Linear compressor with electromagnetic spring

Abstract

The invention provides a linear compressor with an electromagnetic spring, which comprises a main machine body, a compression vibrator component which is arranged in the main machine body and consists of a compression piston and a permanent magnet, and a stator component which consists of an inner soft magnet sleeved on the outer wall of a cylinder sleeve, a coil rack fixed on the main machine body and a coil in the coil rack, the electromagnetic spring is characterized in that an electromagnetic spring is arranged in the main machine body, the electromagnetic spring comprises a first outer soft magnet arranged on the outer wall of the permanent magnet and a second outer soft magnet arranged outside the coil, and a stable magnetic field is formed by the inner soft magnet, the permanent magnet, the first outer soft magnet, the second outer soft magnet and the coil. And a compression vibrator component consisting of a compression piston and a permanent magnet is magnetically suspended in a piston cavity in the main machine body to form an electromagnetic spring. The compressor structure and assembly procedures are simplified, the size is smaller, reliability is high, the service life is long, and the working efficiency of the compressor is improved.

Description

Technical Field

[0001] The invention relates to a linear compressor, in particular to a linear compressor with an electromagnetic spring, and belongs to the technical field of compressor design and manufacturing. Background Art

[0002] The compressor of the ultra-small Stirling refrigerator used in high-operating-temperature infrared detection devices HOT is required to develop in the direction of miniaturization, lightness, and high efficiency. Among them, the important supporting parts are the key to the technology. The existing technology usually uses leaf springs, coil springs or gas bearings to radially support the compression vibrator components. Among them: when the leaf spring is supported, the axial stiffness is much greater than the radial stiffness, which is the most significant feature of the leaf spring. It is often necessary to weld multiple leaf springs together, and sufficient axial space needs to be reserved to ensure that the leaf spring supports the reciprocating motion of the compression vibrator component, so the axial size is relatively large; when the coil spring is supported, it is affected by the thermal expansion of the material and will introduce lateral force to the piston; and both the leaf spring and the coil spring have fatigue failure problems. At the same time, when the compressor is not working, it is difficult to limit the vibrator component to the initial position and to ensure that the state is the same each time it is turned on. After the compressor is powered on, during its operation, the power suddenly increases or is subjected to a large impact vibration, which will cause the vibrator component to exceed the effective stroke and easily cause the risk of hitting the cylinder. In addition, it also increases the complexity of the compressor structure and assembly process, as well as the manufacturing cost; when the gas bearing is supported, the throttle hole and the like are important structures that affect the performance of the gas bearing, and it is also necessary to ensure that there is a layer of air film between it and the inner wall of the cylinder, resulting in a more complex structure, and there are certain restrictions on the radial size of the piston, and the manufacturing cost is high. Therefore be necessary to improve the prior art. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies in the existing technology, the present invention provides a miniaturized linear compressor with an electromagnetic spring that can achieve resonant motion, so as to meet the requirements of a refrigerator for HOT devices with a simple structure, low cost, high reliability and long life.

[0004] The present invention is completed through the following technical scheme: a linear compressor with an electromagnetic spring, comprising a main body, a compression vibrator component composed of a compression piston and a permanent magnet arranged in the main body, and a stator component composed of an inner soft magnet sleeved on the outer wall of the cylinder sleeve, and a coil frame fixed on the main body and the coil inside. It is characterized in that an electromagnetic spring is arranged in the main body, and the electromagnetic spring includes a first outer soft magnet arranged on the outer wall of the permanent magnet, and a second outer soft magnet arranged outside the coil, so that the compression vibrator component composed of the compression piston and the permanent magnet is magnetically suspended in the piston cavity in the main body through a stable magnetic field composed of the inner soft magnet, the permanent magnet, the first outer soft magnet, the second outer soft magnet and the coil, thereby forming an electromagnetic spring, effectively avoiding the compression piston of the compression vibrator component from contacting with the inner wall of the cylinder to cause wear.

