CN203627131U - Oppositely-arranged moving coil linear compressor allowing axial magnetizing to be achieved through long coils - Google Patents

Abstract

This patent discloses an opposed moving coil linear compressor adopting axial magnetization of long coils. The overall structure adopts the opposed type to offset the mechanical vibration of the left and right parts; Cylinder liner, permanent magnet, upper yoke, lower yoke, current-carrying coil, coil bobbin, piston, upper leaf spring group, lower leaf spring group, upper pressing structure, lower pressing structure, upper supporting structure, lower Supporting structure, displacement sensor core, displacement sensor coil, displacement sensor support, and casing; the permanent magnet is axially magnetized, and the current-carrying coil adopts a long coil; the upper yoke iron, piston and current-carrying coil on the left and right parts need It is satisfied that the axial height of each current-carrying coil is greater than the sum of the axial thickness of each upper yoke and the maximum stroke of each piston. The patent has the advantages of compact structure, low vibration, high motor efficiency and long life expectancy, and is of great significance to the development of high reliability, long life and high efficiency linear compressors.

Description

Opposed dynamic coil linear compressor with long coil axial magnetization

technical field

This patent relates to a linear compressor, in particular to an opposed moving-coil linear compressor adopting axial magnetization of a long coil.

Background technique

Linear compressors are a type of reciprocating piston compressors. Most of the traditional reciprocating piston compressors are rotary compressors, which are driven by a rotary motor and achieve reciprocating motion through mechanical transmission such as a crank connecting rod mechanism. The technology of the rotary compressor is relatively mature, but its energy transmission links are many, the vibration and noise are large, the control of the whole machine is complicated, and the energy conversion efficiency is low. One of the main sources of wear, thus greatly limiting its working life. The linear compressor uses a linear motor to drive the piston to make a reciprocating linear motion in the cylinder, which theoretically completely eliminates the radial force on the piston, thus eliminating the mechanical wear between the piston and the cylinder wall and the resulting useless work. Both energy and energy conversion efficiency are greatly improved, so it has very important applications in special fields such as aviation, aerospace, and military that require long life and high-efficiency work.

The core component of the linear compressor is the linear motor. Linear motors are mainly divided into three categories according to the moving parts: moving iron type, moving coil type and moving magnet type. The moving iron linear motor does not use permanent magnets, so the price is relatively low, but the performance is relatively unstable, the control is difficult, and its application is gradually reduced; both the moving coil and the moving magnet linear motor include three types of core components: permanent magnet, yoke Iron and current-carrying coils are divided into moving coil and moving magnet according to whether the current-carrying coil or the permanent magnet moves when moving. Among them, the moving coil linear compressor realizes the complete elimination of radial force due to its structural characteristics, and does not generate axial force and torque on the current-carrying coil when the circuit is open, so it has high efficiency, low noise and high reliability. Because of its outstanding advantages, it has become the preferred power source for space regenerative cryogenic refrigerators (such as pulse tube refrigerators and Stirling refrigerators) in the past 30 years. Taking the western developed countries represented by the United States as an example, most of the aerospace pulse tube refrigerators and Stirling refrigerators launched into space in the past 20 years have adopted moving coil linear compressors.

At present, the moving coil linear compressors used in the aerospace field in the world that need to ensure long life, high reliability and high efficiency work mainly adopt Oxford type and opposed structure. The so-called Oxford type is named after two key technologies of Oxford University in the United Kingdom - gap seal and leaf spring support. These two technologies are the key guarantees for long-life operation without oil lubrication; the so-called opposed structure is It refers to the use of two completely equal movement and support structures in the main structure to offset the mechanical vibration generated by itself. This technology is a reliable guarantee for the low vibration of the linear compressor.

As mentioned earlier, a moving coil linear motor consists of three core components: permanent magnets, yokes, and current-carrying coils. When working, the current-carrying coil is in the air gap formed by the permanent magnet and the yoke iron, and is affected by the magnetic field force to move in a reciprocating linear motion. According to the length of the current-carrying coil and the magnetization direction of the permanent magnet, the moving coil linear motor can be divided into four types. Figure 1 shows the schematic diagrams of these four forms, where (1) is the long coil axial magnetization form , (2) is the form of short coil axial magnetization, (3) is the form of long coil radial magnetization, (4) is the form of short coil radial magnetization, of which 63 is the permanent magnet, 64 is the upper yoke, 65 For the lower yoke, 66 is a current-carrying coil, and 67 is a central through hole.

Moving coil linear compressors are also divided into four types according to the types of linear motors they use, namely: moving coil linear compressors using long coils for axial magnetization, and using short coils for axial magnetization Moving coil linear compressor, moving coil linear compressor using long coil radial magnetization, moving coil linear compressor using short coil radial magnetization. Regardless of which of the above four forms the moving coil linear compressor adopts, if it is to ensure that it can work stably, the following basic principles must be followed: (1) Either in the entire piston stroke, the stable magnetic field must always be at (corresponding to the long coil form); (2) either throughout the entire piston stroke, always ensure that the current-carrying coil is within a stable magnetic field (corresponding to the short coil form). At present, the development of these four types of moving coil linear compressors has just started in China.

Contents of the invention

This patent proposes an opposed moving-coil linear compressor adopting axial magnetization of long coils.

