CN115949586A

CN115949586A - Rotary compressor and heat exchange circulating device

Info

Publication number: CN115949586A
Application number: CN202310060348.9A
Authority: CN
Inventors: 小津政雄; 周杏标
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-04-11

Abstract

The invention discloses a rotary compressor and a heat exchange circulating device, and relates to the technical field of compressors. The rotary compressor comprises a shell, a motor and a compression mechanism part; the motor is arranged in the shell and comprises a rotor; the compression mechanism part is arranged in the shell and comprises a cylinder with a compression cavity, a piston which eccentrically rotates in the compression cavity and a slide sheet which reciprocates due to the eccentric rotation of the piston; the compression mechanism part further comprises a crankshaft, the crankshaft comprises a crankshaft body and an eccentric shaft assembly arranged on the crankshaft body, the eccentric shaft assembly at least comprises a first eccentric shaft and a second eccentric shaft which are axially arranged along the crankshaft body at intervals, the piston is sleeved on the peripheries of the first eccentric shaft and the second eccentric shaft, and the rotor is in driving connection with the crankshaft body so as to drive the first eccentric shaft and the second eccentric shaft to drive the piston to eccentrically rotate. The technical scheme of the invention can solve the problem of low reliability of the existing method for improving the discharge capacity of the rotary compressor.

Description

Rotary compressor and heat exchange circulating device

Technical Field

The invention relates to the technical field of compressors, in particular to a rotary compressor and a heat exchange circulating device.

Background

The compressor is one of the important parts in the air conditioner, affects the refrigerating capacity of the air conditioner, and for a single-cylinder rotary compressor, the output power of the compressor can be improved by enlarging the displacement of the compressor.

In order to increase the displacement of the compressor, the outer diameters of the compression mechanism and the motor in the compressor can be increased, but this method requires not only a change in the size of the compressor but also a change in the size of the outdoor unit of the air conditioner on which the compressor is mounted, which affects not only the standardization of the design but also the increase in the manufacturing cost. The discharge capacity of the compressor can be improved by increasing the height of the cylinder in the compressor without changing the outer diameters of the compression mechanism part and the motor in the compressor, but the height of the piston in the cylinder is increased by increasing the height of the cylinder, so that the side pressure acting on the piston is increased, the piston with the increased height is more easily inclined, high-pressure gas on the inner periphery of the piston leaks from the upper end surface and the lower end surface of the piston, the power consumption of the compressor is increased, and the efficiency of the compressor is reduced.

Disclosure of Invention

The invention mainly aims to provide a rotary compressor, aiming at solving the problem of low reliability of the existing method for improving the discharge capacity of the rotary compressor.

In order to achieve the above object, the present invention provides a rotary compressor, comprising:

a housing;

a motor disposed within the housing, the motor including a rotor;

and a compression mechanism part, the compression mechanism part is arranged in the shell and comprises:

the piston is eccentrically rotated in the compression cavity, and the sliding sheet reciprocates due to the eccentric rotation of the piston;

the crankshaft comprises a crankshaft body and an eccentric shaft assembly arranged on the crankshaft body, the eccentric shaft assembly at least comprises a first eccentric shaft and a second eccentric shaft which are axially arranged along the crankshaft body at intervals, the piston is sleeved on the peripheries of the first eccentric shaft and the second eccentric shaft, and the rotor is in driving connection with the crankshaft body so as to drive the first eccentric shaft and the second eccentric shaft to drive the piston to eccentrically rotate.

In an embodiment, the compression mechanism further includes a main bearing and an auxiliary bearing, the main bearing and the auxiliary bearing are respectively disposed on two sides of the cylinder and seal the compression cavity; the part of the crankshaft body, which is positioned on one side of the first eccentric shaft, which is back to the second eccentric shaft, is a main shaft, the part of the crankshaft body, which is positioned on one side of the second eccentric shaft, which is back to the first eccentric shaft, is an auxiliary shaft, the main bearing is sleeved on the main shaft, and the auxiliary bearing is sleeved on the auxiliary shaft.

In one embodiment, an oil supply channel is arranged in the crankshaft body and extends along the axial direction of the crankshaft body, and first oil supply holes communicated with the oil supply channel are formed in the outer peripheral surfaces of the main shaft and the auxiliary shaft.

