Rotary compressor and refrigeration equipment

Abstract

The utility model discloses a rotary compressor and refrigeration equipment, and the rotary compressor comprises a motor which comprises a stator and a rotor; the pump body component comprises a crankshaft, a first bearing, an air cylinder and a second bearing, one end of the crankshaft is connected with the rotor, the other end of the crankshaft sequentially penetrates through the first bearing, the air cylinder and the second bearing and is connected with an eccentric part in the air cylinder, and the air cylinder is provided with an air suction hole opened outwards in the radial direction and a communicating hole communicating with the air suction hole; the pump body component is further provided with a buffer groove which is communicated with the air suction hole through a communicating hole. Wherein the included angle between the central axis of the air suction hole and the end face of the air cylinder is alpha, the total volume of the buffer groove is Vc, the displacement of the rotary compressor is Ve, and alpha is larger than or equal to 45 degrees and smaller than or equal to 90 degrees. And the efficiency of the rotary compressor can be effectively improved by reasonably setting the volume of the buffer groove.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a rotary compressor and a refrigeration device with the rotary compressor. Background Art

[0002] In recent years, the requirements for energy conservation and environmental protection in the air-conditioning industry have been continuously increasing. As the core component in the air-conditioning system, the compressor can achieve the goal of energy conservation by improving the efficiency of the compressor. Improving the volumetric efficiency of the compressor is an effective means to improve the energy efficiency of the compressor, and the suction volume of the compressor has a great influence on the volumetric efficiency of the compressor.

[0003] The working principle of the existing air-conditioning system is as follows: The low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator will enter the cylinder suction hole through the compressor liquid receiver. The refrigerant is compressed into a high-temperature and high-pressure refrigerant in the cylinder, discharged through the exhaust port and enters the condenser. After exchanging heat with the environment in the condenser, it becomes a low-temperature and low-pressure liquid refrigerant through the throttle valve and enters the evaporator. The evaporator absorbs heat to make the refrigerant become a low-temperature and low-pressure gaseous refrigerant and then enters the compressor, so as to circulate.

[0004] When the compressor finishes suction, there will be a situation of suction reflux. In the prior art, part of the gas with suction reflux will enter the liquid receiver from the cylinder. This process has a long flow path and large gas loss, which affects the suction volume of the compressor, and further affects the energy efficiency of the compressor. On the other hand, the suction reflux will increase the pressure pulsation, and further cause the deterioration of noise, and there is room for improvement. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a rotary compressor, which can realize the compression function, improve the reliability of gas compression, increase the suction volume of the rotary compressor, reduce noise, and effectively improve the efficiency of the rotary compressor by reasonably setting the volume of the buffer tank.

[0006] The rotary compressor according to the embodiment of the utility model includes: a motor, the motor includes a stator and a rotor; a pump body component, the pump body component includes a crankshaft, a first bearing, a cylinder and a second bearing. One end of the crankshaft is connected to the rotor, and the other end of the crankshaft sequentially passes through the first bearing, the cylinder and the second bearing and is connected to an eccentric member in the cylinder. The cylinder is provided with a suction hole opening radially outward and a communication hole communicating with the suction hole, and the pump body component is also provided with a buffer tank, and the buffer tank is communicated with the suction hole through the communication hole; wherein, the included angle between the central axis of the communication hole and the end face of the cylinder is α, the total volume of the buffer tank is Vc, the displacement of the rotary compressor is Ve, and it satisfies: 45° ≤ α ≤ 90°.

[0007] According to the rotary compressor of the embodiments of the present utility model, a motor can be provided to supply driving force to the crankshaft, so that the crankshaft can drive the eccentric part to move to compress gas, realizing the compression function of the rotary compressor. At the same time, a first bearing and a second bearing are sleeved outside the crankshaft, and the cylinder can be sealed through the first bearing and the second bearing, improving the reliability of gas compression, and the crankshaft can be supported through the first bearing and the second bearing to reduce the vibration of the crankshaft. Moreover, by providing a buffer groove, the air intake volume of the rotary compressor can be increased, the noise can be reduced, and the efficiency of the rotary compressor can be effectively improved by reasonably setting the volume of the buffer groove.

[0008] According to the rotary compressor of some embodiments of the present utility model, the diameter of the communication hole is d, and it satisfies: 1mm ≤ d ≤ 4mm.

