EP2212556A1 - Linearverdichter und antriebsaggregat dafür - Google Patents
Linearverdichter und antriebsaggregat dafürInfo
- Publication number
- EP2212556A1 EP2212556A1 EP08852620A EP08852620A EP2212556A1 EP 2212556 A1 EP2212556 A1 EP 2212556A1 EP 08852620 A EP08852620 A EP 08852620A EP 08852620 A EP08852620 A EP 08852620A EP 2212556 A1 EP2212556 A1 EP 2212556A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive unit
- unit according
- diaphragm spring
- spring
- oscillating body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
- F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
Definitions
- the present invention relates to a linear compressor, in particular for use for compressing refrigerant in a refrigerator, and a drive unit for driving an oscillating piston movement for such a linear compressor.
- DE 10 2004 062 301 A1 discloses a drive unit for a linear compressor with a frame, a vibrating body that is movable in the frame via at least one diaphragm spring and at least one auxiliary spring acting parallel to the movement.
- the diaphragm spring of this known drive unit comprises four arms which are integrally connected to one another on the oscillating body and extend in each case zigzag outwards from the oscillating body to attachment points on the frame. Since the arms of the diaphragm spring are easier to deform in the direction of movement of the oscillating body than transversely thereto, they ensure a precise guidance of the oscillating body, without requiring additional guide parts.
- the pairwise opposite spring arms force the oscillating body to a straight-line oscillating movement, in which the distance of a fastening point of the oscillating body to the spring at the reversal points of the oscillating motion is greater than in the equilibrium position. Since the material of the diaphragm spring is not stretched to any significant extent, the diaphragm spring can only yield to the forces acting at the reversal points between the attachment points by the middle portion of each spring arm is compressed in its longitudinal direction. The occurring deformation of the diaphragm spring is unevenly distributed, in particular stress peaks occur at the break points at which the arms change direction.
- the diaphragm spring 50 When the linear compressor is in operation, the diaphragm spring 50 experiences load changes per second, corresponding to the frequency of the AC voltage with which the compressor is operated.
- the material of the leaf spring In order to achieve a life of the linear compressor of many years, corresponding to the life expectancy of the rotary-driven compressors introduced on the market, the material of the leaf spring has to withstand many millions of load changes without significant damage or fatigue. This goal is difficult to achieve with the currently known forms of diaphragm springs.
- Object of the present invention is therefore to provide a drive unit for a linear compressor, which works reliably for a long time with high probability.
- a drive unit for a linear compressor with a frame, a vibrating body and a diaphragm spring at a first attachment point on the frame and at a second attachment point on
- Oscillating body is mounted to guide the oscillating body to the frame to and fro, the diaphragm spring in a region between the two attachment points, preferably a central region, a smaller cross-sectional area than at the attachment points. The occurring in the leaf spring in the deflected state
- Attachment point is the largest, and minimal in the middle, where opposite
- the attachment points are conveniently located at two opposite ends of the elongated diaphragm spring.
- the diaphragm spring preferably has a constant thickness and in the middle region a smaller width than at the fastening points.
- the membrane can be made in a simple manner from flat material of constant thickness, in particular punched out of spring plate.
- the diaphragm spring should be free of openings.
- the cross section of the diaphragm spring expediently varies continuously in the longitudinal direction of the diaphragm spring. It is particularly advantageous if the change in cross section beyond that in the longitudinal direction is continuously differentiable.
- the diaphragm spring should be free of openings. Namely, if an opening tapers toward one of the attachment points, the forces acting in the spring tend to concentrate at the tip, so that in the course of operation material damage preferably occurs in the vicinity of such a tip. If, on the other hand, a wall of the opening facing the attachment point is rounded off, the change in the cross-sectional area of the diaphragm spring is inevitably discontinuous, and a uniform distribution of the deformation stress via the spring can not be achieved.
- the above requirements are easy to fulfill because the diaphragm spring has at least one concave edge.
- the curvature of the deflected diaphragm spring should change its sign across its middle section. In the middle section then necessarily exists an undeformed site.
- a shape of the deformable region of the diaphragm spring has proven to be particularly resistant, comprising in longitudinal section two mutually inversion-symmetrical arcs, in particular parabolic arcs.