The invented opposed moving coil linear compressor adopting long coil axial magnetization consists of a common base 0, a left cylinder liner 1, a left permanent magnet 2, a left upper yoke 3, a left lower yoke 4, Left current-carrying coil 5, left coil bobbin 6, left piston 7, left upper plate spring group 8, left lower plate spring group 9, left upper pressing structure 10, left lower pressing structure 11, left Upper support structure 12, left lower support structure 13, left displacement sensor core 14, left displacement sensor coil 15, left displacement sensor support 16, left casing 17, right cylinder liner 1′, right permanent Magnet 2', right upper yoke 3', right lower yoke 4', right current-carrying coil 5', right bobbin 6', right piston 7', right upper plate spring group 8', right The lower leaf spring group 9', the right upper pressing structure 10', the right lower pressing structure 11', the right upper supporting structure 12', the right lower supporting structure 13', the right displacement sensor core 14', the right The displacement sensor coil 15', the right displacement sensor support 16', and the right casing 17' are composed together. It is characterized in that the overall structure adopts an opposed type to offset the mechanical vibration generated by the left and right parts, that is, it is symmetrical with the vertical center line 40 Shaft, all parts and structural arrangement of the left part and the corresponding parts and structural arrangement of the right part are mirror images of each other; the horizontal axis 50 indicates the axial direction; the common machine base 0 is composed of the left part cylinder 41, the right part cylinder 41' and the common outlet Composed of air holes 42; the left cylinder liner 1 is embedded in the left cylinder 41 with an interference fit, and the right cylinder liner 1' is embedded in the right cylinder 41' with an interference fit; the left permanent magnet 2 is a cylinder shaped structure, the central position is processed with a left magnet internal through hole 43 with a diameter of d along the axial direction; the left upper yoke 3 is a cylindrical structure, and its outer diameter is equal to that of the left permanent magnet 2, and the central position The inner through hole 44 of the left upper yoke with a diameter of d is machined in the axial direction; the left lower yoke 4 is a U-shaped structure, and the inner diameter of the U-shaped body is greater than the outer diameter of the left permanent magnet 2, at the center of the bottom of the U-shaped body The inner through hole 45 of the left lower yoke with a diameter of d is machined in the axial direction; the left permanent magnet 2 is magnetized to saturation in the axial direction, and then the left upper yoke 3 and the left lower yoke 4 connect the left permanent magnet 2 Completely wrapped in it, the left end face 18 of the left upper yoke is flush with the left end face 19 of the left lower yoke, the right end face 20 of the left upper yoke is closely attached to the left end face 21 of the left permanent magnet, and the right end face of the left permanent magnet 22 and the left end surface 23 of the left lower yoke are closely attached together; the left permanent magnet 2, the left upper yoke 3, and the left lower yoke 4 jointly form a left annular air gap 46, and the left current-carrying coil 5 concentrically Inserted into the left annular air gap 46, the right permanent magnet 2', the right upper yoke 3', and the right lower yoke 4' jointly form the right annular air gap 46', and the right current-carrying coil 5' is the same as The center is inserted into the right annular air gap 46'; the axial heights of the left current-carrying coil 5 and the right current-carrying coil 5' are both h; the maximum strokes of the left piston 7 and the right piston 7' are equal is s; the axial thicknesses of the left upper yoke 3 and the right upper yoke 3′ are both δ, and satisfy the relation: h>s+δ, to ensure that the stable magnetic field is always within the current-carrying coil during the entire piston stroke; the upper left support and the right end surface 24 are supported on the left end surface 19 of the left lower yoke, and the two are fastened by screws. The left side of the left upper support structure 12 is processed into an upper annular plane 25; the right end surface 47 of the lower left support is supported on the left side 48 of the common machine base, and the two are welded together; the left front side 26 of the lower left support is supported on the left lower yoke On the right end face 27 of the iron, the two are fastened by screws, and the lower left side of the left lower support structure 13 is processed into a lower annular plane 28; The left upper group outer edge 29 is formed, and the left upper group inner edge 30 is formed on the inner edge, and a left upper group spring center hole 31 with a diameter of d is machined in the axial direction at the central part, wherein the left upper group outer edge 29 is placed on the left upper support structure 12 above the upper annular plane 25, and fastened by screws; the left lower plate spring group 9 is formed by superimposing a number of single leaf spring sheets, forming the outer edge 32 of the lower left group on the outer edge, and the inner edge of the lower left group on the inner edge 33. A central hole 34 of the left lower group spring body with a diameter of d is machined axially at the central part, wherein the outer edge 32 of the left lower group is placed on the lower annular plane 28 of the left lower support structure 13 and fastened by screws; The left piston 7 is made up of the left piston head 35, the left piston middle transition table 36 and the left piston rod 37. A left rod thread section 49 with a length of 1-3mm is processed at the end of the left piston rod 37. The left piston The outer diameter of the head 35 is 10-30 μm smaller than the inner diameter of the left cylinder 41, while ensuring that the diameter of the left piston rod 37 is smaller than d; Through hole 45, through hole 43 in the left magnet, through hole 44 in the left upper yoke, center hole 31 of the spring body on the left upper group; The left piston rod 37 is fastened together, and the left lower plate structure 11 fastens the inner edge 33 of the left lower group and the middle transition table 36 of the left piston together, thereby ensuring that the left current-carrying coil 5, the left coil bobbin 6 and the The left piston 7, the left upper leaf spring group 8, and the left lower leaf spring group 9 are connected as a whole that can move simultaneously; the left iron core 14 of the left displacement sensor is internally processed with a left iron core that matches the threaded section 49 of the left rod The threaded section 51, the left rod threaded section 49 is screwed into the left iron core threaded section 51 and fastened; the left part displacement sensor coil fastened together with the left part displacement sensor support 16 is set outside the left part displacement sensor iron core 14 15. The left displacement sensor support 16 is further supported on the left upper support structure 12 and fastened together with it; the left casing 17 is welded and fixed to the left lower support outer end surface 52 through the left casing outer end surface 61, thereby Form the left airtight cavity, the left cylinder liner 1, the left permanent magnet 2, the left upper yoke 3, the left lower yoke 4, the left current-carrying coil 5, the left coil skeleton 6, and the left piston 7. Left upper leaf spring group 8, left lower leaf spring group 9, left upper pressing structure 10, left lower pressing structure 11 , the left upper support structure 12, the left lower support structure 13, the left displacement sensor core 14, the left displacement sensor coil 15, the left displacement sensor support 16, and the left casing 17 are all covered therein; all parts of the right And the structural arrangement is a mirror image of the corresponding components and structural arrangement on the left with respect to the vertical centerline 40. The right casing 17' is welded and fixed to the right lower support outer end surface 52' through the right casing outer end surface 61' to form a right airtight Cavity, the right cylinder liner 1', the right permanent magnet 2', the right upper yoke 3', the right lower yoke 4', the right current-carrying coil 5', the right coil bobbin 6', the right Piston 7', right upper leaf spring group 8', right lower leaf spring group 9', right upper pressing structure 10', right lower pressing structure 11', right upper support structure 12', right lower support The structure 13', the right displacement sensor core 14', the right displacement sensor coil 15', the right displacement sensor support 16', and the right casing 17' are all covered therein, thus forming a long coil axially filled Magnetic opposed moving coil linear compressor.

The manufacturing method of the invented opposed moving-coil linear compressor adopting axial magnetization of the long coil is described as follows in conjunction with the accompanying drawings:

Fig. 2 is a plane sectional view of the invented opposed moving coil linear compressor adopting long coil axial magnetization; with the vertical center line 40 as the axis of symmetry, all the parts on the left and the corresponding parts on the right that are mirror images of each other need to adopt Parts produced in the same batch to minimize individual variation;

Figure 3 is a three-dimensional sectional view of the shared machine base 0; the shared machine base 0 is made of titanium alloy material with high mechanical strength and small thermal expansion coefficient, and the left cylinder 41 and the right cylinder 41' are simultaneously processed by a five-axis machine tool to ensure that the left cylinder The cylinder 41 and the right cylinder 41' are symmetrical about the vertical center line 40, and the coaxiality between the left cylinder 41 and the right cylinder 41' is guaranteed to be better than 1.0 μm, and the roundness of the inner holes of the above two cylinders is better than 0.5 μm; After the left cylinder 41 and the right cylinder 41 ' are processed, use the same five-axis machine tool to process the shared air outlet 42 to ensure that the verticality of the shared air outlet 42 and the left cylinder 41 and the right cylinder 41 ' is uniform Better than 2.0μm;

