CN109654016A - Screw compressor, air conditioner and screw compressor backpressure regulation method - Google Patents
Screw compressor, air conditioner and screw compressor backpressure regulation method Download PDFInfo
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- CN109654016A CN109654016A CN201811545156.2A CN201811545156A CN109654016A CN 109654016 A CN109654016 A CN 109654016A CN 201811545156 A CN201811545156 A CN 201811545156A CN 109654016 A CN109654016 A CN 109654016A
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- Prior art keywords
- pressure
- chamber
- screw compressor
- control valve
- interface channel
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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
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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
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
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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
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
Abstract
The present invention provides a kind of screw compressor, air conditioner and screw compressor backpressure regulation methods.Screw compressor, comprising: mounting bracket；Fixed scroll；Orbiter has compression chamber between orbiter and fixed scroll, have middle pressure chamber between orbiter and mounting bracket, all have low pressure air suction chamber at the top of the bottom of mounting bracket and fixed scroll；First interface channel, both ends are connected to compression chamber and middle pressure chamber respectively, and the first control valve is provided on the first interface channel；Second interface channel, both ends are connected to middle pressure chamber and low pressure air suction chamber respectively, and the second control valve is provided on the second interface channel.Of the invention enables to the pressure that back pressure is intracavitary under same operating to be basically stable at phase same level, and pump housing sealing is more reliable, promotes compressor performance.And under different operating conditions, compression chamber of the invention can obtain of substantially equal sealing surplus, and pump housing sealing is more reliable, promote the adaptability for working condition of compressor, promote compressor entirety efficiency.
Description
Technical field
The present invention relates to compression set technical fields, in particular to a kind of screw compressor, air conditioner and scroll compression
Contracting machine backpressure regulation method.
Background technique
Screw compressor is that one kind is high-efficient, noise is low and the positive displacement compressor of smooth running, is answered extensively in recent years
For in air-conditioning and refrigeration unit.In general, screw compressor is by sealing shell, orbiter, fixed scroll, crankshaft, anti-
The components such as free-wheeling system and motor composition.It forms several pairs of crescent moon Shape closeds by a pair of intermeshing dynamic and static scroll wrap
Working chamber.In the screw compressor course of work, in scroll plate the effects of due to gas force, centrifugal force, it is made to topple or mutually
Disengaging causes gas leakage to aggravate with friction.The prior art usually with orbiter or fixed scroll relocatable form, and its back
It is realized close between dynamic and static vortex to scrollwork side setting back pressure chamber to generate back pressure to balance overturning effect power or torque
Envelope.If back pressure design is unreasonable, compressor performance and reliability are directly affected: if back pressure is superfluous, the orbiting and fixed scroll
Between to be adjacent to active force excessive, friction power loss, which increases even, there is abrasion, adhesion, and performance and reliability is caused to decline；If back
Insufficient pressure, orbiter topple, vortex pump housing serious leak, and refrigerating capacity decline, power consumption increases, and delivery temperature is inclined
Height also causes performance and reliability to decline.Therefore, design suitable back pressure be screw compressor realize high efficiency with it is highly reliable
The key technology of property.
