Compressor and refrigeration equipment

Abstract

The utility model relates to the technical field of compressors, and discloses a compressor which comprises a machine shell, a compressor body, a compressor core, a compressor core, a compressor core, a compressor core and a compressor core, the machine shell is provided with one or more stages of compression chambers, and accommodating spaces are formed in the compression chambers; the impeller assembly comprises one or more impellers, and the impellers are contained in the containing spaces of the compression chambers in a one-to-one correspondence mode; the central shaft is arranged on the compression chamber and the corresponding impeller hub in a penetrating mode, and the shaft ends of the two sides of the central shaft are fixed to the corresponding sides of the machine shell respectively; the motor assembly comprises a magnet and a stator winding; wherein the magnet is arranged on the inner circumferential wall of a shaft hole, sleeved with the center shaft, of the impeller hub, the stator winding is arranged on the outer circumferential wall of the center shaft, and the magnet and the stator winding are jointly matched to drive the impeller to rotate around the center rotating shaft. According to the embodiment of the utility model, the magnet and the stator winding are respectively arranged on the impeller and the central shaft, so that internal structural parts of the compressor are more compact, and the space utilization efficiency is improved. The invention further discloses the refrigeration equipment.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, for example, to a compressor and a refrigeration device. Background Art

[0002] The compressor is the core driving component of the existing refrigeration system. It is widely used in refrigerators, air conditioners and other refrigeration equipment. The working principle of the compressor is that it compresses the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure state by driving the piston, blades and other components in the cylinder, and then transports it to the circulation loop of the refrigeration system to participate in heat exchange. Conventional compressor types include piston compressors, screw compressors, centrifugal compressors and linear compressors.

[0003] Among them, for the centrifugal compressor type, its components mainly include impeller, center shaft, motor (stator winding and rotor), diffuser, etc. The impeller is fixed on the center shaft and the center shaft is connected to the stator winding and rotor drive of the motor. The diffuser is arranged on the outer peripheral side of the impeller, so that the motor can drive the impeller to rotate at high speed through the center shaft, accelerate the working fluid to be compressed and throw it into the diffuser, and then the high-speed working fluid is decelerated in the diffuser. According to Bernoulli's principle, dynamic pressure is converted into static pressure, and the kinetic energy of the working fluid is converted into pressure, thereby achieving an increase in the working fluid pressure.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] In the related art, the arrangement of the motor and the central shaft is mostly to arrange a stator winding with a cylindrical outer contour in the casing of the compressor, the rotor is coaxially sleeved in the stator, and one end of the central shaft extends into the center of the rotor and is relatively fixed. In the above arrangement, the volume of the stator winding and the rotor is large and will occupy more internal space of the casing, which also leads to a larger overall volume of the compressor, which cannot meet the design requirements of miniaturization of the compressor.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a compressor and a refrigeration device to solve the technical problem in the related art that the arrangement of the compressor motor and the central axis is large in size and occupies a lot of space.

[0009] According to an embodiment of the first aspect of the present application, a compressor is provided, comprising:

[0010] The casing has one or more compression chambers, each of which has a receiving space;

[0011] An impeller assembly includes one or more impellers, each impeller being received in a corresponding manner in the accommodation space of each compression chamber;

[0012] The central shaft is passed through the compression chamber and the corresponding impeller hub, and the shaft ends on both sides are fixed to the corresponding sides of the casing respectively; and,

[0013] The motor assembly includes a magnet and a stator winding; wherein the magnet is arranged on the inner peripheral wall of the shaft hole of the impeller hub on which the central axis is sleeved, and the stator winding is arranged on the outer peripheral wall of the central axis. The magnet and the stator winding cooperate together to drive the impeller to rotate around the central axis.

[0014] In this embodiment, the magnets and stator windings are respectively arranged on the impeller and the center shaft, and the two can cooperate to form a brushless motor drive form. Therefore, it is different from the conventional compressor in which additional space is reserved at the end of the center shaft to install the stator windings and the rotor. This makes the internal structural components of the compressor more compact and improves the space utilization efficiency.

[0015] In some optional embodiments, the magnets are evenly arranged along a first circumferential direction of the inner peripheral wall of the shaft hole; and / or the stator windings are evenly arranged along a second circumferential direction of the outer peripheral wall of the central shaft;

[0016] The first circumference and the second circumference are coaxial and located on the same radial plane.

[0017] In this embodiment, the magnets and stator windings are arranged on the impeller and the central axis respectively along two circumferences located in the same radial plane, which can ensure the uniformity and position consistency of the magnetic field coordination between the magnets and the stator windings, thereby improving the stability of the electromagnetically driven rotation of the impeller.

