CN100476204C

CN100476204C - Linear compressor and corresponding drive unit for the linear compressor

Info

Publication number: CN100476204C
Application number: CNB2005800444694A
Authority: CN
Inventors: A·沙德; J·舒伯特
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2004-12-23
Filing date: 2005-11-30
Publication date: 2009-04-08
Anticipated expiration: 2025-11-30
Also published as: EP1831558B1; ES2366195T3; CN101087953A; ATE513993T1; US20080008607A1; RU2386052C2; DE102004062301A1; EP1831558A1; RU2007121334A; WO2006069885A1

Abstract

A drive unit for a linear compressor comprises a frame (21, 29, 30) and an oscillating body (24, 10). Said oscillating body is mounted in the frame (21, 29, 30) via at least one diaphragm spring (8) and can be moved back and forth in one direction. The diaphragm spring (8) comprises a plurality of limbs (14), fastened with one end to the frame (21, 29, 30) and with the other end to the oscillating body (24), which are associated with respective readjusting springs (31) that counteract a deformation of the arm (14).

Description

Linear compressor and be used for the drive unit of this linear compressor

Technical field

The present invention relates to a kind of linear compressor and especially a kind of drive unit that is used to drive the oscillatory type straight line piston motion that is used for this linear compressor in particular for the refrigeration agent in the compression refrigeration utensil.

Background technique

Disclose a kind of linear compressor by US 6506032B2, its drive unit comprises that a frame and one are bearing in oscillating body in this frame by a diaphragm spring.This oscillating body comprises a permanent magnet, a piston rod and a piston that is hinged on this piston rod that is connected rigidly with this permanent magnet, and this piston can to-and-fro motion in a cylinder.This piston move through solenoid actuated, this electromagnet and this a permanent magnet alternating action that is provided with around this cylinder circlewise.The diaphragm spring of a dish type is screwed on the middle part of this piston rod with screw, and the outward edge of this diaphragm spring is connected with a yoke, and this yoke surrounds this cylinder, electromagnet and permanent magnet.

This oscillating body and diaphragm spring constitute a vibratile system, and the natural frequency of this system is determined by the quality of oscillating body and diaphragm spring and the rigidity of this diaphragm spring.This diaphragm spring only allows little amplitude, because each deflection of oscillating body is all relevant with the expansion of this diaphragm spring.Because little amplitude is difficult to do the dead point volume of cylinder little reliably.But this dead point volume is big more, and then the efficient of compressor is just poor more.In addition, little stroke causes this cylinder to constitute to compare big diameter with length forcibly, so that realize given flow.Sufficiently sizable circumference of packed-piston takes a lot of trouble.

Because this oscillating body only is held by itself and being connected of spring diametrically, thus there is such possibility, that is, and the head reciprocally swinging that has piston of piston rod and on casing wall, wearing and tearing.In order to prevent this point, piston is provided with a pressurized gas supporting, promptly have some openings by the inswept casing wall of piston, these openings are connected with the high-pressure exhaust of this linear compressor so that between the inwall of this cylinder and piston air cushion of formation.But the supporting of this pressurized gas only just can be worked when having required overvoltage on the relief opening at this linear compressor, promptly is not in this compressor start or works when starting.This time engrave the danger that exists piston on casing wall, to wear and tear, thereby this compressor is ground away prematurely.

A kind of claim 2 linear compressor as described in the preamble is disclosed by US 6641377B2.In this double-piston linear compressor, each piston is kept by the diaphragm spring of two both arms respectively.

Because the bending of arm can realize bigger piston stroke.These arms piston vertically on transversely easily deformable than at this piston, so the contacting of their opposing pistons and casing wall.

In order to realize the desirable flow of compressor, the vibration frequency of this piston does not allow too little.The rigidity of this diaphragm spring is big more, and then this vibration frequency is just high more.But there is such danger in the diaphragm spring that rigidity is arranged very much, and promptly it takes place tired under the situation of high amplitude.

Summary of the invention

Task of the present invention is, a kind of drive unit linear compressor, that wearing and tearing are few that is used for is proposed, have a frame and one and be bearing in oscillating body in the frame by a diaphragm spring, wherein said diaphragm spring is not having to allow the big stroke of oscillating body under the tired dangerous situation, so can realize high flow under the little situation of piston diameter.

In order to realize high stroke under the situation that does not have fatigue of materials danger, the arm of described at least one diaphragm spring should be made by a kind of extremely thin material.Its intensity can be determined so limpingly, makes it only enough avoid the lateral deviation of oscillating body.Yet this weak diaphragm spring will cause the low natural frequency of drive unit and cause small flow by this drive unit compressor driven thus under the situation of predetermined stroke.Therefore, according to the present invention, for realize this drive unit for the enough natural frequencys of required flow, to Returnning spring of each arm configuration, the latter resists the distortion of this arm, described thus diaphragm spring constitutes a flexible system respectively with Returnning spring, and the rigidity of this system is obviously greater than the rigidity of the system that is made of diaphragm spring oneself.