[0009] According to the rotary compressor of some embodiments of the present utility model, it satisfies: 45° ≤ α ≤ 70°.

[0010] According to the rotary compressor of some embodiments of the present utility model, the communication hole communicates with one side of the air intake hole close to the first bearing.

[0011] According to the rotary compressor of some embodiments of the present utility model, the buffer groove is arranged on the end face of the cylinder close to the first bearing; or, the end face of the cylinder and the end face of the first bearing jointly define the buffer groove.

[0012] According to the rotary compressor of some embodiments of the present utility model, the communication hole communicates with one side of the air intake hole close to the second bearing.

[0013] According to the rotary compressor of some embodiments of the present utility model, the buffer groove is arranged on the end face of the cylinder close to the second bearing; or, the end face of the cylinder and the end face of the second bearing jointly define the buffer groove.

[0014] According to the rotary compressor of some embodiments of the present utility model, there are a plurality of buffer grooves, and adjacent two buffer grooves are communicated, and one of the plurality of buffer grooves is connected to the communication hole.

[0015] According to the rotary compressor of some embodiments of the present utility model, the total volume Vc of the buffer grooves is the sum of the volumes of the plurality of buffer grooves; wherein, the volume of a single buffer groove is the product of the area S enclosed by the contour of the buffer groove and the depth H of the buffer groove.

[0016] The rotary compressor according to some embodiments of the present invention, the number of poles of the rotor is P, and it satisfies: 10 ≤ P ≤ 12; and / or, the number of slots of the motor is Q, and it satisfies: 15 ≤ Q ≤ 18.

[0017] The rotary compressor according to some embodiments of the present invention, the number of phases of the motor is m, and it satisfies:

[0018] The rotary compressor according to some embodiments of the present invention, there is at least one cylinder, and the ratio of the number of poles of the rotor to the number of cylinders is greater than or equal to 10.

[0019] The present invention also provides a refrigeration device.

[0020] The refrigeration device according to the embodiment of the present invention is provided with the rotary compressor described in any one of the above.

[0021] The advantages of the refrigeration device and the above-mentioned rotary compressor over the prior art are the same, and will not be elaborated here.

[0022] The additional aspects and advantages of the present invention will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of a rotary compressor according to an embodiment of the present invention;

[0025] Figure 2 is a partial schematic diagram of a rotary compressor according to an embodiment of the present invention Figure 1 ;

[0026] Figure 3 is a partial schematic diagram of a rotary compressor according to an embodiment of the present invention Figure 2 ;

[0027] Figure 4 is a partial schematic diagram of a rotary compressor according to an embodiment of the present invention Figure 3 ;

[0028] Figure 5 is a schematic structural diagram of a cylinder according to an embodiment of the present invention Figure 1 ;

[0029] Figure 6 is a schematic structural diagram of a cylinder according to an embodiment of the present invention Figure 2 ;

[0030] Figure 7 is a schematic structure diagram of a cylinder according to an embodiment of the present utility model Figure 3 ;

[0031] Figure 8 is a trend chart of the energy efficiency ratio of a rotary compressor according to an embodiment of the present utility model at different rotational speeds.

[0032] Reference numerals:

[0033] Rotary compressor 100,

[0034] Motor 1, stator 11, stator core 111, stator winding 112, rotor 12, pump body component 2, crankshaft 21, first bearing 22, first radial part 221, first axial part 222, cylinder 23, suction hole 231, communication hole 232, second bearing 24, second radial part 241, second axial part 242, eccentric member 25, buffer groove 26, liquid storage tank 3, housing 4, connecting member 5. Detailed implementation manners

[0035] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Reference will be made below Figures 1 - 8 to describe the rotary compressor 100 according to an embodiment of the present utility model. By providing the motor 1, a driving force can be provided for the crankshaft 21, so that the crankshaft 21 can drive the eccentric member 25 to move to compress the gas, realizing the compression function of the rotary compressor 100. At the same time, a first bearing 22 and a second bearing 24 are sleeved outside the crankshaft 21, which can improve the reliability of compressing the gas through the first bearing 22 and the second bearing 24, and can reduce the vibration of the crankshaft 21. In addition, by providing the buffer groove 26, the suction volume of the rotary compressor 100 can be increased, the noise can be reduced, and the efficiency of the rotary compressor 100 can be effectively improved by reasonably setting the volume of the buffer groove 26.