[0005] The first external soft magnetic material and the second external soft magnetic material are both made of low magnetic resistance and high magnetic permeability materials, which can effectively gather the excitation magnetic field generated after the coil is energized, thereby improving the efficiency of the linear compressor.

[0006] The axial length of the permanent magnet is smaller than the axial lengths of the inner soft magnet, the second outer soft magnet and the second outer soft magnet, so as to form a short magnet and long yoke structure.

[0007] The compression piston of the compression vibrator component includes an inner sleeve arranged in the cylinder sleeve, and an outer sleeve arranged outside the cylinder sleeve. The permanent magnet is fixed on the outer sleeve of the compression piston, and an inner soft magnet is arranged in the gap between the outer sleeve and the outer wall of the cylinder sleeve, so that the compression vibrator component composed of the compression piston and the permanent magnet is magnetically suspended in the piston cavity in the main body in the stable magnetic field generated by the interaction between the constant magnetic field generated by the permanent magnet and the alternating magnetic field generated by the coil being energized.

[0008] The main body is provided with an air outlet and an air inlet, which are connected to the existing expander through corresponding connecting pipes, so that the high-pressure gas generated by the inward squeezing of the compression piston can be sent to the expander through the air outlet and the connecting pipe, or when the compression piston moves outward, the high-pressure gas is sucked from the expander into the piston cavity through the connecting pipe. Through the periodic movement of the compression piston, a periodic pressure wave is formed in the piston cavity, driving the expander to achieve refrigeration.

[0009] Sealing end covers are respectively arranged at both ends of the main body.

[0010] Compared with the prior art, the present invention has the following advantages and effects: by adopting the above technical scheme, the compression vibrator component composed of the compression piston and the permanent magnet can be conveniently suspended in the cylinder in the main body through the stable magnetic field composed of the inner soft magnet, the permanent magnet, the first outer soft magnet, the second outer soft magnet and the coil, effectively avoiding the wear caused by the contact between the compression piston of the compression vibrator component and the inner wall of the cylinder, and then through the interaction between the constant magnetic field generated by the permanent magnet and the alternating magnetic field generated by the coil being energized, a periodic electromagnetic force is generated, which can drive the compression piston to reciprocate in the cylinder in the main body, so that the compressed working medium gas is sent out through the air delivery hole, thereby improving the working efficiency of the compressor, making the compressor structure simpler and smaller in size, and no longer failing due to mechanical fatigue, further improving the reliability and service life of the compressor, reducing the number of compressor parts, and simplifying the compressor assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 BB cross-sectional view. DETAILED DESCRIPTION

[0012] The present invention is further described below in conjunction with the accompanying drawings given in accordance with the embodiments. Example

[0013] The linear compressor with electromagnetic spring provided by the present invention comprises a main body 1, a compression vibrator component composed of a compression piston 6 and a permanent magnet 3 symmetrically arranged in the main body 1, and a stator component composed of an inner soft magnet 2 symmetrically sleeved on the outer wall of a cylinder sleeve 8, and a coil frame 9 symmetrically fixed on the main body 1 and a coil 11 therein, wherein electromagnetic springs are symmetrically arranged in the main body 1, and the electromagnetic springs include a first outer soft magnet 4 arranged on the outer wall of the permanent magnet 3, and a second outer soft magnet 5 arranged outside the coil 11, so that the compression vibrator component composed of the compression piston 6 and the permanent magnet 3 is magnetically suspended in the air cavity 7 in the main body 1 in a stable magnetic field formed by the inner soft magnet 2, the permanent magnet 3, the first outer soft magnet 4, the second outer soft magnet 5 and the coil 11, thereby forming an electromagnetic spring, effectively avoiding the compression piston 6 of the compression vibrator component from contacting with the inner wall of the cylinder to generate wear.

