Linear compressor

Abstract

The application provides a linear compressor, and relates to the field of compressors.The linear compressor comprises a shell and a compressor core, the compressor core is arranged in the shell, the compressor core comprises at least two linear motor assemblies which are coaxial and sequentially connected in head-to-tail mode, the back pressure cavity of the linear motor assembly at the head is communicated with the air inlet, the exhaust cavity of the linear motor assembly at the tail is communicated with the air outlet, the back pressure cavities and the exhaust cavities of adjacent linear motor assemblies are communicated, and the momentum sum of the compressor core is zero.The linear compressor provided by the application can realize one-stage compression by arranging multiple linear motor assemblies in series in the shell, so that the compression ratio is improved, the back pressure cavities and the exhaust cavities of adjacent linear motor assemblies can share one cavity, so that the volume of the linear compressor is reduced, the momentum sum of all the linear motor assemblies in the shell is zero, mechanical vibration is reduced, and noise is lowered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a linear compressor. BACKGROUND

[0002] The conventional rotary compressor converts the rotary motion of the motor rotor into the reciprocating linear motion of the piston through the crank connecting rod mechanism after starting, which has low mechanical efficiency, large noise and vibration. The linear compressor uses linear motor to drive the piston to do reciprocating linear motion without intermediate conversion mechanism, which has high mechanical efficiency, small noise and vibration, and good starting performance, and thus is widely used.

[0003] The linear compressor is generally single motor single stage compression structure, and the single piston is prone to cause large vibration and noise during the movement. In order to reduce the vibration and noise of the linear compressor, the structure of the opposed pair of motors is used to offset the vibration generated by the moving parts. However, when the linear compressor with the opposed pair of motors is used to improve the compression ratio, the system is complex and the volume is too large. SUMMARY

[0004] The present application provides a linear compressor to solve the problem of how to reduce mechanical vibration and noise while improving the compression ratio and reducing the volume of the compressor in the prior art. The linear motor assembly in series is arranged in the shell, the number of linear motor assemblies in series is increased to improve the compression ratio, the exhaust cavity and the back pressure cavity of adjacent linear motor assemblies share one chamber to reduce the occupied space, and the vibration and noise are reduced by making the momentum sum of all linear motor assemblies zero.

[0005] The present application provides a linear compressor, comprising:

[0006] A shell, the shell comprising an air inlet and an air outlet;

[0007] A compressor core, the compressor core being arranged in the shell, the compressor core comprising at least two linear motor assemblies, the linear motor assemblies being sequentially connected in series on the same axis, each of the linear motor assemblies comprising a back pressure cavity and an exhaust cavity, the back pressure cavity of the first linear motor assembly being connected with the air inlet, and the exhaust cavity of the last linear motor assembly being connected with the air outlet,

[0008] Wherein, the momentum sum of all the linear motor assemblies of the compressor core is zero.

[0009] According to the linear compressor provided by the present application, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 360 degrees / N, wherein N represents the number of linear motor assemblies, and N is an odd number greater than 1.

[0010] According to the linear compressor provided by the application, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 360 degrees / N, N represents the number of the linear motor assemblies, and N is an even number greater than or equal to 2,

[0011] Alternatively, when the number of the linear motor assemblies is an even number greater than or equal to 2, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 180 degrees.

[0012] According to the linear compressor provided by the application, the linear motor assembly comprises a stator unit, a mover unit and a support unit, the mover unit is connected with the support unit, and the stator unit can drive the mover unit and the support unit to reciprocate after being electrified.

[0013] The stator unit comprises a coil and a magnetically conductive silicon steel sheet, and the magnetically conductive silicon steel sheet is arranged on the outer wall of the coil.

[0014] According to the linear compressor provided by the application, the mover unit comprises a permanent magnet, a piston and a connecting framework, the connecting framework connects the permanent magnet and the piston, the permanent magnet is opposite to the coil, and the coil drives the permanent magnet to move linearly,

[0015] The connecting framework is connected with the support unit.

[0016] According to the linear compressor provided by the application, the linear motor assembly further comprises an inner frame body, the inner frame body separates the back pressure cavity and the exhaust cavity of the linear motor assembly,

[0017] The inner frame body is provided with a movement channel, the movement channel separates the piston and the permanent magnet, the piston moves linearly in the movement channel, and the permanent magnet is arranged outside the movement channel.

