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] The utility model relates to the field of compressor structures, in particular to a rotary compressor. Background Art

[0002] An existing rotary compressor primarily consists of the following components: an exhaust pipe, a casing, an electric motor (stator and rotor), a crankshaft, an upper bearing, a muffler, a compression unit (cylinder, rings, and blades), a lower bearing, a bottom cover, an outlet pipe, a liquid reservoir, and an inlet pipe. The basic operating principle of a compressor is as follows: When the compressor is powered on, the stator generates a magnetic field, rotating the rotor, which in turn drives the crankshaft, causing the rings to move eccentrically within the cylinder. This compresses the low-temperature, low-pressure gas refrigerant into a high-temperature, high-pressure gas, which is then discharged from the cylinder through the muffler into the casing. The gas then passes through the trimmed edges of the stator and the gap between the rotors before being discharged through the outlet pipe into the refrigeration cycle.

[0003] In response to energy conservation and carbon reduction initiatives, hydrocarbon refrigerants are gaining widespread attention in the industry. Their use in refrigeration systems presents a significant technical challenge: their high flammability requires strict limits on the refrigerant volume within the refrigeration system. Therefore, the amount of refrigerant within the compressor housing must be significantly reduced, thereby reducing the refrigerant volume within the entire refrigeration system. Traditional compressors require sufficient lubricant oil to maintain a high oil level within the compressor to ensure reliable operation. However, due to the high compatibility between hydrocarbon refrigerants and lubricants, the lubricant contains a high proportion of refrigerant, which can lead to refrigerant shortages during refrigeration system operation. Therefore, reducing the amount of lubricant oil in the compressor, and thereby the refrigerant content within the compressor, is an effective solution to this problem. This approach not only reduces the refrigerant volume within the entire refrigeration system but also ensures system safety and operational efficiency.

[0004] However, to ensure reliable operation, current rotary compressors require lubricant filling to maintain the oil level inside the compressor. Due to the excellent compatibility between R290 refrigerant and lubricant, increasing the amount of oil in the compressor means more R290 dissolves in the oil. This can negatively impact compressor performance and lead to reduced efficiency, presenting a challenge that developers and researchers in the compressor and related industries must continually address. Utility Model Content

[0005] Therefore, the main purpose of the present invention is to provide a rotary compressor, reduce the oil filling amount of the compressor, reduce the amount of refrigerant dissolved in the oil, thereby effectively reducing the refrigerant charge amount, and improve the safety of the operation of the flammable refrigerant compressor to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides a rotary compressor, comprising:

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

[0008] an electric motor disposed in the housing;

[0009] A compression pump is disposed in the housing and below the motor, the compression pump comprising:

[0010] A cylinder body is formed with a first end face and a second end face, a compression chamber is provided in the center of the cylinder body, a vane groove, a spring hole and a suction hole are provided on the cavity wall of the compression chamber, the spring hole is communicated with the vane groove, and the suction hole is independent of the vane groove and the spring hole and is not communicated with each other;

[0011] a ring rotatably disposed in the compression chamber of the cylinder;

[0012] a blade reciprocatingly disposed in the blade groove of the cylinder body, wherein 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, so that the front end of the blade abuts against the outer peripheral surface of the ring;

[0014] an upper support disposed in the housing and located above the cylinder;

[0015] a lower support disposed in the housing and located below the cylinder; and

[0016] a crankshaft disposed in the housing, the crankshaft being provided for the upper support, the motor, the ring, and the lower support to be mounted thereon;

[0017] The outer ring of the bottom cover is provided with a tripod body, which is an integrally formed structure with the bottom cover. The tripod body includes an annular connecting plate and a plurality of supporting parts, which are evenly arranged in an annular shape on the outer side of the annular connecting plate. A supporting hole is provided in the middle of each supporting part.