Figure 4 is a three-dimensional sectional view of the left cylinder liner 1 (for the left and right parts that are mirror images of each other, generally only the detailed schematic diagram of the left part is given in the drawings, and the manufacturing method is described together with the left and right parts, below The same); the left cylinder liner 1 and the right cylinder liner 1′ are made of mold steel with a hardness greater than 58 and processed into a cylindrical shape by slow wire cutting to ensure that the left cylinder liner 1 and the right cylinder The outer diameter of the bushing 1' is 0.5-1.0mm larger than the inner diameter of the left cylinder 41 and the right cylinder 41' respectively, and then it is inserted into the left cylinder 41 and the right cylinder respectively by means of interference fit and thermal expansion and contraction. 41', the specific inlay method is as follows: place the shared machine base 0 as shown in Figure 3 in a constant temperature heating box with an internal temperature of 160°C and heat it evenly for 4 to 6 hours. For 5 to 10 minutes, place the left cylinder liner 1 and the right cylinder liner 1′ in liquid nitrogen for soaking at the same time, and take the left cylinder liner 1 and the right The upper cylinder liner 1' is taken out from the liquid nitrogen, and then the left cylinder liner 1 and the right cylinder liner 1' are pushed into the left cylinder 41 and the right cylinder 41' by mechanical external force, so as to ensure that the left The outer walls of the cylinder liner 1 and the right cylinder liner 1' are closely combined with the inner walls of the left cylinder 41 and the right cylinder 41' respectively; The inner hole is finely ground to ensure that the roundness of the inner hole is better than 0.5μm;

Figure 5 is a plane sectional view of the left piston 7; both the left piston 7 and the right piston 7' are made of titanium alloy material with high mechanical strength and small thermal expansion coefficient, and the blank is first processed by a numerical control machine tool, and then refined by a jig grinder. Grinding, to ensure that the roundness of the left piston head 35 and the right piston head 35' is better than 0.5 μm, and to ensure that the axial runout of the left piston rod 37 and the right piston rod 37' is less than 3.0 μm, and that the left The verticality of the first piston rod 37 and the left piston head 35 is better than 1.0 μm, and the verticality of the right piston rod 37 ′ and the right piston head 35 ′ is better than 1.0 μm; The end of 37' uses precision numerical control machine tools to process the left rod thread section 49 and the right rod thread section 49' respectively; the maximum stroke of the left piston 7 and the right piston 7' is designed to be s, and the stroke is guaranteed by the limit structure Accuracy better than 2.0μm;

Fig. 6 is a schematic diagram of the combination of the left upper leaf spring group 8 and the left upper pressing structure 10, and Fig. 7 is a combined schematic diagram of the left lower leaf spring group 9 and the left lower pressing structure 11; the left upper pressing structure 10, The lower tablet structure 11 on the left, the upper tablet structure 10' on the right, and the lower tablet structure 11' on the right are all made of metal materials with high mechanical strength and low residual magnetism using CNC machine tools, and the machining accuracy is better than 9.0 μm; the left upper leaf spring group 8, the left lower leaf spring group 9, the right upper leaf spring group 8', and the right lower leaf spring group 9' are all composed of several thin leaf springs. The thickness and quantity are determined by the elastic stiffness required by the specific application. The material is beryllium bronze or stainless steel. The internal molding line is precisely processed by photolithography. The internal molding line can be spiral or straight arm. The molding line requirements Smooth, no burrs, no knuckles, and more than 10 ⁸ cycles of fatigue testing through the leaf spring vibration testing machine;

As shown in Figure 8, the schematic diagram of a single-piece thin leaf spring with a spiral inner shape line is etched with a spiral shape line 38 on the sheet by photolithography, thereby naturally forming a spiral shape leaf spring arm 39, leaving a single leaf spring arm 39 outside. Leaf spring outer edge 53, and a number of screw holes 54 for screw fixing are evenly etched on it by photolithography, leaving a single leaf spring inner edge 55 on the inside;

The schematic diagram of a single-piece leaf spring with a straight arm-shaped internal profile is shown in Figure 9. A straight-arm leaf spring arm 56 and a moving arm 57 are etched on the sheet by photolithography, and a single leaf spring is left on the outside. Outer edge 58, and on it, evenly etches some screw holes 59 for screw fixing with photolithography method, leaves the inner edge 60 of monolithic plate spring in the inner side;

Fig. 10 and Fig. 11 are respectively the plane sectional views of the left upper support structure 12 and the left lower support structure 13; the left upper support structure 12 and the left lower support structure 13 are all made of metal materials with higher mechanical strength and lower residual magnetism Manufactured by CNC machine tools, the machining accuracy is better than 5.0 μm; the left side of the left upper support structure 12 is processed into an upper ring-shaped plane 25 using a precision CNC machine tool; the right end surface 24 of the left upper support is supported by the left end surface 19 of the left lower yoke Above, the two are fastened by screws; the lower left support and the right end surface 47 are supported on the left side 48 of the shared machine base, the two are welded together by electron beam welding technology, the left lower support and the left front side 26 are supported on the right end of the left lower yoke On the surface 27, the two are fastened by screws, the lower left side of the left lower support structure 13 is processed with a precision numerical control machine tool to form a lower annular plane 28, and the upper left side of the left lower support structure 13 is processed with a precision numerical control machine tool to produce the outer end surface of the left lower support 52;

Figure 12 is a plane sectional view of the lower support structure 13' on the right; the lower support structure 13' on the right is made of a metal material with high mechanical strength and low residual magnetism by CNC machine tools, and the machining accuracy is better than 5.0 μm. Use a precision numerical control machine tool to process the outer end surface 52' of the lower left support;

Fig. 13 is the plane sectional view of the left part displacement sensor iron core 14; Left part displacement sensor iron core 14 and right part displacement sensor iron core 14 ' are all made of pure iron material, and the inside is respectively processed with left rod threaded section 49 and right rod The threaded section 49' matches the left iron core threaded section 51 and the right iron core threaded section 51', and the left bar threaded section 49 and the right bar threaded section 49' are screwed into the left iron core threaded section 51 and the right iron core threaded section 51 respectively. 'inside and fastened;

The left bobbin 6, the right bobbin 6', the left displacement sensor support 16, and the left displacement sensor support 16' are all made of metal materials with high mechanical strength and low residual magnetism using CNC machine tools. The accuracy is better than 9.0μm; the left displacement sensor coil 15 and the right displacement sensor coil 15' are all wound on the corresponding skeleton by enamelled copper wire;

