CN110067749A - Screw compressor with capacity modulation - Google Patents
Screw compressor with capacity modulation Download PDFInfo
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- CN110067749A CN110067749A CN201810059904.XA CN201810059904A CN110067749A CN 110067749 A CN110067749 A CN 110067749A CN 201810059904 A CN201810059904 A CN 201810059904A CN 110067749 A CN110067749 A CN 110067749A
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- screw compressor
- compression chamber
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- bypass
- chamber group
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
- F04C18/0223—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving with symmetrical double wraps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
Abstract
This disclosure relates to screw compressor comprising compression assembly and capacity modulation, compression assembly include the determine vortex component and dynamic vortex component being fitted to each other to be compressed to working medium, and capacity modulation is configured to that the capacity of compression assembly is adjusted.Determine vortex component and dynamic vortex component respectively include the first volution blade and the second volution blade and define therebetween the first compression chamber group independent of each other and the second compression chamber group.Capacity modulation includes bypass, bypass makes at least one of the first compression chamber group and the second compression chamber group selectively bypass the displacement volume for thus allowing flexibly and on a large scale to adjust compressor in the case where not sacrificing compressor pressure ratio to the suction pressure region of screw compressor.
Description
Technical field
This disclosure relates to screw compressor technical field, more particularly, to the scroll compression with capacity modulation
Machine.
Background technique
The content of this part provides only background information relevant to the disclosure, may not constitute the prior art.
It is known that screw compressor belongs to the compressor mechanical of capacity formula compression.The compression assembly of screw compressor is usual
Including determine vortex component and dynamic vortex component.In general, determine vortex component and dynamic vortex component respectively include the vortex of single molded line
Blade, be fitted to each other between two volution blades (or engagingly engaging) and formed a series of compression chambers to working medium (
Referred to as working fluid, such as gaseous refrigerant) it is compressed, and compressed high pressure gas is discharged by exhaust outlet.
According to the needs of operating condition, screw compressor may include that a variety of capacity adjusting mechanisms are held with the work for changing compressor
Amount.Typically, capacity adjusting mechanism may include extending through the fluid channel of scroll element selectively to provide compressor
Compression pocket and another pressure area between fluid communication.For example, in the application of refrigeration system, in order to solve sub-load
The demand of cooling capacity makes the pressure ratio of scroll element become smaller often through the part molded line of bypass volution blade, adjusts compression to reach
The purpose of the displacement volume of machine, and then preferably matched with sub-load cooling capacity.
Since the molded line length of volution blade is limited, thus the adjustable model of the pressure ratio of compressor or displacement volume
It encloses also very limited.For example, if this screw compressor of the relevant technologies will reach 50% displacement volume regulating power,
Need scroll element that there is longer molded line, to be unfavorable for the compact designed of compressor.For this capacity regulating mode,
It can not the biggish pressure ratio requirement of adaptation range.
Summary of the invention
Based on this, one of the disclosure be designed to provide it is a kind of it is novel, with can neatly adjust compressor
The scroll compression of the capacity modulation of displacement volume.
Another object of the present disclosure be to make the scroll compression with capacity modulation it is further improve with
The displacement volume regulating power of screw compressor is improved when not increasing compressor size.
Another object of the present disclosure is to provide a kind of permission flexible design, the good screw compressor knot of compatibility
Structure, to improve the operational efficiency of screw compressor.
According to one aspect of the disclosure, a kind of screw compressor is provided comprising: compression assembly, the compression group
Part includes the determine vortex component and dynamic vortex component being fitted to each other to be compressed to working medium；And capacity modulation, it is described
Capacity modulation is configured to that the capacity of the compression assembly is adjusted, and the determine vortex component includes the first determine vortex leaf
Piece and the second determine vortex blade, the dynamic vortex component include the first dynamic vortex blade and the second dynamic vortex blade, wherein described
The first compression chamber group independent of each other and the second compression chamber group are defined between determine vortex component and the dynamic vortex component, it is described
Capacity modulation includes annular ring and bypass, an open end of the bypass and the first compression chamber group and
Another open end of the connection of one of described second compression chamber group, the bypass can be closed or be beaten by annular ring
It opens to be selectively connected to the suction pressure region of the screw compressor, wherein under full-load operation state, the annular
Circle sealing covers another open end of the bypass to turn off the bypass；Under capacity regulating state,
Annular ring moves away from another open end to open the bypass.
In some embodiments, it is respectively formed with back pressure cavity and variable pressure chamber in the two sides up and down of annular ring,
The back pressure cavity is connected to the other of the first compression chamber group and the second compression chamber group, the variable pressure chamber energy
It is enough to be selectively connected to the back pressure cavity or the suction pressure region, annular ring by means of the back pressure cavity and it is described can
The difference sealing covering of active force of the pressure changeable chamber in annular ring moves away from another open end.
In some embodiments, the variable pressure chamber by control valve selectively with the back pressure cavity or the suction
Atmospheric pressure area connection, wherein when the variable pressure chamber is connected to the suction pressure region, annular ring turns off the side
Road all, and when the variable pressure chamber is connected to the back pressure cavity, annular ring opens the bypass.
In some embodiments, restriction is formed in the side back to the dynamic vortex component of the determine vortex component
The cylindrical portion of the exhaust passage of the screw compressor, the first row port of the first compression chamber group and second compression chamber
The second exhaust port of group is connected to the exhaust passage.
In some embodiments, check valve is provided at the first row port and second exhaust port.
In some embodiments, annular ring is fitted at the peripheral surface of the cylindrical portion, annular ring packet
Include the arch for being suitable for sealing the straight portion for another open end for covering the bypass and being spaced apart with the cylindrical portion
Shape part, annular ring upside and limit the back pressure cavity between the arcuate part and the cylindrical portion, in institute
The downside for stating annular ring limits the variable pressure chamber by the arcuate part.
In some embodiments, the back pressure cavity and the variable pressure chamber are in the determine vortex component or the dynamic whirlpool
The axis projection for revolving component is in the shape of concentric ring.
In some embodiments, two volution blades of the first compression chamber group are formed and form second compression
Two volution blades of chamber group are asymmetric setting.
In some embodiments, two volution blades of the first compression chamber group are formed and form second compression
Two volution blades of chamber group are arranged symmetrically.
In some embodiments, the screw compressor further include: the first injection access, the first injection access structure
It causes that one or more compression chambers in the first compression chamber group will be supplied to from the fluid of external fluid supply apparatus；
And the second injection access, the second injection passway structure is at will be from the fluid of the fluid supply apparatus supplied to described
One or more compression chambers in second compression chamber group, wherein the first injection access and the second injection passway structure
At the closing when corresponding compression chamber group is bypassed via the bypass to the suction pressure region.
A kind of screw compressor another aspect of the present disclosure provides comprising compression assembly, the compression group
Part includes the determine vortex component and dynamic vortex component being fitted to each other to be compressed to working medium；And capacity modulation, it is described
Capacity modulation is configured to that the capacity of the compression assembly is adjusted, and the determine vortex component includes the first determine vortex leaf
Piece and the second determine vortex blade, the dynamic vortex component include the first dynamic vortex blade and the second dynamic vortex blade, wherein described
The first compression chamber group independent of each other and the second compression chamber group are defined between determine vortex component and the dynamic vortex component, through institute
The working medium for stating the compression of the first compression chamber group is discharged from first row port, and the working medium through the second compression chamber group compression is from second row
Port discharge, the capacity modulation include bypass, the first row air cavity being connected to the first row port and with institute
State second exhaust port connection second row air cavity, the bypass by with the first row air cavity and the second row air cavity
At least one of connection and make corresponding compression chamber group selection in the first compression chamber group and the second compression chamber group
Ground is bypassed to the suction pressure region of the screw compressor.
