Rotary compressor

Abstract

A rotary compressor comprises a shell, a motor and a compression pump, the motor is arranged in the shell, the compression pump is arranged in the shell, an oil storage area is formed between a second end face of a cylinder body of the compression pump and a bottom cover of the shell, refrigerating machine oil is stored in the oil storage area, the oil quantity of the refrigerating machine oil in the oil storage area is V, the inner diameter of a main shell is M, and the inner diameter of the main shell is M; when the distance between the bottommost surface in the bottom cover and the bottom surface of the cylinder of the compression pump is H and the circumference ratio is pi, 25% < = V / (pi (M / 2) 2H) < = 40% is satisfied. Therefore, the overall oil filling amount and the refrigerant amount can be effectively reduced, the energy efficiency is improved, and the problems in the prior art are effectively solved. In addition, the design accords with the hydrocarbon refrigerant trend, has the characteristic of simplifying the assembly process, and is beneficial for the refrigerant to play an optimal role in the system.

Description

Technical Field

[0001] This invention relates to the field of compressor construction, and more particularly to a rotary compressor. Background Technology

[0002] Existing rotary compressors mainly consist of the following components: exhaust pipe, casing, electric motor (stator and rotor), crankshaft, upper bearing, silencer, compression unit (cylinder, rings, blades), lower bearing, bottom cover, outlet pipe, receiver, and inlet pipe. The basic working principle of the compressor is as follows: When the compressor is powered on, the stator generates a magnetic field, causing the rotor to rotate. This rotates the crankshaft, causing the rings to move eccentrically within the cylinder, thereby compressing the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas. This gas is then discharged from the cylinder through the silencer into the casing. After passing through the slit edge on the outside of the stator and the gap between the rotors, it is discharged into the refrigeration cycle system through the outlet pipe.

[0003] In response to energy conservation and carbon reduction initiatives, hydrocarbon refrigerants are receiving widespread attention from the industry. A significant technical challenge arises when applying hydrocarbon refrigerants to refrigeration systems: their high flammability necessitates strict limits on their loading within the system. Therefore, it is essential to drastically reduce the amount of refrigerant within the compressor housing, thereby lowering the overall refrigerant load of the refrigeration system. In traditional compressors, sufficient lubricating oil is required to maintain a proper oil level to ensure reliable operation. However, due to the high compatibility between hydrocarbon refrigerants and lubricating oil, the lubricating oil often contains a high proportion of refrigerant, potentially leading to insufficient refrigerant levels during system operation. Therefore, reducing the amount of lubricating oil inside the compressor, and consequently lowering the refrigerant content, is an effective solution. This not only reduces the overall refrigerant load but also ensures system safety and operational efficiency.

[0004] However, current rotary compressors require lubricating oil to maintain the oil level inside the compressor in order to ensure reliable operation. Because R290 refrigerant and lubricating oil have good compatibility, the more oil the compressor is filled with, the more R290 refrigerant will dissolve in the oil. This can negatively impact compressor performance and lead to decreased efficiency, a problem that developers and researchers in the compressor and related industries must continue to overcome and resolve. Summary of the Invention

[0005] Therefore, the main objective of this invention is to provide a rotary compressor that reduces the amount of oil filling in the compressor, reduces the amount of refrigerant dissolved in the oil, thereby effectively reducing the amount of refrigerant charged and improving the safety of the operation of the flammable refrigerant compressor, thus solving the problems existing in the prior art.

[0006] To achieve the aforementioned objective, this invention proposes a rotary compressor, comprising:

[0007] A shell, consisting of a main shell, a top cover and a bottom cover;

[0008] An electric motor is housed within this housing;

[0009] A compression pump, disposed within the housing and located below the electric motor, the compression pump comprising:

[0010] A cylinder body has a first end face and a second end face. A compression chamber is provided at the center of the cylinder body. A blade groove, a spring hole and a suction hole are provided on the wall of the compression chamber. The spring hole communicates with the blade groove. The suction hole is independent of the blade groove and the spring hole.

[0011] One ring is rotatably disposed within the compression chamber of the cylinder;

[0012] A blade is reciprocally disposed in the blade groove of the cylinder, and the front end of the blade abuts against the outer peripheral surface of the ring.