Under the simplest situation, each arm has a section unique, bending on a direction.When deflection, this arm also is applied to a torque on the oscillating body by its carrying, thereby has also encouraged the rotational vibrations relevant with described to-and-fro motion of this oscillating body.For fear of the interference effect of this rotational vibrations, needing some parts at least of compressor is rotational symmetric structure.

But it is right that the arm of going up bending respectively in the opposite direction also can be set.Under the situation of this structure, the torque that occurs on differently crooked arm is compensated one another, so this oscillating body or does not hardly carry out the rotational vibrations relevant with this to-and-fro motion fully.

Preferred each arm has two sections crooked on different direction.Because also cause the torque of going up round about, thereby can make the torque of each single arm very little or make its disappearance at this differently crooked section.

Favourable also have, and at least one secondary diaphragm spring is set, and its arm acts on the zone of oscillating body, this zone on the direction of oscillating movement with the zone of action partition distance of primary diaphragm spring.By these two diaphragm springs, oscillating body reliably, be directed on the direction of desirable oscillating movement linearly, and can avoid the bias motion of side direction, this bias motion may cause contacting between piston that is carried by oscillating body and the cylinder that surrounds this piston.

The arm of same diaphragm spring preferably acts on the end of frame and/or connects integratedly respectively on it acts on the end of oscillating body at it.These ends that act on the frame can be connected by the frame with the leaf spring one.

Effective spring constant of the combination of diaphragm spring and Returnning spring can be conditioned, so that can coordinate the natural frequency of this drive unit as required.

The preferred helical spring that uses is as Returnning spring.

A linear compressor also is a theme of the present invention, it have a working room, one can be in this working room to-and-fro motion with the piston of compression working fluid and a above-mentioned type, connect to drive described reciprocating drive unit with this piston.

Description of drawings

Other features and advantages of the present invention are from obtaining the explanation to embodiment with reference to the accompanying drawings.Shown in the figure:

Fig. 1: the sectional view that the part of a linear compressor is dissected,

Fig. 2: according to of the present invention, be used for using plan view at the diaphragm spring of the compressor of Fig. 1,

Fig. 3: the plan view of second configuration of a diaphragm spring.

Embodiment

Fig. 1 illustrates the sectional view that the part of a linear compressor is dissected.This compressor has the frame of a band central chamber 21, be configured with some openings wherein at two opposed arms in---for the sake of clarity be called with reference to diagram at this cover 22 and the end 23---, the oscillating mass 24 of a clavate has and passes these openings extensions with gap.This chamber 21 be set for receive unshowned, be used for driving a reciprocating electromagnet that is inserted into the permanent magnet of this oscillating mass 24.

The end of oscillating mass 24 is fixed on the center region 16 of two diaphragm springs 8 by means of screw or rivet 25.

In Fig. 2, a diaphragm spring 8 is shown with plan view.This diaphragm spring 8 has the rectangle outer shroud or the frame 13 of a sealing, and before this diaphragm spring was installed in the compressor, described outer shroud or frame were stablized this diaphragm spring and protected it with preventing distortion.Begin from the bight of this frame 13 to extend four towards the center region 16 arm 14, these arms are made of section 17 and two

curved section

18,19 that connect these linear section 17 of three straight lines respectively.Two

sections

18,19 of each arm 14 have the opposite curvature direction respectively.Four holes 20 that are used for fixing this diaphragm spring 8 are positioned on the bight of this frame 13.

Frame 13 contact of each diaphragm spring 8 is in the contact pin 26 of stretching out from the described lid 22 of central chamber 21 and the end 23.These diaphragm springs 8 are fixed in the described contact pin 26 by screw or rivet 27 respectively, these screws or rivet respectively with the bight of foot's section 28 top and the

yoke

29,30 of bottom and described frame 13 in one of these holes 20 intersect and be coupled in the described central chamber 21.The height of contact pin 26 has been determined the range of the motion of oscillating mass 24; If this range is exceeded, then center region 16 collisions of diaphragm spring 8 at described lid 22 or at the end 23.

If these center region 16 deflections, then it causes described

curved section

18,19 slightly upward curved.Because the opposite curvature direction of two

curved section

18,19 of each arm is by the described curved opposite respectively torque that draws, therefore very little by the torque that each single arm 14 is applied on the center region 16.In addition, the torque of each alternate arm 14 compensates one another, and equates on the contrary because each in them is another mirror image and the torque direction that therefore applied by them.This center region 16 and therefore piston rod 10 fixed thereon accurately reach linearly thus not have and be directed to with reversing.

The yoke 30 of bottom has two helical springs 31, these helical springs are placed respectively like this, make their head sections freely 32 and---as illustrating as imaginary point line profile among Fig. 2---contact the curved section 18 of two arms 14 respectively, if they deflect down, and therefore resist deflecting down of oscillating mass 24.Corresponding helical spring 31 is set, the curved section 18 of arm and the upward deflecting of opposing oscillating mass of the diaphragm spring 8 on these helical spring contact tops on the yoke 29 on top.

