Compressor

Abstract

A compressor, comprising a housing, a drive electric motor and a balance block (100), wherein the balance block (100) comprises a main body portion (11); the main body portion (11) is provided with a recess (c) offset from the center of the main body portion; the size of the recess (c) is less than or equal to 2 / 3 times that of the balance block (100), so that the center of gravity of the balance block (100) deviates from the geometric center thereof; a centrifugal force is provided in the radial direction of a balance crankshaft; and the main body portion (11) is provided with a central through hole (a) allowing the crankshaft to pass through, and a first flow through hole (b) located on the peripheral side of the central through hole (a) and in communication with a second flow through hole (e) on a rotor (1). The shape and surface area distribution of the balance block (100) are continuous and uniform, and a fluid can smoothly bypass the balance block (100), so as to reduce local flow velocity changes and pressure fluctuations, thereby mitigating the problem of disturbing a flow field, reducing air resistance, and ensuring oil circuit circulation inside the compressor (300).

Description

Compressor

[0001] Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202411062851.9, filed on August 2, 2024, and Chinese Patent Application No. 202421872983.3, filed on August 2, 2024, with the Chinese Patent Office, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of compressors, in particular to a compressor. BACKGROUND

[0004] In a rotary compressor, the motor rotor is connected to the crankshaft to drive the crankshaft to rotate. Due to the rolling piston and the gas force, there is a centrifugal force in the radial direction of the crankshaft during operation. A balance block is usually added on both sides of the rotor end surface to offset the centrifugal force.

[0005] The existing balance block is usually crescent-shaped and is installed on the rotor end surface at a position offset from the center. When the compressor is working, the motor rotor rotates at high speed. At this time, the high-speed gas-liquid mixture discharged from the muffler will be disturbed by the balance block when reaching the rotor flow-through hole, which will destroy the gas flow field at this place, causing the gas to disperse around, affecting the return of the upper separated liquid refrigerant oil to the oil pool, and further affecting the normal oil circulation, lubrication and sealing effect of the compressor. The flow field is disturbed by the balance block, the flow resistance increases, the exhaust kinetic energy loss increases, and the efficiency of the compressor is affected. SUMMARY

[0006] The main purpose of the present application is to provide a compressor, which aims to solve the problem that the existing balance block easily destroys the gas flow field, increases the exhaust kinetic energy loss, and affects the efficiency of the compressor.

[0007] To achieve the above-mentioned purpose, the compressor provided by the present application comprises:

[0008] a housing;

[0009] a driving motor arranged in the housing, comprising a rotor, a second flow-through hole being arranged through the rotor; and

[0010] a balance block, the balance block comprising a main body portion, the main body portion having a first end surface and a second end surface arranged oppositely, the first end surface being arranged on a lower end of the rotor, the main body portion being provided with a central through hole for the crankshaft to pass through, and a first flow-through hole being arranged on a side of the central through hole and being arranged in communication with the second flow-through hole, the first flow-through hole being arranged through the two end surfaces of the main body portion;

[0011] The main body part is provided with a groove, the groove is arranged away from the center of the main body part, the volume of the groove is V1, the volume of the balance block is V, V1≤2 / 3V.

[0012] In an embodiment, V1≤1 / 3V.

[0013] In an embodiment, the length of the groove in the circumferential direction of the main body part is L1, the circumference of the main body part is L, L1≤1 / 2L.

[0014] In an embodiment, the groove depth of the groove is H1, the thickness of the balance block is H, H1≤1 / 2H.

[0015] In an embodiment, the groove depth of the groove is H1, the wall thickness of the bottom wall of the groove is t, 2mm≤t≤H1.

[0016] In an embodiment, the groove is recessed in the first end face of the main body part.

[0017] In an embodiment, a plurality of first through-flow holes are provided, and at least one first through-flow hole is arranged on the groove bottom.

[0018] In an embodiment, the balance block further comprises an annular protrusion protruding from the second end face, and the annular protrusion is arranged around the periphery of the center through-hole and the first through-flow hole.

