Linear compressor and refrigerator

Abstract

The utility model discloses a linear compressor. The linear compressor comprises a shell, a rotor assembly, a compression piston and a stator assembly. The rotor assembly is arranged in the shell; the compression piston is arranged in the shell and connected with the rotor assembly. The stator assembly is arranged on the shell and used for driving the rotor assembly to reciprocate in the first direction, the stator assembly comprises an outer magnet yoke, the outer magnet yoke comprises a pole ring and two pole shoes, the two pole shoes are arranged on the same side of the pole ring at intervals in the first direction, each pole shoe comprises a connecting part and an extending part, the connecting parts are connected with the pole ring, and the extending parts are connected with the pole ring. The extending parts are connected with the sides, away from the polar rings, of the connecting parts, and each extending part extends towards the other extending part so that a winding space for winding a coil can be defined by the extending parts and the polar rings. The extension parts of the two pole shoes extend towards the inner side, the structure is more compact, the size is smaller, the linear compressor can be matched with the compression piston with the shorter length, the machining difficulty of the compression piston is reduced, and meanwhile the miniaturization design of the linear compressor is facilitated. The utility model further discloses a refrigerating machine.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigeration equipment, and particularly relates to a linear compressor and a refrigeration machine. BACKGROUND

[0002] The linear compressor can provide a pressure wave required for refrigeration for a Stirling refrigeration machine and a pulse tube refrigeration machine, and is a power source and a key component of the refrigeration machine. There are two common piston support modes in the linear compressor, one is to use a column spring support, and the other is to use a plate spring support. The advantages of the column spring support are simple structure, convenient installation and good damping effect, but the column spring can provide smaller stiffness, and the poor radial support will increase the wear between the piston and the cylinder; if the plate spring support is used, larger spring stiffness and good radial support can be provided. However, the existing linear compressor is large in size. CONTENT OF THE UTILITY MODEL

[0003] The technical problem to be solved by the application is that the existing linear compressor is large in size. To solve the technical problem, a linear compressor and a refrigeration machine are provided, which are small in size.

[0004] The technical scheme provided by the application is as follows:

[0005] A linear compressor comprises:

[0006] a housing;

[0007] a mover assembly arranged in the housing and movable reciprocally along a first direction;

[0008] a compression piston arranged in the housing and connected with the mover assembly to move reciprocally along the first direction with the mover assembly;

[0009] a stator assembly arranged in the housing and configured to drive the mover assembly to move reciprocally along the first direction, and the stator assembly comprises an outer magnetic yoke, the outer magnetic yoke comprises a pole ring and two pole shoes, and the two pole shoes are arranged on the same side of the pole ring and spaced apart along the first direction;

[0010] Each of the pole shoes comprises a connecting portion and an extending portion, the connecting portion is connected with the pole ring, the extending portion is connected with the connecting portion on a side away from the pole ring, and each of the extending portions extends towards the other extending portion to form a winding space for winding a coil with the pole ring.

[0011] In the linear compressor, the two extending portions of the pole shoes extend towards each other, i.e. extend towards the inner side, compared with extending towards the outer side, the structure is more compact and smaller in size, so that the linear compressor can be matched with a compression piston of shorter length, the machining difficulty of the compression piston is reduced, and the miniaturization design of the linear compressor is also facilitated.

[0012] Further, the linear compressor further comprises a first leaf spring and a second leaf spring, both of which are arranged in the housing and are spaced apart along the first direction;

[0013] In the first direction, both the stator assembly and the mover assembly are located between the first leaf spring and the second leaf spring, one end of the compression piston along the first direction is connected with the first leaf spring, and one end of the mover assembly away from the first leaf spring is connected with the second leaf spring.

[0014] Further, the housing comprises a movable cavity, a first mounting cavity and a second mounting cavity, one end of the movable cavity along the first direction is communicated with the first mounting cavity, the second mounting cavity is arranged around the movable cavity, and one end of the second mounting cavity along the first direction is communicated with the first mounting cavity;

[0015] The first leaf spring is arranged in the first mounting cavity, the compression piston is arranged in the movable cavity and can reciprocate along the first direction, and the compression piston partially extends into the first mounting cavity and is connected with the first leaf spring, the mover assembly and the second leaf spring are both arranged in the second mounting cavity, and the mover assembly partially extends into the first mounting cavity and is connected with the part of the compression piston extending into the first mounting cavity.

