CN105332911A - Scroll compressor - Google Patents
Scroll compressor Download PDFInfo
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- CN105332911A CN105332911A CN201410384217.7A CN201410384217A CN105332911A CN 105332911 A CN105332911 A CN 105332911A CN 201410384217 A CN201410384217 A CN 201410384217A CN 105332911 A CN105332911 A CN 105332911A
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Abstract
The invention provides a scroll compressor. The scroll compressor comprises an upper support, a static scroll plate, a movable scroll plate and a flexible thrusting piece. The upper support comprises an outer ring table, an inner ring table and a containing groove. The static scroll plate is arranged on the outer ring table. The movable scroll plate is arranged between the upper support and the static scroll plate and provided with an end plate. A first sealing piece is arranged between the end plate and the inner ring table. The space between the back face of the movable scroll plate and the upper support is divided into a first back pressure cavity and a second back pressure cavity through the first sealing piece. The pressure of the first back pressure cavity is higher than that of the second back pressure cavity. The flexible thrusting piece is movably arranged in the containing groove in the axial direction and is provided with limiting portions and thrusting portions. The upper end faces of the limiting portions are matched with the static scroll plate. The upper end faces of the thrusting portions are lower than the upper end faces of the limiting portions. Second sealing pieces are arranged between the flexible thrusting piece and the containing groove. A third back pressure cavity is formed between the flexible thrusting piece and the containing groove through the second sealing pieces. The third back pressure cavity is communicated with the first back pressure cavity through a communication hole. The airtightness of the scroll compressor can be improved through the scroll compressor.
Description
Technical field
The present invention relates to compressor field, in particular to a kind of scroll compressor.
Background technique
In the scroll compressor of hyperbaric chamber structure; for ensureing the sealing of compression chamber; usual meeting introduces the exhaust pressure higher than pressure of inspiration(Pi) or intermediate pressure (i.e. counterpressure) at the back side of orbiter, makes together with orbiter fits tightly with fixed scroll.But compressor operating than under operating mode, if the contact force between orbiter and fixed scroll is too large, easily makes scroll be engaged in higher pressure, increases the weight of wearing and tearing, and reliability reduces.For this reason, counterpressure should not be too large when designing.But so compressor operating is when low-pressure ratio operating mode, and counterpressure can not compress orbiter, and orbiter is separated with fixed scroll, compression chamber produces and leaks, and performance sharply declines.
Along with the proposition of APF standard, require that compressor all has higher Performance And Reliability in broader operating range.In the prior art, have and propose the movable accessory of employing to provide the power of extra support orbiter, as patent 200510006566.6.But this structure exists some problems, such as sealed member lacks lubricant oil, and long-term running easily makes bad seals, and movable accessory can by the impact of other moving element, and size is difficult to strengthen, and only can provide support power among a small circle.
Summary of the invention
The present invention aims to provide a kind of scroll compressor, to solve prior art mesoscale eddies compressor in the not tight problem of low-pressure ratio operating mode lower seal.
To achieve these goals, according to an aspect of the present invention, provide a kind of scroll compressor, this scroll compressor comprises: upper bracket, and upper bracket comprises outer land and interior land, forms receiving groove between outer land and interior land, fixed scroll, fixed scroll is fixedly installed in outer land, and seals with the upper-end surface of outer land and fit, orbiter, orbiter is arranged between upper bracket and fixed scroll, orbiter has the end plate be arranged in interior land, the first Sealing is provided with, the second back pressure cavity that the compartition between the back side of orbiter and upper bracket is the first back pressure cavity and is positioned at outside the first back pressure cavity by the first Sealing between end plate and interior land, flexible thrust part, flexible thrust part is along in the receiving groove being axially movably arranged between outer land and interior land of scroll compressor, flexible thrust part has limited part and push stopping part, the upper-end surface of limited part coordinates with the lower end surface of fixed scroll, the upper-end surface of push stopping part is lower than the upper-end surface of limited part, the lower end surface of the end plate of orbiter coordinates with the upper-end surface of push stopping part, the second Sealing is provided with between flexible thrust part and receiving groove, second Sealing makes to form the 3rd back pressure cavity between the lower end surface of flexible thrust part and the bottom land of receiving groove, 3rd back pressure cavity is communicated with by intercommunicating pore with between the first back pressure cavity.
