TWM663338U - Rotary compressor - Google Patents

Abstract

V/(π(M/2)²H)

40%；如此一來，能有效降低整體填充油量和冷媒量，提高能效，並有效解決了先前技術面臨的問題。此外，該設計符合碳氫冷媒趨勢，具有簡化裝配過程的特點，有助於冷媒在系統中發揮最佳作用。 A rotary compressor comprises a housing, an electric motor disposed in the housing, and a compression pump disposed in the housing, wherein an oil storage area is formed between the second end surface of the cylinder of the compression pump and the bottom cover of the housing, and the oil storage area is used to store refrigeration oil, and 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 bottommost surface in the bottom cover and the bottom surface of the cylinder of the compression pump is H, and when pi is set to π, and 25% is satisfied

V/(π(M/2) ² H)

40%; thus, the overall filling oil and refrigerant volume can be effectively reduced, energy efficiency can be improved, and the problems faced by previous technologies can be effectively solved. In addition, this design conforms to the trend of hydrocarbon refrigerants, has the characteristics of simplifying the assembly process, and helps the refrigerant to play the best role in the system.

Description

Rotary compressor

The new invention relates to the field of compressor structure, and in particular to a rotary compressor.

According to the existing rotary compressor, the main components are: exhaust pipe, casing, motor (stator, rotor), crankshaft, upper bearing, silencer, compression unit (cylinder, ring, blade), lower bearing, bottom cover, outlet pipe, liquid reservoir 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, driving the crankshaft, and causing the ring to move eccentrically in the cylinder, thereby compressing the low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas, and then discharged from the cylinder through the silencer to the casing. Then, after passing through the cut edge of the outer side of the stator and the gap between the rotors, it is discharged into the refrigeration circulation system through the outlet pipe.

In response to the issue of energy conservation and carbon reduction, hydrocarbon refrigerants are receiving widespread attention from the industry. When using hydrocarbon refrigerants in refrigeration systems, there is an important technical challenge: hydrocarbon refrigerants are highly flammable, which requires strict restrictions on the amount of refrigerant filled in the refrigeration system. Therefore, the amount of refrigerant in the compressor casing must be greatly reduced, thereby reducing the amount of refrigerant filled in the entire refrigeration system. In a compressor with a traditional structure, in order to ensure the reliability of the compressor operation, it is necessary to fill it with enough lubricating oil to ensure the height of the oil level inside the compressor. However, due to the good compatibility between hydrocarbon refrigerant and lubricant, the lubricant will contain a higher proportion of refrigerant, which may lead to insufficient refrigerant when the refrigeration system is running. Therefore, reducing the amount of lubricant filling inside the compressor and thus reducing the refrigerant content inside the compressor is an effective way to solve this problem. This not only reduces the refrigerant filling amount of the entire refrigeration system, but also ensures the safety and operating efficiency of the system.

However, in order to ensure the reliability of operation, the current rotary compressor needs to be filled with lubricating oil to maintain the oil level inside the compressor. Since R290 refrigerant and lubricating oil have good compatibility, the more oil is filled into the compressor, the more R290 refrigerant will be dissolved in the refrigeration oil, which will have a certain impact on the performance of the compressor and lead to a decrease in work efficiency. This is still a problem that developers and researchers in the compressor and other related industries must continue to overcome and solve.

In view of this, the author has devoted himself to the research and application of the above existing technologies, trying his best to solve the above problems, which has become the goal of the author's improvement.

Therefore, the main purpose of the present invention is to provide a rotary compressor, reduce the oil filling of the compressor, reduce the amount of refrigerant dissolved in the oil, thereby effectively reducing the refrigerant filling amount and improving the safety of the operation of the combustible refrigerant compressor, so as to solve the problems existing in the above-mentioned prior art.