In some embodiments, the determine vortex component include the determine vortex main part that removably connects and
Cover board limits the first row air cavity and the second row air cavity, institute between the determine vortex main part and the cover board
It states first row air cavity and the second row air cavity is separated from one another.
In some embodiments, it is provided with the first row air cavity and first pressure in the determine vortex main part
Multiple capacity regulating channels of contracting chamber group connection and the second row air cavity is connected to the second compression chamber group multiple
Capacity regulating channel, and list is both provided with for each capacity regulating channel in the first row air cavity and second row air cavity
To valve, the check valve only allows working medium to flow into corresponding discharge chamber from the capacity regulating channel.
In some embodiments, the first back pressure is formed in the side back to the determine vortex main part of the cover board
Chamber and the second back pressure cavity, first back pressure cavity are connected to by the first backpressure passage with the first compression chamber group, and described second
Back pressure cavity is connected to by the second backpressure passage with the second compression chamber group.
In some embodiments, inner cylinder is formed in the side back to the determine vortex main part of the cover board
Portion, middle circle canister portion and outer cylinder portion, the inner space of the inner cylindrical section with respectively from the first row air cavity and described the
Two exhaust passages connection that two discharge chambers extend, limits described the between the inner cylindrical section and the middle circle canister portion
One of one back pressure cavity and second back pressure cavity limit described between the middle circle canister portion and the outer cylinder portion
The other of first back pressure cavity and second back pressure cavity.
In some embodiments, the axial throwing of first back pressure cavity and the second back pressure cavity on the determine vortex component
Shadow is in the shape of concentric ring.
In some embodiments, it is provided with control valve in the bypass, the bypass is controlled with selectivity
It turns on and off.
According to the another aspect of the disclosure, a kind of screw compressor is provided comprising compression assembly, the compression group
Part includes the determine vortex component and dynamic vortex component being fitted to each other to be compressed to working medium, and the determine vortex component is fixed to institute
State the shell of screw compressor and cannot be axially displaced；And capacity modulation, the capacity modulation are configured to institute
The capacity for stating compression assembly is adjusted, and the determine vortex component includes the first determine vortex blade and the second determine vortex blade, institute
Stating dynamic vortex component includes the first dynamic vortex blade and the second dynamic vortex blade, wherein the determine vortex component and the dynamic whirlpool
The first compression chamber group independent of each other and the second compression chamber group are defined between rotation component, through the first compression chamber group compression
Working medium is discharged from first row port, and the working medium through the second compression chamber group compression is discharged from second exhaust port, the capacity tune
Section system includes bypass and the exhaust that is connected to at least one of the first row port and the second exhaust port
Chamber, it is right in the first compression chamber group and the second compression chamber group that the bypass is made and being connected to the discharge chamber
Bypass to the suction pressure region of the screw compressor to the compression chamber group selection answered.
In some embodiments, the determine vortex component include the determine vortex main part that removably connects and
Cover board limits the discharge chamber between the determine vortex main part and the cover board.
In some embodiments, the discharge chamber is connected to the first row port, the second exhaust port with it is described
The pressure at expulsion area of screw compressor is connected to.
In some embodiments, the cross section semicircular in shape of the discharge chamber.
In some embodiments, it is provided with the discharge chamber and first compression chamber in the determine vortex main part
Multiple capacity regulating channels of group connection, and be both provided with unidirectionally in the discharge chamber for each capacity regulating channel
Valve, the check valve only allow working medium to flow into the discharge chamber from the capacity regulating channel.
In some embodiments, it is respectively arranged at the second exhaust port and at the discharge chamber and only allows working medium
The check valve of outflow.
In some embodiments, the bypass is from the discharge chamber, extends through the scroll compression
The shell of machine and be connected on the outside of the shell suction pressure region pipeline form.
In some embodiments, it is provided with control valve in the pipeline, the open-minded of the bypass is controlled with selectivity
And shutdown.
It can be separately for every group of vortex by using double-round scroll compression component according to the screw compressor of the disclosure
Compression chamber corresponding to blade carries out capacity regulating, thus the pressure ratio without influencing another group of volution blade allows do not sacrificing
The displacement volume that compressor flexibly and is on a large scale adjusted in the case where compressor pressure ratio, meets wanting for compressor compact designed
It asks, substantially increases the efficiency and applicability of compressor, be with a wide range of applications.In addition, according to the scroll compression of the disclosure
Contracting machine can also adjust accordingly the injection fluid supply to each injection access according to the operational mode of screw compressor, thus
The flexibility of screw compressor application is improved, the efficiency of system operation is improved.
Detailed description of the invention
By description referring to the drawings, the feature and advantage of one or several embodiments of the disclosure will become more
Add and is readily appreciated that, in the accompanying drawings:
Fig. 1 shows the longitudinal sectional view of the screw compressor of the first illustrative embodiments according to the disclosure, wherein
Bypass is in close state；
Fig. 2 schematically shows the determine vortex components and dynamic vortex component according to disclosure embodiment in working condition
Under look up transverse sectional view；
Fig. 3 is the longitudinal sectional view for only showing the compression assembly of screw compressor of Fig. 1, wherein bypass is in and beats
Open state；
Fig. 4 shows the longitudinal sectional view of the screw compressor of the second illustrative embodiments according to the disclosure；
Fig. 5 shows the exploded perspective view of the determine vortex component of the screw compressor of Fig. 4；
Fig. 6 shows the vertical view that the determine vortex component of the screw compressor of Fig. 4 is laterally splitted at the position of exhaust space
Perspective view；
Fig. 7 shows the longitudinal sectional view of the screw compressor of the third illustrative embodiments according to the disclosure；And
Fig. 8 shows the example perspective of the determine vortex component of the combination fluid ejection technique according to disclosure embodiment
Figure.
Specific embodiment
It is below describe to be merely exemplary in nature and be not intended to the limitation disclosure and its application or use.It should manage
It solves, corresponding appended drawing reference indicates identical or corresponding component and feature always in attached drawing.
As described above, it has been noted that, respectively for common, determine vortex component and dynamic vortex component in the related technology
It is provided with the individual pen scroll compression component of single volution blade, in the work for adjusting compressor by way of by-passing part molded line
There is significant limitation when capacity.However, being each provided with two volution blades for determine vortex component and dynamic vortex component
Novel double-round scroll compression component, since it has two groups of volution blades, it is possible to separately for every group of volution blade institute
Corresponding compression chamber carries out capacity regulating, the pressure ratio without influencing another group of volution blade.For this purpose, the applicant is by using double
Circle scroll compression component simultaneously solves the above problem by designing following compressor.
The introduction of the disclosure is suitable for being incorporated into a variety of different types of scroll compressors, including air-tight machine, spacious
Open drive-type machine and non-hermetic machines.For exemplary purposes, it is complete to be shown as low-side for the screw compressor of the disclosure
Close vertical vortex.That is, the drive motor and compression assembly of screw compressor are arranged at the air-breathing of seal casinghousing
In pressure area.
Referring to Fig. 1, the vertical of screw compressor 100 in accordance with one embodiment of the present disclosure is shown to the illustrated example
To cross-sectional view.Compressor 100 may include the shell 110 generally closed off and the motor 120 being arranged in shell 110, driving
Axis 130, main bearing seat 140 and compression assembly.