[0039] As Figures 1 - 8 shown, the rotary compressor 100 according to an embodiment of the present utility model includes: a motor 1 and a pump body component 2.

[0040] Among them, the motor 1 is the power source of the rotary compressor 100, mainly playing a driving role, converting electrical energy into mechanical energy to provide a driving force for the components inside the rotary compressor 100. The motor 1 includes a stator 11 and a rotor 12. When the motor 1 is powered on, the stator 11 can generate an electromagnetic force to drive the rotor 12 to rotate, that is, electrical energy can be converted into mechanical energy to realize the driving function of the motor 1.

[0041] In the embodiment as Figure 1 shown, the rotor 12 is installed inside the stator 11, which can make the distance between the stator 11 and the rotor 12 relatively close, facilitating the stator 11 to drive the rotor 12 to rotate, and can improve the reliability of the stator 11 driving the rotor 12 to rotate. At the same time, the stator 11 includes a stator core 111 and a stator winding 112. The stator core 111 can be used to provide a setting position for the stator winding 112. When the motor 1 is powered on, the stator winding 112 and the stator core 111 can jointly generate an electromagnetic force and drive the rotor 12 to rotate.

[0042] The pump body component 2 includes a crankshaft 21, a first bearing 22, a cylinder 23, and a second bearing 24. One end of the crankshaft 21 is connected to the rotor 12. The other end of the crankshaft 21 sequentially passes through the first bearing 22, the cylinder 23, and the second bearing 24 and is connected to an eccentric member 25 inside the cylinder 23. The cylinder 23 is provided with a suction hole 231 that opens radially outward and a communication hole 232 that communicates with the suction hole 231. The pump body component 2 is further provided with a buffer groove 26, and the buffer groove 26 communicates with the suction hole 231 through the communication hole 232. Wherein, the included angle between the central axis of the communication hole 232 and the end face of the cylinder 23 is α, the total volume of the buffer groove 26 is Vc, and the displacement of the rotary compressor 100 is Ve, and it satisfies: 45° ≤ α ≤ 90°,

[0043] Specifically, the crankshaft 21 is used to transmit power. Connecting one end of the crankshaft 21 to the rotor 12 enables the crankshaft 21 to rotate under the drive of the rotor 12 and transmit the driving force on the rotor 12 to other components. At the same time, passing the other end of the crankshaft 21 sequentially through the first bearing 22, the cylinder 23, and the second bearing 24 can arrange the first bearing 22, the cylinder 23, and the second bearing 24 in sequence in the up-down direction. The crankshaft 21 can be supported by the first bearing 22 and the second bearing 24, reducing the vibration of the crankshaft 21, thereby reducing the wear between the crankshaft 21 and the first bearing 22 and the second bearing 24, and can seal the cylinder 23 from above and below the cylinder 23 through the first bearing 22 and the second bearing 24 respectively, improving the reliability of gas compression.

[0044] Moreover, the crankshaft 21 can penetrate the cylinder 23 and be connected to the eccentric member 25 inside the cylinder 23, and the crankshaft 21 can rotate relative to the cylinder 23, that is, the eccentric member 25 can rotate under the drive of the crankshaft 21. Thus, the crankshaft 21 can connect the rotor 12 and the eccentric member 25, enabling the crankshaft 21 to transmit the driving force on the rotor 12 to the eccentric member 25. Further, the eccentric member 25 can rotate relative to the cylinder 23 and compress the gas inside the cylinder 23 during the rotation process, realizing the compression function of the rotary compressor 100. Wherein, the eccentric member 25 is eccentrically arranged with the crankshaft 21, and the eccentric member 25 can be a piston.

[0045] Meanwhile, an air inlet hole 231 that opens radially outward is provided on the cylinder 23, and the cylinder 23 communicates with the liquid storage tank 3. Even when the rotary compressor 100 sucks air, the refrigerant in the liquid storage tank 3 can enter the inside of the cylinder 23 through the air inlet hole 231. Moreover, the pump body component 2 includes a buffer tank 26 that can be used to store gas. A communication hole 232 that communicates with the air inlet hole 231 is also provided on the cylinder 23. The communication hole 232 is used to connect the air inlet hole 231 with the buffer tank 26. Thus, when the air suction of the rotary compressor 100 ends, the gas in the cylinder 23 flowing into the liquid storage tank 3 due to air suction backflow can be reduced. That is, this part of the gas can enter the buffer tank 26 from the air inlet hole 231 through the communication hole 232, thereby shortening the gas flow path, reducing the gas flow loss, and then improving the air suction efficiency of the rotary compressor 100, increasing the air suction volume, and enhancing the efficiency of the rotary compressor 100. Moreover, shortening the gas flow path helps to reduce turbulence, that is, it can reduce the pressure pulsation, and then reduce the noise, which is beneficial to improving user satisfaction.

