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 present application relates to the field of compression mechanism, in particular to a rotary compressor. BACKGROUND

[0002] The existing rotary compressor mainly includes the following components: exhaust pipe, casing, motor (stator, rotor), crankshaft, upper bearing, muffler, compression unit (cylinder, ring, vane), lower bearing, bottom cover, outlet pipe, liquid accumulator 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, causing the ring to make eccentric motion in the cylinder, thereby compressing the low-temperature and low-pressure gas refrigerant medium into high-temperature and high-pressure gas, and then being discharged from the cylinder through the muffler to the casing. Then, through the cutting edge outside the stator and the gap between the rotors, it is discharged into the refrigeration cycle system through the outlet pipe.

[0003] In response to the issue of energy saving and carbon reduction, carbon-hydrogen refrigerants are receiving widespread attention in the industry. When carbon-hydrogen refrigerants are applied to refrigeration systems, there is an important technical challenge: carbon-hydrogen refrigerants have high flammability, which requires strict limits on the amount of refrigerant filled in the refrigeration system. Therefore, it is necessary to significantly reduce the amount of refrigerant in the compressor casing, thereby reducing the refrigerant filling amount of the entire refrigeration system. In a compressor with a traditional structure, in order to ensure the reliability of the operation of the compressor, it is necessary to fill enough lubricating oil to ensure the height of the oil level inside the compressor. However, since carbon-hydrogen refrigerants have good compatibility with lubricating oil, a high proportion of refrigerant will be contained in the lubricating oil, which may result in insufficient refrigerant during operation of the refrigeration system. Therefore, by reducing the amount of lubricating oil filled in the compressor, the content of refrigerant inside the compressor can be reduced, which not only reduces the refrigerant filling amount of the entire refrigeration system, but also ensures the safety and operating efficiency of the system.

[0004] However, in order to ensure the reliability of the operation of the existing rotary compressor, it is necessary to fill lubricating oil to maintain the height of the oil level inside the compressor. Since R290 refrigerant and lubricating oil have good compatibility, the more oil the compressor is filled with, the more R290 refrigerant will be dissolved in the refrigeration oil, which will have a certain impact on the performance of the compressor and cause a decrease in operating efficiency, which is still a problem that developers and researchers in the compressor and related industries must continue to overcome and solve. SUMMARY

[0005] Therefore, the main purpose of the present application is to provide a rotary compressor that reduces the oil filling amount of the compressor and reduces the amount of refrigerant dissolved in the oil, thereby effectively reducing the refrigerant filling amount and improving the safety of the operation of the flammable refrigerant compressor, to solve the problems existing in the prior art.

[0006] To achieve the foregoing object, the present application proposes a rotary compressor, comprising:

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

[0008] a motor arranged in the housing;

[0009] a compression pump arranged in the housing and located below the motor, the compression pump comprising:

[0010] a cylinder formed with a first end face and a second end face, the cylinder being provided with a compression cavity in the center, the cavity wall of the compression cavity being provided with a vane slot, a spring hole and a suction hole, the spring hole being communicated with the vane slot, and the suction hole being independent of the vane slot and the spring hole;

[0011] a ring rotatably arranged in the compression cavity of the cylinder;

[0012] a vane reciprocally arranged in the vane slot of the cylinder, the front end of the vane abutting against the outer circumferential surface of the ring;

[0013] at least one spring arranged in the spring hole of the vane so that the front end of the vane abuts against the outer circumferential surface of the ring;

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

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

[0016] a crankshaft arranged in the housing, the crankshaft being sleeved with the upper support, the motor, the ring and the lower support;

[0017] wherein the bottom cover is provided with a foot body which is integrally formed with the bottom cover, the foot body comprising an annular connecting plate and a plurality of support portions which are uniformly arranged on the outer side of the annular connecting plate, each of the support portions being provided with a support hole in the middle;

[0018] the second end face of the cylinder of the compression pump and the bottom cover of the housing form an oil storage area for storing refrigerant oil, the amount of the refrigerant oil in the oil storage area being V, the inner diameter of the main housing being M, the distance between the bottom surface of the cylinder of the compression pump and the bottom surface of the bottom cover of the housing being H, and when the circumference ratio is set as π, it is satisfied that 25%≤V / (π(M / 2)2H)≤40%.