Further, the first back pressure cavity communicates with the Exhaust Gas after the compression of scroll compressor.
Further, flexible thrust part also comprises containing part, the upper-end surface of containing part is lower than the upper-end surface of push stopping part, scroll compressor also comprises cross slip-ring, cross slip-ring is arranged on containing part, and under the lower end surface being positioned at the end plate of orbiter, containing part is provided with the keyway coordinated with the key of cross slip-ring.
Further, the lower end surface of flexible thrust part is provided with anti-rotation piece bores, and the bottom land of receiving groove is provided with the hole coordinated with anti-rotation piece bores, and to form anti-rotation space, rotation preventing device is arranged in anti-rotation space, and stops the rotation of flexible thrust part.
Further, flexible thrust part comprises matrix, matrix is annulus, limited part is the first projection be arranged on the perisporium of annulus, push stopping part is the second projection be arranged on the upper-end surface of annulus, the outer side surface of the second projection is concordant with the outer side surface of annulus, and the upper-end surface of the first projection is higher than the upper-end surface of the second projection.
Further, the quantity of the first projection is three, and arranges at equal intervals along the circumference of annulus, and the quantity of the second projection is four, and arranges at equal intervals along the circumference of annulus.
Further, flexible thrust part also comprises containing part, and the upper-end surface of containing part is lower than the upper-end surface of push stopping part, and the part that the upper-end surface of annulus is positioned at the second projection forms containing part.
Further, limited part upper-end surface to push stopping part upper-end surface between distance be greater than the thickness of end plate.
Further, limited part upper-end surface to push stopping part upper-end surface between distance and the span of difference of thickness of end plate be 5 μm to 20 μm.
Further, intercommunicating pore is arranged on upper bracket, and runs through interior land along the radial direction of scroll compressor.
Apply technological scheme of the present invention, scroll compressor comprises upper bracket, fixed scroll, orbiter and flexible thrust part.Upper bracket comprises outer land and interior land, forms receiving groove between outer land and interior land.To hold flexible thrust part.Fixed scroll is fixedly installed in outer land, and seals with the upper-end surface of outer land and fit.Orbiter is arranged between upper bracket and fixed scroll, orbiter has the end plate be arranged in interior land, be provided with the first Sealing between end plate and interior land, the first Sealing will be divided into the first back pressure cavity and be positioned at the second back pressure cavity outside the first back pressure cavity between the back side of orbiter and upper bracket.Counterpressure can be provided for orbiter by the first back pressure cavity and the second back pressure cavity, orbiter can be adjacent to fixed scroll, ensure the sealing of scroll compressor.Flexible thrust part is along in the receiving groove being axially movably arranged between outer land and interior land of scroll compressor, flexible thrust part has limited part and push stopping part, the upper-end surface of limited part coordinates with the lower end surface of fixed scroll, the upper-end surface of push stopping part is lower than the upper-end surface of limited part, the end plate lower end surface of orbiter coordinates with the upper-end surface of push stopping part, the second Sealing is provided with between flexible thrust part and receiving groove, second Sealing makes to form the 3rd back pressure cavity between the lower end surface of flexible thrust part and the bottom land of receiving groove, 3rd back pressure cavity is communicated with by intercommunicating pore with between the first back pressure cavity.Second back pressure cavity and the 3rd back pressure cavity are in the upper and lower sides of flexible thrust part respectively, flexible thrust part can be controlled by regulating the pressure of both sides to move, under low-pressure ratio operating mode, 3rd back pressure cavity can promote flexible thrust part and move, think the support force that orbiter provides extra, to ensure the sealing of scroll compressor.The sealing between orbiter and fixed scroll can be improved by flexible thrust part and the 3rd back pressure cavity under low-pressure ratio operating mode, promote the operating reliability of scroll compressor.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the sectional view of the scroll compressor of embodiments of the invention;
Fig. 2 shows the sectional view of scroll compressor under high pressure ratio operating mode of embodiments of the invention;
Fig. 3 shows the sectional view of scroll compressor under low-pressure ratio operating mode of embodiments of the invention;
Fig. 4 shows the sectional view of scroll compressor under the abnormal high operating mode of Separating force of embodiments of the invention; And
Fig. 5 shows the cross slip-ring of embodiments of the invention and the perspective view of flexible thrust part.
