CN111836962A

CN111836962A - Hermetic compressor and stator insulator

Info

Publication number: CN111836962A
Application number: CN201980007298.XA
Authority: CN
Inventors: 张贤浩; 凯伟·凯文·张
Original assignee: Panasonic Appliances Refrigeration Devices Singapore Pte Ltd
Current assignee: Panasonic Appliances Refrigeration Devices Singapore Pte Ltd
Priority date: 2018-01-05
Filing date: 2019-01-04
Publication date: 2020-10-27
Anticipated expiration: 2039-01-04
Also published as: WO2019135712A1; SG10201800146TA; CN111836962B

Abstract

A hermetic compressor and a stator insulator for the compressor are disclosed. The hermetic compressor includes an electromotive part which drives a compression part. The motor portion and the compression portion are housed within a container. The electromotive part has a stator supporting the compression part. The stator includes a stator core and a lower insulator. The stator is supported above the base of the container by a plurality of suspension springs. The lower insulator is provided with at least one bumper that engages with one of the plurality of suspension springs.

Description

Hermetic compressor and stator insulator

Technical Field

The present disclosure relates to a hermetic compressor, and more particularly, to an arrangement of a damper for a suspension spring in a hermetic compressor.

Background

Reducing the vibrations and simplifying the assembly of hermetic compressors has always been a concern for the manufacturers of household appliances, in particular in compressors for refrigeration appliances.

Many appliances employ reciprocating compressors. The hermetic compressor includes a motor having a crankshaft connected to a connecting rod. The connecting rod is connected to a piston housed in the cylinder head. The connecting rod, the piston and the cylinder head together form a pump assembly of the hermetic compressor. The pump assembly and the motor form a compressor assembly. During operation, the crankshaft of the motor rotates at a predetermined speed. The rotational motion is converted to linear reciprocating motion by a connecting rod connected to a piston. Noise is generated by the rotational motion of the motor and also by the vibration of the reciprocating connecting rods and pistons of the pump assembly.

Damping of vibrations from a hermetic compressor is currently accomplished by mounting the entire compressor assembly on a suspension spring inside the hermetic compressor. The suspension springs are further enhanced by bumpers that help maintain the integrity and shape of the suspension springs, and also prevent the suspension springs from being displaced from their intended positions.

A damper is generally used in pairs for each suspension spring. An upper bumper is attached to the compressor assembly and a corresponding lower bumper is attached to a lower portion of the hermetic shell. The upper snubber is substantially aligned with the lower snubber and allows the upper snubber to fit into one end of a suspension spring while the lower snubber fits into the opposite end of the same suspension spring.

In some hermetic compressors, the upper bumper is a protrusion formed on a front support leg and a rear support leg connected to the stator. Due to the need to reduce compressor parts and simplify the assembly process, in recent developments, the bolt head screwed on the periphery of the stator also serves as an upper buffer connected to the suspension spring. However, the position of the upper bumper is limited by the position of the bolt head.

Disclosure of Invention

In aspects of the present disclosure, one or more bumpers are provided on a stator insulator within a hermetic compressor. This provides flexibility in the positioning of the damper and, therefore, the suspension spring. Further, since the buffer is provided on the stator insulator, the number of parts of the hermetic compressor can be reduced.

According to a first aspect of the present application, a hermetic compressor includes an electromotive element and a compression element. In operation, the electric element drives the compression element. The electromotive element includes a stator core and a lower insulator. The compression element is disposed above the electrically powered element in the reservoir housing, and the stator supports the compression element. A plurality of suspension springs support the stator above the base of the container. The lower insulator of the stator includes at least one bumper configured to engage one of the plurality of suspension springs.

In an embodiment of the invention, the lower insulator of the stator comprises at least one bumper configured to engage with a suspension spring supporting the stator and thus a compression element located above the stator. The suspension spring serves to damp vibrations generated by the reciprocating motion of the compression element. By providing one or more bumpers on the insulator, the range of possible positions of the bumpers is increased without requiring additional components of the hermetic compressor, since the bumpers can be integrated into the lower insulator of the stator.

In some embodiments, one or more bumpers on the insulator are disposed within the perimeter defined by the stator core. The bumper may overlap a coil winding on a bobbin formed at least in part from an insulator. In some embodiments, the bumper may be disposed on a deformable arm that allows the coil winding to be wound around the bobbin before the bumper is positioned by bending the deformable arm. The damper may be configured to mechanically engage the spool using a clamping or locking mechanism to hold the damper in place.