[0018] In some optional embodiments, the magnet is a permanent magnet in an annular shape, and the middle portion of the annular shape of the permanent magnet is configured as a through hole through which the central axis can pass; and / or,

[0019] The magnet comprises a plurality of arc-shaped permanent magnet blocks, which are arranged at intervals along a first circumferential direction and are jointly surrounded to form a through hole for the central axis to pass through.

[0020] In this embodiment, the magnet has various structural designs such as annular permanent magnets and arc-shaped permanent magnet blocks, all of which can meet the requirements of interaction and coordination with the magnetic field of the stator winding.

[0021] In some optional embodiments, the magnet is embedded on the inner peripheral wall of the shaft hole of the impeller hub; and / or,

[0022] The stator winding is embedded on the outer peripheral wall of the central shaft.

[0023] In this embodiment, the magnet is assembled with the impeller in an embedded manner, and the stator winding is also assembled with the central shaft in an embedded manner, so that the original volume space of the impeller and the central shaft can be used to install the motor assembly, reducing the internal space occupied by the compressor.

[0024] In some optional embodiments, a first embedding groove is provided on the inner peripheral wall of the shaft hole, and the groove depth of the first embedding groove is greater than or equal to the radial thickness of the magnet, so that the outer surface of the embedded magnet is not higher than the wall surface of the inner peripheral wall; and / or,

[0025] A second embedding groove is provided on the outer peripheral wall of the central shaft, and the groove depth of the second embedding groove is greater than or equal to the radial thickness of the stator winding, so that the outer surface of the embedded stator winding is not higher than the wall surface of the outer peripheral wall.

[0026] In this embodiment, the inner circumferential wall of the impeller shaft hole and the outer circumferential wall of the center shaft are the rotating surfaces that cooperate with each other. The magnet is installed in the first embedded groove of the impeller shaft hole and is not higher than its inner circumferential wall, and the stator winding is installed in the second embedded groove of the center shaft and is not higher than its outer circumferential wall. This can avoid the magnet and the stator winding protruding from the rotating surface and colliding with each other.

[0027] In some optional embodiments, the radial thickness h2 of the stator winding and the radius R of the central axis satisfy the relationship: h2≤R / 2.

[0028] In this embodiment, by limiting the radial thickness h2 of the stator winding, it can be ensured that the central axis can still have a high load-bearing capacity and structural strength after the second embedding slot is opened.

[0029] In some optional embodiments, the axial length of the stator winding is greater than or equal to the axial length of the magnet.

[0030] In this embodiment, in view of the possibility that the impeller may be axially offset due to the axial impact of the working fluid during rotation, the axial length of the stator winding is designed to be greater than or equal to the axial length of the magnet, so that the electromagnetic field coverage range of the stator winding can be larger than the magnetic field range of the magnet, thereby achieving a higher magnetic field force coordination when the magnet is offset with the impeller.

[0031] In some optional embodiments, the motor assembly further includes a power supply circuit electrically connected to the stator winding;

[0032] A wiring channel extending along the axial direction is constructed in the shaft body of the central shaft, and the power supply line is connected to the stator winding via the wiring channel.

[0033] In this embodiment, the power supply line is routed from the inside of the central shaft body, which can avoid the problem of the power supply line being entangled with the central shaft, impeller and other components.

[0034] In some optional embodiments, the compression chamber is constructed as a chamber having a symmetrical structure along a radial plane of the central axis; and,

[0035] The impeller comprises a first blade and a second blade, and the first blade and the second blade are symmetrically arranged along a radial plane in the compression chamber.

[0036] In this embodiment, the compression chamber and the impeller are designed to be symmetrical, which can not only increase the working fluid flow rate of a single impeller, but also effectively balance the axial forces on both sides of the impeller.

[0037] According to an embodiment of the second aspect of the present application, there is provided a refrigeration device, comprising a device body and a compressor as in any one of the embodiments of the first aspect described above.

[0038] The compressor body of the refrigeration device in the form of a compressor shown in the above embodiment can be designed to be smaller in size, thereby achieving the design requirement of miniaturization of the compressor and reducing the installation space occupied by the compressor in the refrigeration device.

[0039] The compressor and refrigeration equipment provided by the embodiments of the present disclosure can achieve the following technical effects:

[0040] The compressor provided in the embodiment of the present disclosure can achieve an integrated structural design of the magnet and impeller, and the stator winding and the center axis by changing the arrangement of the motor assembly relative to the impeller and the center axis, thereby eliminating the need to reserve other space inside the compressor to install the motor assembly, thereby greatly reducing the size of the compressor body.

