CN100396930C - Scroll compressor - Google Patents

Scroll compressor Download PDF

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Publication number
CN100396930C
CN100396930C CNB2004800066427A CN200480006642A CN100396930C CN 100396930 C CN100396930 C CN 100396930C CN B2004800066427 A CNB2004800066427 A CN B2004800066427A CN 200480006642 A CN200480006642 A CN 200480006642A CN 100396930 C CN100396930 C CN 100396930C
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CN
China
Prior art keywords
described
body
fixed scroll
scrollwork
scroll compressor
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CNB2004800066427A
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Chinese (zh)
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CN1759249A (en
Inventor
森本敬
二上义幸
鶸田晃
辻本力
Original Assignee
松下电器产业株式会社
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Priority to JP2003357706 priority Critical
Priority to JP357706/2003 priority
Priority to JP39421/2004 priority
Application filed by 松下电器产业株式会社 filed Critical 松下电器产业株式会社
Publication of CN1759249A publication Critical patent/CN1759249A/en
Application granted granted Critical
Publication of CN100396930C publication Critical patent/CN100396930C/en

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Abstract

A scroll compressor, wherein an approximately annular seal part in slidable contact with the end plate of a rotary scroll while spreading from the outermost peripheral inner wall surface of a lap to the outside to have the external wall surface of a fixed scroll roughly along the inner wall surface, an approximately annular recessed part positioned on the outside of the approximately annular seal part, and a recessed part communicating with the suction port of the fixed scroll in the independent form of the approximately annular recessed part are formed in the opposed surface of the fixed scroll to the end plate of the rotary scroll positioned around the outside of the lap. Thus, since a back pressure on the rotary scroll is increased, the overturning phenomenon of the rotary scroll can be suppressed.

Description

Scroll compressor

Technical field

The application relates to a kind of scroll compressor, and this compressor is used for commercial style, household type or automobile-used refrigerating and air conditioning device, perhaps is used for the heat pump type water heating system.

Background technique

In such traditional scroll compressor, the fixed scroll body is provided with the ring packing part and is positioned at the partly annular recess (for example, seeing patent document 1) in the outside of sealing with the apparent surface of the motion vortex body end plate that detours.

Fig. 6 shows the traditional scroll compressor described in the patent document 1. as shown in Figure 6, fixed scroll body 202 has scrollwork 221b, and the operation scrollwork (not shown) that detours that is positioned at outside the scrollwork 221b has end plate. and ring packing part 213 and annular recess 214 are formed at and the be relatively fixed surface of vortex body 202 of end plate. and hermetic unit 213 extends into has outer wall surface 221c, this outer wall surface is extended to 215d along this internal surface 215a to 215d from the inner wall surface 215a of scrollwork 221b most peripheral basically, and the end plate sliding contact of sealing part and the operation vortex body that detours. and annular recess 214 is positioned at the outside of hermetic unit 213.

(patent document 1)

Japanese Patent Application Publication 2001-355584

Yet according to this traditional structure, even apply back pressure for the motion vortex body that detours, this same back pressure also can act on the annular recess 214, thereby back pressure is reduced. therefore, even apply predetermined back pressure pressure, the back pressure pressure of motion vortex body of detouring also is easy to reduce along with the operating conditions of scroll compressor. under the high efficiency trend of freezing air conditioner at present, scroll compressor very moves under low compression ratio continually, thereby just there is such problem, the motion vortex body that promptly detours can separate from the fixed scroll body under this operating conditions, and scroll compressor is known from experience upset at the operation motion vortex that the time detours. and, at the scroll compressor that is used for the heat pump type water heating system, depend on that water heating condition scroll compressor can move under the compression ratio more much lower than freezing air conditioner, the motion vortex body that detours also can separate from fixed scroll body 202 more continually.

The present invention has realized solving these traditional problems, and the object of the invention is to provide a kind of high-efficiency reliable scroll compressor, this compressor can reduce the skimming wear of propeller, the flop phenomenon of the motion vortex body that can also suppress simultaneously to detour when compressor moves with low compression ratio.

Summary of the invention

First aspect of the present invention provides a kind of scroll compressor, the fixed scroll body that wherein has scrollwork is engaged with each other with the motion vortex body that detours with end plate and scrollwork, thereby make the scrollwork of vortex body enter inside, the motion vortex body that detours rotates with the state that this rotation of detouring the motion vortex body is prevented from, propelling force when the motion vortex body that detours rotates is supported by the slidingsurface between end plate and the fixed scroll body, and by the back pressure pressure support that imposes on the motion vortex body back side of detouring, wherein be formed with: basic hermetic unit for annular with the motion vortex body end plate that detours in the fixed scroll body scrollwork outside vortex body surface that is relatively fixed, sealing partly extends into has outer wall surface, this outer wall surface stretches out along this inner wall surface from the inner wall surface of scrollwork most peripheral, and the end plate sliding contact of sealing part and the motion vortex body that detours; Be positioned at the basic basic recess outside the hermetic unit of annular that is for annular; And substantially be the recess that the mode of the recess of annular is communicated with the intakeport of fixed scroll body to be independent of.

