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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Patent
Daikin Industries Ltd and Daikin | Date: 2017-08-02

An air conditioning system (100) comprises a refrigerant circuit (40), and an electrical circuit (50). The refrigerant circuit (40) includes an indoor heat exchanger (22), an outdoor heat exchanger (13), a compressor (11), a refrigerant pipe (171), and a plurality of pressure stats (181, 182). The refrigerant pipe (171) is connected to the compressor (11) and forming at least part of the refrigerant circuit (40). The plurality of pressure stats (181, 182) is configured to detect pressure of the refrigerant in the refrigerant pipe (171). The electrical circuit (50) is configured to drive the refrigerant circuit (40). Each of the plurality of the pressure stats (181, 182) includes a pressure sensor (630, 730) and an electrical switch (640, 740). The pressure sensor (630, 730) is configured to detect pressure of the refrigerant in the refrigerant pipe (171). The electrical switch (640, 740) is configured to stop the electrical circuit (50) from driving the refrigerant circuit (40) at least partially in accordance with the pressure detected by the respective pressure sensor (630, 730). The plurality of the pressure stats (181, 182) is connected to different connection portions (301, 302) of the refrigerant pipe (171), respectively. The connection portions (301, 302) are spaced out from each other.


Patent
Daikin Industries Ltd and Daikin | Date: 2017-05-31

A heat exchanger (10) comprises a front wall (20) and a back wall (30) to form a space (40) for a flue gas, and a front channel (60) and a back channel (70) formed in the front wall (20) and the back wall (30), respectively, in which a fluid is to flow. The heat exchanger (10) is configured such that the fluid in the front and back channels (60, 70) can exchange heat with the flue gas, in use. The entire back wall (30) extends along a first plane (P1). The front wall (20) includes a lower portion (22) and an upper portion (24). The lower portion (22) extends upwardly along the back wall (30). The upper portion (24) extends upwardly from the upper end of the lower portion (22) and extends outwardly away from the back wall (30) so as to form a combustion space (42) of a flammable gas between the upper portion (24) and the back wall (30). The heat exchanger (10) is further configured such that the volume flow rate and/or mass flow rate of the fluid in the front channel (60) is greater than the back channel (70), in use.


Patent
Daikin Industries Ltd and Daikin | Date: 2017-05-31

A heat exchanger (10) comprises a front wall (20) and a back wall (30) to form a space (40) for a flue gas such that a fluid flowing through a channel (60, 70) formed in the front wall (20) and back wall (30) can exchange heat with the flue gas, in use. The entire back wall (30) extends along a first plane (P1). The back wall (30) is provided with a back fin (120). The front wall (20) includes a lower portion (22) and an upper portion (24). The lower portion (22) extends upwardly along the back wall (30). The upper portion (24) extends upwardly from the upper end of the lower portion (22), extends outwardly away from the back wall (30) so as to form a combustion space (42) of a flammable gas between the upper portion (24) and the back wall (30), and is provided with a front fin (110). The front fin (110) and the back fin (120) are arranged symmetrically with respect to a virtual line (C2) along which the flammable gas is to be injected into the combustion space (42).


Patent
Daikin Industries Ltd and Daikin | Date: 2017-05-31

A heat exchanger (10) comprises walls (20, 30) to form a space (40) for a flue gas. At least one channel (60) formed in at least one of the walls (20) in which a fluid is to flow. The channel (60) includes at least two straight portions (60a, 60b) which are arranged in substantially parallel to each other and are connected in series. A stagnation prevention means (64) is arranged in at least one connecting area (61 a) of the straight portions (60a, 60b) where the two straight portions (60a, 60b) are connected and which is located on the most upstream side in the channel (60) with respect to a fluid flow.


Patent
Daikin Industries Ltd and Daikin | Date: 2017-05-31

A heat exchanger (10) comprises a front wall (20) and a back wall (30) to form a space (40) for a flue gas such that a fluid flowing through a channel (60, 70) formed in the front and back wall (20, 30) can exchange heat with the flue gas, in use. The front wall (20) includes a lower portion (22) and an upper portion (24). The lower portion (22) extends along the back wall (30). The upper portion (24) extends upwardly from the upper end of the lower portion (22) and extends outwardly away from the back wall (30) so as to form a combustion space (42) of a flammable gas between the upper portion (24) and the back wall (30). The length (L2) of the upper portion (24) along the longitudinal direction thereof is longer than the length (L1) of the lower portion (22) along the longitudinal direction thereof.


