Compressor and refrigeration apparatus

Abstract

This invention discloses a compressor and refrigeration equipment, relating to the field of compressor technology. The compressor includes a housing, a pump assembly, a motor assembly, and a flow guiding mechanism. The flow guiding mechanism is located above the rotor and can rotate synchronously with the rotor. When the flow guiding mechanism rotates under the drive of the rotor, it can accelerate the flow of gas above the rotor and form a negative pressure, increasing the flow velocity of oil and gas in the rotor. This allows the oil and gas to flow upward more quickly along the flow holes of the rotor, maximizing the utilization of the rotor's flow area and making the flow of oil and gas smoother, thereby improving the accumulation of oil and gas below the rotor. After the oil and gas separate above the rotor, the refrigerant oil can fall back to the oil sump along the stator's oil return channel, improving the compressor's oil return effect and enhancing the compressor's reliability.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a compressor and refrigeration equipment. Background Technology

[0002] In related technologies, a rolling rotor compressor transmits the rotational force of the motor assembly to the pump body via a crankshaft. For models with a large compressor displacement but a small rotor flow area, the oil and gas discharged from the pump body flows upward through the rotor at a low speed, causing the oil and gas to accumulate below the motor assembly. This makes it difficult for the refrigerant oil above the motor assembly to flow back to the oil sump, resulting in a lack of oil in the compressor. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a compressor that can accelerate the upward flow of oil and gas through the rotor, thereby improving the oil return effect of the compressor.

[0004] The present invention also proposes a refrigeration device having the above-mentioned compressor.

[0005] A compressor according to a first aspect of the present invention includes: a housing; a pump assembly disposed within the housing, the pump assembly including a cylinder and a crankshaft, the eccentric portion of the crankshaft being rotatably disposed within the cylinder; a motor assembly disposed within the housing and located above the cylinder, the motor assembly including a stator and a rotor, the stator being fixedly connected to the housing, and the rotor being fixedly connected to the crankshaft; and a flow guiding mechanism disposed above the rotor, the flow guiding mechanism being capable of rotating synchronously with the rotor.

[0006] The compressor according to embodiments of the present invention has at least the following beneficial effects:

[0007] By installing a flow guide mechanism above the rotor and enabling it to rotate synchronously with the rotor, the flow guide mechanism, driven by the rotor, accelerates the flow of gas above the rotor and creates a negative pressure. This increases the flow velocity of oil and gas within the rotor, allowing the oil and gas to flow upwards more quickly along the rotor's flow holes. This maximizes the utilization of the rotor's flow area, making the flow of oil and gas smoother and thus improving the accumulation of oil and gas below the rotor. After the oil and gas separate above the rotor, the refrigerant oil can fall back into the oil sump along the stator's oil return channel, improving the compressor's oil return effect and enhancing its reliability.

[0008] According to some embodiments of the present invention, the flow guiding mechanism includes an annular plate and blades, the peripheral wall of the annular plate is provided with a first through hole, and the blades are connected to the annular plate and configured to guide the airflow passing through the first through hole when the flow guiding mechanism rotates.

[0009] According to some embodiments of the present invention, the blade is disposed on one side wall of the first through hole along the circumference of the annular plate.

[0010] According to some embodiments of the present invention, the blade is a straight blade, and the blade is formed by stamping the annular plate.

[0011] According to some embodiments of the present invention, the blades are disposed on the side of the annular plate near the central axis of the rotor.

[0012] According to some embodiments of the present invention, the opening of the blade is oriented toward the rotation direction of the rotor.

[0013] According to some embodiments of the present invention, on a projection plane perpendicular to the central axis of the rotor, the angle between the blade and the tangent at the peripheral wall of the annular plate is α, satisfying: 30°≤α≤60°.

[0014] According to some embodiments of the present invention, the length of the blade is L and the outer radius of the annular plate is R, satisfying: 0.1≤L / R≤0.24.

