CN210949022U

CN210949022U - Linear compressor

Info

Publication number: CN210949022U
Application number: CN201921643910.6U
Authority: CN
Inventors: 罗荣邦; 宋斌; 王飞; 刘洋
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-07-07
Anticipated expiration: 2029-09-29

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 each first resonant spring are respectively connected with the axial end surface of the stator and the spring mounting part of the rotor; two ends of each second resonance spring are respectively connected with the spring mounting part and a resonance plate; two ends of each third resonance spring are respectively connected with the resonance plate and a fixing plate; the resonance plate is positioned between the fixed plate and the spring mounting part and can move along with the second resonance spring and the third resonance spring, and the fixed plate is directly or indirectly fixed on the machine shell; and assuming that the mass of the piston is m1, the mass of the mover is m2, and the mass of the resonance plate is m3, the following relationships are satisfied: m1+ m2 < m3 < 1.5(m1+ m 2). The utility model discloses a linear compressor can have higher operating frequency.

Description

Linear compressor

Technical Field

The utility model relates to a compressor technical field, in particular to 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.

Linear compressors typically include two sets of resonant springs to form a single free vibration system with a mover and a piston. Specifically, the length direction of the resonant spring is parallel to the axial direction of the linear motor. Two ends of one group of resonance springs are respectively positioned between the rotor framework and the axial end face of the stator, the other group of resonance springs are positioned between the rotor framework and a fixing plate fixed with the casing, the rotor framework is positioned between the fixing plate and the axial end face of the stator, and the resonance springs and the refrigerant gas spring form an approximate resonance system. When the linear compressor is operated, the operation frequency of the linear compressor needs to be consistent with the natural frequency of the vibration system, so that the linear compressor can obtain higher energy efficiency.

However, the natural frequency of the vibration system is related to the diameter, wire diameter, material, number of turns of the resonant spring, the mass of the movable part of the compressor. The larger the cooling capacity, the larger the required mover mass, which results in a smaller natural frequency. Therefore, it is difficult to increase the cooling capacity of the linear compressor by increasing the operation frequency, resulting in difficulty in applying the linear compressor to a refrigerating apparatus having a large cooling capacity.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a promote the linear compressor of refrigerating capacity through improving operating frequency.

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; two ends of each first resonant spring are respectively connected with the axial end surface of the stator and the spring mounting part of the rotor; two ends of each second resonance spring are respectively connected with the spring mounting part and a resonance plate; two ends of each third resonance spring are respectively connected with the resonance plate and a fixing plate; the resonance plate is positioned between the fixed plate and the spring mounting part and can move along with the second resonance spring and the third resonance spring, and the fixed plate is directly or indirectly fixed on the machine shell; and assuming that the mass of the piston is m1, the mass of the mover is m2, and the mass of the resonance plate is m3, the following relationships are satisfied: m1+ m2 is more than m3 and less than or equal to 1.5(m1+ m 2).

Alternatively, m1, m2, and m3 satisfy the following relationships: 1.1(m1+ m2) is not less than m3 is not more than 1.3(m1+ m 2).

Optionally, the resonator plate is made of steel.

Alternatively, the elastic coefficients of all the first resonant spring, the second resonant spring and the third resonant spring are the same.

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 multiple and the same, and the at least one first resonant spring, the at least one second resonant spring, and the at least one third resonant spring are circumferentially and uniformly distributed with the axis of the linear motor as a center.

Alternatively, each of the third resonant springs is disposed coaxially with one of the second resonant springs and one of the first resonant springs.

Optionally, the linear compressor further comprises: and each positioning pin is inserted into the hole of the fixing plate, the inside of the third resonant spring, the hole of the resonant plate, the inside of the second resonant spring, the hole of the spring mounting part and the inside of the first resonant spring in sequence and is finally directly or indirectly fixed on the axial end surface of the stator.

Optionally, the resonator plate comprises: an annular plate; and the mounting lug plates extend from different angle positions of the periphery of the annular plate respectively, and two side surfaces of each mounting lug plate extend out of a cylindrical part respectively so as to be fixedly inserted with the second resonant spring and the third resonant spring respectively.

Optionally, the axis of the linear motor extends in a vertical direction.

Optionally, the cylinder is located below the stator, and the bottom end of the first resonant spring is fixed to 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; and 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 with the annular magnet and an inner cylinder part extending into the inner stator to be connected with the piston, and a spring mounting part is further formed on the rotor framework.