Application No. is the patents of 201210023627.X to disclose a kind of screw compressor back-pressure structure, which is
Thermal expansion loss for existing intermittent communication back pressure technology is improved, repeatedly swollen to reduce the oil gas accumulated in back pressure hole
Hot-fluid bulk diffusion caused by swollen or compression, still, the source of pressure of back pressure cavity is still by between back pressure cavity and compression chamber
Intermittent communication is to obtain suitable intermediate pressure.The main drawback of the back pressure technology is:
1, be between back pressure cavity and compression chamber in crank angle range the period be back and forth connected to, and the pressure of compression chamber is in song
It is gradually changed within the scope of Shaft angle, the pressure oscillation for then resulting in back pressure cavity is big.The fluctuation of back-pressure will cause to float close
Seal the fluctuation of power, and it is theoretical close surplus is measured with the average pressure of back pressure cavity when checking, Pressure in Back-pressure Cavity is fluctuated to minimum
When compression chamber sealing surplus may deficiency cause the pump housing to leak, and compression chamber sealing surplus can when Pressure in Back-pressure Cavity is fluctuated to maximum
Pump housing contact wear can be caused to increase greatly very much.In short, Pressure in Back-pressure Cavity wave will be brought under the gap mode of communicating of the prior art
It is dynamic；
2, the gap between compression chamber and back pressure cavity is connected to angular dimension and determines Pressure in Back-pressure Cavity size, due to that can not adjust
Whole connection angular dimension will consider the sealing surplus of compression chamber under different operating conditions, for example, summer high temperature system at the beginning of design
When hot suction pressure of compressor it is high and in winter low-temperature heating when pressure of inspiration(Pi) it is low, compression chamber compression one is entered when pressure of inspiration(Pi) is high
Determining to enter back pressure cavity after angle causes back-pressure big, and Pressure in Back-pressure Cavity is small when pressure of inspiration(Pi) is low, and compressor under low-temperature heating
Often there is different degrees of under-voltage contracting, the sealing in the case where same back pressure cavity is connected to angle with compression chamber, under low-temperature heating operating condition
Surplus is minimum, therefore, the sealing surplus in order to ensure remaining to reliably seal between low-temperature heating lower pump body, under high-temperature refrigeration operating condition
It is bigger than normal, cause compressor friction power loss under these operating conditions bigger than normal.
Summary of the invention
The main purpose of the present invention is to provide a kind of screw compressor, air conditioner and screw compressor backpressure regulation sides
Method is big to solve Pressure in Back-pressure Cavity fluctuation when the back pressure cavity of screw compressor in the prior art is connected to the compression chamber resting period
The problem of.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of screw compressor, comprising: shell；
Mounting bracket, the mounting bracket are fixedly mounted on the enclosure interior；Fixed scroll, the fixed scroll are mounted on the peace
It fills on bracket；Orbiter, the orbiter are installed in rotation between the mounting bracket and the fixed scroll, institute
Stating has compression chamber between orbiter and the fixed scroll, have middle pressure between the orbiter and the mounting bracket
Low pressure air suction chamber is all had at the top of chamber, the bottom of the mounting bracket and the fixed scroll；First interface channel, it is described
The both ends of first interface channel are connected to the compression chamber and medium pressure chamber respectively, and is provided on first interface channel
One control valve；Second interface channel, the both ends of second interface channel respectively with medium pressure chamber and the low pressure air suction chamber
It is connected to, is provided with the second control valve on second interface channel.
Further, first interface channel is arranged on the orbiter.
Further, the institute in the mounting bracket and with the mounting bracket bottom is arranged in second interface channel
State the connection of low pressure air suction chamber.
Further, second interface channel extend along the mounting bracket and the fixed scroll and with the quiet whirlpool
Low pressure air suction chamber connection at the top of capstan.
Further, first control valve is the first one way stop peturn valve, the circulating direction of first one way stop peturn valve
For from the compression chamber to medium pressure chamber.
Further, second control valve is the second one way stop peturn valve, the circulating direction of second one way stop peturn valve
For from medium pressure chamber to the low pressure air suction chamber.
Further, first interface channel and second interface channel include non-return valve seat mounting portion, middle pressure
Chamber side intercommunicating pore, sealing circular conical surface and compression chamber side intercommunicating pore, the sealing circular conical surface are located at the non-return valve seat mounting portion
Bore ends are connected to close to medium pressure chamber side, compression chamber side intercommunicating pore is positioned at the recessed of the non-return valve seat mounting portion side wall
Slot；First control valve and second control valve include the first valve seat, elastomeric element and seal member, the sealing
Component is mounted at the sealing circular conical surface, and first valve seat is mounted in the non-return valve seat mounting portion, the elastic portion
It is supported between first valve seat and the seal member respectively at the both ends of part.