[0015] According to some embodiments of the present invention, the blades are provided in multiples, and the multiple blades are evenly distributed along the circumference of the annular plate, and the number of the first through holes is equal to the number of the blades.

[0016] According to some embodiments of the present invention, the number of blades is n, and the number of magnet slots of the rotor is N, satisfying: N≤n≤2N.

[0017] According to some embodiments of the present invention, the flow guiding mechanism further includes a base plate connected to the lower end of the annular plate, the base plate being fixedly connected to the upper end of the rotor.

[0018] According to some embodiments of the present invention, the base plate is further provided with a second through hole for exposing the flow passage of the rotor, the second through hole being located directly below the blade.

[0019] According to some embodiments of the present invention, the height of the annular plate is h, and the stator includes a stator core and an upper coil connected to the upper end of the stator core, wherein the height of the upper coil is H, satisfying: H / 3≤h≤H.

[0020] According to some embodiments of the present invention, the compressor further includes a motor bearing located above the rotor and rotatably connected to one end of the crankshaft extending through the rotor.

[0021] A refrigeration device according to a second aspect of the present invention includes the compressor described in the above embodiments.

[0022] The refrigeration device according to embodiments of the present invention has at least the following beneficial effects:

[0023] The compressor using the first aspect embodiment has a flow guiding mechanism installed above the rotor, which rotates synchronously with the rotor. When the flow guiding mechanism rotates under the drive of the rotor, it can accelerate the flow of gas above the rotor and form a negative pressure, increasing the flow velocity of oil and gas in the rotor. This allows the oil and gas to flow upward more quickly along the flow holes of the rotor, maximizing the utilization of the rotor's flow area and making the flow of oil and gas smoother, thereby improving the accumulation of oil and gas below the rotor. After the oil and gas separate above the rotor, the refrigerant oil can fall back to the oil sump along the stator's oil return channel, improving the compressor's oil return effect and enhancing the operational stability of the refrigeration equipment.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a cross-sectional schematic diagram of a compressor according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Assembly drawing of the rotor and guide mechanism;

[0028] Figure 3 for Figure 2 Exploded view of the rotor and guide mechanism;

[0029] Figure 4 for Figure 2 Top view of the central guide mechanism;

[0030] Figure 5 for Figure 2 Front view of the central guide mechanism;

[0031] Figure 6 This is a schematic diagram of the flow guiding mechanism in a compressor according to another embodiment of the present invention;

[0032] Figure 7 The diagram shows a simulated fluid flow of a compressor based on related technologies, but without the flow guiding mechanism of this embodiment installed inside.

[0033] Figure 8 This is a simulated fluid diagram of the compressor in an embodiment of the present invention.

[0034] Icon labels:

[0035] 100 housing; 110 mounting cavity; 120 base; 130 exhaust pipe;

[0036] Pump body assembly 200; crankshaft 210; eccentric part 211; central oil hole 212; upper bearing 220; lower bearing 230; piston 240; first cylinder 250; second cylinder 260; partition assembly 270; muffler 280;

[0037] Motor assembly 300; stator 310; stator core 311; coil 312; upper coil 3121; lower coil 3122; rotor 320; flow passage 321; magnet slot 322; balance weight 330;

[0038] Flow guiding mechanism 400; annular plate 410; first through hole 411; blade 420; base plate 430; second through hole 431; third through hole 432; rivet 440;

[0039] Motor bearing 500; mounting base 510; bearing housing 520;

[0040] Liquid reservoir 600; air inlet pipe 610. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0044] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0045] In related technologies, rolling rotor compressors transmit the rotational power of the motor to the pump body via the crankshaft, enabling the pump body to compress the refrigerant. However, for large-displacement compressors, if the rotor's flow area is insufficient, the upward flow speed of the oil and gas discharged from the pump body is low. Due to the large discharge volume of the pump body, some oil and gas will flow upward in the stator's oil return channel; moreover, after a period of operation, oil and gas will accumulate below the motor, obstructing the upward flow path. This causes the oil and gas to separate above the motor, making it difficult for the refrigerant oil to return to the oil sump through the stator's oil return channel, resulting in oil shortage in the compressor and affecting its safe operation.