[0018] An oil storage area is formed between the second end face of the cylinder body of the compression pump and the bottom cover of the shell, and the oil storage area is for storing refrigeration oil. The amount of refrigeration oil in the oil storage area is V, the inner diameter of the main shell is M, the distance between the bottommost surface inside the bottom cover and the bottom surface of the cylinder body of the compression pump is H, and when pi is set to π, it satisfies 25%≤V / (π(M / 2)2H)≤40%.

[0019] 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, the joint portion is connected to the annular connecting plate as a whole, 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 annular connecting plate; and a step portion, which is a hollow structure.

[0020] Preferably, the number of the supporting portions is three or more, and the supporting portions are arranged at equal distances.

[0021] Preferably, the edge between the two supporting parts has a downward flange.

[0022] Preferably, it further includes a plurality of fixing members, which are respectively arranged at the connection position between the annular connecting plate and the bottom end of the main shell to fix the bottom cover to the main shell.

[0023] Preferably, the fixing member is a spot welding structure so as to be welded between the annular connecting plate and the bottom end of the main shell.

[0024] Preferably, the step portion of the bottom cover consists of an annular area and a recessed area, and the recessed area is located in the annular area and extends downward.

[0025] Preferably, 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.

[0026] Preferably, the inner diameter of the annular area is M1, the inner diameter of the recessed area is M2, and they satisfy 2≤M1 / M2≤3.

[0027] The above structure shows that the beneficial effects of the present invention are as follows: an improved oil-reducing bottom cover design is proposed, which is applicable to the entire series of rotary compressors. It can reduce the oil volume between the cylinder body and the bottom cover by 55% while maintaining the original performance. An oil storage area is formed between the second end face of the cylinder body of the compression pump and the bottom cover of the shell. 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 shell is M, the spacing value between the bottom surface inside the bottom cover and the bottom surface of the cylinder body of the compression pump is H, and when pi is set to π, it satisfies 25%≤V / (π(M / 2)2H)≤40%; in this way, the overall filling oil volume and refrigerant volume can be effectively reduced, energy efficiency can be improved, and the problems faced by the existing technology can be effectively solved. In addition, the 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the rotary compressor of the present invention.

[0029] Figure 2For this utility model Figure 1 A partial cross-sectional view of .

[0030] Figure 3 This is a cross-sectional view of the compression pump of the rotary compressor of the present invention.

[0031] Figure 4 It is a three-dimensional diagram of the bottom cover of the rotary compressor of the present invention.

[0032] Figure 5 It is a top view of the bottom cover of the rotary compressor of the present invention.

[0033] Figure 6 It is a cross-sectional view of the bottom cover of the rotary compressor of the present invention.

[0034] Explanation of symbols:

[0035]

[0036] DETAILED DESCRIPTION

[0037] To understand the features, contents, advantages, and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and in the form of embodiments. The drawings used therein are for illustration and auxiliary purposes only and may not reflect the actual proportions and precise configurations of the present invention after implementation. Therefore, the proportions and configurations of the attached drawings should not be interpreted to limit the scope of the present invention in actual implementation.

[0038] The advantages, features, and technical methods achieved by the present invention will be described in more detail with reference to exemplary embodiments and the accompanying drawings so that they are easier to understand. The present invention may be implemented in different forms and should not be understood as being limited to the embodiments described herein. 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 be defined only by the appended claims.

[0039] First, see Figures 1 to 6 , is a rotary compressor of the present invention. The rotary compressor 1 includes: a housing 11, an electric motor 12 and a compression pump 13. The rotary compressor 1 of the present invention is a vertical compressor type.

[0040] The shell 11 is a hollow body as a whole, and is composed of a main shell 111, a top cover 112 and a bottom cover 113. The shell 11 is used to accommodate components such as the motor 12 and the compression pump 13. An outlet pipe 1121 is provided on the shell 11, and the outlet pipe 1121 is set at any position of the top cover 112 or the main shell 111. In this figure, the outlet pipe 1121 is shown to be set at the top cover 112; wherein, the shell 11 can be various existing structural types on the market, and its structural type is not limited.

