Air conditioner

Patent metadata

Field	Value
Publication number	US-12379140-B2
Application number	US-202218078559-A
Country	US
Kind code	B2
Filing date	Dec 9, 2022
Priority date	Dec 18, 2017
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.

First claim

The invention claimed is:

1. An air conditioner comprising:
a compressor that compresses a refrigerant mixture containing at least 1,2-difluoroethylene;
a motor that drives the compressor; and
a connection unit that causes power to be supplied from an alternating-current (AC) power source to the motor without frequency conversion,
wherein one terminal of the motor is connected in series to an activation circuit.

2. The air conditioner according to claim 1 , wherein the connection unit directly applies an AC voltage of the AC power source between at least two terminals of the motor.

3. The air conditioner according to claim 1 , wherein the AC power source is a single-phase power source.

4. The air conditioner according to claim 1 , wherein the activation circuit is a circuit in which a positive temperature coefficient thermistor and an operation capacitor are connected in parallel to each other.

5. The air conditioner according to claim 1 , wherein the AC power source is a three-phase power source.

6. The air conditioner according to claim 1 , wherein the motor is an induction motor.

7. An air conditioner comprising:
a compressor that compresses a refrigerant mixture containing at least 1,2-difluoroethylene;
a motor that drives the compressor; and
a connection unit that causes power to be supplied from an alternating-current (AC) power source to the motor without frequency conversion,
wherein the refrigerant is selected from the group consisting of refrigerant (1), refrigerant (2), refrigerant (3), refrigerant (4), and refrigerant (5),
wherein refrigerant (1) comprises trans-1,2-difluoroethylene (HFO-1132 (E)), difluoromethane (R32), and 2,3,3,3-tetrafluoro-1-propene (R1234yf), wherein
when the mass % of HFO-1132 (E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132 (E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments IJ, JN, NE, and EI that connect the following 4 points:

point I (72.0, 0.0, 28.0),
point J (48.5, 18.3, 33.2),
point N (27.7, 18.2, 54.1), and
point E (58.3, 0.0, 41.7),
or on these line segments (excluding the points on the line segment EI);
the line segment IJ is represented by coordinates (0.0236y 2 −1.7616y+72.0, y, −0.0236y 2 +0.7616y+28.0);
the line segment NE is represented by coordinates (0.012y 2 −1.9003y+58.3, y, −0.012y 2 +0.9003y+41.7); and
the line segments JN and EI are straight lines,
wherein refrigerant (2) comprises HFO-1132 (E), R32, and R1234yf, wherein
when the mass % of HFO-1132 (E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132 (E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments MM′, M′N, NV, VG, and GM that connect the following 5 points:

point M (52.6, 0.0, 47.4),
point M′ (39.2, 5.0, 55.8),
point N (27.7, 18.2, 54.1),
point V (11.0, 18.1, 70.9), and
point G (39.6, 0.0, 60.4),
or on these line segments (excluding the points on the line segment GM);
the line segment MM′ is represented by coordinates (0.132y 2 −3.34y+52.6, y, −0.132y 2 +2.34y+47.4);
the line segment M′N is represented by coordinates (0.0596y 2 −2.2541y+48.98, y, −0.0596y 2 +1.2541y+51.02);
the line segment VG is represented by coordinates (0.0123y 2 −1.8033y+39.6, y, −0.0123y 2 +0.8033y+60.4); and
the line segments NV and GM are straight lines,
wherein refrigerant (3) comprises HFO-1132 (E), R32, and R1234yf, wherein
when the mass % of HFO-1132 (E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132 (E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments ON, NU, and UO that connect the following 3 points:

point O (22.6, 36.8, 40.6),
point N (27.7, 18.2, 54.1), and
point U (3.9, 36.7, 59.4),
or on these line segments;
the line segment ON is represented by coordinates (0.0072y 2 −0.6701y+37.512, y, −0.0072y 2 −0.3299y+62.488);
the line segment NU is represented by coordinates (0.0083y 2 −1.7403y+56.635, y, −0.0083y 2 +0.7403y+43.365); and
the line segment UO is a straight line,
wherein refrigerant (4) comprises HFO-1132 (E), R32, and R1234yf, wherein
when the mass % of HFO-1132 (E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132 (E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments QR, RT, TL, LK, and KQ that connect the following 5 points:

point Q (44.6, 23.0, 32.4),
point R (25.5, 36.8, 37.7),
point T (8.6, 51.6, 39.8),
point L (28.9, 51.7, 19.4), and
point K (35.6, 36.8, 27.6),
or on these line segments;
the line segment QR is represented by coordinates (0.0099y 2 −1.975y+84.765, y, −0.0099y 2 +0.975y+15.235);
the line segment RT is represented by coordinates (0.0082y 2 −1.8683y+83.126, y, −0.0082y 2 +0.8683y+16.874);
the line segment LK is represented by coordinates (0.0049y 2 −0.8842y+61.488, y, −0.0049y 2 −0.1158y+38.512);
the line segment KQ is represented by coordinates (0.0095y 2 −1.2222y+67.676, y, −0.0095y 2 +0.2222y+32.324); and
the line segment TL is a straight line, and
wherein refrigerant (5) comprises HFO-1132 (E), R32, and R1234yf, wherein
when the mass % of HFO-1132 (E), R32, and R1234yf based on their sum in the refrigerant is respectively represented by x, y, and z, coordinates (x,y,z) in a ternary composition diagram in which the sum of HFO-1132 (E), R32, and R1234yf is 100 mass % are within the range of a figure surrounded by line segments PS, ST, and TP that connect the following 3 points:

point P (20.5, 51.7, 27.8),
point S (21.9, 39.7, 38.4), and
point T (8.6, 51.6, 39.8),
or on these line segments;
the line segment PS is represented by coordinates (0.0064y 2 −0.7103y+40.1, y, −0.0064y 2 −0.2897y+59.9);
the line segment ST is represented by coordinates (0.0082y 2 −1.8683y+83.126, y, −0.0082y 2 +0.8683y+16.874); and
the line segment TP is a straight line.

8. The air conditioner according to claim 7 , wherein the connection unit directly applies an AC voltage of the AC power source between at least two terminals of the motor.

9. The air conditioner according to claim 7 , wherein the AC power source is a single-phase power source.

10. The air conditioner according to claim 7 , wherein one terminal of the motor is connected in series to an activation circuit.

11. The air conditioner according to claim 10 , wherein the activation circuit is a circuit in which a positive temperature coefficient thermistor and an operation capacitor are connected in parallel to each other.

12. The air conditioner according to claim 7 , wherein the AC power source is a three-phase power source.

13. The air conditioner according to claim 7 , wherein the motor is an induction motor.

Assignees

• Daikin Ind Ltd

Inventors

• Ohtsuka Keisuke
• Itano Mitsushi
• Karube Daisuke
• Yotsumoto Yuuki
• Takahashi Kazuhiro
• Tsuda Tetsushi

Classifications

• C09K2205/22

  All components of a mixture being fluoro compounds · CPC title

• C09K2205/126

  Unsaturated fluorinated hydrocarbons · CPC title

• C09K2205/122

  Halogenated hydrocarbons · CPC title

• C09K5/045 Primary

  containing only fluorine as halogen · CPC title

• F25B49/022

  Compressor control arrangements · CPC title