Shell 110 may include the main housing part 111 of general cylindrical shape, the top being arranged at the upper end of main housing part 111
Lid 112 and the bottom cover 113 being arranged at the lower end of main housing part 111.It is provided between top cover 112 and main housing part 111
The inner space of shell 110 is separated into suction pressure region SL and pressure at expulsion area SH by partition 101, partition 101.101 He of partition
Space composition pressure at expulsion area SH between top cover 112, and the space structure between partition 101, main housing part 111 and bottom cover 113
At suction pressure region SL.In suction pressure region, SL is provided with the inlet suction port 102 for sucking working medium, and in pressure at expulsion area, SH is set
It is equipped with the exhaust joint 103 for compressed working medium to be discharged.Suction pressure region SL is referred to as low pressure side region as a result,
And pressure at expulsion area SH is referred to as high pressure side region.Partition 101 includes across partition 101 to provide compression assembly and row
The central aperture of connection between atmospheric pressure area SH.
Motor 120 may include stator 121 and rotor 122.Stator 121 can be using any suitable way relative to shell
Body 110 is fixed.The radially inner side of stator 121 is arranged in rotor 122, and while being powered can rotate in stator 121.Drive shaft
130 extend through rotor 122 and can make rotating motion with rotor 122.The upper end of drive shaft 130 is via base bearing by leading
Bearing block 140 supports, and lower end is supported via lower bearing by step 104.Main bearing seat 140 and step 104 are fixed
It is connected to the main housing part 111 of shell 110.Grease channel (not shown) is formed in drive shaft 130, by lubricating oil
The components such as main bearing seat 140, compression assembly on top are supplied to from the oil sump 105 for being located at 110 lower part of shell to provide
Lubrication.
Compression assembly is supported by main bearing seat 140 and including determine vortex component 150 and dynamic vortex component 160.Determine vortex
Component 150 can be fixed relative to shell 110 in any suitable manner, such as is fixed by bolts in main bearing seat 140.Shape
Cooperate the hub 161 in dynamic vortex component 160 at eccentric crank pin 131 in one end of drive shaft 130, with flat part
In, to drive dynamic vortex component 160 relative to 150 translation rotation of determine vortex component (that is, the central axis of dynamic vortex component 160
Central axis around determine vortex component 150 rotates, but dynamic vortex component 160 itself will not be rotated around the central axis of itself),
And then realize the compression of working medium.Above-mentioned translation rotation is sliding by the cross engaged with determine vortex component 150 and dynamic vortex component 160
Ring 106 is realized.Cross slip-ring 106 can be set between dynamic vortex component 160 and main bearing seat 140, also can be set fixed
Between scroll element 150 and dynamic vortex component 160.
Unlike individual pen scroll compression modular construction, according to the determine vortex component 150 of the screw compressor of the disclosure
Respectively there are two volution blades for tool with dynamic vortex component 160.For example, from the double-round shown in Fig. 2 according to disclosure embodiment
One exemplary transverse sectional view of scroll compression component can see, and include first according to the determine vortex component 150 of the disclosure
Determine vortex blade 151 and the second determine vortex blade 152, and dynamic vortex component 160 includes that the first dynamic vortex blade 161 and second is dynamic
Volution blade 162.First dynamic vortex blade 161 respectively with the first determine vortex blade 151 and the second determine vortex blade 152 engagingly
Engagement is to form the first compression chamber group C1.First compression chamber group C1 may include the radial direction positioned at the first dynamic vortex blade 161
The first sub- compression chamber group C1B of the sub- compression chamber group C1A of the first of inside and the radial outside positioned at the first dynamic vortex blade 161.
Similarly, the second dynamic vortex blade 162 is engagingly engaged with the first determine vortex blade 151 and the second determine vortex blade 152 respectively
To form the second compression chamber group C2.Second compression chamber group C2 may include the radially inner side positioned at the second dynamic vortex blade 162
The second sub- compression chamber group C2A and the radial outside positioned at the second dynamic vortex blade 162 the second sub- compression chamber group C2B.First
Compression chamber group C1 and the second compression chamber group C2 carry out squeeze operation and including respective air inlet section and exhaust independently of one another
Section.Can on the periphery of determine vortex component 150 at approximately radial opposite position setting respectively with first compression chamber
Group C1 and corresponding first air entry of the second compression chamber group C2 and the second air entry.For other designs that are vortexed, first inhales
Port and the second air entry may be at other positions, and can be merged into an air entry.It can be in determine vortex component 150
Determine vortex end plate 158 on first row corresponding with the first compression chamber group C1 and the second compression chamber group C2 respectively is set
Port O1 and second exhaust port O2, for the height compressed through the first compression chamber group C1 and the second compression chamber group C2 to be discharged respectively
It calms the anger body.First compression chamber group C1 and the second compression chamber group C2 (or more specifically each sub- compression chamber group) respectively may include
It is located substantially at radial outside and is in the low pressure chamber of pressure of inspiration(Pi), is located substantially at radially inner side and be in the height of pressure at expulsion
Press the middle pressure chamber of chamber and pressure therebetween.With the operation of screw compressor, positioned at the low pressure chamber of outermost radial outside
Radially intermediate part gradually is moved to from radial outside along the molded line direction of volution blade and becomes middle pressure chamber, then further
It is moved along molded line direction to radially inner side and becomes high pressure chest, finally by the obtained high pressure gas of compression from corresponding exhaust outlet
Discharge.
The double-round screw compressor so constructed can switch between oepration at full load mode and capacity regulating mode.?
Under oepration at full load mode (that is, by two pairs of volution blades compressed to working medium simultaneously), two compression chamber groups C1 and C2 into
The compression of row working medium.Under capacity regulating mode, a compression chamber group in two compression chamber groups C1 and C2 (such as the first compression
Chamber group C1) it can selectively be bypassed to suction pressure region, so that this bypassed compression chamber group substantially will not be to work
Matter is compressed, so as to realize the reduction of compressor displacement and the reduction of power consumption.
As shown in the longitudinal sectional view of the screw compressor 100 of embodiment out shown in Fig. 1, whirlpool can determined
The one or more bypass BP in axial direction extending through determine vortex end plate, bypass BP are set in rotation end plate 158
It may include the first open end being opened in one of compression chamber of the first compression chamber group C1 and being opened in determine vortex end plate 158
The second open end in top surface.Referring to Fig. 1 and Fig. 3, determine vortex component 150 may include at the top surface of its end plate 158
The exhaust passage 157 limited by cylindrical portion 156.The first row port O1 and second exhaust port O2 of double-round scroll compression component can be with
It is connected to the pressure at expulsion area SH positioned at 101 other side of partition via the central aperture in exhaust passage 157 and partition 101, with
The high pressure gas compressed via compression assembly is discharged to outside screw compressor by exhaust joint 103.Similarly, it is
Prevent the fluid of pressure at expulsion area SH from flowing back into air-breathing via first row port O1 and second exhaust port O2 in some cases
Pressure area SL, can be arranged check valve 107 at first row port O1 and second exhaust port O2, and check valve 107 can be arbitrarily
Check valve of appropriate type, such as valve block, spring check valve etc..