[0019] In an embodiment, the outer circumferential surface of the annular protrusion is flush with the outer circumferential surface of the main body part; or,

[0020] The outer diameter of the annular protrusion is smaller than the diameter of the main body part.

[0021] In an embodiment, the height of the annular protrusion is h, 1mm≤h≤20mm; and / or,

[0022] The ring width of the annular protrusion is D, 1mm≤D≤10mm.

[0023] In an embodiment, the inner circumferential wall of the annular protrusion is tapered away from the main body part.

[0024] In an embodiment, the main body part and the annular protrusion are integrally formed; or,

[0025] The main body part and the annular protrusion are detachably connected.

[0026] In an embodiment, the cross section of the first through-flow hole is circular, elliptical or polygonal.

[0027] In an embodiment, the main body part is further provided with a first connecting hole corresponding to a second connecting hole on the rotor.

[0028] In an embodiment, the annular protrusion is provided with an avoiding groove extending along the up-down direction, the avoiding groove penetrating the annular protrusion;

[0029] The first connecting hole corresponds to the avoiding groove.

[0030] In an embodiment, the compressor further comprises a muffler below the rotor assembly, the top of the muffler is provided with an exhaust port in communication with the gas outlet of the compression cylinder, the exhaust port is arranged towards the first through-flow hole;

[0031] The distance between the bottom of the balance block and the top of the muffler is L, the thickness of the balance block is H, and H≤1 / 2L.

[0032] In an embodiment, the cross-sectional area of the first through-flow hole is greater than or equal to the cross-sectional area of the second through-flow hole; and / or,

[0033] The rotor is provided with a shaft hole for the crankshaft to penetrate, the area of the center through-hole is greater than or equal to the area of the shaft hole.

[0034] In an embodiment, the compressor comprises a carbon dioxide compressor. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0036] FIG. 1 is a cross-sectional schematic view of a compressor in the related art;

[0037] FIG. 2 is a cross-sectional schematic view of the rotor and the balance block in FIG. 1;

[0038] FIG. 3 is a cross-sectional schematic view of an embodiment of the compressor provided by the present application;

[0039] FIG. 4 is a cross-sectional schematic view of the rotor and the balance block in FIG. 3;

[0040] FIG. 5 is a cross-sectional schematic view of an embodiment of the balance block provided by the present application;

[0041] FIG. 6 is a perspective view of the rotor in FIG. 3;

[0042] Fig. 7 is a structural schematic diagram of an embodiment of the balance block provided in the present application;

[0043] Fig. 8 is a structural schematic diagram of another view of the balance block in Fig. 7.

[0044] Explanation of reference numerals:

[0045] 100', balance block; 1', rotor;

[0046] 100, balance block; 11, main body part; 101, first end face; 102, second end face; 12, annular protrusion; a, central via hole; b, first through-flow hole; c, groove; d, first connecting hole;

[0047] 200, driving motor; 1, rotor; e, second through-flow; f, shaft hole; k, second connecting hole;

[0048] 300, compressor; 2, housing; 3, muffler; g, exhaust port.

[0049] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. Embodiment of the present application

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0051] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0052] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope claimed by the present application.

[0053] In the rotary compressor, the motor rotor is connected with the crankshaft to drive the rotation of the crankshaft. Due to the influence of the rolling piston and the gas force, the centrifugal force exists in the radial direction of the crankshaft during operation. Usually, a balance block is added on both sides of the end face of the rotor to offset the centrifugal force. The existing balance block is usually crescent-shaped and is installed on the end face of the rotor at a position deviating from the center. When the compressor is working, the motor rotor rotates at high speed. At this time, the high-speed gas-liquid mixture discharged from the muffler will be disturbed by the balance block when reaching the rotor flow hole, which will destroy the gas flow field at this place, make the gas disperse around, affect the return of the upper separated liquid refrigerant oil to the oil pool, and further affect the normal oil circulation, and also affect the lubrication and sealing effect of the compressor. The balance block disturbs the flow field, the flow resistance increases, the exhaust kinetic energy loss increases, and the compressor efficiency is affected.

[0054] The present application provides a kind of compressor, to solve the problem of existing balance block easily destroying gas flow field, exhaust kinetic energy loss increases, affects the efficiency of compressor.