[0046] To address the compressor issues in related technologies, refer to... Figure 1 As shown, a compressor according to one embodiment of the present invention includes a housing 100, and a pump assembly 200 and a motor assembly 300 installed inside the housing 100. An installation cavity 110 is formed inside the housing 100, and the bottom of the installation cavity 110 forms a space for storing refrigerant oil, i.e., an oil sump. A base 120 is provided at the bottom of the housing 100, which can be welded and fixed to the housing 100, and the base 120 is used to achieve stable installation of the compressor. An exhaust pipe 130 is provided at the top of the housing 100, and the exhaust pipe 130 is used to discharge the refrigerant from the installation cavity 110.

[0047] Reference Figure 1 As shown, the pump assembly 200 includes components such as a cylinder, crankshaft 210, upper bearing 220, lower bearing 230, and piston 240. A compression chamber is formed within the cylinder. The crankshaft 210 includes an eccentric portion 211, which houses the piston 240 and rotatably positions it within the compression chamber. The upper bearing 220 and lower bearing 230 are fixedly connected to the upper and lower ends of the cylinder, respectively, sealing the upper and lower ends of the compression chamber. Both the upper bearing 220 and lower bearing 230 may have exhaust ports, or only one of them may have an exhaust port; this is not specifically limited here. The cylinder also has an air inlet port, which communicates with the compression chamber. It is understood that the compressor in this embodiment of the invention also includes a liquid receiver 600, which is connected to the air inlet port via an air inlet pipe 610.

[0048] When the crankshaft 210 rotates, the piston 240 rotates close to the inner surface of the compression chamber, so that a crescent-shaped space can be formed between the outer surface of the piston 240 and the inner surface of the compression chamber. Through intake, compression and exhaust, the pump assembly 200 compresses the intake refrigerant to do work.

[0049] Reference Figure 1As shown, this embodiment of the invention has two cylinders, namely a first cylinder 250 and a second cylinder 260, with the first cylinder 250 located above the second cylinder 260. A partition assembly 270 is fixedly connected between the first cylinder 250 and the second cylinder 260, sealing the lower end of the first cylinder 250 and the upper end of the second cylinder 260. An upper bearing 220 is fixedly connected to the upper end of the first cylinder 250, thereby sealing the upper end of the first cylinder 250. A lower bearing 230 is fixedly connected to the lower end of the second cylinder 260, thereby sealing the lower end of the second cylinder 260. Correspondingly, the crankshaft 210 includes two eccentric portions 211, which are rotatably disposed within the compression chambers of the first cylinder 250 and the second cylinder 260, respectively. The reservoir 600 is equipped with two air inlet pipes 610, which are respectively connected to the first cylinder 250 and the second cylinder 260, supplying air to both cylinders. Both the upper bearing 220 and the lower bearing 230 are equipped with exhaust ports. The exhaust port of the upper bearing 220 supplies exhaust to the first cylinder 250, and the exhaust port of the lower bearing 230 supplies exhaust to the second cylinder 260. To reduce exhaust noise, a muffler 280 is installed above the upper bearing 220 and below the lower bearing 230.

[0050] Furthermore, in another embodiment of the present invention, the compressor may have three or more cylinders, and its structure is similar to that of the above embodiments. The above embodiments can be appropriately referenced for understanding. To avoid repetition, further details are omitted here.