Description of reference numerals: 1, compressor housing; 2, motor stator; 3, rotor; 4, lower support frame; 5, oil pump; 6, bent axle; 6a, eccentric part; 6b, oilhole; 7, bearing; 8, orbiter; 8a, end plate; 9, fixed scroll; 10, the first Sealing; 11, the first back pressure cavity; 12, the second back pressure cavity; 13, the 3rd back pressure cavity; 14, flexible thrust part; 14a, limited part; 14b, push stopping part; 14c, containing part; 14e, anti-rotation piece bores; 14f, keyway; 15, the second Sealing; 16, upper bracket; 16a, outer land; 16b, intercommunicating pore; 16c, interior land; 17, rotation preventing device; 18, cross slip-ring; 18a, key.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
As shown in Fig. 1 to 5, according to embodiments of the invention, scroll compressor comprises upper bracket 16, fixed scroll 9, orbiter 8 and flexible thrust part 14.
Upper bracket 16 comprises outer land 16a and interior land 16c, forms receiving groove between outer land 16a and interior land 16c.To hold flexible thrust part 14.Fixed scroll 9 is fixedly installed on outer land 16a, and seals with the upper-end surface of outer land 16a and fit.
Orbiter 8 is arranged between upper bracket 16 and fixed scroll 9, orbiter 8 has the end plate 8a be arranged on interior land 16c, the first Sealing 10 is provided with between end plate 8a and interior land 16c, compartition between the back side of orbiter 8 and upper bracket 16 is the first back pressure cavity 11 and is positioned at the pressure of the second back pressure cavity 12, first back pressure cavity 11 outside the first back pressure cavity 11 higher than the second back pressure cavity 12 by the first Sealing 10.Counterpressure can be provided for orbiter 8 by the first back pressure cavity 11 and the second back pressure cavity 12, orbiter 8 can be adjacent to fixed scroll 9, ensure the sealing of scroll compressor.
Flexible thrust part 14 is along in the receiving groove being axially movably arranged between outer land 16a and interior land 16c of scroll compressor, flexible thrust part 14 has limited part 14a and push stopping part 14b, the upper-end surface of limited part 14a coordinates with the lower end surface of fixed scroll 9, the upper-end surface of push stopping part 14b is lower than the upper-end surface of limited part 14a, the lower end surface of end plate 8a of orbiter 8 coordinates with the upper-end surface of push stopping part 14b, the second Sealing 15 is provided with between flexible thrust part 14 and receiving groove, second Sealing 15 makes to form the 3rd back pressure cavity 13 between flexible thrust part 14 and receiving groove, be communicated with by intercommunicating pore 16b between 3rd back pressure cavity 13 with the first back pressure cavity 11.Second back pressure cavity 12 and the 3rd back pressure cavity 13 are in the upper and lower sides of flexible thrust part 14 respectively, flexible thrust part 14 can be controlled by regulating the pressure of both sides to move, under low-pressure ratio operating mode, 3rd back pressure cavity 13 can promote flexible thrust part 14 and move, think the support force that orbiter 8 provides extra, to ensure the sealing of scroll compressor.
In the present embodiment, the pressure of the first back pressure cavity 11 is higher than the pressure of the second back pressure cavity 12, and the 3rd back pressure cavity 13 is communicated with the first back pressure cavity 11, so the pressure of the 3rd back pressure cavity 13 is higher than the pressure of the second back pressure cavity 12.
The sealing between orbiter 8 and fixed scroll 9 can be improved by flexible thrust part 14 and the 3rd back pressure cavity 13 under low-pressure ratio operating mode, promote the operating reliability of scroll compressor.
