CN105332911B - Screw compressor - Google Patents
Screw compressor Download PDFInfo
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- CN105332911B CN105332911B CN201410384217.7A CN201410384217A CN105332911B CN 105332911 B CN105332911 B CN 105332911B CN 201410384217 A CN201410384217 A CN 201410384217A CN 105332911 B CN105332911 B CN 105332911B
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- back pressure
- screw compressor
- orbiter
- pressure cavity
- flexible thrust
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Abstract
The present invention provides a kind of screw compressor.The screw compressor includes：Upper bracket, including outer land, interior land and holding tank；Fixed scroll, is arranged in outer land；Orbiter, it is arranged between upper bracket and fixed scroll, with end plate, first seal is provided between end plate and interior land, space between the back side of orbiter and upper bracket is divided into the first back pressure cavity and the second back pressure cavity by first seal, and the pressure of the first back pressure cavity is higher than the second back pressure cavity；And flexible thrust part, it is arranged on axially translatablely in holding tank, with limiting section and push stopping part, the upper surface of limiting section coordinates with fixed scroll, the upper surface of push stopping part is less than the upper surface of limiting section, second seal is provided between flexible thrust part and holding tank, second seal makes to form the 3rd back pressure cavity between flexible thrust part and holding tank, connected between the 3rd back pressure cavity and the first back pressure cavity by intercommunicating pore.The present invention can improve the sealing of screw compressor.
Description
Technical field
The present invention relates to compressor field, in particular to a kind of screw compressor.
Background technology
In the screw compressor of high pressure cavity configuration, to ensure the sealing of compression chamber, it will usually in the back of the body of orbiter
The face introducing pressure at expulsion higher than pressure of inspiration(Pi) or intermediate pressure (i.e. back pressure), are brought into close contact orbiter and fixed scroll
Together.However, compressor operating in higher pressure than under operating mode, if the contact force between orbiter and fixed scroll is too big,
Scroll plate easily is engaged, abrasion, reliability reduction is aggravated.Therefore, back pressure should not be too big in design.But such compressor
When operating in low-pressure ratio operating mode, back pressure can not compress orbiter, and orbiter is separated with fixed scroll, compression chamber
Leakage is produced, performance drastically declines.
With the proposition of APF standards, it is desirable to which compressor possesses higher performance in broader operating range and can
By property.In the prior art, there are the power for proposing that extra support orbiter is provided using movable accessory, such as patent
200510006566.6.But the structure be present, such as seal member lacks lubricating oil, and long-term operating easily makes sealing
Damage, and movable accessory can be influenceed by other moving components, and size is difficult to increase, and is only capable of the offer support of small range
Power.
The content of the invention
The present invention is intended to provide a kind of screw compressor, with solve in the prior art screw compressor under low-pressure ratio operating mode
Poorly sealed the problem of.
To achieve these goals, according to an aspect of the invention, there is provided a kind of screw compressor, the scroll compression
Machine includes：Upper bracket, upper bracket includes outer land and interior land, and holding tank is formed between outer land and interior land；Fixed scroll,
Fixed scroll is fixedly installed in outer land, and with the upper surface palette of outer land；Orbiter, orbiter is arranged on
Between upper bracket and fixed scroll, orbiter has the end plate being arranged in interior land, is provided between end plate and interior land
Space between the back side of orbiter and upper bracket is divided into the first back pressure cavity and is located at by first seal, first seal
The second back pressure cavity on the outside of first back pressure cavity；Flexible thrust part, flexible thrust part is axially movably set along screw compressor
Put in the holding tank between outer land and interior land, flexible thrust part has limiting section and push stopping part, the upper surface of limiting section
Coordinate with the lower surface of fixed scroll, the upper surface of push stopping part is less than the upper surface of limiting section, the lower end of the end plate of orbiter
Face and the upper surface of push stopping part coordinate, and second seal are provided between flexible thrust part and holding tank, second seal makes soft
Property the lower surface of thrust piece and the bottom land of holding tank between formed the 3rd back pressure cavity, between the 3rd back pressure cavity and the first back pressure cavity lead to
Cross intercommunicating pore connection.
Further, the first back pressure cavity is communicated with the discharge gas after the compression of screw compressor.