In order to achieve the above-mentioned purpose, the present invention proposes a rotary compressor, comprising: a casing, which is composed of a main casing, a top cover and a bottom cover;

A motor disposed in the housing;

A compression pump is disposed in the housing and located below the motor, and the compression pump includes;

A cylinder body is formed with 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 cavity wall of the compression chamber. The spring hole is connected to the blade groove, and the suction hole is independent of the blade groove and the spring hole and is not connected to each other;

A ring rotatably disposed in the compression chamber of the cylinder;

A blade is reciprocatingly 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 disposed in each of the spring holes of the blade, so that the front end of the blade abuts against the outer peripheral surface of the ring;

An upper support is disposed in the housing and located above the cylinder;

A lower support is disposed in the housing and located below the cylinder; and

A crankshaft is disposed in the housing, and the crankshaft is provided for the upper support, the motor, the ring and the lower support to be mounted;

V/(π(M/2)²H)

40%。 An oil storage area is formed between the second end surface of the cylinder of the compression pump and the bottom cover of the housing, and the oil storage area is used to store 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 compression pump is H, and when pi is set to π, and 25% is satisfied

V/(π(M/2) ² H)

40%.

Preferably, the bottom cover has a joint portion corresponding to the inner edge wall of the main shell, the joint portion is bent into a U-shaped structure; and a step portion, the step portion is a hollow structure.

Preferably, the outer ring of the joint portion of the bottom cover is provided with a plurality of protrusions, and when the joint portion of the bottom cover is arranged in the bottom end of the main shell, the bottom end of the main shell is connected to the protrusions.

Preferably, the number of protrusions on the joint portion is three or more, and the protrusions are arranged at equal distances.

Preferably, it further includes a plurality of fixing parts, which are respectively arranged at the positions where each protrusion of the joint portion of the bottom cover is connected with the bottom end of the main shell, so as to fix the bottom cover to the main shell.

Preferably, the fixing member is a spot welding structure welded between each protrusion of the joint portion of the bottom cover and the bottom end of the main shell.

Preferably, the step portion of the bottom cover is composed of an annular area and a recessed area, and the recessed area is located in the annular area and extends downward.

Preferably, the recessed area is an annular structure and is disposed 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. The recessed area is a structure extending downward.

M1/M2

3。 Preferably, the inner diameter of the annular region is M1, the inner diameter of the concave region is M2, and 2

M1/M2

3.

V/(π(M/2)2H)

40%；如此一來，能有效降低整體填充油量和冷媒量，提高能效，並有效解決了先前技術面臨的問題。此外，該設計符合碳氫冷媒趨勢，具有簡化裝配過程的特點，有助於冷媒在系統中發揮最佳作用。 Through the above structure, it can be seen that the beneficial effects of the present invention are as follows: an improved oil reduction bottom cover design is proposed, which is applicable to the whole series of rotary compressors, and can reduce 55% of the oil volume between the cylinder body and the bottom cover while maintaining the original performance, and define an oil storage area between the second end surface of the cylinder body of the compression pump and the bottom cover of the housing, and the oil storage area is used to store the refrigeration oil, and the oil volume of the refrigeration oil in the oil storage area is V, the inner diameter of the main housing is M, the distance value between the bottommost surface in the bottom cover and the bottom surface of the cylinder body of the compression pump is H, and when pi is set to π, and meets 25%

V/(π(M/2)2H)

40%; thus, the overall filling oil and refrigerant volume can be effectively reduced, energy efficiency can be improved, and the problems faced by previous technologies can be effectively solved. In addition, this design conforms to the trend of hydrocarbon refrigerants, has the characteristics of simplifying the assembly process, and helps the refrigerant to play the best role in the system.

1: Rotary compressor

11: Shell

110: Oil storage area

111: Main shell

112: Top cover

1121:Export pipe

113: Bottom cover

1131: Joint

11311: Bump

1132: Taiwan Class Department

11321: Ring area

11322: Depression area

114:Fixer

12: Electric motor

121: Stator

122: Rotor

13: Compression pump

131: Cylinder body

1311: First end face

1312: Second end face

1313: Compression chamber

1314: Blade slot

1315: Spring hole

1316: Inlet

132: Ring

133:Leaves

134: Spring

135: Upper support

136: Lower support

137: Crankshaft

1371: Eccentricity

1372: Upper shaft section

1373: Lower shaft section

14: Filter bottle

140: Storage space

141: Inlet pipe

142: Inner tube of filter bottle

15:Electrical connector assembly

H: Spacing

M: Inner diameter

M1: Inner diameter

M2: Inner diameter

V: Oil volume

Figure 1 is a cross-sectional view of the new rotary compressor.