By convention, intermediate pressure between high pressure or high pressure and the low pressure is applied in to recess to apply back pressure. according to this first aspect, low pressure air suction pressure is applied in to recess, the zone corresponding with recess is applied in pressure by the direction that the motion vortex body back pressure that detours increases, even and under the operating conditions that low compression ratio back pressure in service is tending towards reducing, the flop phenomenon of motion vortex body of detouring also can be inhibited. owing to formed recess, therefore guaranteed required basic hermetic unit for annular, advance the slide area at moving part place to reduce, thereby skimming wear also can reduce, low compression ratio compression efficiency in service can be improved, and the operating mechanical efficiency of high compression ratio and reliability also can be improved.

According to a second aspect of the invention, in the scroll compressor aspect first, the scrollwork of fixed scroll body is formed by curve, this curve extends to the position of twining terminal near the scrollwork of the motion vortex body that detours from the scrollwork winding terminal of fixed scroll body, and the scrollwork of the inner wall surface of curve extension part and fixed scroll body is continuous.

According to this aspect, because the scrollwork of curve and fixed scroll body is continuous, therefore its extension is as the passage of suction stroke or as the part of compression stroke, and compressor can move in holding in the situation that capacity differs from one another of some two compression chambers. in this case, be easy to produce pressure imbalance between the compression chamber, yet thereby exist the low compression ratio motion vortex body flop phenomenon that detours in service to quicken the unfavorable possibility that occurs., by the structure of this aspect, the flop phenomenon of the motion vortex body that detours can be inhibited and the efficient of compressor can be improved.

According to a third aspect of the present invention, in the scroll compressor aspect second, the curve continuous with fixed scroll body scrollwork is identical with the curve that forms fixed scroll body scrollwork.

According to this aspect, because the extension of second aspect is as compression chamber rather than air intake passage, yet therefore in all running statees, all can produce two pressure imbalances between the compression chamber., because the compression loss of suction unit office is reduced to minimum, therefore this extension is in being commonly used in the scroll compressor that is configured to raise the efficiency. and in such scroll compressor, the flop phenomenon of the motion vortex body that detours can be inhibited and can not produce the problem of pressure imbalance between the compression chamber.

According to a fourth aspect of the present invention, in the scroll compressor aspect first, basic hermetic unit for annular is provided with stria, and this stria extends to the position of twining terminal near the motion vortex body scrollwork that detours, and this stria is communicated with recess.

According to this aspect, extend to the position of the close motion vortex body scrollwork winding terminal that detours from the scrollwork winding terminal of fixed scroll body when the scrollwork of fixed scroll body, basic seal length for annular hermetic unit is reduced, if and the shape of the recess that is communicated with intakeport is restricted dimensionally. form two recesses and two strias and they are communicated with each other, just pressure of inspiration(Pi) can be imposed on the most of angular regions of motion vortex body end plate that detours, and the flop phenomenon of the motion vortex body that detours can be suppressed more effectively.

According to a fifth aspect of the present invention, in the scroll compressor aspect first, when the scrollwork thickness of fixed scroll body is defined as " t ", basic be the recess inner wall surface and the seal length between the fixed scroll body inner wall surface of the sealed department office of annular, and perhaps the seal length between stria and the fixed scroll body inner wall surface is with below the 3t more than the t/4.

According to this aspect, the seal length relevant with fixed scroll body inner wall surface is more than the t/4 and below the 3t. by this structure, can guarantee required minimum seal length, the recess of connection or stria also can maximize, and the flop phenomenon of the motion vortex body that can more effectively suppress to detour.

According to a sixth aspect of the invention, in the scroll compressor aspect the 5th, seal length between recess inner wall surface and the fixed scroll body inner wall surface, perhaps the seal length between stria and the fixed scroll body inner wall surface reduces gradually towards the scrollwork winding terminal of the motion vortex body that detours.

According to this aspect, the seal length relevant with fixed scroll body inner wall surface can change according to the pressure difference between compression chamber and the back pressure space to be set, and this structure can be optimized in the range of operation of scroll compressor.

According to a seventh aspect of the present invention, in the scroll compressor aspect the 4th, wherein when the scrollwork height of fixed scroll body was defined as Hmm, the degree of depth of recess or stria was that 0.1mm is above with below the H/3mm.

According to this aspect, if the degree of depth of recess or described stria is more than the 0.1mm, then can on the propelling slidingsurface of motion vortex body that detours, prevent the viscosity loss that lubricant oil produces, if the degree of depth of recess or described stria is below the H/3mm, then might avoid the problem that scrollwork intensity worsens and the scrollwork operating accuracy descends of fixed scroll body.

According to an eighth aspect of the present invention, in the scroll compressor aspect the 4th, the degree of depth of stria is less than concave depth.

According to this aspect, the processing resistance that stria adds man-hour or machine when making can reduce, and does not need to reduce processing speed and prevent that instrument is impaired.

According to a ninth aspect of the present invention, in the scroll compressor aspect first, scroll compressor is with the compression ratio operation less than design compression ratio, and this design compression ratio is determined by the scrollwork of the fixed scroll body and the motion vortex body that detours.

According to this aspect, might improve a kind of like this efficient of scroll compressor, in this scroll compressor, the inhibition of the motion vortex body flop phenomenon that detours has improved the compression efficiency in the range of operation and has made it be difficult to stablize, and might improve the efficient that runs on the scroll compressor under the low compression ratio in the high-efficiency freezing air conditioner of nearest appearance.