Further, flexible thrust part also includes containing part, and the upper surface of containing part is less than the upper surface of push stopping part, is vortexed
Compressor also includes cross slip-ring, and cross slip-ring is arranged on containing part, and under the lower surface of the end plate of orbiter,
The keyway with the key cooperation of cross slip-ring is provided with containing part.
Further, the lower surface of flexible thrust part is provided with rotation preventing device hole, and the bottom land of holding tank is provided with and rotation preventing device
The hole that hole coordinates, to constitute anti-rotation space, rotation preventing device is arranged in anti-rotation space, and prevents the rotation of flexible thrust part.
Further, flexible thrust part includes matrix, and matrix is annulus, and limiting section is the be arranged on the perisporium of annulus
One is raised, and push stopping part is that second be arranged on the upper surface of annulus is raised, the lateral surface of the second raised lateral surface and annulus
Concordantly, the first raised upper surface is higher than the second raised upper surface.
Further, the first raised quantity is three, and along the equally circumferentially spaced of annulus, the second raised quantity
For four, and along the equally circumferentially spaced of annulus.
Further, flexible thrust part also includes containing part, and the upper surface of containing part is less than the upper surface of push stopping part, annulus
Upper surface be located at the second projection in part constitute containing part.
Further, the upper surface of limiting section is more than the thickness of end plate to the distance between the upper surface of push stopping part.
Further, the upper surface of limiting section taking to the difference of the distance between the upper surface of push stopping part and the thickness of end plate
It is 5 μm to 20 μm to be worth scope.
Further, intercommunicating pore is arranged on upper bracket, and extends radially through interior land along screw compressor.
Apply the technical scheme of the present invention, screw compressor includes upper bracket, fixed scroll, orbiter and flexible thrust
Part.Upper bracket includes outer land and interior land, and holding tank is formed between outer land and interior land.To accommodate flexible thrust part.It is quiet
Scroll plate is fixedly installed in outer land, and with the upper surface palette of outer land.Orbiter be arranged on upper bracket with it is quiet
Between scroll plate, orbiter has the end plate being arranged in interior land, and first seal is provided between end plate and interior land,
First seal will be divided into the first back pressure cavity and on the outside of the first back pressure cavity between the back side of orbiter and upper bracket
Second back pressure cavity.Back pressure can be provided by the first back pressure cavity and the second back pressure cavity for orbiter so that orbiter energy
It is enough to be adjacent to fixed scroll, it is ensured that the sealing of screw compressor.Flexible thrust part along screw compressor axially movably
It is arranged in the holding tank between outer land and interior land, flexible thrust part has limiting section and push stopping part, the upper end of limiting section
Face and the lower surface of fixed scroll coordinate, and the upper surface of push stopping part is less than the upper surface of limiting section, the end plate lower end of orbiter
Face and the upper surface of push stopping part coordinate, and second seal are provided between flexible thrust part and holding tank, second seal makes soft
Property the lower surface of thrust piece and the bottom land of holding tank between formed the 3rd back pressure cavity, between the 3rd back pressure cavity and the first back pressure cavity lead to
Cross intercommunicating pore connection.Second back pressure cavity and the 3rd back pressure cavity are respectively at the upper and lower sides of flexible thrust part, by adjusting both sides
Pressure can control flexible thrust part to move, under low-pressure ratio operating mode, and the 3rd back pressure cavity can promote flexible thrust part to move, with
Extra support force is provided for orbiter, to ensure the sealing of screw compressor.Pass through flexible thrust part and the 3rd back pressure
Chamber can improve the sealing between orbiter and fixed scroll under low-pressure ratio operating mode, and the operating of lifting screw compressor can
By property.
Brief description of the drawings
The accompanying drawing for constituting the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the sectional view of the screw compressor of embodiments of the invention；
Fig. 2 shows sectional view of the screw compressor of embodiments of the invention under high pressure ratio operating mode；
Fig. 3 shows sectional view of the screw compressor of embodiments of the invention under low-pressure ratio operating mode；
Fig. 4 shows the sectional view of the screw compressors of embodiments of the invention under separating force extremely high operating mode；With
And
Fig. 5 shows the cross slip-ring of embodiments of the invention and the dimensional structure diagram of flexible thrust part.
