R744 rotor type electric compressor

Abstract

The invention discloses an R744 rotor type electric compressor, and belongs to the technical field of compressors. According to the technical scheme, the air compressor is characterized by comprising a shell and an inner cavity formed in the shell, a driving assembly and a compression assembly are arranged in the inner cavity, the compression assembly divides the inner cavity into an air inlet cavity and an exhaust cavity, and the driving assembly is located in the air inlet cavity; the compression assembly comprises a cylinder body, an upper plate body, a partition plate, a lower plate body, a first compression cavity and a second compression cavity, the first compression cavity is located between the upper plate body and the partition plate, the second compression cavity is located between the lower plate body and the partition plate, and the first compression cavity is located on the upper side of the second compression cavity. Rotors and swing pieces are arranged in the first compression cavity and the second compression cavity correspondingly, and efficient compression and circulation of refrigerants are achieved through the arrangement of the structure. The driving assembly and the compression assembly in the compressor work cooperatively, the performance of the R744 rotor type electric compressor is improved from the aspects of improving the operation efficiency, protecting the compressor, reducing pressure loss, ensuring lubricating oil circulation and the like, and a powerful guarantee is provided for stable operation of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more specifically, to an R744 rotary electric compressor. Background Art

[0002] Most traditional automotive air conditioning systems use Freon-based refrigerants, such as R134a. However, the global warming potential (GWP) of such refrigerants is relatively high, which exacerbates the problem of global warming to a certain extent. In view of this, regions such as the European Union have adopted relevant regulations to gradually restrict the use of high-GWP refrigerants and actively promote the research and development of environmentally friendly alternative working fluids.

[0003] Among many potential alternative refrigerants, R744 refrigerant can still efficiently achieve the heating function even in a low-temperature environment below -30°C. R744 refrigerant not only has the advantage of environmental protection, but also has a relatively low acquisition cost, so it is considered an ideal refrigerant to replace traditional refrigerants.

[0004] The Japanese patent application with publication number JP2009047161A discloses a hermetic compressor, including a compression element for compressing a working fluid, a housing having a substantially cylindrical main body plate, and a compression element fixed thereto. In addition, a mounting plate fixed to the main body plate by welding is provided. The compression element and the mounting plate are fastened and fixed by six fastening bolts, thereby achieving noise reduction in a hermetic compressor having a structure in which the compression element is fixed to a fixing member and the fixing member is fixed to the housing by welding.

[0005] At present, existing automotive electric compressors are usually scroll electric compressors. However, due to the very high saturation pressure of R744, if it is directly applied to a scroll compressor, the performance and quality requirements for the moving disk and the stationary disk will be extremely high. Therefore, a new solution is needed to solve the above problems. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an R744 rotary electric compressor.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: an R744 rotary electric compressor, including a housing and an inner cavity formed in the housing, wherein a driving assembly and a compression assembly are arranged in the inner cavity, the compression assembly divides the inner cavity into an intake cavity and an exhaust cavity, and the driving assembly is located in the intake cavity; the compression assembly includes a cylinder block, an upper plate body, a partition plate, a lower plate body, and a first compression cavity and a second compression cavity. The first compression cavity is located between the upper plate body and the partition plate, the second compression cavity is located between the lower plate body and the partition plate, and the first compression cavity is located above the second compression cavity; Both a first compression chamber and a second compression chamber are provided with a rotor and a swinging member. The swinging member is connected to the rotor, and the rotor is eccentrically connected to a drive shaft of a drive assembly; One end of the swinging member is located inside a bushing. Bushing holes are formed in upper surfaces of both the partition plate and the lower plate body, and the bushing is arranged in the bushing holes; The first compression chamber and the second compression chamber are divided into a low-pressure chamber and a high-pressure chamber by the rotor and the swinging member. The low-pressure chamber of the first compression chamber communicates with the low-pressure chamber of the second compression chamber, and the low-pressure chamber of the second compression chamber communicates with an intake chamber.