[0055] Please refer to FIG. 3 to FIG. 6, in an embodiment of the present application, the compressor 300 comprises a housing 2, a driving motor 200 and a balance block 100, the driving motor 200 is arranged in the housing 2, the driving motor 200 comprises a rotor 1 arranged in rotation along an up-down extending rotation axis, the rotor 1 is provided with a second through-flow hole e, the center of gravity of the balance block 100 is arranged to deviate from the geometric center, the balance block 100 comprises a main body part 11, the main body part 11 has a first end surface 101 and a second end surface 102 arranged oppositely, the first end surface 101 is installed at the lower end of the rotor 1, the main body part 11 is provided with a central through-hole a for the crankshaft to pass through, and a first through-flow hole b arranged at the side of the central through-hole a and communicated with the second through-flow hole e, the first through-flow hole b penetrates through the two end surfaces of the main body part 11; the main body part 11 is provided with a recess c, the recess c is arranged to deviate from the center of the main body part 11, the volume of the recess c is V1, the volume of the balance block 100 is V, V1≤2 / 3V.

[0056] Please refer to FIG. 1 and FIG. 2, in the related art, the balance block 100' is composed of a crescent shape or a single-sided balance + a reverse buckle disc, which is not symmetrical about the rotation center of the rotor, the surface area of the crescent-shaped balance block is not uniformly distributed relative to the surrounding fluid during rotation, which can cause changes in local flow rate and pressure fluctuations, thereby generating a disturbed flow field, such disturbance increases the fluid dynamics loss, reduces the efficiency, and causes additional noise and vibration.

[0057] At the same time, the high-pressure gas-liquid mixture is discharged from the muffler, passes through the through-flow hole on the rotor, and enters the upper space of the stator; due to the existing balance block structure rotating at high speed with the rotor, the gas-liquid mixture is impacted during this process, changing its original path, so that part of the gas-liquid mixture is dispersed around, destroying the internal flow process and lubricating oil circulation path of the compressor.

[0058] The normal circulation path of lubricating oil: the lubricating oil in the oil pool enters the pump body compression chamber from the oil supply hole at the bottom of the crankshaft to participate in the lubrication and sealing of the operating parts, part of the lubricating oil will enter the compression chamber in the compression pump and be discharged with high-pressure gas through the muffler 3; at this time, the gas-liquid mixture passes through the through-flow hole of the rotor 1 and enters the upper space of the stator assembly; under the action of gravity separation, centrifugal separation, impact separation, etc., the separated lubricating oil droplets are separated out; the separated lubricating oil returns to the oil pool at the bottom of the compressor from the clearance between the stator and the housing, participates in the subsequent oil supply, and thus completes the internal lubricating oil circulation process of the compressor.

[0059] The volume V1 of the groove c is set to be less than or equal to 2 / 3 of the volume of the balance block 100, so that the mass on one side of the groove c is smaller, and the center of gravity of the balance block 100 is offset.

[0060] The volume V of the balance block 100 refers to the size of the space occupied by the shape of the balance block 100. When the balance block 100 has a hollow structure such as a hole and a groove inside, the volume of the balance block 100 includes the volume occupied by the hollow structure such as the hole and the groove.

[0061] In the technical solution of the present application, the balance block 100 is installed at the bottom of the rotor 1, and the center of gravity of the balance block 100 is offset from its geometric center. During the operation of the rolling piston and the gas force, the balance block 100 can balance the centrifugal force in the radial direction of the crankshaft. The balance block 100 includes a main body 11, a central through hole a for the crankshaft, and a first through hole b corresponding to the second through hole e on the rotor 1. The first through hole b is arranged on the side of the central through hole a and penetrates through the two end faces of the main body 11. After the oil-gas mixture flows out of the first through hole b of the rotor 1, it will enter the second through hole e. The main body 11 is symmetrical about the central through hole a. When the rotor 1 drives the balance block 100 to rotate, because the shape and surface area distribution of the balance block 100 are continuous and uniform, the fluid can smoothly bypass the balance block 100, reducing local flow velocity variation and pressure fluctuation, thereby improving the problem of disturbed flow field, reducing wind resistance, ensuring the circulation of the oil circuit inside the compressor 300, ensuring the lubricating oil required for lubrication and sealing of the compressor 300, improving the reliability and service life of the compressor 300, and reducing the loss caused by disturbance to the gas-liquid mixture, thereby improving the efficiency of the compressor 300. To solve the problem that the existing balance block 100 easily destroys the gas flow field, the kinetic energy loss of exhaust gas increases, and the efficiency of the compressor 300 is affected.

