CN210669849U - Linear compressor - Google Patents

Abstract

The utility model provides a linear compressor, including casing, cylinder, piston and linear motor, linear motor includes stator and active cell, linear compressor still includes at least one first resonance spring, at least one second resonance spring and at least one third resonance spring that the extending direction is on a parallel with the linear motor axis; two ends of the first resonance spring are respectively connected with a first axial end of the stator and a first mounting part of the rotor; two ends of the second resonance spring are respectively connected with a second mounting part of the rotor and a resonance plate; the two ends of the third resonance spring are respectively connected with the resonance plate and a fixing plate; the second mounting portion is closer to the first axial end than the first mounting portion and the resonance plate are, and the resonance plate is closer to the first axial end than the fixed plate is, in the axial direction of the linear motor; the resonance plate is movable with the second resonance spring and the third resonance spring, and the fixing plate is directly or indirectly fixed to the cabinet. The utility model discloses linear compressor's axial dimension has been reduced.

Description

Linear compressor

Technical Field

The utility model relates to a compressor technical field especially relates to a linear compressor.

Background

The linear compressor is a piston type compressor to which a linear motor including a stator and a mover is applied. The rotor makes linear reciprocating motion along the axial direction to drive the piston to reciprocate in the cylinder and compress the refrigerant in the cylinder.

The existing linear compressor has a large axial size, and is not beneficial to being arranged in small refrigeration equipment (such as a refrigerator and a freezer) with a very narrow space. In particular, in the case of vertical linear compressors (the axis of the linear motor extends in the vertical direction), the axial dimensions are large, i.e. the height is high, and in order to accommodate a high linear compressor, it is necessary to increase the overall height of the refrigeration equipment, or to reduce the effective volume of the refrigeration space, or both. At the same time, the elevation of the linear compressor also raises its center of gravity, resulting in greater vibration and noise.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a reduce linear compressor's axial dimension to do benefit to and arrange in refrigeration plant, and reduce vibration and noise.

Particularly, the utility model provides a linear compressor, it includes casing, cylinder, piston and linear motor, and linear motor includes stator and active cell, and linear compressor still includes at least one first resonance spring, at least one second resonance spring and at least one third resonance spring that the extending direction is on a parallel with the linear motor axis; wherein

Two ends of the first resonance spring are respectively connected with a first axial end of the stator and a first mounting part of the rotor;

two ends of the second resonance spring are respectively connected with a second mounting part of the rotor and a resonance plate;

the two ends of the third resonance spring are respectively connected with the resonance plate and a fixing plate;

the second mounting portion is closer to the first axial end than the first mounting portion and the resonance plate are, in the linear motor axis direction, closer to the first axial end than the fixed plate is;

the resonance plate is movable with the second resonance spring and the third resonance spring, and the fixing plate is directly or indirectly fixed to the cabinet.

Alternatively, the connection point of the resonator plate with the second resonant spring is closer to the first axial end than the connection point with the third resonant spring.

Optionally, in a radial direction of the linear motor, the at least one second resonant spring is closer to a central axis of the linear motor than the at least one first resonant spring; and each third resonant spring is coaxially arranged with one second resonant spring.

Optionally, the number of the at least one second resonant spring and the number of the at least one third resonant spring are all multiple, and the multiple second resonant springs and the multiple third resonant springs are respectively and uniformly distributed on respective distribution circles, and the centers of the distribution circles all fall on the central axis of the linear motor.

Optionally, a connection point of the resonator plate with the third resonant spring is closer to the first axial end than a connection point thereof with the second resonant spring.

Optionally, in a radial direction of the linear motor, the at least one second resonant spring is closer to a central axis of the linear motor than the at least one first resonant spring; and each third resonant spring is coaxially arranged with one first resonant spring.

Optionally, the number of the at least one first resonant spring, the number of the at least one second resonant spring, and the number of the at least one third resonant spring are all plural, and the plural first resonant springs, the plural second resonant springs, and the plural third resonant springs are respectively and uniformly distributed on respective distribution circles, and the circle centers of the distribution circles are located on the central axis of the linear motor.

Optionally, in the radial direction of the linear motor, the at least one second resonant spring and the at least one third resonant spring are not arranged coaxially and are each closer to the central axis of the linear motor than the at least one first resonant spring.