Patent
Daikin Industries Ltd and Daikin | Date: 2017-06-21

A heat exchange system (1) comprises a heat exchange main unit (10), a housing (9), a drain collecting part (4) and a siphon (200). The heat exchange main unit (10) has a gas channel (40) and a fluid channel (60, 70) configured such that a fluid in the fluid channel (60, 70) exchanges heat with the flue gas in the gas channel (40) in use. The housing (9) accommodates the heat exchange main unit (10). The drain collecting part (4) is arranged inside the housing (9) and collects condensate from the flue gas. The siphon (200) is detachably attached to the drain collecting part (4) to prevent the release of the flue gas from a condensate outlet (204) formed therein. The siphon (200) has a tubular body (210). A condensate inlet (202) is formed on one end side of the tubular body (210) and the condensate outlet (204) is formed on the other end side of the tubular body (210). The tubular body (210) has an attaching part (212) and a grip (214). The attaching part (212) is arranged on the end side of tubular body (210) on which the condensate inlet (202) is formed. The tubular body (210) is configured to detachably attach the tubular body (210) to the drain collecting part (4) through a hole (94) formed within a bottom wall (92) of the housing (9). The grip (214) is arranged on the other end side of the tubular body (210) on which condensate outlet (204) is formed. The grip (214) is configured to be located outside the housing (9) when the tubular body (210) is attached to the drain collecting part (4).


Patent
Daikin Industries Ltd and Daikin | Date: 2017-06-21

A heat exchanger system (1) comprises a heat exchange main unit (10), a housing (9), a drain collecting part (4) and a siphon (200). The heat exchange main unit (10) has a gas channel (40) and a fluid channel (60, 70) configured such that a fluid in the fluid channel (60, 70) exchanges heat with the flue gas in the gas channel (40) in use. The housing (9) accommodates the heat exchange main unit (10). The drain collecting part (4) is arranged inside the housing (9) and collects condensate from the flue gas. The siphon (200) is attached to the drain collecting part (4) to prevent the release of the flue gas from a condensate outlet (204) formed therein. The siphon (200) has a tubular body (210) being attached to the drain collecting part (4) and having a first portion (240) and a second portion (250). The first portion (240) has a condensate inlet (202). The second portion (250) has the condensate outlet (204) and an operation member (252). The tubular body (210) is configured such that, when the tubular body (210) is attached to the drain collecting part (4), the first portion (240) is connected to the drain collecting part (4) and can be at least partially located inside the housing (9), the second portion (250) can be at least partially located outside the housing (9), and the operation member (252) can be located outside the housing (9). The second portion (250) is detachably attached to the first portion (240).


Patent
Daikin and Daikin Industries Ltd | Date: 2017-04-12

A plate for an air conditioning device, the plate being a fan plate for supporting one or more fans or a bell mouth plate having a hole for permitting air to pass therethrough to an adjacent fan, the plate comprising:a first region including a hole for permitting air to pass the fan;a second region being a heat transfer inhibiting region comprising a plurality of perforations and a plurality of bridges separating the perforations, the heat transfer inhibiting region substantially surrounding the first region;and a third region for attachment of the plate to a housing of the air conditioning device;wherein the second region is located between the first region and the third region, the second region being configured to inhibit the transfer of heat between the first region and the third region. Where the plate is a fan plate for supporting a fan, the first region is configured to be attached to the fan.


Patent
Daikin and Daikin Industries Ltd | Date: 2017-04-12

1. Air conditioner for conditioning a space (72) inside a building (70) comprising:a heat source unit (30) having a heat exchanger unit (31) comprising a first heat exchanger (5) disposed in a first casing (2) and configured to exchange heat with a heat source anda compressor unit (32) comprising a compressor (37) disposed in a second casing (44) separate from the first casing, the heat exchanger unit and the compressor unit being fluidly connected via a first liquid refrigerant pipe (78) and a first gaseous refrigerant pipe (76); andat least one indoor unit (50) having a second heat exchanger (53) configured to exchange heat with the space to be conditioned and being fluidly communicated to the heat exchanger unit and/or the compressor unit via a second liquid refrigerant pipe (79) and a second gaseous refrigerant pipe (77), wherein the outer diameter of the first liquid refrigerant pipe is larger than the outer diameter of the second liquid refrigerant pipe and/or the outer diameter of the first gaseous refrigerant pipe is larger than the outer diameter of the second gaseous refrigerant pipe.


Patent
Daikin and Daikin Industries Ltd | Date: 2017-04-12

There is provided a duct-type heat exchanger system. The duct-type heat exchanger system comprises a housing and a heat exchanger. The housing comprises a housing stop member and a housing guide member. The heat exchanger comprises a heat exchanger stop member and a heat exchanger guide member. The housing is configured such that the heat exchanger is at least partially insertable into the housing by a translation in a first direction of the heat exchanger relative to the housing. The housing stop member and the heat exchanger stop member are configured to be releasably attachable to each other. The housing guide member and the heat exchanger guide member are configured to guide the heat exchanger stop member and the housing stop member into alignment with each other as the heat exchanger is translated in the first direction relative to the housing.

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