[0016] Further, the housing further comprises a third mounting cavity, the third mounting cavity is located on the side of the second mounting cavity away from the movable cavity, and the outer magnetic yoke is arranged in the third mounting cavity.

[0017] Further, the side wall of the housing further comprises a first opening communicated with the third mounting cavity, one of the pole shoes is provided with a second opening communicated with the winding space, and both the first opening and the second opening can be used for the coil to enter and exit.

[0018] Further, the mover assembly comprises a mover skeleton and a magnetic ring, the mover skeleton is arranged in the second mounting cavity and can reciprocate along the first direction, one end of the mover skeleton away from the first leaf spring is connected with the second leaf spring, and the mover skeleton partially extends into the first mounting cavity and is connected with the compression piston, and the magnetic ring is arranged in the mover skeleton and located in the second mounting cavity.

[0019] Further, with respect to a plane perpendicular to the first direction, the housing comprises two parts symmetrical to each other, each part comprises the movable cavity, the first mounting cavity and the second mounting cavity, and the two movable cavities are communicated with each other, and the two first mounting cavities are located at both ends of the housing along the first direction.

[0020] The linear compressor comprises two first flat springs, two second flat springs, two compression pistons, two sets of stator assemblies and two sets of mover assemblies corresponding to the two parts respectively.

[0021] Further, the shell is further provided with a communication hole penetrating through the side wall of the shell and communicating with the two movable cavities.

[0022] Further, the stator assembly further comprises an inner magnetic yoke, the outer magnetic yoke and the inner magnetic yoke are arranged in a direction perpendicular to the first direction, and the mover assembly partially penetrates between the outer magnetic yoke and the inner magnetic yoke.

[0023] A refrigerator comprising the linear compressor as described above.

[0024] The linear compressor and the refrigerator provided by the application have at least the following advantages:

[0025] 1. The extension of the pole shoe extends inward, reducing the axial size, making the structure more compact, so that the linear compressor can use a shorter compression piston, which is conducive to the miniaturization design of the linear compressor and reduces the size of the linear compressor.

[0026] 2. The first flat spring and the second flat spring are arranged, and the first flat spring is connected with the compression piston, and the second flat spring is connected with the mover framework, which can not only improve the radial stiffness, reduce the radial displacement and reduce the wear of the compression piston, but also further reduce the size of the linear compressor.

[0027] 3. The two ends of the extension along the first direction protrude from the connecting portion, and the side wall of the shell is provided with a first opening, and the pole shoe is provided with a second opening, both the first opening and the second opening can be used for the coil to enter and exit, thereby reducing the process difficulty of winding.

[0028] 4. The end cover is designed in an arc shape, and the shell, the end cover and the mounting framework are fixed by welding, which improves the structural strength and reduces the probability of deformation caused by pressure. DETAILED DESCRIPTION

[0029] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, which together with the embodiments of the application, are used to explain the application, and do not constitute a limitation on the application.

[0030] Figure 1 The structure diagram of the linear compressor provided by an embodiment of the application.

[0031] Label explanation:

[0032] 111, housing; 112, end cover; 113, mounting skeleton; 114, cylinder; 1141, movable cavity; 1142, communication hole; 115, first mounting cavity; 116, second mounting cavity; 117, third mounting cavity; 118, first opening; 120, stator assembly; 121, outer magnetic yoke; 1211, pole ring; 1212, pole shoe; 1213, connecting part; 1214, extension part; 1215, second opening; 122, inner magnetic yoke; 130, mover assembly; 131, mover skeleton; 132, magnetic ring; 140, compression piston; 150, first leaf spring; 160, second leaf spring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not 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 of the present application.

[0035] In one aspect, the present application provides a linear compressor applied to a refrigeration machine. As shown in the drawings, the linear compressor includes a housing, a stator assembly 120, a mover assembly 130 and a compression piston 140. Figure 1

[0036] The mover assembly 130 and the compression piston 140 are both arranged in the housing to be reciprocally movable in a first direction, and the mover assembly 130 is connected with the compression piston 140. The stator assembly 120 is arranged in the housing to drive the mover assembly 130 to reciprocally move in the first direction, thereby driving the compression piston 140 to reciprocally move in the first direction.

[0037] ​Further, the stator assembly 120 comprises an outer magnetic yoke 121, which comprises a pole ring 1211 and two pole shoes 1212 located on the same side of the pole ring 1211 and spaced apart along the first direction. Each pole shoe 1212 comprises a connecting portion 1213 connected with the pole ring 1211 and an extending portion 1214 connected with the connecting portion 1213 away from the pole ring 1211, and each extending portion 1214 extends towards the other extending portion 1214 to enclose a winding space with the pole ring 1211.