Further, first interface channel includes non-return valve seat mounting hole and middle pressure chamber intercommunicating pore；First control
Valve processed includes diaphragm seal and the second valve seat, and the diaphragm seal is located at the bottom of second valve seat, is arranged on second valve seat
There is through-hole.
Further, second valve seat includes ontology and the outward flange that the body peripheral is arranged in, the diaphragm seal
Positioned at the inside of the outward flange, the through-hole is provided on the ontology.
Further, second control valve is flap valve piece one way stop peturn valve.
According to another aspect of the present invention, a kind of air conditioner, including screw compressor are provided, the screw compressor is
Above-mentioned screw compressor.
In accordance with a further aspect of the present invention, a kind of backpressure regulation method of screw compressor, the scroll compression are provided
The backpressure regulation method of machine realizes that the backpressure regulation method of the screw compressor includes: to work as using above-mentioned screw compressor
When pressure Pb in middle pressure chamber is higher than the pressure Ps predetermined value of low pressure air suction chamber, the first control valve on the first interface channel is opened
It opens, prevents fluid countercurrent current to the compression chamber in middle pressure chamber from causing the pressure oscillation in middle pressure chamber and compression chamber, make in middle pressure chamber
Pressure maximum, which can be stablized, is being connected to a certain pressure Pb before terminating with compression chamber, passes through the first control valve, the second control valve, compression
The lower realization of common adjusting control of the preload resistance △ P of cavity pressure Pm, low pressure air suction cavity pressure Ps and the second control valve is following
Control: (1) in pressure cavity pressure Pb be greater than low pressure air suction chamber pressure Ps and the second control valve preload resistance △ P when, i.e. Pb >
(Ps+ △ P), the second control valve of control are opened, and fluid leaks to low pressure air suction chamber in middle pressure chamber, finally makes the pressure in middle pressure chamber
It is stably maintained at Ps+ △ P；(2) tight resistance pressure cavity pressure Pb pre- lower than the pressure Ps of low pressure air suction chamber and the second control valve in
When power △ P, i.e. Pb < (Ps+ △ P), the second control valve of control is closed, so that the pressure in middle pressure chamber maintains Pb level.
It applies the technical scheme of the present invention, compared with prior art, middle pressure chamber pressure of the invention is lower, but remains to normal
Sealing.Reason is existing middle pressure technology under high pressure ratio operating condition, and since pressure of inspiration(Pi) is smaller, compression chamber is under-voltage, and contracting is serious,
Middle pressure chamber is connected to angle with compression chamber and needs to realize sealing closer to exhaust angle to improve middle pressure chamber pressure, therefore, is ensuring
Height is than the sealing under this kind of low-temperature heating operating condition, since connection angle is close to row under rated designs operating condition and High Pressure Difference operating condition
Air cavity makes middle pressure chamber pressure bigger than normal, seals that surplus is too big when so as to cause under this kind of operating condition and to bring friction power loss big etc. unfavorable
Factor.And the screw compressor of the invention patent is used then can effectively to let out under the excessive operating condition of the pressure of this kind of middle pressure chamber
Pressure, pressure release cause under safer and more effective pressure.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the partial sectional view of the first embodiment of screw compressor of the invention；
Fig. 2 diagrammatically illustrates the partial sectional view of the second embodiment of screw compressor of the invention；
Fig. 3 diagrammatically illustrates the cross-sectional view of the 3rd embodiment of screw compressor of the invention；
Fig. 4 diagrammatically illustrates the partial sectional view of the fourth embodiment of screw compressor of the invention；
Fig. 5 diagrammatically illustrates the partial sectional view of the 5th embodiment of screw compressor of the invention；
Fig. 6 diagrammatically illustrates the partial sectional view of the sixth embodiment of screw compressor of the invention；
Fig. 7 diagrammatically illustrates the partial sectional view of the 7th embodiment of screw compressor of the invention；
Fig. 8 diagrammatically illustrates the partial sectional view of the first embodiment of orbiter of the invention；
Broken section when Fig. 9 is diagrammatically illustrated on the orbiter of the first control valve installation of the invention in fig. 8
Figure；
Figure 10 diagrammatically illustrates the partial sectional view of the second embodiment of orbiter and the first control valve of the invention；
Figure 11 diagrammatically illustrates the partial sectional view of mounting bracket of the invention；
Figure 12 diagrammatically illustrates the first perspective view of the second valve seat of the invention；
Figure 13 diagrammatically illustrates the second perspective view of the second valve seat of the invention；
Figure 14 diagrammatically illustrates the application effect comparison diagram of screw compressor and existing screw compressor of the invention；
Figure 15 diagrammatically illustrates the compression chamber pressure change of existing screw compressor and the relational graph of crank angle；
Figure 16 diagrammatically illustrates the pressure in screw compressor of the invention and existing screw compressor use process and becomes
Change figure.