Description of reference numerals：1st, compressor housing；2nd, motor stator；3rd, rotor；4th, lower carriage；5th, oil pump；6th, it is bent
Axle；6a, eccentric part；6b, oilhole；7th, bearing；8th, orbiter；8a, end plate；9th, fixed scroll；10th, first seal；
11st, the first back pressure cavity；12nd, the second back pressure cavity；13rd, the 3rd back pressure cavity；14th, flexible thrust part；14a, limiting section；14b, thrust
Portion；14c, containing part；14e, rotation preventing device hole；14f, keyway；15th, second seal；16th, upper bracket；16a, outer land；16b, company
Through hole；16c, interior land；17th, rotation preventing device；18th, cross slip-ring；18a, key.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
As shown in Fig. 1 to 5, embodiments in accordance with the present invention, screw compressor includes upper bracket 16, fixed scroll 9, dynamic whirlpool
Capstan 8 and flexible thrust part 14.
Upper bracket 16 includes outer land 16a and interior land 16c, and holding tank is formed between outer land 16a and interior land 16c.
To accommodate flexible thrust part 14.Fixed scroll 9 is fixedly installed on outer land 16a, and with outer land 16a upper surface sealing paste
Close.
Orbiter 8 is arranged between upper bracket 16 and fixed scroll 9, and orbiter 8, which has, to be arranged on interior land 16c
End plate 8a, be provided with first seal 10 between end plate 8a and interior land 16c, first seal 10 is by the back of the body of orbiter 8
Space between face and upper bracket 16 is divided into the first back pressure cavity 11 and the second back pressure cavity 12 positioned at the outside of the first back pressure cavity 11,
The pressure of first back pressure cavity 11 is higher than the second back pressure cavity 12.Can be dynamic vortex by the first back pressure cavity 11 and the second back pressure cavity 12
Disk 8 provides back pressure so that orbiter 8 can be adjacent to fixed scroll 9, it is ensured that the sealing of screw compressor.
Flexible thrust part 14 is axially movably arranged between outer land 16a and interior land 16c along screw compressor
Holding tank in, flexible thrust part 14 has limiting section 14a and push stopping part 14b, limiting section 14a upper surface and fixed scroll 9
Lower surface coordinate, push stopping part 14b upper surface is less than limiting section 14a upper surface, the end plate 8a of orbiter 8 lower surface
Coordinate with push stopping part 14b upper surface, second seal 15, second seal are provided between flexible thrust part 14 and holding tank
15 make to form the 3rd back pressure cavity 13 between flexible thrust part 14 and holding tank, lead between the 3rd back pressure cavity 13 and the first back pressure cavity 11
Cross intercommunicating pore 16b connections.Second back pressure cavity 12 and the 3rd back pressure cavity 13 are respectively at the upper and lower sides of flexible thrust part 14, by adjusting
The pressure of section both sides can control flexible thrust part 14 to move, and under low-pressure ratio operating mode, the 3rd back pressure cavity 13 can promote flexibility
Thrust piece 14 is moved, to provide extra support force for orbiter 8, to ensure the sealing of screw 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, the 3rd back pressure cavity 13 with
First back pressure cavity 11 is connected, so the pressure of the 3rd back pressure cavity 13 is higher than the pressure of the second back pressure cavity 12.
Orbiter 8 can be improved under low-pressure ratio operating mode by the back pressure cavity 13 of flexible thrust part 14 and the 3rd to be vortexed with quiet
Sealing between disk 9, lifts the operating reliability of screw compressor.
Second seal 15 has two, and one of second seal 15 is located in the internal perisporium of flexible thrust part 14, separately
One second seal 15 is located at outside the periphery wall of flexible thrust part 14, to be formed at the 3rd back pressure of the second back pressure cavity 12 isolation
Chamber 13.
In the present embodiment, the first back pressure cavity 11 is communicated with the discharge gas after the compression of screw compressor, the first back pressure
The pressure of chamber 11 is the pressure at expulsion of screw compressor.Second back pressure cavity 12 is connected with the compressor air suction mouthful of screw compressor.