[0019] Preferably, the bottom cover has a joint part corresponding to the inner edge wall of the main shell, the joint part is bent into an M-shaped structure, the joint part is connected with the annular connecting plate as a whole, when the joint part of the bottom cover is arranged in the bottom end of the main shell, the bottom end of the main shell is connected with the annular connecting plate; and a step part, the step part is a hollow structure.

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

[0021] Preferably, the edge between the two support parts has a downward turn.

[0022] Preferably, further comprising a plurality of fixing members arranged at positions where the annular connecting plate and the bottom end of the main shell are connected, so as to fix the bottom cover to the main shell.

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

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

[0025] Preferably, the recessed area is an annular structure arranged at the center of the annular area, the radial end of the recessed area is connected with the radial outer end of the annular area, and the recessed area extends downward.

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

[0027] Through the above structure, the application has the following beneficial effects: an improved oil-reducing bottom cover design is provided, which is suitable for a full series of rotary compressors, can reduce the oil amount between the cylinder and the bottom cover by 55% while maintaining the original performance, define an oil storage area between the second end face of the cylinder of the compression pump and the bottom cover of the shell, and provide a refrigeration oil storage area, the oil amount of the refrigeration oil in the oil storage area is V, the inner diameter of the main shell 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 the value of the circle constant is π, 25%≤V / (π(M / 2)2H)≤40% is satisfied; in this way, the overall oil filling amount and refrigerant amount can be effectively reduced, the energy efficiency can be improved, and the problems existing in the prior art can be effectively solved. In addition, the design conforms to the trend of hydrocarbon refrigerant, has the characteristics of simplifying the assembly process, and helps the refrigerant to play the best role in the system. BRIEF DESCRIPTION OF DRAWINGS

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

[0029] Figure 2 is a cross-sectional view of the rotary compressor of the applicationFigure 1 A partial sectional view.

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

[0031] Figure 4 This is a perspective view of the bottom cover of the rotary compressor of the present invention.

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

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

[0034] Symbol explanation:

[0035]

[0036] Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The shell 11 is a hollow body, which is composed of a main shell 111, a top cover 112 and a bottom cover 113. The shell 11 is used to accommodate the motor 12 and the compression pump 13. The shell 11 is provided with an outlet pipe 1121, which is arranged on the top cover 112 or the main shell 111. In the present embodiment, the outlet pipe 1121 is arranged on the top cover 112. The shell 11 can have any structure available on the market.

[0041] As described above, the bottom cover 113 is further described. The bottom cover 113 is provided with a foot body 1131, which is integrally formed with the bottom cover 113. The foot body 1131 includes an annular connecting plate 1132 and a plurality of support portions 1133. The support portions 1133 are arranged on the outer side of the annular connecting plate 1132 in a ring shape. Each of the support portions 1133 is provided with a support hole 11331, which is used to assemble a foot pad. The shape of the support portions 1133 is not limited. The number of the support portions 1133 is three or more. The support portions 1133 are arranged at equal distances. When the number of the support portions 1133 is three, the support portions 1133 are arranged in a triangle shape. The edge between the two support portions 1133 is provided with a downwardly bent edge 1134.

[0042] Further, the bottom cover 113 is provided with a joint portion 1135, which corresponds to the inner edge wall of the main shell 111. The joint portion 1135 is bent in an M shape. The joint portion 1135 is integrally connected with the annular connecting plate 1132. When the joint portion 1135 of the bottom cover 113 is arranged at the bottom end of the main shell 111, the bottom end of the main shell 111 is connected with the annular connecting plate 1132. The bottom cover 113 is further provided with a step portion 1136, which is connected with the joint portion 1135. The step portion 1136 is a hollow structure.

[0043] As described above, the bottom cover 113 is further provided with a plurality of fixing members 114, which are arranged at the position where the annular connecting plate 1132 is connected with the bottom end of the main shell 111. The fixing members 114 are used to fix the bottom cover 113 to the main shell 111. Further, the fixing members 114 are spot-welded structures, which are welded between the annular connecting plate 1132 and the bottom end of the main shell 111.

[0044] As mentioned above, the stepped portion 1136 of the bottom cover 113 is formed by an annular region 11361 and a recessed region 11362, and the recessed region 11362 is located in the annular region 11361 and extends downward. Further, the recessed region 11362 is annular, is arranged at the center of the annular region 11361, has a radial end connected to the radial outer end of the annular region 11361, and extends downward. The inner diameter of the annular region 11361 is M1, the inner diameter of the recessed region 11362 is M2, and 2≤M1 / M2≤3 is satisfied. The annular region 11361 and the recessed region 11362 are integrally formed.