[0008] The present invention is further configured as: the partition plate includes a first protruding portion protruding towards the first compression chamber, and the bushing hole of the first compression chamber is formed in the first protruding portion; the lower plate body includes a second protruding portion protruding towards the second compression chamber, and the bushing hole of the second compression chamber is formed in the second protruding portion.

[0009] The present invention is further configured as: the housing includes a front cover and a rear cover. The cylinder block has a supporting portion extending outwards. The supporting portion, the front cover and the rear cover extend outwards to form a positioning portion, and a plurality of positioning holes are formed in the positioning portion. The supporting portion, the front cover and the rear cover are connected to each other by bolts arranged in the positioning holes.

[0010] The present invention is further configured as: it further includes an oil return pipe. An oil return channel is formed inside the drive shaft. One end of the oil return pipe extends to the bottom of the high-pressure chamber, and the other end of the oil return pipe communicates with the oil return channel. A plurality of oil return holes communicating with an area to be lubricated are formed in a side surface of the drive shaft, and the oil return holes communicate with the oil return channel.

[0011] The present invention is further configured as: a filtering assembly is arranged at an air inlet of the intake chamber.

[0012] The present invention is further configured as: an upper exhaust valve is arranged above the first compression chamber. The upper exhaust valve is connected to an outer side of an upper plate body. An exhaust outlet is formed in a side wall of the front cover. After the pressure reaches a set value, the upper exhaust valve opens, and gas sequentially flows through the exhaust outlet and a gap between the compression assembly and the compression chamber and enters an exhaust chamber. A path through which the gas flows is an exhaust channel.

[0013] The present invention is further configured as: the drive assembly is a motor. A main shaft of the motor is in transmission connection with the drive shaft. A controller assembly is connected to one side of the housing, and the motor is electrically connected to the controller assembly.

[0014] In summary, the present invention has the following beneficial effects: The R744 rotary electric compressor realizes the efficient compression and circulation of the refrigerant through the structural arrangement. The drive component and the compression component inside the compressor work together, using the compression chamber formed between the front cover and the rear cover to transfer and compress the refrigerant between the low-pressure chamber and the high-pressure chamber, thereby increasing the pressure and temperature of the refrigerant. This not only ensures the efficiency of the compression process but also improves the stability and compactness of the overall structure through a reasonable layout. At the same time, through the connection between the intake chamber and the air-conditioning system, the smooth inflow and outflow of the refrigerant are realized, further improving the energy efficiency ratio of the air-conditioning system. The filter component, compression component, oil return scheme, etc. all comprehensively enhance the performance of the R744 rotary electric compressor from aspects such as improving operating efficiency, protecting the compressor, reducing pressure loss, ensuring lubricating oil circulation, and extending service life, providing a strong guarantee for the stable operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a sectional view of the present invention Figure 1 ; Figure 2 is a schematic diagram of the intake structure; Figure 3 is a sectional view of the present invention Figure 2 ; Figure 4 is Figure 3 an enlarged view of part A in

[0016] In the figure: 11, support part; 12, front cover; 13, rear cover; 2, controller assembly; 31, rotor; 32, swing part; 4, drive shaft; 41, oil return channel; 51, positioning part; 52, partition; 53, bushing hole; 54, bushing; 6, intake chamber; 7, oil return pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0018] As Figure 1As shown in the figure, the R744 rotary electric compressor includes a housing and an inner cavity formed within the housing. The housing includes a front cover 12 and a rear cover 13. The cylinder block has a support portion 11 extending outward. The support portion 11, the front cover 12, and the rear cover 13 extend outward to form a positioning portion 51. A number of positioning holes are provided on the positioning portion 51. The support portion 11, the front cover 12, and the rear cover 13 are connected to each other by bolts disposed in the positioning holes, which is used to solve the problem in the prior art that the positioning mechanism is directly provided on the side wall of the cylinder block, reducing the structural strength of the cylinder block. A driving assembly and a compression assembly are provided in the inner cavity. The compression assembly divides the inner cavity into an intake cavity 6 and an exhaust cavity. The driving assembly is a motor located in the intake cavity 6. The main shaft of the motor is in transmission connection with the driving shaft 4. A controller assembly 2 is connected to one side of the housing. The motor is electrically connected to the controller assembly 2.

