US20070041856A1 - Linear compressor - Google Patents
Linear compressor Download PDFInfo
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- US20070041856A1 US20070041856A1 US11/501,396 US50139606A US2007041856A1 US 20070041856 A1 US20070041856 A1 US 20070041856A1 US 50139606 A US50139606 A US 50139606A US 2007041856 A1 US2007041856 A1 US 2007041856A1
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- United States
- Prior art keywords
- stop
- piston
- linear compressor
- compressor according
- plate spring
- 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.)
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Classifications
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- 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
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- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
- F04B49/14—Adjusting abutments located in the path of reciprocation
Definitions
- the invention concerns a linear compressor with a piston reciprocating in a cylinder, a linear motor acting upon the piston and a resonance spring arrangement connected with the piston.
- the linear motor of such a linear compressor has a stator and an armature moving in relation to the stator and being connected with the piston.
- the armature reciprocates, the piston reciprocates accordingly, thus increasing and reducing a compression chamber in the cylinder.
- a resonance spring arrangement is connected with the piston or with the armature, said arrangement being adapted to the operation frequency of the linear motor. The linear motor is then operated in the resonance frequency of the spring.
- a linear compressor as mentioned in the introduction is known from U.S. Pat. No. 6,783,335 B2.
- the resonance spring is located on the side of the armature facing away from the piston.
- An anti-collision device is connected with the resonance spring, said device having an elastic element and a damping element.
- An excessive movement of the piston will cause the middle section of the resonance spring to strike the damping element, the impact being further damped by the elastic element, which deforms elastically for the damping.
- this does not provide the opportunity of a final setting of a defined end position for the piston.
- the resonance spring consists of a stack of several plate spring plates, each spring plate having several mutually interlocked spring arms, which are formed by slots in the plates.
- U.S. Pat. No. 6,755,627 B2 shows a further linear compressor with an anti-collision device, which is located at the piston side end of the armature, between the stator and the armature.
- an anti-collision device which is located at the piston side end of the armature, between the stator and the armature.
- the armature strikes a spring arm and moves it until the spring arm strikes an elastic damping element.
- the elastic damping element is still deformable to a certain extent, however, with increased resistance. This does not either provide setting of a defined end position of the piston.
- U.S. Pat. No. 6,779,984 B2 proposes a different method.
- a sensor is provided, which indicates the reaching of the upper dead point of the piston.
- the sensor then controls the electrical supply to the linear motor so that a striking of the piston on the front wall of the cylinder is prevented.
- Such a control is relatively expensive.
- the invention is based on the task of reliably preventing a damaging of the compressor during operation.
- the stop thus provides a well-defined and fixed stop position for the piston in the upper dead point.
- the resonance spring arrangement bears on the stop and permits no further movement.
- a damping element which could be deformed when reaching the stop, is not available and not necessary either.
- the spring bears on the stop it has already been deformed. The heavier the deformation, the larger the deformation resistance. The impact of the resonance spring arrangement on the stop thus occurs in the area of a lower speed, the impact being, in fact, damped already.
- the cylinder and the stop are displaceable in relation to each other in the movement direction of the piston during the mounting of the linear compressor.
- This provides a simple manner of setting the dead space in the cylinder. An external force moves the piston so far that the resonance spring arrangement bears on the stop. The piston is thus in its “upper dead point”, that is, in a position, in which the compression chamber in the cylinder shall have its smallest extension. In this position, the cylinder is now displaced so far in relation to the piston that the dead space has the desired minimum volume. In this position the cylinder is then fixed, for example connected with a fixture, which again is connected with the stator of the linear motor.
- the resonance spring arrangement has at least one plate spring, which gradually comes to rest on the stop, when the piston moves in the direction of its upper dead point.
- the free spring length is reduced gradually with the movement of the piston towards its upper dead point, which causes that the rigidity of the resonance spring arrangement is accordingly increased.
- the plate spring can successively roll on the stop, stop noises are reduced and the life of the plate spring is increased.
- the shape, particularly the inclination, of the stop permits a very accurate setting of the characteristic of the resonance spring system.
- the same plate springs can also be used for different compressors. The spring properties can then be influenced via the stop.