It ensure that the 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 interferences of screw compressor, flexible thrust part 14 also includes holding
Portion 14c, containing part 14c upper surface are less than push stopping part 14b upper surface, to place the cross slip-ring 18 of screw compressor, ten
Word slip ring 18 is located under the end plate 8a of orbiter 8 lower surface, and the key with cross slip-ring 18 is provided with containing part 14c
The keyway 14f that 18a coordinates, to avoid the key 18a interference with cross slip-ring 18.
In the present embodiment, in order to ensure the only axial movement of flexible thrust part 14, the lower surface of flexible thrust part 14 is set
Rotation preventing device hole 14e is equipped with, the bottom land of holding tank is provided with the hole coordinated with rotation preventing device hole 14e, to constitute anti-rotation space, rotation preventing device
17 are arranged in anti-rotation space, and prevent the rotation of flexible thrust part 14.
In the present embodiment, flexible thrust part 14 includes matrix, and matrix is annulus, and limiting section 14a is to be arranged on annulus
First on perisporium is raised, and push stopping part 14b is that second be arranged on the upper surface of annulus is raised, the second raised lateral surface with
The lateral surface of annulus is concordant, and the first raised upper surface is higher than the second raised upper surface.
First raised quantity is three, and along the equally circumferentially spaced of annulus, the second raised quantity is four, and
Along the equally circumferentially spaced of annulus.To form even support, it is ensured that uniform force.
The upper surface of annulus be located at the second projection in part constitute containing part 14c, keyway 14f by the upper end of annulus towards
Lower recess is formed.
Limiting section 14a upper surface is more than end plate 8a thickness to the distance between push stopping part 14b upper surface.
Limiting section 14a upper surface takes to the difference of the distance between push stopping part 14b upper surface and end plate 8a thickness
It is 5 μm to 20 μm to be worth scope.
Intercommunicating pore 16b is arranged on upper bracket 16, and extends radially through interior land 16c along screw compressor.
Screw compressor also includes being formed with the compressor housing 1 of certain inner space, is arranged on compressor housing 1
Sucked in inner space, compress and discharge the pump assembly of cold media gas, be arranged in the inner space of compressor housing 1 and use
Come drive the electric machine assembly and shafting component of orbiter 8, the upper bracket 16 to support scroll plate group and shafting component and under
Support 4, the oil feed pump 5 to provide lubricating oil to moving component.Pump assembly mainly include fixed scroll 9, orbiter 8,
Cross slip-ring 18 and flexible thrust part 14.Fixed scroll 9 and the formation compression chamber of orbiter 8, cross slip-ring 18 prevent dynamic vortex
The rotation of disk 8, the support orbiter 8 of flexible thrust part 14.
The top of compressor housing 1 sets upper bracket 16, and the placement fixed scroll 9 on the outer land 16a of upper bracket 16.
Fixed scroll 9 has the end face and vortex shape tooth coordinated with outer land 16a, the end face coordinated with outer land 16a and upper bracket 16
Outer land 16a upper surface be in close contact and keep sealing state.Dynamic whirlpool is provided between upper bracket 16 and fixed scroll 9
Capstan 8.Orbiter 8 has end plate 8a and can engage to form the vortex shape of compression chamber with the vortex shape tooth of fixed scroll 9
Tooth.Isolate to form two spaces by first seal 10 between the end plate 8a of orbiter 8 lower surface and upper bracket 16, i.e.,
The first higher back pressure cavity 11 of pressure and the second relatively low back pressure cavity 12 of pressure.
Between upper bracket 16 and fixed scroll 9, the flexible thrust part 14 being axially movable is provided with.Flexible thrust part 14
With the limiting section 14a with the cooperation of the lower surface of fixed scroll 9, and it is relative with the end plate 8a of orbiter 8 lower surface
Push stopping part 14b, while the containing part 14c for the cross slip-ring 18 for preventing the rotation of orbiter 8, and and cross can be placed by also having
The keyway 14f that a pair of keys 18a of slip ring 18 coordinates.
Preferably, to ensure that flexible thrust part 14 is moved without rotating only in the axial direction, opened in the bottom surface of flexible thrust part 14
There is rotation preventing device hole 14e, and be connected by rotation preventing device 17 with upper bracket 16.Wherein, rotation preventing device hole 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, it would however also be possible to employ bond structure or other suitable modes limit soft
The rotation of property thrust piece 14.