Wherein, the above drawings include the following reference numerals:
10, shell；11, upper cover；12, casing；20, mounting bracket；30, fixed scroll；40, orbiter；50, first connects
Connect road；51, non-return valve seat mounting hole；52, middle pressure chamber intercommunicating pore；60, the second interface channel；561, non-return valve seat mounting portion；
562, middle pressure chamber side intercommunicating pore；563, circular conical surface is sealed；564, compression chamber side intercommunicating pore；70, the first control valve；71, diaphragm seal；
72, the second valve seat；721, through-hole；722, ontology；723, outward flange；80, the second control valve；781, the first valve seat；782, elastic
Component；783, seal member；90, compression chamber；100, middle pressure chamber；110, low pressure air suction chamber；120, crankshaft；130, driving motor；
140, supplementary bearing；150, main balance weight；160, sealing gland seal；170, base bearing；180, eccentric bushing；190, bearing is driven；200,
Discharge chamber.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
Referring to shown in Fig. 1 to Figure 16, according to an embodiment of the invention, a kind of screw compressor is provided, in the present embodiment
Screw compressor include shell 10, it is fixed scroll 30, discharge chamber 200, compression chamber 90, orbiter 40, mounting bracket 20, low
Press suction chamber 110, crankshaft 120, driving motor 130, supplementary bearing 140, main balance weight 150, sealing gland seal 160, base bearing 170,
Middle pressure chamber 100, eccentric bushing 180, driving bearing 190, the first interface channel 50 and the second interface channel 60.
Wherein, shell 10 includes the upper cover 11 that casing 12 and lid are located on casing 12.It is when installation, mounting bracket 20 is fixed
It is mounted on inside shell 10；Fixed scroll 30 is mounted in mounting bracket 20；Orbiter 40 is installed in rotation on installation branch
Between frame 20 and fixed scroll 30, there is compression chamber 90, orbiter 40 and installation between orbiter 40 and fixed scroll 30
There is middle pressure chamber 100, the bottom of mounting bracket 20 and the top of fixed scroll 30 all have low pressure air suction chamber between bracket 20
110；The both ends of first interface channel 50 are connected to compression chamber 90 and middle pressure chamber 100 respectively, are provided on the first interface channel 50
First control valve 70；Company's section of second interface channel 60 is connected to middle pressure chamber 100 and low pressure air suction chamber 110 respectively, the second connection
The second control valve 80 is provided on channel 60.
Screw compressor of the invention especially Horizontal type vehicle-mounted scroll compressor structure, but feature of the present invention is still
It can be advantageously applied in traditional vertical enthalpy-increasing scroll compressor.