- the stop is located in a stop housing, whose extension is adapted to the cross-section of the linear motor.
- the stop housing has the same outer diameter as the linear motor, deviations in both directions being possible to a certain extent, as long as the stop housing does not collide with an enclosure, in which the linear motor is adapted. Then, the space provided by the enclosure can be used to its full extent, so that the resonance spring arrangement can be relatively large.
- the plate spring has in the unloaded state a predetermined distance to the stop housing.
- the plate spring can initially move a distance before starting to rest on the stop.
- the stop has a convex contact surface.
- the total width of the spring arms of the plate spring will not come to rest on the stop surface, but only a partial area, as the stop is arched. This may prevent a possible sticking of the plate spring, which might, for example, be caused by a lubrication oil film. Further, excessive tensions in the material of the plate spring are prevented, if the impact of the plate springs on the stop housing does not occur exactly parallel to the stop surface, but with an edge. This also makes it possible to keep the noises small.
- the plate spring has at least one arched arm.
- a relatively long arm can be realised, that is, the length of the arm is not limited by the radius of the stop housing.
- the plate spring has several arched arms, which are located and mutually interlocked in the form of several spirals. This provides a simple manner of preventing a tilting moment on the armature or on the piston.
- the spring rigidity can be increased. A sufficient length is available for all arms.
- the plate spring has an annular outer section, from which the arms extend radially inwards.
- the outer section can then be used for fixing the plate spring on the stop housing.
- the stop housing can, for example, have raised support faces, on which the plate spring bears on the housing.
- the outer section has fixing openings, slots separating adjacent arms from each other extending into an area between the fixing openings. Then, also another share of the outer section can be utilised for the length of the spring arms. At the same time, screws can be guided through the fixing openings, which then retain the spring in a correct position in relation to the stop housing. A turning of the plate spring in relation to the spring housing is thus precluded.
- the plate spring and the stop housing have an auxiliary positioning device, which ensures an allocation by angle of the plate spring and the stop housing in relation to each other.
- the plate spring is made with several spiral-shaped arms, it is expedient to ensure that each arm faces a correspondingly spiral-shaped stop in the stop housing. The more accurate the allocation of stop and arm can be ensured, the more accurate is the control of the working behaviour of the linear motor.
- a central area of the plate spring has an opening, through which is guided an element connected with the piston.
- the arms are connected with each other in the middle through the central area.
- the opening is a simple opportunity of connecting the spring with the piston or with the piston via the armature, respectively.
- the stop is located on a side of the linear motor facing away from the cylinder.
- sufficient space is available.
- the stop neither prevents the movement of the piston in the cylinder, nor will design measures be required to provide a space for the stop at the cylinder-side end of the linear motor.
- FIG. 1 a schematic longitudinal view through a linear compressor
- FIG. 2 a top view of a plate spring
- FIG. 3 a top view of a stop
- FIG. 4 a section IV-IV according to FIG. 3
- FIG. 5 a schematic view of the spring characteristic of the resonance spring
- FIG. 6 a perspective view of the resonance spring arrangement
- FIG. 7 the resonance spring according to FIG. 6 in a partial section.
- FIG. 1 shows a linear compressor 1 , which is located in a hermetically closed capsule 2 .
- the linear compressor 1 has a compression section 3 , a driving section 4 and a resonance spring arrangement 5 .
- the unit formed by the compression section 3 , the driving section 4 and the resonance spring arrangement 5 is suspended in the capsule 2 by means of two plane annular springs 6 , 7 , each in the shape of a spiral with one winding.
- the annular springs 6 , 7 are fixed on the driving section 4 .
- the compression section 3 has a cylinder 8 , whose front side is covered by a cylinder head 9 .
- the cylinder 8 and the cylinder head 9 are joined by a capsule 10 in the manner of a cartridge.
- a suction muffler 11 and a pressure muffler 12 are fixed on the cylinder head 9 .
- the suction muffler 11 is connected with a suction opening 13 and the pressure muffler 12 is connected with a pressure opening 14 in the cylinder head.
- the capsule 10 is inserted in an intermediary ring 15 , which is connected with the driving section 4 .