In an embodiment, a portion of the crankshaft body located between the first eccentric shaft and the second eccentric shaft is a middle shaft, a second oil supply hole communicated with the oil supply channel is formed in the outer peripheral surface of the middle shaft, and oil supply grooves penetrating through end surfaces of two sides of the outer peripheral surfaces of the first eccentric shaft and the second eccentric shaft are formed in the outer peripheral surfaces of the first eccentric shaft and the second eccentric shaft.

In one embodiment, an air inlet communicated with the compression cavity is formed in the peripheral surface of the air cylinder, a main exhaust hole communicated with the compression cavity is formed in one end, back to the air cylinder, of the main bearing, an auxiliary exhaust hole communicated with the compression cavity is formed in one end, back to the air cylinder, of the auxiliary bearing, and an air channel penetrating through end surfaces of two sides of the air cylinder is further formed in the air cylinder and is communicated with the air channel.

In one embodiment, the main bearing and the end of the auxiliary bearing, which faces away from the cylinder, are provided with communication holes for communicating the gas channel, and the compression mechanism further comprises a main muffler and an auxiliary muffler, wherein the main muffler is arranged at the end of the main bearing, which faces away from the cylinder, and the auxiliary muffler is arranged at the end of the auxiliary bearing, which faces away from the cylinder; and the main silencer is provided with a silencer exhaust hole communicated with the main exhaust hole and the communication hole.

In an embodiment, the compression mechanism further includes an oil supply cylinder for storing lubricating oil, the oil supply cylinder being connected to the auxiliary shaft and communicating with the oil supply passage.

In one embodiment, the shell is provided with an air inlet and an air outlet, and the air inlet is communicated with the air inlet.

In one embodiment, the end of the rotor is provided with at least one balance weight for offsetting eccentric loads generated by the eccentric rotation of the first eccentric shaft, the second eccentric shaft and the piston.

The invention also provides a heat exchange circulating device which comprises a first heat exchanger, a throttling device, a second heat exchanger and the rotary compressor, wherein the first heat exchanger, the throttling device and the second heat exchanger are sequentially communicated to form a heat exchange loop.

According to the technical scheme, the volume of the compression cavity is increased by increasing the heights of the cylinder and the piston, the quantity of working media which can be compressed by the rotary compressor is increased, and the increase of the discharge capacity of the rotary compressor is realized. Meanwhile, an eccentric shaft assembly is arranged on the crankshaft body, the eccentric shaft assembly at least comprises a first eccentric shaft and a second eccentric shaft which are axially arranged along the crankshaft body at intervals, the piston is sleeved on the peripheries of the first eccentric shaft and the second eccentric shaft, and the crankshaft body drives the first eccentric shaft and the second eccentric shaft to drive the piston to eccentrically rotate after rotating, so that the compression of working media in a compression cavity is realized. Because the first eccentric shaft and the second eccentric shaft are arranged at intervals along the axial direction of the crankshaft body and can be respectively abutted against the positions of the pistons close to the end parts of the two ends, when the pistons are driven to rotate eccentrically, the stability of the rotation of the pistons is improved, the integral inclination of the pistons caused by the deviation of the end parts is avoided, the working medium in the compression cavity is prevented from being leaked from the end surfaces of the two ends of the pistons, and the reliability and the stability of the operation of the rotary compressor are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a rotary compressor according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken at X in FIG. 1;

FIG. 3 is a schematic view illustrating a crankshaft of an embodiment of the rotary compressor according to the present invention;

FIG. 4 is a schematic view illustrating the engagement of a crankshaft and a piston in an embodiment of a rotary compressor according to the present invention;

FIG. 5 is a schematic illustration of a prior art crankshaft and piston fit.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Rotary compressor	2	Shell body
3	Air outlet	4	Electric machine
				4a	Stator	4b	Rotor
4c	Balancing weight		5						Compression mechanism part
				6	Air inlet	7	Liquid storage device
8	First heat exchanger	9	Second heat exchanger
				10	Main bearing	10a	Main exhaust hole
10b	Communicating hole		11					Main silencer
				11a	Exhaust hole of silencer	12	Cylinder
12a	Compression chamber		12b					Air intake
				12c	Gas channel		13			Piston
14	Sliding vane	15	Secondary bearing
				15a	Auxiliary exhaust hole	16	Sub-silencer
20	Crankshaft	20a	Main shaft
				20b	First eccentric shaft	20c	Intermediate shaft
20d	Second eccentric shaft	20e	Auxiliary shaft
				20f	Second oil supply hole	20g	Oil supply tank
20h	Oil supply channel	20k	First oil supply hole
				21	Oil supply cylinder	31	Throttle device

