CN-122014610-A - Multi-rotor compressor and refrigeration equipment

CN122014610ACN 122014610 ACN122014610 ACN 122014610ACN-122014610-A

Abstract

The invention discloses a multi-rotor compressor and refrigeration equipment, and relates to the technical field of liquid variable capacity type compression pumps, wherein the compressor comprises a shell, a crankshaft, rotors and a built-in motor, the crankshaft is arranged in the shell through a magnetic suspension bearing, each rotor is arranged on the crankshaft, and the built-in motor is arranged in the shell and is in transmission connection with the crankshaft; the whole of each rotor is of a three-arc structure, the outer contour line of the rotor consists of three identical protruding cambered surfaces and three sealing vertexes, a sealing compression cavity is arranged in a shell, each rotor is eccentrically arranged in the sealing compression cavity, each rotor is uniformly distributed on the circumference around the central shaft of a crankshaft, the crankshaft rotates to drive each sealing vertexes to be always kept in dynamic contact with the inner wall of the sealing compression cavity, and three independent working gas chambers with periodically-changing volumes are formed between the three protruding cambered surfaces and the inner wall of the sealing compression cavity. The compressor can greatly reduce pulsation noise, improve compression efficiency and realize high-efficiency energy-saving and ultra-silent effects.

Inventors

ZHOU YUEPEI
YANG WENJU
LUO BIN
LIU YIMING
ZHOU SHUYUAN
ZHANG HAIFENG

Assignees

广东西科冷链科技股份有限公司
广东斯柯电器有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The multi-rotor compressor is characterized by comprising a shell, a crankshaft, at least one rotor and a built-in motor, wherein the crankshaft is arranged in the shell through a magnetic suspension bearing, each rotor is arranged on the crankshaft, and the built-in motor is arranged in the shell and is in transmission connection with the crankshaft; Each rotor is integrally in a three-arc structure, the outer contour line of the rotor consists of three identical protruding cambered surfaces and three sealing vertexes positioned between the adjacent protruding cambered surfaces, the three sealing vertexes are positioned on the same circumference taking the center of the rotor as the center of the circle, and the adjacent sealing vertexes are uniformly distributed along the radial interval of 120 DEG; and the crankshaft rotates to drive three sealing vertexes of the rotor to be always in dynamic contact with the inner wall of the sealing compression cavity, and three independent working gas chambers with periodically-changed volumes are formed between the three protruding cambered surfaces and the inner wall of the sealing compression cavity.
2. The multi-rotor compressor as claimed in claim 1, wherein one rotor and one hermetic compression chamber constitute one refrigerant compression structure, and two sets of refrigerant circulation components are provided on each refrigerant compression structure, each set of refrigerant circulation components including two suction valves and two discharge valves; The sealed compression cavity area on each refrigerant compression structure is divided into a first air suction cavity, a first air exhaust cavity, a second air suction cavity and a second air exhaust cavity, wherein the first air suction cavity and the second air exhaust cavity share the same independent working gas cavity, the first air exhaust cavity corresponds to another independent working gas cavity, the second air suction cavity corresponds to the last independent working gas cavity, the first air suction cavity is connected with one of the air suction valves through an air suction port, the first air exhaust cavity is connected with one of the air exhaust valves through an air exhaust port, the second air suction cavity is connected with the other air suction valve through the air suction port, and the second air exhaust cavity is connected with the other air exhaust valve through an air exhaust port; The two air suction valves keep the valve channels communicated to suck air in a normal state, the valve channels are closed in a high-pressure state, the two air discharge valves keep closed in a normal state, and the valve channels are opened to discharge air in a high-pressure state.
3. The multi-rotor compressor of claim 2, wherein each suction valve comprises a suction valve shell, a suction sliding valve block and a suction valve spring, wherein a first air inlet and a first air outlet are formed in the suction valve shell, an inner guide pipe is arranged at the first air inlet of the suction sliding valve block, the suction sliding valve block is tubular and is not communicated with the middle part, one end of the suction sliding valve block is sleeved on the inner guide pipe in a sliding manner, the suction valve spring is arranged at the other end of the suction sliding valve block, and a through hole is formed in the suction sliding valve block close to a pipe orifice of the inner guide pipe; The exhaust valve comprises an exhaust valve shell, an exhaust sliding