[0038] With the linear compressor, the extending portions 1214 of the two pole shoes 1212 extend towards each other, i.e. extend inwards, which is more compact and smaller in size compared with extending outwards, so that the linear compressor can be matched with a compression piston 140 of shorter length, reducing the processing difficulty of the compression piston 140, and facilitating the miniaturization design of the linear compressor.

[0039] Further, the two ends of the extending portion 1214 along the first direction protrude from the connecting portion 1213, so as to form an I-shaped structure with the pole ring 1211 and the connecting portion 1213, facilitating winding. It should be noted that the length of the extending portion 1214 protruding from the connecting portion 1213 outwards is less than the length of the extending portion 1214 protruding from the connecting portion 1213 inwards, i.e. the structure is compact and winding is facilitated.

[0040] In an embodiment, the shell comprises a movable cavity 1141, a first mounting cavity 115 and a second mounting cavity 116. The movable cavity 1141 is in communication with the first mounting cavity 115 at one end along the first direction, and the second mounting cavity 116 is arranged around the movable cavity 1141 and in communication with the first mounting cavity 115 at one end along the first direction. Figure 1 It can be seen that the first mounting cavity 115 is located at the end of the shell along the first direction, and the movable cavity 1141 and the second mounting cavity 116 are in communication with the first mounting cavity 115 at the same end along the first direction, and the movable cavity 1141 and the second mounting cavity 116 are in communication through the first mounting cavity 115.

[0041] The mover assembly 130 is arranged in the second mounting cavity 116 and partially extends into the first mounting cavity 115, and the compression piston 140 is arranged in the movable cavity 1141 and reciprocally movable along the first direction, and one end of the compression piston 140 along the first direction can extend into the first mounting cavity 115 and be connected with the part of the mover assembly 130 extending into the first mounting cavity 115, so as to reciprocally move along the first direction with the mover assembly 130.

[0042] Further, the shell is further provided with a third installation cavity 117, which is located on the side of the second installation cavity 116 away from the movable cavity 1141, and the outer magnetic yoke 121 is arranged in the third installation cavity 117. Further, the side wall of the shell is further provided with a first opening 118 in communication with the third installation cavity 117, and one of the pole shoes 1212 is provided with a second opening 1215 in communication with the winding space, and the first opening 118 and the second opening 1215 can be used for the coil to enter and exit, so as to further reduce the process difficulty of winding.

[0043] In one embodiment, the reference plane is perpendicular to the first direction, that is, Figure 1 The shell includes two parts symmetrical to each other, each part including the movable cavity 1141, the first installation cavity 115 and the second installation cavity 116, and the two first installation cavities 115 are located at the two ends of the shell along the first direction, and the two movable cavities 1141 are in communication with each other. Similarly, the linear compressor includes two first plate springs 150, two second plate springs 160, two compression pistons 140, two sets of stator assemblies 120 and two sets of mover assemblies 130 corresponding to the two parts.

[0044] In one embodiment, the shell is further provided with a communication hole 1142, which penetrates the side wall of the shell and is in communication with the two movable cavities 1141 at the same time, so as to realize gas exchange. It can be understood that the communication hole 1142 is located on the above-mentioned reference plane.

[0045] In one embodiment, the shell includes a shell 111, an installation skeleton 113, an end cover 112 and a cylinder 114, the end cover 112 is connected to one end of the shell 111 along the first direction, the installation skeleton 113 is fixedly connected with the shell 111 and the end cover 112, and the cylinder 114 is connected to the end of the installation skeleton 113 away from the end cover 112. The cylinder 114 has the movable cavity 1141 and the communication hole 1142, that is, the compression piston 140 is arranged in the cylinder 114 along the first direction and can reciprocate; the end cover 112 is used for sealing one end of the shell 111 and the installation skeleton 113 to form the first installation cavity 115 at the end, the installation skeleton 113 and the cylinder 114 form the second installation cavity 116, and the shell 111 and the installation skeleton 113 form the third installation cavity 117.

[0046] Preferably, the end cover 112 adopts an arc-shaped design, that is, the surface of the end cover 112 surrounding the first installation cavity 115 is a curved surface, which can reduce the deformation of the end cover 112 caused by pressure. At the same time, the shell 111, the end cover 112 and the installation skeleton 113 can be connected by welding to improve the structural strength. The installation skeleton 113 and the cylinder 114 can be connected by bonding or welding.