[0062] Further, in an embodiment, V1≤1 / 3V, the volume V1 of the groove c is set to be less than or equal to 1 / 3 of the volume of the balance block 100, so as to avoid setting the groove c too large, so that the mass of the balance block 100 itself is reduced too much, and it is difficult to achieve the purpose of obviously adjusting the center of gravity of the balance block 100.

[0063] Of course, in addition to the above-mentioned form of restricting the volume of the groove c to be less than or equal to 1 / 3 of the volume of the balance block 100, in the present embodiment, the length of the groove c in the circumferential direction of the main body 11 is L1, and the circumference of the main body 11 is L, L1≤1 / 2L. Also, the offset of the center of gravity can be better achieved, and the purpose of counterweight can be better achieved.

[0064] In the embodiment, the groove c has a groove depth H1, and the balance block 100 has a thickness H, and H1≤1 / 2H. In this way, the shift of the gravity center can be better achieved, and the counterweight purpose can be better achieved.

[0065] Further, the bottom wall of the groove c has a wall thickness t, and 2mm≤t≤H1. The wall thickness of the bottom wall of the groove c is set to be greater than or equal to 2mm, so that the bottom of the groove c can have sufficient strength. Meanwhile, the wall thickness of the bottom wall of the groove c is set to be less than or equal to the groove depth of the groove c, so that the shift of the gravity center can be better achieved, and the counterweight purpose can be better achieved.

[0066] Further, in the embodiment, the groove c is recessed in the first end surface 101 of the main body part 11. Since the groove c is arranged away from the muffler 3, the bottom of the main body part 11 is relatively flat, and the balance block 100 can avoid disturbing the flow field.

[0067] Further, in the embodiment, the first flow-through hole b is provided in plurality, and the groove bottom of the groove c is provided with at least one first flow-through hole b.

[0068] It should be noted that the plurality of first flow-through holes b need to be connected with the plurality of second flow-through holes e on the rotor 1. Therefore, the manufacturing precision of the plurality of first flow-through holes b and the plurality of second flow-through holes e needs to be strictly controlled, so as to avoid misalignment and increase of flow resistance.

[0069] If the balance groove avoids all the first flow-through holes b, each first flow-through hole b needs to be precisely connected with the second flow-through hole e on the rotor 1. The high-speed gas-liquid mixture located in the groove c and passing through the first flow-through hole b can be diverted at the groove c. The groove c can have the function of diversion. In this way, whether the first flow-through hole b at the groove bottom can be precisely connected with the second flow-through hole e on the rotor 1 or not, the balance groove can be used to realize the connection between each other.

[0070] The high-speed gas-liquid mixture discharged from the muffler 3 is sprayed towards the bottom of the balance block 100. However, when the balance block 100 rotates, the exhaust hole on the muffler 3 for discharging the high-speed gas-liquid mixture cannot be aligned with the first flow-through hole b at all times. The high-speed gas-liquid mixture will impact on the bottom of the main body part 11, so that a small part of the high-speed gas-liquid mixture is dispersed in all directions.

[0071] Of course, in addition to the way of setting the groove c to achieve the offset of the center of gravity, it can also be achieved by setting the counterweight hollow part, such as opening a through hole, or setting the aperture of part of the first through hole b in the first through hole b to be larger, of course, the form of realizing the offset of the center of gravity is not limited to the above examples, and other changes can be made by those skilled in the art under the inspiration of the technical essence of the embodiments of the present application, but as long as the functions and effects achieved are the same or similar to the embodiments of the present application, they should be covered within the protection scope of the embodiments of the present application.