[0041] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0043] Figure 1 is a partial cross-sectional schematic diagram of a compressor provided by an embodiment of the present disclosure;

[0044] Figure 2 is a schematic diagram of a casing of a compressor provided by an embodiment of the present disclosure;

[0045] Figure 3a is a three-dimensional schematic diagram of an impeller provided in one embodiment of the present disclosure;

[0046] Figure 3b is a partial cross-sectional view of an impeller provided by an embodiment of the present disclosure;

[0047] Figure 4 is a schematic diagram of the cooperation between a magnet and an impeller provided in one embodiment of the present disclosure;

[0048] Figure 4a yes Figure 4 A partial enlarged view of part A;

[0049] Figure 5 is a schematic diagram of the coordination between the stator winding and the central axis provided in one embodiment of the present disclosure;

[0050] Figure 5a yes Figure 4 A partial enlarged view of part B in FIG.

[0051] Figure 6a yes Figure 1 A partial enlarged view of part C in FIG.

[0052] Figure 6b yes Figure 1 A partial enlarged view of the D part in FIG.

[0053] Figure 7 It is a schematic diagram of the external unit of a refrigeration device (air conditioner) provided in one embodiment of the present disclosure.

[0054] Reference numerals:

[0055] 1. Compressor;

[0056] 10. Casing; 110. Air intake passage; 120. Compression chamber; 121. First-stage compression chamber; 122. Second-stage compression chamber; 130. Intermediate air passage; 131. Volute chamber; 140. Exhaust passage;

[0057] 20, impeller; 210, first impeller; 220, second impeller; 231, wheel cover; 232, guide vane; 233, wheel disc; 241, impeller air inlet; 242, impeller air outlet; 250, wheel hub; 251, shaft hole; 252, first embedded groove;

[0058] 30. Central axis; 31. Second embedding groove;

[0059] 40. Motor assembly; 41. Magnet; 42. Stator winding;

[0060] 51. Bearing parts; 52. Sealing parts;

[0061] 2. Refrigeration equipment; 21. Equipment body. DETAILED DESCRIPTION

[0062] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0063] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0064] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0065] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0066] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0067] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0068] The present application discloses a compressor 1, which can be applied to a refrigeration system or refrigeration equipment, and can be specifically used as a working fluid compression and pumping component of the refrigeration system, so as to realize the function of compressing a low-temperature and low-pressure working fluid into a high-temperature and high-pressure working fluid and transporting it to the system circulation loop for heat exchange. Optionally, the types of the refrigeration system or refrigeration equipment include but are not limited to air conditioners, refrigerators, freezers, etc. At the same time, for a refrigeration equipment form with multiple compressors 1, the compressor 1 disclosed in the present application can be one or more of them.

[0069] Combination Figures 1 to 6b As shown, the embodiment of the present disclosure provides a compressor 1, which at least includes a casing 10, an impeller assembly, a central shaft 30 and a motor assembly 40. Among them, the casing 10 serves as the outer shell component of the compressor 1, and an inner shell space is formed therein for accommodating components such as the impeller assembly and the central shaft 30, and can protect and seal these components, wherein a compression chamber is specifically constructed in the casing 10. The impeller assembly is arranged in the compression chamber in the casing 10, and it can rotate continuously in the compression chamber to do work on the working fluid, thereby increasing the temperature and pressure of the working fluid. The central shaft 30 serves as a supporting component and an axis retaining component of the impeller assembly, so that the impeller assembly can rotate around the central shaft 30 in the compression chamber for a long time. The motor assembly 40 is a driving device for the impeller assembly, which cooperates with the impeller assembly and provides a driving force for the impeller assembly to rotate.

[0070] Different from the separate structure of the motor assembly 40, the central shaft 30 and the impeller assembly in the prior art, and the coordination mode in which the motor assembly 40 indirectly drives the impeller assembly to operate through the central shaft 30 as a transmission member, the compressor 1 of this embodiment integrates the motor assembly 40 with the impeller assembly and the central shaft 30, so that the motor assembly 40 is partially integrated with the impeller assembly and partially integrated with the central shaft 30. Therefore, there is no need to reserve space inside the compressor 1 to install the motor assembly 40, thereby achieving a reduction in the size of the compressor 1.

[0071] In some optional embodiments, the casing 10 of the compressor 1 includes an air intake passage 110, a compression chamber 120, an intermediate air passage 130, an air exhaust passage 140, and the like.