Alternatively, the linear compressor is of a vertical structure, and the axis of the linear motor extends in a vertical direction.

Optionally, the cylinder is located below the stator; the first axial end is the upper end of the stator; the stator comprises an inner stator and an outer stator which are cylindrical and coaxially arranged, the outer stator is positioned at the radial outer side of the inner stator, and an annular gap is formed between the outer stator and the inner stator; the rotor comprises an annular magnet and a rotor framework, the annular magnet is positioned in the annular gap, the rotor framework comprises an outer cylinder part connected to the annular magnet, an inner cylinder part extending into the inner stator and connected to the piston, and a first installation part and a second installation part are further formed on the rotor framework.

The utility model discloses an among the linear compressor, in the linear motor axis direction, first installation department and resonance board are compared to the second installation department and are more close first axial end, and the resonance board is compared the fixed plate and is more close first axial end, and this makes first resonance spring and second resonance spring have the overlapping of certain distance on length direction, has shortened the axial total length that multiunit resonance spring occupied, has reduced linear compressor's axial dimensions. Is very convenient to be arranged in small-sized refrigeration equipment (such as a refrigerator and a freezer). For a vertical linear compressor, the reduction in axial dimensions also makes the compressor shorter, the centre of gravity is lowered, and vibration and noise problems are ameliorated.

And, the utility model discloses do not reduce linear compressor's axial dimensions through the group number that reduces resonant spring, make the resonance system still exert high-quality resonance function.

Further, the utility model discloses a linear compressor makes the resonator plate compare its tie point with second resonance spring with third resonance spring's tie point and is closer to the first axial end of stator, namely makes second resonance spring and third resonance spring have the overlapping of certain distance on length direction, and this has further shortened the axial total length that multiunit resonance spring occupied, has reduced linear compressor's axial dimension.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic cross-sectional view of a linear compressor according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a linear compressor according to another embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a linear compressor according to still another embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic cross-sectional view of a linear compressor according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a linear compressor. The linear compressor may be applied to a vapor compression refrigeration cycle system, such as a refrigerator or freezer, for compressing a refrigerant.

As shown in fig. 1, the linear compressor may generally include a casing 100, a linear motor 700, a cylinder 200, and a piston 300.

The casing 100 defines a receiving chamber and is mounted with a suction pipe (not shown) and a discharge pipe (not shown). The linear motor 700 is installed in the cabinet 100, and includes a stator 720 and a mover 710. The stator 720 is directly or indirectly fixed to the casing 100. When the linear motor 700 is powered on, an electromagnetic force is generated between the stator 720 and the mover 710, and the mover 710 linearly reciprocates relative to the stator 720 by the electromagnetic force.

The cylinder 200 is disposed in the casing 100, and defines a space for compressing refrigerant, i.e., a compression chamber 201. The piston 300 is linearly reciprocated in the axis (x-axis) direction of the linear motor 700 by the mover 710 to compress the refrigerant in the cylinder 200. The end of the cylinder 200 is also mounted with a discharge valve 210, and the piston 300 compresses the refrigerant in the cylinder 200, i.e., performs a compression process, when moving toward the discharge valve 210. When the pressure of the refrigerant gas is sufficiently high, the exhaust valve 210 is pushed open to exhaust the gas, and the exhaust process is performed. Then, the piston 300 changes its moving direction to move away from the discharge valve 210, and the cylinder 200 sucks the low-pressure refrigerant and performs a suction process. The processes of suction, compression, and exhaust of the cylinder 200 are cyclically performed.

The linear compressor further includes three or more rows of resonant springs. When the linear compressor is operated, the resonant spring, the mover 720 and the piston 300 form a vibration system, and when the operation frequency of the linear compressor reaches or approaches to the resonance frequency of the vibration system, the linear compressor can obtain higher energy efficiency, and the vibration and noise of the compressor can be lower. Resonant systems are widely used in linear compressors and the principle thereof will not be described too much here.