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The compressor is one of the important parts in the air conditioner, affects the refrigerating capacity of the air conditioner, and for a single-cylinder rotary compressor, the output power of the compressor can be improved by enlarging the displacement of the compressor. In order to increase the displacement of the compressor, the outer diameters of the compression mechanism and the motor in the compressor can be increased, but this method requires not only a change in the size of the compressor but also a change in the size of the outdoor unit of the air conditioner on which the compressor is mounted, which affects not only the standardization of the design but also the increase in the manufacturing cost. The discharge capacity of the compressor can be improved by increasing the height of the cylinder in the compressor without changing the outer diameters of the compression mechanism and the motor in the compressor, but the height of the piston in the cylinder is increased by increasing the height of the cylinder, and the lateral pressure acting on the piston is increased, so that the piston with the increased height is more likely to incline, high-pressure gas in the inner periphery of the piston leaks from the upper end surface and the lower end surface of the piston, the power consumption of the compressor is increased, and the efficiency of the compressor is reduced.

In order to solve the above problems, the present invention provides a rotary compressor.

Referring to fig. 1 to 3, in the present embodiment, the rotary compressor 1 includes a shell 2, a motor 4 and a compression mechanism 5; the motor 4 is arranged in the shell 2, and the motor 4 comprises a rotor 4b; the compression mechanism 5 is provided in the casing 2, and includes a cylinder 12 having a compression chamber 12a, a piston 13 eccentrically rotating in the compression chamber 12a, and a slide plate 14 reciprocating by the eccentric rotation of the piston 13; the compression mechanism portion 5 further includes a crankshaft 20, the crankshaft 20 includes a crankshaft body and an eccentric shaft assembly disposed on the crankshaft body, the eccentric shaft assembly at least includes a first eccentric shaft 20b and a second eccentric shaft 20d disposed at an interval along the axial direction of the crankshaft body, the piston 13 is sleeved on the peripheries of the first eccentric shaft 20b and the second eccentric shaft 20d, and the rotor 4b is in driving connection with the crankshaft body, so as to drive the first eccentric shaft 20b and the second eccentric shaft 20d to drive the piston 13 to eccentrically rotate.

After the heights (shown in the figure Y) of the cylinder 12 and the piston 13 are increased, the volume of the compression cavity 12a is also increased, the number of working mediums which can be compressed by the rotary compressor 1 is increased, and the increase of the displacement of the rotary compressor 1 is realized. Meanwhile, an eccentric shaft assembly is arranged on the crankshaft body, the eccentric shaft assembly at least comprises a first eccentric shaft 20b and a second eccentric shaft 20d which are arranged at intervals along the axial direction of the crankshaft body, the motor 4 further comprises a stator 4a fixed in the shell 2, the rotor 4b can rotate relative to the stator 4a after the motor 4 is started, and the rotor 4b is in driving connection with the crankshaft body and is used for driving the crankshaft body to rotate. The piston 13 is sleeved on the peripheries of the first eccentric shaft 20b and the second eccentric shaft 20d, and the crankshaft body drives the first eccentric shaft 20b and the second eccentric shaft 20d to drive the piston 13 to eccentrically rotate after rotating, so that compression of the working medium in the compression cavity 12a is realized. Because the first eccentric shaft 20b and the second eccentric shaft 20d are axially spaced along the crankshaft body, the eccentric shafts can be respectively abutted against the positions of the piston 13 close to the end parts of the two ends, so that when the piston 13 is driven to eccentrically rotate, the stability of the rotation of the piston 13 is improved, the integral inclination of the piston 13 caused by the deviation of the end parts is avoided, the working medium in the compression cavity 12a is also prevented from leaking from the end surfaces of the two ends of the piston 13, and the reliability and the stability of the operation of the rotary compressor 1 are improved.