[0046] And, as Figure 2 shown, the included angle between the central axis of the communication hole 232 and the end face of the cylinder 23 is α. Herein, the end face can be the upper end face or the lower end face, that is, the buffer tank 26 can be arranged on the upper side or the lower side of the air inlet hole 231, and α is made to be between 45° and 90°. Thus, the communication hole 232 can be inclined relative to the end face of the cylinder 23, and the communication hole 232 can be inclined toward the center of the cylinder 23 to facilitate the gas entering the communication hole 232 from the air inlet hole 231 during the backflow process. Moreover, the total volume of the buffer tank 26 is Vc, and the displacement of the rotary compressor 100 is Ve. Herein, the size of Vc determines the amount of gas that the buffer tank 26 can store, and the size of Ve determines the compression capacity of the rotary compressor 100. When Vc / Ve is too large, that is, the volume of the buffer tank 26 is larger, which means the occupied space of the buffer tank 26 on the cylinder 23 is larger, resulting in a reduction in the structural strength of the cylinder 23. When Vc / Ve is too small, that is, the volume of the buffer tank 26 is smaller, reducing the gas stored in the buffer tank 26, which is not conducive to increasing the air suction volume of the rotary compressor 100. It can make Vc / Ve be between 0.1 and 0.4. At this time, the air suction volume of the rotary compressor 100 can be increased on the premise of ensuring the structural strength of the cylinder 23, which is beneficial to enhancing the efficiency of the rotary compressor 100.

[0047] Further, Vc / Ve can be set to 0.1, 0.2, 0.3, 0.4, etc., so as to increase the suction volume while ensuring the structural strength of the cylinder 23. That is, by reasonably setting the volume of the buffer groove 26, the suction volume of the rotary compressor 100 can be effectively increased, and thus the efficiency of the rotary compressor 100 can be effectively improved. Moreover, the designer can flexibly set the volume of the buffer groove 26 according to actual needs to maximize the efficiency of the rotary compressor 100.

[0048] Among them, it should be noted that, as Figure 8 shown are the COP trend lines of the rotary compressor 100 when the rotational speeds of the rotor 12 are 30 rpm and 90 rpm respectively. Among them, COP (Coefficient of Performance) represents the energy efficiency ratio of the rotary compressor 100. It can be seen that as Vc / Ve gradually increases, the efficiency of the rotary compressor 100 gradually increases. However, when the ratio is greater than 0.4, the efficiency of the rotary compressor 100 at low frequencies tends to be flat and the manufacturing is difficult. Even if Vc / Ve is less than 0.4, the manufacturing difficulty can be reduced while ensuring the efficiency of the rotary compressor 100.

[0049] According to the rotary compressor 100 of the embodiment of the present invention, by arranging the motor 1, a driving force can be provided for the crankshaft 21, so that the crankshaft 21 can drive the eccentric member 25 to move to compress the gas, realizing the compression function of the rotary compressor 100. At the same time, a first bearing 22 and a second bearing 24 are sleeved outside the crankshaft 21. The cylinder 23 can be sealed through the first bearing 22 and the second bearing 24 to improve the reliability of gas compression, and the crankshaft 21 can be supported through the first bearing 22 and the second bearing 24 to reduce the vibration of the crankshaft 21. Moreover, by arranging the buffer groove 26, the suction volume of the rotary compressor 100 can be increased, the noise can be reduced, and the efficiency of the rotary compressor 100 can be effectively improved by reasonably setting the volume of the buffer groove 26.

[0050] In some embodiments, the diameter of the communication hole 232 is d, and it satisfies: 1 mm ≤ d ≤ 4 mm.