[0013] At least one spring is provided in each of the spring holes of the blade, such that the front end of the blade abuts against the outer peripheral surface of the ring;

[0014] An upper support is installed inside the housing and located above the cylinder;

[0015] A support is disposed within the housing and located below the cylinder block; and

[0016] A crankshaft is disposed within the housing, and the crankshaft is fitted with the upper support, the motor, the ring, and the lower support;

[0017] The second end face of the cylinder of the compressor pump and the bottom cover of the housing form an oil storage area for storing refrigeration oil. The amount of refrigeration oil in the oil storage area is V. The inner diameter of the main housing is M. The distance between the bottom surface of the bottom cover and the bottom surface of the cylinder of the compressor pump is H. And with π as the value of pi, the following conditions are met: 25% ≤ V / (π(M / 2)2H) ≤ 40%.

[0018] Preferably, the bottom cover has a joint portion corresponding to the inner edge wall of the main shell, the joint portion being bent into a U-shape; and a step portion, the step portion being a hollow structure.

[0019] Preferably, the outer ring of the joint of the bottom cover is provided with a plurality of protrusions, and when the joint of the bottom cover is located inside the bottom end of the main shell, the bottom end of the main shell is connected to the protrusions.

[0020] Preferably, the number of protrusions in the joint is three or more, and these protrusions are arranged at equal intervals.

[0021] Preferably, it further includes a plurality of fasteners, each disposed at a position where a protrusion of the bottom cover connects to the bottom end of the main shell, so as to fix the bottom cover to the main shell.

[0022] Preferably, the fastener is a spot-welded structure welded between the protrusions of the bottom cover joint and the bottom end of the main shell.

[0023] Preferably, the stepped portion of the bottom cover consists of an annular area and a recessed area, the recessed area being located in the annular area and extending downward.

[0024] Preferably, the recessed area is an annular structure and is located at the center of the annular area. The radial end of the recessed area is connected to the radial outer end of the annular area, and the recessed area is a downward extending structure.

[0025] Preferably, the inner diameter of the annular region is M1, and the inner diameter of the recessed region is M2, and the condition 2≤M1 / M2≤3 is satisfied.

[0026] As can be seen from the above structure, the beneficial effects of this invention are as follows: An improved oil-reducing bottom cover design is proposed, applicable to all series of rotary compressors. While maintaining the original performance, it reduces the oil volume between the cylinder and the bottom cover by 55%. An oil storage area is formed between the second end face of the compressor cylinder and the bottom cover of the housing, where refrigerant oil is stored. The oil volume in this storage area is V, the inner diameter of the main housing is M, and the distance between the bottommost surface of the bottom cover and the bottom surface of the compressor cylinder is H. Furthermore, with pi as π, the following conditions are met: 25% ≤ V / (π(M / 2)²H) ≤ 40%. This effectively reduces the overall oil and refrigerant volume, improves energy efficiency, and effectively solves the problems faced by existing technologies. In addition, this design conforms to the trend of hydrocarbon refrigerants, simplifies the assembly process, and helps the refrigerant play its optimal role in the system. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the rotary compressor of the present invention.

[0028] Figure 2 For the present invention Figure 1 A partial sectional view.

[0029] Figure 3 This is a cross-sectional view of the compression pump of the rotary compressor of the present invention.

[0030] Figure 4 This is a perspective view of the bottom cover of the rotary compressor of the present invention.

[0031] Figure 5 This is a top view of the bottom cover of the rotary compressor of the present invention.

[0032] Figure 6 This is a cross-sectional view of the bottom cover of the rotary compressor of the present invention.

[0033] Symbol explanation:

[0034]

[0035] Detailed Implementation

[0036] To understand the features, content, advantages, and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and embodiments. The drawings used are for illustrative purposes only and to assist in the description. They may not represent the actual proportions and precise configurations of the present invention after implementation. Therefore, the proportions and configurations of the accompanying drawings should not be used to interpret or limit the scope of the present invention in actual implementation.

[0037] The advantages, features, and technical methods of the present invention will be more readily understood by referring to the exemplary embodiments and accompanying drawings. The present invention may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, the embodiments provided will enable those skilled in the art to more thoroughly and completely convey the scope of the invention, and the invention will be defined only by the appended claims.

[0038] First, please refer to Figures 1 to 6 The rotary compressor 1 of the present invention includes a housing 11, an electric motor 12 and a compression pump 13. The rotary compressor 1 of the present invention is presented in the form of a vertical compressor.

[0039] The housing 11 is a hollow body, consisting of a main shell 111, a top cover 112, and a bottom cover 113. The housing 11 is used to house the motor 12 and the compressor pump 13, etc. An outlet pipe 1121 is provided on the housing 11. The outlet pipe 1121 is located at either the top cover 112 or the main shell 111. In this figure, the outlet pipe 1121 is located at the top cover 112. The housing 11 can be any existing structural form available on the market, and its structural form is not limited.