Referring to fig. 4 and 5, it can be understood that, for example, when the crankshaft 20 is vertically arranged, in the case that the heights of the cylinder 12 and the piston 13 are increased, because the stability of the crankshaft 20 and the piston 13 in the prior art is insufficient when the crankshaft 20 drives the piston 13 to rotate, the piston 13 is prone to tilting up and down during eccentric rotation, and therefore gaps occur on the upper end surface and the lower end surface of the piston 13, and leakage of the compressed working medium is caused. Meanwhile, the compression cavity 12a forms two independent cavities through the matching connection among the cylinder 12, the piston 13 and the sliding vane 14, so that when the piston 13 rotates eccentrically, the volume of the cavity at one side is gradually reduced to compress the working medium; after the piston 13 is inclined and deflected, a gap is formed between the piston 13 and the sliding vane 14, so that two independent chambers are communicated, and the compressed high-pressure working medium leaks into the chamber on the lower side of the pressure, so that the efficiency of the rotary compressor 1 is reduced.

In this embodiment, the first eccentric shaft 20b and the second eccentric shaft 20d are vertically arranged to realize butt joint of the upper part and the lower part of the inner periphery of the piston 13, and when the piston 13 is driven to eccentrically rotate by the first eccentric shaft 20b and the second eccentric shaft 20d, the stability of the piston 13 in the vertical direction is improved, the probability of vertical inclination is greatly reduced, the phenomenon that a compressed working medium is leaked from the upper end surface and the lower end surface of the piston 13 is avoided, and meanwhile, the phenomenon that a compressed high-pressure working medium is leaked into a chamber on the side with lower pressure is avoided. In order to maintain the rotational stability of the piston 13 in the vertical direction, the eccentric shaft assembly may be provided with a plurality of eccentric shafts in addition to the first eccentric shaft 20b and the second eccentric shaft 20d, but as the number of eccentric shafts increases, the difficulty and cost of processing the crankshaft 20 increase, and the eccentric load of the eccentric shaft assembly during rotation increases, so that it is preferable that the eccentric shaft assembly is provided to include the first eccentric shaft 20b and the second eccentric shaft 20d.

Specifically, the portion of the crankshaft body located on the side of the first eccentric shaft 20b facing away from the second eccentric shaft 20d is a main shaft 20a, and the portion of the crankshaft body located on the side of the second eccentric shaft 20d facing away from the first eccentric shaft 20b is a sub shaft 20e. In order to support the crankshaft 20 and improve the stability of the crankshaft 20 during rotation, in an embodiment, the compression mechanism portion 5 further includes a main bearing 10 and a secondary bearing 15, the main bearing 10 and the secondary bearing 15 are respectively disposed on two sides of the cylinder 12, and seal the compression cavity 12a; the main bearing 10 is sleeved on the main shaft 20a, and the auxiliary bearing 15 is sleeved on the auxiliary shaft 20e.

Further, an oil supply passage 20h is provided in the crankshaft main body so as to extend in the axial direction thereof, and first oil supply holes 20k communicating with the oil supply passage 20h are provided in the outer peripheral surfaces of the main shaft 20a and the auxiliary shaft 20e.

The oil supply passage 20h may be configured to allow a lubricant to flow therethrough, and the lubricant flowing through the oil supply passage 20h may be guided to the outer circumferential surfaces of the main shaft 20a and the sub shaft 20e through the first oil supply hole 20k. The main bearing 10 is sleeved on the main shaft 20a, the auxiliary bearing 15 is sleeved on the auxiliary shaft 20e, and the lubricating oil guided to the peripheral surfaces of the main shaft 20a and the auxiliary shaft 20e can lubricate the connecting surface between the main shaft 20a and the main bearing 10 and the connecting surface between the auxiliary shaft 20e and the auxiliary bearing 15, so that the friction resistance and the friction loss when the crankshaft 20 rotates are reduced, the rotation stability of the crankshaft 20 is improved, and the shaking of the crankshaft 20 is reduced.