[0018] According to the linear compressor provided by the application, the inner frame body is provided with an air floating channel, the air floating channel comprises an air floating inlet and an air floating outlet, the air floating inlet is communicated with the exhaust cavity, and the air floating outlet is communicated at the gap between the piston and the movement channel in the circumferential direction.

[0019] According to the linear compressor provided by the application, the piston is provided with an air suction channel, one end of the air suction channel is provided with a first one-way valve, and a compression cavity is formed between the first one-way valve and the inner frame body,

[0020] In the open state of the first one-way valve, the air suction channel communicates the compression cavity and the back pressure cavity.

[0021] The linear compressor provided by the application has an exhaust passage formed in the inner frame body, and the exhaust passage is provided with a second one-way valve,

[0022] In the open state of the second one-way valve, the compression cavity is communicated with the exhaust cavity.

[0023] The linear compressor provided by the application further comprises a heat exchanger and a cooler, wherein the heat exchanger is arranged at the gas inlet of the back pressure cavity, and the cooler is arranged at the second one-way valve of the exhaust cavity.

[0024] The linear compressor provided by the application has the advantages that by arranging a plurality of linear motor assemblies in series in the shell, one level of compression is realized for each added linear motor assembly, so that the compression ratio is efficiently improved, and the back pressure cavities and the exhaust cavities of adjacent linear motor assemblies can share one cavity, so that the volume of the linear compressor is reduced, the momentum of all the linear motor assemblies in the shell is zero, mechanical vibration is reduced, and noise is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0026] Figure 1 is one of the linear compressor structure schematic diagrams provided by the application;

[0027] Figure 2 is the second linear compressor structure schematic diagram provided by the application.

[0028] Reference signs:

[0029] 100: shell; 101: gas inlet; 102: gas outlet;

[0030] 103: cooler; 104: heat exchanger; 200: compressor core;

[0031] 201: linear motor assembly; 202: back pressure cavity; 203: exhaust cavity;

[0032] 210: first linear motor assembly; 211: first back pressure cavity; 212: first exhaust cavity;

[0033] 220: second linear motor assembly; 221: second back pressure cavity; 222: second exhaust cavity;

[0034] 230: stator unit; 231: magnetic conductive silicon steel sheet; 232: coil;

[0035] 240: mover unit; 241: piston; 242: permanent magnet;

[0036] 243: connecting framework; 250: support unit; 260: inner frame body;

[0037] 261: movement channel; 262: second one-way valve; 244: suction channel;

[0038] 245: first one-way valve; 270: compression cavity; 271: first compression cavity;

[0039] 272: second compression cavity; 300: air floating channel; 301: air floating air inlet;

[0040] 302: air floating air outlet. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0042] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0045] The embodiments of the present application are described below in conjunction with Figures 1 to 2 The embodiments of the present application are described below in conjunction with

[0046] The present application provides a linear compressor, comprising: a shell 100 and a compressor core 200 placed in the shell 100, wherein:

[0047] As shown in Figure 1 The shell 100, the shell 100 includes an air inlet 101 and an air outlet 102; the compressor core 200 is placed in the shell 100, the compressor core 200 includes at least two coaxial linear motor assemblies 201, all linear motor assemblies 201 are sequentially communicated from head to tail, that is, the linear motor assemblies 201 are connected in series, each linear motor assembly 201 includes a back pressure cavity 202 and an exhaust cavity 203, the back pressure cavity 202 of the head linear motor assembly 201 is communicated with the air inlet 101, the exhaust cavity 203 of the tail linear motor assembly 201 is communicated with the air outlet 102, that is, in the adjacent linear motor assemblies 201, the exhaust cavity 203 of the linear motor assembly 201 closest to the air inlet 101 is communicated with the back pressure cavity 202 of the linear motor assembly 201 closest to the air outlet 102, wherein the momentum sum of all linear motor assemblies 201 of the compressor core 200 is zero.

[0048] Specifically, the linear compressor comprises an air inlet 101, which can be provided with a one-way valve to allow gas to enter the shell 100 but not to exit from the air inlet 101. After entering the air inlet 101, the gas is first compressed by the first linear motor assembly 201, then compressed again by the middle linear motor assembly 201, and finally compressed by the tail linear motor assembly 201. The gas is compressed several times by the several linear motor assemblies 201, thereby improving the compression ratio of the linear compressor. After being finally compressed by the tail linear motor assembly 201, the gas is discharged from the air outlet 102. The air outlet 102 can be provided with a one-way valve to allow gas to exit the shell 100 but not to enter from the air outlet 102.