Shown in Figure 3, driving motor 130 is built in casing 12, and driving motor 130 drives crankshaft 120 to rotate, crankshaft
120 carry out circumferential direction and radial constraint by supplementary bearing 140 and base bearing 170, guarantee the concentricity of screw compressor shafting, crankshaft
120 driving ends drive orbiter 40 to do revolution around fixed scroll 30 and move back and forth by flexible eccentric bushing 180.Then by quiet whirlpool
Periodically increasing, which occurs, in the minimum cylinder volume that capstan 30 and orbiter 40 are constituted to be reduced, and the compression chamber 90 of compression refrigerant is formed,
To complete continuously to the refrigerant compression being inhaled into compression chamber.
Screw compressor of the invention also has structure feature as shown in Figure 1: screw compressor of the present invention
40 floating seal of orbiter of axial seal mode between the pump housing, i.e., at the back side of orbiter 40 (relative to quiet vortex
Disk) the axial gas power that middle pressure chamber 100 is used to resist the generation of 40 front compression chamber 90 of orbiter is formed, then, in dynamic vortex
The tow sides of disk 40 form contrary axial gas pressure, the pressure in middle pressure chamber 100 be in pressure at expulsion Pd and
Intermediate pressure Pb between pressure of inspiration(Pi) Ps, the pressure Pm in compression chamber 90 are the pressure that center constantly becomes larger from the outer Zhou Dynasty.It is dynamic
Orbiter 40 is tightly fitted on fixed scroll 30 by the pressure that 40 tow sides of scroll plate generate, and is realized axial between the pump housing
Sealing.
As shown in Figure 1, in order to obtain the steady pressure in middle pressure chamber 100.The present invention compression chamber 90 and middle pressure chamber 100 it
Between the first interface channel 50 is set, by compression chamber 90 pressure introduce middle pressure chamber 100, as illustrated by the arrows in fig. 1, and at this
First control valve 70 is set on first interface channel 50, gas is only allowed to flow into middle pressure chamber 100 from compression chamber 90, first control
The effect of valve 70 is so that the pressure oscillation in middle pressure chamber 100 is small, the final pressure stablized in a certain compression chamber 90.
As shown in figure 15, in which: θ 1, middle pressure chamber are connected to opening angle with compression chamber；θ 2, middle pressure chamber are connected to closing with compression chamber
Angle；P1, middle pressure chamber are connected to unlatching compression cavity pressure with compression chamber；P2, middle pressure chamber are connected to closing compression cavity pressure with compression chamber；θ,
Drive crank angle；P, cavity pressure is compressed.Y-coordinate is the pressure P in compression chamber 90 in figure, and X-axis is the corner of crankshaft 120, is used
In the connection angle of connection 90 access of compression chamber and middle pressure chamber 100 be θ 1 θ 2, the pressure of corresponding compression chamber 90 is P1 and P2, any
Directly or indirectly the pressure state of connection compression chamber 90 compression chamber 90 corresponding with the middle pressure scheme of middle pressure chamber 100 is such as Figure 15 institute
Show.It then, is as shown in figure 16 the middle pressure chamber in the use process of existing screw compressor and screw compressor of the invention
Pressure variation, in which: Pm, middle pressure chamber pressure；Realize that curve is line of buckling in feature of present invention；Dotted line is the prior art
The middle pressure curve of cyclical fluctuations, P are the pressure of compression chamber 90, the influence of compressed 90 pressure of chamber, in the pressure such as Figure 16 in middle pressure chamber 100
It is existing middle pressure scheme, by being directly or indirectly connected to compression chamber 90 and middle pressure chamber 100, corresponding connection angle shown in dotted line
Spend θ 1 under θ 2, the pressure in middle pressure chamber 100 has a cyclic fluctuation, and 100 pressure oscillation of middle pressure chamber will cause sound disk it
Between axis sealing, deficiency may be sealed in middle pressure pressure minimum, between the pump housing and cause to leak, intermediate pressure maximum
When, between the pump housing may sealing force cause friction power loss too big greatly very much.
