CN1952392A

CN1952392A - Linear compressor

Info

Publication number: CN1952392A
Application number: CNA2006101495399A
Authority: CN
Inventors: P·E·汉森; K·赖因万德; K·伦茨; J·汤姆森; P·比耶勒; F·H·伊韦尔森; M·诺门森
Original assignee: Danfoss Compressors GmbH
Current assignee: Danfoss Power Solutions Parchim GmbH
Priority date: 2005-08-17
Filing date: 2006-08-16
Publication date: 2007-04-25
Also published as: US20070041856A1; DE102005038783A1

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.

Description

Linearkompressor

Technical field

The present invention relates to Linearkompressor, it has pistons reciprocating in cylinder body, and linear motor acts on the piston, and the resonant spring device connects piston.

Background technique

The linear motor of described Linearkompressor have stator and move with respect to stator and be connected rotor on the piston.When rotor moved back and forth, piston also correspondingly moved back and forth, and so just increased and reduced the volume of cylinder pressing chamber.The resonant spring device connects piston or rotor, and the operating frequency of described device and linear motor adapts.Therefore linear motor moves under the resonant frequency of spring.

Utilize revolution motor to pass through the arbor operated piston, piston can be determined exactly in the position of top dead center.This just can not realize but utilize linear motor.According to the design of linear motor, it can determine each operation area, when piston is positioned at top dead center substantially, just, is positioned at the overhang with minimum of the pressing chamber at dead point in cylinder body.When operating conditions one changes, the pressure in the refrigeration system that provides by Linearkompressor for example, that piston just has the danger of bump cylinder body front end.Usually terminal valve is arranged on here, and such bump just may cause the destruction of essence.If the interval of a safety is set, unnecessary dead space volume is too big in cylinder body so, can cause the reduction of efficient like this.

The Linearkompressor of mentioning in aforementioned is open in US 6783335 B2.Resonant spring is arranged on rotor surface one side of piston dorsad.Anti-collision equipment is connected on the resonant spring, and described device has elastic element and damping member.The transient motion of piston can cause the intermediate portion bump damping member of resonant spring, and such impact is further weakened by elastic element, and elastic element forms damping by resiliently deformable.Yet such method can not finally set out the dead center position that piston is determined.

US 6056519 has described the feasible embodiment of resonant spring device.Described resonant spring comprises the leaf spring plate that a pile is piled up, and each leaf spring strip has the spring arm in the groove that is formed on plate of several mutual lockings.

US 6755627 B2 have further described the Linearkompressor that has anti-collision equipment, and anti-collision equipment is arranged on the Rotor terminal of piston one side, between stator and rotor.Before arriving piston top dead center position, rotor bump spring arm and promotion spring arm clash into elastic damping element up to it.Along with the increase of resistance, described elastic damping element also can produce distortion in certain degree.Can not finally set out the dead center position that piston is determined like this.

US 6779984 B2 have described a kind of diverse ways.It uses sensor to show the position that the piston top dead center arrives.The electric current that sensor control is input to linear motor has stoped the front end of piston slap to cylinder body like this.But such control gear cost is too high.

Summary of the invention

The present invention is based on such purpose, promptly provide a kind of in operating process atraumatic reliably compressor.

Begin the described Linearkompressor of paragraph as the present invention, this purpose is achieved in that and fixing block is set to determine the top dead center position of piston on the resonant spring device.

Therefore described block offers the top dead center of piston with that determine and fixing stop position.When piston was positioned at top dead center, resonant spring device extruding block and prevention piston further moved.Therefore just be not provided with no longer yet yet need be behind contact blocks deformable damping member.When spring extruding block, can produce distortion.Amount of deformation is big more, and the rebounding force that distortion produces is big more.Therefore the resonant spring device is to take place in the zone of low speed for the impact of block, and in fact, the impact of this moment has weakened.

Preferably, cylinder body and block correspondingly are arranged on the movement direction of piston in the installation process of Linearkompressor.This just provides a kind of pattern that stops the zone that simply is provided with in cylinder body.External force makes piston motion, thereby makes the resonant spring device be squeezed on the block.This moment, piston was located in its " top dead center ", and just, in this position, the pressing chamber that is positioned at cylinder body has its minimum extension.In this position, cylinder body has desired minimum volume with respect to the piston setting so that it stops the zone thus.Fix at this position cylinder body, for example be connected on the fixing device, and fixing device is connected on the stator of linear motor.

