CN210949023U - Linear compressor - Google Patents

Abstract

The utility model provides a linear compressor, which comprises a shell; a linear motor including a stator and a mover; a cylinder defining a space for compressing a refrigerant; the piston is driven by the rotor to do linear reciprocating motion along the axis direction of the linear motor so as to compress a refrigerant in the cylinder; and at least one spring mass damping module including an elastic member coupled to the mover and a mass coupled to the elastic member, for damping axial vibration of the linear compressor. The utility model discloses a linear compressor can effectively reduce axial vibration, and simple structure is reliable.

Description

Linear compressor

technical field

The utility model relates to the technical field of compressors, in particular to a linear compressor.

Background technique

A damping spring is usually provided between the bottom of the pump body and the bottom wall of the inner casing in the piston compressor to absorb the vibration of the compressor.

A linear compressor is a piston compressor using a linear motor. The linear motor includes a stator and a mover, and the mover performs linear reciprocating motion along the axial direction, which makes the axial vibration of the linear compressor relatively large. Moreover, since the axial direction of the mover is generally parallel to the horizontal direction, the vertically extending damping spring has little effect on absorbing the axial vibration of the compressor.

Utility model content

The purpose of this utility model is to provide a linear compressor capable of effectively reducing axial vibration.

A further object of the present invention is to reduce the axial vibration of the linear compressor by using a simple and highly reliable structure, and improve the reliability.

In particular, the present invention provides a linear compressor, which includes:

chassis;

Linear motor, set in the casing, including stator and mover;

a cylinder, which is arranged in the casing and defines a space for compressing the refrigerant;

The piston, driven by the mover, performs linear reciprocating motion along the axis of the linear motor to compress the refrigerant in the cylinder; and

At least one spring-mass vibration damping module includes an elastic part connected to the mover and a mass block connected to the elastic part, and is used for damping the axial vibration of the linear compressor.

Optionally, both ends of the elastic member in the length direction are respectively connected to the mover and the mass block, and the connecting lines of the two ends are not parallel to the axis direction of the linear motor.

Optionally, the connecting line between the two ends of the length direction of the elastic member is perpendicular to the axis direction of the linear motor.

Optionally, the elastic member is a plate-like structure made of elastic material.

Optionally, the elastic member is installed on the mover in a threaded connection; and the mass block is installed on the elastic member in a threaded connection.

Optionally, the axis direction of the linear motor is parallel to the horizontal direction; the stator includes an inner stator and an outer stator that are both cylindrical and coaxially arranged, the outer stator is located radially outside the inner stator, and there is an annular gap between the two; the cylinder Located on the axial side of the stator; the mover includes an annular magnet and a mover skeleton, the annular magnet is located in the annular gap, and the mover skeleton includes an annular end plate portion located on the other axial side of the stator and perpendicular to the axial direction of the annular magnet and respectively. An inner cylindrical portion and an outer cylindrical portion extending from the inner and outer peripheral edges of the annular end plate portion, the inner cylindrical portion extending from the inside of the inner stator to be connected to the piston, and the outer cylindrical portion connected to the annular magnet.

Optionally, the number of spring mass damping modules is one, and the elastic member is connected to the top of the inner peripheral edge of the annular end plate portion.

Optionally, the number of spring mass damping modules is one, and the elastic member is connected to the top of the outer peripheral edge of the annular end plate portion.

Optionally, the number of spring mass damping modules is two, and the elastic members of the two are respectively connected to the top and bottom of the outer peripheral edge of the annular end plate portion.

Optionally, the linear compressor further includes: a mounting plate fixed in the casing, the annular end plate portion is located between the mounting plate and the inner stator; and a plurality of first resonance springs and a plurality of second resonance springs, all along the line The two ends of each first resonance spring are respectively fixed to the mounting plate and the annular end plate, and the two ends of each second resonance spring are respectively fixed to the annular end plate and the end face of the inner stator.

The linear compressor of the utility model is provided with a spring mass vibration damping module on the mover. During the reciprocating motion of the mover, the elastic member reciprocates with the mover, and the mass block will vibrate reciprocatingly around the connection point between the elastic member and the mover due to inertia and elastic deformation of the elastic member. Thereby, the spring mass vibration damping module changes the natural vibration characteristics of the compressor vibration system, increases the damping, absorbs the vibration energy, and effectively reduces the axial vibration of the linear compressor.

Further, in the linear compressor of the present invention, the structure of the spring mass damping module is simple and compact, the installation position is flexible and the assembly is convenient, which is suitable for being arranged inside the linear compressor with a compact structure, and does not interfere with the original structure of the linear compressor. Structural design. Moreover, the manufacturing cost is low and the use reliability is high.

Further, the present invention optimizes the quantity and installation position of the spring mass damping modules, so as to achieve the best damping effect.