Annular ring 180 is fitted at the peripheral surface of cylindrical portion 156, and is such as exemplarily illustrated in Fig. 1 and Fig. 3
, annular ring 180 includes forming the straight portion of face contact with the top surface of determine vortex component 150 and being spaced with cylindrical portion 156
The central arch portion opened.First annular recess portion is limited between the central arch portion and cylindrical portion 156 of annular ring 180,
And the second annular recess is limited between the central arch portion of annular ring 180 and the top surface of determine vortex component 150.The
One annular recess and the second annular recess are isolated from each other.Closed back pressure cavity 181 can be formed in first annular recess portion, and
The second closed variable pressure chamber 182 can be formed in the second annular recess.Back pressure cavity 181 can be via backpressure passage (figure
In be not shown) be connected to one of middle pressure chamber of compression assembly and establish back pressure P1 wherein.It is compressed as a result, in compression assembly
Determine vortex component 150 and dynamic vortex component 160 is kept to abut against each other during gas, while the axial direction for providing scroll element is soft
Property, so that it is guaranteed that operation and floating seal that compressor is safe and reliable.In this embodiment, it is pressed in bypass BP and first
In the case where contracting chamber group C1 connection (that is, first compression chamber group C1 of bypass), backpressure passage is preferably with the second compression chamber group C2's
One middle pressure chamber connection, vice versa, therefore ensures that the pressure remained steady of the back pressure cavity 181 when carrying out capacity regulating.Second
Variable pressure chamber 182 can be connected to external pressure source (not shown) and establish pressure P2 wherein.As shown, due to
Back pressure cavity 181 and the second variable pressure chamber 182 are built up in the two opposite sides of annular ring 180 respectively, thus respectively in the vertical direction
Apply contrary directed force F 1 and F2 on annular ring 180.Directed force F 1, the size of F2 and pressure P1, P2 and its effect
Area is positively correlated, that is, meets F=P*S.
When the directed force F 1 straight down that pressure P1 applies on annular ring 180 is greater than pressure P2 on annular ring 180
When the directed force F 2 straight up applied, the holding of annular ring 180 is pressed on the top surface of determine vortex end plate 158, thus ring
The straight portion of shape circle 180 covers and closes off the second open end of bypass BP, and bypass BP closes (referring to Fig. 1), whirlpool
Rotation compressor 100 is in full load operational mode.
When the directed force F 1 straight down that pressure P1 applies on annular ring 180 is less than pressure P2 on annular ring 180
The directed force F 2 straight up and directed force F 2 applied is greater than the gravity of directed force F 1 and annular ring 180 in side straight down
When upward resultant force, annular ring 180 will be lifted far from determine vortex component 150 (referring to Fig. 3) under the action of power F2, thus be made
It opens and is connected to the suction pressure region SL of surrounding in the second open end of bypass BP.At this point, be connected to bypass BP
Pressure in compression chamber becomes external lower pressure, i.e. pressure of inspiration(Pi) P3, thus realize the compressor operating capacity of reduction
It adjusts.
Herein, the opening and closing of bypass BP can be adjusted and the external pressure by control external pressure source
The pressure P2 of the second variable pressure chamber 182 of source connection is realized.The case where the active area of pressure P1 and P2 immobilize
Under, make the directed force F 2 on direction straight up be greater than the active force in vertically downward direction by increasing pressure P2
The resultant force (once operating condition determines that the size of the resultant force is substantially constant) of the gravity of F1 and annular ring 180, it is logical to open bypass
Road BP；By reducing the resultant force for the gravity that pressure P2 makes directed force F 2 be less than directed force F 1 and annular ring 180, it is logical to close bypass
Road BP, and pressure P2 is smaller, directed force F 2 is just smaller, and thus, it is possible to more preferably by means of above-mentioned resultant force by annular ring 180
Straight portion is sealed against the top of the second open end of bypass BP.
For example, the active area of pressure P1 can be designed in embodiment as shown in Figure 1 less than pressure P2's
Active area, so that directed force F 2 is just enough to overcome directed force F 1 and annular ring 180 in the case where pressure P1 and P2 equal
The resultant force of gravity and open bypass BP, and make pressure P2 be equal to pressure of inspiration(Pi) P3 in the case where bypass BP close
It closes.Thus, it is possible to which the by-passing valve using such as solenoid valve etc makes the second variable pressure chamber 182 be connected to (side with back pressure cavity 181
All road BP open) working condition be connected to (bypass BP with outside suction pressure region SL with the second variable pressure chamber 182 is made
Close) working condition between switch over.Furthermore it is possible to control the make-and-break time of bypass BP by impulse modulation.
Although illustrating only the bypass in axial direction extending through determine vortex end plate 158 in the embodiment of Fig. 1
BP, but optionally, bypass BP can also include angling hole (that is, the axis relative to determine vortex component 150 obliquely prolongs
The hole stretched), axial hole and the transverse holes in determine vortex end plate 158 and being in fluid communication with each other are set (that is, perpendicular to determine vortex portion
The axis of part 150 and the hole extended) combination or axial hole and angling hole combination (not shown).Also, bypass BP is also
Can in determine vortex end plate 158 branch, thus formed second open end correspond to multiple first open ends branch bypass
Path.That is, can be the setting position of the second open end and annular ring 180 that do not change bypass BP the case where
Under, bypass BP is connected to as needed by travel path of the design bypass BP in determine vortex end plate 158
Low pressure in first row port O1 and/or second exhaust port O2 and the first compression chamber group C1 and/or the second compression chamber group C2
The first open end of one of chamber, middle pressure chamber and high pressure chest or more persons.Therefore, the specific set-up mode of bypass can
To be adjusted according to the actual situation, it is not limited with structure described herein.
According to first embodiment, screw compressor 100 can bypass the first compression chamber group C1 or the second compression chamber group
The capacity regulating for example from 50%-100% is realized further combined with the make-and-break time of control bypass BP in the case where C2.
It is understood that it is that volution blade is symmetrical that switching of the above-mentioned compressor capacity between 50% and 100% is corresponding
The compressor of (the molded line length of volution blade identical, symmetrical shape), and for two asymmetric compressors of volution blade
Situation also may be implemented other capacity ratios, such as can switch between 70% and 100%.
In this embodiment, annular ring 180 for example can be excellent by metal material or other suitable cast molds
Selection of land annular ring 180 by with scroll element 150,160 identical cast molds.Furthermore, it is possible in the bottom table of annular ring 180
Gasket is set on face or on the top surface of determine vortex end plate 158 and preferably around the second open end of bypass BP
Circle, in favor of ensuring that bypass BP's is closed, thus the effect of improving compressor.It is appreciated that with 150 shape of determine vortex component
It is also not necessarily limited to configuration shown by the disclosure at the configuration of annular ring 180 in sealing contact, but can be formed as any and be suitble to
Configuration, as long as it can be suitble to establish pressure chamber in two opposite sides while closing bypass BP.Furthermore it is possible to
Understand, although not shown in the drawings, to ensure determine vortex component 150 and annular ring 180 uniform stressed in circumferential direction, back pressure cavity
181 and second variable pressure chamber 182 be all formed as annular and its axis projection on determine vortex component 150 be in concentric ring shape
Formula.
Next, by the screw compressor referring to fig. 4 to fig. 6 description according to the second illustrative embodiments of the disclosure
200.In addition to the first number is by different embodiments serial number, same appended drawing reference will be continued to use to indicate and the first embodiment party
The same or similar component of formula, and omission is described in greater detail.