- the capsule 10 and thus the cylinder 8 are displaceable in relation to the intermediary ring 15 within certain limits in the axial direction of the cylinder.
- the capsule 10 is fixed in the intermediary ring 15 , for example by means of welding, soldering or gluing.
- a piston 16 which borders a compression chamber 17 together with the cylinder 8 and the cylinder head 9 .
- the driving section 4 has a linear motor.
- the linear motor has an outer stator 18 with a recess 19 for a winding, not shown in detail, and an inner stator 20 .
- an annular gap 21 Between the outer stator 18 and the inner stator 20 is located an annular gap 21 , in which an armature 22 is movable.
- the armature carries permanent magnets 23 , which are connected with each other by means of two rings 24 , 25 .
- the rings 24 , 25 can, for example, be made of plastic.
- the rings 24 , 25 are connected with inner rings 26 , 27 via arms, not shown in detail, which are guided through slots in the inner stator 20 .
- the inner rings 26 , 27 are connected with a piston rod 28 , which again is connected with the piston 16 .
- the outer stator 18 and the inner stator 20 are connected with each other through motor covers 29 , 30 , which are mutually interlocked by means of screw bolts 31 .
- the screw bolts are guided in parallel to the movement direction of the piston rod 28 .
- the intermediary ring 15 is connected with the cylinder-side motor cover 30 , for example by welding, gluing or soldering.
- the concentric design of motor cover 30 , intermediary ring 15 , capsule 10 and cylinder 8 causes that the longitudinal axes of the piston rod 28 and the cylinder 8 are coincident. This reduces the frictional losses between piston and cylinder. Any small tolerance errors are equalised by a ball joint between the piston rod and the piston.
- the resonance spring arrangement 5 which is located at an end of the driving section 4 opposite to the compression section 3 , has a spring pack 32 of several plate springs 33 .
- the spring pack 32 is connected with the piston rod 28 .
- An outer section 35 of the spring pack 32 is connected via bolts 36 with a stop housing 37 , which forms a stop for the spring pack 32 .
- the piston rod 28 is connected with an oil pump arrangement 38 that is immersed in an oil sump, not shown in detail, which forms in the lower part of the capsule 2 .
- the resonance spring arrangement 5 is adapted to the frequency of the current, so that the movable part of the linear compressor 1 , which is formed by the armature 22 , the piston rod 28 , the piston 16 , the oil pump arrangement 38 and the moved part of the resonance spring arrangement 5 , oscillates in resonance.
- FIG. 2 shows a top view of a plate spring 33 with the outer section 35 and the middle section 34 .
- the middle section 34 has an opening 39 , through which the piston rod 28 is guided.
- In the outer section are located several fixing openings 40 , through which the bolts 36 are guided to connect the spring pack 32 with the stop housing 37 .
- the middle section 34 is connected with the outer section 35 via several arms 41 , in the present embodiment three arms 41 . These arms are located to be spiral-shaped, each spiral practically travelling an angle of 360°.
- the arms 41 are surrounded by slots 42 .
- the slots 42 extend into the outer section 35 , that is, in an area between fixing openings 40 .
- FIG. 6 shows the spring pack 32 in the deflected state.
- the stop housing 37 shown in a top view in FIG. 3 and in a section in FIG. 4 , firstly has threaded bores 43 , which can receive the bolts 36 for fixing the spring pack 32 on the stop housing 37 .
- the connection between the spring pack 32 and the stop housing 37 can of course also be made with other suitable means, for example, rivets.
- the threaded bores 43 are surrounded by a projection 44 , which ensures that in the non-deflected state the spring pack 32 has a predetermined distance to the stop housing 37 .
- the stop housing has a central opening 45 , through which the piston rod 28 is guided.
- the stop housing 37 has two positioning bores 46 , through which fitting pins, not shown in detail, can be guided, which ensure together with corresponding positioning bores 47 in the plate spring 33 that the spring pack 32 has a predetermined angle alignment to the stop housing 37 .
- the stop housing 37 has a stop 48 , which extends, in an equally spiral-shaped manner from the radial outside towards the radial inside, in the form of a continuous projection projecting from the stop housing 37 in the direction of the spring pack.