The utility model discloses a linear compressor has set up three rows of resonance spring. The three rows of resonant springs are taken as a whole, two ends of each resonant spring are fixed (one end of the first resonant spring is fixed on the stator, the third resonant spring is fixed on the fixed plate and equivalently fixed on the casing), and the middle of each resonant spring is connected with the (spring mounting part of the) rotor and the resonant plate, so that a two-degree-of-freedom vibration system is formed. The natural frequency of the two-degree-of-freedom vibration system is greatly improved compared with that of a single-degree-of-freedom vibration system. When the excitation frequency is the same as or close to the second natural frequency, the phases of the resonance plate and the mover are opposite, so that the force acting on the fixed plate (which is equivalent to acting on the casing) can be offset, the force applied to the casing can be reduced, and the vibration can be remarkably reduced. The relationship that the mass m1 of the piston, the mass m2 of the rotor and the mass m3 of the resonance plate is set to be m1+ m2 < m3 and less than or equal to 1.5(m1+ m2), so that the vibration damping effect is better.

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 structural view of a resonance plate of a linear compressor according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of the resonator plate shown in fig. 2.

Detailed Description

Fig. 1 is a schematic 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 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 (i.e., 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 710 and the piston 300 form a vibration system, and when the operation frequency of the linear compressor reaches or approaches to the natural frequency of the vibration system, the linear compressor can obtain higher energy efficiency, and the vibration and noise of the compressor can be lower.

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 spring mounting portion 7121 for mounting the resonant spring. Both ends of each first resonant spring 810 are respectively connected to the axial end surface of the stator 720 and the spring mounting portion 7121 of the mover 710. Both ends of each second resonant spring 820 are connected to the spring mounting portion 7121 and a resonant plate 400, respectively. Both ends of each of the third resonant springs 830 are connected to the resonator plate 400 and a fixing plate 500, respectively. The resonator plate 400 is located between the fixed plate 500 and the spring mounting part 7121 and is movable with the second and third

resonant springs

820 and 830, that is, the resonator plate 400 is connected only with the second and third

resonant 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 compressor of the embodiment of the present invention, three rows of resonant springs are fixed at both ends thereof as a whole (one end of the first resonant spring 810 is fixed to the stator 720; one end of the third resonant spring 830 is fixed to the fixing plate 500, which is equivalent to the case 100), and the middle of the three rows of resonant springs is connected with (the spring mounting portion 7121 of) the mover 710 and the resonant plate 400, which constitute a two-degree-of-freedom vibration system.

The natural frequency of the single degree of freedom vibration system is calculated by the following formula:

where k is the spring constant of the spring and m is the total mass of the system.

The calculation formula of the natural frequency of the two-degree-of-freedom vibration system is as follows:

where k1 and k2 are the spring constants of the two springs, respectively.

As can be seen from the above, the natural frequency of the two-degree-of-freedom vibration system of the present embodiment is greatly improved compared to the single-degree-of-freedom vibration system. Furthermore, when the excitation frequency is the same as or close to the second natural frequency, the phases of the resonator plate 400 and the mover 710 are opposite, so that the force applied to the fixed plate 500 (indirectly applied to the casing 100) can be offset, the force applied to the casing 100 can be greatly reduced, and the vibration can be significantly reduced.

Assuming that the mass of the piston 300 is m1, the mass of the mover 710 is m2, and the mass of the resonator plate 400 is m3, the following relationships are satisfied according to practical experience: m1+ m2 is more than m3 and is less than or equal to 1.5(m1+ m2), so that the damping effect can be better.

Further, it is preferable to optimize the vibration damping effect by setting 1.1(m1+ m2) ≦ m3 ≦ 1.3(m1+ m2), and particularly, by setting m3 to 1.2(m1+ m 2).

It is preferable to make the resonator plate 400 of a material having a relatively high density, such as steel, in order to reduce the volume thereof and save the cost.

The elastic coefficients of all the first resonant spring 810, the second resonant spring 820 and the third resonant spring 830 may be the same, or further, the specifications and dimensions thereof may be the same, so as to facilitate the manufacturing, facilitate the assembly and avoid confusion.

The number of the at least one first resonant spring 810, the at least one second resonant spring 820 and the at least one third resonant spring 830 may be the same as each other. And, the three are circumferentially and uniformly distributed around the axis x-axis of the linear motor 700. Each of the third resonant springs 830 may be further coaxially disposed with one of the second resonant springs 820 and one of the first resonant springs 810. Thus, the resonant springs support the mover 710 more uniformly and dispersedly, and unnecessary deformation of the resonant springs and unnecessary radial displacement of the mover 710 are reduced, so that the movement of the mover is more accurate.