[0049] Further, each linear motor assembly 201 comprises a back pressure cavity 202 and an exhaust cavity 203 during the compression of air. The exhaust cavity 203 of one linear motor assembly 201 is communicated with the back pressure cavity 202 of another adjacent linear motor assembly 201, and the plurality of linear motor assemblies 201 are sequentially communicated. The linear motor assembly 201 close to the air inlet 101 is the first linear motor assembly 201, and the back pressure cavity 202 of the first linear motor assembly 201 is communicated with the air inlet 101. The linear motor assembly 201 close to the air outlet 102 is the tail linear motor assembly 201, and the exhaust cavity 203 of the tail linear motor assembly 201 is communicated with the air outlet 102. Thus, the series structure of all linear motor assemblies 201 of the compressor core 200 is formed.

[0050] The reciprocating motion of the linear motor assembly 201 during the compression of air will cause vibration of the moving parts. By controlling the current amplitude and phase of each linear motor assembly 201, the momentum sum of the moving parts of all linear motor assemblies 201, i.e. the momentum sum of the mover units, is zero. Thus, the vibration between the linear motor assemblies 201 is offset.

[0051] In an optional embodiment of the present application, the current frequency of each linear motor assembly 201 is equal, and the phase difference of the currents of adjacent linear motor assemblies 201 is 360 degrees / N, wherein N represents the number of linear motor assemblies 201, for the momentum sum of all linear motor assemblies 201 of the compressor core 200 to be zero.

[0052] That is, in order to achieve the momentum of the linear motor assemblies 201 in the shell 100 being zero, when the number of the linear motor assemblies 201 in the shell 100 is even, the frequencies of the linear motor assemblies 201 are equal, and the phase difference of the currents of the adjacent linear motor assemblies 201 can be 360 degrees / N, N represents the number of the linear motor assemblies 201, and N is an even number greater than or equal to 2. Alternatively, the phase difference of the currents of the adjacent linear motor assemblies 201 is 180 degrees. For example, the shell 100 includes four linear motor assemblies 201, four-stage compression is performed on the air, the frequencies of the four linear motor assemblies 201 are equal, and the phase difference of the adjacent linear motor assemblies 201 can be 180 degrees or 90 degrees.

[0053] When the number of the linear motor assemblies 201 in the shell 100 is odd, the frequencies of the linear motor assemblies 201 are equal, and the phase difference of the currents of the adjacent linear motor assemblies 201 can be 360 degrees / N, N represents the number of the linear motor assemblies 201, and N is an odd number greater than 1. For example, the shell 100 includes three linear motor assemblies 201, three-stage compression is performed on the air, the frequencies of the three linear motor assemblies 201 are equal, and the phase difference of the adjacent linear motor assemblies 201 can be 120 degrees.

[0054] As shown in FIG. 1, in an embodiment of the present application, the compressor core 200 includes a first linear motor assembly 210 and a second linear motor assembly 220. The first linear motor assembly 210 includes a first back pressure cavity 211 and a first exhaust cavity 212, and the second linear motor assembly 220 includes a second back pressure cavity 221 and a second exhaust cavity 222. The first back pressure cavity 211 is in communication with the air inlet 101, the second exhaust cavity 222 is in communication with the air outlet 102, and the first exhaust cavity 212 and the second back pressure cavity 221 are through. Figure 2 As shown in FIG. 1, in an embodiment of the present application, the compressor core 200 includes a first linear motor assembly 210 and a second linear motor assembly 220. The first linear motor assembly 210 includes a first back pressure cavity 211 and a first exhaust cavity 212, and the second linear motor assembly 220 includes a second back pressure cavity 221 and a second exhaust cavity 222. The first back pressure cavity 211 is in communication with the air inlet 101, the second exhaust cavity 222 is in communication with the air outlet 102, and the first exhaust cavity 212 and the second back pressure cavity 221 are through.

[0055] In addition, in an embodiment of the present application, the first back pressure cavity 211 of the first linear motor assembly 210 and the second exhaust cavity 222 of the second linear motor assembly 220 can share one cavity, that is, the first back pressure cavity 211 of the first linear motor assembly 210 is the second exhaust cavity 222 of the second linear motor assembly 220. In the process of multi-stage compression, the internal structure of the compressor core 200 is simplified, and the volume of the linear compressor is reduced.