[0019] As Figure 1 and Figure 3 shown in the figure, the compression assembly includes a cylinder block, an upper plate body, a partition plate 52, a lower plate body, and a first compression cavity and a second compression cavity. The first compression cavity is located between the upper plate body and the partition plate 52. The second compression cavity is located between the lower plate body and the partition plate 52. The first compression cavity is located above the second compression cavity. An upper exhaust valve is provided above the first compression cavity. The upper exhaust valve is connected to the outside of the upper plate body. Rotors 31 and swing members 32 are provided in both the first compression cavity and the second compression cavity. The swing members 32 are connected to the rotors 31. The rotors 31 are eccentrically connected to the driving shaft 4 of the driving assembly. When the partition plate 52 closes one side of the compression cavity, the swing members 32 dynamically partition the other side of the compression cavity. One end of the swing members 32 is located within a bushing 54.

[0020] As Figure 1 and Figure 3As shown in the figure, bushing holes 53 are provided on the upper surfaces of the partition plate 52 and the lower plate body. The bushings 54 are arranged in the bushing holes 53. The partition plate 52 includes a first protruding portion protruding towards the first compression chamber. The first protruding portion is a partition limiting plate connected or integrally formed with the partition plate 52. The bushing hole 53 of the first compression chamber is provided in the first protruding portion. The lower plate body includes a second protruding portion protruding towards the second compression chamber. The second protruding portion is a lower limiting plate connected to the lower plate body. The bushing hole 53 of the second compression chamber is provided in the second protruding portion. The bushing hole 53 of the partition plate 52 is used to accommodate the swing member 32 and the bushing 54 in the first compression chamber. The bushing hole 53 of the lower plate body is used to accommodate the swing member 32 and the bushing 54 in the second compression chamber. When the rotor 31 rotates, it can drive the swing member 32 to move together, thereby realizing the change of the volume in the compression chamber and completing the compression process. The bushing 54 reduces the direct friction between the swing member 32 and the housing, improves the movement accuracy and stability of the swing member 32, and thus ensures the reliability of the long-term operation of the compressor. Through the cooperation of the bushing 54 and the swing member 32, the compression chamber is effectively divided into a low-pressure chamber and a high-pressure chamber. Utilizing the characteristic that there is no obvious hysteresis in the movement process of the swing member 32, compared with the traditional spring reset method, it can significantly reduce the leakage problem during the compression process, thereby improving the compression efficiency and stability of the compressor.

[0021] As Figure 1 and Figure 2 shown in the figure, the first compression chamber and the second compression chamber are divided into a low-pressure chamber and a high-pressure chamber by the rotor 31 and the swing member 32. The low-pressure chamber of the first compression chamber is communicated with the low-pressure chamber of the second compression chamber. The low-pressure chamber of the second compression chamber is communicated with the intake chamber 6. During operation, the refrigerant entering the low-pressure chamber is transferred to the high-pressure chamber under the influence of the rotation of the rotor 31. As the space of the high-pressure chamber continuously shrinks, the refrigerant reaches the set pressure, opens the exhaust valve provided on the upper plate body or the lower plate body, and the high-pressure refrigerant is discharged into the exhaust chamber, realizing the recycling of the refrigerant, improving the energy efficiency ratio of the air-conditioning system, facilitating the smooth flow of the refrigerant, ensuring the efficient progress of the compression process, and improving the overall performance of the compressor.