For example, as shown in fig. 1, three sets of resonant springs, respectively, at least one first resonant spring 810, at least one second resonant spring 820, and at least one third resonant spring 830, which extend in parallel to the axis of the linear motor 700, may be provided. The mover 710 is provided with a first mounting portion 7121 for mounting the first resonant spring 810 and a second mounting portion 7122 for mounting the second resonant spring 820. Both ends of each of the first resonant springs 810 are respectively connected to the first axial end of the stator 720 and the first mounting portion 7121 of the mover 710. Both ends of each second resonant spring 820 are respectively connected to the second mounting portion 7122 of the mover 710 and a resonant plate 400. Both ends of each of the third resonant springs 830 are connected to the resonator plate 400 and a fixing plate 500, respectively. The resonance plate 400 is movable with the second and third resonance springs 820 and 830, that is, the resonance plate 400 is connected only with the second and third resonance springs 820 and 830, and has a main function of absorbing vibration of the second and third resonance springs 820 and 830. The fixed plate 500 is directly or indirectly fixed to the cabinet 100, and does not follow the third resonant spring 830.

In the linear motor axis (x-axis) direction, the second mounting portion 7122 is closer to the first axial end of the stator 720 than the first mounting portion 7121 and the resonance plate 400, and the resonance plate 400 is closer to the first axial end of the stator 720 than the fixed plate 500, that is, the first resonance spring 810 and the second resonance spring 820 are overlapped with a certain distance in the length direction. Compare in adjacent resonance spring arrange in proper order and the scheme that does not overlap the setting along the axial, this embodiment has undoubtedly shortened the axial total length that multiunit resonance spring occupied, has reduced linear compressor's axial dimension, does benefit to very much and arranges in small-size refrigeration plant (like refrigerator, freezer). Furthermore, the embodiment of the utility model provides a do not reduce linear compressor's axial dimensions through the group number that reduces resonant spring, make the resonance system still exert high-quality resonance function.

For example, as shown in fig. 1, the linear compressor may be of a vertical configuration, i.e., the x-axis extends in a vertical direction. The first resonant spring 810 and the second resonant spring 820 extend in a vertical direction in a length direction, and a lowest point of the second resonant spring 820 is lower than a highest point of the first resonant spring 810, so that the first resonant spring and the second resonant spring are overlapped with a certain distance in a height direction, and thus the linear compressor is shorter, has a lower center of gravity, and is improved in vibration and noise problems.

Of course, the linear compressor may also be a horizontal structure (x-axis extending horizontally), and will not be described in detail.

In some embodiments, as shown in fig. 1, the connection point of the resonator plate 400 to the second resonant spring 820 may be closer to the first axial end of the stator 720 than to the third resonant spring 830. That is, the second resonant spring 820 and the third resonant spring 830 are not overlapped in the length direction. That is, in the vertical type linear compressor, the second resonant spring 820 is connected to the bottom surface of the resonance plate 400, and the third resonant spring 830 is connected to the top surface of the resonance plate 400 so as not to overlap in the longitudinal direction. And, in the radial direction of the linear motor 700, at least one second resonant spring 820 is closer to the central axis x axis of the linear motor 700 than at least one first resonant spring 810, and each third resonant spring 830 is coaxially disposed with one second resonant spring 820.

The number of the at least one second resonant spring 820 and the number of the at least one third resonant spring 830 may be a plurality, and the plurality of the at least one second resonant spring 820 and the at least one third resonant spring 830 are uniformly distributed on respective distribution circles, and the centers of the distribution circles are located on the central axis of the linear motor 700. So that the resonant springs more uniformly and dispersedly support the mover 710, reduce unnecessary deformation of the resonant springs and unnecessary radial misalignment of the mover 710, and make the movement thereof more accurate.

As shown in fig. 1, one or more positioning pins 610 may be used to pass through the holes of the fixed plate 500, the resonator plate 400, and the mover 710 to restrain the resonator plate 400 so that it can vibrate reciprocally only in the axial direction of the positioning pins 610, thereby preventing deflection.