[0051] Specifically, the communication hole 232 is used to connect the suction hole 231 with the buffer groove 26, so that part of the gas can enter the buffer groove 26 during the suction reflux process, thereby shortening the gas flow path, reducing the gas flow loss, and further improving the suction efficiency of the rotary compressor 100 and increasing the suction volume. The diameter d of the communication hole 232 determines the gas flow rate between the suction hole 231 and the buffer groove 26 and the processing difficulty of the communication hole 232. When d is large, the gas flow rate is low. When d is small, the processing difficulty of the communication hole 232 is large. When d is between 1 mm and 4 mm, the processing difficulty of the communication hole 232 can be reduced while ensuring the gas flow rate.

[0052] Further, d can be 1 mm, 2 mm, 3 mm, 4 mm, etc., so as to reduce the processing difficulty of the communication hole 232 while enabling a relatively fast flow rate of the gas. That is, by reasonably setting the diameter of the communication hole 232, the processing difficulty of the communication hole 232 can be reduced while enabling a relatively fast flow rate of the gas, which is beneficial to improving the efficiency of the rotary compressor 100.

[0053] In some embodiments, it satisfies: 45° ≤ α ≤ 70°.

[0054] Specifically, α is the angle between the central axis of the communication hole 232 and the end face of the cylinder 23. When α is between 45° and 70°, it is convenient for the gas to quickly enter the buffer groove 26. When α is relatively large, when the gas enters the buffer groove 26 from the suction hole 231, it needs to change the flow direction at the entrance of the communication hole 232 first, which is not convenient for the gas to enter the buffer groove 26. When α is relatively small, the length of the communication hole 232 will become longer, resulting in a longer flow path of the gas, which is not beneficial to improving the efficiency of the rotary compressor 100. Further, α can be 45°, 60°, 70°, etc., so as to shorten the flow path of the gas while facilitating the gas to enter the buffer groove 26 from the suction hole 231. That is, by reasonably setting the angle between the central axis of the communication hole 232 and the end face of the cylinder 23, it is convenient for the gas to quickly enter the buffer groove 26, which is beneficial to improving the efficiency of the rotary compressor 100.

[0055] In some embodiments, the communication hole 232 communicates with the suction hole 231 on the side close to the first bearing 22.

[0056] Specifically, the communication hole 232 is communicated with the suction hole 231 so that the gas can enter the buffer groove 26 from the suction hole 231 through the communication hole 232. The communication hole 232 is communicated with the suction hole 231 on the side of the suction hole 231 close to the first bearing 22, and the first bearing 22 is arranged above the cylinder 23, so that the communication hole 232 can be communicated with the upper side of the suction hole 231, and the buffer groove 26 is arranged above the suction hole 231, so that the gas can flow upward into the buffer groove 26 while flowing out of the suction hole 231, and liquid accumulation can be avoided.

[0057] In some embodiments, the buffer groove 26 is arranged on the end face of the cylinder 23 close to the first bearing 22. Specifically, as Figure 3 shown, the buffer groove 26 is used for storing the gas. The buffer groove 26 can be arranged on the cylinder 23 and on the upper end face of the cylinder 23, so that the gas can flow upward into the buffer groove 26 while flowing out of the suction hole 231. Thus, the buffer groove 26 can be used to store the gas to shorten the flow path of the gas, reduce the flow loss, and avoid liquid accumulation.

[0058] In some other embodiments, the end face of the cylinder 23 and the end face of the first bearing 22 jointly define a buffer groove 26. Specifically, as Figure 4 shown, the first bearing 22 is arranged above the cylinder 23, and the buffer groove 26 can be arranged between the first bearing 22 and the cylinder 23, so that the upper end face of the cylinder 23 and the lower end face of the first bearing 22 can jointly define the buffer groove 26, which can reduce the processing steps of the buffer groove 26 and is beneficial to the production of the rotary compressor 100.

[0059] In some embodiments, the communication hole 232 communicates with the suction hole 231 on the side close to the second bearing 24.

[0060] Specifically, by connecting the communication hole 232 with the suction hole 231, gas can enter the buffer groove 26 from the suction hole 231 through the communication hole 232. Connecting the communication hole 232 with the suction hole 231 on the side of the suction hole 231 close to the second bearing 24, and the second bearing 24 is arranged below the cylinder 23, the communication hole 232 can be connected to the lower side of the suction hole 231, so that the gas can flow downward into the buffer groove 26 while flowing out of the suction hole 231.