Figure 14 is a plane sectional view of the left permanent magnet 2; the left permanent magnet 2 and the right permanent magnet 2' are made of rare earth permanent magnet materials with high magnetic energy products, and are processed and formed by laser processing. The left permanent magnet 2 and the right permanent magnet 2' are magnetized axially to saturation using a pulse magnetizer;

Figure 15 is a plane sectional view of the upper yoke 3 on the left; the upper yoke 3 on the left and the upper yoke 3' on the right are made of pure iron materials with high magnetic permeability, processed by precision numerical control machine tools, and the upper yoke on the left The axial thickness of the iron 3 and the right upper yoke 3′ are both δ, and the machining accuracy is better than 2.0 μm;

Figure 16 is a plane sectional view of the lower yoke 4 on the left; the lower yoke 4 on the left and the lower yoke 4' on the right are all made of pure iron materials with high magnetic permeability and processed by precision numerical control machine tools;

Fig. 17 is the schematic diagram of left part current-carrying coil 5; Left part current-carrying coil 5 and right part current-carrying coil 5 ' all adopt enamelled copper wire to be wound on solid support and form, and the diameter and thickness of enameled copper wire are determined by The motor force that needs to be provided is determined; the axial heights of the left current-carrying coil 5 and the right current-carrying coil 5' are both h, and the accuracy of h is guaranteed to be better than 2.0 μm by the precision of the machine tool and the winding process during production;

Figure 18 is a combined plane sectional view of the left permanent magnet 2, the left upper yoke 3, the left lower yoke 4, and the left current-carrying coil 5; the left upper yoke 3 and the left lower yoke 4 combine the left permanent magnet 2 completely wrapped in it to form the left annular air gap 46 together, and the left current-carrying coil 5 is concentrically inserted into the left annular air gap 46; the right upper yoke 3' and the right lower yoke 4' connect the right The permanent magnet 2' is completely wrapped in it, together forming the right annular air gap 46', the right current-carrying coil 5' is concentrically inserted into the right annular air gap 46'; the left upper yoke 3, the left current-carrying coil The coil 5, the left piston 7, the right upper yoke 3', the right current-carrying coil 5', and the right piston 7' all need to meet the following requirements during production: h>s+δ, so as to ensure that during the entire piston stroke , always ensure that the stable magnetic field is within the current-carrying coil;

Fig. 19 and Fig. 20 are the plane sectional views of left part casing 17 and right part casing 17'respectively; Left part casing 17 and right part casing 17' are all made of metal with high mechanical strength, compact structure and low residual magnetism. The material is processed and formed by precision CNC machine tools; the outer end surface 61 of the left casing and the outer end surface 52 of the lower left support are welded together by electron beam technology to form a closed cavity on the left; the outer end surface 61' of the right casing is connected to the outer surface of the lower right support. The end faces 52' are welded together by electron beam technology to form a closed cavity on the right. The above two welded closed cavities are filled with high-purity helium for inspection, and the compressive strength must be higher than 5.0MPa. Helium leakage All rates need to be lower than 3.0×10 ^-8 Pa·m ³ /s.

The advantage of this patent is that the stable, reliable and continuous operation of the moving coil linear compressor is realized by means of long coil and axial magnetization, and it has the outstanding advantages of compact structure, low vibration, high motor efficiency and long expected life. The development of high reliability, long life and high efficiency linear compressor is of great significance.

Description of drawings

Figure 1 is a schematic diagram of four types of moving coil linear motors, in which (1) is the axial magnetization form of the long coil, (2) is the axial magnetization form of the short coil, and (3) is the radial magnetization form of the long coil , (4) is the form of short coil radial magnetization. Wherein 63 is a permanent magnet, 64 is an upper yoke, 65 is a lower yoke, 66 is a current-carrying coil, and 67 is a central through hole;

Fig. 2 is a planar cross-sectional view of the invented opposed moving coil linear compressor adopting axial magnetization of long coils, wherein: 0 is the common base, 1 is the left cylinder liner, 2 is the left permanent magnet, 3 is Left upper yoke, 4 is left lower yoke, 5 is left current-carrying coil, 6 is left coil bobbin, 7 is left piston, 8 is left upper plate spring group, 9 is left lower plate spring group , 10 is the left upper tablet structure, 11 is the left lower tablet structure, 12 is the left upper support structure, 13 is the left lower support structure, 14 is the left displacement sensor core, 15 is the left displacement sensor coil, 16 is the left displacement sensor support, 17 is the left casing; 1' is the right cylinder liner, 2' is the right permanent magnet, 3' is the right upper yoke, 4' is the right lower yoke, 5 ' is the right current-carrying coil, 6' is the right coil bobbin, 7' is the right piston, 8' is the right upper plate spring group, 9' is the right lower plate spring group, 10' is the right upper plate Structure, 11' is the right lower plate structure, 12' is the right upper support structure, 13' is the right lower support structure, 14' is the right displacement sensor core, 15' is the right displacement sensor coil, 16' is Right displacement sensor support, 17' is the right casing;

Fig. 3 is the three-dimensional sectional view of shared machine base 0, and wherein 41 is left cylinder, and 41 ' is right cylinder, and 42 is shared air outlet, and 48 is the left side of shared machine base;

Fig. 4 is a three-dimensional sectional view of the left cylinder liner 1;

Fig. 5 is the plane sectional view of left piston 7, and wherein 35 is left piston head, and 36 is left piston middle transition table, and 37 is left piston rod, and 49 is left rod thread section;

Fig. 6 is a schematic diagram of the combination of the left upper plate spring group 8 and the left upper plate structure 10, wherein 29 is the outer edge of the left upper group, 30 is the inner edge of the left upper group, and the spring body center hole 31 of the left upper group;

Fig. 7 is a schematic diagram of the combination of the left lower plate spring group 9 and the left lower plate structure 11, wherein 32 is the outer edge of the left lower group, 33 is the inner edge of the left lower group, and 34 is the center hole of the left lower group spring body;

Fig. 8 is the schematic diagram of the monolithic thin plate spring whose internal profile is spiral, wherein 38 is the spiral profile, 39 is the spiral leaf spring arm, 53 is the outer edge of the single plate spring, 54 is the screw hole, and 55 is Single leaf spring inner edge;

Fig. 9 is the schematic diagram of the monolithic thin plate spring whose internal profile is straight arm shape, wherein 56 is the straight arm type leaf spring arm, 57 is the movement arm, 58 is the outer edge of the single leaf spring, 59 is the screw hole, and 60 is Single leaf spring inner edge;

Figure 10 is a plane sectional view of the upper support structure 12 on the left, wherein 24 is the right end face of the upper left support, and 25 is the upper annular plane;

Fig. 11 is a plane sectional view of the left lower support structure 13, wherein 26 is the left front side of the left lower support, 28 is the lower annular plane, 47 is the right end face of the left lower support, and 52 is the outer end face of the left lower support;

Fig. 12 is a plane sectional view of the right lower support structure 13', wherein 52' is the outer end surface of the right lower support;