Why 100 pressure oscillation of middle pressure chamber in existing screw compressor is big, is because of compression chamber 90 and middle pressure chamber 100
When period is connected to, in the case where starting to be connected to angle, θ 1, the pressure in compression chamber 90 is low pressure P1, at this point, the pressure in middle pressure chamber 100
Higher than the pressure of compression chamber 90, fluid, which leaks to compression chamber 90 by middle pressure chamber 100, leads to 100 pressure reduction of middle pressure chamber, with
The continuous compression of compression chamber 90, pressure are gradually increasing, and fluid is leaked towards middle pressure chamber 100 when rising above 100 pressure of middle pressure chamber,
Then 100 pressure of middle pressure chamber constantly rises, middle pressure chamber 100 be connected to compression chamber 90 terminate before reach maximum, then compression chamber
90 are connected to closing with middle pressure chamber 100, subsequently enter next connection period, and the period is back and forth as shown in figure 16.Such as solid line in Figure 16
Shown, the pressure for the middle pressure chamber 100 of scroll compression shrinkage cavity of the invention is basically stable at by the effect of the first control valve 70
Under the premise of the connection angle and mode of one stationary value, compression chamber 90 and middle pressure chamber 100 are constant, middle pressure chamber 100 is lower in connection
When the pressure of compression chamber 90,90 pressure of compression chamber is lower, and 100 pressure of middle pressure chamber is big, but due to the effect of the first control valve 70,
There is no middle pressure chambers 100 to leak to compression chamber 90, and the pressure being then able to maintain in middle pressure chamber 100 remains at certain pressure
It is horizontal.
As shown in Figure 1, in the first embodiment of the present invention, the first interface channel 50 is arranged on orbiter 40,
And make the second interface channel 60 that mounting bracket 20 be set and be connected to the bottom low pressure air suction chamber 110 of mounting bracket 20.Such as
Only allow fluid to circulate in Fig. 1 from middle pressure chamber 100 to low pressure air suction chamber 110 shown in arrow and there is certain preload resistance, i.e.,
Second interface channel 60 only should when the pressure Ps for being higher than low pressure air suction chamber 110 of the pressure Pb in middle pressure chamber 100 is destined to
Second interface channel 60 could be opened, and prevent fluid countercurrent current to the compression chamber 90 in middle pressure chamber 100 from causing middle pressure chamber 100 and compression
Pressure oscillation in chamber 90 enables the pressure maximum in middle pressure chamber 100 to stablize and is being connected to a certain pressure before terminating with compression chamber 90
Power Pb (Pb is slightly below Pm) then passes through the first control valve 70, the second control valve 80,90 pressure Pm of compression chamber, low pressure air suction chamber
Under the common adjusting control of the preload resistance △ P of 110 pressure Ps and the second control valve 80: 1, when 100 pressure Pb of middle pressure chamber is big
In low pressure air suction chamber 110 pressure Ps and the second control valve 80 preload resistance △ P when, i.e. Pb > (Ps+ △ P), control second control
Valve 80 processed is opened, and fluid leaks to low pressure air suction chamber 110 in middle pressure chamber 100, is finally stablized the pressure in middle pressure chamber 100 and is maintained
At Ps+ △ P (circulating resistance for ignoring access herein)；2, when 100 pressure Pb of middle pressure chamber is lower than the pressure Ps of low pressure air suction chamber 110
When with the preload resistance △ P of the second control valve 80, i.e. Pb < (Ps+ △ P), the second control valve 80 of control is closed, in middle pressure chamber 100
Pressure maintain Pb level.