Preferably, the resonant spring device has at least one leaf spring, when piston moves when its top dead center direction moves, described leaf spring step by step near and be squeezed on the block.Therefore, this has just been avoided the unexpected impact that the resonant spring device produces for block.On the contrary, along with the free length of piston free spring when its top dead center moves little by little reduces, this just makes the rigidity of resonant spring device correspondingly increase.When leaf spring was squeezed on the block fully, piston had just arrived its top dead center.Under the compression shock of compressor, leaf spring is squeezed on the block constantly, and the noise that piston stops being produced reduces and increased the working life of leaf spring.In addition, the shape of block specifically has the shape of inclination, has the characteristic that allows point-device assembling that the resonant spring system carries out.Same leaf spring also can be used for the compressor of other types.Its resiliency characteristics can change by block.

Preferably, block is arranged in the block frame, the cross section fit of its extension and linear motor.In other words, the block frame has the outer dia identical with linear motor, as long as the block frame does not conflict mutually with the shell that matches with motor, it may be limited within certain scope in the deviation on the direction of both ends.Therefore, by being utilized that the space that shell provided may maximum limit, so so that the resonant spring device can be relatively bigger.

Preferably, leaf spring does not have under flexible state and has definite distance between the block frame at it.Therefore, leaf spring from the incipient stage to before being expressed on the block, moving certain distance.

Preferably, block has crooked contact surface.Therefore, the whole width of the spring arm of leaf spring can not be squeezed in the only part zone on the surface of block fully, because block is an arch.Can prevent the bonding that leaf spring is possible like this, for example, it might be because the bonding that lubricant film caused.In addition, not to occur in the surface that just in time is parallel to block but prevented that the transition of leaf spring material from stretching during the edge yet if be positioned at the impact of the leaf spring on the block frame.So also can be used for keeping the little noise that makes.

Preferably, leaf spring has at least one arch side arm, like this, can obtain long relatively side arm, and just, the length of side arm is not subjected to the restriction of the radius of block frame.

Preferably, leaf spring has a plurality of arch side arms, and they constitute and interlocking with the form of a plurality of helixes.So just provide a kind of simple mode to prevent to produce heeling moment at piston or on rotor.The rigidity of spring has also increased.All side arms can have enough length.

Preferably, leaf spring has the external lateral portion of ring-type, and side arm is extending internally radially therein.External lateral portion can be used for fixing the leaf spring that is positioned on the block frame.For example: the block frame can have outstanding stayed surface, leaf spring extruding block frame on stayed surface.

It is also advantageous in that, when external lateral portion has fixing opening, trench isolations is opened contiguous side arm, and side arm extends into the zone between the permanent opening mutually.Therefore, another shared portion of external lateral portion also can be used for the length of spring arm.Simultaneously, bolt also can be introduced by fixing opening, and it can be held in the correct position spring with respect to the block frame.Also avoided the bending of leaf spring thus with respect to the block frame.

Preferably leaf spring and block frame have auxiliary positioning device, and it guarantees to keep mutually between leaf spring and the block frame definite angle.When leaf spring is provided with a plurality of spiral helicine side arm, guarantee that preferably each side arm is towards corresponding spiral helicine block in the block frame.Accurate in locating guarantee between block and side arm is many more, can control accurately the operating characteristic of linear motor more.

Preferably, the zone line of leaf spring has opening, is connected with piston by this opening induction element, and therefore, side arm interconnects at the middle part by zone line.Described opening makes leaf spring connect piston or connect piston by rotor separately and becomes very simple.

Preferably, block is arranged on a linear motor side of cylinder dorsad.At this, enough spaces can be arranged.Therefore, block neither can stop the motion of piston in the cylinder body, can also design and measure the end that needed space is used for block is arranged on the relative cylinder body of linear motor.

Next, will come the present invention in conjunction with the accompanying drawings and according to the introduction of a preferred embodiment.As follows:

Description of drawings

Fig. 1 is a schematically view longitudinally of Linearkompressor;

Fig. 2 is the top view of planar spring;

Fig. 3 is the top view of block;

Fig. 4 is the IV-IV sectional view shown in Fig. 3;

Fig. 5 is the resiliency characteristics schematic representation of resonant spring.

Fig. 6 is the perspective view of resonant spring device;

Fig. 7 is the partial cross section figure of the resonant spring among Fig. 6;

Embodiment

What Fig. 1 showed is Linearkompressor 1, and it is arranged in hermetically enclosed housing 2.

Described Linearkompressor 1 has compression member 3, drive part 4 and resonant spring device 5.By compression member 3, the compressor unit that drive part 4 and resonant spring device 5 form is suspended in the housing 2 by two flat ring-

springs

6,7, and each spring all forms the shape of the winding of a screw type.Ring-

spring

6,7 is fixed on the drive part 4.

Compression member 3 comprises cylinder body 8, and the cylinder body front end is coated with cylinder cap 9.Cylinder body 8 is connected with the housing 10 of cylinder cap 9 by cylindrical shape.Absorbing silencer 11 and pressure baffler 12 are fixed on the cylinder cap 9.In cylinder cap, absorbing silencer 11 connects suction opening 13, and pressure baffler 12 connects pressure opening 14.