valve block and an exhaust valve spring, wherein a second air inlet and a second air outlet are formed in the exhaust valve shell, a hollow limiting cavity is formed in the exhaust valve shell, the exhaust sliding valve block and the exhaust valve spring are sequentially arranged in the hollow limiting cavity, a hollow channel is formed in the exhaust sliding valve block, and the hollow channel of the exhaust sliding valve block is not communicated with the second air outlet in a normal state; An air suction valve sealing ring is arranged at the connecting position of the first air inlet of the air suction valve shell, an air suction valve sealing ring is arranged on the inner wall of the air discharge valve sliding valve block, an air discharge valve sealing ring is arranged at the connecting position of the second air inlet of the air discharge valve shell, and an air discharge valve sealing ring is arranged between the air discharge valve sliding valve block and the hollow limiting cavity of the air discharge valve shell.
4. The multi-rotor compressor as claimed in claim 1, wherein the housing comprises a base and a top cover detachably installed at an upper portion of the base, a housing sealing ring is provided between the base and the top cover, a plurality of suction ports and discharge ports are provided at both sides of the base and the top cover, respectively, a suction valve is installed at the suction port and communicates with the hermetic compression chamber, and a discharge valve is installed at the discharge port and communicates with the hermetic compression chamber.
5. The multi-rotor compressor of claim 1, wherein three seal peaks on each rotor are respectively provided with a seal connecting piece, each seal connecting piece comprises a first seal piece, a first spring piece and a first fixing ring, the seal peaks of the rotors are concavely provided with limit grooves for installing the first seal pieces along the radial direction, the first fixing rings are fixed at two ends of a notch of each limit groove, two ends of each first spring piece are respectively fixed on the first fixing rings, two ends of each first seal piece are provided with guide inclined planes, one side of each first seal piece is abutted against the first spring piece after being installed in each limit groove, and the other side of each first seal piece is in dynamic seal contact with the inner wall of the seal compression cavity.
6. The multi-rotor compressor as claimed in claim 5, wherein two concentric annular grooves are formed in both sidewalls of the rotor, and an annular seal ring is installed in each of the inner annular grooves.
7. The multi-rotor compressor as claimed in claim 1, wherein a rotation gear is provided at a center of each of the rotors, fixed gears are fixed in the housing in one-to-one correspondence to the number of the rotation gears, and the fixed gears are engaged with the rotation gears to be driven.
8. The multi-rotor compressor as recited in claim 1 wherein said built-in motor includes a motor rotor mounted on a stepped shaft of said crankshaft through a flange, and a motor stator mounted in a cavity of said housing.
9. The multi-rotor compressor as claimed in any one of claims 1 to 7, wherein the magnetic suspension bearings comprise a plurality of radial magnetic suspension bearings installed in the middle of the crankshaft and axial magnetic suspension bearings installed at both ends of the crankshaft, and the radial magnetic suspension bearings and the axial magnetic suspension bearings are arranged in a halbach array manner so as to enhance the supporting strength and the rotation stability of the rotor and reduce the vibration and the friction noise of the rotor; Each radial magnetic suspension bearing is correspondingly arranged in the shell through bearing fixing seats with matched numbers, or a radial bearing limiting chamber for arranging the radial magnetic suspension bearings is formed in the shell, each radial magnetic suspension bearing comprises a radial magnetic suspension bearing rotating ring and a radial magnetic suspension bearing fixing ring sleeved on an outer ring of the radial magnetic suspension bearing rotating ring, the radial magnetic suspension bearing fixing ring is arranged in the bearing fixing seat, and the radial magnetic suspension bearing rotating ring is fixed in the middle of the crankshaft; Each axial magnetic suspension bearing is installed in the shell through bearing fixing seats matched in number, an axial bearing limiting chamber for installing the axial magnetic suspension bearing is formed at two ends of the shell, each axial magnetic suspension bearing comprises an axial magnetic suspension bearing rotating ring and an axial magnetic suspension bearing fixing ring arranged on one side of the axial magnetic suspension bearing rotating ring side by side, the axial magnetic suspension bearing fixing ring is installed in the axial bearing limiting chamber, and the axial magnetic suspension bearing rotating ring is fixed at two ends of the crankshaft.
10. A refrigeration apparatus comprising a multi-rotor compressor as claimed in any one of claims 1 to 9.