According to a tenth aspect of the present invention, in the scroll compressor of first to the 9th either side, high-pressure refrigerant is used as refrigeration agent.

According to this aspect, might prevent the increase of skimming wear in a kind of like this scroll compressor, in this scroll compressor, thereby the back pressure of the motion vortex body that detours makes the skimming wear that advances sliding parts also be tending towards increasing very greatly.In using the heat pump water heating system of carbon dioxide as refrigeration agent, scroll compressor moves under low-down compression ratio owing to system performance in some cases, even but might obtain scroll compressor efficiently too under this service condition.

According to an eleventh aspect of the present invention, in the scroll compressor of first to the 9th either side, carbon dioxide is used as refrigeration agent.

According to this aspect, might prevent the increase of skimming wear in a kind of like this scroll compressor, in this scroll compressor, thereby the back pressure of the motion vortex body that detours makes the skimming wear that advances sliding parts also be tending towards increasing very greatly. in using the heat pump water heating system of carbon dioxide as refrigeration agent, scroll compressor moves under low-down compression ratio owing to system performance in some cases, even but might obtain scroll compressor efficiently too under this service condition.

Description of drawings

Fig. 1 is the planimetric map of fixed scroll body, and this fixed scroll body is the major component of the present invention first (with second) embodiment's scroll compressor;

Fig. 2 is the amplification vertical sectional view of scroll compressor shown in Figure 1;

Fig. 3 is the vertical sectional view of first embodiment's scroll compressor;

Fig. 4 is the planimetric map of fixed scroll body, and this fixed scroll body is the major component of the present invention the 3rd (with the 4th) embodiment's scroll compressor;

Fig. 5 is the planimetric map of fixed scroll body, and this fixed scroll body is the major component of another embodiment's scroll compressor; And

Fig. 6 is the planimetric map of fixed scroll body, and this fixed scroll body is the major component of traditional scroll compressor.

Embodiment

(first embodiment)

Set forth embodiments of the invention below with reference to accompanying drawings. should note the invention is not restricted to these embodiments.

Fig. 1 is the planimetric map of fixed scroll body, this fixed scroll body is the major component of the present invention first (with second) embodiment's scroll compressor, Fig. 2 is the amplification vertical sectional view of scroll compressor shown in Figure 1, and Fig. 3 is the vertical sectional view of the scroll compressor of first embodiment of the invention.

In Fig. 1 and 2, in this embodiment's scroll compressor, fixed scroll body 12 has scrollwork 12b, and the motion vortex body 13 that detours that is positioned at the scrollwork 12b outside has end plate 13a. fixed scroll body 12 and is formed with basic hermetic unit 108 for annular with end plate 13a facing surfaces, be arranged in basic be basic recess 105 and recess 104 (the grid line part of Fig. 1) outside the hermetic unit 108 of annular for annular, this recess 104 substantially be that the mode of the recess 105 of annular is communicated with the intakeport 17 of fixed scroll body 12 to be independent of. be thereby that the hermetic unit 108 of annular stretches out and has outer wall surface 102 substantially, this outer wall surface basically from the inner wall surface 101 of the scrollwork 12b most peripheral of fixed scroll body 12 along these inner wall surface 101 extensions. be the end plate 13a sliding contact of the annular hermetic unit 108 and the motion vortex body 13 that detours substantially.

The operation and the function that below elaboration are had the scroll compressor of said structure.

Shown in Fig. 1 to 3, in this embodiment's scroll compressor, the scrollwork 12b that rises from the end plate 12a of fixed scroll body 12 and be engaged with each other and form compression chamber 15. betwixt when detouring motion vortex body 13 when circular track rotates and is rotated simultaneously constraint mechanism 14 constraints and rotates from the scrollwork 13b that the end plate 13a of the motion vortex body 13 that detours rises, compression chamber 15 is moved and changes its volume simultaneously, thereby carry out air-breathing, compression and exhaust operation. at this moment, predetermined back pressure is applied in to the back side, especially the outer peripheral portion of motion vortex body 13 detours, the motion vortex body 13 that detours does not separate and rotates from fixed scroll body 12, thereby stably carries out air-breathing, compression and exhaust operation.

In the situation of illustrative example, be formed with a plurality of compression chambers 15, when compression chamber 15 from the outer circumferential side of the fixed scroll body 12 and the motion vortex body 13 that detours when move at their center, the volume of this compression chamber 15 reduces, refrigeration agent sucks from the intakeport 17 that is arranged on fixed scroll body 12 peripheries, compression chamber 15 refrigeration agent that moves and gradually reduce towards the center, as long as then refrigeration agent is discharged from the relief opening 18 that is formed at fixed scroll body 12 cores. relief opening 18 is provided with the pressure that leaf valve 19. is compressed refrigeration agent and is equal to or greater than predetermined pressure, this leaf valve 19 will be opened with discharging refrigerant, thereby guarantees the exhaust pressure of refrigeration agent.

Whirl type compressor used in the example of freezing air conditioner or freezer conditions, apply back pressure by the pressure that lubricant oil 6 is provided, this lubricant oil is arranged at supply the back pressure cavity 29 of the center back of the motion vortex body 13 that detours, but the present invention is not limited to this. according to the difference of scroll compressor use or operation type, can use other back pressure fluid.