Formed between the cell wall of the bottom of flexible thrust part 14 and the holding tank of upper bracket 16 by second seal 15
3rd back pressure cavity 13, the 3rd back pressure cavity 13 is isolated with the second back pressure cavity 12.Lead between 3rd back pressure cavity 13 and the first back pressure cavity 11
Cross intercommunicating pore 16b connections.
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.Bent axle 6 it is upper
Hold and be assemblied in for eccentric part 6a, eccentric part 6a in the bearing 7 of the afterbody of orbiter 8.
The bottom of compressor housing 1 is provided with lower carriage 4, and lower carriage 4 is swung to limit bent axle 6.The bottom of lower carriage 4 is filled
Equipped with oil pump 5.Oil pump 5 provides lubricating oil upwards via the center oilhole 6b of bent axle 6, lubricating oil reach at the top of oilhole 6b after along
Gap between eccentric part 6a and bearing 7 enters the first back pressure cavity 11.Then, sub-fraction lubricating oil can pass through first seal
10 enter the second back pressure cavity 12, and eventually enter into compression chamber, play a part of lubricating and sealing scroll plate.Most of lubricating oil meeting
After the other shafting moving components of the lubrication that flows downward compression motor spindle is returned to along the inwall of compressor housing 1.
When screw compressor is operated, motor driven crankshafts 6 rotate, and bent axle 6 drives orbiter 8 to move.In cross slip-ring
Under 18 limitation, orbiter 8 does translational motion around the axle center of bent axle 6 with fixed radius, so that in orbiter 8 and quiet
Several mutually isolated and volume consecutive variations compression chambers are produced between the scroll wrap of scroll plate 9.Compression chamber is by the refrigeration of suction
The inner space of compressor housing 1 is discharged to after agent compression.Because refrigerant is compressed in compression chamber, pressure rise certainly will be produced
Raw one makes the power that orbiter 8 and fixed scroll 9 are separated.The power can make orbiter 8 away from fixed scroll 9, so as to cause
Produced between each compression chamber and leak and cause compressor performance to decline.
In order to limit this separation, introduce average pressure in the end plate 8a of orbiter 8 lower surface and be higher than pressure of inspiration(Pi)
Back pressure, orbiter 8 is pressed against on fixed scroll 9 by back pressure.
In the present embodiment, first back pressure cavity 11 of first seal 10 and the formation of second seal 15, the second back pressure are passed through
The back pressure cavity 13 of chamber 12 and the 3rd：First back pressure cavity 11 is communicated with the discharge gas after compression, and pressure is generally in pressure at expulsion Pd
Level；Second back pressure cavity 12 is communicated with suction gas, and pressure is generally in pressure of inspiration(Pi) Ps levels：3rd back pressure cavity 13 and first
Connected between back pressure cavity 11 by intercommunicating pore 16b, thus the pressure of the 3rd back pressure cavity 13 is also at pressure at expulsion Pd levels.
It should be noted that, the first back pressure cavity 11, the second back pressure cavity 12 and the 3rd back pressure cavity 13, which can also have, other connects shape
Formula, such as the first back pressure cavity 11 are communicated with discharge gas, and the second back pressure cavity 12 is connected with compression chamber, its pressure is in pressure of inspiration(Pi)
Between pressure at expulsion, the 3rd back pressure cavity 13 is communicated with the first back pressure cavity 11.
If the separating force size that compression chamber is produced is Fa, projected area of the orbiter 8 in the plane perpendicular to axial direction
It is that annulus area between b, two second seals 15 is c for the area of a, first seal 10 circle surrounded.
The first back pressure cavity 11 can then be obtained, the back pressure Fb that the fluid in the second back pressure cavity 12 is produced to orbiter 8
=Ps × (a-b)+Pd × b.
Upward power Fc=(Pd-Ps) × c that fluid is produced to flexible thrust part 14.
With reference to referring to Fig. 2, when screw compressor is operated under the higher operating mode of exhaust, pressure of inspiration(Pi), because in high pressure ratio
Operating mode, (high pressure ratio operating mode is that pressure at expulsion and pressure of inspiration(Pi) ratio are more than 2), now Fb>Fa.Orbiter 8 by back pressure and
Fixed scroll 9 is brought into close contact together.