Second Sealing 15 has two, and one of them the second Sealing 15 is positioned at the inner circle wall of flexible thrust part 14, and another second Sealing 15 is positioned at outside the periphery wall of flexible thrust part 14, to be formed at the 3rd back pressure cavity 13 that the second back pressure cavity 12 is isolated.
In the present embodiment, the first back pressure cavity 11 communicates with the Exhaust Gas after the compression of scroll compressor, and the pressure of the first back pressure cavity 11 is the exhaust pressure of scroll compressor.Second back pressure cavity 12 is communicated with the compressor air suction mouth of scroll compressor.Can ensure that pressure in the first back pressure cavity 11 is higher than the pressure in the second back pressure cavity 12 with this.
In order to avoid flexible thrust part 14 and other component interference of scroll compressor, flexible thrust part 14 also comprises containing part 14c, the upper-end surface of containing part 14c is lower than the upper-end surface of push stopping part 14b, to place the cross slip-ring 18 of scroll compressor, cross slip-ring 18 is positioned under the lower end surface of end plate 8a of orbiter 8, containing part 14c is provided with the keyway 14f coordinated with the key 18a of cross slip-ring 18, to avoid interfering with the key 18a of cross slip-ring 18.
In the present embodiment, in order to ensure that flexible thrust part 14 only has axial motion, the lower end surface of flexible thrust part 14 is provided with anti-rotation piece bores 14e, the bottom land of receiving groove is provided with the hole coordinated with anti-rotation piece bores 14e, to form anti-rotation space, rotation preventing device 17 is arranged in anti-rotation space, and stops the rotation of flexible thrust part 14.
In the present embodiment, flexible thrust part 14 comprises matrix, matrix is annulus, limited part 14a is the first projection be arranged on the perisporium of annulus, push stopping part 14b is the second projection be arranged on the upper-end surface of annulus, the outer side surface of the second projection is concordant with the outer side surface of annulus, and the upper-end surface of the first projection is higher than the upper-end surface of the second projection.
The quantity of the first projection is three, and arranges at equal intervals along the circumference of annulus, and the quantity of the second projection is four, and arranges at equal intervals along the circumference of annulus.To form even support, ensure uniform force.
The upper-end surface of annulus is positioned at the part formation containing part 14c of the second projection, and keyway 14f is recessed to form downwards by the upper-end surface of annulus.
The upper-end surface of limited part 14a to push stopping part 14b upper-end surface between distance be greater than the thickness of end plate 8a.
The upper-end surface of limited part 14a to push stopping part 14b upper-end surface between distance and the span of difference of thickness of end plate 8a be 5 μm to 20 μm.
Intercommunicating pore 16b is arranged on upper bracket 16, and runs through interior land 16c along the radial direction of scroll compressor.
Scroll compressor also comprise in the compressor housing 1 being formed with certain inner space, the inner space being arranged on compressor housing 1 suck, compression and the pump assembly of discharging cold media air, be arranged on compressor housing 1 inner space in be used for driving the electric machine assembly of orbiter 8 and axle module, in order to support the upper bracket 16 of scroll group and axle module and lower support frame 4, in order to provide the oil feed pump 5 of lubricant oil to moving element.Pump assembly mainly comprises fixed scroll 9, orbiter 8, cross slip-ring 18 and flexible thrust part 14.Fixed scroll 9 and orbiter 8 form compression chamber, and cross slip-ring 18 prevents orbiter 8 rotation, and flexible thrust part 14 supports orbiter 8.
The top of compressor housing 1 arranges upper bracket 16, and places fixed scroll 9 on the outer land 16a of upper bracket 16.Fixed scroll 9 has the end face and vortex shape tooth that coordinate with outer land 16a, and the upper-end surface close contact of the outer land 16a of the end face coordinated with outer land 16a and upper bracket 16 also keeps sealing state.Orbiter 8 is provided with between upper bracket 16 and fixed scroll 9.The vortex shape tooth that orbiter 8 has end plate 8a and can engage with the vortex shape tooth of fixed scroll 9 to form compression chamber.Formation two spaces are isolated by the first Sealing 10, the first back pressure cavity 11 that namely pressure is higher and lower the second back pressure cavity 12 of pressure between the lower end surface of the end plate 8a of orbiter 8 and upper bracket 16.