[0061] In some embodiments, the buffer groove 26 is arranged on the end face of the cylinder 23 close to the second bearing 24. Specifically, the buffer groove 26 is used for storing gas. The buffer groove 26 can be arranged on the cylinder 23 and on the lower end face of the cylinder 23, so that the gas can flow downward into the buffer groove 26 while flowing out of the suction hole 231. Thus, the buffer groove 26 can be used to store gas to shorten the gas flow path and reduce the flow loss.

[0062] And it should be noted that, as Figure 3 shown, buffer grooves 26 can also be arranged on the end faces of the cylinder 23 close to the first bearing 22 and the second bearing 24, that is, buffer grooves 26 are arranged on the upper end face and the lower end face of the cylinder 23 at the same time, which can increase the number of buffer grooves 26 and the volume of the buffer grooves 26, and is beneficial to improving the efficiency of the rotary compressor 100.

[0063] In some other embodiments, the end face of the cylinder 23 and the end face of the second bearing 24 jointly define a buffer groove 26. Specifically, the second bearing 24 is arranged below the cylinder 23, and the buffer groove 26 can be arranged between the second bearing 24 and the cylinder 23, so that the lower end face of the cylinder 23 and the upper end face of the second bearing 24 can jointly define the buffer groove 26, which can reduce the processing steps of the buffer groove 26 and is beneficial to the production of the rotary compressor 100.

[0064] In some embodiments, there are multiple buffer grooves 26, and adjacent buffer grooves 26 are communicated with each other, and one of the multiple buffer grooves 26 is connected to the communication hole 232.

[0065] Specifically, the buffer tank 26 is used to store gas. A plurality of buffer tanks 26 can be arranged in the rotary compressor 100. That is, the number of buffer tanks 26 can be two, three or more. The gas can be stored by a plurality of buffer tanks 26 at the same time, the volume of the buffer tank 26 can be increased, and then the suction volume of the rotary compressor 100 can be increased. Moreover, by connecting adjacent two buffer tanks 26, a plurality of buffer tanks 26 can be connected in sequence, so that the gas can flow between a plurality of buffer tanks 26.

[0066] In addition, by connecting one of the plurality of buffer tanks 26 to the communication hole 232, any one of the buffer tanks 26 can be connected to the communication hole 232, so that the gas can enter the buffer tank 26 connected thereto from the communication hole 232 and then flow to other buffer tanks 26 in sequence. Thus, only one communication hole 232 needs to be provided, and the gas can enter a plurality of buffer tanks 26 in sequence. Thereby, the number of communication holes 232 can be reduced, and the processing difficulty and setting cost of the rotary compressor 100 can be reduced.

[0067] In some embodiments, the total volume Vc of the buffer tanks 26 is the sum of the volumes of a plurality of buffer tanks 26; wherein, the volume of a single buffer tank 26 is the product of the area S enclosed by the contour of the buffer tank 26 and the depth H of the buffer tank 26.

[0068] Specifically, the buffer tank 26 is used to store gas. As Figures 5 - 7 shown, one or more buffer tanks 26 can be arranged in the rotary compressor 100. When only one buffer tank 26 is arranged, the volume of the buffer tank 26 can be made larger to meet the gas storage requirements. When a plurality of buffer tanks 26 are arranged at the same time, the volume of each buffer tank 26 can be made smaller, and the total volume Vc of the buffer tanks 26 is the sum of the volumes of a plurality of buffer tanks 26. That is, the gas storage requirements can be met by arranging a plurality of buffer tanks 26 at the same time. Moreover, by arranging a plurality of buffer tanks 26, the insufficient local structural strength of the cylinder 23 can be avoided, that is, it is beneficial to improve the structural strength of the cylinder 23.

[0069] In addition, the volume of a single buffer tank 26 is the product of the area S enclosed by the contour of the buffer tank 26 and the depth H of the buffer tank 26. That is, when a plurality of buffer tanks 26 are arranged at the same time, as Figures 6 - 7 shown, the depths of a plurality of buffer tanks 26 can be the same. At this time, the total volume Vc of all buffer tanks 26 is the product of the sum of the areas enclosed by the contours of all buffer tanks 26 and the depth. Furthermore, when calculating the volume of the buffer tank 26 according to the gas storage requirements, the calculation can be carried out only from the dimension of the area enclosed by the contour of the buffer tank 26, and the calculation process and steps can be simplified.

[0070] In some embodiments, the number of poles of the rotor 12 is P, and it satisfies: 10 ≤ P ≤ 12; and / or, the number of slots of the motor 1 is Q, and it satisfies: 15 ≤ Q ≤ 18.