Figure 2 is a partial cross-sectional view of Figure 1 of the new model.

Figure 3 is a cross-sectional view of the compressor pump of the new rotary compressor.

Figure 4 is a three-dimensional diagram of the bottom cover of the new rotary compressor.

Figure 5 is a top view of the bottom cover of the new rotary compressor.

Figure 6 is a cross-sectional view of the bottom cover of the new rotary compressor.

In order to understand the features, contents, advantages and effects of the present invention, the present invention is described in detail with the help of diagrams and in the form of embodiments as follows. The diagrams used are only for illustration and auxiliary instructions, and may not be the actual proportions and precise configurations of the present invention after implementation. Therefore, the proportions and configurations of the attached diagrams should not be interpreted to limit the scope of rights of the present invention in actual implementation.

The advantages, features and technical methods of the present invention will be described in more detail with reference to the exemplary embodiments and the attached drawings for easier understanding, and the present invention may be implemented in different forms, so it should not be understood to be limited to the embodiments described here. On the contrary, for those with ordinary knowledge in the relevant technical field, the provided embodiments will make this disclosure more thorough and comprehensive and completely convey the scope of the present invention, and the present invention will only be defined by the scope of the attached patent application.

First, please refer to Figures 1 to 6, which are the new "rotary compressor". The rotary compressor 1 includes: a housing 11, a motor 12 and a compression pump 13. The new rotary compressor 1 is a vertical compressor.

The housing 11 is a hollow body as a whole. The housing 11 is composed of a main housing 111, a top cover 112 and a bottom cover 113. The housing 11 is used to accommodate the motor 12, the compression pump 13 and other components. The housing 11 is provided with an outlet pipe 1121. The outlet pipe 1121 is provided at any place of the top cover 112 or the main housing 111. In this figure, the outlet pipe 1121 is provided at the top cover 112. The housing 11 can be of various existing structural types on the market, and its structural type is not limited.

As mentioned above, the structure of the bottom cover 113 is further described. The bottom cover 113 has a joint portion 1131, which corresponds to the inner edge wall of the main shell 111 and is bent into a U-shaped structure; and a step portion 1132, which is connected to the joint portion 1131 and is a hollow structure. In addition, the outer ring of the joint part 1131 of the bottom cover 113 is provided with a plurality of protrusions 11311. When the joint part 1131 of the bottom cover 113 is arranged in 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 part 1131 is not limited. The number of protrusions 11311 of the joint part 1131 is three or more, and the protrusions 11311 are arranged at equal distances. If the number of protrusions 11311 of the joint part 1131 is three, they are arranged in an equilateral triangle; and the joint part 1131 and the step part 1132 are integrally formed.

As mentioned above, it further includes a plurality of fixing members 114, and these fixing members 114 are respectively arranged at the positions where the protrusions 11311 of the joint portion 1131 of the bottom cover 113 and the bottom end of the main shell 111 are connected, so as to fix the bottom cover 113 to the main shell 111. Furthermore, the fixing member 114 is a spot welding structure to be welded between the protrusions 11311 of the joint portion 1131 of the bottom cover 113 and the bottom end of the main shell 111.

M1/M2

3；而該環形區11321與該凹陷區11322為一體成形製作。 As mentioned above, the step portion 1132 of the bottom cover 113 is composed of an annular area 11321 and a recessed area 11322, and the recessed area 11322 is located in the annular area 11321 and extends downward. Furthermore, the recessed area 11322 is an annular structure, and the recessed area 11322 is set at the center of the annular area 11321. The radial end of the recessed area 11322 is connected to the radial outer end of the annular area 11321, and the recessed area 11322 is a structure extending downward. The inner diameter of the annular area 11321 is M1, and the inner diameter of the recessed area 11322 is M2, and it satisfies 2

M1/M2

3; the annular area 11321 and the recessed area 11322 are integrally formed.