Between upper bracket 16 and fixed scroll 9, be provided with the flexible thrust part 14 that can move axially.Flexible thrust part 14 has the limited part 14a coordinated with the lower end surface of fixed scroll 9, and the push stopping part 14b relative with the lower end surface of the end plate 8a of orbiter 8, also there is the containing part 14c that can place the cross slip-ring 18 preventing orbiter 8 rotation simultaneously, and the keyway 14f coordinated with the pair of keys 18a of cross slip-ring 18.
Preferably, for ensureing flexible thrust part 14 only motion vertically and not rotating, having anti-rotation piece bores 14e in the bottom surface of flexible thrust part 14, and being connected with upper bracket 16 by rotation preventing device 17.Wherein, anti-rotation piece bores 14e is pin-and-hole, and rotation preventing device 17 is pin.
It should be noted that, rotation preventing device 17 is not limited to pin, and bond structure or other suitable mode also can be adopted to limit the rotation of flexible thrust part 14.
The 3rd back pressure cavity the 13, three back pressure cavity 13 is formed by the second Sealing 15 and the second back pressure cavity 12 is isolated between the cell wall of the receiving groove of the bottom of flexible thrust part 14 and upper bracket 16.Be communicated with by intercommunicating pore 16b between 3rd back pressure cavity 13 with the first back pressure cavity 11.
The middle part of compressor housing 1 is provided with motor stator 2, and has been pressed into the rotor 3 of bent axle 6.The upper end of bent axle 6 is eccentric part 6a, and eccentric part 6a is assemblied in the bearing 7 of the afterbody of orbiter 8.
The bottom of compressor housing 1 is provided with lower support frame 4, and lower support frame 4 swings in order to limit bent axle 6.Lower support frame 4 bottom is equipped with oil pump 5.Oil pump 5 upwards provides lubricant oil via the center oilhole 6b of bent axle 6, and lubricant oil enters the first back pressure cavity 11 along the gap between eccentric part 6a and bearing 7 after arriving oilhole 6b top.Then, sub-fraction lubricant oil can enter the second back pressure cavity 12 through the first Sealing 10, and finally enters compression chamber, plays the effect of lubrication and sealing scroll.Major part lubricant oil is got back to bottom compressor along compressor housing 1 inwall after flowing downward and lubricating other axle system moving element.
During scroll compressor running, motor driven crankshafts 6 rotates, and bent axle 6 drives orbiter 8 to move.Under the restriction of cross slip-ring 18, orbiter 8 does translational motion around the axle center of bent axle 6 with fixing radius, thus between orbiter 8 and the scroll wrap of fixed scroll 9, produce several mutually isolated and volume continually varying compression chamber.Compression chamber will be discharged to the inner space of compressor housing 1 after the refrigerant compression of suction.Because refrigeration agent is compressed at compression chamber, pressure raises, and certainly will produce the power that orbiter 8 is separated with fixed scroll 9.This power can make orbiter 8 away from fixed scroll 9, thus causes generation between each compression chamber leak and cause compressor performance to decline.
In order to limit this separation, introducing the counterpressure of middle pressure higher than pressure of inspiration(Pi) in the lower end surface of the end plate 8a of orbiter 8, relying on counterpressure by orbiter 8 by being pressed on fixed scroll 9.
In the present embodiment, form the first back pressure cavity 11, second back pressure cavity 12 and the 3rd back pressure cavity 13: the first back pressure cavity 11 by the first Sealing 10 and the second Sealing 15 and communicate with the Exhaust Gas after compression, pressure is roughly in exhaust pressure Pd level; Second back pressure cavity 12 communicates with suction gas, and pressure is roughly in pressure of inspiration(Pi) Ps level: be communicated with by intercommunicating pore 16b between the 3rd back pressure cavity 13 with the first back pressure cavity 11, and thus the pressure of the 3rd back pressure cavity 13 is also in exhaust pressure Pd level.