[0072] In an embodiment, the suction channel 110 is used as a path for introducing the working medium to be compressed from the outside into the compression chamber 120. Figure 1 and 2As shown, the air intake channel 110 is constructed as a pipe structure extending from the outside of the casing 10 to the inside of the casing 10, and has a first air intake port connected to the outside of the casing 10 and a second air intake port connected to the compression chamber. Among them, the first air intake port may be provided with a pipe joint to be connected to the working medium delivery pipeline of the refrigeration system through the pipe joint. Another option, the air intake channel 110 may specifically include an air intake chamber and an air intake pipe. Among them, the air intake pipe is located upstream of the flow path of the air intake chamber, and the working medium to be compressed flows into the air intake chamber from the air intake pipe, and then is transported from the air intake chamber to the compression chamber for compression. In an embodiment, the chamber cross-sectional area of ​​the air intake chamber is larger than the pipe cross-sectional area of ​​the air intake pipe, so that the working medium flow rate can be slowed down after the working medium flows in, so that the working medium is mixed and flows into the compression chamber more evenly, reducing the air flow disturbance and separation loss of the working medium.

[0073] And, in the embodiment, the compression chamber 120 is a chamber used to accommodate the impeller assembly and for the impeller assembly to rotate. Here, a receiving space is formed in the compression chamber, and the impeller assembly is received in the compression space; wherein the inner contour of the receiving space is adapted to the outer contour of the impeller assembly and the space size of the receiving space is slightly larger than the outer contour of the impeller assembly, so that there is an axial and circumferential movable gap between the two for the impeller assembly to rotate. Figure 2 As shown, one axial side of the compression chamber 120 is connected to the suction channel 110, and the working medium to be compressed flows into the compression chamber 120 from the axial direction of the compression chamber.

[0074] Optionally, the number of compression chambers 120 of the compressor 1 is one or more stages. Figure 2 In the embodiment shown, there are two levels of compression chamber 120, wherein the compression chamber close to the intake channel 110 (upstream of the compression path) is the first-stage compression chamber 121 (or the first-stage compression chamber), and the compression chamber far away from the intake channel 110 is the second-stage compression chamber 122 (or the final-stage compression chamber). The working fluid successively enters the first-stage compression chamber 121 and the second-stage compression chamber 122 and undergoes two compressions, so that the working fluid can reach a higher temperature and pressure, thereby improving the heat exchange efficiency.

[0075] Here, in the case where the compression chambers 120 are multi-stage, the compression chambers 120 are arranged at intervals along the same axial direction, and the axial direction is consistent with the length direction of the casing 10, so that the compression chambers 120 can be arranged relatively evenly in the casing 10 of the compressor 1, thereby improving the space utilization rate. In addition, an impeller assembly is respectively provided in each compression chamber, so that the impeller assembly is used to compress the working medium in each corresponding compression chamber 120.

[0076] In the embodiment, the intermediate air duct 130 includes a diffuser, a bend, a reflow device, etc. The intermediate air duct 130 is mainly used as a path to connect two adjacent compression chambers 120, or to connect the final compression chamber and the exhaust channel 140. Among them, the diffuser is mainly used to reduce the speed and diffuse the working fluid output from the compression chamber 120, the bend is mainly used to change the working fluid in the diffuser from the centrifugal direction to the centripetal direction, and the reflow device is mainly used to transport the working fluid in the intermediate air duct 130 to the next stage compression chamber 120. Alternatively, the intermediate air duct 130 also includes a volute 131, which is used to collect the working fluid, guide the flow direction of the working fluid, and further diffuse the pressure.

[0077] In an embodiment, the exhaust passage 140 is used as a path for discharging the compressed working medium from the compression chamber. Figure 1 and 2 As shown, the exhaust passage 140 is constructed as a pipeline structure extending from the compression chamber 120 to the outside of the casing 10, and has a first exhaust port connected to the final compression chamber and a second exhaust port connected to the outside. Similarly, the second exhaust port can also be provided with a pipe joint to connect with the working medium delivery pipeline of the refrigeration system by using the pipe joint.

[0078] In some optional embodiments, the impeller assembly includes one or more impellers 20. Here, the number of impellers 20 corresponds to the number of compression chambers 120 of the compressor 1. Figure 1 The number of compression chambers 120 shown in the embodiment is 2, so the impeller assembly includes 2 impellers in total, and each impeller is accommodated in the accommodation space of the corresponding compression chamber one by one. It should be understood that Figure 1 The two-stage compression chamber 120 and two impellers shown are only for exemplary purposes. The technical solution of the present application can also be applied to the type of compressor 1 with more than two stages of compression chambers. Therefore, the present application does not limit the number of compression chambers 120 and corresponding impellers.