[0047] In one embodiment, the linear compressor further comprises a first leaf spring 150 and a second leaf spring 160, the first leaf spring 150 is arranged in the first mounting cavity 115, and the second leaf spring 160 is arranged in the second mounting cavity 116, and the stator assembly 120 and the mover assembly 130 are both located between the first leaf spring 150 and the second leaf spring 160 in the first direction. One end of the compression piston 140 extending into the first mounting cavity 115 is connected with the first leaf spring 150, and the end of the mover assembly 130 away from the first leaf spring 150 is connected with the second leaf spring 160, so as to provide radial support to the mover assembly 130 and the compression piston 140 through the first leaf spring 150 and the second leaf spring 160.

[0048] The first leaf spring 150 is connected with one end of the compression piston 140, and the second leaf spring 160 is connected with the mover assembly 130, and the mover assembly 130 is connected with the compression piston 140, so that the mover assembly 130 and the compression piston 140 are simultaneously radially supported by the first leaf spring 150 and the second leaf spring 160, thereby ensuring the support strength of the mover assembly 130 and the compression piston 140, effectively limiting the radial displacement of the mover assembly 130 and the compression piston 140, reducing the wear of the mover assembly 130 and the compression piston 140, reducing the power consumption during operation, and prolonging the service life of the compressor.

[0049] In addition, it should be noted that, in Figure 1 In the embodiment shown, the moving stroke of the compression piston 140 is determined, that is, in the first direction, the moving stroke of the compression piston 140 will exceed the area where the stator assembly 120 is located, so that there is a redundant space at the end of the second mounting cavity 116 away from the first mounting cavity 115, that is, Figure 1 the space for installing the second leaf spring 160. Compared with arranging the second leaf spring 160 and the first leaf spring 150 in the first mounting cavity 115, arranging the second leaf spring 160 in the redundant space can further reduce the size of the linear compressor in the first direction.

[0050] In one embodiment, the stator assembly 120 further comprises an inner magnetic yoke 122, and the outer magnetic yoke 121 and the inner magnetic yoke 122 are arranged in a direction perpendicular to the first direction, that is, arranged in a radial direction, and the mover assembly 130 partially passes between the outer magnetic yoke 121 and the inner magnetic yoke 122 to reciprocate in the first direction under the action of the stator assembly 120. It should be noted that by passing current in the coil of the outer magnetic yoke 121, the mover assembly 130 can be driven to reciprocate in the first direction. In the embodiment shown, Figure 1 The inner magnetic yoke 122 is located in the second mounting cavity 116.

[0051] In one embodiment, the mover assembly 130 comprises a mover skeleton 131 and a magnetic ring 132, the mover skeleton 131 is arranged in the second mounting cavity 116 to be reciprocally movable along the first direction, the end of the mover skeleton 131 away from the first leaf spring 150 is connected with the second leaf spring 160, and the mover skeleton 131 partially extends into the first mounting cavity 115 and is connected with the compression piston 140. The magnetic ring 132 is arranged on the mover skeleton 131 and located between the outer magnetic yoke 121 and the inner magnetic yoke 122 in the second mounting cavity 116, so as to drive the mover skeleton 131 and the compression piston 140 to reciprocally move along the first direction under the action of the stator assembly 120.

[0052] It should be noted that the action process and principle of the linear compressor are well known to those skilled in the art, and will not be described here. However, the linear compressor provided by the present application has at least the following advantages:

[0053] 1. The extension part 1214 of the pole shoe 1212 extends inward, which reduces the axial size, makes the structure more compact, and enables the linear compressor to use a shorter compression piston 140, which is conducive to the miniaturization design of the linear compressor and reduces the size of the linear compressor.

[0054] 2. The first leaf spring 150 and the second leaf spring 160 are arranged, and the first leaf spring 150 is connected with the compression piston 140, and the second leaf spring 160 is connected with the mover skeleton 131, which can not only improve the radial stiffness, reduce the radial displacement, and reduce the wear of the compression piston 140, but also further reduce the size of the linear compressor.

[0055] 3. The two ends of the extension part 1214 along the first direction protrude from the connecting part 1213, and the side wall of the shell is provided with a first opening 118, and the pole shoe 1212 is provided with a second opening 1215, both the first opening 118 and the second opening 1215 can be used for the coil to enter and exit, thereby reducing the process difficulty of winding.