[0072] Further, in order to make the high-speed gas-liquid mixture more concentrated, please refer to Figure 7, in the embodiment, the balance block 100 further comprises an annular protrusion 12 protruding from the second end surface 102, the annular protrusion 12 is annularly arranged around the center via hole a and the first through hole b.

[0073] By setting the annular protrusion 12, the gas-liquid mixture can be guided to flow along the preset path, avoiding disordered diffusion of the gas-liquid mixture, ensuring that most of the mixture can accurately pass through the first through hole b, instead of splashing everywhere or generating unnecessary turbulence. Moreover, the setting of the annular protrusion 12 can improve the efficiency of the gas-liquid mixture entering the through hole, reduce the backflow of the gas-liquid mixture at the bottom of the rotor 1, reduce the hydrodynamic loss, and thus improve the overall efficiency of the compressor 300.

[0074] Further, in the embodiment, the outer circumferential surface of the annular protrusion 12 is arranged in a circular ring shape. In this way, the surface of the annular protrusion 12 provides a more uniform peripheral profile, and the annular protrusion 12 has a more consistent effect on the fluid when rotating, and the fluid can flow more smoothly around the balance block 100.

[0075] Further, in an embodiment, the outer circumferential surface of the annular protrusion 12 is flush with the outer circumferential surface of the main body part 11. In this way, the annular protrusion 12 can have a larger inner diameter and outer diameter, and can maximize the range of gathering high-speed gas-liquid mixture.

[0076] In another embodiment, the outer diameter of the annular protrusion 12 is smaller than the diameter of the main body part 11, so that the diameter of the annular protrusion 12 is smaller, and the material required for manufacturing the annular protrusion 12 is also less, which can reduce the cost to a certain extent.

[0077] Further, in the embodiment, the height of the annular protrusion 12 is h, and 1mm≤h≤10mm; and / or, the ring width of the annular protrusion 12 is D, and 1mm≤D≤10mm.

[0078] Exemplarily, the height of the annular protrusion 12 is set between 3mm and 5mm, neither occupying too much space below the rotor 1, nor being able to play a role of gathering, reducing the backflow of the gas-liquid mixture at the bottom of the rotor 1.

[0079] The ring width of the annular protrusion 12 can be uniformly set, or non-uniformly set, i.e. one part is thinner, and the other part is thicker. The inner circumferential wall of the annular protrusion 12 can be annular circumference, or be set in a stepped manner, of course, other possible shapes can also be set, which can be determined according to actual conditions, and the embodiments of the present application do not limit this. Therefore, the ring width of the annular protrusion 12 can be set in the range of 1mm to 10mm, and exemplarily, the ring width of the annular protrusion 12 is set between 2mm and 5mm.

[0080] Further, referring to FIG. 5, in another embodiment, the inner circumferential wall of the annular protrusion 12 is set to be gradually expanded in the direction away from the main body part 11. In this way, when the balance block 100 is formed, it is beneficial to the mold stripping. Specifically, the included angle α between the inner circumferential wall of the annular protrusion 12 and the main body part 11 is 0°≤α≤10°, and exemplarily, it can be set to be 3° to 5°.

[0081] In an embodiment, the main body part 11 and the annular protrusion 12 are integrally formed. In this way, the balance block 100 has higher structural strength and rigidity, and under the condition of high-speed rotation, the stability of the balance block 100 as a whole is better, and deformation or damage is less likely to occur. And it can guarantee the accurate geometric relationship between the main body part 11 and the annular protrusion 12, avoid the cumulative error that may occur in the assembly process, reduce the maintenance workload and potential assembly errors, and reduce the production cost, because the number of parts and assembly steps are reduced.

[0082] In another embodiment, the main body part 11 and the annular protrusion 12 are detachably connected. The detachable design allows to replace the annular protrusion 12 of different specifications to adapt to different working conditions, without the need to replace the entire balance block 100, thereby reducing the maintenance cost.