As shown in fig. 1, the stator 720 includes an inner stator 722 and an outer stator 721, both of which are cylindrical and coaxially disposed. The outer stator 721 is positioned radially outward of the inner stator 722 with an annular gap 701 therebetween. The inner stator 722 is provided with a coil 723. The cylinder 200 is located below the stator 720, and the first resonant spring 810 is mounted at an upper end of the stator 720 (i.e., the first axial end is the upper end of the stator 720). The mover 710 includes a ring magnet 711 and a mover frame 712. A ring magnet 711 is located in the annular gap 701 for generating electromagnetic force with the stator 720. When the linear motor 700 is powered on, the ring magnet 711 reciprocates by an electromagnetic force. The mover frame 712 includes an outer cylinder portion 7124 coupled to the ring magnet 711, and a central through hole 702 extended into the inner stator 722 to be coupled to the inner cylinder portion 7126 of the piston 300. The first mounting portion 7121 and the second mounting portion 7122 are also formed on the mover frame 712. The inner tube portion 7126, the outer tube portion 7124, the first mounting portion 7121 and the second mounting portion 7122 may be integrally formed or assembled.

As shown in fig. 1, a flange 220 may be further provided, which is fixed to the casing 100 and has an inner hole. The upper end of the flange 220 abuts against the lower end of the stator 720. The cylinder 200 is fixed in the inner hole of the flange 220. The cover plate 230 covers the bottom of the cylinder 200 to form an exhaust chamber 231. The linear compressor may have a low back pressure structure, the cylinder 200 sucks a low pressure refrigerant from the inside of the casing 100, and the air flow of the discharge chamber 231 communicates with a discharge pipe of the casing 100 to discharge a high pressure gas. In some alternative embodiments, the linear compressor may also be of a medium-back pressure or high-back pressure structure, and the specific arrangement is well known to those skilled in the art and will not be described herein.

Fig. 2 is a schematic cross-sectional view of a linear compressor according to another embodiment of the present invention.

As shown in fig. 2, in other embodiments, the coupling point of the resonator plate 400 to the third resonant spring 830 is closer to the first axial end of the stator 720 than to the second resonant spring 820. That is, the second resonant spring 820 and the third resonant spring 830 are overlapped with a certain distance in the length direction, which further shortens the total axial length occupied by the plurality of sets of resonant springs, reducing the axial size of the linear compressor.

For example, as shown in fig. 2, the resonator plate 400 is provided with a lower first half 410 and an upper second half 420. The bottom end of the third resonant spring 830 is connected to the first half 410, and the top end of the second resonant spring 820 is connected to the second half 420, so that the lowest point of the third resonant spring 830 is lower than the highest point of the second resonant spring 820.

Further, as shown in fig. 2, in the radial direction of the linear motor, at least one second resonant spring 820 is closer to the central axis x axis of the linear motor 700 than at least one first resonant spring 810, and each third resonant spring 830 is coaxially disposed with one first resonant spring 810. The number of the at least one first resonant spring 810, the number of the at least one second resonant spring 820, and the number of the at least one third resonant spring 830 may be multiple and are uniformly distributed on respective distribution circles, and the center of each distribution circle is located on the axis x of the central axis of the linear motor 700, so that the resonant springs uniformly and dispersedly support the mover 710, unnecessary deformation of the resonant springs and unnecessary radial displacement of the mover 710 are reduced, and the movement of the mover 710 is more accurate.

As shown in fig. 2, one or more positioning pins 620 may be used to pass through the holes of the fixing plate 500, the resonator plate 400, and the stator 720 to restrain the resonator plate 400 from vibrating back and forth only in the axial direction of the positioning pins 620, thereby preventing deflection.

Fig. 3 is a schematic cross-sectional view of a linear compressor according to still another embodiment of the present invention.

As shown in fig. 3, in further embodiments, the coupling point of the resonator plate 400 to the third resonant spring 830 is closer to the first axial end of the stator 720 than to the second resonant spring 820. That is, the second resonant spring 820 and the third resonant spring 830 are overlapped with a certain distance in the length direction, which further shortens the total axial length occupied by the plurality of sets of resonant springs, reducing the axial size of the linear compressor.

For example, as shown in fig. 3, the resonator plate 400 is provided with a first lower half 410 and a second upper half 420. The bottom end of the third resonant spring 830 is connected to the first half 410, and the top end of the second resonant spring 820 is connected to the second half 420, so that the lowest point of the third resonant spring 830 is lower than the highest point of the second resonant spring 820.