The motor 12 is disposed in the housing 11. The motor 12 includes a stator 121 fixed to the inner wall of the main housing 111 of the housing 11; and a rotor 122 rotatably disposed on the inner side of the stator 121; wherein the motor 12 can be of various existing structural types on the market, and its structural type is not limited.

The compression pump 13 is disposed in the main housing 111 of the housing 11 and is located below the motor 12. The compression pump 13 includes a cylinder 131 disposed in the main housing 111 of the housing 11 and is located below the motor 12. The cylinder 131 is formed with a first end face 1311 and a second end face 1312. A compression chamber 1313 penetrating the upper and lower ends is provided at the center of the cylinder 131. A blade groove 1314, a spring hole 1315 and a suction port 1316 are provided on the cavity wall of the compression chamber 1313. The spring hole 1315 does not completely penetrate the compression chamber 1311. 3, the spring hole 1315 is in communication with the blade groove 1314, the suction port 1316 is independent of the blade groove 1314 and the spring hole 1315 and is not in communication with each other; a ring 132, the ring 132 is rotatably disposed in the compression chamber 1313 of the cylinder body 131; a blade 133, the blade 133 is reciprocally disposed in the blade groove 1314 of the cylinder body 131, the front end of the blade 133 abuts against the outer peripheral surface of the ring 132, and the compression chamber 1313 is divided 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 between the blades. The rear end of the spring 134 abuts against the outer peripheral surface of the ring 132, and the rear end of the spring 134 abuts against the inner wall of the main shell 111 of the shell 11. The spring 134 can be extended and retracted in the spring hole 1315, so that the front end of the blade 133 abuts against the eccentrically rotating ring 132 in the compression chamber 1313 and reciprocates; an upper support 135, which is arranged in the shell 11 and located above the cylinder 131; a lower support 136, which is arranged in the shell 11 and located below the cylinder 131; and a crankshaft 137 extending in the longitudinal direction. The crankshaft 137 is formed with an appropriate length, and is disposed in the housing 11, wherein the crankshaft 137 has at least one eccentric portion 1371, and the eccentric portion 1371 is located at an appropriate distance from the lower end of the crankshaft 137, so that the crankshaft 137 defines an upper shaft section 1372 and a lower shaft section 1373; the upper shaft section 1372 is provided for the upper support 135 and the rotor 122 of the motor 12 to be sleeved, the lower shaft section 1373 is provided for the lower support 136 to be sleeved, and each eccentric portion 1371 is provided for the ring 132 of each cylinder 131 to be sleeved; wherein the compression pump 13 can be various existing structural types on the market, and its structural type is not limited.

In particular, there is no limit to the number of the cylinder 131 and the ring 132; that is, the compression pump 13 can be a single-cylinder, double-cylinder or three-cylinder or more type, and the cylinder 131 and the ring 132 can be set to one, two or more than three correspondingly. The number of the ring 132 is determined by the type of the 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.

V/(π(M/2)2H)

40%，達到該迴轉式壓縮機1整體填充油量、冷媒量降低。 To further explain, an oil storage area 110 is formed between the second end surface 1312 of the cylinder 131 of the compression pump 13 and the bottom cover 113 of the housing 11, and the oil storage area 110 is for storing 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 compression pump 13 is H, and when pi is set to π, and 25% is satisfied.

V/(π(M/2)2H)

40%, thereby achieving a reduction in the overall amount of oil and refrigerant filled in the rotary compressor 1.

Based on the above structure, we further explain as follows:

In this embodiment, the rotary compressor 1 further includes a filter bottle 14, which is made of metal material. The filter bottle 14 is formed by extending a suitable length in the longitudinal direction, and defines a receiving space 140 inside. The top of the filter bottle 14 is provided with an inlet pipe 141, and the filter bottle 14 is provided with at least one filter bottle inner tube 142, which extends to the outside of the filter bottle 14 and extends into the housing. 11, and connected to the suction port 1316 of the cylinder 131 of the compression pump 13, so that the filter bottle 14 is located on one side of the housing 11, and the low-pressure gas (refrigerant) in the filter bottle 14 is transmitted to the suction port 1316 of the cylinder 131 of the compression pump 13 through the inner tube 142 of the filter bottle, and then transmitted to the compression chamber 1313 to be continuously compressed to a certain pressure, and then output to the space in the housing 11.