- the stop 48 has a convex rounded surface, on which the arms 41 will rest in turn.
- the stops 48 are adapted to the arms 41 , or rather to the deformation behaviour of the arms 41 , in such a manner that during a displacement of the middle section 34 in the direction of the stop housing 37 , the arms 41 will eventually come to rest on the stops 48 .
- the stop face of the arms 41 on the stops 48 increases with an increasing stroke of the middle section 34 .
- the exact course of the stops 48 can be found by simple calculations or tests. For example, the inclination of the stops 48 from the outside to the inside can be changed.
- the spring pack 32 which is already connected with the piston 16 via the piston rod 28 , can be brought to rest on the stop housing 37 .
- This position corresponds to the upper dead point of the piston 16 .
- the cylinder 8 with its capsule 10 is then displaced so far into the intermediary ring 15 that the compression chamber assumes its minimum volume. Accordingly, the minimum distance exists between the piston 16 and the cylinder head 9 . In this position, the capsule 10 is then connected to the intermediary ring 15 .
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Compressor (AREA)
Abstract
The invention concerns a linear compressor (1) with a piston (16) reciprocating in a cylinder (8), a linear motor acting upon the piston (16) and a resonance spring arrangement (5) connected with the piston (16). It is endeavoured to reliably avoid damaging the compressor during operation.
For this purpose, the resonance spring arrangement (5) has a fixed stop (48) allocated to the upper dead point of the piston (16).
Description
- The invention concerns a linear compressor with a piston reciprocating in a cylinder, a linear motor acting upon the piston and a resonance spring arrangement connected with the piston.
- The linear motor of such a linear compressor has a stator and an armature moving in relation to the stator and being connected with the piston. When the armature reciprocates, the piston reciprocates accordingly, thus increasing and reducing a compression chamber in the cylinder. A resonance spring arrangement is connected with the piston or with the armature, said arrangement being adapted to the operation frequency of the linear motor. The linear motor is then operated in the resonance frequency of the spring.
- With a piston operated by a rotation motor via a crankshaft, the position of the piston in the upper dead point can be determined accurately. With a linear motor this is not possible. By means of a design of the linear motor, it can be determined for each operation area, where the upper dead point of the piston approximately is, that is, the dead point at which the compression chamber in the cylinder has its smallest extension. As soon as the operation conditions change, for example the pressures in a refrigeration system, which is supplied by the linear compressor, there is a risk that the piston strikes the front side of the cylinder. As usually inlet and outlet valves are located here, such a stroke can cause substantial damage. If a security distance were used, the remaining dead space in the cylinder would be too large, which would reduce the efficiency.
- A linear compressor as mentioned in the introduction is known from U.S. Pat. No. 6,783,335 B2. The resonance spring is located on the side of the armature facing away from the piston. An anti-collision device is connected with the resonance spring, said device having an elastic element and a damping element. An excessive movement of the piston will cause the middle section of the resonance spring to strike the damping element, the impact being further damped by the elastic element, which deforms elastically for the damping. However, this does not provide the opportunity of a final setting of a defined end position for the piston.
- U.S. Pat. No. 6,056,519 shows a possible embodiment of a resonance spring arrangement. The resonance spring consists of a stack of several plate spring plates, each spring plate having several mutually interlocked spring arms, which are formed by slots in the plates.
- U.S. Pat. No. 6,755,627 B2 shows a further linear compressor with an anti-collision device, which is located at the piston side end of the armature, between the stator and the armature. Before reaching the upper dead point of the piston, the armature strikes a spring arm and moves it until the spring arm strikes an elastic damping element. The elastic damping element is still deformable to a certain extent, however, with increased resistance. This does not either provide setting of a defined end position of the piston.
- U.S. Pat. No. 6,779,984 B2 proposes a different method. Here a sensor is provided, which indicates the reaching of the upper dead point of the piston. The sensor then controls the electrical supply to the linear motor so that a striking of the piston on the front wall of the cylinder is prevented. Such a control, however, is relatively expensive.
- The invention is based on the task of reliably preventing a damaging of the compressor during operation.