Flexible thrust part 14 moved up in the presence of power Fc apart from H1 (apart from H1 can be 20 μm to 120 μm), now
Limiting section 14a is contacted with the lower surface of fixed scroll 9.Because limiting section 14a to push stopping part 14b distance is than orbiter 8
Big 5-20 μm or so of end plate 8a thickness, so push stopping part 14b and the end plate 8a of orbiter 8 lower surface have less gap
h1.Therefore, it can now be sealed very well between each compression chamber, and the pressing force between orbiter 8 and fixed scroll 9 is smaller,
Only：
F=Fb-Fa=Ps × (a-b)+Pd × b-Fa.
With reference to referring to Fig. 3, when screw compressor operates in exhaust, pressure of inspiration(Pi) than under relatively low operating mode, due in low pressure
Than operating mode, (low-pressure ratio operating mode is that pressure at expulsion and pressure of inspiration(Pi) ratio are more than 1.2 and less than 2), now Fb<Fa.Orbiter 8 exists
Separated in the presence of separating force Fa with fixed scroll 9, the end plate 8a of orbiter 8 lower surface and the thrust of flexible thrust part 14
Portion 14b is contacted, and flexible thrust part 14 provides additional power Fc to orbiter 8.Now, fluid is produced to flexible thrust part 14
Power Fc>Fa-Fb.
Therefore, flexible thrust part 14 can be still moved up in the presence of Fc apart from H2, limiting section 14a and fixed scroll
9 lower surface contact.But now, there is less gap between the lower surface of fixed scroll 9 and the end plate 8a of orbiter 8
h2.Now there is certain leakage between each compression chamber, but because h2 is very small, can make in the case where processing conditions is met
H2 controls the level as 5-10 μm, therefore leakage is greatly lowered, and compressor performance still keeps higher level.
With reference to referring to Fig. 4, screw compressor operate in separating force it is extremely elevated in the case of when, when screw compressor is present
When impurity or suction excess liq, separating force Fa can steeply rise, now Fa>Fb+Fc.
Orbiter 8 in the presence of separating force and fixed scroll 9 separate, the end plate 8a of orbiter 8 lower surface with
The push stopping part 14b contacts of flexible thrust part 14.Because separating force is excessive, flexible thrust part 14 can be moved downward and fallen back to apart from H3
On upper bracket 16, limiting section 14a is separated with fixed scroll end face 9a.Now, the end of the end face of fixed scroll 9 and orbiter 8
There is larger gap between plate 8a for H3+h3, produce serious leak between each compression chamber, and then reduce separating force, it is to avoid
Too high separating force causes the damage of compressor components.
The limiting section 14a of flexible thrust part 14 is made up of the projection of several pillar-shapeds first for being distributed in outside, and first is raised
End face can be contacted with the lower surface of fixed scroll 9.End plate 8a of limiting section 14a to the push stopping part 14b distance than orbiter 8
Thickness is slightly larger.
In radial directions, inner side is with the containing part 14c for placing cross slip-ring 18 and with ten to flexible thrust part 14
The keyway 14f that a pair of keys 18a of word slip ring 18 coordinates, containing part 14c outside dispersed placement 2 or multiple prolong vertically
Second stretched is raised, and second projection is relative with the end plate 8a of orbiter 8 lower surface, to form push stopping part 14b.Limiting section
14a is located at radial direction outermost.
Flexible thrust part 14 makes it be in air-breathing in the side relative with orbiter 8 in the axial direction using second seal 15
In the environment under low pressure of pressure or intermediate pressure, the side relative with upper bracket 16 is in the hyperbaric environment for being substantially equal to pressure at expulsion
In.In the presence of difference force, flexible thrust part 14 is moved to the side of fixed scroll 9, limiting section 14a and fixed scroll end face 9a
Contact and spacing.