It should be noted that, first back pressure cavity 11, second back pressure cavity 12 also can have other to be communicated with form with the 3rd back pressure cavity 13, as the first back pressure cavity 11 communicates with Exhaust Gas, second back pressure cavity 12 is communicated with compression chamber, make its pressure be between pressure of inspiration(Pi) and exhaust pressure, the 3rd back pressure cavity 13 communicates with the first back pressure cavity 11.
If the Separating force size that compression chamber produces is Fa, the area of contour of orbiter 8 in plane perpendicular to axial direction is a, and the area of the circle that the first Sealing 10 surrounds is b, and the annulus area between two the second Sealings 15 is c.
Then can obtain counterpressure Fb=Ps × (a-b)+Pd × b that the fluid in the first back pressure cavity 11, second back pressure cavity 12 produces orbiter 8.
Power Fc=(Pd-Ps) × c upwards that fluid produces flexible thrust part 14.
In conjunction with see Fig. 2, when scroll compressor operates under the higher operating mode of exhaust, pressure of inspiration(Pi), because being in high pressure ratio operating mode, (high pressure ratio operating mode is that exhaust pressure is greater than 2 with pressure of inspiration(Pi) ratio), now Fb>Fa.Orbiter 8 relies on together with counterpressure fits tightly with fixed scroll 9.
Flexible thrust part 14 moves up distance H1 (distance H1 can be 20 μm to 120 μm) under the effect of power Fc, and now limited part 14a contacts with the lower end surface of fixed scroll 9.Because the distance of, limited part 14a to push stopping part 14b is than large about 5-20 μm of the end plate 8a thickness of orbiter 8, so there is less gap h1 in the lower end surface of the end plate 8a of push stopping part 14b and orbiter 8.Therefore, now can seal very well between each compression chamber, and pressing force between orbiter 8 and fixed scroll 9 is less, is only:
F＝Fb-Fa＝Ps×(a-b)+Pd×b-Fa。
In conjunction with see Fig. 3, when scroll compressor operates under the lower operating mode of exhaust, pressure of inspiration(Pi), owing to being in low-pressure ratio operating mode, (low-pressure ratio operating mode is that exhaust pressure is greater than 1.2 with pressure of inspiration(Pi) ratio and is less than 2), now Fb<Fa.Orbiter 8 separates with fixed scroll 9 under the effect of Separating force Fa, and the lower end surface of the end plate 8a of orbiter 8 contacts with the push stopping part 14b of flexible thrust part 14, and flexible thrust part 14 provides additional power Fc to orbiter 8.Now, fluid power Fc>Fa-Fb that flexible thrust part 14 is produced.
Therefore, flexible thrust part 14 still can move up distance H2 under the effect of Fc, and limited part 14a contacts with the lower end surface of fixed scroll 9.But now, there is less gap h2 between the lower end surface of fixed scroll 9 and the end plate 8a of orbiter 8.Now there is certain leakage between each compression chamber, but due to h2 very little, h2 can be made to control 5-10 μm of such level when processing conditions meets, therefore leak and greatly reduce, compressor performance still keeps higher level.
In conjunction with see Fig. 4, time when scroll compressor operates in that Separating force is abnormal to be raised, when scroll compressor exists impurity or sucks excess liq, Separating force Fa can sharply rise, now Fa>Fb+Fc.
Orbiter 8 separates with fixed scroll 9 under the effect of Separating force, and the lower end surface of the end plate 8a of orbiter 8 contacts with the push stopping part 14b of flexible thrust part 14.Because Separating force is excessive, flexible thrust part 14 can move downward distance H3 and fall back on upper bracket 16, and limited part 14a is separated with fixed scroll end face 9a.Now, there is larger gap between the end face of fixed scroll 9 and the end plate 8a of orbiter 8 is H3+h3, produces serious leak, and then Separating force is reduced between each compression chamber, avoids too high Separating force to cause the damage of compressor components.
The limited part 14a of flexible thrust part 14 is made up of several pillar-shaped first projection being distributed in outside, and the end face of the first projection can contact with the lower end surface of fixed scroll 9.The distance of limited part 14a to push stopping part 14b is slightly larger than the end plate 8a thickness of orbiter 8.