[0040] As mentioned above, the structure of the bottom cover 113 is further described as follows: the bottom cover 113 has a joint portion 1131, which corresponds to the inner edge wall of the main shell 111, and the joint portion 1131 is bent into a U-shaped structure; and a step portion 1132, which is connected to the joint portion 1131, and the step portion 1132 is a hollow structure. Furthermore, the outer ring of the joint portion 1131 of the bottom cover 113 is provided with a plurality of protrusions 11311. When the joint portion 1131 of the bottom cover 113 is located inside the bottom end of the main shell 111, the bottom end of the main shell 111 is connected to the protrusions 11311. The shape of each protrusion 11311 of the joint portion 1131 is not limited. The number of protrusions 11311 of the joint portion 1131 is three or more, and these protrusions 11311 are arranged at equal distances. If the number of protrusions 11311 of the joint portion 1131 is three, they are arranged in an equilateral triangle. The joint portion 1131 and the step portion 1132 are integrally formed.

[0041] As mentioned above, the device further includes a plurality of fasteners 114, which are respectively disposed at the connection points between the protrusions 11311 of the joint portion 1131 of the bottom cover 113 and the bottom end of the main shell 111, for fixing the bottom cover 113 to the main shell 111. Furthermore, the fasteners 114 are spot-welded to the joint portion 1131 of the bottom cover 113 and the bottom end of the main shell 111.

[0042] As mentioned above, the stepped portion 1132 of the bottom cover 113 consists of an annular region 11321 and a recessed region 11322, with the recessed region 11322 located within the annular region 11321 and extending downwards. Furthermore, the recessed region 11322 is annular in structure, situated at the center of the annular region 11321. The radial end of the recessed region 11322 connects to the radial outer end of the annular region 11321, and the recessed region 11322 extends downwards. The inner diameter of the annular region 11321 is M1, and the inner diameter of the recessed region 11322 is M2, satisfying 2 ≤ M1 / M2 ≤ 3. The annular region 11321 and the recessed region 11322 are integrally formed.

[0043] The motor 12 is disposed within the housing 11. The motor 12 includes a stator 121, which is fixed to the inner wall of the main shell 111 of the housing 11; and a rotor 122, which is rotatably disposed inside the stator 121. The motor 12 can be any existing structural form available on the market and its structural form is not limited.

[0044] The compression pump 13 is disposed within the main housing 111 of the housing 11, located below the motor 12. The compression pump 13 includes a cylinder 131, which is also disposed within the main housing 111 and located below the motor 12. The cylinder 131 has a first end face 1311 and a second end face 1312. A compression chamber 1313 extending through both ends is located at the center of the cylinder 131. A vane groove 1314, a spring hole 1315, and a suction port 1316 are formed on the wall of the compression chamber 1313. The spring hole 1315 does not completely penetrate the compression chamber 1314. The cylinder 13 has a cavity wall, with the spring hole 1315 communicating with the blade groove 1314. The suction port 1316 is independent of and does not communicate with the blade groove 1314 or the spring hole 1315. A ring 132 is rotatably disposed in the compression cavity 1313 of the cylinder 131. A blade 133 is reciprocally disposed in the blade groove 1314 of the cylinder 131, with the front end of the blade abutting against the outer peripheral surface of the ring 132, dividing the compression cavity 1313 into a suction chamber and a compression chamber. At least one spring 134 is disposed in each of the spring holes 1315, and the spring 134 is located on the blade. The rear end of the blade 133 causes the front end of the blade 133 to abut against the outer peripheral surface of the ring 132, while the rear end of the spring 134 abuts against the inner wall of the main shell 111 of the housing 11. The spring 134 is extendable and retractable within the spring hole 1315, causing the front end of the blade 133 to abut against the eccentrically rotating ring 132 in the compression chamber 1313 and reciprocate. An upper support 135 is disposed within the housing 11 and located above the cylinder 131; a lower support 136 is disposed within the housing 11 and located below the cylinder 131; and a crankshaft 137 extends longitudinally... The crankshaft 137 is formed by extending to an appropriate length and is disposed within the housing 11. The crankshaft 137 has at least one eccentric portion 1371, which is located at an appropriate distance from the lower end of the crankshaft 137, thereby defining an upper shaft section 1372 and a lower shaft section 1373. The upper shaft section 1372 is fitted with the upper support 135 and the rotor 122 of the motor 12, while the lower shaft section 1373 is fitted with the lower support 136. Each eccentric portion 1371 is fitted with the ring 132 of each cylinder block 131. The compression pump 13 can be any existing structural type available on the market and its structural type is not limited.