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

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

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

Fig. 2 is the exploded schematic diagram of the spring mass damping module in Fig. 1;

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

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

Detailed ways

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. Linear compressors can be used in vapor compression refrigeration cycles, such as refrigerators or freezers, for compressing refrigerants.

The linear compressor of the embodiment of the present invention may generally include a casing 100 , a linear motor 700 , a cylinder 200 , a piston 300 and at least one spring mass damping module 500 .

The casing 100 defines an accommodating cavity, and is installed with a suction pipe (not shown) and an exhaust pipe (not shown). The linear motor 700 is installed in the casing 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 and operates, an electromagnetic force is generated between the stator 720 and the mover 710 , and the mover 710 performs linear reciprocating motion relative to the stator 720 under the action of the electromagnetic force.

The cylinder 200 is disposed in the casing 100 , which defines a space for compressing the refrigerant, that is, a compression chamber 201 . Driven by the mover 710 , the piston 300 performs linear reciprocating motion along the axis direction of the linear motor 700 (ie, the x-axis direction marked in the figure) to compress the refrigerant in the cylinder 200 . An exhaust valve 210 is also installed at the end of the cylinder 200. When the piston 300 moves toward the exhaust valve 210, the refrigerant in the cylinder 200 is compressed, that is, a compression process is performed. When the pressure of the refrigerant gas is large enough, the exhaust valve 210 is pushed open to exhaust to the outside, and the exhaust process is performed. Then, the piston 300 changes the direction of movement and moves away from the exhaust valve 210, and the cylinder 200 sucks the low-pressure refrigerant to perform the suction process. The intake, compression and exhaust processes of the cylinder 200 are performed cyclically.

The mover 710 is also provided with one or more spring mass damping modules 500 . The spring mass damping module 500 includes an elastic member 510 and a mass 520 . The elastic member 510 is connected to the mover 710 , and can produce elastic deformation after being stressed, and returns to its original state under the action of the elastic deformation force after the external force disappears. For example, the elastic member 510 may be a plate-like structure made of an elastic material, such as a thin metal plate. The mass block 520 is connected to a part of the elastic member 510, so that the elastic member 510 concentrates a larger mass in this part. During the reciprocating motion of the mover 710, the elastic member 510 reciprocates with the mover 710, and the mass block 520 will vibrate back and forth centered on the connection point between the elastic member 510 and the mover 710 due to the inertia and the elastic deformation of the elastic member 510, The moving direction and speed of the mass 520 are not synchronized with the mover 710 . This enables the spring mass vibration damping module 500 to change the natural vibration characteristics of the overall vibration system of the linear compressor, increase the damping, absorb the vibration energy, and effectively reduce the axial vibration of the linear compressor.

FIG. 2 is an exploded schematic view of the spring mass damping module 500 in FIG. 1 . As shown in FIG. 1 and FIG. 2 , the elastic member 510 can be made into a long strip, so that the two ends in the longitudinal direction are connected to the mover 710 and the mass block 520 respectively, so that the center of gravity of the mass block 520 is separated from the elastic member 510 and the mover. The 710 connection points are farther apart, so that the mass 520 has a larger amplitude and a stronger ability to damp vibrations.

The line connecting the two ends in the length direction of the elastic member 510 can be made non-parallel to the axis direction of the linear motor 700 , so as to facilitate the deformation of the elastic member 510 and the swing of the mass 520 . Preferably, the line connecting the two ends of the length direction of the elastic member 510 is perpendicular to the axis direction of the linear motor 700. For example, in FIG. The line connecting the two ends in the length direction (ie, the upper and lower ends) is along the vertical direction. Compared with other angles, setting the vertical angle can optimize the deformation ability of the elastic member 510 and the swing ability of the mass 520 .

As shown in FIG. 2 , the elastic member 510 can be mounted on the mover 710 in a threaded manner, and the mass 520 can also be mounted on the elastic element 510 in a threaded manner. Specifically, two ends of the elastic member 510 in the longitudinal direction are respectively provided with through holes 512 , the mass block 520 is provided with threaded holes 522 , and screws 530 are used to connect the mass block 520 to the elastic member 510 . This makes the installation of the spring mass damping module 500 very convenient.

The embodiment of the present invention is particularly suitable for reducing the axial vibration of the horizontal structure linear compressor. Figure 1 illustrates an alternative configuration of a horizontal-type linear compressor.