Then, the pressure of the middle pressure chamber 100 in the actual operating mode of entire scroll compressor compresses can be in different
Stress level, as shown in figure 14, the region in figure with oblique line indicate the application effect of existing screw compressor, without oblique line
Region indicate the application effect of screw compressor of the invention, P1 is that compression chamber 90 is connected to pressure；△ P, the second control valve 80
Preload resistance, compared with prior art, 100 pressure of middle pressure chamber of the invention is lower, but remains to normally seal.Reason is existing
The middle pressure technology having is under high pressure ratio operating condition, and since pressure of inspiration(Pi) is smaller, compression chamber 90 is under-voltage, and contracting is serious, middle pressure chamber 100 and pressure
Contracting chamber 90 is connected to angle and needs to realize sealing closer to exhaust angle to improve 100 pressure of middle pressure chamber, therefore, is ensuring height ratio
Made due to connection angle close to discharge chamber under sealing under this kind of low-temperature heating operating condition, rated designs operating condition and High Pressure Difference operating condition
Middle pressure chamber pressure is bigger than normal, seal that surplus is too big when so as to cause under this kind of operating condition and the unfavorable factors such as bring friction power loss big.
And use the invention patent screw compressor then can effective pressure release under the excessive operating condition of the pressure of this kind of middle pressure chamber 100,
Pressure release causes under safer and more effective pressure.
Preferably, the first control valve 70 in the present embodiment is the first one way stop peturn valve, the stream of first one way stop peturn valve
Logical direction is from compression chamber 90 to middle pressure chamber 100.Second control valve 80 is the second one way stop peturn valve, the stream of the second one way stop peturn valve
Logical direction is from middle pressure chamber 100 to low pressure air suction chamber 110.
Shown in Figure 2, second embodiment according to the present invention provides a kind of screw compressor, in the present embodiment
Screw compressor and first embodiment it is essentially identical, the difference is that the second interface channel 60 in the present embodiment is along installation
Bracket 20 and fixed scroll 30 extend and are connected to the top low pressure air suction chamber 110 of fixed scroll 30, rather than and mounting bracket
The low pressure air suction chamber 110 of 20 bottom is connected to.As shown in Fig. 2, 30 back side of fixed scroll forms exhaust high pressure chest Pd and low pressure is inhaled
Air cavity Ps can use low pressure air suction chamber 110 and middle pressure chamber 100 adjusting at this and form suitable intermediate pressure.Specifically, such as
Pass through installation branch between low pressure air suction chamber 110 at the top of the structure of Fig. 5 and Fig. 6, compression chamber 90 of the invention and fixed scroll 30
Frame 20 is connected to the second interface channel 60 on fixed scroll 30, and the second control valve 80 with non-return characteristic may be provided at quiet whirlpool
In the second interface channel 60 on capstan 30, as shown in Figure 5.The second interface channel 60 in mounting bracket 20 can be set again
It is interior, as shown in Figure 6.
Shown in Figure 3, the second interface channel 60 of screw compressor is also disposed at mounting bracket 20 and and mounting bracket
20 bottom low pressure air suction chamber 110 is connected to.
It is illustrated in figure 4 the partial sectional view of the fourth embodiment of the application, in the present embodiment the first interface channel 50
Across the connection compression chamber 90 and middle pressure chamber 100 of orbiter 40, the first control valve is provided on first interface channel 50
70, the low pressure air suction of the second interface channel 60 connection middle pressure chamber 100 and 20 bottom of mounting bracket is offered in mounting bracket 20
Chamber 110 is provided with the second control valve 80 on second interface channel 60.Referring to shown in Fig. 8 and Fig. 9, in the present invention first
Interface channel 50 includes that non-return valve seat mounting portion 561, middle pressure chamber side intercommunicating pore 562, sealing circular conical surface 563 and compression chamber side connect
Through-hole 564, sealing circular conical surface 563 are located at non-return valve seat mounting portion 561 close to 562 end of middle pressure chamber side intercommunicating pore, compression chamber side
Intercommunicating pore 564 is the groove positioned at 561 side wall of non-return valve seat mounting portion；First control valve 70 includes the first valve seat 781, elastic portion
Part 782 and seal member 783, seal member 783 are mounted at sealing circular conical surface 563, and the first valve seat 781 is mounted on check-valves
In seat mounting portion 561, the both ends of elastomeric element 782 are supported respectively between the first valve seat 781 and seal member 783, and compression is worked as
When pressure in chamber 90 reaches certain value, seal member 783 opens middle pressure chamber side intercommunicating pore 562, the fluid in compression chamber 90
It enters in middle pressure chamber 100.First is controlled by the secure fit between the first valve seat 781 and non-return valve seat mounting portion 561
The installation of valve 70 is fixed, and the sealing between access utilizes seal member 783, i.e., seals between steel ball structure and sealing circular conical surface 563,
And seal member 783 is fitted on sealing circular conical surface 563 by elastomeric element 782, under normal assembled state, elastomeric element
782 press lightly on seal member 783 on sealing circular conical surface 563, the seal preload with very little.In seal member 783
When not being fitted on sealing circular conical surface 563, fluid can be connected by middle pressure chamber side intercommunicating pore 562 and compression chamber side intercommunicating pore 564
Logical compression chamber 90 and middle pressure chamber 100.