[0045] It is worth mentioning that the number of cylinders 131 and rings 132 is not limited; that is, the compression pump 13 can be a single-cylinder, double-cylinder, or three-cylinder type, and the cylinders 131 and rings 132 can be set to one, two, or three or more respectively. The number of rings 132 depends on the type of cylinder 131 and is rotatably arranged in the compression chamber 1313 of the cylinder 131. In this figure, the compression pump 13 is a single-cylinder type.

[0046] To further explain, an oil storage area 110 is formed between the second end face 1312 of the cylinder 131 of the compressor pump 13 and the bottom cover 113 of the housing 11. The oil storage area 110 is used to store refrigeration oil. The amount of refrigeration oil in the oil storage area 110 is V. The inner diameter of the main housing 111 is M. The distance between the bottom surface of the bottom cover 113 and the bottom surface of the cylinder 131 of the compressor pump 13 is H. With π as the circumference, and satisfying 25% ≤ V / (π(M / 2)2H) ≤ 40%, the overall filling oil and refrigerant amount of the rotary compressor 1 are reduced.

[0047] Based on the above structure, further explanation is provided below:

[0048] In this embodiment, the rotary compressor 1 further includes a filter bottle 14 made of metal. The filter bottle 14 is formed by extending longitudinally for an appropriate length, and its interior defines an accommodating space 140. The top of the filter bottle 14 is provided with an inlet pipe 141, and at least one filter bottle inner pipe 142 is provided inside the filter bottle 14. The filter bottle inner pipe 142 extends to the outside of the filter bottle 14 and extends into the housing 11, and is connected to the suction port 1316 of the cylinder 131 of the compressor pump 13, so that the filter bottle 14 is located on one side of the housing 11. The low-pressure gas (refrigerant) in the filter bottle 14 is transferred to the suction port 1316 of the cylinder 131 of the compressor pump 13 through the filter bottle inner pipe 142, and then transferred to the compression chamber 1313 for continuous compression to a certain pressure, and then output to the space inside the housing 11.

[0049] To further explain, the inner tube 142 of the filter bottle 14 is connected to the cylinder 131 of the compressor pump 13. The inlet pipe 141 of the filter bottle 14 is connected to the outlet pipe 1121 of the housing 11 of the rotary compressor 1 to form a refrigeration cycle system. The number of inner tubes 142 of the filter bottle 14 is not limited, that is, it is determined by the type of compressor pump 13, such as single-cylinder, double-cylinder, or three-cylinder or more. The filter bottle 14 can be any existing structural form on the market, and its structural form is not limited.

[0050] In this embodiment, the rotary compressor 1 further includes an electrical connector assembly 15, which is disposed on the main housing 111 or the top cover 112. As shown in the figure, the electrical connector assembly 15 is disposed on the top cover 112 and is coupled to the motor 12 and electrically connected. The electrical connector assembly 15 can be any existing structural form available on the market and is not limited to any particular structural form.

[0051] In this structure, when the rotor 122 of the motor 12 rotates, it drives the crankshaft 137 to rotate eccentrically, so that the eccentric part 1371 of the crankshaft 137 can drive the ring 132 to rotate in the compression chamber 1313 of the cylinder 131. The upper shaft section 1372 and the lower shaft section 1373 of the crankshaft 137 support the upper support 135 and the lower support 136 and make them rotate at high speed, so that the compressor pump 13 is in operation. The gaseous refrigerant is drawn into the compression chamber 1313 inside the cylinder 131 of the compressor pump 13 and is continuously compressed to a certain pressure before the compressed refrigerant is discharged. However, in order to reduce the amount of lubricating oil (refrigeration oil) filling the rotary compressor 1, and thus reduce the refrigerant content inside the rotary compressor 1. Therefore, an improved oil-reducing bottom cover design is proposed, applicable to the entire series of rotary compressors 1. This design reduces the oil volume between the cylinder 131 and the bottom cover 113 by 55% while maintaining the original performance (for example, if the structure of this invention is used, assuming the refrigerant in the housing 11 is R290, and the original oil filling volume is 140cc, it can be reduced to 60cc). It defines an oil storage area 10 between the second end face 1312 of the cylinder 131 of the compressor pump 13 and the bottom cover 113 of the housing 11. This oil storage area 10 stores refrigeration oil, and the oil volume in the oil storage area 10 is V. The main shell 111 of the housing 11... The inner diameter is M, and the distance between the bottom surface of the bottom cover 113 and the bottom surface of the cylinder 131 of the compressor pump 13 is H. To further explain, the bottom surface of the bottom cover 113 is the bottom surface of the recessed area 11322 of the step portion 1132 of the bottom cover 113, and the bottom surface of the cylinder 131 of the compressor pump 13 is the second end face 1312 of the cylinder 131 of the compressor pump 13. That is to say, the distance between the second end face 1312 of the cylinder 131 of the compressor pump 13 and the bottom surface of the recessed area 11322 of the bottom cover 113; and when pi is set as π, and 25% ≤ V / (π(M / 2)2H) ≤ 40%. Under these constraints, the space of the oil storage area 110 will be reduced, but the refrigeration oil level can still be maintained, reducing refrigerant mixing into the refrigeration oil. This allows for the utilization of a limited amount of refrigerant to generate maximum cooling capacity, effectively reducing the overall filling oil and refrigerant volume, improving energy efficiency, and eliminating the need for adding external objects (such as weight blocks or spacers) inside the bottom cover 113. This also effectively solves the problems faced by existing technologies. Furthermore, this design aligns with the trend towards hydrocarbon refrigerants, simplifies the assembly process, and helps the refrigerant perform optimally within the system.