As illustrated in fig. 1 and 2, in order to ensure back pressure, fixed scroll body 12 has scrollwork 12b, the motion vortex body 13 that detours that is positioned at the scrollwork 12b outside has end plate 13a. fixed scroll body 12 and is formed with basic hermetic unit 108 for annular with end plate 13a facing surfaces, be positioned at basic be basic recess 105 and recess 104 outside the hermetic unit 108 of annular for annular, this recess 104 substantially be that the mode of the recess 105 of annular is communicated with the intakeport 17 of fixed scroll body 12 to be independent of. basic is thereby that the hermetic unit 108 of annular stretches out and has outer wall surface 102, this outer wall surface is extended along this inwall 101 from the inner wall surface 101 of scrollwork 12b most peripheral basically. basic end plate 13a sliding contact for the annular hermetic unit 108 and the motion vortex body 13 that detours. more especially, recess 104 forms by mechanical means, perhaps the feed stage casting at fixed scroll body 12 forms, and perhaps forms by casting and machining.

According to said structure, as shown in Figure 1, when scroll compressor carries out air-breathing, compression and exhaust operation, basic is that annular hermetic unit 108 widely forms, inner wall surface 101 from the scrollwork 12b of fixed scroll body 12 outwards keeps the required necessity distances of sealing simultaneously. pressure of inspiration(Pi) imposes on the recess 104. fixed scroll bodies 12 that are communicated with fixed scroll body 12 intakepories 17 usually and applies squeezing action power to the part of the end plate 13a of the motion vortex body 13 that detours, this part owing to pressure of inspiration(Pi) and execute between the back pressure pressure difference and with recess 104 relative contacts.

Result as above-mentioned factor, the back pressure pressure of motion vortex body 13 of detouring increases, even and scroll compressor is when moving than low compression ratio, also might limit or suppress the flop phenomenon of this motion vortex body 13 that detours. and, owing to formed recess 104, therefore can reduce the slide area of propeller and guarantee required hermetic unit 108 simultaneously, and skimming wear also can reduce for annular.

Though recess 14 has the shape of relative complex in this embodiment,, can expect too to obtain identical effect even recess 104 has than the rectilinear form that is easier to make.

Communication passage 10 is arranged in the fixed scroll body 12. and communication passage 10 connects the back pressure side and the low voltage side of compression chamber 15. and communication passage 10 part therebetween is provided with backpressure adjusting mechanism 9. when the back pressure side pressure surpasses predetermined intermediate pressure, this backpressure adjusting mechanism 9 just discharges the back pressure fluid towards low voltage side. and communication passage 10 is opened on the basic back pressure side in the recess 105 of annular that is. by this structure, it is that annular recess 105 is communicated with the back pressure side substantially that communication passage 10 is always passed through. therefore, the backpressure regulation operation that backpressure adjusting mechanism 9 is carried out just can not be interrupted, and as long as the pressure of back pressure fluid surpasses predetermined value, will discharge the back pressure fluid towards the low voltage side of compression chamber 15. therefore, when the back pressure fluid is oily 6 the time, this oil 6 can lubricate and seal compression chamber 15 lubricating detail on every side effectively, and the performance of scroll compressor can be improved and stabilization.

This embodiment's scroll compressor is an example of so-called sealing scroll compressor, though this sealing scroll compressor is connected on the refrigerating circulatory device and is arranged in the container 1. this scroll compressor mainly uses in non-maintaining mode. and illustrated this compressor is vertically arranged, in some cases also might lateral arrangement.

As shown in Figure 3, scroll compressor is arranged on the top of container 1 and fixes by main bearing element 11, this main bearing element 11 is supporting arbor 4 upwardly extending ends. this main bearing element 11 by shrinkage fit or welded and installed on the inner circumference of container 1, and fixed scroll body 12 is fixed by bolts on this main bearing. the motion vortex body 13 that detours be clipped between main bearing 11 and the fixed scroll body 12 and with 12 engagements of fixed scroll body, compression chamber 15 is formed at and detours between motion vortex body 13 and the fixed scroll body 12. be arranged on as the partition ring of rotation condition mechanism 14 and detour between motion vortex body 13 and the main bearing element 11. will the detour rotation of motion vortex body 13 of rotation condition mechanism 14 is limited between main bearing element 11 and the rotation condition mechanism 14. element that other is known or mechanism also can be used as rotation condition mechanism 14.

Motor 3 is arranged in the container 1 in addition to drive scroll compressor. and motor 3 comprises stator 3a and rotor 3b, this stator is by shrinkage fit or be weldingly fixed on the inner circumference of container 1, this rotor is positioned at stator 3a inside. and rotor 3b is fixed on the arbor 4. and the other end that is fixed on rotor 3b arbor 4 parts last and that extend is downwards rotatably received by auxiliary bearing element 21, and this auxiliary bearing element 21 is fixed by welding on the inner circumference of container 1.