In some embodiments, one or more bumpers on the insulator are disposed outside a perimeter defined by the stator core. This positioning allows the damper to be placed relatively far from the central axis of the stator.

The bumper may include a protrusion configured to engage the suspension spring by fitting into one end of the suspension spring. Alternatively, the damper may include a cup portion configured to receive one end of the suspension spring.

According to a second aspect of the present disclosure, a stator insulator portion configured to receive a stator core includes at least one bumper configured to engage with a suspension spring.

The stator insulator portion may be substantially annular in cross-section, and the bumper may be disposed on a deformable arm extending in a radial direction from the insulator portion.

The stator insulator portion may include at least one bobbin portion configured to form at least a portion of a bobbin for receiving a coil winding. The deformable arm may allow the bumper to move to a position overlapping the bobbin. The bumper may be configured to engage the bobbin in a position overlapping the bobbin.

Drawings

Embodiments of the invention will be described hereinafter as non-limiting examples with reference to the accompanying drawings, in which:

fig. 1 shows a sectional view of a hermetic compressor;

fig. 2 is a view showing a compression element and an electromotive element of the hermetic compressor;

fig. 3A illustrates a side view of a compressing element and an electromotive element of a hermetic compressor according to an embodiment of the present invention;

FIG. 3B illustrates a bottom view of the compression element and the electrically powered element shown in FIG. 2A;

fig. 4A illustrates a perspective view of a compression element and an electromotive element of a hermetic compressor according to an embodiment of the present invention;

FIG. 4B illustrates a side view of the compression element and the electrically powered element shown in FIG. 4A;

FIG. 5 illustrates a cross-section of a snubber formed of a lower stator insulator in accordance with one embodiment of the present invention;

FIG. 6A illustrates a snubber formed of a lower stator insulator in accordance with one embodiment of the present invention; and

FIG. 6B illustrates a cross-sectional view of the bumper shown in FIG. 6A.

Detailed Description

Fig. 1 shows a sectional view of a hermetic compressor. Hermetic compressor 100 comprises a hermetic container formed by a top hermetic container portion 101 and a bottom hermetic container portion 102. Hermetic compressor 100 includes a compression element 103 driven by an electromotive element 104. Compression element 103 includes cylinder block 105, piston 106, crankshaft 107, and connecting rod 108. The electromotive element 104 includes a stator 109, and the stator 109 includes a stator core 110 and a plurality of stator coil windings 111. The rotor 112 is located within the stator 109. As shown in fig. 1, compression element 103 is disposed above electrically powered element 104. Electrically powered element 104 supports compression element 103. The electromotive element 104 is supported above the base of the bottom airtight container portion 102 by a plurality of suspension springs 113.

In use, current is supplied to the coil windings 111 of the stator 109. This causes a varying magnetic field to be generated by the stator coil windings 111 and the stator core 109. The magnetic field causes the rotor 112 to rotate within the stator 109. Rotation of rotor 112 causes crankshaft 107 to rotate. Rotation of crankshaft 107 reciprocates piston 106 within a cylinder in cylinder block 105. This reciprocating motion compresses the refrigerant as part of the refrigeration cycle.

The reciprocating motion of the piston 106 in the cylinder causes vibration and noise. These vibrations are damped by the suspension spring 113 and the bumpers at the top and bottom of the suspension spring.

Fig. 2 is a view showing a compression element and an electromotive element of a hermetic compressor. In the example shown in fig. 2, compression element 203 includes cylinder block 205. The electric element 204 includes a stator formed from a stator core 210 formed from a ferromagnetic material. Stator insulator 214 is disposed within stator core 210. The stator insulator 214 forms a bobbin around which the stator coil winding 211 is wound. The rotor 212 is located within the stator.

As shown in fig. 2, the compression element 203 is connected to the electromotive element 204 by four bolts 215. Bolts 215 attach cylinder block 205 to stator core 210. The bolt 215 forms a bumper on which the suspension spring 213 is mounted. This arrangement is advantageous in that the number of components of the hermetic compressor is reduced since the bolt 215 also performs the function of the upper bumper to which the suspension spring 213 is mounted. A disadvantage of this arrangement is that the position of the bolt 215 and thus the position of the damper is determined by the position of the stator core 210 and the position of the compression element 203 in contact with the electric element 204.

Fig. 3A is a side view of a compressing element and an electromotive element of a hermetic compressor according to an embodiment of the present invention. Fig. 3B is a bottom view of the compression element and the electrically powered element shown in fig. 3A.