Housing 10 is inserted in the central ring 15 that is connected drive part 4.In assembly process, housing 10 and cylinder body 8 can be replaced with respect to the central ring 15 that is subjected to certain limitation on the axial direction of cylinder body.As will be explained below, when cylinder body driver part 4 reached preposition, for example by modes such as welding, soldering, gummeds, housing 10 just was fixed in the central ring 15.

Be provided with piston 16 in the cylinder body 8, it has defined pressing chamber 17 by cylinder body 8 and cylinder cap 9.

Drive part 4 has linear motor, and the outer stator 18 of described linear motor has the recess 19 that is used to weld, and is not shown specifically, and it also is provided with internal stator 20.Externally be provided with annular gap 21 between stator 18 and the internal stator 20, wherein have transportable rotor 22.Described rotor has permanent magnet 23, and they interconnect by two rings 24,25.

Ring

24,25 can be by constituting as plastic or

other material.Ring

24,25 connects

inner loop

26,27 by the side arm that does not have to show in detail, and side arm is guided by the slit that is positioned at internal stator 20.

Inner loop

26,27 connects piston rod 28, and piston rod is connected with piston 16 again.

Outer stator 18 and internal stator 20 interconnect by

motor cover

29,30, and lock mutually by bolt 31.The bolt that is provided with is parallel to the movement direction of piston rod 28.

Central ring 15 connects the motor cover 30 of cylinder body one side by modes such as for example welding, soldering, gummeds.Motor cover 30, central ring 15, the concentric design of housing 10 and cylinder body 8 makes piston rod 28 consistent with the longitudinal axis of cylinder body 8.So just reduced the friction between piston and the cylinder body.Some little offset error are by the compensation of the ball-joint between piston rod and piston.

Resonant spring device 5 is arranged on the end of drive part 4 with respect to compression member 3, and has the bridle 32 that is formed by a plurality of leaf springs 33.In the center region 34, bridle 32 connects piston rods 28.The external lateral portion 35 of bridle 32 connects block frame 37 by bolt 36, and it has constituted the block of bridle 32.

At the terminal projection that stretches out from bridle 32, piston rod 28 is connected to the oil pump device 38 that is immersed in the fuel tank, does not have detailed demonstration, this part be formed at housing 2 than lower part.

After giving the winding energising that is arranged in recess 19, rotor 22 is being with piston rod 28 to move to this direction in one direction.When current direction was reverse, the rotor 22 that has piston rod 28 moved towards opposite direction, therefore also drove piston 16 and moved towards opposite direction.Will periodically increase volume like this with compresses chamber 17.Resonant spring device 5 adapts with the frequency of electric current, so so that Linearkompressor 1 by rotor 22, piston rod 28, piston 16, the moving element that the movable part of oil pump device 38 and resonant spring device 5 constitutes produce vibration resonance.

The top view of leaf spring 33 as shown in Figure 2, it has external lateral portion 35 and intermediate portion 34.Intermediate portion 34 has the opening 39 that guiding piston rod 28 passes through.Set up separately in the lateral part and to be equipped with some fixing openings 40, bolt 36 links together bridle 32 and block frame 37 by the guiding of permanent opening 40.

Intermediate portion 34 connects external lateral portion 35 by a plurality of side arms 41, has three side arms 41 in this embodiment.These side arms are arranged to the shape of spiral, and each spiral almost revolves the three-sixth turn angle.

Groove 42 is round side arm 41, and groove 42 extends in the external lateral portion 35, just, and between the zone of permanent opening 40.

Now, when masterpiece was used on the intermediate portion 34, it had just transferred to external lateral portion 35, that is to say, with respect to position shown in Figure 2 perpendicular to paper.So also having shown has some leaf springs to be arranged at bridle 32 at this moment.Fig. 6 shows the state of bridle 32 deflections.

Top view as shown in Figure 3 and sectional view shown in Figure 4, block frame 37 at first is threaded hole 43, and it is used for fitted bolt 36 bridle 32 is fixed in block frame 37.Certainly also can utilize other modes that are fit to being connected between bridle 32 and the block frame 37, for example rivet connects.Be provided with projection 44 around tapped hole 43, it can be guaranteed not to be between bridle 32 under the deflection state and the block frame 37 and has predetermined distance.

In addition, the block frame has middle opening 45, and piston rod 28 passes therein.Block frame 37 also has two positioning holes 46, utilizes them to position it with pin, be not shown specifically herein, this just the corresponding positioning hole on leaf spring 33 47 guaranteed to have predetermined angle between bridle 32 and the block frame 37.