[0056] The current frequency of the first linear motor assembly 210 is equal to the current frequency of the second linear motor assembly 220, and the current phase difference is 180 degrees. In the current phase of the present application, the moving parts of the first linear motor assembly 210 and the moving parts of the second linear motor assembly 220 are opposite in direction at the same time, so as to realize the vibration of the two moving parts to offset each other. The current refers to the current of the coil.

[0057] With reference to the above Figure 1 and Figure 2 In an optional embodiment of the present application, the linear motor assembly 201 includes a stator unit 230, a mover unit 240 and a support unit 250, the mover unit 240 is connected with the support unit 250, and the stator unit 230 can drive the mover unit 240 and the support unit 250 to reciprocate after being powered.

[0058] In the present embodiment, the support unit 250 can be a leaf spring support or an air floating support, which provides spring stiffness and reduces the drift of the mover unit 240. The stator unit 230 is fixedly connected in the housing 100, and the mover unit 240 and the support unit 250 reciprocate under the action of the stator unit 230. The current frequency and the current phase difference in the above embodiment are the current frequency and the current phase difference of the stator unit 230. The current frequency and the current phase of the stator unit 230 determine the motion state of the mover unit 240.

[0059] Further, in other embodiments of the present application, the stator unit 230 includes a coil 232 and a magnetically conductive silicon steel sheet 231, and the magnetically conductive silicon steel sheet 231 is arranged on the outer wall of the coil 232.

[0060] In addition, in other optional embodiments of the present application, the mover unit 240 includes a permanent magnet 242, a piston 241 and a connecting framework 243, the connecting framework 243 connects the permanent magnet 242 and the piston 241, the permanent magnet 242 is opposite to the coil 232, and the coil 232 drives the permanent magnet 242 to move linearly, wherein the connecting framework 243 is connected with the support unit 250.

[0061] Specifically, a set of stator units 230 is arranged on each side of the mover unit 240. The coils 232 of the stator units 230 are supplied with alternating current, and the coils 232 interact with the permanent magnets 242 to drive the permanent magnets 242 to reciprocate. The permanent magnets 242 are connected to the piston 241 and the support unit 250 through the connecting frame 243, and drive the piston 241 to reciprocate. The piston 241 compresses air to form a compression chamber 270 and a back pressure chamber. The reciprocating motion of the piston 241 generates pressure waves in the compression chamber 270, thereby converting electrical energy into mechanical energy. For example, the mover unit 240 includes one piston 241 and two permanent magnets 242, the two permanent magnets 242 interact with two coils 232 respectively, and the two permanent magnets 242 are connected to one piston 241 through the connecting frame 243, and the two sets of permanent magnets 242 and coils 232 drive one piston 241 to reciprocate together.

[0062] With reference to the foregoing description Figure 1 In optional embodiments of the present application, the linear motor assembly 201 further includes an inner frame 260, which separates the back pressure chamber 202 and the exhaust chamber 203 of the linear motor assembly 201, and the inner frame 260 is provided with a movement channel 261, which separates the piston 241 from the permanent magnet 242, the piston 241 moves linearly in the movement channel 261, and the permanent magnet 242 is located outside the movement channel 261. In addition, the stator units 230 are arranged on both sides of the movement channel 261. One end of the movement channel 261 is closed, and the other end is open, the open end of the movement channel 261 is in communication with the back pressure chamber 202, and the closed end of the movement channel 261 forms the compression chamber 270 with the piston 241.

[0063] In the above description, the support unit 250 can be a leaf spring. The use of the support unit 250 can ensure that the piston 241 always maintains a small gap with the movement channel 261, and does not produce any mechanical friction, thereby prolonging the service life of the linear motor assembly 201 and improving efficiency.

[0064] Specifically, in some embodiments of the present application, the piston 241 is provided with an air suction channel 244, one end of the air suction channel 244 is provided with a first one-way valve 245, and the first one-way valve 245 is between the air suction channel 244 and the inner frame 260. The compression chamber 270. When the first one-way valve 245 is open, the air suction channel 244 communicates the compression chamber 270 and the back pressure chamber 202.

