Daikin Industries

A partitioning member (5) is arranged between a plate stack (30) and a refrigerant inlet (21). The partitioning member (5) extends along a first direction that is a stacking direction of the plate stack (30). The partitioning member (5) has a plurality of communication holes (50). The plurality of communication holes (50) are open toward the plate stack (30) at positions facing the central heat exchange section (35), the first heat exchange section (36), and the second heat exchange section (37).

There is provided a use as a refrigerant in a refrigeration cycle apparatus capable of suppressing decomposition of the refrigerant. In a use as a refrigerant in a refrigeration cycle apparatus (1), the refrigeration cycle apparatus having a refrigerant circuit (10) including a compressor (11), the compressor (11) including a compression element (21) that compresses the refrigerant, and an oil reservoir (37) that stores a refrigerating machine oil, the pressure of air inside the refrigerant circuit (10) being 667 Pa or less, the refrigerating machine oil containing 3.0 wt% or more and 5.0 wt% or less of an acid scavenger, the temperature of the refrigerating machine oil in the oil reservoir (37) being maintained at 120°C or lower, and the refrigerant being at least one of a mixed refrigerant containing 1,2-difluoroethylene and one or more types of hydrofluorocarbon, a mixed refrigerant containing 1,2-difluoroethylene and one or more types of hydrofluoroolefin, and a mixed refrigerant containing one or more types of hydrofluorocarbon and one or more types of hydrofluoroolefin.

A refrigeration cycle apparatus includes: a shut-off valve (26, 43) configured to shut off a flow of a refrigerant from a heat-source-side circuit (20a) to a utilization-side circuit (45) when a refrigerant leakage sensor (70) detects leakage of the refrigerant; and a controller (100) configured to execute a determination action including: a first control to close the shut-off valve (26, 43) or reduce an opening degree of the shut-off valve (26, 43) during operation of a compressor (22); and a second control to determine, after the first control, whether the shut-off valve (26, 43) is abnormal, based on a pressure or temperature of the refrigerant in a refrigerant circuit (10). The controller (100) executes the determination action in response to acquisition of a first signal for setting the utilization unit (40) to a thermo-off state.

An air conditioning system (1) includes an air conditioner (2) that includes a first refrigerant circuit (23), adjusts a temperature of air taken in from an indoor space by heat exchange with a refrigerant, and supplies the air to the indoor space, a ventilator (3) that adjusts a temperature of air taken in from outdoors and supplies the air to the indoor space, and a control unit (4) that controls the air conditioner (2) and the ventilator (3) in accordance with a heat load of the indoor space that requires temperature adjustment, in which when the heat load of the indoor space to be temperature-adjusted by the first indoor unit (22A) of the air conditioner (2) is in a high-load state and the heat load of the indoor space to be temperature-adjusted by the second indoor unit (22B) is in a low-load state, the control unit (4) stops a temperature adjustment operation of the second indoor unit (22B) and performs the temperature adjustment operation by the ventilator (3).

An air conditioner capable of suppressing inflow of a refrigerant into a heat exchanger as necessary is provided. An air conditioner 1 includes a refrigerant circuit including a utilization heat exchanger (22) having a connection portion (22a) into which a refrigerant flows and a connection portion (22b) from which the refrigerant flows out, and a flow path switching valve (100). A flow path switching valve includes a body (120) in which a first space (V1) is formed and ports (122a to 122d) are provided on an inner wall (122), and a valve body (140) disposed in the first space and forming a first flow path (R1) through which the refrigerant flows. The port (122b) communicates with the connection portion (22a), and the port (122c) communicates with the connection portion (22b). In the valve body (140), the first flow path is switched to a state of connecting the port (122a) and the port (122b), a state of connecting the port (122a) and the port (122c), and a state (S3) of connecting the port (122b) and the port (122c), and the ports to which the first flow path is not connected in each state are connected by a second flow path (R2) formed in the first space.

Provided is a flow path switching valve having the flow paths extending in multiple directions, the flow path switching valve preventing a valve element from being separated from a seal member. A flow path switching valve includes a valve body (40), a valve element (50), and a seal member (70). The valve body (40) wherein a valve chamber (30) is formed internally, and at least three or more ports (Pi1 to Pi3) serving as fluid inlets and outlets are provided on the wall surface forming the valve chamber (30). The valve element (50) is disposed in the valve chamber (30) and has a first passage (51) through which the fluid flows. The seal member (70) seals an interface between the valve element (50) and at least one of the ports. The seal member (70) includes a base portion (80) and an extended portion (90). The base portion (80) is disposed on the port side. The extended portion (90) is extended so as to open from the base portion (80) side toward the valve element (50), and is brought into contact with the valve element (50) while being biased toward the valve element (50) in a communication state.

A flow path switching valve having a small pressure loss is provided. A flow path switching valve (100) includes a body casing (120) having a first end (125a) and a second end (125b), in which a first space (V1) is formed inside, and a first port (130a), a second port (130b), and a third port (130c) are provided on an outer surface (124), and a valve body disposed inside the first space. The state of the valve body is switched between a first state in which the first port and the second port are connected and a second state in which the first port and the third port are connected. The second port and the third port are disposed at the first end of the body casing, and the first port is disposed at the second end of the body casing.

Provided is a method for producing a purified fluoroalkyne compound, wherein the method includes subjecting a water-containing fluoroalkyne compound to a dehydration process using a fluorinated adsorbent to obtain a purified fluoroalkyne compound, and the fluoroalkyne compound is a fluoroalkyne compound represented by the formula 1.

An indoor expansion valve (51) is an expansion valve that decompresses a refrigerant. The indoor expansion valve (51) includes a valve main body (41), a first pipe (100), and a second pipe (200). The valve main body (41) has a valve chamber (43) in which a valve body (42) is accommodated. The first pipe (100) is connected to the valve chamber (43) in a first direction that is an axial direction of the valve body (42). The second pipe (200) is connected to the valve chamber (43) in a second direction intersecting the first direction. The second pipe (200) has a wall thickness (T) at a reference position (L0) that is an end portion (200a) on the valve chamber (43) side being smaller than the wall thickness (T) at a first position (L1) away from the reference position (L0) by a first distance on a side opposite to the valve chamber (43) in the second direction.

This invention provides a method for purifying HFO-1132 to a high purity while suppressing the isomerization and loss of HFO-1132. Specifically, the present invention provides a method for purifying 1,2-difluoroethylene, which is HFO-1132, the method comprising, in this order,step 1 of bringing a composition comprising trans-1,2-difluoroethylene, which is HFO-1132(E), and water into contact with a zeolite having an average pore size of 2 to 4 Å to reduce the water content from the composition; andstep 2 of recovering a purified product containing HFO-1132(E) and a reduced content of water, and containing less than 0.1% by volume of HFO-1132(2).