Referring to fig. 3, in an embodiment, a portion of the crankshaft body between the first eccentric shaft 20b and the second eccentric shaft 20d is an intermediate shaft 20c, an outer circumferential surface of the intermediate shaft 20c is provided with a second oil supply hole 20f communicated with the oil supply channel 20h, and outer circumferential surfaces of the first eccentric shaft 20b and the second eccentric shaft 20d are provided with oil supply grooves 20g penetrating end surfaces of both sides thereof.

The lubricating oil flowing through the oil supply passage 20h can be guided to the outer peripheral surface of the intermediate shaft 20c through the second oil supply hole 20f, the outer peripheral surface of the intermediate shaft 20c, the inner peripheral surface of the piston 13, and the opposite end surfaces of the first eccentric shaft 20b and the second eccentric shaft 20d form a lubricating oil reservoir, and the lubricating oil guided out through the second oil supply hole 20f can be stored in the lubricating oil reservoir. The outer peripheral surfaces of the first eccentric shaft 20b and the second eccentric shaft 20d are provided with oil supply grooves 20g penetrating through the end surfaces of both sides of the first eccentric shaft 20b and the second eccentric shaft 20d, namely, lubricating oil in the lubricating oil storage chamber can flow to the end surfaces of the first eccentric shaft and the second eccentric shaft 20d, which are back to the lubricating oil storage chamber, through the oil supply grooves 20 g; meanwhile, when the lubricating oil flows through the oil supply groove 20g, the connecting surfaces between the first eccentric shaft 20b and the piston 13 and the second eccentric shaft 20d are fully lubricated, and gaps between the first eccentric shaft 20b and the piston 13 and between the second eccentric shaft 20d and the piston 13 can be sealed while the lubricating oil plays a role in lubrication, so that leakage of a compression working medium is reduced. The lubricating oil that has flowed to the end surfaces of the first eccentric shaft and the second eccentric shaft 20d facing away from the lubricating oil reservoir also flows to the end surfaces of both ends of the piston 13, and the possibility of leakage of the compression working medium from the end surfaces of the piston 13 can be further reduced.

Specifically, the compression mechanism unit 5 further includes an oil supply cylinder 21 for storing lubricating oil, and the oil supply cylinder 21 is connected to the auxiliary shaft 20e and communicates with the oil supply passage 20h. The lubricating oil in the oil supply cylinder 21 flows into the oil supply passage 20h, and then lubricates the outer peripheral surfaces of the main shaft 20a, the sub shaft 20e, the first eccentric shaft 20b, and the second eccentric shaft 20d through the first oil supply hole 20k, the second oil supply hole, and the oil supply groove 20g.

Referring to fig. 2, it can be understood that an air inlet hole 12b communicating with the compression cavity 12a is formed in the outer circumferential surface of the cylinder 12, a main exhaust hole 10a communicating with the compression cavity 12a is formed in one end of the main bearing 10 facing away from the cylinder 12, an auxiliary exhaust hole 15a communicating with the compression cavity 12a is formed in one end of the auxiliary bearing 15 facing away from the cylinder 12, the cylinder 12 further has a gas passage 12c penetrating through both side end surfaces thereof, and the auxiliary exhaust hole 15a communicates with the gas passage 12c.

And a low-pressure working medium is introduced into the compression cavity 12a through the air inlet hole 12b, and is compressed and pressurized into a high-pressure working medium after the eccentric rotation of the piston 13. One end of the main bearing 10, which is back to the cylinder 12, is provided with a main exhaust hole 10a communicated with the compression cavity 12a, one end of the auxiliary bearing 15, which is back to the cylinder 12, is provided with an auxiliary exhaust hole 15a communicated with the compression cavity 12a, and compressed high-pressure working medium is exhausted from the compression cavity 12a through the main exhaust hole 10a and the auxiliary exhaust hole 15 a. The rotary compressor 1 is vertically arranged, the main bearing 10 and the auxiliary bearing 15 are respectively located on the upper side and the lower side of the cylinder 12, the cylinder 12 is further provided with a gas channel 12c penetrating through end faces on two sides of the cylinder, the auxiliary exhaust hole 15a is communicated with the gas channel 12c, and a compressed working medium discharged from the auxiliary exhaust hole 15a flows to one side of the main bearing 10 through the gas channel 12c and is collected with the compressed working medium discharged from the main exhaust hole 10 a.