As shown in FIG. 1 , the axis direction of the linear motor 700 is parallel to the horizontal direction. The stator 720 includes an inner stator 722 and an outer stator 721 that are both cylindrical and coaxially arranged. The outer stator 721 is located radially outside the inner stator 722 with an annular gap 701 therebetween. A coil 723 is provided on the inner stator 722 . The cylinder 200 is located on one side of the stator 720 in the axial direction. The mover 710 includes a ring magnet 711 and a mover frame 712 . The annular magnet 711 is located in the annular gap 701 for generating electromagnetic force with the stator 720 . After the linear motor 700 is powered on, the ring magnet 711 will reciprocate under the action of electromagnetic force. The mover frame 712 includes an annular end plate portion 7122 , an inner cylindrical portion 7126 and an outer cylindrical portion 7124 . The annular end plate portion 7122 is located on the other side in the axial direction of the stator 720 , that is, the annular end plate portion 7122 and the cylinder 200 are arranged on both sides in the axial direction of the stator 720 . The plane of the annular end plate portion 7122 is perpendicular to the axial direction (x-axis) of the annular magnet 711 . The inner cylindrical portion 7126 and the outer cylindrical portion 7124 respectively extend from the inner and outer peripheral edges of the annular end plate portion 7122, and the inner cylindrical portion 7126 extends from the central through hole 702 inside the inner stator 722 to the piston 300, and is connected to the piston 300, for driving the piston 300 . The outer cylindrical portion 7124 is connected to the ring magnet 711 . The annular end plate portion 7122 , the inner cylinder portion 7126 and the outer cylinder portion 7124 can be integrally formed or assembled.

As shown in FIG. 1 , a skeleton 900 may also be provided. The frame 900 is fixed in the casing 100 for fixing the stator 720 and the cylinder 200 . The stator 720 and the cylinder 200 are fixed to the frame 900 directly or indirectly. For example, the cylinder 200 can be indirectly fixed to the frame 900 through a flange 220 . The flange 220 is fixed in the frame 900, which has an inner hole. One axial end of the flange 220 abuts against one axial end of the stator 720 , and the other axial end abuts against the inner side of the end plate 920 of the frame 900 . The cylinder 200 is fixed in the inner hole of the flange 220 . The middle of the end plate 920 has an exhaust cavity 932 for accommodating the exhaust valve 210 , and an end cover 930 is provided outside the end plate 920 to close the exhaust cavity 932 . The linear compressor may have a low back pressure structure, the cylinder 200 sucks low-pressure refrigerant from the inside of the casing 100 , and the exhaust gas flow in the compression chamber 201 communicates with the exhaust pipe of the casing 100 to discharge high-pressure gas. In some alternative embodiments, the linear compressor may also have a medium back pressure or a high back pressure structure, and the specific setting methods are well known to those skilled in the art, and will not be repeated here.

3 is a schematic cross-sectional view of a linear compressor according to another embodiment of the present invention; FIG. 4 is a schematic cross-sectional view of a linear compressor according to another embodiment of the present invention.

1 , 3 and 4 illustrate several preferred installation locations for the spring mass damping module 500 . In the embodiment of the present invention, the number and installation positions of the spring-mass vibration-damping modules 500 are optimally designed, so that the axial vibration-damping effect is optimal.

In some embodiments, as shown in FIG. 1 , the number of the spring mass damping modules 500 is one. And, the elastic member 510 is connected to the top of the inner peripheral edge of the annular end plate portion 7122 . Specifically, the elastic member 510 is a long plate-like structure, the upper end of which is connected to the annular end plate portion 7122 and the lower end is connected to the mass block 520 . The lower end of the elastic member 510 is opposite to the cavity of the inner cylinder portion 7126 to facilitate the vibration of the elastic member 510 .

In some embodiments, as shown in FIG. 2 , the number of spring-mass damping modules 500 is one. And, the elastic member 510 is connected to the top of the outer peripheral edge of the annular end plate portion 7122 . Specifically, the elastic member 510 is a long plate-like structure, the lower end of which is connected to the annular end plate portion 7122 and the upper end is connected to the mass block 520 , so that the position of the mass block 520 is higher than the outer cylinder portion 7124 .

In some embodiments, as shown in FIG. 3 , the number of the spring mass damping modules 500 is two. And, the elastic members 510 of the two spring-mass damping modules 500 are respectively connected to the top and bottom of the outer peripheral edge of the annular end plate portion 7122 . Specifically, the elastic members 510 of the two spring-mass damping modules 500 are both elongated plate-like structures. The lower end of the elastic member 510 of the spring mass damping module 500 on the upper side is connected to the annular end plate portion 7122, and the upper end is connected to the mass block 520, so that the position of the mass block 520 is higher than the outer cylinder portion 7124, so as to facilitate its vibration. The upper end of the elastic member 510 of the spring mass damping module 500 located on the lower side is connected to the annular end plate portion 7122, and the lower end is connected to the mass block 520, so that the position of the mass block 520 is lower than the outer cylinder portion 7124 to facilitate its vibration.

In addition to the above three optimal setting solutions, other reasonable designs for the quantity and installation position of the spring-mass vibration damping modules 500 can also be made, so as to make them exert the effect of reducing axial vibration.