[0014] The first external soft magnetic material 4 and the second external soft magnetic material 5 are both made of low magnetic resistance and high magnetic permeability materials, which can effectively gather the excitation magnetic field generated after the coil 11 is energized, thereby improving the efficiency of the linear compressor.

[0015] The axial length of the permanent magnet 3 is smaller than the axial lengths of the inner soft magnet 2 , the second outer soft magnet 4 and the second outer soft magnet 5 , so as to form a short magnet and long yoke structure.

[0016] The compression piston 6 of the compression vibrator component includes an inner sleeve arranged in the cylinder sleeve 8, and an outer sleeve arranged outside the cylinder sleeve 8. The permanent magnet 3 is fixed on the outer sleeve of the compression piston 6, and the inner soft magnet 2 is arranged in the gap between the outer sleeve and the outer wall of the cylinder sleeve 8, so that the compression vibrator component composed of the compression piston 6 and the permanent magnet 3 is magnetically suspended in the piston cavity 7 in the main body 1 in the stable magnetic field generated by the interaction between the constant magnetic field generated by the permanent magnet 3 and the alternating magnetic field generated by the energization of the coil 11; The two ends of the main body 1 are respectively provided with sealing end covers 10; The main body 1 is provided with an air outlet 12 and an air inlet 13, which are connected to the existing expander through corresponding connecting pipes, so that the high-pressure gas generated by the inward squeezing of the compression piston can be sent to the expander through the air outlet 12 and the connecting pipe, or when the compression piston moves outward, the high-pressure gas is sucked from the expander into the piston chamber 7 through the connecting pipe. Through the periodic movement of the compression piston, a periodic pressure wave is formed in the piston chamber 7, driving the expander to achieve refrigeration.

Claims

1. A linear compressor with electromagnetic spring, comprising a main body, a compression vibrator component composed of a compression piston and a permanent magnet arranged in the main body, and a stator component composed of an inner soft magnet sleeved on the outer wall of a cylinder sleeve, a coil frame fixed on the main body and a coil inside the stator, characterized in that An electromagnetic spring is arranged in the main body, and the electromagnetic spring includes a first outer soft magnet arranged on the outer wall of the permanent magnet, and a second outer soft magnet arranged outside the coil. Through the stable magnetic field formed by the inner soft magnet, the permanent magnet, the first outer soft magnet, the second outer soft magnet and the coil, the compression vibrator component composed of the compression piston and the permanent magnet is magnetically suspended in the piston cavity in the main body to form an electromagnetic spring.

2. The linear compressor with electromagnetic spring according to claim 1, characterized in that The first external soft magnetic material and the second external soft magnetic material are both made of low magnetic resistance and high magnetic permeability materials.

3. The linear compressor with electromagnetic spring according to claim 1, characterized in that The axial length of the permanent magnet is smaller than the axial lengths of the inner soft magnet, the second outer soft magnet and the second outer soft magnet.

4. The linear compressor with electromagnetic spring according to claim 1, characterized in that The compression piston of the compression vibrator component includes an inner sleeve arranged in the cylinder sleeve, and an outer sleeve arranged outside the cylinder sleeve. The permanent magnet is fixed on the outer sleeve of the compression piston, and an inner soft magnet is arranged in the gap between the outer sleeve and the outer wall of the cylinder sleeve, so that the compression vibrator component composed of the compression piston and the permanent magnet is magnetically suspended in the piston cavity in the main body in the stable magnetic field generated by the interaction between the constant magnetic field generated by the permanent magnet and the alternating magnetic field generated by the coil being energized.

5. The linear compressor with electromagnetic spring according to claim 1, characterized in that The main body is provided with an air outlet and an air inlet, and the air outlet and the air inlet are connected to the expander through corresponding connecting pipes.

6. The linear compressor with electromagnetic spring according to claim 1, characterized in that Sealing end covers are respectively arranged at both ends of the main body.

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