- With a linear compressor as mentioned in the introduction, this task is solved in that the resonance spring arrangement has a fixed stop allocated to the upper dead point of the piston.
- The stop thus provides a well-defined and fixed stop position for the piston in the upper dead point. When the piston is in the upper dead point, the resonance spring arrangement bears on the stop and permits no further movement. A damping element, which could be deformed when reaching the stop, is not available and not necessary either. When the spring bears on the stop, it has already been deformed. The heavier the deformation, the larger the deformation resistance. The impact of the resonance spring arrangement on the stop thus occurs in the area of a lower speed, the impact being, in fact, damped already.
- Preferably, the cylinder and the stop are displaceable in relation to each other in the movement direction of the piston during the mounting of the linear compressor. This provides a simple manner of setting the dead space in the cylinder. An external force moves the piston so far that the resonance spring arrangement bears on the stop. The piston is thus in its “upper dead point”, that is, in a position, in which the compression chamber in the cylinder shall have its smallest extension. In this position, the cylinder is now displaced so far in relation to the piston that the dead space has the desired minimum volume. In this position the cylinder is then fixed, for example connected with a fixture, which again is connected with the stator of the linear motor.
- Preferably, the resonance spring arrangement has at least one plate spring, which gradually comes to rest on the stop, when the piston moves in the direction of its upper dead point. Thus, a sudden impact of the resonance spring arrangement on the stop is avoided. On the contrary, the free spring length is reduced gradually with the movement of the piston towards its upper dead point, which causes that the rigidity of the resonance spring arrangement is accordingly increased. When the plate spring then rests completely on the stop, the piston has reached its upper dead point. When, during the pressure stroke of the compressor, the plate spring can successively roll on the stop, stop noises are reduced and the life of the plate spring is increased. Further, the shape, particularly the inclination, of the stop permits a very accurate setting of the characteristic of the resonance spring system. The same plate springs can also be used for different compressors. The spring properties can then be influenced via the stop.
- Preferably, the stop is located in a stop housing, whose extension is adapted to the cross-section of the linear motor. In other words, the stop housing has the same outer diameter as the linear motor, deviations in both directions being possible to a certain extent, as long as the stop housing does not collide with an enclosure, in which the linear motor is adapted. Then, the space provided by the enclosure can be used to its full extent, so that the resonance spring arrangement can be relatively large.
- Preferably, the plate spring has in the unloaded state a predetermined distance to the stop housing. Thus, the plate spring can initially move a distance before starting to rest on the stop.
- Preferably, the stop has a convex contact surface. Thus, the total width of the spring arms of the plate spring will not come to rest on the stop surface, but only a partial area, as the stop is arched. This may prevent a possible sticking of the plate spring, which might, for example, be caused by a lubrication oil film. Further, excessive tensions in the material of the plate spring are prevented, if the impact of the plate springs on the stop housing does not occur exactly parallel to the stop surface, but with an edge. This also makes it possible to keep the noises small.
- Preferably, the plate spring has at least one arched arm. Thus, a relatively long arm can be realised, that is, the length of the arm is not limited by the radius of the stop housing.
- It is preferred that the plate spring has several arched arms, which are located and mutually interlocked in the form of several spirals. This provides a simple manner of preventing a tilting moment on the armature or on the piston. The spring rigidity can be increased. A sufficient length is available for all arms.
- Preferably, the plate spring has an annular outer section, from which the arms extend radially inwards. The outer section can then be used for fixing the plate spring on the stop housing. The stop housing can, for example, have raised support faces, on which the plate spring bears on the housing.
- It is also advantageous, when the outer section has fixing openings, slots separating adjacent arms from each other extending into an area between the fixing openings. Then, also another share of the outer section can be utilised for the length of the spring arms. At the same time, screws can be guided through the fixing openings, which then retain the spring in a correct position in relation to the stop housing. A turning of the plate spring in relation to the spring housing is thus precluded.
- Preferably, the plate spring and the stop housing have an auxiliary positioning device, which ensures an allocation by angle of the plate spring and the stop housing in relation to each other. When the plate spring is made with several spiral-shaped arms, it is expedient to ensure that each arm faces a correspondingly spiral-shaped stop in the stop housing. The more accurate the allocation of stop and arm can be ensured, the more accurate is the control of the working behaviour of the linear motor.