[0045] The motor 12 is arranged in the housing 11. The motor 12 includes a stator 121 fixed to the inner wall of the main shell 111 of the housing 11, and a rotor 122 rotatably arranged inside the stator 121. The motor 12 can be any existing structure on the market, and its structure is not limited.

[0046] The compression pump 13 is disposed in the main shell 111 of the casing 11 and is located below the motor 12. The compression pump 13 includes a cylinder 131 disposed in the main shell 111 of the casing 11 and located below the motor 12. The cylinder 131 has a first end face 1311 and a second end face 1312. The cylinder 131 has a compression chamber 1313 extending through the upper and lower ends. The compression chamber 1313 has a vane slot 1314, a spring hole 1315 and a suction port 1316 formed in the wall of the compression chamber 1313. The spring hole 1315 does not extend completely through the wall of the compression chamber 1313. The spring hole 1315 is in communication with the vane slot 1314. The suction port 1316 is independent of the vane slot 1314 and the spring hole 1315. A ring 132 is rotatably disposed in the compression chamber 1313 of the cylinder 131. A vane 133 is reciprocally disposed in the vane slot 1314 of the cylinder 131. The front end of the vane 133 abuts the outer circumferential surface of the ring 132. The compression chamber 1313 is divided into a suction chamber and a compression chamber. At least one spring 134 is disposed in each spring hole 1315 of the vane slot 1314. The spring 134 is located at the rear end of the vane 133. The front end of the vane 133 abuts the outer circumferential surface of the ring 132. The rear end of the spring 134 abuts the inner wall of the main shell 111 of the casing 11. The spring 134 is extendable and retractable in the spring hole 1315. The front end of the vane 133 abuts the ring 132 eccentrically rotating in the compression chamber 1313 and performs reciprocating motion. An upper support 135 is disposed in the main shell 111 of the casing 11 and located above the cylinder 131. A lower support 136 is disposed in the main shell 111 of the casing 11 and located below the cylinder 131. A crankshaft 137 extends longitudinally for a proper length. The crankshaft 137 is disposed in the casing 11. The crankshaft 137 has at least one eccentric portion 1371 located at a proper distance from the lower end of the crankshaft 137. The crankshaft 137 defines an upper shaft segment 1372 and a lower shaft segment 1373. The upper shaft segment 1372 is sleeved with the upper support 135 and the rotor 122 of the motor 12. The lower shaft segment 1373 is sleeved with the lower support 136. Each eccentric portion 1371 is sleeved with the ring 132 of each cylinder 131. The crankshaft 137 is sleeved with the upper support 135, the motor 12, the ring 132 and the lower support 136. The compression pump 13 can have any existing structure.

[0047] 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.

[0048] 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, and the amount of refrigeration oil in the oil storage area 110 is V. The inner diameter of the main housing 111 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. The bottom surface of the cylinder 131 refers to the second end face 1312 of the cylinder 131. With pi set as π, and satisfying 25% ≤ V / (π(M / 2)2H) ≤ 40%, the overall filling oil and refrigerant amount of the rotary compressor 1 are reduced.

[0049] Based on the above structure, further explanation is provided below:

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 11362 of the step portion 1136 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 11362 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.

[0054] 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.

[0055] 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.

[0056] 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 bottom cover has a leg body on its outer ring. The leg body and the bottom cover are integrally formed. The leg body includes an annular connecting plate and multiple support parts. The support parts are evenly arranged in a ring on the outer side of the annular connecting plate. Each support part has a support hole in the middle. The second end face of the cylinder of the compressor pump forms an oil storage area between the bottom cover of the housing and the 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 pi as π, it satisfies 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 is bent into a U-shape and is connected to the annular connecting plate as a whole. When the joint portion 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 annular connecting plate; and a step portion, which is a hollow structure.

3. The rotary compressor as described in claim 1, characterized in that, The number of the support parts is three or more, and these support parts are arranged at equal intervals.

4. The rotary compressor as described in claim 1, characterized in that, The edge between the two supports has a downward-facing flange.

5. The rotary compressor as described in claim 2, characterized in that, Furthermore, it includes multiple fasteners, which are respectively located at the connection 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 as described in claim 5, characterized in that, The fastener is a spot-welded structure that is welded between the annular connecting plate 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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