Patent number: 7607315Abstract: A pressure control valve includes a valve portion disposed in a passage from a refrigerant radiator to a suction port of a refrigerant compressor in a vapor-compression refrigerant cycle system. The valve portion controls a refrigerant pressure at an outlet of the refrigerant radiator in accordance with a refrigerant temperature at the outlet of the refrigerant radiator, and the valve portion has a control pressure characteristic in which a pressure change relative to a temperature is smaller than that of the refrigerant. Furthermore, the valve portion may have a fluid passage through which refrigerant flows even when a valve port of the valve portion is closed by a valve body. Accordingly, when the refrigerant radiator is used for heating a fluid, heating capacity for heating the fluid can be rapidly increased at a heating start time.Type: GrantFiled: June 7, 2005Date of Patent: October 27, 2009Assignee: Denso CorporationInventor: Hiromi Ohta
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Patent number: 7559206Abstract: A supercritical heat pump cycle system includes a low-pressure determining unit for determining a pressure of a low-pressure refrigerant after being decompressed in a decompression unit, a target temperature setting unit for setting a target temperature of the fluid, and a target pressure determining unit for determining a heating target control pressure in a refrigerant radiator based on the pressure of the low-pressure refrigerant and the target temperature of the fluid during the heating operation. In the supercritical heat pump cycle system, the decompression unit is controlled so that a refrigerant pressure in the refrigerant radiator becomes the heating target control pressure. Accordingly, heating capacity of the refrigerant radiator can be effectively increased.Type: GrantFiled: June 20, 2005Date of Patent: July 14, 2009Assignee: Denso CorporationInventor: Hiromi Ohta
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Patent number: 7536872Abstract: A high pressure control valve is arranged in a refrigerant passage formed from an internal heat exchanger to an evaporator 4 in a refrigerating cycle of CO2 refrigerant having the internal heat exchanger 8. The high pressure control valve 3, 3A to 3F controls refrigerant pressure on the internal heat exchanger outlet side according to a temperature of the refrigerant at the outlet of the radiator. Into a temperature sensing section (airtightly closed space A), the inner pressure of which is changed according to the refrigerant temperature on the radiator outlet side, CO2 refrigerant, the charging density of which is 200 to 600 kg/m3, preferably 200 to 450 kg/m3, is charged.Type: GrantFiled: November 6, 2006Date of Patent: May 26, 2009Assignee: Denso CorporationInventors: Hiromi Ohta, Nobuharu Kakehashi
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Publication number: 20080314071Abstract: A supercritical refrigeration cycle system (10) having a simplified flow path configuration comprises a compressor (1) for sucking in and compressing a refrigerant, a radiator (2) for radiating the heat of the high-pressure refrigerant discharged from the compressor (1), a high-pressure control valve (5) and a superheat control valve (12) into which the high-pressure refrigerant flowing out of the radiator (2) flows after being distributed, a first evaporator (6) for evaporating the influent refrigerant decompressed by the high-pressure control valve (5), and a second evaporator (9) for evaporating the influent refrigerant decompressed by the superheat control valve (12). The outlet of the second evaporator (9) and the inlet of the first evaporator (6) are connected to each other by the refrigerant path (13) in such a manner that the refrigerant flowing out of the second evaporator (9) flows into the first evaporator (6).Type: ApplicationFiled: August 22, 2006Publication date: December 25, 2008Applicant: DENSO CorporationInventors: Hiromi Ohta, Yoshinori Murase
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Patent number: 7467525Abstract: A supercritical refrigeration cycle system (10) having a simplified flow path configuration comprises a compressor (1) for sucking in and compressing a refrigerant, a radiator (2) for radiating the heat of the high-pressure refrigerant discharged from the compressor (1), a high-pressure control valve (5) and a superheat control valve (12) into which the high-pressure refrigerant flowing out of the radiator (2) flows after being distributed, a first evaporator (6) for evaporating the influent refrigerant decompressed by the high-pressure control valve (5), and a second evaporator (9) for evaporating the influent refrigerant decompressed by the superheat control valve (12). The outlet of the second evaporator (9) and the inlet of the first evaporator (6) are connected to each other by the refrigerant path (13) in such a manner that the refrigerant flowing out of the second evaporator (9) flows into the first evaporator (6).Type: GrantFiled: August 22, 2006Date of Patent: December 23, 2008Assignee: Denso CorporationInventors: Hiromi Ohta, Yoshinori Murase
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Patent number: 7434419Abstract: A pressure control valve of a supercritical refrigeration cycle small in size and resistant to the effects of the outside air temperature, that is, a pressure control valve of a vapor compression type supercritical refrigeration cycle wherein a refrigerant is sealed in a sealed space at the top of the diaphragm, pressure of the refrigerant in the refrigeration cycle acts on the valve connected to the diaphragm, the valve opens and closes in accordance with the balance between the refrigerant pressure in the sealed space and the refrigerant in the refrigeration cycle, the sealed space is communicated with locations substantially having temperature sensing functions detecting the refrigerant temperature, and the volume of the locations substantially having the temperature sensing functions is at least 50% of the total volume of communicated with the sealed space.Type: GrantFiled: November 6, 2006Date of Patent: October 14, 2008Assignee: Denso CorporationInventors: Hiromi Ohta, Nobuharu Kakehashi