- Preferably, a central area of the plate spring has an opening, through which is guided an element connected with the piston. Thus, the arms are connected with each other in the middle through the central area. The opening is a simple opportunity of connecting the spring with the piston or with the piston via the armature, respectively.
- Preferably, the stop is located on a side of the linear motor facing away from the cylinder. Here, sufficient space is available. Thus, the stop neither prevents the movement of the piston in the cylinder, nor will design measures be required to provide a space for the stop at the cylinder-side end of the linear motor.
- In the following, the invention is described on the basis of a preferred embodiment in connection with the drawings, showing:
-
FIG. 1 a schematic longitudinal view through a linear compressor -
FIG. 2 a top view of a plate spring -
FIG. 3 a top view of a stop -
FIG. 4 a section IV-IV according toFIG. 3 -
FIG. 5 a schematic view of the spring characteristic of the resonance spring -
FIG. 6 a perspective view of the resonance spring arrangement -
FIG. 7 the resonance spring according toFIG. 6 in a partial section. -
FIG. 1 shows alinear compressor 1, which is located in a hermeticallyclosed capsule 2. - The
linear compressor 1 has acompression section 3, adriving section 4 and aresonance spring arrangement 5. The unit formed by thecompression section 3, thedriving section 4 and theresonance spring arrangement 5 is suspended in thecapsule 2 by means of two plane annular springs 6, 7, each in the shape of a spiral with one winding. Theannular springs driving section 4. - The
compression section 3 has a cylinder 8, whose front side is covered by acylinder head 9. The cylinder 8 and thecylinder head 9 are joined by acapsule 10 in the manner of a cartridge. Asuction muffler 11 and apressure muffler 12 are fixed on thecylinder head 9. Thesuction muffler 11 is connected with asuction opening 13 and thepressure muffler 12 is connected with a pressure opening 14 in the cylinder head. - The
capsule 10 is inserted in anintermediary ring 15, which is connected with thedriving section 4. During mounting, thecapsule 10 and thus the cylinder 8 are displaceable in relation to theintermediary ring 15 within certain limits in the axial direction of the cylinder. When, as will be explained below, a predetermined position of the cylinder in relation to thedriving section 4 has been reached, thecapsule 10 is fixed in theintermediary ring 15, for example by means of welding, soldering or gluing. - In the cylinder 8 is located a
piston 16, which borders acompression chamber 17 together with the cylinder 8 and thecylinder head 9. - The
driving section 4 has a linear motor. The linear motor has anouter stator 18 with arecess 19 for a winding, not shown in detail, and aninner stator 20. Between theouter stator 18 and theinner stator 20 is located anannular gap 21, in which anarmature 22 is movable. The armature carriespermanent magnets 23, which are connected with each other by means of tworings rings rings inner rings inner stator 20. - The inner rings 26, 27 are connected with a
piston rod 28, which again is connected with thepiston 16. - The
outer stator 18 and theinner stator 20 are connected with each other through motor covers 29, 30, which are mutually interlocked by means ofscrew bolts 31. The screw bolts are guided in parallel to the movement direction of thepiston rod 28. - The
intermediary ring 15 is connected with the cylinder-side motor cover 30, for example by welding, gluing or soldering. The concentric design ofmotor cover 30,intermediary ring 15,capsule 10 and cylinder 8 causes that the longitudinal axes of thepiston rod 28 and the cylinder 8 are coincident. This reduces the frictional losses between piston and cylinder. Any small tolerance errors are equalised by a ball joint between the piston rod and the piston. - The
resonance spring arrangement 5, which is located at an end of thedriving section 4 opposite to thecompression section 3, has aspring pack 32 of several plate springs 33. In acentral area 34, thespring pack 32 is connected with thepiston rod 28. Anouter section 35 of thespring pack 32 is connected viabolts 36 with astop housing 37, which forms a stop for thespring pack 32. - At the end projecting from the
spring pack 32, thepiston rod 28 is connected with anoil pump arrangement 38 that is immersed in an oil sump, not shown in detail, which forms in the lower part of thecapsule 2. - When the winding located in the
recess 19 is energised, thearmature 22 moves in one direction taking along thepiston rod 28 in this direction. When the direction of the current is reversed, thearmature 22 with thepiston rod 28 moves in the opposite direction and accordingly also moves thepiston 16 in the opposite direction. This will periodically increase and reduce the volume of thecompression chamber 17. Theresonance spring arrangement 5 is adapted to the frequency of the current, so that the movable part of thelinear compressor 1, which is formed by thearmature 22, thepiston rod 28, thepiston 16, theoil pump arrangement 38 and the moved part of theresonance spring arrangement 5, oscillates in resonance. -