[0083] The detachable manner can be to set a clamping structure, a screwing structure or an adhesive layer between the main body part 11 and the annular protrusion 12, of course, other possible connection forms can also be set, which can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0084] Specifically, in the present embodiment, the cross section of the first through-flow hole b is set to be circular, elliptical or polygonal. The polygonal shape can be square, trapezoidal or triangular, etc.

[0085] When a plurality of first through holes b are provided, the cross section of each of the plurality of first through holes b can be provided in the same shape, of course, part of the cross section of the first through hole b can be provided in the same shape, and another part of the cross section of the first through hole b can be provided in another shape, and the shape and size of the first through hole b can be adjusted to finally make the center of gravity of the balance block 100 deviate from the geometric center thereof.

[0086] Further, referring to FIG. 6, in order to facilitate the fixation of the balance block 100 and the rotor 1, the main body part 11 is further provided with a first connecting hole d corresponding to a second connecting hole k provided on the rotor 1. The balance block 100 is connected through a connecting piece penetrating the first connecting hole d and the second connecting hole k.

[0087] The balance block 100 and the rotor 1 can be fixed by screwing, or can be fixed by riveting, of course, other possible connection modes can also be provided, and the specific mode can be determined according to the actual situation, and the embodiments of the present application do not limit this.

[0088] Specifically, in the present embodiment, the annular protrusion 12 is provided with an avoiding groove j extending in the up-down direction, the avoiding groove j penetrates the annular protrusion 12, and the first connecting hole d corresponds to the avoiding groove j. The avoiding groove j avoids interference between the annular protrusion 12 and the connecting piece (such as a bolt) on the rotor 1, ensuring that the connecting piece can smoothly pass through the first connecting hole d and align with the second connecting hole h of the rotor 1 and be fixed, thereby realizing reliable connection of the balance block 100 and the rotor 1.

[0089] Specifically, in the present embodiment, the compressor 300 further comprises a silencer 3, the silencer 3 is located below the driving motor 200, the top of the silencer 3 is provided with an exhaust port g which is in communication with the gas outlet of the compression cylinder, and the exhaust port g is arranged towards the first through hole b. In this way, the high-speed gas-liquid mixture discharged in the compression cavity is silenced by the silencer 3, discharged from the exhaust port g, and sprayed towards the first through hole b. Since the exhaust port g is directed towards the inner periphery of the annular protrusion 12, the gas-liquid mixture flows along the preset path, avoiding disordered diffusion of the gas-liquid mixture, and ensuring that most of the mixture can accurately pass through the first through hole b, rather than splashing everywhere or producing unnecessary turbulence.

[0090] Specifically, in the present embodiment, the distance between the bottom of the balance block 100 and the top of the silencer 3 is L, and the thickness of the balance block 100 is H, H≤1 / 2L.

[0091] The thickness of the balance block 100 is set to be less than or equal to 1 / 2L. On the one hand, the centrifugal force can be balanced and the cost is considered. On the other hand, the thickness of the balance block 100 is not set too thick, which increases the resistance of fluid flow, causes turbulent flow and pressure loss, and thus affects the efficiency and performance of the compressor 300. The high-speed ejected gas-liquid mixture may directly impact the bottom of the balance block 100, causing strong mechanical impact and vibration, which not only accelerates the wear of the balance block 100, but also may adversely affect the balance state of the rotor 1, increasing the vibration and noise of the rotor 1.

[0092] In the present embodiment, the cross-sectional area of the first through hole b is set to be greater than or equal to the cross-sectional area of the second through hole e. In this way, during the rising of the oil-gas mixture, the oil-gas mixture passing through the second through hole e is not interfered by the bottom wall of the balance block 100, and the oil-gas mixture in the second through hole e can smoothly flow into the first through hole b.

[0093] In the present embodiment, the rotor 1 is provided with a shaft hole f for the crankshaft to pass through, and the area of the center through hole a is set to be greater than or equal to the area of the shaft hole f.

[0094] In this way, during the rising of the oil-gas mixture from the shaft hole f, the oil-gas mixture in the shaft hole f is not interfered by the bottom wall of the balance block 100, and the oil-gas mixture in the shaft hole f can smoothly flow into the center through hole a.