Compressor operating is in higher pressure than under operating mode, orbiter 8 is fitted tightly over one by back pressure and fixed scroll 9
Rise.The limiting section 14a of flexible thrust part 14 is contacted with the lower surface of fixed scroll 9, because limiting section 14a is to push stopping part 14b's
Distance is more slightly larger than the end plate 8a of orbiter 8 thickness, the end plate 8a of push stopping part 14b and orbiter 8 lower surface exist compared with
Small gap, flexible thrust part 14 will not increase the pressing force that orbiter 8 is subject to.
In low-pressure ratio operating mode, separating force between orbiter 8 and fixed scroll 9 is more than back pressure, orbiter 8 with
Fixed scroll 9 is separated.Now, lower surfaces of the limiting section 14a of flexible thrust part 14 still with fixed scroll 9 is contacted, and flexible
The push stopping part 14b of thrust piece 14 is contacted with the end plate 8a of orbiter 8 lower surface.Due to the limit by flexible thrust part 14
System, the gap very little that orbiter 8 is separated, is effectively reduced leakage.
There are the abnormal conditions such as impurity in compression chamber, when the separating force for producing compression chamber rises extremely, flexible thrust part
14 are moved to the side of upper bracket 16, and are contacted with upper bracket 16, and limiting section 14a is separated with the lower surface of fixed scroll 9, simultaneously
The end plate 8a of orbiter 8 lower surface is contacted with the push stopping part 14b of flexible thrust part 14.Now orbiter 8 is vortexed with quiet
Larger gap is produced between disk 9, can decline compression cavity pressure, so as to avoid damage parts.
As can be seen from the above description, the above embodiments of the present invention realize following technique effect：The present invention's
Screw compressor can improve the sealing property of the pump housing under low-pressure ratio operating mode, while ensureing that back pressure is fitted under high pressure ratio operating mode
When Performance And Reliability of the lifting compressor in broad operating range.Additionally due to flexible thrust part of the present invention is by other
Moving component size limitation it is smaller, using the teaching of the invention it is possible to provide larger support force, widened the scope of compressor reliability service.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of screw compressor, it is characterised in that including：
Upper bracket (16), the upper bracket (16) includes outer land (16a) and interior land (16c), the outer land (16a) and institute
State and form holding tank between interior land (16c)；
Fixed scroll (9), the fixed scroll (9) is fixedly installed on the outer land (16a), and with the outer land
The upper surface palette of (16a)；
Orbiter (8), the orbiter (8) is arranged between the upper bracket (16) and the fixed scroll (9), described
Orbiter (8) has the end plate (8a) being arranged on the interior land (16c), the end plate (8a) and the interior land
Be provided with first seal (10) between (16c), the first seal (10) by the back side of the orbiter (8) with it is described
Space between upper bracket (16) is divided into the first back pressure cavity (11) and second back of the body on the outside of first back pressure cavity (11)
Press chamber (12)；
Flexible thrust part (14), the flexible thrust part (14) is axially movably arranged on the outer shroud along screw compressor
In holding tank between platform (16a) and the interior land (16c), the flexible thrust part (14) has limiting section (14a) and stopped
Pushed section (14b), the upper surface of the limiting section (14a) coordinates with the lower surface of the fixed scroll (9), the push stopping part
The upper surface of (14b) be less than the limiting section (14a) upper surface, the lower surface of the end plate (8a) of the orbiter (8) with
The upper surface of the push stopping part (14b) coordinates, and the second sealing is provided between the flexible thrust part (14) and the holding tank
Part (15), the second seal (15) makes to form the 3rd back pressure cavity between the flexible thrust part (14) and the holding tank
(13), connected between the 3rd back pressure cavity (13) and first back pressure cavity (11) by intercommunicating pore (16b).
2. screw compressor according to claim 1, it is characterised in that first back pressure cavity (11) and screw compressor
Compression after discharge gas communicate.
3. screw compressor according to claim 1, it is characterised in that the flexible thrust part (14) also includes containing part
(14c), the upper surface of the containing part (14c) is less than the upper surface of the push stopping part (14b), and screw compressor also includes cross
Slip ring (18), the cross slip-ring (18) is arranged on the containing part (14c), and positioned at the end plate of the orbiter (8)
Under the lower surface of (8a), the keyway with the key cooperation of the cross slip-ring (18) is provided with the containing part (14c)
(14f)。
4. screw compressor according to claim 1, it is characterised in that the lower surface of the flexible thrust part (14) is set
There is rotation preventing device hole (14e), the bottom land of the holding tank is provided with the hole coordinated with the rotation preventing device hole (14e), to constitute anti-rotation
Space, rotation preventing device (17) is arranged in the anti-rotation space, and prevents the rotation of the flexible thrust part (14).