As shown in figure 4, in order to realize pressure-variable ratio (VVR), it is different from the screw compressor 100 of first embodiment
It is that the determine vortex component 250 of screw compressor 200 adopts a split structure, that is, includes determine vortex main part 253 and cover board
254, the two is fixed together for example, by bolt (not shown).Determine vortex main part 253 is including determine vortex end plate 258 and vertically
In the first determine vortex blade and the second determine vortex blade that determine vortex end plate 258 extends.In conjunction with Figures 5 and 6, in cover board 254 and determine
Be formed with generally circular exhaust space CS between vortex main part 253, exhaust space CS in the embodiment as shown by
The recess portion 254a of 254 downside of cover board is formed, it should be appreciated that exhaust space CS can also be by determine vortex main part 253
The recess portion of side is formed, or is collectively formed by cover board 254 and determine vortex main part 253.Lattice is formed in recess portion 254a
254b, lattice 254b are extended downwardly from cover board 254.It is understood that lattice 254b can also be from determine vortex main part
253 upwardly extend or are collectively formed by cover board 254 and determine vortex main part 253.As shown in fig. 6, lattice 254b is determining whirlpool
It is passed through between first row port O1 and second exhaust port O2 on rotation end plate 258, so that exhaust space CS is divided into first row
Air cavity CS1 and second row air cavity CS2, wherein first row air cavity CS1 is connected to the first row port O1 on determine vortex end plate 258,
Second row air cavity CS2 is connected to the second exhaust port O2 on determine vortex end plate 258.In addition, referring to fig. 4, cover board 254 substantially
Central location is also correspondingly provided with the first exhaust passage being connected to first row air cavity CS1 (due to cutting angle, in figure
It is not shown) and the second exhaust channel 257a that is connected to second row air cavity CS2.Outside first exhaust passage and second exhaust channel
It is respectively arranged with a check valve CV (illustrating only a check valve CV being connected to second exhaust channel 257a), by two
The discharge pressure of exhaust outlet is set as the system pressure outside check valve CV (that is, the condenser for being provided with the system of compressor 1 enters
Mouth pressure), the maximum pressure of first row air cavity CS1 and second row air cavity CS2 are all by the system pressure outside check valve CV as a result,
It determines.It will be understood by those skilled in the art that the above-mentioned check valve CV being arranged on cover board 254 can be saved, but fixed
Setting is used to control the check valve of exhaust at first row port O1 and second exhaust port O2 on vortex end plate 258.
Referring to fig. 4 and Fig. 6, in each chamber in first row air cavity CS1 and second row air cavity CS2, in determine vortex main body
Check valve V there are three being respectively set in portion 253, and a capacity tune is correspondingly provided in the lower section of each check valve V
Channel VL is saved, corresponding compression chamber group C1 or C2 are led to.Specifically, appearance corresponding to the check valve V in first row air cavity CS1
Amount adjusts channel VL1 and leads to the first compression chamber group C1, and capacity regulating corresponding to the check valve V in second row air cavity CS2 is logical
Road VL2 leads to the second compression chamber group C2, and these capacity regulating channels VL1, VL2 respectively lead to the compression in different pressures
In chamber.Fig. 1 shows portion capacity and adjusts channel VL1 and VL2.It is understood that the list of different number and position also can be set
To valve V and capacity regulating channel VL, to selectively communicate with the compression chamber for being in different pressures.Pressure in corresponding compression chamber
When power is greater than the pressure above check valve V (pressure in first row air cavity CS1 or second row air cavity CS2), check valve V can be single
It is opened upward to ground.And the pressure above check valve V be greater than compression chamber in pressure when, check valve V close.That is, check valve V
Only working medium is allowed uniaxially to flow in corresponding discharge chamber from compression chamber.
When compressor 1 is capable of providing biggish compression ratio (i.e. biggish discharge pressure) however the compression ratio of system needs
When smaller (i.e. system pressure is smaller), if working medium is compressed completely and in first row port O1 and second exhaust port by compression assembly
O2 discharge, then working medium will be overly compressed then demi-inflation again, cause certain power loss.However it is being provided with check valve
In the case where V, when working medium compression partway when, the pressure of corresponding compression chamber may be at some or multiple check valve V
Reach emission request, that is, reach system pressure, corresponding check valve V and above-mentioned check valve CV can be opened at this time, and working medium mentions
It is preceding discharge and without excess compression.On the other hand, the compression ratio being capable of providing when compressor is relatively small, and the pressure that system needs
Contracting than it is relatively large when, the pressure at first row port O1 and second exhaust port O2 is likely less than system pressure, can not open lid
Check valve CV on plate 254, pressure is gathered in first row air cavity CS1 and second row air cavity CS2 at this time, and check valve CV keeps closing
It closes, and compression assembly continues to compress more working medium, until the pressure in first row air cavity CS1 and second row air cavity CS2 is super
The system pressure outside check valve CV is crossed, thereby, it is possible to provide different discharges in an adaptive way with same compression assembly
Pressure.
As shown, being additionally provided with bypass BP in determine vortex end plate 258.Bypass BP is axial hole and cross
To the combined form in hole (that is, the hole extended perpendicular to the axis of determine vortex component 150), and have and first row air cavity
First open end of CS1 connection and the second open end being connected to suction pressure region SL, so as to selectively by first row
Air cavity CS1 is connected to suction pressure region SL, that is, so that pressure (and the pressure of the first compression chamber group C1 in first row air cavity CS1
Power) it is reduced to pressure of inspiration(Pi).For example, the logical of bypass BP can be controlled by the switch valve (not shown) of solenoid valve etc
It is disconnected.
In the state of compressor full-load operation, bypass BP is to close.When bypass BP is opened, first
The pressure of discharge chamber CS1 becomes external lower pressure, i.e. pressure of inspiration(Pi).Due to the pressure reduction of first row air cavity CS1, first
All check valve V in discharge chamber CS1 are opened, the first compression chamber group C1 for being connected with first row air cavity CS1 (including be located at
The first of the radially inner and outer two sides of first dynamic vortex blade compression chamber group C1A and C1B) in pressure release within a very short time
It puts, becomes pressure of inspiration(Pi).Thus, it is possible to which the second compression chamber group C2 is used only, (diameter including being located at the second dynamic vortex blade is inside
The second of outer two sides sub- compression chamber group C2A and C2B) compress working medium.At this point, being vortexed for the double-round with symmetrical volution blade
For compressor, the capacity of compressor becomes half when full-load operation state.Pass through the logical of control such as bypass BP
The disconnected time, the capacity regulating for example from 50%-100% may be implemented.As described above, due to first row air cavity CS1 and second
Discharge chamber CS2 is isolated by lattice 254b, can be easily by the way that another bypass and phase is arranged for second row air cavity CS2
The control valve answered, to realize the capacity regulating from 0%-100%.Further, it is also possible to realize it using asymmetric volution blade
His capacity ratio.
Further, as shown in Figure 4 and Figure 5, in the upside of the cover board 254 of the determine vortex component 250 of second embodiment
Limit two back pressure cavities, i.e. the first back pressure cavity 281a and the second back pressure cavity 281b, wherein the first back pressure cavity 281a is via first
Backpressure passage 278 is connected to the first compression chamber group C1, and the second back pressure cavity 281b is via the second backpressure passage 279 and the second compression chamber
Group C2 connection.For this purpose, cover board 254 includes: substrate 254e, above-mentioned recess portion 254a, first exhaust passage (not shown) and
Two exhaust passage 257a are both formed in substrate 254e；The inner cylindrical section 254g upwardly extended from substrate 254e, inner cylindrical section
First exhaust passage and second exhaust channel of the 254g on substrate 254e, that is, first exhaust passage and second exhaust channel
Positioned at the inner radial of inner cylindrical section 254g, the exhaust in first exhaust passage and second exhaust channel is by inner cylindrical section 254g's
Inner space formation exhaust passage 257 collects and the pressure at expulsion area SH with 201 top of the central aperture of partition 201 and partition
It is connected to and is in system pressure；Outer cylinder portion 254h extends and concentric with inner cylindrical section 254g from the periphery of substrate 254e
Ground setting；And the middle circle canister portion 254j between inner cylindrical section 254g and outer cylinder portion 254h.In inner cylindrical section 254g
The first back pressure cavity 281a is limited between middle circle canister portion 254j, is limited between middle circle canister portion 254j and outer cylinder portion 254h
Make the second back pressure cavity 281b.The axial direction of first back pressure cavity 281a and the second back pressure cavity 281b on determine vortex component 250 as a result,
Projection, so as to provide uniform back pressure in circumferential direction, prevents the side of determine vortex component 250 in the form of concentric ring
Incline.As mentioned above, back pressure is established to ensure the safe and reliable operation of compressor and floating seal.