[0079] For the convenience of explaining the technical solution, the impeller disposed in the first-stage compression chamber 121 is defined as the first impeller 210, and the impeller disposed in the second-stage compression chamber 122 is defined as the second impeller 220. The first impeller 210 is coaxially disposed with the first-stage compression chamber 121, the second impeller 220 is coaxially disposed with the second compression chamber, and the axes of the first impeller 210 and the second impeller 220 are colinear, so that the first impeller 210 and the second impeller 220 can be assembled on the same central axis 30 and rotate around the same axis, thereby ensuring the stability of the compressor operation.

[0080] Optionally, the impeller 20 used in the embodiment of the present disclosure may be any one of a closed impeller, a semi-open impeller, and an open impeller. Figure 3a and 3b The impeller type used in the illustrated embodiment is a closed impeller.

[0081] Specifically, if Figure 3a and 3b As shown, the impeller 20 of the embodiment of the present disclosure includes a wheel cover 231, a guide vane 232 and a wheel disc 233. The wheel cover 231 is arranged on the outer peripheral side of the wheel disc 233, and the two are arranged at an interval, so as to form a working medium passage by utilizing the interval space between the wheel cover 231 and the wheel disc 233. Here, an impeller air inlet 241 is provided on the axial end of the impeller, and an impeller air outlet 242 is evenly provided on the outer peripheral side of the impeller 20. The impeller air inlet 241 and the impeller air outlet 242 are respectively connected to the working medium passage, so that the working medium can flow into the working medium passage from the impeller air inlet 241, and be thrown out from the impeller air outlet 242 along the radial direction of the impeller under the centrifugal force generated by the rotation of the impeller 20. Furthermore, the guide vanes 232 are arranged in the space formed by the wheel cover 231 and the wheel disc 233, wherein the number of the guide vanes 232 is multiple, the multiple guide vanes 232 are arranged at intervals along the circumference of the impeller, and each guide vane 232 extends from the impeller air inlet 241 to the impeller air outlet 242, so that blade grooves can be constructed between adjacent guide vanes 232, and the blade grooves can play a role in guiding the flow direction of the working medium.

[0082] In some optional embodiments, the compression chamber 120 is configured as a chamber having a symmetrical structure along a radial plane of the central axis 30. Figure 1 As shown, the space contours of the compression chamber 120 on both sides of the radial plane are respectively in the shape of a cone, and the size of the space on each side is the same. Also, the impeller 20 disposed in the compression chamber 120 includes a first blade and a second blade, and the two blades 20 are also symmetrically arranged in the compression chamber 120 along the radial plane, wherein the first blade is located in the space of the compression chamber 120 on one side of the radial plane, and the second blade is located in the space of the compression chamber 120 on the other side of the radial plane, and the first blade and the second blade each have a separate impeller air inlet 241 and an impeller air outlet 242, and the impeller air outlets 242 of the two blades face opposite directions.

[0083] Optionally, in this embodiment, the first blade and the second blade are an integrated structure, thereby improving the overall structural strength of the impeller 20 and reducing the number of gaps inside the impeller 20.

[0084] By designing the compression chamber 120 and the internal impeller 20 to be symmetrical, this embodiment can utilize the two blades of the impeller 20 to absorb the working fluid separately for work, thereby increasing the working fluid flow rate in the compression chamber 120 and improving the compression efficiency; at the same time, since the two blades of the impeller 20 are oriented away from each other, the axial forces exerted on the two blades are also oriented towards each other, so that the two can offset each other, thereby making the operation of the impeller 20 more stable and balanced.

[0085] In some optional embodiments, such as Figure 6a As shown, a bearing member 51 is provided between the compression chamber 120 and the axial end of the impeller 20. The outer ring of the bearing member 51 matches with the cavity wall of the compression chamber 120, and the inner ring matches with the wheel cover 231 of the impeller, so that the bearing member 51 can effectively reduce the friction loss between the impeller 20 and the cavity wall of the compression chamber 120 during the rotation process, thereby extending the service life of the impeller 20. Optionally, the bearing member 51 is in the form of an annular bearing.

[0086] In yet another optional embodiment, Figure 6a As shown, a seal 52 is provided between the compression chamber 120 and the axial end of the impeller 20. The outer ring of the seal 52 matches with the cavity wall of the compression chamber 20, and the inner ring matches with the wheel cover 231 of the impeller. The seal 52 can block the gap between the compression chamber 120 and the impeller 20 to reduce the amount of working fluid flowing into the gap. Optionally, the seal 52 is an annular labyrinth seal.

[0087] In an embodiment, Figure 3b and Figure 4 As shown, the wheel disc 233 also has a hub 250 extending along its axis, and the hub 250 is formed with an axial hole 251 formed along the axis of the impeller 20 , and the axial hole 251 can be used to cooperate with the central shaft 30 of the compressor 1 .