Fig. 13 is a plane sectional view of the left displacement sensor core 14, wherein 51 is a threaded section of the left core;

Fig. 14 is the plane sectional view of left permanent magnet 2, and wherein 21 is the left end face of left permanent magnet; 22 is the right end face of left permanent magnet; 43 is through hole in the left magnet;

Fig. 15 is a plane sectional view of the left upper yoke 3, wherein 18 is the left end face of the left upper yoke; 20 is the right end face of the left upper yoke; 44 is the inner through hole of the left upper yoke;

Fig. 16 is a plane sectional view of the left lower yoke 4, wherein 19 is the left end face of the left lower yoke; 23 is the left end face of the left lower yoke, 27 is the right end face of the left lower yoke; 45 is the inner through hole of the left lower yoke;

Fig. 17 is a schematic diagram of the left current-carrying coil 5;

Fig. 18 is a combined plane sectional view of the left permanent magnet 2, the left upper yoke 3, the left lower yoke 4 and the left current-carrying coil 5, wherein 46 is the left annular air gap;

Figure 19 is a plane sectional view of the left casing 17, wherein 61 is the outer end face of the left casing, and 62 is the left casing;

Fig. 20 is a plane sectional view of the right casing 17', wherein 61' is the outer end surface of the right casing, and 62' is the right casing.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the specific implementation manner of this patent is described in further detail:

The invented opposed moving coil linear compressor adopting long coil axial magnetization consists of a common base 0, a left cylinder liner 1, a left permanent magnet 2, a left upper yoke 3, a left lower yoke 4, Left current-carrying coil 5, left coil bobbin 6, left piston 7, left upper plate spring group 8, left lower plate spring group 9, left upper pressing structure 10, left lower pressing structure 11, left Upper support structure 12, left lower support structure 13, left displacement sensor core 14, left displacement sensor coil 15, left displacement sensor support 16, left casing 17, right cylinder liner 1′, right permanent Magnet 2', right upper yoke 3', right lower yoke 4', right current-carrying coil 5', right bobbin 6', right piston 7', right upper plate spring group 8', right The lower leaf spring group 9', the right upper pressing structure 10', the right lower pressing structure 11', the right upper supporting structure 12', the right lower supporting structure 13', the right displacement sensor core 14', the right The displacement sensor coil 15', the right displacement sensor support 16', and the right casing 17' are composed together. It is characterized in that the overall structure adopts an opposed type to offset the mechanical vibration generated by the left and right parts, that is, it is symmetrical with the vertical center line 40 Shaft, all parts and structural arrangement of the left part and the corresponding parts and structural arrangement of the right part are mirror images of each other; the horizontal axis 50 indicates the axial direction; the common machine base 0 is composed of the left part cylinder 41, the right part cylinder 41' and the common outlet Composed of air holes 42; the left cylinder liner 1 is embedded in the left cylinder 41 with an interference fit, and the right cylinder liner 1' is embedded in the right cylinder 41' with an interference fit; the left permanent magnet 2 is a cylinder shaped structure, the central position is processed with a left magnet internal through hole 43 with a diameter of d along the axial direction; the left upper yoke 3 is a cylindrical structure, and its outer diameter is equal to that of the left permanent magnet 2, and the central position The inner through hole 44 of the left upper yoke with a diameter of d is machined in the axial direction; the left lower yoke 4 is a U-shaped structure, and the inner diameter of the U-shaped body is greater than the outer diameter of the left permanent magnet 2, at the center of the bottom of the U-shaped body The inner through hole 45 of the left lower yoke with a diameter of d is machined in the axial direction; the left permanent magnet 2 is magnetized to saturation in the axial direction, and then the left upper yoke 3 and the left lower yoke 4 connect the left permanent magnet 2 Completely wrapped in it, the left end face 18 of the left upper yoke is flush with the left end face 19 of the left lower yoke, the right end face 20 of the left upper yoke is closely attached to the left end face 21 of the left permanent magnet, and the right end face of the left permanent magnet 22 and the left end surface 23 of the left lower yoke are closely attached together; the left permanent magnet 2, the left upper yoke 3, and the left lower yoke 4 jointly form a left annular air gap 46, and the left current-carrying coil 5 concentrically Inserted into the left annular air gap 46, the right permanent magnet 2', the right upper yoke 3', and the right lower yoke 4' jointly form the right annular air gap 46', and the right current-carrying coil 5' is the same as The center is inserted into the right annular air gap 46'; the axial heights of the left current-carrying coil 5 and the right current-carrying coil 5' are both h; the maximum strokes of the left piston 7 and the right piston 7' are equal is s; the axial thicknesses of the left upper yoke 3 and the right upper yoke 3′ are both δ, and satisfy the relation: h>s+δ, to ensure that the stable magnetic field is always within the current-carrying coil during the entire piston stroke; the upper left support and the right end surface 24 are supported on the left end surface 19 of the left lower yoke, and the two are fastened by screws. The left side of the left upper support structure 12 is processed into an upper annular plane 25; the right end surface 47 of the lower left support is supported on the left side 48 of the common machine base, and the two are welded together; the left front side 26 of the lower left support is supported on the left lower yoke On the right end face 27 of the iron, the two are fastened by screws, and the lower left side of the left lower support structure 13 is processed into a lower annular plane 28; The left upper group outer edge 29 is formed, and the left upper group inner edge 30 is formed on the inner edge, and a left upper group spring center hole 31 with a diameter of d is machined in the axial direction at the central part, wherein the left upper group outer edge 29 is placed on the left upper support structure 12 above the upper annular plane 25, and fastened by screws; the left lower plate spring group 9 is formed by superimposing a number of single leaf spring sheets, forming the outer edge 32 of the lower left group on the outer edge, and the inner edge of the lower left group on the inner edge 33. A central hole 34 of the left lower group spring body with a diameter of d is machined axially at the central part, wherein the outer edge 32 of the left lower group is placed on the lower annular plane 28 of the left lower support structure 13 and fastened by screws; The left piston 7 is made up of the left piston head 35, the left piston middle transition platform 36 and the left piston rod 37, and the left rod thread section 49 with a length of 2mm is processed at the end of the left piston rod 37, and the left piston head 35 The outer diameter of the left cylinder 41 is 20 μm smaller than the inner diameter of the left cylinder 41, while ensuring that the diameter of the left piston rod 37 is less than d; The inner through hole 43 of the left magnet, the inner through hole 44 of the left upper yoke, the center hole 31 of the left upper group spring body; 37 are fastened together, and the left lower plate structure 11 fastens the inner edge 33 of the left lower group and the middle transition table 36 of the left piston together, thereby ensuring that the left current-carrying coil 5, the left coil skeleton 6 and the left piston 7 , the left upper leaf spring group 8, and the left lower leaf spring group 9 are connected as a whole that can move at the same time; the left iron core threaded section 51 matched with the left rod threaded section 49 is processed inside the left displacement sensor iron core 14, The left rod threaded section 49 is screwed into the left iron core threaded section 51 and fastened; the left part displacement sensor coil 15 fastened together with the left part displacement sensor support 16 is set outside the left part displacement sensor iron core 14, and the left part The displacement sensor support 16 is further supported on the left upper support structure 12 and fastened together with it; the left casing 17 is welded and fixed with the left lower support outer end surface 52 through the left casing outer end surface 61, thereby forming a left airtight Cavity, the left cylinder liner 1, the left permanent magnet 2, the left upper yoke 3, the left lower yoke 4, the left current-carrying coil 5, the left coil skeleton 6, the left piston 7, the left Upper leaf spring group 8, left lower leaf spring group 9, left upper pressing structure 10, left lower pressing structure 11, left upper support The support structure 12, the lower supporting structure 13 of the left part, the iron core 14 of the left part displacement sensor, the coil 15 of the left part displacement sensor, the support 16 of the left part displacement sensor, and the left part casing 17 are all covered therein; all the components and structural arrangement of the right part are The corresponding components and structural arrangement on the left are mirror images of the vertical center line 40, and the right casing 17' is welded and fixed by the outer end surface 61' of the right casing and the outer end surface 52' of the lower right support to form a closed cavity on the right. Right cylinder liner 1', right permanent magnet 2', right upper yoke 3', right lower yoke 4', right current-carrying coil 5', right coil bobbin 6', right piston 7' , right upper leaf spring group 8', right lower leaf spring group 9', right upper pressing structure 10', right lower pressing structure 11', right upper supporting structure 12', right lower supporting structure 13', The right displacement sensor core 14', the right displacement sensor coil 15', the right displacement sensor support 16', and the right casing 17' are all covered in it, thereby forming an opposed type that adopts long coil axial magnetization. Dynamic linear compressor.