Flexible thrust part 14 in radial directions, inner side has the containing part 14c placing the cross slip-ring 18 and keyway 14f coordinated with the pair of keys 18a of cross slip-ring 18, in the second projection that the outside dispersed placement 2 or multiple of this containing part 14c extends vertically, this second projection is relative with the lower end surface of the end plate 8a of orbiter 8, to form push stopping part 14b.Limited part 14a is positioned at radial direction outermost.
Flexible thrust part 14 utilizes the second Sealing 15 to make its side relative with orbiter 8 in the axial direction be in the environment under low pressure of pressure of inspiration(Pi) or intermediate pressure, and the side relative with upper bracket 16 is in and is substantially equal in the hyperbaric environment of exhaust pressure.Under the effect of difference force, flexible thrust part 14 moves to fixed scroll 9 side, and limited part 14a contacts with fixed scroll end face 9a and spacing.
Compressor operating is in higher pressure than under operating mode, and orbiter 8 relies on together with counterpressure fits tightly with fixed scroll 9.The limited part 14a of flexible thrust part 14 contacts with the lower end surface of fixed scroll 9, because the distance of limited part 14a to push stopping part 14b is slightly larger than the thickness of the end plate 8a of orbiter 8, there is less gap in the lower end surface of the end plate 8a of push stopping part 14b and orbiter 8, flexible thrust part 14 can not increase the pressing force that orbiter 8 is subject to.
When low-pressure ratio operating mode, the Separating force between orbiter 8 and fixed scroll 9 is greater than counterpressure, and orbiter 8 is separated with fixed scroll 9.Now, the limited part 14a of flexible thrust part 14 still contacts with the lower end surface of fixed scroll 9, and the push stopping part 14b of flexible thrust part 14 contacts with the lower end surface of the end plate 8a of orbiter 8.Owing to being subject to the restriction of flexible thrust part 14, the gap that orbiter 8 is separated is very little, effectively decreases leakage.
There are the abnormal conditions such as impurity at compression chamber, when the Separating force that compression chamber is produced rises extremely, flexible thrust part 14 moves to upper bracket 16 side, and contact with upper bracket 16, and limited part 14a is separated with the lower end surface of fixed scroll 9, the lower end surface of the end plate 8a of orbiter 8 contacts with the push stopping part 14b of flexible thrust part 14 simultaneously.Now produce comparatively wide arc gap between orbiter 8 and fixed scroll 9, compression chamber internal pressure can be made to decline, thus avoid damage parts.
From above description, can find out, the above embodiments of the present invention achieve following technique effect: scroll compressor of the present invention can improve the sealability of the pump housing under low-pressure ratio operating mode, under ensureing high pressure ratio operating mode, counterpressure is suitable simultaneously, promotes the Performance And Reliability of compressor in the operating range of broadness.In addition because flexible thrust part of the present invention is less by the size restrictions of other moving element, the larger support force that can provide, has widened the scope of compressor reliable operation.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a scroll compressor, is characterized in that, comprising:
Upper bracket (16), described upper bracket (16) comprises outer land (16a) and interior land (16c), forms receiving groove between described outer land (16a) and described interior land (16c);
Fixed scroll (9), described fixed scroll (9) is fixedly installed on described outer land (16a), and seals with the upper-end surface of described outer land (16a) and fit;
Orbiter (8), described orbiter (8) is arranged between described upper bracket (16) and described fixed scroll (9), described orbiter (8) has the end plate (8a) be arranged on described interior land (16c), the first Sealing (10) is provided with between described end plate (8a) and described interior land (16c), compartition between the back side of described orbiter (8) and described upper bracket (16) is the first back pressure cavity (11) and the second back pressure cavity (12) being positioned at described first back pressure cavity (11) outside by described first Sealing (10),
Flexible thrust part (14), described flexible thrust part (14) is along in the receiving groove being axially movably arranged between described outer land (16a) and described interior land (16c) of scroll compressor, described flexible thrust part (14) has limited part (14a) and push stopping part (14b), the upper-end surface of described limited part (14a) coordinates with the lower end surface of described fixed scroll (9), the upper-end surface of described push stopping part (14b) is lower than the upper-end surface of described limited part (14a), the lower end surface of the end plate (8a) of described orbiter (8) coordinates with the upper-end surface of described push stopping part (14b), the second Sealing (15) is provided with between described flexible thrust part (14) and described receiving groove, described second Sealing (15) makes to form the 3rd back pressure cavity (13) between described flexible thrust part (14) and described receiving groove, described 3rd back pressure cavity (13) is communicated with by intercommunicating pore (16b) with between described first back pressure cavity (11).