[0051] Reference Figure 1 As shown, the motor assembly 300 is located above the first cylinder 250. The motor assembly 300 includes a stator 310 and a rotor 320. The stator 310 can be fixed to the inner wall of the housing 100 by welding or heat fitting. The stator 310 has a cavity at its center to accommodate the rotor 320, and the rotor 320 is rotatably connected to the stator 310. The stator 310 includes a stator core 311 and a coil 312. The coil 312 protrudes above the stator core 311 to form an upper coil 3121, and protrudes below the stator core 311 to form a lower coil 3122. The core has a return oil channel for the return of refrigerant oil, which can be a through hole running vertically. For example, the through hole is formed inside the core or on a cut edge of the core. The rotor 320 is fixedly connected to the crankshaft 210, and the crankshaft 210 rotates under the drive of the rotor 320. (Refer to...) Figure 2 and Figure 3 As shown, the rotor 320 is provided with a flow passage 321, which connects the upper and lower ends of the rotor 320, thereby connecting the upper cavity and the lower cavity of the rotor 320.

[0052] Reference Figure 1 and Figure 2As shown, the compressor of this embodiment of the invention also includes a flow guiding mechanism 400. The flow guiding mechanism 400 is disposed above the rotor 320. In order for the flow guiding mechanism 400 to achieve stable rotation, thereby generating airflow and forming a negative pressure above the rotor 320, the flow guiding mechanism 400 needs to rotate synchronously with the rotor 320. For example, the flow guiding mechanism 400 can be fixedly connected to the rotor 320 or fixedly connected to the crankshaft 210. Therefore, when the flow guiding mechanism 400 rotates under the drive of the rotor 320, it can drive the gas in the upper cavity of the rotor 320 to flow faster and form a negative pressure, thereby increasing the pressure difference between the lower cavity and the upper cavity of the rotor 320, increasing the flow velocity of oil and gas in the rotor 320, and allowing oil and gas to flow upward more quickly along the flow passage 321, maximizing the utilization of the flow area of ​​the rotor 320, making the flow of oil and gas smoother, and thus improving the phenomenon of oil and gas accumulation below the rotor 320. After the oil and gas separate in the upper cavity of the rotor 320, the accumulation of oil and gas below the rotor 320 is improved. Therefore, the refrigeration oil can fall back to the oil sump along the oil return channel of the stator 310, which improves the oil return effect of the compressor, effectively improves the oil shortage situation of the compressor, and enhances the reliability of the compressor.

[0053] Reference Figure 2 and Figure 4As shown, the flow guiding mechanism 400 includes an annular plate 410 and blades 420. The annular plate 410 is mounted on the upper end of the rotor 320. The annular plate 410 can be directly connected to the rotor 320, for example, by welding to the rotor 320; the annular plate 410 can also be indirectly connected to the rotor 320, for example, by welding, screwing, or riveting to the rotor 320 through connectors. The annular plate 410 can be arranged along the outer periphery of the rotor 320, with the flow passage 321 located inside the annular plate 410. As another embodiment, the annular plate 410 can also surround part of the upper end face of the rotor 320, with the flow passage 321 located outside the annular plate 410. The peripheral wall of the annular plate 410 is provided with a first through hole 411, and the blades 420 are connected to the annular plate 410. When the flow guiding mechanism 400 rotates under the drive of the rotor 320, under the guiding action of the blades 420, an airflow is formed through the first through hole 411, thereby accelerating the airflow speed and forming a negative pressure. It is understood that the blade 420 can be located on the inner side or the outer side of the annular plate 410, and the blade 420 can be positioned towards or away from the rotation direction of the crankshaft 210. Therefore, depending on the direction and position of the blade 420, the airflow direction can be from the inner side to the outer side of the annular plate 410, or from the outer side to the inner side. The purpose is to accelerate the airflow velocity above the flow passage 321, and simultaneously create a negative pressure in the upper cavity of the rotor 320, further increasing the upward flow velocity of the oil and gas. It is understood that the first through-hole 411 can be formed in the middle of the annular plate 410 along the vertical direction, meaning that the upper end of the first through-hole 411 is at a certain distance from the upper end of the annular plate 410. Alternatively, the upper end of the first through-hole 411 can be aligned with the upper end of the annular plate 410, or the lower end of the first through-hole 411 can be aligned with the lower end of the annular plate 410.