FIG. 2 shows a top view of aplate spring 33 with theouter section 35 and themiddle section 34. Themiddle section 34 has anopening 39, through which thepiston rod 28 is guided. In the outer section are located several fixingopenings 40, through which thebolts 36 are guided to connect thespring pack 32 with thestop housing 37. - The
middle section 34 is connected with theouter section 35 viaseveral arms 41, in the present embodiment threearms 41. These arms are located to be spiral-shaped, each spiral practically travelling an angle of 360°. - The
arms 41 are surrounded by slots 42. The slots 42 extend into theouter section 35, that is, in an area between fixingopenings 40. - When, now, a force acts upon the
middle section 34, it is displaced in relation to theouter section 35, namely, perpendicularly to the drawing level in relation to the view inFIG. 2 . This also applies, when several plate springs have been assembled to aspring pack 32.FIG. 6 shows thespring pack 32 in the deflected state. - The
stop housing 37, shown in a top view inFIG. 3 and in a section inFIG. 4 , firstly has threadedbores 43, which can receive thebolts 36 for fixing thespring pack 32 on thestop housing 37. The connection between thespring pack 32 and thestop housing 37 can of course also be made with other suitable means, for example, rivets. The threaded bores 43 are surrounded by aprojection 44, which ensures that in the non-deflected state thespring pack 32 has a predetermined distance to thestop housing 37. - Further, the stop housing has a
central opening 45, through which thepiston rod 28 is guided. Finally, thestop housing 37 has two positioning bores 46, through which fitting pins, not shown in detail, can be guided, which ensure together with corresponding positioning bores 47 in theplate spring 33 that thespring pack 32 has a predetermined angle alignment to thestop housing 37. - For each
arm 41, thestop housing 37 has astop 48, which extends, in an equally spiral-shaped manner from the radial outside towards the radial inside, in the form of a continuous projection projecting from thestop housing 37 in the direction of the spring pack. As is particularly clear fromFIG. 4 , thestop 48 has a convex rounded surface, on which thearms 41 will rest in turn. Thus, it is avoided that anarm 41 resting on thestop 48 gets stuck because of an oil film or comes to rest on the stop with an edge. On the contrary, eacharm 41 will always only rest on a part of the surface of thearched stop 48. - The stops 48 are adapted to the
arms 41, or rather to the deformation behaviour of thearms 41, in such a manner that during a displacement of themiddle section 34 in the direction of thestop housing 37, thearms 41 will eventually come to rest on thestops 48. Thus, the stop face of thearms 41 on thestops 48 increases with an increasing stroke of themiddle section 34. The exact course of thestops 48 can be found by simple calculations or tests. For example, the inclination of thestops 48 from the outside to the inside can be changed. - The increasing support of the
arms 41 on thestops 48 reduces the free section of thearms 41, and thus the section being available for resilient properties. Accordingly, thespring pack 32 will become more and more rigid, the more thespring pack 32 approaches thestop housing 37. This course is shown inFIG. 5 . Here a force F, which is required for the deformation, is shown via a displacement X of themiddle section 34 in relation to theouter section 35. It can be seen that in a contact point P also an increase of the force will not effect a further displacement of themiddle section 34. In this case, themiddle section 34 of thespring pack 32 will namely rest completely on thestops 48. - It can be seen that the stopping of the piston movement does not occur abruptly, but the
piston 16 is braked by a continuously increasing braking force. This gives a quiet operation with little wear. - For the mounting, the
spring pack 32, which is already connected with thepiston 16 via thepiston rod 28, can be brought to rest on thestop housing 37. This position corresponds to the upper dead point of thepiston 16. The cylinder 8 with itscapsule 10 is then displaced so far into theintermediary ring 15 that the compression chamber assumes its minimum volume. Accordingly, the minimum distance exists between thepiston 16 and thecylinder head 9. In this position, thecapsule 10 is then connected to theintermediary ring 15. - Multiple deviations from the embodiment shown can be imagined. In stead of a
resonance spring arrangement 5, which merely has plate springs 33, also a combination of at least oneplate spring 33, which can be moved up to thestop housing 37, and a helical or spiral spring can be used. In any case, it must be ensured, however, that theresonance spring arrangement 5 absolutely limits the movement of thepiston 16.