[0088] In some embodiments, the central shaft 30 is in the shape of a long axis, and is disposed on the hub 250 of the compression chamber and its corresponding impeller along the axis of the compression chamber 120. Here, the two side ends of the central shaft 30 are respectively fixed to the corresponding sides of the compressor 1 casing 10, so when the compressor 1 is working, the central shaft 30 itself does not rotate, and the impeller rotates relative to the central shaft 30.

[0089] Optionally, at least one side of the shaft end corresponding to the central axis 30 of the casing 10 of the compressor 1 is formed with a fixing groove concavely along the axis, and the corresponding shaft end of the central axis 30 extends into the fixing groove and is fixed. Optionally, the central axis 30 and the fixing groove can be assembled in the form of keyway fixing, sleeve fixing, thread fixing, etc., and the present application does not limit this. Another option is that at least one side of the shaft end corresponding to the central axis 30 of the casing 10 of the compressor 1 is formed with a fixing channel penetrating along the axis, and the corresponding shaft end of the central axis 30 extends into the fixing channel and is fixed. Similarly, the central axis 30 and the fixing channel can also be assembled in the form of keyway fixing, sleeve fixing, thread fixing, etc. In this way, this embodiment can limit the movement of the central axis 30 in the axial and circumferential directions through the above-mentioned fixing forms.

[0090] In some optional embodiments, the motor assembly 40 includes a magnet 41 and a stator winding 42. Figure 4As shown, the magnet 41 is fixed to the inner peripheral wall of the shaft hole 251 of the impeller hub 250, so that the magnetic field of the magnet 41 can at least cover at least a portion of the outer peripheral wall of the central axis 30 passing through the shaft hole 251; and Figure 5 As shown, the stator winding 42 is arranged on the outer peripheral wall of the central axis 30, so that the electromagnetic field of the stator winding 42 can at least cover at least part of the inner peripheral wall of the shaft hole 251 of the impeller 20. In this way, after the stator winding 42 is energized, the magnet 41 and the stator winding 42 can form a magnetic field force cooperation, thereby driving the impeller 20 to rotate around the central axis 30.

[0091] In the embodiment, the magnet 41 and the stator winding 42 are respectively arranged on the impeller 20 and the center shaft 30, thereby forming a brushless motor drive combination, which can not only drive the impeller 20 to rotate, but also because the magnet 41 and the stator winding 42 are respectively integrated on the impeller 20 and the center shaft 30, it is possible to save the internal space of the compressor 1 and improve its space utilization efficiency.

[0092] In some embodiments, in order to make the magnetic field distribution of the magnet 41 and the stator winding 42 more balanced and the impeller rotation more stable, the magnet 41 in this embodiment is evenly arranged along the first circumferential direction of the inner circumferential wall of the shaft hole 251, so that the magnetic field of the magnet 41 can be distributed along the circumferential range of the impeller 20; and / or, the stator winding 42 is also evenly arranged along the second circumferential direction of the outer circumferential wall of the central axis 30, so that the electromagnetic field of the stator winding 42 can also be distributed along the circumferential range of the central axis 30. In this way, the magnet 41 and the stator winding 42 can form a magnetic field match in the circumferential direction. In this embodiment, the first circumference is located on the outer ring side of the second circumference, and the first circumference and the second circumference are coaxially arranged, and the first circumference and the second circumference are located on the same radial plane, so that the positions of the magnetic field centers of the magnet 41 and the stator winding 42 correspond to each other.

[0093] Optionally, the radial plane where the first circumference and the second circumference are located is the same plane as the radial plane in which the compression chamber 120 and the impeller 20 are symmetrically arranged as mentioned above. In this way, the magnetic field center of the magnet 41 and the stator winding 42 can also be located in the cavity center of the compression chamber 120, further improving the smoothness of the rotation of the impeller 20 and effectively reducing the occurrence of cavity deviation of the impeller 20 relative to the compression chamber 120.

[0094] Optionally, the magnet 41 is a permanent magnet, which can keep its magnetism and magnetic field polarity unchanged for a long time to meet the long-term use requirements of the compressor 1.

[0095] In some embodiments, the magnet 41 is a permanent magnet in an annular shape, and the middle part of the annular permanent magnet is configured as a through hole for the central shaft 30 to pass through, so that the magnet 41 can be fixed with the central shaft 30 by sleeve arrangement. Optionally, the permanent magnet is composed of two semicircular arc-shaped magnetic blocks spliced ​​together.