[0022] As Figure 1 shown in the figure, this R744 rotary electric compressor further includes an oil return pipe 7. An oil return channel 41 is provided inside the drive shaft 4. One end of the oil return pipe 7 extends to the bottom of the high-pressure chamber, and the other end of the oil return pipe 7 is communicated with the oil return channel 41. A plurality of oil return holes are provided on the side surface of the drive shaft 4, and the oil return holes are communicated with the oil return channel 41. By providing the oil return pipe 7, the lubricating oil accumulated at the bottom of the high-pressure chamber is transferred to the drive shaft 4, and then distributed to each bearing and other parts that need lubrication through the oil return channel 41 and the oil return holes in the drive shaft 4. Utilizing the pressure difference between the high-pressure chamber and the oil return channel 41 as the driving force, effective lubrication between components is achieved, which not only reduces the wear of each component but also improves the overall service life of the compressor, ensuring the reliability and stability of the compressor during long-term operation.

[0023] As Figure 2 shown, a filtering component is provided at the air inlet of the intake cavity 6. The filtering component includes a hollow tube body and a filter net connected to one end of the hollow tube body and covering the hollow tube body. Aiming at the problem that the use of R744 refrigerant may cause damage to internal components, by adding a filtering component at the air inlet to filter impurities in the refrigerant, it is possible to effectively reduce the impact of high-pressure gas on the internal components of the compressor without significantly reducing the intake pressure, reduce the probability of damage to the internal structure, thereby extending the service life of the compressor and reducing the probability of compressor failure.

[0024] As Figure 1 and Figure 3 shown, an upper exhaust valve is provided above the first compression cavity. The upper exhaust valve is connected to the outside of the upper plate body. An exhaust outlet is provided on the side wall of the front cover 12. When the pressure reaches the set value, the upper exhaust valve opens, and the gas flows through the exhaust outlet, the gap between the compression component and the compression cavity in sequence and enters the exhaust cavity. As Figure 4 shown, the path through which the gas flows is the exhaust passage. The cross-section of the exhaust passage is U-shaped or Z-shaped, which helps to reduce the eddy current and resistance of the refrigerant during the exhaust process, enabling the refrigerant to flow out of the compressor more smoothly, thereby improving the exhaust efficiency and the overall performance of the compressor. The compressed refrigerant can be discharged smoothly in the set direction, reducing the pressure loss, improving the exhaust efficiency of the compressor, and realizing a continuous refrigerant compression process. The low-pressure chambers of the two compression cavities are interconnected, and a higher compressor integration degree and a shorter exhaust distance are achieved through the exhaust passage, improving the working efficiency and reliability of the compressor.

[0025] Working principle: As Figures 1 - 3 shown, the drive component drives the rotor 31 to rotate through the drive shaft 4, thereby realizing the movement of the compression element. When the compressor operates, the pressure in the low-pressure cavity is lower than the pressure in the intake cavity 6. The refrigerant (such as R744) is sucked from the air-conditioning system into the low-pressure chamber of the low-pressure cavity through the intake cavity 6. Before the refrigerant enters the intake cavity 6, it will first pass through the filtering component provided at the air inlet to effectively filter impurities in the refrigerant and prevent impurities from entering the inside of the compressor.

[0026] As Figure 3As shown, during the compression process, the refrigerant enters from the low-pressure chamber. As the rotor 31 rotates, the swing member 32 reciprocates within the bushing 54, pushing the refrigerant from the low-pressure chamber into the high-pressure chamber. The rotor 31 rotates periodically within the compression chamber. As the volume increases, the refrigerant is sucked into the compression chamber; at the outlet, as the volume decreases, the refrigerant is extruded and enters the high-pressure chamber. This process repeats continuously, achieving continuous compression of the refrigerant. When the pressure of the compressed refrigerant in the high-pressure chamber reaches the preset pressure, the lower exhaust valve and the upper exhaust valve are opened respectively. The refrigerant in the second compression chamber is discharged through the exhaust passage, and the refrigerant in the first compression chamber is directly discharged into the high-pressure chamber through the upper exhaust valve.

[0027] As Figure 1 shown, during the compression process, the pressure difference between the high-pressure chamber and the oil return passage 41 serves as the driving force for oil return. The accumulated oil at the bottom of the high-pressure chamber is sucked into the oil return passage 41 inside the drive shaft 4 through the oil return pipe 7, and then distributed to various components such as bearings that require lubrication through the oil return holes.