[0054] As another implementation, the flow guiding mechanism 400 can also be a structure such as an axial flow fan or a centrifugal fan that can achieve negative pressure in the space above the rotor 320.

[0055] Reference Figure 2 As shown, the blade 420 is disposed on one side wall of the first through hole 411 along the circumference of the annular plate 410, for example, on the front or rear side along the rotation direction of the crankshaft 210. The blade 420 is connected to the side wall of the first through hole 411, and the blade 420 can guide the airflow when it passes through the first through hole 411, and the guidance is smoother and the wind resistance is smaller.

[0056] It is understandable that multiple blades 420 and multiple first through holes 411 are provided, with the number of first through holes 411 equal to the number of blades 420. Therefore, during rotation, the flow guiding mechanism 400 can achieve a better flow guiding effect through the drive of multiple blades 420, accelerating the flow speed of oil and gas and effectively utilizing the flow area of ​​the rotor 320. The multiple blades 420 and multiple first through holes 411 can be evenly distributed along the circumference of the annular plate 410, making the overall force on the flow guiding mechanism 400 more uniform and the rotation more stable and reliable.

[0057] Reference Figure 2 As shown, the blade 420 is located on the side of the annular plate 410 near the central axis of the rotor 320, that is, on the inner side of the annular plate 410. The blade 420 being located on the inner side of the annular plate 410 can further avoid interference between the blade 420 and the stator 310, thereby improving the operational safety of the motor assembly 300.

[0058] Reference Figure 2 and Figure 4 As shown, in one embodiment of the present invention, the opening of the blade 420 of the flow guiding mechanism 400 faces the rotation direction of the rotor 320. When the crankshaft 210 rotates counterclockwise, the opening of the blade 420 faces counterclockwise. When the flow guiding mechanism 400 rotates, the airflow flows from the inside to the outside of the annular plate 410, driving the oil and gas located inside the annular plate 410 to flow to the outside of the annular plate 410, improving the flow guiding efficiency and forming a larger negative pressure. During the process of the oil and gas flowing to the periphery of the annular plate 410, the refrigerant oil can be thrown out to the stator 310. Under the action of gravity, the refrigerant oil flows back to the oil sump at the bottom of the housing 100 through the oil return channel of the stator 310, accelerating the oil return efficiency of the compressor.

[0059] Simulation analysis was performed on the compressors of related technologies and the compressors of the embodiments of this invention, respectively, and the results were obtained. Figure 7 and Figure 8 . Figure 7 The diagram shown is a simulated fluid flow diagram of a compressor from a related technology. This compressor does not have the flow guiding mechanism 400 of this embodiment installed inside. Figure 8 This is a simulated fluid diagram of the compressor according to an embodiment of the present invention. (Comparison) Figure 7 and Figure 8 It can be seen that the flow velocity in the rotor 320 through-hole 321 increases significantly, specifically by 21%.

[0060] Reference Figure 6As shown, in another embodiment of the present invention, the opening of the guide mechanism 400 blade 420 is opposite to the rotation direction of the rotor 320. When the crankshaft 210 rotates counterclockwise, the opening of the blade 420 faces clockwise. When the guide mechanism 400 rotates, the airflow flows from the outside to the inside of the annular plate 410, driving the oil and gas located on the inside of the annular plate 410 upward and then diffused to the surroundings, which also improves the efficiency of the guide. During the diffusion of oil and gas to the surroundings, the refrigerant oil falls onto the surface of the stator 310 under the action of gravity and flows back to the oil sump at the bottom of the housing 100 through the oil return channel, which accelerates the oil return efficiency of the compressor.

[0061] Reference Figure 2 As shown, to facilitate the machining of the flow guiding mechanism 400, the blade 420 is a straight blade, which is formed by stamping through the annular plate 410. Simultaneously, the first through hole 411 is machined while the blade 420 is being stamped from the annular plate 410. Therefore, the overall structural strength of the annular plate 410 and the blade 420 is higher, and the flow guiding mechanism 400 operates more stably.