[0065] Further, in some optional embodiments of the present application, the inner frame 260 is provided with an exhaust channel, and the exhaust channel is provided with a second one-way valve 262. When the second one-way valve 262 is open, the compression chamber 270 is in communication with the exhaust chamber 203.

[0066] In other words, as Figure 2As shown, for the compression process of the piston 241, low pressure gas enters the first back pressure chamber 211 of the first linear motor assembly 210 from the gas inlet 101. When the piston 241 of the first linear motor assembly 210 moves towards the first back pressure chamber 211 under the action of the coil 232 and the permanent magnet 242, the pressure of the first compression chamber 271 of the first linear motor assembly 210 decreases and is lower than that of the first back pressure chamber 211. At this time, the first one-way valve 245 opens, and the gas enters the first compression chamber 271 from the first back pressure chamber 211 through the suction passage 244.

[0067] At the same time, because the phase difference between the first linear motor assembly 210 and the second linear motor assembly 220 is 180 degrees, when the piston 241 of the first linear motor assembly 210 moves towards the first back pressure chamber 211, the piston 241 of the second linear motor assembly 220 moves towards the second compression chamber 272 of the second linear motor assembly 220. The pressure of the second back pressure chamber 221 of the second linear motor assembly 220, that is, the pressure of the first exhaust chamber 212, is higher than that of the first compression chamber 271, and the second one-way valve 262 is closed.

[0068] When the piston 241 of the first linear motor assembly 210 moves towards the first compression chamber 271, the pressure of the first compression chamber 271 increases and is higher than that of the first exhaust chamber 212. Therefore, the second one-way valve 262 opens, and the gas enters the first exhaust chamber 212 from the first compression chamber 271, completing the first-stage compression.

[0069] Because the first exhaust chamber 212 and the second back pressure chamber 221 share one chamber, after the gas is discharged from the first linear motor assembly 210, it enters the second back pressure chamber 221. At this time, the movement direction of the piston 241 of the second linear motor assembly 220 is opposite to that of the piston 241 of the first linear motor assembly 210, and the piston 241 of the second linear motor assembly 220 moves towards the second back pressure chamber 221. The pressure of the gas discharged from the first compression chamber 271 is higher than that of the second compression chamber 272, and the first one-way valve 245 of the second linear motor assembly 220 opens. Therefore, the gas enters the second compression chamber 272 from the first exhaust chamber 212 (or the second back pressure chamber 221) through the suction passage 244 of the piston 241 of the second linear motor assembly 220.

[0070] Similarly, for the compression process of the first linear motor assembly 210, the second linear motor assembly 220 performs second-stage compression on the gas. The gas compressed in the second stage enters the second exhaust chamber 222 and is then discharged from the gas outlet 102.

[0071] In addition, in one embodiment of the present application, the linear compressor further comprises a heat exchanger 104 and a cooler 103, the heat exchanger 104 is arranged at the gas inlet 101 of the back pressure chamber 202, and the cooler 103 is arranged at the second one-way valve 262 of the exhaust chamber 203. The heat exchanger 104 cools the gas entering from the gas inlet 101, and the cooler 103 cools the compressed gas. The cooler 103 is arranged at the second one-way valve 262 of each linear motor assembly 201. The intermediate cooling is achieved, and the power consumption of multi-stage compression is reduced.

[0072] With reference to the foregoing Figure 1 and Figure 2 In an optional embodiment of the present application, the inner frame body 260 is provided with an air floating channel 300, the air floating channel 300 comprises an air floating inlet 301 and an air floating outlet 302, the air floating inlet 301 is communicated with the exhaust chamber 203, and the air floating outlet 302 is communicated at the gap between the piston 241 and the movement channel 261.

[0073] In each stage, as shown in Figure 2 the linear motor assembly 201 can guide part of the gas flow from the exhaust chamber 203 thereof to the gap between the movement channel 261 and the piston 241, and the gas flow of the air floating channel 300 can be used to suspend the piston 241 in the movement channel 261, so as to avoid the mechanical friction between the piston 241 and the movement channel 261, and improve the efficiency and service life.

[0074] In addition, as shown in Figure 1 the gas flow of the air floating channel 300 can also be guided from the exhaust chamber 203 of the linear motor assembly 201 of the next stage (or the later stage), in other words, the air floating inlet 301 of the air floating channel 300 can be communicated with the exhaust chamber 203 where the gas outlet 102 is arranged, so that the pressure of the air floating outlet 302 is higher, and the suspension effect of the piston 241 is better. In order to communicate the air floating channels 300 of the linear motor assemblies 201 of each stage, corresponding communication holes can be arranged on the shell 100, so as to realize the communication between the air floating inlets 301 and the air floating outlets 301.