Can by change two back pressure cavities 281a and 281b effective area (i.e. the back pressure cavity is in determine vortex component 250
On axial projective area) or change the position of compression chamber that backpressure passage is connected to determine back pressure that back pressure cavity can be provided
Power.
It is understood that this split type knot that determine vortex component 250 is formed by determine vortex main part 253 and cover board 254
Structure is intended merely to facilitate setting check valve V, using other kinds of check valve or is being not provided with check valve V
And in the case where the VL of capacity regulating channel, the determine vortex component of integral type can be used.At this point, being retouched in above embodiment
The feature of the determine vortex main part 253 and cover board 254 stated is understood as being set up directly on integrated determine vortex component.Example
Such as, the first back pressure cavity and the second back pressure cavity are formed in the upside of determine vortex component, and bypass BP and backpressure passage are all
It is arranged in determine vortex end plate.
The embodiment of Fig. 1 and Fig. 4 provides the exemplary structure of compressor of the scroll element with axial elasticity.Under
Face, by the screw compressor 300 referring to Fig. 7 description according to disclosure third embodiment.With the scroll compression of first embodiment
Unlike contracting machine 100,200, screw compressor 300 fixes the structure of (that is, not having axial elasticity) using determine vortex component.
Therefore, it will be described below mainly for these differences.
In screw compressor 300 shown in Fig. 7, determine vortex component 350, which is fixed to shell 310 by bracket 301, not to be had
There is axial displacement.Bracket 301 can be set into be substantially flush with the top surface of determine vortex component 350.Bracket 301, determine vortex component
Space composition pressure at expulsion area SH between 350 and top cover 312, and the sky between bracket 301, main housing part 311 and bottom cover 313
Between constitute suction pressure region SL.
As shown in fig. 7, due to not providing axial elasticity, the top of determine vortex component 350 directly connects with pressure at expulsion area SH
It is logical, and it is not provided with the component relevant to axial elasticity such as back pressure cavity, floating seal.With the screw compressor of second embodiment
200 is similar, and the determine vortex component 350 of screw compressor 300 adopts a split structure, that is, include determine vortex main part 353 and
Cover board 354, the two is fixed together for example, by bolt.Cover board 354 for example can be semicircular, cover board 354 and determine whirlpool
Rotation main part 353 between be formed with discharge chamber CS, discharge chamber CS in the embodiment shown in Fig. 7 only with the first compression chamber group
C1 be located at determine vortex end plate 358 on first row port O1 connection, without with the second compression chamber group C2 be located at determine vortex end
Second exhaust port O2 connection on plate 358.As shown, second exhaust port O2 leads directly to pressure at expulsion area SH.It can distinguish
One check valve CV is set on second exhaust port O2 and cover board 354, the discharge pressure of two exhaust outlets O1, O2 are set as
System pressure outside check valve CV, as a result, the maximum pressure of second exhaust port O2 and discharge chamber CS all by check valve outside
System pressure determines.
In addition, the screw compressor 200 with second embodiment is similar, in discharge chamber CS, in determine vortex main part 253
On several check valve V can be set, and be arranged in correspondence with a capacity regulating channel in the lower section of each check valve V, this
A little capacity regulating channels are respectively led in the compression chamber in different pressures of the first compression chamber group C1, to selectively communicate with place
In the compression chamber of different pressures, realize pressure-variable ratio (VVR).When working medium compression partway when, as needed, some or it is multiple
The pressure of corresponding compression chamber may have reached emission request at check valve V, that is, reach system pressure, corresponding at this time unidirectional
Valve V and above-mentioned check valve CV can be opened, and working medium is discharged in advance and without excess compression.
As shown in fig. 7, discharge chamber CS is also connected to via bypass BP with suction pressure region SL.In this embodiment,
Bypass BP is not arranged in the form of the intercommunicating pore in determine vortex end plate, but is provided in the form of individual pipeline.It should
Pipeline extends through the shell 310 of compressor 300 and from shell 310 since the first open end led in discharge chamber CS
Outside extends towards suction pressure region SL, eventually terminates at and is connected to across shell 310 with the suction pressure region SL of 310 inside of shell
The second open end.The control valve 308 of such as solenoid valve etc is provided in pipeline, to control discharge chamber CS and suction pressure region
The connection of SL.Control valve 308 is opened, and discharge chamber CS is connected to suction pressure region SL, the pressure reduction in discharge chamber CS to air-breathing
Pressure, all check valve V in discharge chamber CS are opened, and the pressure in the first compression chamber group C1 being connected with discharge chamber CS is released
It puts, becomes pressure of inspiration(Pi).Thus, it is possible to compress working medium using only the second compression chamber group C2, the volume of compressor becomes entirely negative
Half when lotus working condition.Further, it by controlling the switch off time of bypass BP, may be implemented for example from 50%-
100% capacity regulating.
Certainly, in the embodiment shown in figure, according to the range and size of required discharge chamber CS, cover board 354 can be with structure
Other suitable shapes are caused, and discharge chamber CS can be only connected to the second compression chamber group C2.It is also contemplated that for the second pressure
Another discharge chamber, bypass and corresponding control valve is arranged in contracting chamber group C2.Implement for example, cover board 354 can be similar to second
Cover board 254 in mode, to form two discharge chambers.Bypass BP can be with branch, and can use three-way control valve
It is connected to selectively to provide the connection of pressure of inspiration(Pi) with disconnection.The second compression chamber group C2 can also be bypassed as a result, to air-breathing
Pressure area SL is to carry out capacity regulating, alternatively, the first compression chamber group C1 and the second compression chamber group C2 can be made all bypassed, from
And carry out the larger range of capacity regulating from 0%-100%.
Although the second open end for showing bypass BP in Fig. 7 passes through main housing part 311 and is connected to suction pressure region
SL, but optionally, the second open end of bypass BP can be communicates directly to air inlet pipeline, such as be communicated to inlet suction port
At 302.
According to the screw compressor of disclosure three of the above illustrative embodiments, by using double-round scroll compression component
And allow flexibly and on a large scale to adjust the displacement volume of compressor in the case where not sacrificing compressor pressure ratio, meet compressor
The requirement of compact designed substantially increases the efficiency and applicability of compressor, is with a wide range of applications.
In addition to this, it is known that in order to adapt to the variation of screw compressor institute application environment, in individual pen screw compressor
There is fluid ejection technique through application, i.e., is sprayed by one or more compression chambers in a series of compression chambers to screw compressor
Working fluid helps to reduce delivery temperature, improves pressure ratio and/or increases enthalpy difference etc., thus ensuring system operation reliability
Heating/refrigerating capacity is improved simultaneously, improves system effectiveness.In general, fluid ejection technique is for example, by heat exchanger, expansion
Valve, economizer etc. to the gas being discharged from screw compressor in the process of processing, by a portion central fluid (such as
Overheated gas or liquid from economizer) it is ejected into screw compressor participates in compression process again, needed for being achieved in
Purpose.