[0062] Reference Figure 2 and Figure 3 As shown, the flow guiding mechanism 400 also includes a base plate 430, which is located at the lower end of the annular plate 410 and is fixedly connected to the upper end of the rotor 320. The annular plate 410 is mounted to the rotor 320 via the base plate 430, making the assembly of the flow guiding mechanism 400 more convenient. In this embodiment of the invention, the base plate 430 and the rotor 320 are fixedly connected by rivets 440. The motor assembly 300 also includes a balance block 330, which is fixedly connected to the base plate 430. The balance block 330 and the base plate 430 are fixed to the rotor 320 by the same rivet 440, improving assembly efficiency.

[0063] Reference Figure 2 and Figure 4 As shown, the base plate 430 is also provided with a second through hole 431, which corresponds to the flow hole 321 of the rotor 320. The second through hole 431 is used to expose the flow hole 321. It can be understood that there can be multiple second through holes 431, which are respectively provided above one or more flow holes 321, ensuring that the oil and gas in the flow hole 321 can be more smoothly discharged to the chamber above the motor assembly 300 without being interfered with or blocked by the base plate 430. The multiple second through holes 431 and multiple blades 420 are correspondingly arranged so that the oil and gas in the flow hole 321 can be smoothly guided in the chamber above the motor assembly 300.

[0064] The second through hole 431 is located directly below the blade 420. Understandably, the projection of the blade 420 onto the base plate 430 at this point at least partially overlaps with the projection of the second through hole 431, making the guiding effect of the blade 420 on the oil and gas flow more pronounced. Since the blade 420 is located above the flow hole 321, when the guiding mechanism 400 rotates, the blade 420 can quickly guide the oil and gas in the flow hole 321 to the upper cavity of the rotor 320. Simultaneously, the negative pressure generated by the blade 420 can better act on the flow hole 321, increasing the upward flow speed of the oil and gas through the flow hole 321, maximizing the utilization of the rotor 320's flow area, and making the oil and gas flow smoother, thereby improving the oil and gas accumulation phenomenon below the rotor 320.

[0065] Reference Figure 4 As shown, the base plate 430 is provided with a third through hole 432, which is correspondingly provided with the magnet groove 322 of the rotor 320, so that the third through hole 432 can expose the magnet groove 322, thereby making it convenient for installers to observe the magnet groove 322 and to observe whether there are any missing magnets in the magnet groove 322.

[0066] Reference Figure 4 As shown, it can be understood that on the projection plane perpendicular to the central axis of the rotor 320, the angle between the blade 420 and the tangent at the peripheral wall of the annular plate 410 is α, satisfying: 30°≤α≤60°. The size of the angle α determines the magnitude of the disturbance to the upper flow field by the rotating blade 420 of the guide mechanism 400. When the above parameter range is met, the blade 420 can generate a large negative pressure when rotating, improving the flow effect of the rotor 320, and the blade 420 has low wind resistance. When the angle α is too large, although the negative pressure increases, the wind resistance also increases, leading to an increase in the compressor power. When the angle α is too small, the negative pressure is too small, and the improvement on the flow effect of the rotor 320 is not significant.

[0067] It is understandable that when the blade 420 is a straight blade, the included angle α is the angle between the inner or outer profile of the blade 420 and the tangent at the peripheral wall of the annular plate 410; when the blade 420 is an arc-shaped blade 420 or other irregular blades, the included angle α is the angle between the line connecting the two ends of the inner or outer profile of the blade 420 and the tangent at the peripheral wall of the annular plate 410.

[0068] Reference Figure 4As shown, it can be understood that the length of the blade 420 is L, and the outer radius of the annular plate 410 is R, satisfying: 0.1 ≤ L / R ≤ 0.24. Meeting this parameter range balances the magnitude of negative pressure and wind resistance, minimizing wind resistance while ensuring the effectiveness of negative pressure. When L / R is too small, the blade 420 is short, resulting in low negative pressure and poor airflow. When L / R is too large, the blade 420 is long, leading to high wind resistance and poor compressor efficiency.