The yoke 29 on top also has 33, one in a cylinder can to-and-fro motion in this cylinder by a piston rod 10 and these oscillating mass 24 pistons that be connected, invisible in the drawings.Because this oscillating mass 24 accurately is directed to linearly by two diaphragm springs 8, thus this piston rod 12 and by the piston of this piston rod carrying along with this piston rod does not depart from transverse to moving direction, and can avoid the wearing and tearing of piston on the inwall of this cylinder 33.By the motion of this piston, fluid is taken over 34 via a suction of this cylinder 33 and is inhaled into, is compressed and be discharged from via a pressure tap 35 again.

When oscillating mass 24 was positioned on the stop of its track, then its whole kinergety was stored in these diaphragm springs 8 and the helical spring 31 with the form of energy of deformation, and wherein their spring constants are separately depended in the distribution of this energy on types of springs.Therefore, these diaphragm springs can be done extremely thinly and be easily deformable, even thereby under long playing situation fatigue of materials can not appear yet, because those energy that can not store because these diaphragm springs lack enough rigidity can be determined correspondingly that the helical spring 31 of size absorbs.

In addition, can realize having the compressor of different flow with the diaphragm spring of same model, its mode is, these diaphragm springs respectively with the helical spring combination with different spring constants, they provide the different natural frequency of this vibratile system respectively.

Can consider that also the natural frequency of a drive unit can be coordinated, its mode is that these helical springs 31 are assembled on the described

yoke

29,30 movably.The zone that the head sections 32 by helical spring 31 of arm 14 contacts is positioned on the center region 16 of diaphragm spring 8 the closer to ground, then the rigidity of the whole system of being made up of diaphragm spring and helical spring is just high more, and the natural frequency of the drive unit that draws thus is just high more.

Possiblely under extreme case be, two helical springs 31 of each

yoke

29,30 are replaced by a unique helical spring respectively, and the latter is in direct contact with on the described center region 16.

Fig. 3 illustrates a modification of the diaphragm spring 8 among Fig. 3, and these diaphragm springs are in the compressor that can use on their position at Fig. 4.In the diaphragm spring of Fig. 5, removed housing 13; The substitute is, only be that arms 14 two the right and two left sides connect by a material rod on their end that deviates from center region 16.Therefore at this, these arms are wideer and than the spring among Fig. 2 rigidity is arranged more under the identical situation of the outside dimensions of diaphragm spring.That diaphragm spring among its functional mode and Fig. 3 is as broad as long.

Claims

1. the drive unit that is used for a linear compressor, has a frame (21,29,30) and one be bearing in this frame (21 by at least one diaphragm spring (8), 29,30), can be on a linear direction reciprocating oscillating body (24,10), wherein said diaphragm spring (8) has a plurality of arms (14), these arms act on frame (21,29,30) with an end and go up and act on this oscillating body (24) with another end, it is characterized in that: each arm (14) has been disposed a Returnning spring (31), and described Returnning spring has the opposite effect with the distortion of described arm (14) on described linear direction.

2. according to the drive unit of claim 1, it is characterized in that: these arms (14) have the extension of a bending between described two ends.

3. according to the drive unit of claim 2, it is characterized in that: each arm (14) has two sections (18,19) crooked on different direction.

4. according to one drive unit among the claim 1-3, it is characterized in that: this drive unit comprises at least one secondary diaphragm spring (8); First and second diaphragm spring (8) act on oscillating body (24,10) on the zone of partition distance on the direction of oscillating movement.

5. according to one drive unit among the claim 1-3, it is characterized in that: the arm (14) of same diaphragm spring (8) connects integratedly acting on the end (16) on the oscillating body (24,10) of they.

6. according to one drive unit among the claim 1-3, it is characterized in that: the arm (14) of same diaphragm spring (8) connects integratedly acting on the end on the frame (21,29,30) of they.

7. according to the drive unit of claim 6, it is characterized in that: these ends that act on the frame (21,29,30) are connected by the frame (13) with described arm (14) one.

8. according to one drive unit among the claim 1-3, it is characterized in that: the rigidity of diaphragm spring (8) on deformation direction is less than the rigidity of Returnning spring (31).

9. according to one drive unit among the claim 1-3, it is characterized in that: diaphragm spring (8) can be conditioned with effective spring constant of the combination of Returnning spring (31).

10. according to one drive unit among the claim 1-3, it is characterized in that: described Returnning spring (31) is a helical spring.

11. according to one drive unit among the claim 1-3, it is characterized in that: the quality of oscillating body (24,10) is greater than the quality of all springs (8,31).

12. a linear compressor, have a working room, one can be in this working room to-and-fro motion one of require according to aforesaid right with the piston of compression working fluid and one, be connected on this piston to drive this reciprocating drive unit.