[0041] As mentioned above, the structure of the bottom cover 113 is further explained. A tripod body 1131 is provided on the outer ring of the bottom cover 113. The tripod body 1131 and the bottom cover 113 are an integrally formed structure. The tripod body 1131 includes an annular connecting plate 1132 and a plurality of support portions 1133. The support portions 1133 are evenly arranged in a ring shape on the outer side of the annular connecting plate 1132. A support hole 11331 is provided in the middle of each support portion 1133. The support holes 11331 are for assembling the foot pad. The shape of the support portion 1133 is not limited. The number of the support portions 1133 is three or more, and the support portions 1133 are arranged at equal distances. If the number of the support portions 1133 is three, they are arranged in an equilateral triangle; and the edge between the two support portions 1133 has a downward flange 1134.

[0042] Furthermore, the bottom cover 113 has a joint portion 1135, which corresponds to the inner edge wall of the main shell 111, and the joint portion 1135 is bent into a U-shaped structure. The joint portion 1135 is connected to the annular connecting plate 1132 as a whole. When the joint portion 1135 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 annular connecting plate 1132; and a step portion 1136, which is connected to the joint portion 1135 and has a hollow structure.

[0043] As mentioned above, a plurality of fixing members 114 are further included. These fixing members 114 are respectively disposed at the connection position between the annular connecting plate 1132 and the bottom end of the main shell 111, and are used to fix the bottom cover 113 to the main shell 111. Furthermore, the fixing members 114 are spot-welded structures and are welded between the annular connecting plate 1132 and the bottom end of the main shell 111.

[0044] As previously mentioned, the stepped portion 1136 of the bottom cover 113 consists of an annular area 11361 and a recessed area 11362. The recessed area 11362 is located within the annular area 11361 and extends downward. Furthermore, the recessed area 11362 is an annular structure, located at the center of the annular area 11361. The radial end of the recessed area 11362 connects to the radial outer end of the annular area 11361, and the recessed area 11362 extends downward. The inner diameter of the annular area 11361 is M1, and the inner diameter of the recessed area 11362 is M2, satisfying 2≤M1 / M2≤3. The annular area 11361 and the recessed area 11362 are integrally formed.

[0045] The motor 12 is disposed within the housing 11 and includes a stator 121 fixed to the inner wall of the main shell 111 of the housing 11; and a rotor 122 rotatably disposed on the inner side of the stator 121. The motor 12 can be of various existing structural types on the market and is not limited to its structural type.

[0046] The compression pump 13 is arranged in the main shell 111 of the housing 11. The compression pump 13 is located below the motor 12. The compression pump 13 includes a cylinder 131. The cylinder 131 is arranged in the main shell 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. The center of the cylinder 131 is provided with a compression chamber 1313 that passes through the upper and lower ends. The cavity wall of the compression chamber 1313 is provided with a blade groove 1314, a spring hole 1315 and a suction port 1316. The spring hole 1315 does not completely pass through the cavity wall of the compression chamber 1313. The spring hole 1315 and the suction port 1316 are provided. The blade groove 1314 is connected, and the suction port 1316 is independent of the blade groove 1314 and the spring hole 1315 and is not connected to each other; a ring 132, the ring 132 is rotatably arranged in the compression chamber 1313 of the cylinder body 131; a blade 133, the blade 133 is reciprocally arranged 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 arranged in each of the spring holes 1315 of the blade groove 1314, and the spring 134 is located at the rear end of the blade 133, so that the front end of the blade 133 The outer peripheral surface of the ring 132 is in contact with the rear end of the spring 134 and the inner wall of the main shell 111 of the housing 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 ring 132 rotating eccentrically in the compression chamber 1313 and reciprocates; an upper support 135, which is arranged in the main shell 111 of the housing 11 and is located above the cylinder body 131; a lower support 136, which is arranged in the main shell 111 of the housing 11 and is located below the cylinder body 131; and a crankshaft 137, which is formed by extending an appropriate length in the longitudinal direction and is arranged in 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, 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 mounted, and the lower shaft section 1373 is provided for the lower support 136 to be mounted, and each eccentric portion 1371 is provided for the ring 132 of each cylinder body 131 to be mounted; therefore, the crankshaft 137 is provided for the upper support 135, the motor 12, the ring 132 and the lower support 136 to be mounted; wherein, the compression pump 13 can be various existing structural types on the market, and its structural type is not limited.