The invented manufacturing method of the opposed moving coil linear compressor adopting the axial magnetization of the long coil can be implemented as follows:

Fig. 2 is a plane sectional view of the invented opposed moving coil linear compressor adopting long coil axial magnetization; with the vertical center line 40 as the axis of symmetry, all the parts on the left and the corresponding parts on the right that are mirror images of each other need to adopt Parts produced in the same batch to minimize individual variation;

Figure 3 is a three-dimensional sectional view of the shared machine base 0; the shared machine base 0 is made of titanium alloy material with high mechanical strength and small thermal expansion coefficient, and the left cylinder 41 and the right cylinder 41' are simultaneously processed by a five-axis machine tool to ensure that the left cylinder The cylinder 41 and the right cylinder 41' are symmetrical about the vertical center line 40, and the coaxiality between the left cylinder 41 and the right cylinder 41' is guaranteed to be better than 1.0 μm, and the roundness of the inner holes of the above two cylinders is better than 0.5 μm; After the left cylinder 41 and the right cylinder 41 ' are processed, use the same five-axis machine tool to process the shared air outlet 42 to ensure that the verticality of the shared air outlet 42 and the left cylinder 41 and the right cylinder 41 ' is uniform Better than 2.0μm;

Figure 4 is a three-dimensional sectional view of the left cylinder liner 1 (for the left and right parts that are mirror images of each other, generally only the detailed schematic diagram of the left part is given in the drawings, and the manufacturing method is described together with the left and right parts, below The same); the left cylinder liner 1 and the right cylinder liner 1′ are made of mold steel with a hardness greater than 58 and processed into a cylindrical shape by slow wire cutting to ensure that the left cylinder liner 1 and the right cylinder The outer diameter of the bushing 1' is 0.8mm larger than the inner diameter of the left cylinder 41 and the right cylinder 41' respectively, and then it is inserted into the left cylinder 41 and the right cylinder 41' respectively by means of interference fit and thermal expansion and contraction. Inside, the specific inlay method is as follows: place the shared machine base 0 as shown in Figure 3 in a constant temperature heating box with an internal temperature of 160°C and heat it evenly for 5 hours, and 7 minutes before taking out the shared machine base 0 from the constant temperature heating box, put The left cylinder liner 1 and the right cylinder liner 1′ are soaked in liquid nitrogen at the same time, and the left cylinder liner 1 and the right cylinder liner 1’ are taken out from the constant temperature heating box at the same time. Take it out from the liquid nitrogen, and then push the left cylinder liner 1 and the right cylinder liner 1' into the left cylinder 41 and the right cylinder 41' by mechanical external force, so as to ensure that the left cylinder liner 1 and the right The outer wall of the upper cylinder liner 1' is tightly combined with the inner wall of the left cylinder liner 41 and the right liner 41' respectively; then use a coordinate grinder to finely grind the inner holes of the left liner liner 1 and the right liner liner 1' , to ensure that the roundness of the inner hole is better than 0.5 μm;

Figure 5 is a plane sectional view of the left piston 7; both the left piston 7 and the right piston 7' are made of titanium alloy material with high mechanical strength and small thermal expansion coefficient, and the blank is first processed by a numerical control machine tool, and then refined by a jig grinder. Grinding, to ensure that the roundness of the left piston head 35 and the right piston head 35' is better than 0.5 μm, and to ensure that the axial runout of the left piston rod 37 and the right piston rod 37' is less than 3.0 μm, and that the left The verticality of the first piston rod 37 and the left piston head 35 is better than 1.0 μm, and the verticality of the right piston rod 37 ′ and the right piston head 35 ′ is better than 1.0 μm; The end of 37' uses precision numerical control machine tools to process the left rod thread section 49 and the right rod thread section 49' respectively; the maximum stroke of the left piston 7 and the right piston 7' is designed to be s, and the stroke is guaranteed by the limit structure Accuracy better than 2.0μm;

Fig. 6 is a schematic diagram of the combination of the left upper leaf spring group 8 and the left upper pressing structure 10, and Fig. 7 is a combined schematic diagram of the left lower leaf spring group 9 and the left lower pressing structure 11; the left upper pressing structure 10, The lower tablet structure 11 on the left, the upper tablet structure 10' on the right, and the lower tablet structure 11' on the right are all made of metal materials with high mechanical strength and low residual magnetism using CNC machine tools, and the machining accuracy is better than 9.0 μm; the left upper leaf spring group 8, the left lower leaf spring group 9, the right upper leaf spring group 8', and the right lower leaf spring group 9' are all composed of several thin leaf springs. The thickness and quantity are determined by the elastic stiffness required by the specific application. The material is beryllium bronze or stainless steel. The internal molding line is precisely processed by photolithography. The internal molding line can be spiral or straight arm. The molding line requirements Smooth, no burrs, no knuckles, and more than 10 ⁸ cycles of fatigue testing through the leaf spring vibration testing machine;