[0028] As Figures 1 - 4 shown, the above processes of suction, compression, exhaust, and oil return are continuously cycled, enabling the continuous compression and discharge of the refrigerant within the compressor, while ensuring good lubrication of the internal components of the compressor and ensuring the stable operation of the compressor.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. R744 rotor-type electric compressor, comprising a housing and an inner cavity formed in the housing, wherein a driving assembly and a compression assembly are arranged in the inner cavity, and characterized in that: The compression assembly divides the inner cavity into an air intake cavity (6) and an air exhaust cavity, and the drive assembly is located in the air intake cavity (6); The compression assembly comprises a cylinder body, an upper plate body, a partition (52), a lower plate body, and a first compression chamber and a second compression chamber, wherein the first compression chamber is located between the upper plate body and the partition (52), the second compression chamber is located between the lower plate body and the partition (52), and the first compression chamber is located on the upper side of the second compression chamber; A rotor (31) and a swinging member (32) are disposed in the compression chamber 1 and the compression chamber 2, the swinging member (32) is connected to the rotor (31), and the rotor (31) is eccentrically connected to a driving shaft (4) of a driving assembly; One end of the swinging member (32) is located in a bushing (54), the upper surfaces of the partition plate (52) and the lower plate body are both provided with bushing holes (53), and the bushing (54) is arranged in the bushing hole (53); The compression chamber one and the compression chamber two are separated into a low-pressure chamber and a high-pressure chamber by a rotor (31) and a swinging member (32); the low-pressure chamber of the compression chamber one is connected to the low-pressure chamber of the compression chamber two, and the low-pressure chamber of the compression chamber two is connected to the air inlet chamber (6).

2. The R744 rotor type electric compressor according to claim 1, characterized in that: The partition plate (52) includes a protrusion one protruding toward the compression chamber one direction, and the bushing hole (53) of the compression chamber one is opened in the protrusion one. The lower plate body includes a protrusion two protruding toward the compression chamber two direction, and the bushing hole (53) of the compression chamber two is opened in the protrusion two.

3. The R744 rotor type electric compressor according to claim 1, characterized in that: The shell comprises a front cover (12) and a rear cover (13); the cylinder body comprises a support portion (11) extending outward; the support portion (11), the front cover (12) and the rear cover (13) extend outward to form a positioning portion (51); a plurality of positioning holes are formed on the positioning portion (51); the support portion (11), the front cover (12) and the rear cover (13) are connected to each other by bolts arranged in the positioning holes.

4. The R744 rotor type electric compressor according to claim 1, characterized in that: It also includes an oil return pipe (7), an oil return channel (41) is provided inside the drive shaft (4), one end of the oil return pipe (7) extends to the bottom of the high-pressure chamber, the other end of the oil return pipe (7) is connected to the oil return channel (41), and a plurality of oil return holes connected to the area to be lubricated are provided on the side of the drive shaft (4), and the oil return holes are connected to the oil return channel (41).

5. The R744 rotor type electric compressor according to claim 1, characterized in that: The air inlet of the air inlet cavity (6) is provided with a filter assembly.

6. The R744 rotor type electric compressor according to claim 1, characterized in that: An upper exhaust valve is arranged above the compression chamber 1, and the upper exhaust valve is connected to the outer side of the upper plate body. An exhaust outlet is opened on the side wall of the front cover (12). When the pressure reaches a set value, the upper exhaust valve opens, and the gas flows through the exhaust outlet, the gap between the compression assembly and the compression chamber in sequence and enters the exhaust chamber. The path through which the gas flows is the exhaust channel.

7. The R744 rotor type electric compressor according to claim 1, characterized in that: The driving component is a motor, the main shaft of the motor is drivingly connected to the driving shaft (4), one side of the housing is connected to a controller assembly (2), and the motor is electrically connected to the controller assembly (2).

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