[0069] Reference Figure 3 and Figure 4 As shown, it can be understood that the number of blades 420 is n, and the number of magnet slots 322 in the rotor 320 is N, satisfying: N≤n≤2N. When the number of blades 420 meets the above parameter range, a good flow field and a good negative pressure can be formed above the rotor 320, allowing the oil and gas to flow upward better. If the number of blades 420 is too small, the flow field formed above the rotor 320 will be small, and sufficient negative pressure cannot be formed. If the number of blades 420 is too large, the wind resistance of the blades 420 will be too large.

[0070] Reference Figure 1 and Figure 5 As shown, it can be understood that the height of the annular plate 410 is h, and the height of the upper coil 3121 is H, satisfying: H / 3 ≤ h ≤ H. The function of the annular plate 410 is for oil-gas separation, and the height h of the annular plate 410 affects the oil-gas separation effect above the rotor 320. When the height h of the annular plate 410 meets the above parameter range, the oil-gas separation effect can be guaranteed while minimizing wind resistance. When the height h of the annular plate 410 is too small, it cannot achieve the separation effect. When the height h of the annular plate 410 is too large, it will create greater wind resistance, affecting the compressor's energy efficiency.

[0071] One embodiment of the compressor of the present invention further includes a motor bearing 500. Particularly for multi-cylinder compressors, the crankshaft 210 has multiple eccentric portions 211, the number of which is the same as the number of cylinders. To improve the rotational stability of the crankshaft 210, a motor bearing 500 is installed inside the housing 100. The motor bearing 500 includes a fixed base 510 and a bearing seat 520. The fixed base 510 can be connected to the bearing seat 520 by means of screwing, welding, riveting, or integral molding. The bearing seat 520 is rotatably connected to the upper end of the crankshaft 210, and the bearing seat 520 is fixedly connected to the inner wall of the housing 100 through the fixed base 510.

[0072] Because the motor bearing 500 is located at the upper end of the crankshaft 210, i.e., the end furthest from the oil sump, the upper end of the crankshaft 210 is far from the oil sump. When the compressor operates at low frequencies, there is insufficient refrigerant oil supply at the motor bearing 500, leading to easy wear of the motor bearing 500. To solve this problem, in this embodiment of the invention, the motor bearing 500 of the compressor is mounted above the rotor 320, with the upper end of the crankshaft 210 extending through the rotor 320 and rotatably connected to the motor bearing 500. When the compressor operates at low frequencies, although the centrifugal force of the rotating crankshaft 210 is insufficient to transport the refrigerant oil from the oil sump to the motor bearing 500, the guide mechanism 400 creates a low pressure in the upper chamber of the rotor 320, and a low pressure is also created at the upper end of the central oil hole 212 of the crankshaft 210. This facilitates the continued transport of refrigerant oil to the low-pressure side within the central oil hole 212, thereby reaching the motor bearing 500 and lubricating the friction pair between the motor bearing 500 and the crankshaft 210. After the motor bearing 500 is fully lubricated, the crankshaft 210 rotates more smoothly, reducing the wear and tear on the crankshaft 210 and the motor bearing 500. This makes the compressor run more stably at low frequencies, enhancing its reliability and improving its overall performance.

[0073] By calculating the oil supply rate of the crankshaft 210 center oil hole 212 through CFD simulation of the compressors of the related technology and the compressor of the present invention, it can be concluded that the oil supply rate of the compressor of the related technology is 61 ml / s, while the oil supply rate of the compressor of the present invention is 78 ml / s, representing an increase of 26%. The significant increase in oil supply rate indicates that the motor bearing 500 of the compressor can be adequately lubricated.

[0074] A refrigeration device according to one embodiment of the present invention includes a compressor, a condenser, an evaporator, and a throttling device. It is understood that the refrigeration device of this embodiment can be an air conditioner, refrigerator, freezer, water dispenser, or air source water heater, etc. The compressor, as the core power component of the refrigeration device, compresses the refrigerant and discharges it, which then passes sequentially through the condenser, the throttling device, and the evaporator before finally re-entering the compressor, thus achieving refrigerant circulation and heat exchange.