4a is fitted in the motion vortex body 13 that detours if arbor 4 is provided with this eccentric shaft portion of eccentric shaft portion 4a. in the top. and arbor 4 is by motor 3 rotary driving, thereby then this arbor 4 and rotation condition mechanism 14 play a role jointly along the predetermined circular orbit rotation motion vortex body 13. that detours

Arbor 4 the other end down is provided with pump 25. these pumps 25 and is driven simultaneously with scroll compressor. in this way, pump 25 will be arranged at the oil 6 upwards pumpings in the oil cup 20 of container 1 lower end, thereby oil 6 is supplied with the exhaust pressure that back pressure cavity 29. supply pressure at this moment almost equals scroll compressor by the oily supply orifice 26 that vertically passes arbor 4, and equally play the effect in back pressure source with respect to the periphery of the motion vortex body 13 that detours. in this way, the motion vortex body 13 that detours can not separate or even can not be compressed upset from fixed scroll body 12, and the motion vortex body 13 that detours can stably be implemented the compression function be scheduled to.

A part of supplying with the oil 6 of back pressure cavity 29 enters eccentric shaft portion 4a, the assembled portion of motion vortex body 13 and the bearing 66 between arbor 4 and the main bearing element 11 detour, and should oil 6 lubricated these parts drip and return oil cup 20 then, thereby make oil 6 seek one and to escape the space because of supply pressure or himself gravity. another part of supplying with the oil 6 of back pressure cavity 29 passes path 54, and shunting enters the fixed scroll body 12 of engagement and the sliding parts between the motion vortex body 13 of detouring, and the annular space 8 that is provided with motion vortex body 13 peripherals that detour of rotation condition mechanism 14, this oil 6 lubricates sliding partss of engagement sliding partss and rotation condition mechanism 14, and applies the back pressure of the motion vortex body 13 that detours in annular space 8.

When oil 6 enters annular space 8, the diameter that reduces part 57 by diameter reduces function, the pressure of this oil 6 is configured to the intermediate pressure between back pressure and the compression chamber 15 mesolow side pressure. and the space between back pressure cavity 29 high pressure sides and the annular space 8 is by 78 sealings of annular and separation band. because entering of oil is full of, its pressure rises, if and pressure surpasses predetermined value, then backpressure adjusting mechanism 9 actions and oil 6 are returned the low voltage side of compression chamber 15 and enter wherein. and this oily 6 the operation that enters repeats with predetermined circulation, and the time selection of this repetition is by air-breathing, the combination of compression and exhaust operation repetitive cycling, and the relation between the pressure that pressure falls and backpressure adjusting mechanism 9 is set of diameter minimizing part 57 settings is determined, thereby the engagement sliding parts of having a mind to allow fixed scroll body 12 and detouring between the motion vortex body 13 is lubricated. by opening communication passage 10 towards basic recess 105 in a manner described for annular, this have a mind to lubricated can be guaranteed always. and the oil 6 of supply intakeport 17 has been avoided the leakage between the compression chamber 15 like this along with the rotation of the motion vortex body 13 that detours moves into compression chamber 15.

Refrigerant gas 27 shown in the dotted line is equally mobile from the refrigeration agent image pattern 3 that compressing mechanism 2 is discharged. and refrigeration agent enters in the baffler 77 that is fixed by bolts on the compressing mechanism 2, flow to the below of compressing mechanism 2 then by compressing mechanism communication passage 32, when rotating, the rotor 3b of motor 3 arrives position below motor 3 then by this rotor, and oil 6 is shaken to cause drop by centrifugation, again oil 6 is returned in the oil cup 20. with the position of oil 6 refrigeration agents that separate by stator 3a arrival motor 3 tops of motor 3, arrive the position of baffler 77 tops then by another compressing mechanism communication passage 43, discharge from the outer relief opening 39 of container 1 at last and offer refrigeration cycle. return the sucking pipe 16 of container 1 by the refrigeration agent of refrigeration cycle, and be drawn into the compression chamber 15 from intakeport 17, repeat these operations thereafter again.

(second embodiment)

To use Fig. 1 and 2 to set forth the scroll compressor of second embodiment of the invention below.

Scroll compressor according to this embodiment, the scrollwork 12b of fixed scroll body 12 twines the winding terminal area that terminal extends to the scrollwork 13b of the motion vortex body 13 that detours from it, and the inner wall surface of scrollwork 12b extension is made curve 106, and the scrollwork 12b of this curve and fixed scroll body 12 is continuous.

In the situation of this embodiment's scroll compressor, this extension can be used as the passage of suction stroke or be used as the part of compression stroke. in the back in the example of this situation, near the continous curve 106 and gap in the winding terminal of the scrollwork 13b of the motion vortex body 13 that detours is configured to very little value, and scroll compressor can operation when the capacity of compression chamber 15 changes in pseudo-mode according to the motion speed of this scroll compressor.

In this case, the method of operation of scroll compressor is, the capacity that holds of two compression chambers 15 differs from one another, when suction stroke finishes, the capacity that holds of the compression chamber 15 that holds capacity and centered on by the scrollwork 13b inner wall surface of the motion vortex body 13 that detours of the compression chamber 15 that is centered on by the scrollwork 12b inner wall surface 101 of fixed scroll body 12 differs from one another. just, the compression chamber 15 that centers on by the scrollwork 12b inner wall surface 101 of fixed scroll body 12 to hold capacity bigger. in this case, carrying out along with compression stroke, will between the pressure of two compression chambers 15, produce uneven, attempt the turning torque of motion vortex body 13 from 12 separation of fixed scroll body that detour thereby produce, the result just exists in the unfavorable possibility that motion vortex body 13 flop phenomenon that detour under the low pressure compression operating conditions are accelerated.