- a curve function that describes the edge course of such a diaphragm spring can not be specified in analytical form, but a specialist can make a prototype of such a diaphragm spring without inventive effort by starting from a diaphragm spring of any shape whose longitudinal section detected in the deflected state and Places whose curvature is smaller than desired, abrading material.
- an arc shape can be realized whose curvature increases linearly from a clamped edge region up to a local maximum, from there it decreases linearly to a local minimum while the sign changes, and from there rises again to zero. It is also advantageous to provide at least a second diaphragm spring, the arms of which act on a region of the oscillating body which is spaced from the engagement region of the first diaphragm spring in the direction of the oscillating movement. By two diaphragm springs of the vibrating body is reliably guided to the linear device of the desired oscillating motion, and a lateral rolling movement of the vibrating body can be avoided.
- the material of the diaphragm spring should be as thin as possible and thus easily flexible.
- a slightly flexible diaphragm spring has a low resonance frequency.
- the resonant frequency is in turn proportional to the capacity of a linear compressor in which the drive unit is used. Therefore, a high resonance frequency is desired from the viewpoint of the capacity.
- at least one parallel to the movement of the oscillating body acting auxiliary spring is provided.
- the stiffness of the diaphragm spring parallel to the movement is preferably smaller than that of the auxiliary spring.
- the time sequence and in particular the period of the oscillatory movement is essentially determined by the auxiliary spring, while the diaphragm spring essentially determines the path of the oscillating body during the oscillating movement.
- the auxiliary spring may conveniently be a coil spring.
- the center of gravity of the oscillating body (5) is then preferably movable along the longitudinal axis of the helical spring.
- the drive unit comprises two auxiliary springs, which are connected to each other at two first ends and to the oscillating body and extend in opposite directions in the direction of movement.
- a linear compressor which uses the drive unit according to the invention.
- Such a linear compressor preferably has a compressor chamber coupled to the oscillating body by a piston rod. Since the suspension of the oscillating body on the leaf spring guides the oscillating body on a slightly curved path, but the compressor chamber requires an exactly linear drive movement, a transverse component of the movement of the oscillating body can be compensated by means of the piston rod.
- the piston rod is surrounded by the at least one auxiliary spring.
- auxiliary springs In order to introduce the force of the auxiliary springs in the oscillating body, preferably carries the piston rod a flange, press against the two auxiliary springs from opposite directions.
- Fig. 1 is a perspective view of a linear compressor
- Fig. 2 is a plan view of a diaphragm spring of the linear compressor of Fig. 1;
- the linear compressor shown in Fig. 1 has a frame 1 with a base plate on which two E-shaped soft iron cores 2 are mounted mirror-symmetrically opposite each other. Of the three mutually facing legs 3 of the soft iron cores 2 each of the middle is hidden by a magnetic coil 4, by the winding it extends.
- the Membrane springs 6, 7 made of spring steel in each case substantially the shape of a rectangle waisted by recesses along its longitudinal sides.
- a plurality of mounting holes 8 are formed, which serve for anchoring the diaphragm spring 6, 7 on an end face of the oscillating body 5 or on an edge of a projecting from the base plate side wall 9 of the frame 1 by means of screws, rivets or the like , which pass through the mounting holes 8 and openings of clamping plates 14.
- the clamping plates 14 are shown in Fig. 1 transparent to leave the mounting holes 8 visible.
- the edge portions of the diaphragm spring 6 are, by being clamped between the clamping plates 14 and the end face of the oscillating body 5 and the edge of the side wall 9, protected from any deformation.
- the deformable surface of the diaphragm spring 6 lying between the attachment points is free of openings of any kind.
- a piston rod 11 which connects the vibrating body 5 with a reciprocating in a pumping chamber 12, not shown piston extends.
- the holes 8 are each on two mutually parallel, dash-dotted line in Fig. 2 lines.
- a control circuit applied to the magnetic coils 4 with an alternating current of controlled frequency and amplitude, to generate between each of the middle and the two outer legs 3 magnetic fields with alternating orientation.
- the vibrating body 5 includes a permanent magnet which is subjected to an oscillating force by the magnetic field thus generated and drives a swinging motion of the vibrating body 5.
- the two diaphragm springs 6, 7 guide the vibrating body 5 on a slightly curved path, wherein movement of the vibrating body 5 transversely to the direction of movement of the piston in the pumping chamber 12 is absorbed by a corresponding oscillating movement of the piston rod 11 and is not transmitted to the piston.