To further explain, the filter bottle inner tube 142 of the filter bottle 14 is connected to the cylinder 131 of the compression pump 13, and 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 circulation system. The number of the filter bottle inner tube 142 of the filter bottle 14 is not limited, that is, it is determined by the single-cylinder, double-cylinder or three-cylinder or more compression pump 13; wherein, the filter bottle 14 can be various existing structural types on the market, and its structural type is not limited.

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. This figure shows that the electrical connector assembly 15 is disposed on the top cover 112 and is coupled to the motor 12 for electrical connection; wherein, the electrical connector assembly 15 can be various existing structural types on the market, and its structural type is not limited.

V/(π(M/2)2H)

40%。於此條件限制下，會降低該儲油區110的空間，但仍可維持冷凍機油液面高度，降低冷媒混入冷凍機油，可以發揮有限冷媒量，產生最大的冷房能力，達到能有效降低整體填充油量和冷媒量，提高能效，也無需在該底蓋113內添加外物(例如：質量塊、墊塊等)，並有效解決了先前技術面臨的問題。此外，該設計符合碳氫冷媒趨勢，具有簡化裝配過程的特點，有助於冷媒在系統中發揮最佳作用。需要說明的是，本新型的迴轉式壓縮機1結構不僅適用於使用R290製冷劑的迴轉式壓縮機1，也同樣適用於使用其他環保製冷劑的迴轉式壓縮機1。 In this structure, when the rotor 122 of the motor 12 rotates, the crankshaft 137 is driven to rotate eccentrically, so that the eccentric portion 1371 of the crankshaft 137 can drive the ring 132 to rotate in the compression chamber 1313 of the cylinder body 131, and the upper shaft section 1372 and the lower shaft section 1373 of the crankshaft 137 are used to support the upper support 135 and the lower support 136. The high-speed operation causes the compression pump 13 to be in operation as a whole, so that the gas refrigerant is sucked into the compression chamber 1313 inside the cylinder 131 of the compression pump 13, and is continuously compressed to a certain pressure, and then the compressed refrigerant is discharged; however, in order to reduce the filling amount of the lubricating oil (refrigeration oil) of the rotary compressor 1, the refrigerant content inside the rotary compressor 1 is reduced. Therefore, an improved oil reduction bottom cover design is proposed, which is applicable to the whole series of rotary compressors 1, and can reduce 55% of the oil volume between the cylinder 131 and the bottom cover 113 while maintaining the original performance (for example, if the new structure is used, assuming that the refrigerant of the housing 11 is R290, and the original oil filling amount is 140CC, it can be reduced to 60CC). It defines an oil storage area 10 formed between the second end surface 1312 of the cylinder 131 of the compressor 13 and the bottom cover 113 of the housing 11. The oil storage area 10 is for storing refrigeration oil, and the oil volume of the refrigeration oil in the oil storage area 10 is V. The inner diameter of the main shell 111 of the body 11 is M, the distance between the bottommost surface in the bottom cover 113 and the bottom surface of the cylinder body 131 of the compression pump 13 is H, and further explained, the bottommost surface in the bottom cover 113 is the inner bottom surface of the recessed area 11322 of the step portion 1132 of the bottom cover 113, and the bottom surface of the cylinder body 131 of the compression pump 13 is the second end surface 1312 of the cylinder body 131 of the compression pump 13, that is, the distance from the second end surface 1312 of the cylinder body 131 of the compression pump 13 to the inner bottom surface of the recessed area 11322 of the bottom cover 113; and when pi is set to π, and meets 25%

V/(π(M/2)2H)

40%. Under this condition, the space of the oil storage area 110 will be reduced, but the refrigeration oil level can still be maintained, reducing the mixing of refrigerant into the refrigeration oil, and the limited refrigerant amount can be brought into play to produce the maximum refrigeration room capacity, thereby effectively reducing the overall filling oil amount and refrigerant amount, improving energy efficiency, and there is no need to add foreign objects (such as mass blocks, gaskets, etc.) to the bottom cover 113, and effectively solving the problems faced by the previous technology. In addition, the design is in line with the trend of hydrocarbon refrigerants, has the characteristics of simplifying the assembly process, and helps the refrigerant to play the best role in the system. It should be noted that the structure of the new rotary compressor 1 is not only applicable to the rotary compressor 1 using R290 refrigerant, but also applicable to the rotary compressor 1 using other environmentally friendly refrigerants.