In the linear compressor of the embodiment of the present invention, the spring mass vibration damping module 500 has a simple and compact structure, flexible installation position, convenient assembly, high reliability, and is suitable for being arranged inside a compressor with a compact structure, and does not interfere with the operation of the compressor. Original structural design. Also, the cost is very low.

In some embodiments, as shown in FIG. 1 , the linear compressor further includes a resonant system. Specifically, it includes a mounting plate 400 , a plurality of first resonance springs 810 and a plurality of second resonance springs 820 .

The mounting plate 400 is fixed in the casing 100 , and the annular end plate portion 7122 is located between the mounting plate 400 and the inner stator 722 . The plurality of first resonance springs 810 and the plurality of second resonance springs 820 both extend along the axis direction of the linear motor 700 . Both ends of each first resonance spring 810 are respectively fixed to the mounting plate 400 and the annular end plate portion 7122 , and both ends of each second resonance spring 820 are respectively fixed to the annular end plate portion 7122 and the end surface of the inner stator 722 .

When the linear compressor is running, the resonant spring, the mover 720 and the piston 300 form a vibration system. When the operating frequency of the linear compressor reaches or is close to the resonance frequency of the vibration system, the linear compressor can achieve higher energy efficiency and compress The vibration and noise of the machine will be lower. The resonance system is widely used in linear compressors, and its principle will not be introduced too much here.

Preferably, the number of the first resonant springs 810 and the second resonant springs 820 is the same, for example, ten. And, each of the first resonance springs 810 and one of the second resonance springs 820 are arranged coaxially. In addition, the plurality of first resonant springs 810 and the plurality of second resonant springs 820 can also be uniformly distributed on a circumference coaxial with the linear motor 700 (that is, taking the x-axis as the central axis). In this way, each resonant spring supports the mover 710 in a more uniform and dispersed manner, reduces unnecessary deformation of the resonant spring and unnecessary up-and-down displacement of the mover 710, and makes its movement more precise.

The embodiment shown in FIG. 1 only provides two sets of resonant springs, and in some alternative embodiments, three or more sets of resonant springs may also be provided.

By now, those skilled in the art will recognize that although various exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, Numerous other variations or modifications consistent with the principles of the present invention are directly identified or derived from the disclosure of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A linear compressor, characterized by comprising:

a housing;

the linear motor is arranged in the shell and comprises a stator and a rotor;

a cylinder disposed in the casing, defining a space for compressing a refrigerant;

the piston is driven by the rotor to do linear reciprocating motion along the axis direction of the linear motor so as to compress a refrigerant in the cylinder; and

at least one spring mass damping module including an elastic member connected to the mover and a mass connected to the elastic member, for damping axial vibration of the linear compressor.

2. Linear compressor according to claim 1,

the two ends of the elastic part in the length direction are respectively connected with the rotor and the mass block, and the connecting line of the two ends is not parallel to the axis direction of the linear motor.

3. Linear compressor according to claim 2,

the connecting line of the two ends of the elastic part in the length direction is vertical to the axis direction of the linear motor.

4. Linear compressor according to claim 1,

the elastic member is a plate-shaped structure made of an elastic material.

5. Linear compressor according to claim 1,

the elastic part is mounted on the rotor in a threaded connection manner; and is

The mass is mounted to the elastic member in a threaded connection.

6. Linear compressor according to claim 1,

the axial direction of the linear motor is parallel to the horizontal direction;

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;

the cylinder is positioned on one axial side of the stator;

the active cell includes annular magnet and active cell skeleton, annular magnet is located in the annular gap, the active cell skeleton is including being located stator axial opposite side and perpendicular to annular end plate portion of annular magnet axial with follow respectively the interior section of thick bamboo portion and the outer barrel portion that extend of the inside, outer periphery edge of annular end plate portion, interior section of thick bamboo portion is followed interior stator is inside to extend in order to connect in the piston, outer barrel portion connect in annular magnet.

7. Linear compressor according to claim 6,

the number of the spring mass vibration reduction modules is one, and the elastic piece is connected to the top of the inner periphery of the annular end plate part.

8. Linear compressor according to claim 6,

the number of the spring mass vibration reduction modules is one, and the elastic piece is connected to the top of the outer periphery of the annular end plate portion.

9. Linear compressor according to claim 6,

the spring mass vibration reduction modules are two in number, and the elastic pieces of the two are respectively connected to the top and the bottom of the outer periphery of the annular end plate part.

10. The linear compressor of claim 6, further comprising:

a mounting plate fixed in the housing, the annular end plate portion being located between the mounting plate and the inner stator; and

a plurality of first resonance springs and a plurality of second resonance springs all follow linear electric motor's axis direction extends, every first resonance spring both ends are fixed in respectively the mounting panel with annular end plate portion, every second resonance spring both ends are fixed in respectively annular end plate portion with the terminal surface of inner stator.

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