[0047] It is worth mentioning that there is no limit to the number of cylinders 131 and rings 132; that is, the compression pump 13 can be a single-cylinder, double-cylinder, or three or more cylinders, and the cylinder 131 and the rings 132 can be correspondingly set to one, two, or more than three. The number of the rings 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.

[0048] To further explain, an oil storage area 110 is formed between the second end surface 1312 of the cylinder body 131 of the compression pump 13 and the bottom cover 113 of the shell 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 shell 111 is M, and the distance between the bottom surface inside the bottom cover 113 and the bottom surface of the cylinder body 131 of the compression pump 13 is H. The bottom surface of the cylinder body 131 refers to the second end surface 1312 of the cylinder body 131, and when the pi is set to π, and 25%≤V / (π(M / 2)2H)≤40% is satisfied, the overall oil filling amount and refrigerant amount of the rotary compressor 1 are reduced.

[0049] Based on the above structure, the following is further explained:

[0050] 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 an appropriate length in the longitudinal direction, and its interior defines a accommodating space 140. 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. The filter bottle inner tube 142 extends to the outside of the filter bottle 14 and extends into the shell 11, and is 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 shell 11, and the low-pressure gas (refrigerant) in the filter bottle 14 is transferred to the suction port 1316 of the cylinder 131 of the compression pump 13 through the filter bottle inner tube 142, and then transferred to the compression chamber 1313 for continuous compression to a certain pressure, and then output to the space in the shell 11.

[0051] To further illustrate, 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 shell 11 of the rotary compressor 1 to form a refrigeration cycle 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 type of compression pump 13 such as single cylinder, double cylinder or three cylinders or above; wherein, the filter bottle 14 can be various existing structural types on the market, and its structural type is not limited.

[0052] In this embodiment, the rotary compressor 1 further includes an electrical connector assembly 15, which is disposed on the main shell 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.

[0053] Under this structure, when the rotor 122 of the motor 12 rotates, it drives the crankshaft 137 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 utilizes the upper shaft section 1372 and the lower shaft section 1373 of the crankshaft 137 to support the upper support 135 and the lower support 136 and perform high-speed operation, so that the compression pump 13 as a whole is in an operating state, so that the gas refrigerant is sucked into the compression chamber 1313 inside the cylinder body 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, thereby reducing the refrigerant content inside the rotary compressor 1. Therefore, an improved oil-reducing bottom cover design is proposed, which is applicable to the entire series of rotary compressors 1. It can reduce 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 the present invention is used, assuming that the refrigerant of the housing 11 is R290, and the original oil filling volume is 140CC, it can be reduced to 60CC). An oil storage area 10 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. The oil storage area 10 is for storing refrigeration oil, and the amount of refrigeration oil in the oil storage area 10 is V. The main shell 11 of the housing 11 1 has an inner diameter of M, and a spacing value between the bottommost surface inside the bottom cover 113 and the bottom surface of the cylinder body 131 of the compression pump 13 is H. To further explain, the bottommost surface inside the bottom cover 113 is the bottom surface inside the recessed area 11362 of the step portion 1136 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 spacing from the second end surface 1312 of the cylinder body 131 of the compression pump 13 to the bottom surface inside the recessed area 11362 of the bottom cover 113; and when pi is set to π, it satisfies 25%≤V / (π(M / 2)2H)≤40%. Under these constraints, the space within oil storage area 110 is reduced, while still maintaining the refrigeration oil level and reducing the mixing of refrigerant into the refrigeration oil. This maximizes the cooling capacity of the limited refrigerant, effectively reducing the overall oil and refrigerant volume, improving energy efficiency, and eliminating the need for external objects (such as masses or spacers) within bottom cover 113. This effectively addresses the challenges faced by existing technologies. Furthermore, this design aligns with the trend toward hydrocarbon refrigerants, simplifies the assembly process, and helps optimize the refrigerant's performance within the system.