- the path on which the oscillating body 5 moves is exactly defined by the diaphragm springs 6, 7.
- the capacity of the compressor is proportional to the resonant frequency of the oscillating body 5.
- To stiffen the oscillatory system in the direction of movement of the piston are two coil springs 16, 17, each attacking on opposite sides of a protruding from the piston rod 1 1 flange 18 and of which the 16 at a movement of the diaphragm spring 6 limiting intermediate edge 19 of the Frame 1 and the other 17 is supported on the pumping chamber 12.
- the coil springs 16, 17 are exactly centered on the piston rod 11 by means of flat circular disks 20 and a ring 21, and by a truncated cone 22, of the flange 18 on its two sides, of the intermediate wall 19 and of the pumping chamber 12 from into the interior of the coil springs 16, 17 engage. By centering is excluded that the coil springs 16, 17 except a desired force in the direction of the piston rod 1 1 also exert a torque on the oscillating system of oscillating body 5, piston rod 11 and piston.
- Fig. 2 shows a plan view of one of the two identical spring plates 6.7. Between the clamped edge portions of the deformable main portion extends with continuous, inwardly curved longitudinal edges 15. The course of the longitudinal edges is chosen so that when the spring plate 6 and 7 is deflected, a longitudinal section results in the greatly over-marked in Fig. 3 course
- the main section has two oppositely curved halves 23, 24. The curvature is zero at each edge of each half 23, 24, ie at a center line 25, at which the halves 23, 24 adjoin one another, and where the halves pass into the clamped edge portions.
- the center line 25 is also the point at which the width of the diaphragm spring 26 is minimal.
- the curvature increases linearly toward the center of the respective half 23, 24, i.e., in the direction of the center.
- the points 26 of maximum curvature are in each case in a distance corresponding to one quarter of the length of the main section from its center 25 or its edges.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007055166A DE102007055166A1 (de) | 2007-11-19 | 2007-11-19 | Linearverdichter und Antriebsaggregat dafür |
| PCT/EP2008/064194 WO2009065684A1 (de) | 2007-11-19 | 2008-10-21 | Linearverdichter und antriebsaggregat dafür |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2212556A1 true EP2212556A1 (de) | 2010-08-04 |
| EP2212556B1 EP2212556B1 (de) | 2012-02-29 |
Family
ID=40019409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08852620A Not-in-force EP2212556B1 (de) | 2007-11-19 | 2008-10-21 | Linearverdichter und antriebsaggregat dafür |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2212556B1 (de) |
| AT (1) | ATE547628T1 (de) |
| DE (1) | DE102007055166A1 (de) |
| ES (1) | ES2380647T3 (de) |
| WO (1) | WO2009065684A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009047743A1 (de) * | 2009-12-09 | 2011-06-16 | BSH Bosch und Siemens Hausgeräte GmbH | Verdichter mit einem Tragegestell |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6056519A (en) * | 1997-10-15 | 2000-05-02 | Matsushita Refrigeration Company | Structure of vibrating compressor |
| DE102004062307A1 (de) * | 2004-12-23 | 2006-07-13 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter |
| DE102004062301A1 (de) | 2004-12-23 | 2006-07-13 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter und Antriebsaggregat dafür |
| DE102006009232A1 (de) | 2006-02-28 | 2007-08-30 | BSH Bosch und Siemens Hausgeräte GmbH | Linearverdichter und Antriebsaggregat dafür |
-
2007
- 2007-11-19 DE DE102007055166A patent/DE102007055166A1/de not_active Withdrawn
-
2008
- 2008-10-21 WO PCT/EP2008/064194 patent/WO2009065684A1/de not_active Ceased
- 2008-10-21 ES ES08852620T patent/ES2380647T3/es active Active
- 2008-10-21 AT AT08852620T patent/ATE547628T1/de active
- 2008-10-21 EP EP08852620A patent/EP2212556B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009065684A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009065684A1 (de) | 2009-05-28 |
| DE102007055166A1 (de) | 2009-05-20 |
| EP2212556B1 (de) | 2012-02-29 |
| ATE547628T1 (de) | 2012-03-15 |
| ES2380647T3 (es) | 2012-05-17 |
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