For each side arm 41, block frame 37 has the block 48 that stretches out, its with etc. spiral-shaped mode from radial outside towards radially inner side, form with the form of continuous projection outstanding in the direction of bridle from block frame 37.Can see too clearly from Fig. 4, block 48 has the curve arc-shaped surface, and the side arm 41 on it sets gradually.Therefore, this is stuck because of oil film or because being arranged on the edge section of block with regard to the side arm of having been avoided being arranged on the block 48 41.On the contrary, each side arm 41 will only be squeezed on the surface portion of arch block 48 always.

Block 48 matches with side arm 41, perhaps further matches with the deformation performance of side arm 41, and by this way, when on the direction that intermediate portion 34 is moved to block frame 37, side arm 41 will finally be squeezed on the block 48.Like this, the terminal surface that is positioned at the side arm 41 on the block 48 increases by the stroke that intermediate portion 34 has increased.The state accurately of block 48 can be at an easy rate by calculating or testing and determine.For example, can change the inclination of block 48 from the outside to the inboard.

The support that is positioned at the increase of the side arm 41 on the block 48 has reduced the free part of side arm 41, and this part is used for obtaining resiliency characteristics.Therefore, along with bridle 32 becomes more and more harder, bridle 32 also can lean on tightly more with block frame 37.This process shows corresponding to the displacement amount X of intermediate portion 34 with respect to external lateral portion 35 at this power F that is used for producing distortion as shown in Figure 5.Can see promptly exerts all one's strength at point of contact P again increases, and also can not exert an influence for the displacement of intermediate portion 34 again.In this case, the intermediate portion 34 of bridle 32 also will be squeezed on the block 48 fully.

The action of piston can not stop suddenly as can be seen, but at the braking force effect lower piston 16 that continues to increase with stop motion.This just makes operating process become quiet and almost not wearing and tearing.

In assembling, the bridle 32 that is connected to piston 16 by piston rod 28 can be arranged to be squeezed on the block frame 37.This position is corresponding to the top dead center of piston 16.Cylinder body 8 and housing 10 thereof are arranged among the degree of depth of central ring 15 maximums more so so that the volume minimum of pressing chamber.Therefore, have minimum distance between piston 16 and the cylinder cap 9.In this position, housing 10 is connected in the central ring 15.

It is contemplated that multiple other setting by present embodiment.Without resonant spring device 5, it only utilizes a plurality of leaf springs 33, but can be set at least one leaf spring 33 combination on the block frame 37, perhaps utilizes helical or spiral spring.Under situation arbitrarily, all must determine, in any case, resonant spring device 5 complete limited piston 16 mobile.

Claims

1, a kind of Linearkompressor, it has pistons reciprocating in cylinder body, linear motor acts on the piston, and the resonant spring device is connected with piston, and it is characterized in that: described resonant spring device (5) utilizes fixed stop (48) to determine the top dead center of piston (16).

2, Linearkompressor as claimed in claim 1 is characterized in that correspondingly being arranged on the movement direction of piston (16) at cylinder body described in the installation process of Linearkompressor (1) (8) and block (48).

3, Linearkompressor as claimed in claim 1 or 2, it is characterized in that resonant spring device (5) has at least one leaf spring (33), when piston (16) moves when its top dead center direction moves, described leaf spring step by step near and be squeezed on the block (48).

4,, it is characterized in that block is arranged in the block frame, the cross section fit of its extension and linear motor as the described Linearkompressor of one of claim 1 to 3.

5, Linearkompressor as claimed in claim 4 is characterized in that leaf spring (33) does not have under flexible state and has definite distance between the block frame (37) at it.

6,, it is characterized in that block (48) has crooked contact surface as the described Linearkompressor of one of claim 1 to 5.

7,, it is characterized in that leaf spring (33) has at least one arch side arm (41) as the described Linearkompressor of one of claim 3 to 6.

8, Linearkompressor as claimed in claim 7 is characterized in that leaf spring (33) has a plurality of arch side arms (41), and they constitute and interlocking with the form of a plurality of helixes.

9, as claim 7 or 8 described Linearkompressors, it is characterized in that leaf spring (33) has the external lateral portion (35) of ring-type, described side arm (41) is extending internally radially therein.

10, Linearkompressor as claimed in claim 9 is characterized in that external lateral portion (35) has fixing opening (40), and groove (42) is kept apart contiguous side arm (41), and side arm extends into the zone between the permanent opening (40) mutually.

11, as the described Linearkompressor of one of claim 3 to 10, it is characterized in that leaf spring (33) and block frame (37) have auxiliary positioning device (46,47), it guarantees to keep mutually between leaf spring (33) and the block frame (37) definite angle.

12, as the described Linearkompressor of one of claim 3 to 11, it is characterized in that the zone line (34) of leaf spring (33) has opening (39), be connected with piston (16) by this opening induction element (28).

13,, it is characterized in that block (48) is arranged on a linear motor side of cylinder (8) dorsad as the described Linearkompressor of one of claim 1 to 12.