5. screw compressor according to claim 1, it is characterised in that the flexible thrust part (14) includes matrix, institute
Matrix is stated for annulus, the limiting section (14a) is that first be arranged on the perisporium of the annulus is raised, the push stopping part
(14b) is that second be arranged on the upper surface of the annulus is raised, and the described second raised lateral surface is outer with the annulus
Side is concordant, and the described first raised upper surface is higher than the described second raised upper surface.
6. screw compressor according to claim 5, it is characterised in that the described first raised quantity is three, and edge
The annulus it is equally circumferentially spaced, the described second raised quantity is four, and is set at equal intervals along the circumference of the annulus
Put.
7. screw compressor according to claim 5, it is characterised in that the flexible thrust part (14) also includes containing part
(14c), the upper surface of the containing part (14c) is less than the upper surface of the push stopping part (14b), and the upper surface of the annulus is located at
Part in second projection constitutes the containing part (14c).
8. screw compressor according to claim 1, it is characterised in that the upper surface of the limiting section (14a) is described in
The distance between upper surface of push stopping part (14b) is more than the thickness of the end plate (8a).
9. screw compressor according to claim 8, it is characterised in that the upper surface of the limiting section (14a) is described in
The span of the difference of the thickness of the distance between upper surface of push stopping part (14b) and the end plate (8a) is 5 μm to 20 μm.
10. screw compressor according to claim 1, it is characterised in that the intercommunicating pore (16b) is arranged on the upper branch
On frame (16), and the interior land (16c) is extended radially through along the screw compressor.
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| CN201410384217.7A CN105332911B (en) | 2014-08-06 | 2014-08-06 | Screw compressor |
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| CN201410384217.7A CN105332911B (en) | 2014-08-06 | 2014-08-06 | Screw compressor |
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| CN105332911A CN105332911A (en) | 2016-02-17 |
| CN105332911B true CN105332911B (en) | 2017-08-01 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6765263B2 (en) * | 2016-09-14 | 2020-10-07 | 日立ジョンソンコントロールズ空調株式会社 | Scroll compressor |
| 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 |
| 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 |
| CN108953143B (en) * | 2018-09-13 | 2024-01-30 | 珠海格力节能环保制冷技术研究中心有限公司 | Scroll compressor and air conditioner with same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5188520A (en) * | 1990-07-13 | 1993-02-23 | Mitsubishi Denki Kabushiki Kaisha | Scroll type compressor with frames supporting the crankshaft |
| CN1254801A (en) * | 1998-11-20 | 2000-05-31 | 三菱电机株式会社 | Vortex compressor |
| CN1333433A (en) * | 2000-07-11 | 2002-01-30 | 富士通将军股份有限公司 | Turbine compressor |
| CN1507541A (en) * | 2002-03-04 | 2004-06-23 | ͬ�Ϳ�ҵ��ʽ���� | Scroll compressor |
| CN204041454U (en) * | 2014-08-06 | 2014-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Scroll compressor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4514106B2 (en) * | 2004-04-12 | 2010-07-28 | 日立アプライアンス株式会社 | Scroll compressor |
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2014
- 2014-08-06 CN CN201410384217.7A patent/CN105332911B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5188520A (en) * | 1990-07-13 | 1993-02-23 | Mitsubishi Denki Kabushiki Kaisha | Scroll type compressor with frames supporting the crankshaft |
| CN1254801A (en) * | 1998-11-20 | 2000-05-31 | 三菱电机株式会社 | Vortex compressor |
| CN1333433A (en) * | 2000-07-11 | 2002-01-30 | 富士通将军股份有限公司 | Turbine compressor |
| CN1507541A (en) * | 2002-03-04 | 2004-06-23 | ͬ�Ϳ�ҵ��ʽ���� | Scroll compressor |
| CN204041454U (en) * | 2014-08-06 | 2014-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Scroll compressor |
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| CN105332911A (en) | 2016-02-17 |
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