Correspondingly, in an embodiment, the housing 2 is provided with an air inlet 6 and an air outlet 3, and the air inlet 6 is communicated with the air inlet 12b. The compressed working medium channel enters the shell 2 through the air inlet 6 and then enters the compression cavity 12a through the air inlet 12b. The compressed working medium is discharged from the main exhaust hole 10a and the auxiliary exhaust hole 15a and then collected, and the collected working medium is discharged from the shell 2 through the gas outlet 3.

Referring to fig. 1, in an embodiment, the ends of the main bearing 10 and the secondary bearing 15 facing away from the cylinder 12 are respectively provided with a communication hole 10b for communicating with the gas passage 12c, the compression mechanism 5 further includes a main muffler 11 and a secondary muffler 16, the main muffler 11 is covered on the end of the main bearing 10 facing away from the cylinder 12, and the secondary muffler 16 is covered on the end of the secondary bearing 15 facing away from the cylinder 12; the main muffler 11 is provided with a muffler exhaust hole 11a communicating the main exhaust hole 10a and the communicating hole 10 b.

The main muffler 11 and the sub muffler 16 can perform the functions of noise reduction and noise reduction, and reduce the noise generated by the rotary compressor 1 when the working medium is compressed in the cylinder 12. Meanwhile, when the main muffler 11 is covered on the main bearing 10, a sealed space formed between the main muffler and the main bearing 10 can seal the main exhaust hole 10a and the communication hole 10b on the main bearing 10, so that the compressed working medium discharged from the main exhaust hole 10a and the communication hole 10b is collected and discharged through the muffler exhaust hole 11a. Similarly, when the auxiliary muffler 16 is covered on the auxiliary bearing 15, a sealed space formed between the auxiliary muffler 16 and the auxiliary bearing 15 can seal the auxiliary exhaust hole 15a and the communication hole 10b on the auxiliary bearing 15, so that the compressed working medium discharged from the auxiliary exhaust hole 15a is guided into the gas channel 12c through the communication hole 10b, is discharged into the sealed space formed between the main muffler 11 and the main bearing 10, and is collected with the compressed working medium discharged from the main exhaust hole 10 a.

With continued reference to fig. 1, in one embodiment, at least one balance weight 4c is disposed at an end of the rotor 4b, and the balance weight 4c is used for offsetting the eccentric load generated by the eccentric rotation of the first eccentric shaft 20b, the second eccentric shaft 20d and the piston 13.

Since the first eccentric shaft 20b and the second eccentric shaft 20d are eccentrically disposed with respect to the crankshaft body, when the first eccentric shaft 20b and the second eccentric shaft 20d drive the piston 13 to eccentrically rotate, the center of gravity of the crankshaft 20 is not on the axis of the crankshaft body and not on the central axis of the rotor 4b, which may cause the crankshaft 20 and the rotor 4b to shake, thereby causing the rotary compressor 1 to vibrate during operation. By arranging the balance blocks 4c at the end of the rotor 4b, specifically, the number of the balance blocks 4c may be one or more, and the balance blocks 4c are respectively arranged at two ends of the rotor 4 b. The eccentric load generated by the eccentric rotation of the first eccentric shaft 20b, the second eccentric shaft 20d, and the piston 13 is offset by the balance weight 4c, and the vibration generated when the rotary compressor 1 operates is alleviated.

The invention also provides a heat exchange circulating device.

Referring to fig. 1, in the present embodiment, the heat exchange cycle device includes a first heat exchanger 8, a throttling device 31, a second heat exchanger 9, and the rotary compressor 1 as described above, which are sequentially communicated to form a heat exchange loop. Since the heat exchange circulation device of the present invention adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.