As shown in Figure 8, the schematic diagram of a single-piece thin leaf spring with a spiral inner shape line is etched with a spiral shape line 38 on the sheet by photolithography, thereby naturally forming a spiral shape leaf spring arm 39, leaving a single leaf spring arm 39 outside. Leaf spring outer edge 53, and a number of screw holes 54 for screw fixing are evenly etched on it by photolithography, leaving a single leaf spring inner edge 55 on the inside;

The schematic diagram of a single-piece leaf spring with a straight arm-shaped internal profile is shown in Figure 9. A straight-arm leaf spring arm 56 and a moving arm 57 are etched on the sheet by photolithography, and a single leaf spring is left on the outside. Outer edge 58, and on it, evenly etches some screw holes 59 for screw fixing with photolithography method, leaves the inner edge 60 of monolithic plate spring in the inner side;

Fig. 10 and Fig. 11 are respectively the plane sectional views of the left upper support structure 12 and the left lower support structure 13; the left upper support structure 12 and the left lower support structure 13 are all made of metal materials with higher mechanical strength and lower residual magnetism Manufactured by CNC machine tools, the machining accuracy is better than 5.0 μm; the left side of the left upper support structure 12 is processed into an upper ring-shaped plane 25 using a precision CNC machine tool; the right end surface 24 of the left upper support is supported by the left end surface 19 of the left lower yoke Above, the two are fastened by screws; the lower left support and the right end surface 47 are supported on the left side 48 of the shared machine base, the two are welded together by electron beam welding technology, the left lower support and the left front side 26 are supported on the right end of the left lower yoke On the surface 27, the two are fastened by screws, the lower left side of the left lower support structure 13 is processed with a precision numerical control machine tool to form a lower annular plane 28, and the upper left side of the left lower support structure 13 is processed with a precision numerical control machine tool to produce the outer end surface of the left lower support 52;

Figure 12 is a plane sectional view of the lower support structure 13' on the right; the lower support structure 13' on the right is made of a metal material with high mechanical strength and low residual magnetism by CNC machine tools, and the machining accuracy is better than 5.0 μm. Use a precision numerical control machine tool to process the outer end surface 52' of the lower left support;

Fig. 13 is the plane sectional view of the left part displacement sensor iron core 14; Left part displacement sensor iron core 14 and right part displacement sensor iron core 14 ' are all made of pure iron material, and the inside is respectively processed with left rod threaded section 49 and right rod The threaded section 49' matches the left iron core threaded section 51 and the right iron core threaded section 51', and the left bar threaded section 49 and the right bar threaded section 49' are screwed into the left iron core threaded section 51 and the right iron core threaded section 51 respectively. 'inside and fastened;

The left bobbin 6, the right bobbin 6', the left displacement sensor support 16, and the left displacement sensor support 16' are all made of metal materials with high mechanical strength and low residual magnetism using CNC machine tools. The accuracy is better than 9.0μm; the left displacement sensor coil 15 and the right displacement sensor coil 15' are all wound on the corresponding skeleton by enamelled copper wire;

Figure 14 is a plane sectional view of the left permanent magnet 2; the left permanent magnet 2 and the right permanent magnet 2' are made of rare earth permanent magnet materials with high magnetic energy products, and are processed and formed by laser processing. The left permanent magnet 2 and the right permanent magnet 2' are magnetized axially to saturation using a pulse magnetizer;

Figure 15 is a plane sectional view of the upper yoke 3 on the left; the upper yoke 3 on the left and the upper yoke 3' on the right are made of pure iron materials with high magnetic permeability, processed by precision numerical control machine tools, and the upper yoke on the left The axial thickness of the iron 3 and the right upper yoke 3′ are both δ, and the machining accuracy is better than 2.0 μm;

Figure 16 is a plane sectional view of the lower yoke 4 on the left; the lower yoke 4 on the left and the lower yoke 4' on the right are all made of pure iron materials with high magnetic permeability and processed by precision numerical control machine tools;

Fig. 17 is the schematic diagram of left part current-carrying coil 5; Left part current-carrying coil 5 and right part current-carrying coil 5 ' all adopt enamelled copper wire to be wound on solid support and form, and the diameter and thickness of enameled copper wire are determined by The motor force that needs to be provided is determined; the axial heights of the left current-carrying coil 5 and the right current-carrying coil 5' are both h, and the accuracy of h is guaranteed to be better than 2.0 μm by the precision of the machine tool and the winding process during production;

Figure 18 is a combined plane sectional view of the left permanent magnet 2, the left upper yoke 3, the left lower yoke 4, and the left current-carrying coil 5; the left upper yoke 3 and the left lower yoke 4 combine the left permanent magnet 2 completely wrapped in it to form the left annular air gap 46 together, and the left current-carrying coil 5 is concentrically inserted into the left annular air gap 46; the right upper yoke 3' and the right lower yoke 4' connect the right The permanent magnet 2' is completely wrapped in it, together forming the right annular air gap 46', the right current-carrying coil 5' is concentrically inserted into the right annular air gap 46'; the left upper yoke 3, the left current-carrying coil The coil 5, the left piston 7, the right upper yoke 3', the right current-carrying coil 5', and the right piston 7' all need to meet the following requirements during production: h>s+δ, so as to ensure that during the entire piston stroke , always ensure that the stable magnetic field is within the current-carrying coil;

Fig. 19 and Fig. 20 are the plane sectional views of left part casing 17 and right part casing 17'respectively; Left part casing 17 and right part casing 17' are all made of metal with high mechanical strength, compact structure and low residual magnetism. The material is processed and formed by precision CNC machine tools; the outer end surface 61 of the left casing and the outer end surface 52 of the lower left support are welded together by electron beam technology to form a closed cavity on the left; the outer end surface 61' of the right casing is connected to the outer surface of the lower right support. The end faces 52' are welded together by electron beam technology to form a closed cavity on the right. The above two welded closed cavities are filled with high-purity helium for inspection, and the compressive strength must be higher than 5.0MPa. Helium leakage All rates need to be lower than 3.0×10 ^-8 Pa·m ³ /s.