[0056] 4. The end cover 112 is designed in an arc shape, and the shell 111, the end cover 112 and the mounting skeleton 113 are fixed by welding, which improves the structural strength and reduces the probability of deformation caused by pressure.

[0057] On the other hand, the present application also provides a refrigeration machine, which comprises the linear compressor in the above embodiments. The refrigeration machine can be a Stirling refrigeration machine, a pulse tube refrigeration machine, or a Stirling / pulse tube hybrid refrigeration machine, etc.

[0058] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. Linear compressor, characterized in that, The linear compressor comprises a housing, a mover assembly arranged in the housing and movable reciprocally along a first direction, a compression piston arranged in the housing and connected with the mover assembly to move reciprocally along the first direction with the mover assembly, and a stator assembly arranged in the housing to drive the mover assembly to move reciprocally along the first direction, wherein the stator assembly comprises an outer magnetic yoke comprising a pole ring and two pole shoes arranged on the same side of the pole ring along the first direction. Each of the pole shoes comprises a connecting portion connected with the pole ring and an extending portion connected with the connecting portion away from the pole ring, and each of the extending portions extends towards the other extending portion to enclose a winding space with the pole ring. The linear compressor further comprises a first leaf spring and a second leaf spring arranged in the housing and spaced apart along the first direction. In the first direction, the stator assembly and the mover assembly are located between the first leaf spring and the second leaf spring, one end of the compression piston along the first direction is connected with the first leaf spring, and one end of the mover assembly away from the first leaf spring is connected with the second leaf spring. The housing comprises a movable cavity, a first mounting cavity, and a second mounting cavity, one end of the movable cavity along the first direction is communicated with the first mounting cavity, and the second mounting cavity is arranged around the movable cavity and one end of the second mounting cavity along the first direction is communicated with the first mounting cavity. The first leaf spring is arranged in the first mounting cavity, the compression piston is arranged in the movable cavity and movable reciprocally along the first direction, and the compression piston partially extends into the first mounting cavity and is connected with the first leaf spring, the mover assembly and the second leaf spring are arranged in the second mounting cavity, and the mover assembly partially extends into the first mounting cavity to be connected with the part of the compression piston extending into the first mounting cavity.

2. Linear compressor according to claim 1, characterized in that The housing further comprises a third mounting cavity located on the side of the second mounting cavity away from the movable cavity, and the outer magnetic yoke is arranged in the third mounting cavity. The side wall of the housing further comprises a first opening communicated with the third mounting cavity, one of the pole shoes is provided with a second opening communicated with the winding space, and the first opening and the second opening are capable of allowing the coil to enter and exit.

3. Linear compressor according to claim 2, characterized in that, The mover assembly comprises a mover framework and a magnetic ring, the mover framework is arranged in the second mounting cavity and movable reciprocally along the first direction, one end of the mover framework away from the first leaf spring is connected with the second leaf spring, and the mover framework partially extends into the first mounting cavity and is connected with the compression piston, and the magnetic ring is arranged in the mover framework and located in the second mounting cavity. ​ 4. Linear compressor according to claim 3, characterized in that ​ 5. Linear compressor according to claim 4, characterized in that, ​ 6. Linear compressor according to claim 3, characterized in that, ​ 7. Linear compressor according to claim 3, characterized in that, With a plane perpendicular to the first direction as a reference, the shell comprises two portions symmetrical to each other, each portion comprising the movable cavity, the first mounting cavity and the second mounting cavity, and the two movable cavities are in communication with each other, and the two first mounting cavities are located at two ends of the shell along the first direction; The linear compressor comprises two first plate springs, two second plate springs, two compression pistons, two sets of stator assemblies and two sets of mover assemblies corresponding to the two portions respectively.

8. Linear compressor according to claim 7, characterized in that The shell is further provided with a communication hole penetrating through the side wall of the shell and in communication with the two movable cavities.

9. Linear compressor according to claim 1, characterized in that, The stator assembly further comprises an inner magnetic yoke, the outer magnetic yoke and the inner magnetic yoke are arranged in a spaced manner along a direction perpendicular to the first direction, and the mover assembly partially penetrates between the outer magnetic yoke and the inner magnetic yoke.

10. A refrigerator characterized by comprising: The linear compressor comprises the linear compressor according to any one of claims 1-9.

Images