[0052] It should be noted that the rotary compressor 1 structure of the present invention is not only applicable to rotary compressor 1 using R290 refrigerant, but also applicable to rotary compressor 1 using other environmentally friendly refrigerants.

[0053] In light of the above, the present invention provides a rotary compressor 1, which reduces the amount of oil filling in the compressor, reduces the amount of refrigerant dissolved in the oil, thereby effectively reducing the amount of refrigerant charged, improving the safety of operation of the flammable refrigerant compressor, and improving the efficiency of the rotary compressor 1.

[0054] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and patent specification of the present invention shall still fall within the scope of the patent of the present invention.

Claims

1. A rotary compressor, characterized in that, include: A shell, consisting of a main shell, a top cover and a bottom cover; An electric motor is housed within this housing; A compression pump, disposed within the housing and located below the electric motor, the compression pump comprising: A cylinder body has a first end face and a second end face. A compression chamber is provided at the center of the cylinder body. A blade groove, a spring hole and a suction hole are provided on the wall of the compression chamber. The spring hole communicates with the blade groove. The suction hole is independent of the blade groove and the spring hole. One ring is rotatably disposed within the compression chamber of the cylinder; A blade is reciprocally disposed in the blade groove of the cylinder, and the front end of the blade abuts against the outer peripheral surface of the ring. At least one spring is provided in each of the spring holes of the blade, such that the front end of the blade abuts against the outer peripheral surface of the ring; An upper support is installed inside the housing and located above the cylinder; A support is disposed within the housing and located below the cylinder block; and A crankshaft is disposed within the housing, and the crankshaft is fitted with the upper support, the motor, the ring, and the lower support; The second end face of the cylinder of the compressor pump and the bottom cover of the housing form an oil storage area for storing refrigeration oil. The amount of refrigeration oil in the oil storage area is V. The inner diameter of the main housing is M. The distance between the bottom surface of the bottom cover and the bottom surface of the cylinder of the compressor pump is H. And with π as the value of pi, the following conditions are met: 25% ≤ V / (π(M / 2)2H) ≤ 40%.

2. The rotary compressor as described in claim 1, characterized in that, The bottom cover has a joint portion corresponding to the inner edge wall of the main shell, the joint portion being bent into a U-shape; and a step portion, the step portion being a hollow structure.

3. The rotary compressor as described in claim 2, characterized in that, The outer ring of the bottom cover joint is provided with multiple protrusions. When the bottom cover joint is located inside the bottom end of the main shell, the bottom end of the main shell is connected to the protrusions.

4. The rotary compressor as described in claim 3, characterized in that, The number of protrusions in the joint is three or more, and these protrusions are arranged at equal intervals.

5. The rotary compressor as described in claim 4, characterized in that, Furthermore, it includes multiple fasteners, which are respectively disposed at the joint of the bottom cover and the connection point of the bottom end of the main shell, so as to fix the bottom cover to the main shell.

6. The rotary compressor as described in claim 5, characterized in that, The fastener is a spot-welded structure, welded to the protrusions of the bottom cover joint between the bottom end of the main shell and the bottom of the main shell.

7. The rotary compressor as described in claim 2, characterized in that, The stepped portion of the bottom cover consists of an annular area and a recessed area, with the recessed area located within the annular area and extending downwards.

8. The rotary compressor as described in claim 7, characterized in that, The recessed area is a ring structure and is located at the center of the ring area. The radial end of the recessed area is connected to the radial outer end of the ring area. The recessed area is a downward extending structure.

9. The rotary compressor as described in claim 7, characterized in that, The inner diameter of the annular region is M1, and the inner diameter of the concave region is M2, and 2≤M1 / M2≤3 is satisfied.

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