But to maximize cooling capacity, the spray-hole for carrying out this fluid injection generally requires to be arranged in the outer part as far as possible, together
When be arranged within compression chamber enclosed point again, therefore, for be designed to by bypass volution blade part molded line hold
The individual pen scroll compression component adjusted is measured, will be unable to be normally carried out fluid injection while capacity regulating, thus is unfavorable for pressing
The optimization of contracting machine integral working.As described above, since double-round scroll compression component can be separately for every group of vortex
Compression chamber corresponding to blade carries out operation of the capacity regulating without influencing another group of volution blade, therefore allows in capacity regulating
While be normally carried out fluid injection for another group of volution blade.
As described below, in the double-round screw compressor as above designed can also with applicating fluid spraying technique,
And fluid ejection technique can be used in combination with capacity modulation technique discussed above, be answered so that screw compressor is better achieved
Flexibility, the raising of system effectiveness and/or the reduction of component costs.
In accordance with one embodiment of the present disclosure, as shown in figure 8, whirlpool can be determined in determine vortex component 150,250,350
The first injection access EVI1 of setting and the second injection access EVI2 on end plate 158,258,358 is revolved, outside will be come from respectively
Fluid supply apparatus (not shown) fluid supplied to the first compression chamber group C1 and the second compression chamber group C2 (for example, being supplied to
Respective middle pressure chamber).Optionally, the first injection access EVI1 and the second injection access EVI2 can be disposed in such a manner: fixed
It opens up and is respectively communicated in the first compression chamber group C1 and the second compression chamber group C2 accordingly on vortex end plate 158,258,358
The injection axial hole AH1 and AH2 of compression chamber (such as middle pressure chamber) and prolong from the circumferential surface of the determine vortex end plate 158,258,358
Extend to the injection transverse holes (part that can see in such as Fig. 8) of described injection axial hole AH1, AH2.Pass through the injection as a result,
Axial hole and injection transverse holes are in fluid communication with each other to constitute the first injection access EVI1 and the second injection access
EVI2, so as to which corresponding first compression chamber group C1 or the second compression chamber group C2 will be introduced from external fluid.Certainly,
The first injection access EVI1 and the second injection access EVI2 can be set using other modes, not with the description of the disclosure
It is limited.The control valve of such as switch valve can be respectively set to control for the first injection access EVI1 and the second injection access EVI2
Beginning, end and/or the amount of injection of fluid injection.
When enabling bypass BP (not shown) bypasses the first compression chamber group C1, it is connected to bypass
The first compression chamber group C1 be substantially not involved in the compression to working medium, it is advantageous to be cut to the first compression chamber group C1
Fluid injection supply, with reduce energy consumption, improve effect.In this case, switch valve and the control of bypass BP are controlled
The switch valve of first injection access EVI1, which can be set into, takes predetermined operation.For example, in accordance with one embodiment of the present disclosure,
The first switch valve V1 for opening or closing the first injection access EVI1, and described can be set on screw compressor
One switch valve V1 can be controlled so as to: be closed while opening the bypass BP, to block the fluid supply dress
It sets to the fluid injection supply of corresponding first injection access EVI1；And it, can basis after closing the bypass BP
The predetermined operating condition of compressor is opened, so that it is logical to allow the fluid from the fluid supply apparatus to be provided to first injection
Road EVI1.First switch valve can use electromagnetic switch valve.
The second switch valve opened or closed for the second injection access EVI2 can be provided, so as to independently of the first spray
Access EVI1 is penetrated selectively to block or allow the fluid injection of the fluid supply apparatus to the second injection access
EVI2.To be controlled respectively by two groups of switch valves in corresponding first injection access EVI1 and the second injection access EVI2
Fluid injection supply.
Further, it is also possible to which flow control valve is arranged between the first switch valve and the fluid supply apparatus, it is used for
Adjust the flow for the fluid injection supplied from the fluid supply apparatus.Further, it is also possible to be provided with for bypass BP's
The third switch valve of opening and closing.Optionally, the second switch valve and third switch valve may each be electromagnetic switch valve.
As a result, under the oepration at full load mode of screw compressor, can control first switch valve and second switch valve with
It opens to the fluid injection supply of the first injection access EVI1 and the second injection access EVI2.And it can control flow control valve
To adjust the fluid injection supply of fluid supply apparatus.Meanwhile can control third switch valve makes it keep bypass BP
Closing, so as to realize the fluid injection under oepration at full load mode.And when needing to carry out capacity regulating, it can control
Third switch valve opens bypass BP and can control first switch valve at the same time and be cut to the first injection access EVI1's
Fluid injection supply, and stay open second switch valve.Thus, it is possible to only to holding while carrying out capacity regulating
The compression chamber group of squeeze operation carries out fluid injection, the effect of so as to avoid the excess waste of resource, improve system.
Using above-mentioned configuration, it is only necessary to two injection accesses and corresponding be arranged on determine vortex component 150,250,350
Bypass is all realized the control that is open and shut off of these accesses by other switch valve or control valve, that is, passes through electromagnetism
The mode of control is realized.Therefore, such embodiment will not bring excessive variation to scroll compressor structure, be particularly conducive to
Existing double-round screw compressor is improved and enhancing efficiency.Simultaneously as electricity can be passed through to the control of individual channel
Magnet valve carries out, and therefore, is conducive to the further integration Management and comprehensively control of system applied by screw compressor.
Alternatively it is possible to which the mechanical valve knot of the fluid injection supply for controlling the first injection access EVI1 is arranged
Structure, to close the first injection access EVI1 when the bypass BP is opened, to reduce answering for system control logic
Polygamy improves system reliability of operation, reduces cost.
The various embodiments and modification of the disclosure have been described in detail above, but those skilled in the art should manage
Solution, the disclosure are not limited to above-mentioned specific embodiment and modification but may include other various possible combinations and knot
It closes.It may be effected by one skilled in the art other modifications and change without departing from the spirit and scope of the disclosure
Body.All these modifications and variant are both fallen in the scope of the present disclosure.Moreover, all components described herein can be by other
Technical equivalent component replaces.
Claims (22)
1. a kind of screw compressor (100), comprising:
Compression assembly, the compression assembly include being fitted to each other with the determine vortex component (150) compressed to working medium and dynamic whirlpool
It revolves component (160)；And
Capacity modulation, the capacity modulation are configured to that the capacity of the compression assembly is adjusted,
It is characterized in that,
The determine vortex component includes the first determine vortex blade (151) and the second determine vortex blade (152), the dynamic vortex component
Including the first dynamic vortex blade (161) and the second dynamic vortex blade (162), wherein the determine vortex component and the dynamic vortex
The first compression chamber group (C1) independent of each other and the second compression chamber group (C2) are defined between component,
The capacity modulation includes annular ring (180) and bypass (BP), an open end of the bypass with
One of the first compression chamber group and described second compression chamber group are connected to, and another open end of the bypass can be by
Annular ring closing is opened to be selectively connected to the suction pressure region of the screw compressor (SL), wherein complete
Under load operating conditions, annular ring sealing covers another open end of the bypass to turn off the bypass
Access；Under capacity regulating state, annular ring moves away from another open end to open the bypass.
2. screw compressor according to claim 1, wherein be respectively formed with back pressure in the two sides up and down of annular ring
Chamber (181) and variable pressure chamber (182), the back pressure cavity with it is another in the first compression chamber group and the second compression chamber group
One connection, the variable pressure chamber can be selectively connected to the back pressure cavity or the suction pressure region, the annular
Enclose the difference sealing covering or mobile remote of the active force by means of the back pressure cavity and the variable pressure chamber in annular ring
From another open end.
3. screw compressor according to claim 2, wherein the variable pressure chamber by control valve selectively with institute
State back pressure cavity or suction pressure region connection, wherein described when the variable pressure chamber is connected to the suction pressure region
Annular ring turns off the bypass, and when the variable pressure chamber is connected to the back pressure cavity, annular ring opens institute
State bypass.