2. scroll compressor according to claim 1, is characterized in that, described first back pressure cavity (11) communicates with the Exhaust Gas after the compression of scroll compressor.
3. scroll compressor according to claim 1, it is characterized in that, described flexible thrust part (14) also comprises containing part (14c), the upper-end surface of described containing part (14c) is lower than the upper-end surface of described push stopping part (14b), scroll compressor also comprises cross slip-ring (18), described cross slip-ring (18) is arranged on described containing part (14c), and under the lower end surface of end plate (8a) being positioned at described orbiter (8), described containing part (14c) is provided with the keyway (14f) coordinated with the key of described cross slip-ring (18).
4. scroll compressor according to claim 1, it is characterized in that, the lower end surface of described flexible thrust part (14) is provided with anti-rotation piece bores (14e), the bottom land of described receiving groove is provided with the hole coordinated with described anti-rotation piece bores (14e), to form anti-rotation space, rotation preventing device (17) is arranged in described anti-rotation space, and stops the rotation of described flexible thrust part (14).
5. scroll compressor according to claim 1, it is characterized in that, described flexible thrust part (14) comprises matrix, described matrix is annulus, described limited part (14a) is protruding for being arranged on first on the perisporium of described annulus, described push stopping part (14b) is protruding for being arranged on second on the upper-end surface of described annulus, the outer side surface of described second projection is concordant with the outer side surface of described annulus, and the upper-end surface of described first projection is higher than the upper-end surface of described second projection.
6. scroll compressor according to claim 5, is characterized in that, the quantity of described first projection is three, and arranges at equal intervals along the circumference of described annulus, and the quantity of described second projection is four, and arranges at equal intervals along the circumference of described annulus.
7. scroll compressor according to claim 5, it is characterized in that, described flexible thrust part (14) also comprises containing part (14c), the upper-end surface of described containing part (14c) is lower than the upper-end surface of described push stopping part (14b), and the part that the upper-end surface of described annulus is positioned at described second projection forms described containing part (14c).
8. scroll compressor according to claim 1, is characterized in that, the upper-end surface of described limited part (14a) to described push stopping part (14b) upper-end surface between distance be greater than the thickness of described end plate (8a).
9. scroll compressor according to claim 8, it is characterized in that, the upper-end surface of described limited part (14a) to described push stopping part (14b) upper-end surface between distance and the span of difference of thickness of described end plate (8a) be 5 μm to 20 μm.
10. scroll compressor according to claim 1, is characterized in that, described intercommunicating pore (16b) is arranged on described upper bracket (16), and runs through described interior land (16c) along the radial direction of described scroll compressor.
Priority Applications (1)
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| CN106382222A (en) * | 2016-11-28 | 2017-02-08 | 天津商业大学 | Scroll compressor with elastic cross-shaped connection ring |
| CN107575381A (en) * | 2017-09-04 | 2018-01-12 | 珠海格力节能环保制冷技术研究中心有限公司 | Screw compressor and air conditioner |
| CN108350880A (en) * | 2016-09-14 | 2018-07-31 | 日立江森自控空调有限公司 | Screw compressor |
| CN108953143A (en) * | 2018-09-13 | 2018-12-07 | 珠海格力节能环保制冷技术研究中心有限公司 | Screw compressor and air conditioner with it |
| CN110017276A (en) * | 2018-01-08 | 2019-07-16 | 艾默生环境优化技术(苏州)有限公司 | Screw compressor |
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