[0096] In some other embodiments, the magnet 41 includes a plurality of arc-shaped permanent magnet blocks, which are arranged at intervals along the first circumferential direction and are jointly arranged to form a through hole for the central axis 30 to pass through. In this way, the plurality of permanent magnet blocks are fixed to the central axis 30 in a semi-circumferential manner. Optionally, the number of the permanent magnet blocks can be 3, 4, 6, etc. The magnetic field strength, polarity orientation, etc. of the plurality of permanent magnet blocks are substantially the same.

[0097] In a plurality of optional embodiments, the magnet 41 is fixed on the inner circumferential wall of the shaft hole 251 of the impeller hub 250 in an inner nesting manner.

[0098] Specifically, taking the magnet 41 shown in the previous text as an annular permanent magnet as an example, a first embedded groove 252 is formed on the inner circumferential wall of the corresponding shaft hole 251 along the first circumferential direction, and the axial length D1 of the first embedded groove 252 is equal to or slightly greater than the axial length d1 of the magnet 41, and the groove depth H1 of the first embedded groove 252 is greater than or equal to the axial thickness h1 of the magnet 41. Figure 4a As shown, the outer surface of the embedded magnet 41 (the side facing the central axis 30) is not higher than the inner wall surface, so as to avoid the magnet 41 from forming a protrusion on the inner wall of the shaft hole 251. This can reduce the collision between the magnet 41 and the central axis 30 and reduce the minimum fitting clearance between the impeller shaft hole 251 and the central axis 30.

[0099] Optionally, the first embedding groove 252 and the magnet 41 form an interference fit, so as to achieve a tight connection between the magnet 41 and the first embedding groove 252 by means of interference fit. Alternatively, the first embedding groove 252 and the magnet 41 are fixed by bonding, which has a low difficulty in bonding process and does not require additional spare parts, and can achieve three-sided bonding of the magnet 41 and the first embedding groove 252 by bonding, with high connection strength.

[0100] Similarly, in some embodiments, Figure 5 As shown, the stator winding 42 is also fixed on the outer peripheral wall of the central shaft 30 in an inner nested manner.

[0101] Specifically, a second embedded groove 31 is formed on the outer peripheral wall of the central shaft 30 inwardly along the second circumferential direction, and the axial length D2 of the second embedded groove 31 is equal to or slightly greater than the axial length d2 of the stator winding 42, and the groove depth H2 of the second embedded groove 31 is greater than or equal to the radial thickness h2 of the stator winding 42. Figure 5aAs shown, the outer surface of the stator winding 42 embedded in the second slot 31 (the side facing the impeller 20) is not higher than the outer peripheral wall of the center shaft 30, which can also reduce the collision with the impeller 20 and reduce the matching clearance between the impeller and the center shaft 30.

[0102] In some embodiments, the second embedding slot 31 and the stator winding 42 form an interference fit, so as to achieve a fastened connection between the stator winding 42 and the second embedding slot 31 by means of interference fit. Alternatively, the second embedding slot 31 and the stator winding 42 are fixed by means of bonding, which has a low difficulty in the bonding process and does not require additional parts, and can achieve three-sided bonding of the stator winding 42 and the second embedding slot 31 by bonding, with high connection strength.

[0103] In some other optional embodiments, Figure 6b As shown, the axial length d2 of the stator winding 42 is greater than or equal to the axial length d1 of the magnet 41 .

[0104] In this embodiment, in view of the possibility that the impeller 20 may be axially offset due to the axial impact of the working fluid during rotation, the axial length of the stator winding 42 is designed to be greater than or equal to the axial length of the magnet 41, so that the electromagnetic field coverage range of the stator winding 42 can be larger than the magnetic field range of the magnet 41, thereby achieving a higher magnetic field force coordination when the magnet 41 is offset with the impeller.

[0105] In the embedded form of the stator winding 42 shown in the above embodiment, in order to reduce the adverse effect of the second embedded slot 31 on the strength of the central axis 30 itself, the radial thickness h2 of the stator winding 42 and the radius R of the central axis 30 satisfy the relationship: h2≤R / 2. Optionally, in some embodiments, the radial thickness h2 of the stator winding 42 is R / 2, R / 4, and so on.

[0106] In this embodiment, by limiting the radial thickness h2 of the stator winding 42 to the above value, the central shaft 30 can still have a high load-bearing capacity and structural strength after the second embedding slot 31 is provided.

[0107] In some embodiments not shown in the drawings, the motor assembly 40 further includes a power supply line electrically connected to the stator winding 42, and the power supply line is used to transmit an electrical signal to the stator winding 42, so as to be used to control the start and stop state of the electromagnetic field of the stator winding 42. At the same time, a wiring channel extending along the axial direction is configured in the shaft body of the central shaft 30, and the power supply line is connected to the stator winding 42 via the wiring channel.