In view of the above, the present invention provides a rotary compressor 1, which reduces the oil filling of the compressor, reduces the amount of refrigerant dissolved in the oil, thereby effectively reducing the refrigerant filling amount, improving the safety of the operation of the combustible refrigerant compressor, and improving the performance of the rotary compressor 1.

However, the above is only an example of the implementation of this new model, and it cannot be used to limit the scope of the implementation of this new model. All simple equivalent changes and modifications made according to the scope of the patent application of this new model and the content of the patent specification are still within the scope of this new patent.

1: Rotary compressor

11: Shell

111: Main shell

112: Top cover

1121:Export pipe

113: Bottom cover

1131: Joint

11311: Bump

114:Fixer

12: Electric motor

121: Stator

122: Rotor

13: Compression pump

131: Cylinder body

1311: First end face

1312: Second end face

1316: Inlet

132: Ring

135: Upper support

136: Lower support

137: Crankshaft

1371: Eccentricity

1372: Upper shaft section

1373: Lower shaft section

14: Filter bottle

140: Storage space

141: Inlet pipe

142: Inner tube of filter bottle

15:Electrical connector assembly

Claims (9)

A rotary compressor, comprising: A casing, which is composed of a main shell, a top cover and a bottom cover; A motor disposed in the housing; A compression pump is disposed in the housing and located below the motor, and the compression pump includes; A cylinder body is formed with 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 cavity wall of the compression chamber. The spring hole is connected to the blade groove, and the suction hole is independent of the blade groove and the spring hole and is not connected to each other; A ring rotatably disposed in the compression chamber of the cylinder; A blade is reciprocatingly 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 disposed in each of the spring holes of the blade, so that the front end of the blade abuts against the outer peripheral surface of the ring; An upper support is disposed in the housing and located above the cylinder; A lower support is disposed in the housing and located below the cylinder; and A crankshaft is disposed in the housing, and the crankshaft is provided for the upper support, the motor, the ring and the lower support; An oil storage area is formed between the second end surface of the cylinder of the compression pump and the bottom cover of the housing, and the oil storage area is used to store 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 compression pump is H, and when pi is set to π, and 25% is satisfied

V/(π(M/2) ² H)

40%. As described in item 1 of the patent application scope, the bottom cover has a joint portion corresponding to the inner edge wall of the main shell, the joint portion is bent into a U-shaped structure; and a step portion, the step portion is a hollow structure. As described in item 2 of the patent application scope, the rotary compressor, wherein the outer ring of the joint portion of the bottom cover is provided with a plurality of protrusions, and when the joint portion of the bottom cover is arranged in the bottom end of the main shell, the bottom end of the main shell is connected to the protrusions. As described in item 3 of the patent application scope, the rotary compressor has three or more protrusions on the joint, and the protrusions are arranged at equal distances. The rotary compressor as described in item 4 of the patent application scope further includes a plurality of fixing members, which are respectively arranged at the positions where the protrusions of the joint portion of the bottom cover and the bottom end of the main shell are connected, so as to fix the bottom cover to the main shell. As described in item 5 of the patent application scope, the fixing member is a spot welding structure welded between each protrusion of the joint portion of the bottom cover and the bottom end of the main shell. As described in item 2 of the patent application scope, the step portion of the bottom cover is composed of an annular area and a recessed area, and the recessed area is located in the annular area and extends downward. As described in item 7 of the patent application scope, the recessed area is an annular structure and is arranged 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. The recessed area is a structure extending downward. The rotary compressor as described in claim 7, wherein the inner diameter of the annular region is M1, the inner diameter of the recessed region is M2, and the conditions 2 are met.

M1/M2

3.

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