[0071] Specifically, the larger the number of poles P of the rotor 12, the higher the synchronous speed of the motor 1 and the smaller the torque ripple. However, a larger number of poles may lead to an increase in the size and weight of the motor 1. The more slots the motor 1 has, the more uniform the magnetic flux distribution is, and the higher the power density of the motor 1, that is, the higher the efficiency of the motor 1. However, a larger number of slots will increase the manufacturing cost and design complexity of the motor 1. P can be between 10 and 12, that is, P can be 10, 11, or 12, and Q can be between 15 and 18, that is, Q can be 15, 16, 17, or 18. That is, the motor 1 in this application can be a 15-slot 10-pole or an 18-slot 12-pole, etc. By reasonably setting the number of poles of the rotor 12 and the number of slots of the motor 1, the efficiency of the motor 1 can be improved, and thus the efficiency of the rotary compressor 100 can be improved.

[0072] In some embodiments, the number of phases of the motor 1 is m, and it satisfies:

[0073] Specifically, Q is the number of slots of the motor 1, and P is the number of poles of the rotor 12. Let Then it can make That is, the ratio between the number of slots of the motor 1 and the number of poles of the rotor 12 is less than the number of phases of the motor 1, which can reduce the harmonics generated by the motor 1, thereby reducing vibration and noise, improving the running stability of the motor 1. And a smaller ratio helps to obtain a smoother torque output, reduce torque ripple, and can reduce hysteresis and eddy current losses, improve the efficiency of the motor 1. Also, it can improve the design flexibility of the motor 1, allowing designers to adjust the number of slots of the motor 1 and the number of poles of the rotor 12 according to specific application requirements to improve the performance of the motor 1 as much as possible.

[0074] In some embodiments, the number of cylinders 23 is at least one, and the ratio of the number of poles of the rotor 12 to the number of cylinders 23 is greater than or equal to 10.

[0075] Specifically, the number of cylinders 23 in the rotary compressor 100 can be one or more. As the number of cylinders 23 increases, the flow rate and compression capacity of the rotary compressor 100 can be improved. And the number of poles of the rotor 12 affects the rotational speed of the rotary compressor 100, and thus affects the flow rate and compression capacity. Make the ratio of the number of poles of the rotor 12 to the number of cylinders 23 greater than or equal to 10. For example, when the number of cylinders 23 is 1, the number of poles of the rotor 12 can be 10, 12, or 16, etc. When the number of cylinders 23 is 2, the number of poles of the rotor 12 can be 20, 24, or 28, etc. That is, the number of poles of the rotor 12 can be increased while the number of cylinders 23 is increased to ensure the driving ability of the motor 1 and the compression capacity of the rotary compressor 100, and thus ensure the reliable operation of the rotary compressor 100.

[0076] And, it should be noted that if Figure 1 , Figure 3 and Figure 4 As shown, the first bearing 22 includes a first radial portion 221 and a first axial portion 222, and the second bearing 24 includes a second radial portion 241 and a second axial portion 242. The first axial portion 222 and the second axial portion 242 are both sleeved on the outer side of the crankshaft 21 for supporting the crankshaft 21, and the first axial portion 222 and the second axial portion 242 are both extended along the axial direction of the crankshaft 21, which can increase the matching length between the crankshaft 21 and improve the reliability of supporting the crankshaft 21. The first radial portion 221 is connected to the first axial portion 222, and the second radial portion 241 is connected to the second axial portion 242, so that the first bearing 22 and the second bearing 24 are respectively an integral whole to improve the structural strength of the first bearing 22 and the second bearing 24, and the first radial portion 221 and the second radial portion 241 are both extended along the radial direction of the crankshaft 21 to increase the coverage of the cylinder 23 and improve the reliability of sealing the cylinder 23.

[0077] In addition, the rotary compressor 100 also includes a shell 4, which is used to provide an installation position for the components in the rotary compressor 100 and protect them to avoid damage and failure due to collision. Moreover, the first bearing 22 and the second bearing 24 are detachably connected via a connecting member 5, so that the first bearing 22 and the second bearing 24 can be fixed to improve the reliability of supporting the crankshaft 21 via the first bearing 22 and the second bearing 24. The connection method via the connecting member 5 is simple, reliable, and easy to operate, and can facilitate the connection of the first bearing 22 and the second bearing 24, or the separation of the two, so that the first bearing 22 or the second bearing 24 can be replaced when it is worn and fails, thereby reducing the maintenance cost of the rotary compressor 100.