Yet, the same with first embodiment, same in second embodiment's scroll compressor, thereby can suppress flop phenomenon owing to supply with the back pressure increase of the motion vortex body 13 that detours, therefore make that moving this scroll compressor when the capacity of compression chamber 15 changes in pseudo-mode according to motion speed becomes possibility, and might obtain a kind of scroll compressor efficiently.

When identical with the curve of the continuous curve of the scrollwork 12b of fixed scroll body 12 and the scrollwork 12b that forms fixed scroll body 12, scroll compressor will run on a kind of like this state, promptly no matter motion speed how the capacity that holds of two compression chambers 15 always differ from one another. therefore always between compression chamber 15, produce pressure imbalance, and the flop phenomenon of the motion vortex body 13 that further quickens to detour.

Yet, scroll compressor according to this embodiment, because the low cruise very little from the back pressure pressure that imposes on the motion vortex body 13 that detours begins just can stably suppress flop phenomenon period, therefore scroll compressor can run on a kind of like this state, promptly the capacity that holds of two compression chambers 15 always differs from one another, the compression wearing and tearing of air-breathing part can be suppressed to minimum value, and can obtain high efficiency.

(the 3rd embodiment)

To set forth the scroll compressor of third embodiment of the invention below. Fig. 4 is the planimetric map of fixed scroll body, and this fixed scroll body is the major component of the scroll compressor of third embodiment of the invention.

As shown in Figure 4, scroll compressor according to this embodiment, basic hermetic unit 108 for annular is provided with stria 107, this stria extends near the position the winding terminal of scrollwork 13b of the motion vortex body 13 that detours and is communicated with recess 104, this recess is communicated with intakeport 17. and just pressure of inspiration(Pi) is supplied to stria 107, and this pressure of inspiration(Pi) enters from basic most of angular range for annular hermetic unit 108.

Therefore, scroll compressor according to this embodiment, pressure of inspiration(Pi) can be imposed on the major part of the end plate 13a of the motion vortex body 13 that detours, back pressure institute applied pressure does not increase in the part angular regions, but back pressure institute applied pressure can increase in most of angular range. the flop phenomenon of the motion vortex body 13 that therefore can suppress more effectively to detour.

When the scrollwork 12b of fixed scroll body 12 extends to scrollwork 13b near the motion vortex body 13 that detours and twines the position of terminal, basic seal length for annular hermetic unit 108 is shortened, and the shape of the recess 104 that is communicated with intakeport 17 is restricted dimensionally. in this case, if form two recesses 104 and two strias 107 and they communicated with each other, then can avoid this structural restriction.

As this embodiment's object lesson, recess 104 can form by casting in the raw material stage of fixed scroll body 12 in advance, and can carry out machining so that it is communicated with casting recess 104 to stria 107.

Select as another kind, fixed scroll body just as another embodiment's shown in Figure 5 scroll compressor, stria 107 can form with recess 104 integral body basically. in this situation, they can form by mechanical means, perhaps all form by casting in the raw material stage, perhaps all passing through casting and machining forms. in either case, can obtain the effect identical with the 3rd embodiment.

(the 4th embodiment)

To use Fig. 4 to set forth the scroll compressor of fourth embodiment of the invention below.

In the 4th embodiment's shown in Figure 4 scroll compressor, substantially be in the hermetic unit 108 of annular, if the seal length between seal length between recess 104 inner wall surface and fixed scroll body 12 inner wall surface 101 or stria 107 and fixed scroll body 12 internal surfaces 101 is defined as " S ", if and the thickness of the scrollwork of fixed scroll body 12 is defined as " t ", then can set up the relation of t/4<S<3t.

Just, the scrollwork thickness of fixed scroll body 12 is " t ", and the seal length between the compression chamber 15 is enough, but substantially be that rising is so not many for pressure in the compression chamber 15 in the hermetic unit 108 of annular, seal required pressure difference and may be lower than pressure in the compression chamber 15. confirm by experiment, during seal length more than having t/4, can leak suppressing to a value that does not exert an influence of recess 104 or stria 107 will be entered, yet pressure of inspiration(Pi) puts on this recess or the stria from compression chamber 15., when the surface accuracy of hermetic unit is relatively poor, for example, when the surface accuracy of the motion vortex body 13 end plate 13a that detour was relatively poor, then needing to make seal length was more than the t/4.

In order to ensure exerting pressure of sealability and raising back pressure, preferably sealed length is below the 3t. therefore, if the seal length of the basic hermetic unit 108 for annular of fixed scroll body 12 be arranged on t/4 above with below the 3t between scope in, then can guarantee required minimum seal length, and the recess that is connected or stria can be arranged on maximum value.

As mentioned above,,, might suppress from the leakage of compression chamber 15 by limiting the seal length of basic hermetic unit 108 for annular according to this embodiment's scroll compressor, and the flop phenomenon of the motion vortex body 13 that might suppress effectively to detour.