In the embodiment shown in fig. 3A and 3B, the stator 310 includes an upper stator insulator 311 and a lower stator insulator 312. A stator core (not shown in fig. 3A and 3B) is disposed between the upper stator insulator 311 and the lower stator insulator 312. The lower stator insulator 312 includes a plurality of buffers 313, and in this embodiment, the buffers 313 include protrusions 314, and the protrusions 314 are fitted inside the suspension spring to support the compression element and the electromotive element and damp vibration.

As shown in fig. 3B, the lower stator insulator 312 is substantially annular in cross-section. The lower stator insulator 312 defines a circular interior cavity in which the rotor 316 is located. The plurality of bobbins 315 are defined by a lower stator insulator 315. The plurality of bobbins 315 have a central axis in a radial direction. A stator coil (not shown in fig. 3B) is wound around the bobbin. In the embodiment shown in fig. 3A and 3B, the bumper 313 extends outside the periphery of the annular shape of the lower stator insulator 312. In this embodiment, the buffer 313 is arranged at a position symmetrical with respect to the central axis of the rotor 316.

Fig. 4A illustrates a perspective view of a compression element and an electromotive element of a hermetic compressor according to an embodiment of the present invention. Fig. 4B is a side view of the compression element and the electrically powered element shown in fig. 4A.

In the embodiment shown in fig. 4A, 4B, the compression element 403 has a center of gravity that is asymmetric with respect to the central axis of the stator 410 of the electromotive element 404. As shown in fig. 4A, the main body of the cylinder block 405 is located on the left side of the hermetic compressor. Therefore, the center of gravity of the compression element 403 is also located to the left of the center axis of the electromotive element 404. This arrangement reduces the amount of material required for the compression elements, particularly cylinder block 405. However, a translation of the center of gravity of the compression element 403 away from the central axis of the stator 410 must be compensated in the position of the suspension spring.

In this embodiment, two different types of bumpers are provided to engage the suspension springs. The first type of damper 415 is formed by the head of a bolt that attaches the cylinder block 405 to the stator core 413. The second type of damper 420 is formed by the lower stator insulator 412. Fig. 4A shows a second type of damper 420, the damper 420 being in a position extending radially from the lower stator insulator 420. As shown in fig. 4A, a second type of bumper 420 is attached to the body of the lower stator insulator 412 by a deformable arm 412. The tab 422 extends from the second type of bumper 422.

As shown in fig. 4A, the stator 410 is formed of an upper stator insulator 411, a stator core 413, and a lower stator insulator 412. The upper stator insulator 411 and the lower stator insulator 412 form a bobbin 416, and a stator coil winding 417 is wound on the bobbin 416.

Fig. 4B is a side view of the compression element and the electromotive element shown in fig. 4A, in which the deformable arms 421 have been bent such that the second type of bumper 420 is located below the stator core 413. As shown in fig. 4B, the deformable arm 421 includes a cut-away portion 423 having a reduced thickness to allow the deformable arm 421 to be bent such that the bumper 420 mounted on the end of the deformable arm 421 faces downward. A tab 422 attached to the second type of bumper 420 engages a retaining clip 425 located on one of the plurality of bobbins 416. This engagement holds the second type of bumper 420 in place.

The described arrangement of the second type of snubber 420 allows the second type of snubber 420 to overlap the coil winding 417. This means that the suspension spring mounted on the second type damper 420 may be closer to the center axis of the stator core 413 than the first type damper 415 (formed by the bolt head of the bolt that attaches the cylinder block 405 to the stator core 413). In the arrangement shown in fig. 4A, this allows the position of the suspension spring 414 to be changed to compensate for the offset of the center of gravity of the compression element 403.

Providing the second type of bumper 420 on the deformable arm 421 allows the coil winding 417 to be wound around the bobbin 416 before moving the second type of bumper 420 into position by bending the deformable arm 421. This facilitates the manufacture of the hermetic compressor with a minimum number of parts.

FIG. 5 illustrates a cross-section of a snubber formed of a lower stator insulator according to one embodiment of the present invention. As shown in fig. 5, the lower stator insulator 512 is located below the stator core 513. The lower stator insulator 512 forms a lower portion of the bobbin 516, and the coil winding 517 is wound around the bobbin 516. Deformable arms 521 extend radially outward from lower stator insulator 512. Deformable arm 521 is bent back on itself into a C-shape. The curvature of the deformable arm 521 is highest at the cut-away portion 523 where the thickness of the deformable arm 521 is reduced. Bumper 520 attached to deformable arm 521 includes a downward facing projection. The opposite face of the bumper 520 rests on the bobbin 516. The tab 522 extends from the bumper 520 and the hook 526 engages the slot 525 in the bobbin 516. The locking mechanism holds the bumper 520 in place.

