Compressor and refrigeration device

Patent metadata

Field	Value
Publication number	US-12338822-B2
Application number	US-202418900581-A
Country	US
Kind code	B2
Filing date	Sep 27, 2024
Priority date	Mar 31, 2022
Publication date	Jun 24, 2025
Grant date	Jun 24, 2025

Abstract

A compressor is mounted on a product. The compressor includes a drive shaft having an eccentric shaft portion, an electric motor with a rotor, a compression mechanism, a balancer forming a rotary system with the drive shaft and the rotor, a casing, a suction pipe, and a discharge pipe. The compression mechanism has a piston and cylinder to form a fluid chamber, and a blade dividing the fluid chamber into low and high pressure chambers. At a connection portion of the compressor with the product, a composite vibration is a first vibration or less, the composite vibration is a synthesis of the first vibration due to torque according to a pressure difference between the low and high pressure chambers, a second vibration due to an inertial force acting on the piston by the eccentric rotational movement, and a third vibration due to a centrifugal force acting on the rotary system.

First claim

The invention claimed is:

1. A compressor configured to be mounted on a product, the compressor comprising:
a drive shaft having an eccentric shaft portion eccentric with respect to a rotation axis;
an electric motor having a rotor fixed to the drive shaft and configured to rotationally drive the drive shaft;
a compression mechanism having
a piston configured to engage with the eccentric shaft portion and make an eccentric rotational movement,
a cylinder configured to house the piston and form a fluid chamber, and
a blade configured to divide the fluid chamber into a low-pressure chamber and a high-pressure chamber;

a balancer forming a rotary system together with the drive shaft and the rotor;
a casing configured to house the drive shaft, the electric motor, the compression mechanism, and the balancer;
a suction pipe provided to suck a fluid into the compression mechanism; and
a discharge pipe provided to discharge a fluid compressed by the compression mechanism,
the balancer being configured such that at a connection portion of the compressor with the product,
a composite vibration being a first vibration or less,
the composite vibration being a synthesis of the first vibration due to torque according to a pressure difference between the low-pressure chamber and the high-pressure chamber,
a second vibration due to an inertial force acting on the piston by the eccentric rotational movement, and
a third vibration due to a centrifugal force acting on the rotary system.

2. The compressor of claim 1 , wherein
the connection portion of the compressor with the product is any one of the discharge pipe, the suction pipe, and a leg of the casing.

3. The compressor of claim 2 , wherein
the product is a refrigeration apparatus configured to perform a cooling operation, and the fluid is a refrigerant, and
the balancer is configured to satisfy the following Mathematical Expression 1 at the connection portion of the compressor with the product when an operation condition of the compressor is a cooling operation condition in which a pressure difference between a refrigerant sucked through the suction pipe and a refrigerant discharged through the discharge pipe is 2.0 MPa, where
an amplitude of the first vibration is A 1 ,
a phase of the first vibration is Φ1,
an amplitude of the second vibration is A 2 ,
a phase of the second vibration is Ø 2 ,
an amplitude of the third vibration is A 3 , and
a phase of the third vibration is Φ3:

Mathematical
⁢

Expression
⁢

1

A
2
2

+

A
3
2

+

2
⁢

A
1

⁢

A
2

⁢

cos
⁢

(

ϕ
1

-

ϕ
2

)

+

2
⁢

A
2

⁢

A
3

⁢

cos
⁢

(

ϕ
2

-

ϕ
3

)

+

2
⁢

A
3

⁢

A
1

⁢

cos
⁢

(

ϕ
3

-

ϕ
1

)

≤
0.

(
1
)

4. The compressor of claim 2 , wherein
the product is a refrigeration apparatus configured to perform a cooling operation, and the fluid is a refrigerant, and
the balancer is configured to satisfy the following Expression 2 of Mathematical Expression 4 at the connection portion of the compressor with the product when an operation condition of the compressor is a cooling operation condition in which a pressure difference between a refrigerant sucked through the suction pipe and a refrigerant discharged through the discharge pipe is 2.0 MPa, where
an amplitude of the first vibration is A 1 ,
a phase of the first vibration is Φ 1 ,
an amplitude of the second vibration is A 2 ,
a phase of the second vibration is Φ 2 ,
an amplitude of the third vibration is A 3 , and
a phase of the third vibration is Φ 3 :

Mathematical
⁢

Expression
⁢

4

A
2
2

+

A
3
2

+

Assignees

• Daikin Ind Ltd

Inventors

• KIKUTAKE Daiki
• Katayama Tatsuya

Classifications

• F04C2270/12

  Vibration · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title

• F04C18/3564

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04C2250/301

  compression chamber profile defined by a mathematical expression or by parameters · CPC title

• F04C23/008 Primary

  Hermetic pumps · CPC title