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Patent number: 7334430Abstract: A plurality of evaporators 5, 11 for evaporating an refrigerant at low pressure, which has passed through pressure reducing means 4, 10, are provided, an accumulator 9 is provided on the outlet side of one evaporator 5, an internal heat exchanger 3 is provided on the outlet side of the accumulator 9, the outlet side of another evaporator 11 is joined to a portion between the outlet side of the accumulator 9 and the inlet side of the internal heat exchanger 3, and the pressure reducing means 10 at the evaporator 11 side is composed of a fixed throttle.Type: GrantFiled: December 14, 2005Date of Patent: February 26, 2008Assignee: DENSO CorporationInventors: Nobuharu Kakehashi, Hiromi Ohta
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Publication number: 20080011363Abstract: In a pressure controlling valve 3 for causing deformation of a resilient member 32 by a pressure difference between a CO2 gas pressure in a sealed space (heat sensitive portion) corresponding to a refrigerant temperature and a high pressure of the CO2 refrigerant in the refrigeration cycle to open and close the valve, a volume ratio Vs/(Vs?Vo) of a total volume (Vs) of the sealed space when the valve is fully closed and a total volume (Vo) of the sealed space when the valve is fully open is greater than 1.9 or 2.4. To improve this volume ratio, a cavity 31d communicating with the sealed space is formed inside a displacement transmission member 31 coupled with the resilient member, or a recess portion 35a is formed in a cover member 35a, or a member communicating with the sealed space is connected.Type: ApplicationFiled: July 10, 2007Publication date: January 17, 2008Applicants: DENSO Corporation, Fujikoki CorporationInventors: Hiromi Ohta, Nobuharu Kakehashi, Ryo Matsuda, Shu Yanagisawa
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Publication number: 20070227183Abstract: A pressure control valve has a temperature sensing portion. The temperature sensing portion includes a diaphragm and a cap member. A peripheral portion of the diaphragm is fixed to a peripheral portion of the cap member. One surface of the diaphragm and the cap member define a sealed space in which gas is airtightly filled. The other surface of the diaphragm is fixed to one end of the valve body, and subjected to fluid in a fluid chamber. A change of the temperature of the fluid changes a volume of the gas in the sealed space to displace the diaphragm and the valve body to open and close a valve port. A reinforcement member reinforces a fixture of the cap member to the diaphragm.Type: ApplicationFiled: April 3, 2007Publication date: October 4, 2007Applicant: DENSO CorporationInventor: Hiromi Ohta
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Publication number: 20070227165Abstract: A supercritical cycle comprises an evaporator 41, a compressor 33, a gas cooler 35 and a main valve portion 39 of an expansion valve 37 arranged in that order. An internal heat exchanger 45 is arranged for exchanging heat between the high-pressure side refrigerant flowing toward the main valve portion 39 of the expansion valve 37 from the gas cooler 35 and the low-pressure side refrigerant flowing toward the compressor 33 from the evaporator 41. The expansion valve 37 is formed integrally with a temperature sensing portion 47 for controlling the main valve portion 39, and includes a bypass 51 for supplying the refrigerant to the temperature sensing portion 47 from the upstream side of the internal heat exchanger 45 in which the high-pressure side refrigerant flows and an orifice 53 for supplying the refrigerant from the temperature sensing portion 47 to the refrigerant circuit downstream of the main valve portion 39.Type: ApplicationFiled: March 29, 2007Publication date: October 4, 2007Applicant: DENSO CorporationInventor: Hiromi Ohta
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Publication number: 20070107462Abstract: A pressure control valve of a supercritical refrigeration cycle small in size and resistant to the effects of the outside air temperature, that is, a pressure control valve of a vapor compression type supercritical refrigeration cycle wherein a refrigerant is sealed in a sealed space at the top of the diaphragm, pressure of the refrigerant in the refrigeration cycle acts on the valve connected to the diaphragm, the valve opens and closes in accordance with the balance between the refrigerant pressure in the sealed space and the refrigerant in the refrigeration cycle, the sealed space is communicated with locations substantially having temperature sensing functions detecting the refrigerant temperature, and the volume of the locations substantially having the temperature sensing functions is at least 50% of the total volume of communicated with the sealed space.Type: ApplicationFiled: November 6, 2006Publication date: May 17, 2007Applicant: DENSO CorporationInventors: Hiromi Ohta, Nobuharu Kakehashi
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Publication number: 20070107461Abstract: A high pressure control valve is arranged in a refrigerant passage formed from an internal heat exchanger to an evaporator 4 in a refrigerating cycle of CO2 refrigerant having the internal heat exchanger 8. The high pressure control valve 3, 3A to 3F controls refrigerant pressure on the internal heat exchanger outlet side according to a temperature of the refrigerant at the outlet of the radiator. Into a temperature sensing section (airtightly closed space A), the inner pressure of which is changed according to the refrigerant temperature on the radiator outlet side, CO2 refrigerant, the charging density of which is 200 to 600 kg/m3, preferably 200 to 450 kg/m3, is charged.Type: ApplicationFiled: November 6, 2006Publication date: May 17, 2007Applicant: DENSO CorporationInventors: Hiromi Ohta, Nobuharu Kakehashi