As shown in fig. 1, the linear compressor may further include a plurality of locating pins 610. Each of the positioning pins 610 is inserted into the hole 501 of the fixing plate, the inside of the third resonant spring 830, the hole 401 of the resonator plate 400, the inside of the second resonant spring 820, the hole 7129 of the spring mounting portion 7121, and the inside of the first resonant spring 810 in this order, and finally fixed directly or indirectly to the axial end surface of the stator 720, for example, screwed into the threaded hole of the positioning seat 7215 of the end surface of the stator 720. The locating pin 610 may constrain the resonator plate 400 to oscillate back and forth only in the axial direction of the locating pin 610 to avoid skewing.

As shown in fig. 2 and 3, the resonator plate 400 may be made to include an annular plate 410 and a plurality of mounting ears 420. The annular plate 410 is annular. A plurality of mounting lug plates 420 extend from different angles of the periphery of the annular plate 410, and a cylindrical portion 422 extends from each side surface of each mounting lug plate 420 to be fixed with the second resonant spring 820 and the third resonant spring 830 in an inserting manner. This structure of the resonator plate 400 is very simple and has less obstruction to the air flow.

As shown in fig. 1, the linear compressor may be of a vertical structure, i.e., the axis x-axis of the linear motor 700 extends in a vertical direction. Of course, the linear compressor may also be a horizontal structure (x-axis extending horizontally), and will not be described in detail.

As shown in fig. 1, in a vertical compressor as an example, the stator 720 includes an inner stator 722 and an outer stator 721, 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 positioned below the stator 720, and the bottom end of the first resonant spring 810 is mounted to the upper end of the stator 720. Specifically, a positioning seat 7215 is installed on the top surface of the stator 720, and the first resonant spring 810 is sleeved on the positioning seat 7215.

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 mover frame 712 is further formed with the spring mounting portion 7121 described above. The inner cylinder portion 7126, the outer cylinder portion 7124, and the spring mounting portion 7121 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.

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

1. The utility model provides a linear compressor, includes casing, cylinder, piston and linear electric motor, linear electric motor includes stator and active cell, its characterized in that still includes:

at least one first resonant spring, at least one second resonant spring and at least one third resonant spring, the extending directions of which are parallel to the axis of the linear motor; wherein

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

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

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

the resonance plate is positioned between the fixed plate and the spring mounting part and can move along with the second resonance spring and the third resonance spring, and the fixed plate is directly or indirectly fixed on the machine shell; and is

Assuming that the mass of the piston is m1, the mass of the mover is m2, and the mass of the resonance plate is m3, the following relationships are satisfied:

m1+m2＜m3≤1.5(m1+m2)。

2. the linear compressor of claim 1, wherein m1, m2, and m3 satisfy the following relationship:

1.1(m1+m2)≤m3≤1.3(m1+m2)。

3. linear compressor according to claim 1,

the resonance plate is made of steel.

4. Linear compressor according to claim 1,

all the first resonant spring, the second resonant spring and the third resonant spring have the same elastic coefficient.

5. Linear compressor according to claim 1,

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 the same, and the at least one first resonant spring, the at least one second resonant spring and the at least one third resonant spring are circumferentially and uniformly distributed by taking the axis of the linear motor as a center respectively.

6. Linear compressor according to claim 5,

each of the third resonant springs is disposed coaxially with one of the second resonant springs and one of the first resonant springs.

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

a plurality of locating pins, every the locating pin inserts in proper order the hole of fixed plate inside the third resonance spring the hole of resonance plate inside the second resonance spring the hole of spring mounting portion inside the first resonance spring, directly or indirectly be fixed in at last the axial terminal surface of stator.

8. The linear compressor of claim 5, wherein the resonance plate includes:

an annular plate; and

and the mounting lug plates extend from different angles of the periphery of the annular plate respectively, and two side surfaces of each mounting lug plate extend out of a cylindrical part respectively so as to be fixedly inserted with the second resonance spring and the third resonance spring respectively.

9. Linear compressor according to claim 1,

the axis of the linear motor extends in a vertical direction.

10. Linear compressor according to claim 9,

the cylinder is positioned below the stator, and the bottom end of the first resonant spring is fixed at 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 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 annular magnet and active cell skeleton, annular magnet is located in the annular gap, the active cell skeleton including connect in annular 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 the spring mounting portion.