Further, as shown in fig. 3, in the radial direction of the linear motor 700, at least one second resonant spring 820 and at least one third resonant spring 830 are not arranged coaxially and are each closer to the central axis x-axis of the linear motor 700 than at least one first resonant spring 810.

A plurality of first resonant springs 810, one second resonant spring 820, and one third resonant spring 830 may be provided. The plurality of first resonant springs 810 are uniformly distributed on a distribution circle, and the center of the distribution circle is located on the axis x of the central axis of the linear motor 700, so that the resonant springs uniformly and dispersedly support the mover 710, unnecessary deformation of the resonant springs and unnecessary radial dislocation of the mover 710 are reduced, and the movement of the mover is more accurate.

As shown in fig. 3, a positioning pin 630 may be used to pass through the holes of the fixed plate 500, the resonator plate 400, and the mover 710 to restrain the resonator plate 400 so that it can vibrate back and forth only in the axial direction of the positioning pin 630, thereby preventing deflection.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A linear compressor comprises a shell, a cylinder, a piston and a linear motor, wherein the linear motor comprises a stator and a rotor,

the linear compressor further comprises at least one first resonant spring, at least one second resonant spring and at least one third resonant spring extending in a direction parallel to the axis of the linear motor; wherein

Two ends of the first resonant spring are respectively connected with a first axial end of the stator and a first mounting part of the rotor;

two ends of the second resonance spring are respectively connected with the second mounting part of the rotor and a resonance plate;

two ends of the third resonance spring are respectively connected with the resonance plate and a fixing plate;

the second mounting portion is closer to the first axial end than the first mounting portion and the resonance plate are, in the linear motor axis direction, closer to the first axial end than the fixed plate is;

the resonance plate may move with the second resonance spring and the third resonance spring, and the fixing plate may be directly or indirectly fixed to the cabinet.

2. Linear compressor according to claim 1,

a connection point of the resonator plate to the second resonant spring is closer to the first axial end than a connection point of the resonator plate to the third resonant spring.

3. Linear compressor according to claim 1,

the at least one second resonant spring is closer to a central axis of the linear motor than the at least one first resonant spring in a radial direction of the linear motor; and is

Each of the third resonant springs is disposed coaxially with one of the second resonant springs.

4. Linear compressor according to claim 3,

the number of the at least one second resonance spring and the number of the at least one third resonance spring are multiple, the multiple second resonance springs and the multiple third resonance springs are respectively and uniformly distributed on respective distribution circles, and the circle centers of the distribution circles are all located on the central axis of the linear motor.

5. Linear compressor according to claim 1,

a connection point of the resonator plate to the third resonant spring is closer to the first axial end than a connection point thereof to the second resonant spring.

6. Linear compressor according to claim 5,

the at least one second resonant spring is closer to a central axis of the linear motor than the at least one first resonant spring in a radial direction of the linear motor; and is

Each of the third resonant springs is disposed coaxially with one of the first resonant springs.

7. Linear compressor according to claim 6,

the number of the at least one first resonant spring, the number of the at least one second resonant spring and the number of the at least one third resonant spring are all multiple and are uniformly distributed on respective distribution circles, and the circle centers of the distribution circles are all located on the central axis of the linear motor.

8. Linear compressor according to claim 5,

in a radial direction of the linear motor, the at least one second resonant spring and the at least one third resonant spring are not arranged coaxially and are each closer to a central axis of the linear motor than the at least one first resonant spring.

9. Linear compressor according to claim 1,

the linear compressor is of a vertical structure, and the axis of the linear motor extends in the vertical direction.

10. Linear compressor according to claim 9,

the cylinder is positioned below the stator;

the first axial end is the stator upper end;

the stator comprises an inner stator and an outer stator which are cylindrical and coaxially arranged, the outer stator is positioned on the radial outer side of the inner stator, and an annular gap is formed between the outer stator and the inner stator; and is

The active cell includes ring magnet and active cell skeleton, ring magnet is located in the annular gap, the active cell skeleton including connect in ring magnet's outer section of thick bamboo portion, stretch into the interior stator is inside in order to connect in the interior section of thick bamboo portion of piston, still be formed with on the active cell skeleton first installation department with the second installation department.

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