Taking the circulating flow sequence of the refrigerant working medium according to the first heat exchanger 8, the throttling device 31, the second heat exchanger 9 and the rotary compressor 1 as an example, at this time, the first heat exchanger 8 may be regarded as a condenser, the second heat exchanger 9 may be regarded as an evaporator, an outlet of the second heat exchanger 9 is communicated with the air inlet 6 of the rotary compressor 1, and an inlet of the first heat exchanger 8 is communicated with the air outlet 3 of the rotary compressor 1. The low-pressure gaseous refrigerant is discharged into the rotary compressor 1 through the second heat exchanger 9, is compressed and increased by the rotary compressor 1, is converted into a high-pressure gaseous refrigerant, and is discharged into the first heat exchanger 8; the high-pressure gaseous refrigerant is released heat in the condenser and converted into a liquid working medium, and then the liquid working medium is discharged to the second heat exchanger 9 through the throttling device 31, and the liquid working medium is converted into a low-pressure gaseous refrigerant after absorbing heat in the second heat exchanger 9. Specifically, the throttling device 31 includes, but is not limited to, an expansion valve, etc.

In one embodiment, an accumulator 7 is connected between the second heat exchanger 9 and the rotary compressor 1. The liquid storage device 7 has the function of gas-liquid separation, and liquid working media are prevented from entering the rotary compressor 1, namely, the rotary compressor 1 is prevented from being damaged due to liquid impact. In the operation process of the heat exchange circulating device, due to the change of working conditions or when the heat exchange circulating device is adjusted, the refrigerant can flow back to the liquid storage device 7, so that the circulating amount of the refrigerant in the device is stabilized, and the heat exchange circulating device is in a normal operation state.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims

1. A rotary compressor, comprising:

a housing;

a motor disposed within the housing, the motor including a rotor;

2. The rotary compressor of claim 1, wherein the compression mechanism part further comprises a main bearing and a sub bearing which are respectively provided at both sides of the cylinder and seal the compression chamber; the part of the crankshaft body, which is positioned on one side of the first eccentric shaft, which is back to the second eccentric shaft, is a main shaft, the part of the crankshaft body, which is positioned on one side of the second eccentric shaft, which is back to the first eccentric shaft, is an auxiliary shaft, the main bearing is sleeved on the main shaft, and the auxiliary bearing is sleeved on the auxiliary shaft.

3. The rotary compressor of claim 2, wherein the crankshaft body is provided with an oil supply passage extending in an axial direction thereof, and the outer circumferential surfaces of the main shaft and the sub shaft are provided with first oil supply holes communicating with the oil supply passage.

4. The rotary compressor of claim 3, wherein a portion of the crankshaft body between the first eccentric shaft and the second eccentric shaft is an intermediate shaft, an outer circumferential surface of the intermediate shaft is provided with a second oil supply hole communicating with the oil supply passage, and outer circumferential surfaces of the first eccentric shaft and the second eccentric shaft are provided with oil supply grooves penetrating both side end surfaces thereof.

5. The rotary compressor of claim 2, wherein the cylinder has an air inlet hole formed in an outer circumferential surface thereof to communicate with the compression chamber, a main exhaust hole formed in an end of the main bearing facing away from the cylinder to communicate with the compression chamber, and an auxiliary exhaust hole formed in an end of the auxiliary bearing facing away from the cylinder to communicate with the compression chamber, the cylinder further having a gas passage formed therethrough at both side end surfaces thereof, the auxiliary exhaust hole being in communication with the gas passage.

6. The rotary compressor of claim 5, wherein the main bearing and the sub bearing are provided at ends thereof facing away from the cylinder with communication holes for communicating the gas passages, and the compression mechanism part further comprises a main muffler cover provided at an end of the main bearing facing away from the cylinder and a sub muffler cover provided at an end of the sub bearing facing away from the cylinder; and the main silencer is provided with a silencer exhaust hole communicated with the main exhaust hole and the communication hole.

7. The rotary compressor of claim 4, wherein the compression mechanism part further comprises an oil supply cylinder for storing lubricating oil, the oil supply cylinder being connected to the auxiliary shaft and communicating with the oil supply passage.

8. The rotary compressor of claim 5, wherein the housing is provided with an air inlet and an air outlet, the air inlet being communicated with the air inlet.

9. The rotary compressor of claim 1, wherein the end of the rotor is provided with at least one balance weight for offsetting eccentric loads generated by the first eccentric shaft, the second eccentric shaft and the eccentric rotation of the piston.

10. A heat exchange cycle apparatus comprising a first heat exchanger, a throttling means, a second heat exchanger and a rotary compressor according to claim 1, which are sequentially communicated to form a heat exchange circuit.