[0075] The refrigeration equipment of this invention uses the compressor described in the above embodiment. The compressor has a flow guiding mechanism 400 set above the rotor 320, and the flow guiding mechanism 400 can rotate synchronously with the rotor 320. When the flow guiding mechanism 400 rotates under the drive of the rotor 320, it can drive the gas above the rotor 320 to flow faster and form a negative pressure, which increases the flow speed of oil and gas in the rotor 320, so that the oil and gas can flow upward more quickly along the flow hole 321 of the rotor 320, making full use of the flow area of ​​the rotor 320, making the flow of oil and gas smoother, thereby improving the oil and gas accumulation phenomenon below the rotor 320. After the oil and gas separate above the rotor 320, the refrigeration oil can fall back to the oil sump along the oil return channel of the stator 310, improving the oil return effect of the compressor and improving the operational stability of the refrigeration equipment.

[0076] Since the refrigeration equipment adopts all the technical solutions of the compressor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0077] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. Compressor, characterized in that, The compressor comprises: a housing; a pump body assembly arranged in the housing, the pump body assembly comprising a cylinder and a crankshaft, an eccentric portion of the crankshaft being arranged in the cylinder to rotate; a motor assembly arranged in the housing and above the cylinder, the motor assembly comprising a stator and a rotor, the stator being fixedly connected to the housing, and the rotor being fixedly connected to the crankshaft; a flow guide mechanism arranged above the rotor, the flow guide mechanism being capable of rotating synchronously with the rotor; the flow guide mechanism comprising a ring-shaped plate and a blade, a peripheral wall of the ring-shaped plate being provided with a first through hole, and the blade being connected to the ring-shaped plate and configured to guide airflow passing through the first through hole when the flow guide mechanism rotates; the flow guide mechanism further comprising a bottom plate connected to a lower end of the ring-shaped plate, the bottom plate being fixedly connected to an upper end of the rotor, and the bottom plate being further provided with a second through hole for exposing a through-flow hole of the rotor.

2. The compressor of claim 1, wherein: The blade is arranged on one side wall of the first through hole along a circumferential direction of the ring-shaped plate.

3. The compressor of claim 2, wherein: The blade is a straight blade formed by stamping the ring-shaped plate.

4. The compressor of claim 1, wherein: The blade is arranged on a side of the ring-shaped plate close to a central axis of the rotor.

5. The compressor of claim 1 or 4, wherein: An opening of the blade faces a rotating direction of the rotor.

6. The compressor of claim 1, wherein: An included angle between the blade and a tangent line at the peripheral wall of the ring-shaped plate in a projection plane perpendicular to the central axis of the rotor is α, and 30°≤α≤60° is satisfied.

7. The compressor of claim 1, wherein: A length of the blade is L, and an outer radius of the ring-shaped plate is R, and 0.1≤L / R≤0.24 is satisfied.

8. The compressor of claim 1, wherein: A plurality of blades are arranged along the circumferential direction of the ring-shaped plate, and the number of the first through holes is equal to the number of the blades.

9. The compressor of claim 8, wherein: The number of the blades is n, and the number of magnet grooves of the rotor is N, and N≤n≤2N is satisfied.

10. The compressor of claim 1, wherein: The second through hole is located directly below the blade.

11. The compressor of claim 1, wherein: A height of the ring-shaped plate is h, the stator comprises a stator core and an upper coil wrapped on an upper end of the stator core, a height of the upper coil is H, and H / 3≤h≤H is satisfied.

12. The compressor of claim 1, wherein: The compressor further comprises a motor bearing located above the rotor and rotationally connected to an end of the crankshaft penetrating out of the rotor.

13. A refrigeration appliance characterised in that: The compressor comprises any one of claims 1 to 12.

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