As described above, one or more bumpers may be formed from the lower stator insulator. This provides more design freedom for the position of the damper and, therefore, the position of the suspension spring. For example, as shown in fig. 3A, 3b, the bumpers may be disposed outside the periphery of the stator core. This allows the suspension springs to be placed at a greater distance from the central axis of the stator core and the rotor. As described above with respect to fig. 4A, 4B, and 5, the bumper may be arranged to overlap with the coil windings of the stator. This arrangement allows the suspension springs to be positioned closer to the center axis of the stator core and the rotor.

In the above embodiments, the bumper is formed as the protruding portion. Embodiments are also contemplated in which some or all of the bumpers are formed with a cupped profile configured to receive one end of a suspension spring.

FIG. 6A illustrates a snubber formed of a lower stator insulator in accordance with an embodiment of the present invention. As shown in fig. 6A, the bumper 620 is formed of a lower stator insulator 612. In this embodiment, the bumper 620 has a cup-shaped profile, and the suspension spring 614 fits within the bumper 620. As shown in fig. 6A, a lower bumper 630 is fitted inside the suspension spring 614 at the bottom of the suspension spring 614. The lower buffer 630 is located on the bottom of the lower hermetic container portion of the hermetic compressor. The arrangement shown in fig. 6A is advantageous in that, since the upper bumper formed of the lower stator insulator 612 is fitted over the suspension spring 614 and the lower bumper 630 is fitted within the suspension spring 614, the length of the suspension spring can be reduced without the risk that the bumpers would collide with each other.

FIG. 6B illustrates a cross-sectional view of the bumper shown in FIG. 6A. As shown in fig. 6B, the bumper 620 formed by the lower stator insulator 612 has a hollow cup-shaped interior. The top surface may include a circular groove to receive the suspension spring 614.

The stator insulator in the above embodiments may be formed of a material such as PBT (polybutylene terephthalate) or LCP (liquid crystal polymer). However, it should be understood that the insulator material is not limited to these materials.

While the foregoing description has described exemplary embodiments, those skilled in the art will appreciate that many variations of the embodiments are possible within the scope and spirit of the invention.

Claims

1. A hermetic compressor comprising an electromotive element and a compression element accommodated in a container, the electromotive element being configured to drive the compression element and comprising a stator including a stator core and a lower insulator, wherein the compression element is disposed inside the container above the electromotive element such that the stator supports the compression element, the hermetic compressor further comprising a plurality of suspension springs configured to support the stator above a base of the container, wherein the lower insulator comprises at least one bumper configured to engage one of the plurality of suspension springs.

2. The hermetic compressor of claim 1, wherein the stator core defines a peripheral edge of the stator, and the at least one bumper is disposed within the peripheral edge of the stator.

3. The hermetic compressor of claim 2, wherein the stator includes a plurality of coil windings, each of the coil windings being wound around a respective bobbin, each bobbin being at least partially formed by the lower insulator, wherein the at least one bumper is disposed below one of the plurality of coil windings.

4. The hermetic compressor of claim 3, wherein the at least one bumper is connected to the lower insulator by a deformable arm.

5. The hermetic compressor of claim 4, wherein the at least one bumper is configured to mechanically engage one of the bobbins.

6. The hermetic compressor of claim 1, wherein the stator core defines a peripheral edge of the stator, and the at least one bumper is disposed outside the peripheral edge of the stator.

7. The hermetic compressor of any one of the preceding claims, wherein the at least one bumper includes a protrusion configured to engage one of the plurality of suspension springs.

8. The hermetic compressor of any one of claims 1 to 6, wherein the at least one bumper includes a cupped portion configured to receive one end of one of the plurality of suspension springs.

9. A stator insulator portion configured to receive a stator core, the stator insulator portion including at least one bumper configured to engage a suspension spring and thereby support the stator core.

10. The stator insulator portion of claim 9, the stator insulator portion being substantially annular in cross-section and having deformable arms extending in a radial direction, the deformable arms connecting the at least one bumper to the stator insulator portion.

11. The stator insulator portion of claim 10 further comprising at least one bobbin portion configured to form at least a portion of a bobbin for receiving a coil winding, the deformable arm configured to enable the at least one bumper to move to a position overlapping the bobbin.

12. The stator insulator portion of claim 11, said at least one bumper being arranged to engage said bobbin at a location overlapping said bobbin.