Osaka, Japan
Osaka, Japan

Daikin Industries, Ltd. is a Japanese multinational air conditioner manufacturing company headquartered in Osaka. It has operations in Japan, China, Australia, India, Southeast Asia, Europe, and North America.Daikin codeveloped a R-410A refrigerant with Carrier and is an innovator in the Split System Air Conditioning Market, and is the inventor of Variable Refrigerant Flow air conditioning systems . Wikipedia.


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A pipe unit is provided for a refrigerant circuit which performs a vapor compression refrigeration cycle by circulating a refrigerant. The pipe unit includes a pipe body having a liquid pipe through which a liquid refrigerant for the refrigerant circuit flows and a gas pipe through which a gaseous refrigerant for the refrigerant circuit flows; and a heat insulator covering each of the liquid pipe and the gas pipe separately. The liquid pipe and the gas pipe, each of which is covered with the heat insulator, are fixed together to form a single piece. Such partial unitization of the refrigerant circuit allows for reduction in the number of days required for installation of an air conditioner.


Patent
Daikin Industries Ltd | Date: 2017-05-17

The present invention provides a novel electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution of the present invention contains a solvent, an electrolyte salt, and a phosphate in an amount of 0.001 to 15 mass% relative to the solvent and represented by the formula (1):(R^(11)O)(R^(12)O)PO_(2)M.


Patent
Daikin Industries Ltd | Date: 2017-05-17

The present invention provides a novel method for producing hydrogen fluoride which can suppress the occurrence of the pasty state over the whole process of producing hydrogen fluoride, reduce the problem of corrosion caused by sulfuric acid, and improve energy efficiency of the process. A method for producing hydrogen fluoride by reacting calcium fluoride and sulfuric acid comprises: (a) mixing and reacting calcium fluoride and sulfuric acid such that a mixture comprising calcium fluoride particles and sulfuric acid substantially maintains a form of particulate to obtain hydrogen fluoride while supplying sulfuric acid to the calcium fluoride particles at a flow rate of 0.002 to 1 mol/min relative to 1 mol of calcium fluoride to such an amount that a molar ratio of sulfuric acid/calcium fluoride is 0.9 to 1.1.


Patent
Daikin Industries Ltd | Date: 2017-05-17

A propeller fan (50) includes a rotary blade hub (51) driven in rotation about a rotation axis (O), and a rotary blade (52) installed at an outer periphery of the rotary blade hub (51). The rotary blade (52) includes a rotary blade body (52a) protruding from an outer peripheral surface of the rotary blade hub (51), and a rib (52b) formed on an outer peripheral edge portion of a pressure surface of the rotary blade body (52a) so as to extend along an outer peripheral edge of the rotary blade body (52a).


Patent
Daikin Industries Ltd | Date: 2017-05-17

The present invention provides a compressor that is provided with a check valve in an injection passage formed in a housing member and is possible to suppress loss of pressure of injected refrigerant. The compressor is provided with a fixed scroll (30) in which an injection passage (31) communicating with a compression chamber (Sc) is formed; a check valve (50) provided in the passage (31); and an injection pipe (25) that supplies refrigerant to the passage (31). The check valve has a valve body (51), slidably arranged in the passage (31), and a valve supporting member (52) that restricts movement of the valve body toward the pipe (25) when the flow of refrigerant from the compression chamber to the pipe (25) is being checked. A center hole (51 a) is formed in the valve body, and a peripheral hole (52a) opposing a rim part (51b) of the valve body is formed in the valve supporting member. During the supply of refrigerant from the pipe (25) to the compression chamber, refrigerant passes through the hole (52a) and the hole (51a) and is supplied to the compression chamber, and during checking by the check valve, the hole (51 a) is closed by the valve supporting member, and the hole (52a) is closed by the valve body.


Patent
Daikin Industries Ltd | Date: 2017-05-17

In a state where part of a plurality of electromagnets (27) is controlled based on a control model built in advanced for a first control region (A1), and where position control of a drive shaft (13) is performed by controlling one or a group of the electromagnets (27) in a second control region (A2), an electromagnetic force of the electromagnets (27) controlled within the second control region (A2) is calculated based on an electromagnetic force of the electromagnets (27) controlled within the first control region (A1).


Patent
Daikin Industries Ltd | Date: 2017-05-17

A refrigeration facility such as a refrigeration container includes a refrigeration device (10) cooling an interior of the refrigeration facility and including an evaporator (24) allowing air inside the refrigeration facility to pass through. A condensate port (43) serving as a corrosive gas detector (50) is installed in a drain hose (42). The drain hose (42) disposes condensate water from a drain pan (41), which collects condensate water generated by the evaporator (24). Detecting corrosive gas in the air inside the container by using a pH sensor (45) to examine a pH value of condensate water in the drain port (43) allows for reducing the risk of corrosion of components installed inside the container.


The present invention relates to the use of a highly stable HFO refrigerant composition, which has improved slidability for the sliding portions of a vapor compression-type refrigeration system, in a vapor compression-type refrigeration system. More specifically, the present invention relates to the use of a HFO refrigerant composition, which comprises at least one type of HFO refrigerant and a polymer of halogenated propene represented by C_(3)H_(a)F_(b)Cl_(c) (provided that a + b + c = 6, a = an integer of 1 to 3, b = an integer of 3 to 5, and c = an integer of 0 to 1) that is an oligomer having a molecular weight of 200 to 900, in at least one member selected from the group consisting of mobile air conditioners, refrigerators, turbo freezers, container freezers, household air conditioners, and industrial air conditioners.


Patent
Daikin Industries Ltd | Date: 2017-05-17

A magnetic bearing includes a controller (30) dividing a control region in two regions based on an individual difference between electromagnets (27) regarding a correlation between two or more parameters among a current (i) flowing through the electromagnets (27), a number of flux linkages (), a gap width (G), magnetic energy (Wm), magnetic co-energy (Wm), electromagnetic force, and a parameter derived using these parameters. In a first control region (A1) with a small individual difference, the controller (30) uses a control model common for all of the electromagnets (27). In a second control region (A2) with a large individual difference, the controller (30) performs position control of a drive shaft (13) using control models provided one for each of the electromagnets (27) or one for each of a predetermined number of electromagnet groups.


This invention provides a method for stably producing 2,3,3,3-tetrafluoropropene for a long period of time wherein unreacted materials are reused after distillation without liquid-liquid separation to suppress catalyst deactivation. The method for producing 2,3,3,3-tetrafluoropropene comprises the step of reacting 1233xf or like chloropropene with hydrogen fluoride in the presence of a catalyst, the step of subjecting the reaction mixture obtained in the above step to distillation to separate the mixture into a first stream comprising 2,3,3,3-tetrafluoropropene as a main component and a second stream comprising unreacted hydrogen fluoride and organic matter containing unreacted chloropropene as main components, and the step of recycling the second stream to the above reaction, the distillation being performed under conditions in which the unreacted hydrogen fluoride and the organic matter containing the unreacted chloropropene do not undergo liquid-liquid separation at a portion of a distillation column from which the second stream is withdrawn.

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