Claims (13)
1. Linear compressor with a piston reciprocating in a cylinder, a linear motor acting upon the piston and a resonance spring arrangement connected with the piston, characterised in that the resonance spring arrangement (5) has a fixed stop (48) allocated to the upper dead point of the piston (16).
2. Linear compressor according to claim 1 , characterised in that the cylinder (8) and the stop (48) are displaceable in relation to each other in the movement direction of the piston (16) during the mounting of the linear compressor (1).
3. Linear compressor according to claim 1 or 2 , characterised in that the resonance spring arrangement (5) has at least one plate spring (33), which gradually comes to rest on the stop (48), when the piston (16) moves in the direction of its upper dead point.
4. Linear compressor according to one of the claims 1 to 3 , characterised in that the stop is located in a stop housing, whose extension is adapted to the cross-section of the linear motor.
5. Linear compressor according to claim 4 , characterised in that the plate spring (33) has in the unloaded state a predetermined distance to the stop housing (37).
6. Linear compressor according to one of the claims 1 to 5 , characterised in that the stop (48) has a convex contact surface.
7. Linear compressor according to one of the claims 3 to 6 , characterised in that the plate spring (33) has at least one arched arm (41).
8. Linear compressor according to claim 7 , characterised in that the plate spring (33) has several arched arms (41), which are located and mutually interlocked in the form of several spirals.
9. Linear compressor according to claim 7 or 8 , characterised in that the plate spring (33) has an annular outer section (35), from which the arms (41) extend radially inwards.
10. Linear compressor according to claim 9 , characterised in that the outer section (35) has fixing openings (40), slots (42) separating adjacent arms (41) from each other extending into an area between the fixing openings (40).
11. Linear compressor according to one of the claims 3 to 10 , characterised in that the plate spring (33) and the stop housing (37) have an auxiliary positioning device (46, 47), which ensures an allocation by angle of the plate spring (33) and the stop housing (37) in relation to each other.
12. Linear compressor according to one of the claims 3 to 11 , characterised in that a central area (34) of the plate spring (33) has an opening (39), through which is guided an element (28) connected with the piston (16).
13. Linear compressor according to one of the claims 1 to 12 , characterised in that the stop (48) is located on a side of the linear motor facing away from the cylinder (8).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005038783.7 | 2005-08-17 | ||
DE102005038783A DE102005038783A1 (en) | 2005-08-17 | 2005-08-17 | linear compressor |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070041856A1 true US20070041856A1 (en) | 2007-02-22 |
Family
ID=37697255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/501,396 Abandoned US20070041856A1 (en) | 2005-08-17 | 2006-08-09 | Linear compressor |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070041856A1 (en) |
CN (1) | CN1952392A (en) |
DE (1) | DE102005038783A1 (en) |
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US20140193278A1 (en) * | 2011-07-04 | 2014-07-10 | Whirlpool S.A. | Adapting device for linear compressor, and compressor provided with such device |
US20140234145A1 (en) * | 2011-07-07 | 2014-08-21 | Whirlpool S.A. | Arrangement of components of a linear compressor |
US20140241911A1 (en) * | 2011-07-19 | 2014-08-28 | Whirlpool S.A. | Leaf spring and compressor with leaf spring |
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Also Published As
Publication number | Publication date |
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CN1952392A (en) | 2007-04-25 |
DE102005038783A1 (en) | 2007-02-22 |
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