[0075] Further, one air floating inlet 301 can be arranged on the end face of the inner frame body 260. A plurality of air floating inlets 301 can also be arranged on the end face of the inner frame body 260 at equal angles. The air floating outlet 302 comprises a plurality of air floating outlets 302 which are evenly arranged on the inner wall of the inner frame body 260 forming the movement channel 261, and the air floating outlet 302 surrounds the piston 241, for example, there can be eight air floating outlets 302.

[0076] The linear compressor provided by the application realizes one-stage compression with the increase of one linear motor assembly, thereby efficiently improving the compression ratio, and the back pressure cavity and the exhaust cavity of adjacent linear motor assemblies can share one cavity, thereby reducing the volume of the linear compressor, the momentum of all the linear motor assemblies in the shell is zero, mechanical vibration is reduced, and noise is reduced.

[0077] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A linear compressor, characterized by, The application relates to a linear compressor, which comprises a shell, a compressor core, an air inlet and an air outlet. The compressor core is arranged in the shell and comprises at least two linear motor assemblies which are sequentially connected in series on the same axis, each of the linear motor assemblies comprises a back pressure cavity and an exhaust cavity, the exhaust cavity of one linear motor assembly is communicated with the back pressure cavity of the adjacent linear motor assembly, the back pressure cavity of the head linear motor assembly is communicated with the air inlet, and the exhaust cavity of the tail linear motor assembly is communicated with the air outlet. The momentum sum of all the linear motor assemblies of the compressor core is zero. When the number of the linear motor assemblies in the shell is odd, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 360 degrees / N, wherein N represents the number of the linear motor assemblies, and N is an odd number greater than 1. When the number of the linear motor assemblies in the shell is even, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 360 degrees / N, wherein N represents the number of the linear motor assemblies, and N is an even number greater than or equal to 2. Alternatively, when the number of the linear motor assemblies is an even number greater than or equal to 2, the current frequency of each linear motor assembly is equal, and the phase difference of the current of adjacent linear motor assemblies is 180 degrees. The linear motor assembly comprises a stator unit, a mover unit and a support unit, the mover unit is connected with the support unit, the stator unit can drive the mover unit and the support unit to reciprocate after being electrified, and the support unit is plate spring support or air floating support.

2. The linear compressor according to claim 1, wherein the stator unit comprises a coil and a magnetically conductive silicon steel sheet, and the magnetically conductive silicon steel sheet is arranged on the outer wall of the coil. The mover unit comprises a permanent magnet, a piston and a connecting framework, the connecting framework connects the permanent magnet and the piston, the permanent magnet is opposite to the coil, and the coil drives the permanent magnet to linearly move. The connecting framework is connected with the support unit.

3. The linear compressor of claim 2, wherein, The linear motor assembly further comprises an inner frame body which separates the back pressure cavity and the exhaust cavity of the linear motor assembly. The inner frame body is provided with a movement channel which separates the piston and the permanent magnet, the piston linearly moves in the movement channel, and the permanent magnet is arranged outside the movement channel.

4. The linear compressor of claim 3, wherein, The inner frame body is provided with an air floating channel which comprises an air floating air inlet and an air floating air outlet, the air floating air inlet is communicated with the exhaust cavity, and the air floating air outlet is communicated with the gap between the piston and the movement channel in the circumferential direction. The piston is provided with an air suction channel, one end of the air suction channel is provided with a first one-way valve, and the first one-way valve and the inner frame body form a compression cavity.

5. The linear compressor of claim 4, wherein, In the open state of the first one-way valve, the air suction channel communicates the compression cavity and the back pressure cavity.

6. The linear compressor of claim 4, wherein, ​ ​ 7. The linear compressor of claim 6, wherein, The inner frame body is provided with an exhaust passage, and the exhaust passage is provided with a second one-way valve, In the open state of the second one-way valve, the compression cavity is communicated with the exhaust cavity.

8. The linear compressor of claim 7, wherein, Further comprising a heat exchanger and a cooler, the heat exchanger is arranged at the gas inlet of the back pressure cavity, and the cooler is arranged at the second one-way valve of the exhaust cavity.

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