Claims (1)

1. An opposed moving-coil linear compressor adopting axial magnetization of long coils, which consists of a common machine base (0), a left cylinder liner (1), a left permanent magnet (2), and a left upper yoke (3), left lower yoke (4), left current-carrying coil (5), left coil bobbin (6), left piston (7), left upper plate spring group (8), left lower plate spring Group (9), left upper pressing structure (10), left lower pressing structure (11), left upper supporting structure (12), left lower supporting structure (13), left displacement sensor core (14) , Left displacement sensor coil (15), left displacement sensor support (16), left casing (17) and right cylinder liner (1′), right permanent magnet (2′), right upper yoke Iron (3′), right lower yoke (4′), right current-carrying coil (5′), right coil bobbin (6′), right piston (7′), right upper plate spring group (8 ′), the right lower plate spring group (9’), the right upper plate structure (10’), the right lower plate structure (11’), the right upper support structure (12’), the right lower support structure (13 '), the right displacement sensor core (14'), the right displacement sensor coil (15'), the right displacement sensor support (16') and the right casing (17'), characterized in that the overall structure The opposite type is used to offset the mechanical vibration generated by the left and right parts, that is, with the vertical centerline (40) as the axis of symmetry, all components and structural arrangements on the left and the corresponding components and structural arrangements on the right are mirror images of each other; the horizontal axis (50) The direction indicated is the axial direction; the common base (0) is composed of the left cylinder (41), the right cylinder (41′) and the common air outlet (42); the left cylinder bushing (1) is embedded in the interference fit Inside the left cylinder (41), the right cylinder bushing (1′) is embedded in the inside of the right cylinder (41′) with an interference fit; the left permanent magnet (2) is a cylindrical structure, and the center position is along the shaft There is a through hole (43) in the left magnet with a diameter of d; the left upper yoke (3) is a cylindrical structure, its outer diameter is equal to that of the left permanent magnet (2), and the center position is along the The inner through hole (44) of the left upper yoke with diameter d is axially processed; the left lower yoke (4) is a U-shaped structure, and the inner diameter of the U-shaped body is greater than the outer diameter of the left permanent magnet (2). The central position of the bottom of the body is axially processed with a left lower yoke inner through hole (45) with a diameter of d; the left permanent magnet (2) is magnetized to saturation in the axial direction, and then the left upper yoke (3) and The left lower yoke (4) completely wraps the left permanent magnet (2), the left end face (18) of the left upper yoke is flush with the left end face (19) of the left lower yoke, and the right end face of the left upper yoke ( 20) Cling together with the left end surface of the left permanent magnet (21), and the right end surface (22) of the left permanent magnet and the left end surface (23) of the left lower yoke are close together; the left permanent magnet (2), the left The upper yoke (3) and the lower left yoke (4) jointly form the left annular air gap (46), the left current-carrying coil (5) is concentrically inserted into the left annular air gap (46), and the right department The permanent magnet (2'), the upper right yoke (3'), and the lower yoke (4') together form the right annular air gap (46'), and the right current-carrying coil (5') is inserted concentrically In the right annular air gap (46'); the axial heights of the left current-carrying coil (5) and the right current-carrying coil (5') are both h; the left piston (7) and the right piston (7 ′) The maximum stroke during work is both s; the axial thicknesses of the left upper yoke (3) and the right upper yoke (3′) are both δ, and satisfy the relationship: h>s+δ, to ensure that During the entire piston stroke, always ensure that the stable magnetic field is within the current-carrying coil; the upper left support and the right end surface (24) are supported on the left end surface (19) of the left lower yoke iron, the two are fastened by screws, and the left upper support structure The left side of (12) is processed into an upper annular plane (25); the lower left support right end face (47) is supported on the left side (48) of the shared machine base, and the two are welded together; the lower left support left front side (26) It is supported on the right end surface (27) of the left lower yoke, and the two are fastened by screws, and the left lower side of the left lower support structure (13) is processed into a lower annular plane (28); the left upper plate spring group (8) It is formed by stacking a number of single leaf spring sheets, forming the upper left group outer edge (29) on the outer edge, forming the upper left group inner edge (30) on the inner edge, and processing the upper left group spring body with a diameter of d in the center along the axial direction The center hole (31), wherein the left upper group outer edge (29) is placed on the upper annular plane (25) of the left upper support structure (12), and is fastened by screws; the left lower plate spring group 9 consists of several single Laminated spring sheets are superimposed, the outer edge of the left lower group (32) is formed on the outer edge, the inner edge of the left lower group (33) is formed on the inner edge, and a center hole of the left lower group spring body with a diameter of d is machined in the center along the axial direction ( 34), wherein the left lower group outer edge (32) is placed on the lower annular plane (28) of the left lower support structure (13), and is fastened by screws; the left piston (7) is fixed by the left piston head (35) ), the middle transition table (36) of the left piston and the left piston rod (37), the end of the left piston rod (37) is processed with a left rod thread section (49) with a length of 1-3mm, and the left piston head The outer diameter of (35) is 10-30 μm smaller than the inner diameter of the left cylinder (41), while ensuring that the diameter of the left piston rod (37) is smaller than d; the left piston rod (37) passes through the center hole of the left lower spring body in turn (34), the inner through hole of the left lower yoke (45), the inner through hole of the left magnet (43), the inner through hole of the left upper yoke (44), the center hole of the spring body of the upper left group (31); The pressing structure (10) fastens the inner edge of the left upper group (30) and the left coil bobbin (6) and the left piston rod (37), and the left lower pressing structure (11) fastens the inner edge of the left lower group (33) ) and the middle transition table (36) of the left piston are fastened together, so as to ensure ), the left lower plate spring group (9) is connected as a whole that can move at the same time; the iron core of the left displacement sensor (14 ) is internally processed with a left iron core threaded section (51) matching the left rod threaded section (49), and the left rod threaded section (49) is screwed into the left iron core threaded section (51) and fastened; The left displacement sensor coil (15) fastened with the left displacement sensor support (16) is set outside the sensor core (14), and the left displacement sensor support (16) is further supported on the left upper support structure (12 ) and fastened together with it; the left casing (17) is fixed by welding the outer end surface of the left casing (61) and the outer end surface of the left lower support (52), thereby forming a left airtight cavity, and the left Cylinder liner (1), left permanent magnet (2), left upper yoke (3), left lower yoke (4), left current-carrying coil (5), left coil bobbin (6), left Piston (7), left upper leaf spring group (8), left lower leaf spring group (9), left upper pressing structure (10), left lower pressing structure (11), left upper supporting structure ( 12), the left lower support structure (13), the left displacement sensor core (14), the left displacement sensor coil (15), the left displacement sensor support (16), and the left casing (17) are all covered in it ;All parts and structural arrangement on the right part are mirror images of the corresponding parts and structural arrangement on the left part with respect to the vertical center line (40), and the right part of the casing (17') is supported by the outer end surface of the right part of the casing (61') and the lower right The outer end surface (52') is welded and fixed to form a right airtight cavity, the right cylinder liner (1'), the right permanent magnet (2'), the right upper yoke (3'), and the right lower yoke (4′), right current-carrying coil (5′), right coil bobbin (6′), right piston (7′), right upper leaf spring group (8′), right lower leaf spring group (9 ′), right upper plate structure (10’), right lower plate structure (11’), right upper support structure (12’), right lower support structure (13’), right displacement sensor core ( 14'), the right displacement sensor coil (15'), the right displacement sensor support (16'), and the right casing (17') are all covered in it, thus forming a pair of long coils axially magnetized Mounted moving coil linear compressor.

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