[0095] Specifically, the compressor 300 includes a carbon dioxide compressor, which is a special compressor using carbon dioxide as a working medium, and is usually used in a refrigeration system called "carbon dioxide transcritical cycle". It has no destructive effect on the ozone layer, and in some application scenarios, the carbon dioxide system can achieve higher energy efficiency than traditional refrigeration systems.

[0096] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A compressor, wherein, The compressor comprises: a housing; a driving motor arranged in the housing and comprising a rotor, the rotor being provided with a second through-flow hole; a balance block, the balance block comprising a main body portion having a first end face and a second end face arranged oppositely, the first end face being arranged at a lower end of the rotor, the main body portion being provided with a central through hole for the crankshaft to pass through, and a first through-flow hole arranged at a side of the central through hole and communicated with the second through-flow hole, the first through-flow hole penetrating through the two end faces of the main body portion; the main body portion is provided with a recess, the recess being arranged away from the center of the main body portion, a volume of the recess being V1, a volume of the balance block being V, V1≤2 / 3V.

2. The compressor of claim 1, wherein, V1≤1 / 3V.

3. The compressor of claim 1 or 2, wherein, a length of the recess in a circumferential direction of the main body portion is L1, a circumference of the main body portion is L, L1≤1 / 2L.

4. The compressor of any one of claims 1 to 3, wherein, a groove depth of the recess is H1, a thickness of the balance block is H, H1≤1 / 2H.

5. The compressor of any one of claims 1 to 4, wherein, a groove depth of the recess is H1, a wall thickness of a bottom wall of the recess is t, 2mm≤t≤H1.

6. The compressor of any one of claims 1 to 5, wherein, the recess is arranged in the first end face of the main body portion.

7. The compressor of any one of claims 1 to 6, wherein, a plurality of the first through-flow holes are arranged in the recess.

8. The compressor of any one of claims 1 to 7, wherein, the balance block further comprises an annular protruding portion protruding from the second end face, the annular protruding portion being arranged at a periphery of the central through hole and the first through-flow hole.

9. The compressor of claim 8, wherein, an outer circumferential surface of the annular protruding portion is flush with an outer circumferential surface of the main body portion; or an outer diameter of the annular protruding portion is smaller than a diameter of the main body portion.

10. The compressor of claim 8 or 9, wherein, a height of the annular protruding portion is h, 1mm≤h≤10mm; and / or a ring width of the annular protruding portion is D, 1mm≤D≤10mm.

11. The compressor of any one of claims 8 to 10, wherein, an inner circumferential wall of the annular protruding portion is arranged in a gradually expanding manner away from the main body portion.

12. The compressor of any one of claims 8 to 11, wherein, the main body portion and the annular protruding portion are arranged in an integral manner; or the main body portion and the annular protruding portion are arranged in a detachable manner.

13. The compressor of any one of claims 1 to 12, wherein, a cross section of the first through-flow hole is arranged in a circular, elliptical or polygonal shape.

14. The compressor of any one of claims 1 to 13, wherein, the main body portion is further provided with a first connecting hole corresponding to a second connecting hole on the rotor.

15. The compressor of claim 14, wherein, the annular protruding portion is provided with an avoiding groove extending in an up-down direction, the avoiding groove penetrating through the annular protruding portion; the first connecting hole corresponds to the avoiding groove.

16. The compressor of any one of claims 1 to 15, wherein, the compressor further comprises a silencer arranged below the driving motor, a top portion of the silencer being provided with an exhaust port communicated with an exhaust port of the compression cylinder, the exhaust port being arranged towards the first through-flow hole; a distance between a bottom portion of the balance block and a top portion of the silencer is L, a thickness of the balance block is H, H≤1 / 2L.

17. The compressor of any one of claims 1 to 16, wherein, a cross section area of the first through-flow hole is arranged to be greater than or equal to a cross section area of the second through-flow hole; and / or the rotor is provided with a shaft hole for the crankshaft to pass through, an area of the central through hole is arranged to be greater than or equal to an area of the shaft hole.

18. The compressor of any one of claims 1 to 17, wherein, the compressor comprises a carbon dioxide compressor.

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