[0078] Among them, the connecting member 5 can be a bolt, and the first bearing 22 and the second bearing 24 can be connected by multiple bolts to improve the connection reliability between the two, and the multiple bolts can be distributed at intervals along the circumference of the first bearing 22 and the second bearing 24 to connect the first bearing 22 and the second bearing 24 at multiple positions at the same time, which can improve the connection stability between the two.

[0079] The utility model also provides a refrigeration device.

[0080] A refrigeration device according to an embodiment of the present utility model is provided with a rotary compressor 100 as described in any one of the above. By providing a motor 1, a driving force can be provided for a crankshaft 21, so that the crankshaft 21 can drive an eccentric member 25 to move to compress gas, realizing the compression function of the rotary compressor 100. At the same time, a first bearing 22 and a second bearing 24 are sleeved outside the crankshaft 21, and the cylinder 23 can be sealed through the first bearing 22 and the second bearing 24, improving the reliability of gas compression, and the crankshaft 21 can be supported through the first bearing 22 and the second bearing 24 to reduce the vibration of the crankshaft 21. Moreover, by providing a buffer groove 26, the suction volume of the rotary compressor 100 can be increased, the noise can be reduced, and the efficiency of the rotary compressor 100 can be effectively improved by reasonably setting the volume of the buffer groove 26. Among them, the refrigeration device can be an air conditioner.

[0081] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0082] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A rotary compressor, characterized in that: include: A motor, comprising a stator and a rotor; A pump body component, the pump body component comprising a crankshaft, a first bearing, a cylinder and a second bearing, one end of the crankshaft being connected to the rotor, the other end of the crankshaft being sequentially passed through the first bearing, the cylinder and the second bearing and being connected to an eccentric member in the cylinder, the cylinder being provided with an air intake hole radially open outward and a connecting hole connected to the air intake hole, and the pump body component being further provided with a buffer groove, the buffer groove being connected to the air intake hole through the connecting hole; The angle between the central axis of the connecting hole and the end surface of the cylinder is α, the total volume of the buffer tank is Vc, the displacement of the rotary compressor is Ve, and the following conditions are satisfied: 45°≤α≤90°, 2. The rotary compressor according to claim 1, characterized in that: The diameter of the connecting hole is d, and satisfies: 1mm≤d≤4mm.

3. The rotary compressor according to claim 1, characterized in that: Satisfies: 45°≤α≤70°.

4. The rotary compressor according to claim 1, characterized in that: The communicating hole is communicated with a side of the air suction hole close to the first bearing.

5. The rotary compressor according to claim 4, characterized in that: The buffer groove is arranged on the end surface of the cylinder close to the first bearing; Alternatively, the end surface of the cylinder and the end surface of the first bearing jointly define the buffer groove.

6. The rotary compressor according to claim 1, characterized in that: The communicating hole is communicated with a side of the air suction hole close to the second bearing.

7. The rotary compressor according to claim 6, characterized in that: The buffer groove is arranged on the end surface of the cylinder close to the second bearing; Alternatively, the end surface of the cylinder and the end surface of the second bearing jointly define the buffer groove.

8. The rotary compressor according to claim 1, characterized in that: There are a plurality of buffer grooves, and two adjacent buffer grooves are connected to each other, and one of the plurality of buffer grooves is connected to the connecting hole.

9. The rotary compressor according to claim 8, characterized in that: The total volume Vc of the buffer tank is the sum of the volumes of the plurality of buffer tanks; The volume of a single buffer groove is the product of an area S enclosed by the outline of the buffer groove and a depth H of the buffer groove.

10. The rotary compressor according to claim 1, characterized in that The number of poles of the rotor is P, and satisfies: 10≤P≤12; And / or, the number of slots of the motor is Q, and satisfies: 15≤Q≤18.

11. The rotary compressor according to claim 10, characterized in that: The number of phases of the motor is m, satisfying: mQP<1.

12. The rotary compressor according to claim 1, characterized in that There is at least one cylinder, and the ratio of the number of poles of the rotor to the number of the cylinders is greater than or equal to 10.

13. A refrigeration device, characterized in that: A rotary compressor according to any one of claims 1 to 12 is provided.

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