[0108] Here, the wiring channel extends axially from one of the axial ends of the central axis 30 to the position corresponding to the second embedded slot 31, and includes a first wiring segment and a second wiring segment. The first wiring segment is the channel portion of the wiring channel extending axially along the central axis 30, and the second wiring segment is the channel portion of the wiring channel extending radially along the central axis 30 and penetrating from the first wiring segment to the bottom of the second embedded slot 31. In this way, the power supply line can be connected to the stator winding 42 in the second embedded slot 31 through the first wiring segment and the second wiring segment of the wiring channel.

[0109] In this embodiment, the power supply line is routed from the inside of the central shaft 30 , which can avoid the problem of the power supply line being entangled with the central shaft 30 , the impeller and other components.

[0110] In some further optional embodiments, the present application further provides a refrigeration device 2, which includes a device body 21 and the compressor 1 shown in the above embodiment.

[0111] Optionally, the type of the refrigeration equipment 2 includes but is not limited to an air conditioner, a refrigerator, a freezer, etc. Figure 7 The refrigeration device 2 shown is an air conditioner, and the compressor 1 is installed in the outdoor unit of the air conditioner.

[0112] The refrigeration equipment provided by the embodiment of the present disclosure does not require additional space for installing the motor assembly in the compressor body, so its body can be designed to be smaller in size, thereby achieving the design requirement of miniaturization of the compressor and reducing the space occupied by the compressor in the installation space of the refrigeration equipment. As shown in the figure, the space occupied by the outdoor unit of the air conditioner can be reduced.

[0113] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A compressor, characterized in that: include: The casing has one or more compression chambers, each of which has a receiving space; An impeller assembly includes one or more impellers, each impeller being received in a corresponding manner in the accommodation space of each compression chamber; The central shaft is passed through the compression chamber and the corresponding impeller hub, and the shaft ends on both sides are fixed to the corresponding sides of the casing respectively; and, The motor assembly includes a magnet and a stator winding; wherein the magnet is arranged on the inner peripheral wall of the shaft hole of the impeller hub on which the central axis is sleeved, and the stator winding is arranged on the outer peripheral wall of the central axis. The magnet and the stator winding cooperate together to drive the impeller to rotate around the central axis.

2. The compressor according to claim 1, characterized in that The magnets are evenly arranged along a first circumferential direction of the inner peripheral wall of the shaft hole; and / or the stator windings are evenly arranged along a second circumferential direction of the outer peripheral wall of the central axis; The first circumference and the second circumference are coaxial and located on the same radial plane.

3. The compressor according to claim 2, characterized in that The magnet is a ring-shaped permanent magnet, and the middle part of the ring-shaped permanent magnet is constructed as a through hole for the central axis to pass through; and / or, The magnet comprises a plurality of arc-shaped permanent magnet blocks, which are arranged at intervals along a first circumferential direction and are jointly surrounded to form a through hole for the central axis to pass through.

4. The compressor according to any one of claims 1 to 3, characterized in that: The magnet is embedded in the inner peripheral wall of the shaft hole of the impeller hub; and / or, The stator winding is embedded on the outer peripheral wall of the central shaft.

5. The compressor according to claim 4, characterized in that A first embedding groove is provided on the inner peripheral wall of the shaft hole, and the groove depth of the first embedding groove is greater than or equal to the radial thickness of the magnet, so that the outer surface of the embedded magnet is not higher than the wall surface of the inner peripheral wall; and / or, A second embedding groove is provided on the outer peripheral wall of the central shaft, and the groove depth of the second embedding groove is greater than or equal to the radial thickness of the stator winding, so that the outer surface of the embedded stator winding is not higher than the wall surface of the outer peripheral wall.

6. The compressor according to claim 5, characterized in that The radial thickness h2 of the stator winding and the radius R of the central axis satisfy the relationship: h2≤R / 2.

7. The compressor according to claim 1, characterized in that The axial length of the stator winding is greater than or equal to the axial length of the magnet.

8. The compressor according to claim 1, characterized in that The motor assembly also includes a power supply circuit electrically connected to the stator winding; A wiring channel extending along the axial direction is constructed in the shaft body of the central shaft, and the power supply line is connected to the stator winding via the wiring channel.

9. The compressor according to claim 1, characterized in that The compression chamber is constructed as a chamber with a symmetrical structure along a radial plane of the central axis; and The impeller comprises a first blade and a second blade, and the first blade and the second blade are symmetrically arranged along a radial plane in the compression chamber.

10. A refrigeration device, characterized in that: It comprises a device body, and a compressor as described in any one of claims 1 to 9.

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