When considering the pressure rising degree of compression chamber 15, reduce gradually owing to sealing the winding terminal of required pressure difference towards the scrollwork 13b of the motion vortex body 13 that detours, therefore in this embodiment's scroll compressor, if to the seal length between recess 104 inner wall surface and fixed scroll body 12 inner wall surface 101, perhaps the seal length between stria 107 and fixed scroll body 12 inner wall surface 101 is provided with, its winding terminal towards the scrollwork 13b of the motion vortex body 13 that detours is reduced gradually, then can further improve above-mentioned effect.

(the 5th embodiment)

To use Fig. 1 and 2 to set forth the scroll compressor of fifth embodiment of the invention below.

In the 5th embodiment's scroll compressor, when the scrollwork height (being the scrollwork groove depth) of fixed scroll body 12 when being defined as Hmm, the degree of depth 104h of the recess 104 that is communicated with fixed scroll body 12 intakepories 17 is more than the 0.1mm and below the H/3mm.

Just, if degree of depth 104h is more than the 0.1mm, if then might prevent the viscosity loss that produced of back pressure fluid on the oil 6 or motion vortex body 13 slidingsurfaces that similarly detour. degree of depth 104h is restricted to below the H/3mm, then might avoids worsening the problem that the running precision that produces descends by the intensity of the scrollwork 12b of fixed scroll body 12 or rigidity.

According to this embodiment's scroll compressor, the slide area of propeller can obtain restriction, and viscosity loss also can be minimum, and might suppress to be worsened by the scrollwork 12b operating accuracy of fixed scroll body 12 increase of the compression loss that produces.

Same in this embodiment's shown in Figure 4 scroll compressor, when the scrollwork height (being the scrollwork groove depth) of fixed scroll body 12 when being defined as 112h, preferably the degree of depth 104h of the recess 104 that is communicated with fixed scroll body 12 intakepories 17 is more than the 0.1mm and below the H/3mm. in this case, when the scrollwork height (being the scrollwork groove depth) of fixed scroll body 12 when being defined as Hmm, it is above and below the H/3mm that preferably the degree of depth of stria 107 is similarly 0.1mm.

In this embodiment's scroll compressor, by the degree of depth of stria 107 being arranged to the degree of depth less than the recess 104 that is communicated with fixed scroll body 12 intakepories 17, when processing stria 107, just might reduce the processing resistance, do not need to reduce processing speed and prevent that instrument is impaired, and the speed of processing and production can be improved.

(the 6th embodiment)

The scroll compressor of sixth embodiment of the invention is the scroll compressor (not shown) among first to the 5th arbitrary embodiment, this scroll compressor is with less than the operation of the compression ratio of design compression ratio, and this design compression ratio is determined by the scrollwork 12b of the fixed scroll body 12 and the motion vortex body 13 that detours and 13b and similar aspect.

Whirl type compressor used in the situation of family expenses freezing air conditioner or analog, the compression ratio that has high operation frequency in many cases is approximately 1.5 to 4.0. in the situation of motion speed various type scroll compressor, the design compression ratio of being determined by scrollwork 12b and 13b and analog approximately is arranged to 1.8 to 3.0. commercial style air conditioners and is not fallen in these scopes in many cases, if and its design compression ratio will be provided with greatlyyer in some cases. attempt in the flop phenomenon that is approximately the motion vortex body 13 that suppresses under 1.5 to 2.0 the operation compression ratio to detour, just need to increase the back pressure of the motion vortex body 13 that detours. the very big back pressure that under this set, skimming wear can be because the high pressure ratio zone in many cases (about 2.5 or bigger compression ratio) and increasing.

Even the scroll compressor among first to the 5th arbitrary embodiment is with the compression ratio operation less than design compression ratio, this design compression ratio is by scrollwork 12a and the 13a and the similar aspect definite (being approximately 1.8 to 3.0 Whirl type compressor used in the situation of family expenses freezing air conditioner) of the fixed scroll body 12 and the motion vortex body 13 that detours, the flop phenomenon of motion vortex body 13 also might suppress to detour, and can improve the efficient of scroll compressor in the higher compression ratio zone of operation frequency, and even the scroll compressor that occurs recently in many cases with high-efficiency freezing air conditioner than the low compression ratio operation in, its efficient can also further improve.

(the 7th embodiment)

The scroll compressor of seventh embodiment of the invention use high-pressure refrigerant for example carbon dioxide as the refrigeration agent (not shown). the advantage of this embodiment's scroll compressor is that it might prevent the increase of skimming wear, thereby even and the back pressure of the motion vortex body 13 that detours excessively increase and make the skimming wear that advances the slide part office also be tending towards increasing, can use environment amenable carbon dioxide as refrigeration agent too.

In using the heat pump water heating system of carbon dioxide as refrigeration agent, scroll compressor since its characteristic with extremely low compression ratio (about 1.5 or littler) even operation. under this service condition, also might obtain scroll compressor efficiently.

According to scroll compressor of the present invention, might be in the compressibility and the circulating load of the raising refrigeration agent in service of low compression ratio, and, also might improve the efficient and the reliability of freezing air conditioner in the raising mechanical efficiency in service of high compression ratio.