[0054] It should be noted that the structure of the rotary compressor 1 of the present invention is not only applicable to the rotary compressor 1 using the R290 refrigerant, but is also applicable to the rotary compressor 1 using other environmentally friendly refrigerants.

[0055] In view of the above, the present invention provides a rotary compressor 1, which reduces the oil filling of the compressor and reduces the amount of refrigerant dissolved in the oil, thereby effectively reducing the refrigerant filling amount, improving the safety of the operation of the flammable refrigerant compressor, and enhancing the performance of the rotary compressor 1.

[0056] The above description is merely an embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the claims and the contents of the patent specification of the present invention are still within the scope of the present invention patent.

Claims

1. A rotary compressor, characterized in that: include: a housing, consisting of a main shell, a top cover and a bottom cover; an electric motor disposed in the housing; A compression pump is disposed in the housing and below the motor, the compression pump comprising: A cylinder body is formed with a first end face and a second end face, a compression chamber is provided in the center of the cylinder body, a vane groove, a spring hole and a suction hole are provided on the cavity wall of the compression chamber, the spring hole is communicated with the vane groove, and the suction hole is independent of the vane groove and the spring hole and is not communicated with each other; a ring rotatably disposed in the compression chamber of the cylinder; a blade reciprocatingly disposed in the blade groove of the cylinder body, wherein 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, so that the front end of the blade abuts against the outer peripheral surface of the ring; an upper support disposed in the housing and located above the cylinder; a lower support disposed in the housing and located below the cylinder; and a crankshaft disposed in the housing, the crankshaft being provided for the upper support, the motor, the ring, and the lower support to be mounted thereon; The outer ring of the bottom cover is provided with a tripod body, which is an integrally formed structure with the bottom cover. The tripod body includes an annular connecting plate and a plurality of supporting parts, which are evenly arranged in an annular shape on the outer side of the annular connecting plate. A supporting hole is provided in the middle of each supporting part. An oil storage area is formed between the second end face of the cylinder body of the compression pump and the bottom cover of the shell, and the oil storage area is for storing refrigeration oil. The amount of refrigeration oil in the oil storage area is V, the inner diameter of the main shell is M, the distance between the bottommost surface inside the bottom cover and the bottom surface of the cylinder body of the compression pump is H, and when pi is set to π, it satisfies 25%≤V / (π(M / 2)2H)≤40%.

2. The rotary compressor according to claim 1, wherein 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 the joint portion is connected to the annular connecting plate as a whole. 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 annular connecting plate; and a step portion, which is a hollow structure.

3. The rotary compressor according to claim 1, wherein The number of the supporting parts is three or more, and the supporting parts are arranged at equal distances.

4. The rotary compressor according to claim 1, wherein The edge between the two supporting parts has a downward flange.

5. The rotary compressor according to claim 2, wherein: It further includes a plurality of fixing members, which are respectively arranged at the connection position between the annular connecting plate and the bottom end of the main shell to fix the bottom cover to the main shell.

6. The rotary compressor according to claim 5, wherein: The fixing piece is a spot welding structure so as to be welded between the annular connecting plate and the bottom end of the main shell.

7. The rotary compressor according to claim 2, wherein: The step portion of the bottom cover consists of an annular area and a recessed area. The recessed area is located in the annular area and extends downward.

8. The rotary compressor according to claim 7, wherein: 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.

9. The rotary compressor according to claim 7, wherein: The inner diameter of the annular area is M1, the inner diameter of the recessed area is M2, and they satisfy 2≤M1 / M2≤3.

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