4. screw compressor according to claim 2 or 3, wherein in the determine vortex component back to the dynamic vortex
The side of component is formed with the cylindrical portion (156) for limiting the exhaust passage (157) of the screw compressor, first compression chamber
The first row port (O1) of group and the second exhaust port (O2) of the second compression chamber group are connected to the exhaust passage.
5. screw compressor according to claim 4, wherein be provided at the first row port and second exhaust port
Check valve (107).
6. screw compressor according to claim 4, wherein annular ring is fitted in the peripheral surface of the cylindrical portion
Place, annular ring include straight portion suitable for sealing another open end for covering the bypass and with the circle
Canister portion arcuate part spaced apart, annular ring upside and limit between the arcuate part and the cylindrical portion institute
Back pressure cavity is stated, the variable pressure chamber is limited by the arcuate part in the downside of annular ring.
7. screw compressor according to claim 2 or 3, wherein the back pressure cavity and the variable pressure chamber are described
The axis projection of determine vortex component or the dynamic vortex component is in the shape of concentric ring.
8. a kind of screw compressor (200,300), comprising:
Compression assembly, the compression assembly include be fitted to each other determine vortex component (250,350) to be compressed to working medium and
Dynamic vortex component (260,360)；And
Capacity modulation, the capacity modulation are configured to that the capacity of the compression assembly is adjusted,
It is characterized in that,
The determine vortex component includes the first determine vortex blade (151) and the second determine vortex blade (152), the dynamic vortex component
Including the first dynamic vortex blade (161) and the second dynamic vortex blade (162), wherein the determine vortex component and the dynamic vortex
The first compression chamber group (C1) independent of each other and the second compression chamber group (C2) are defined between component, through the first compression chamber group
The working medium of compression is discharged from first row port (O1), and the working medium through the second compression chamber group compression is arranged from second exhaust port (O2)
Out,
The capacity modulation include bypass (BP) and in the first row port and the second exhaust port
The discharge chamber (CS) of at least one connection, the bypass make the first compression chamber group and being connected to the discharge chamber
It bypasses with compression chamber group selection corresponding in the second compression chamber group to the suction pressure region of the screw compressor
(SL)。
9. screw compressor according to claim 8, wherein the determine vortex component includes removably connecting
Determine vortex main part (253,353) and cover board (254,354), limited between the determine vortex main part and the cover board
The discharge chamber.
10. screw compressor according to claim 8 or claim 9, wherein the determine vortex component is fixed to the scroll compression
The shell (310) of machine and cannot be axially displaced, the discharge chamber is connected to the first row port, the second exhaust port and institute
State pressure at expulsion area (SH) connection of screw compressor.
11. screw compressor according to claim 10, wherein be provided in the determine vortex main part by the exhaust
Multiple capacity regulating channels that chamber is connected to the first compression chamber group, and each capacity regulating is directed in the discharge chamber
Channel is both provided with check valve (V), and the check valve only allows working medium to flow into the discharge chamber from the capacity regulating channel.
12. screw compressor according to claim 10, wherein punished at the second exhaust port with the discharge chamber
It is not provided with the check valve (CV) for only working medium being allowed to flow out.
13. screw compressor according to claim 8 or claim 9, wherein the bypass be from the discharge chamber,
It extends through the shell of the screw compressor and is connected to the shape of the pipeline of the suction pressure region on the outside of the shell
Formula.
14. screw compressor according to claim 9, wherein the discharge chamber includes being connected to the first row port
First row air cavity (CS1) and the second row air cavity (CS2) that is connected to the second exhaust port, the first row air cavity and described
Second row air cavity is separated from one another, the bypass can in the first row air cavity and the second row air cavity at least
One connection.
15. screw compressor according to claim 14, wherein be provided in the determine vortex main part by described first
Multiple capacity regulating channels (VL1) that discharge chamber is connected to the first compression chamber group and by the second row air cavity with it is described
Multiple capacity regulating channels (VL2) of second compression chamber group connection, and the needle in the first row air cavity and second row air cavity
Each capacity regulating channel is both provided with check valve (V), the check valve only allows working medium to flow from the capacity regulating channel
Enter corresponding discharge chamber.
16. screw compressor according to claim 14 or 15, wherein in the cover board back to the determine vortex main body
The side in portion is formed with the first back pressure cavity (281a) and the second back pressure cavity (281b), and first back pressure cavity is logical by the first back pressure
Road (278) is connected to the first compression chamber group, and second back pressure cavity passes through the second backpressure passage (279) and second pressure
The connection of contracting chamber group.
17. screw compressor according to claim 16, wherein in the cover board back to the determine vortex main part
Side is formed with inner cylindrical section (254g), middle circle canister portion (254j) and outer cylinder portion (254h), the inside of the inner cylindrical section
Space be connected to respectively from two exhaust passages that the first row air cavity and the second row air cavity extend, in the inner cylinder
One of first back pressure cavity and second back pressure cavity are limited between portion and the middle circle canister portion, in the centre
The other of first back pressure cavity and second back pressure cavity are limited between cylindrical portion and the outer cylinder portion.
18. screw compressor according to claim 17, wherein first back pressure cavity and the second back pressure cavity are described fixed
Axis projection on scroll element is in the shape of concentric ring.
19. the screw compressor according to any one of claim 8,9,14,15, wherein set in the bypass
It is equipped with control valve and turning on and off for the bypass is controlled with selectivity.
20. screw compressor described in any one of -3,8,9,14,15 according to claim 1, wherein form described first
Two volution blades of compression chamber group and two volution blades for forming the second compression chamber group are asymmetric setting.
21. screw compressor described in any one of -3,8,9,14,15 according to claim 1, wherein form described first
Two volution blades of compression chamber group and two volution blades for forming the second compression chamber group are arranged symmetrically.
22. screw compressor described in any one of -3,8,9,14,15 according to claim 1, further includes:
First injection access (EVI1), the first injection passway structure from the fluid of external fluid supply apparatus at will supply
It should be to one or more compression chambers in the first compression chamber group；And
Second injection access (EVI2), the second injection passway structure from the fluid of the fluid supply apparatus at will supply
One or more compression chambers extremely in the second compression chamber group,
Wherein, it is described first injection access and it is described second injection passway structure in corresponding compression chamber group via the bypass
Closing when access is bypassed to the suction pressure region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810059904.XA CN110067749A (en) | 2018-01-22 | 2018-01-22 | Screw compressor with capacity modulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810059904.XA CN110067749A (en) | 2018-01-22 | 2018-01-22 | Screw compressor with capacity modulation |
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| CN110067749A true CN110067749A (en) | 2019-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810059904.XA Pending CN110067749A (en) | 2018-01-22 | 2018-01-22 | Screw compressor with capacity modulation |
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| CN111306060A (en) * | 2020-02-26 | 2020-06-19 | 安徽美芝精密制造有限公司 | Scroll compressor and refrigeration equipment |
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| WO2021088467A1 (en) * | 2019-11-04 | 2021-05-14 | 艾默生环境优化技术(苏州)有限公司 | Scroll compressor |
| CN113007093A (en) * | 2019-12-20 | 2021-06-22 | 艾默生环境优化技术(苏州)有限公司 | Scroll compressor having a plurality of scroll members |
| WO2023124711A1 (en) * | 2021-12-31 | 2023-07-06 | 广东美的白色家电技术创新中心有限公司 | Compressor, temperature control apparatus, method for controlling temperature control apparatus, and related apparatus |
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