The industry utilizability

As mentioned above, according to scroll compressor of the present invention, might be in the raising compression efficiency in service of low compression ratio, and might be in the raising mechanical efficiency in service of high compression ratio, also might expect those new alternative refrigerants, new refrigerant, natural refrigerant and will can be used in the scroll compressor at the similar cold-producing medium that use future.

Claims (11)

1. scroll compressor, the fixed scroll body that wherein has scrollwork is engaged with each other with the motion vortex body that detours with end plate and scrollwork, thereby make the scrollwork of vortex body enter inside, the described motion vortex body that detours rotates with the state that this rotation of detouring the motion vortex body is prevented from, propelling force when the motion vortex body that detours rotates is supported by the slidingsurface between described end plate and the described fixed scroll body, back pressure pressure support by imposing on the described motion vortex body back side of detouring is characterized in that
The described fixed scroll surface relative with the described end plate of the described motion vortex body that detours in the described fixed scroll body scrollwork outside is formed with: basic hermetic unit for annular, sealing partly extends into has outer wall surface, this outer wall surface stretches out along this inner wall surface from the inner wall surface of the most peripheral of the described scrollwork of described fixed scroll body, and the described end plate sliding contact of sealing part and the described motion vortex body that detours; Be positioned at the basic basic recess outside the hermetic unit of annular that is for annular; And substantially be the recess that the mode of the recess of annular is communicated with the intakeport of described fixed scroll body to be independent of described.
2. scroll compressor according to claim 1, the described scrollwork that it is characterized in that described fixed scroll body is formed by curve, this curve extends to position near the winding terminal of the described scrollwork of the described motion vortex body that detours from the winding terminal of the described scrollwork of described fixed scroll body, and the described scrollwork of the inner wall surface of the extension of described curve and described fixed scroll body is continuous.
3. scroll compressor according to claim 2 is characterized in that identical with the curve of the described scrollwork that forms described fixed scroll body with the continuous described curve of the described scrollwork of described fixed scroll body.
4. scroll compressor according to claim 1, it is characterized in that described basic hermetic unit for annular is provided with stria, this stria extends to the position near the winding terminal of the described scrollwork of the described motion vortex body that detours, and this stria is communicated with described recess.
5. scroll compressor according to claim 1, it is characterized in that when the scrollwork thickness of described fixed scroll body is defined as " t ", seal length between the inner wall surface of inner wall surface that is in described recess substantially for annular hermetic unit and described fixed scroll body, the seal length between the inner wall surface of perhaps described stria and described fixed scroll body are that t/4 is above with below the 3t.
6. scroll compressor according to claim 5, it is characterized in that the seal length between the inner wall surface of the inner wall surface of described recess and described fixed scroll body, the seal length between the inner wall surface of perhaps described stria and described fixed scroll body reduces gradually towards the winding terminal of the described scrollwork of the described motion vortex body that detours.
7. scroll compressor according to claim 4 is characterized in that when the scrollwork height of described fixed scroll body is defined as Hmm, and the degree of depth of described recess or described stria is that 0.1mm is above with below the H/3mm.
8. scroll compressor according to claim 4, the degree of depth that it is characterized in that described stria is less than described concave depth.
9. scroll compressor according to claim 1 is characterized in that described scroll compressor with the compression ratio operation less than design compression ratio, and this design compression ratio is determined by the scrollwork of the described fixed scroll body and the motion vortex body that detours.
10. according to each described scroll compressor of claim 1 to 9, it is characterized in that high-pressure refrigerant is used as refrigeration agent.
11., it is characterized in that carbon dioxide is used as refrigeration agent according to each described scroll compressor of claim 1 to 9.
CNB2004800066427A 2003-10-17 2004-10-14 Scroll compressor CN100396930C (en)

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JP357706/2003 2003-10-17
JP39421/2004 2004-02-17

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Publication number Priority date Publication date Assignee Title
JP5199951B2 (en) * 2009-06-01 2013-05-15 日立アプライアンス株式会社 Scroll compressor
CN105782030B (en) * 2014-12-22 2018-04-20 珠海格力节能环保制冷技术研究中心有限公司 A kind of screw compressor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06137281A (en) * 1992-10-26 1994-05-17 Hitachi Ltd Scroll compressor
US5791887A (en) * 1996-10-17 1998-08-11 Scroll Technologies Scroll element having a relieved thrust surface
JP2001153068A (en) * 1999-11-30 2001-06-05 Matsushita Electric Ind Co Ltd Scroll compressor
JP2001355584A (en) * 2000-06-15 2001-12-26 Matsushita Electric Ind Co Ltd Scroll compressor
CN1373299A (en) * 2001-02-28 2002-10-09 富士通将军股份有限公司 Vortex compressor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06137281A (en) * 1992-10-26 1994-05-17 Hitachi Ltd Scroll compressor
US5791887A (en) * 1996-10-17 1998-08-11 Scroll Technologies Scroll element having a relieved thrust surface
JP2001153068A (en) * 1999-11-30 2001-06-05 Matsushita Electric Ind Co Ltd Scroll compressor
JP2001355584A (en) * 2000-06-15 2001-12-26 Matsushita Electric Ind Co Ltd Scroll compressor
CN1373299A (en) * 2001-02-28 2002-10-09 富士通将军股份有限公司 Vortex compressor

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