Description

Multi-rotor compressor and refrigeration equipment Technical Field The invention relates to the technical field of liquid variable capacity type compression pumps, in particular to a multi-rotor compressor and refrigeration equipment. Background At present, the existing refrigeration industries such as refrigerators, air conditioners and the like widely adopt a rolling rotor type compressor as a core refrigeration component thereof. The working principle of the compressor is that a crank shaft with an eccentric structure drives a roller to do circular motion in a cylinder with an arc-shaped inner wall, meanwhile, the interior of the cylinder is divided into a high-pressure cavity and a low-pressure cavity by utilizing a sliding vane, and along with the rotation of the roller, gas is compressed and discharged in the high-pressure cavity, so that the compression process in refrigeration cycle is realized. However, such conventional designs face a number of technical challenges in practical applications. The compressor disclosed in chinese patent No. CN202310018814.7 belongs to an improved version of a rolling rotor compressor, and the double-cylinder double-stage compression is realized by setting a double-cavity structure of linkage of a piston and a roller in the compressor, so that the problem of compression efficiency is solved to a certain extent, but the structure still adopts a single cylinder for compression, that is, the cylinder only completes one exhaust every revolution of a crankshaft in the cylinder, and severe pulsation can generate obvious vibration and buzzing airflow noise. In order to alleviate the severe pulsation of a single cylinder, in the prior art, two cylinders are arranged side by side or staggered, such as a compressor disclosed in chinese patent No. CN202511268081.8, so that the two cylinders are arranged side by side up and down, i.e. one revolution of a crankshaft, and the two cylinders are arranged for one gas. It can be seen that the compression process of the two compression cylinder structures still has obvious intermittence, so that the exhaust of the compressor presents obvious flow pulsation, further the air flow pulsation noise of a system pipeline is triggered, the unit volume power density is low, meanwhile, the eccentric mass of the crankshaft and the periodical radial air force generated in the compression process are difficult to be completely balanced, and the whole machine generates larger mechanical vibration and noise in the operation process, thereby not only affecting the stable operation of the equipment, but also possibly shortening the service life of the equipment. Meanwhile, on the basis of the compression structure, the crankshaft structure of the existing compressor is generally supported by a mechanical contact bearing (such as a ball bearing or a sliding bearing). The unavoidable solid friction of such mechanical bearings during operation results in significant energy consumption and wear, requiring complex lubrication systems to maintain operation, which not only increases the risk of failure, but may also contaminate the refrigeration circuit. Therefore, how to avoid or greatly reduce the periodically-changing flow pulsation so as to provide a continuous smooth flow pulsation, thereby reducing airflow pulsation noise, improving compression efficiency, and realizing high efficiency, energy saving and ultra-silence in the true sense of the compression refrigeration technology is a current urgent problem to be solved. Disclosure of Invention In order to overcome the defects in the prior art, one of the purposes of the invention is to provide a multi-rotor compressor. It is a second object of the present invention to provide a refrigeration apparatus including a multi-rotor compressor. The multi-rotor compressor comprises a shell, a crankshaft, at least one rotor and a built-in motor, wherein the crankshaft is arranged in the shell through a magnetic suspension bearing, each rotor is arranged on the crankshaft, and the built-in motor is arranged in the shell and is in transmission connection with the crankshaft; The rotor is integrally in a three-arc structure, the outer contour line of the rotor consists of three identical protruding cambered surfaces and three sealing vertexes positioned between the adjacent protruding cambered surfaces, the three sealing vertexes are positioned on the same circumference taking the center of the rotor as the center of a circle, and the adjacent sealing vertexes are uniformly distributed along the radial direction at 120 DEG intervals; and the crankshaft rotates to drive three sealing vertexes of the rotor to be always in dynamic contact with the inner wall of the sealing compression cavity, and three independent working gas chambers with periodically-changed volumes are formed between the three protruding cambered surfaces and the inner wall of the sealing compression cavity. Further, a rotor and a sealed compression