Shown in Figure 10, the first interface channel 50 includes non-return valve seat mounting hole in another embodiment of the invention
51 and middle pressure chamber intercommunicating pore 52；First control valve 70 includes diaphragm seal 71 and the second valve seat 72, and diaphragm seal 71 is located at the second valve seat
72 bottom is provided with through-hole 721 on the second valve seat 72, and when the pressure in compression chamber 90 reaches certain value, diaphragm seal 71 will
The opening of through-hole 721 is provided on second valve seat 72, the fluid in compression chamber 90 enters in middle pressure chamber 100.Referring to Figure 12 and figure
Shown in 13, the second valve seat 72 in the present embodiment includes ontology 722 and the outward flange 723 that 722 periphery of ontology is arranged in, installation
When, diaphragm seal 71 is located at the inside of outward flange 723, and above-mentioned through-hole 721 is provided on ontology 722.Second valve seat 72 is in diaphragm seal
When 71 opening, fluid can be passed through by diaphragm seal 71 and middle pressure chamber intercommunicating pore 52.
As shown in figure 11, the second interface channel 60 in the present invention also includes non-return valve seat mounting portion 561, middle pressure chamber side company
Through-hole 562, sealing circular conical surface 563 and compression chamber side intercommunicating pore 564, sealing circular conical surface 563 are located at non-return valve seat mounting portion 561
Close to 562 end of middle pressure chamber side intercommunicating pore, compression chamber side intercommunicating pore 564 is the groove positioned at 561 side wall of non-return valve seat mounting portion；
Second control valve 80 includes the first valve seat 781, elastomeric element 782 and seal member 783, and seal member 783 is mounted on sealing
At circular conical surface 563, the first valve seat 781 is mounted in non-return valve seat mounting portion 561, and the both ends of elastomeric element 782 are supported respectively
Between first valve seat 781 and seal member 783.By in mounting bracket 20 the second interface channel of the company of opening up 60 for be connected to peace
Outside in bracket 20 is filled, is provided with the second control valve 80, the middle pressure chamber 100 in mounting bracket 20 on the second interface channel 60
Fluid can only flow to the low pressure air suction chamber 110 outside mounting bracket 20.Compared to the first one way stop peturn valve, the second reverse check valve
Elastomeric element 782 under natural assembled state its with certain pretightning force be that the spring in figure such as has been in certain compression
State tightly presses round steel ball on sealing circular conical surface 563.
It is shown in Figure 7, in another preferred embodiment of the invention, flap valve piece is set by the second control valve 80
One way stop peturn valve.When design, flap valve piece one-way check valve designs are at certain preload amount.If Figure 11 is to as shown in figure 13,
The preload amount of elastomeric element 782 in the application is to control the key factor of middle pressure chamber pressure, according to middle pressure chamber 100 and compression chamber
90 connection angular dimension, the early warning pressure on elastomeric element 782 are generally located within the scope of 0.3~0.8MPA.
According to another aspect of the present invention, a kind of air conditioner, including screw compressor are provided, screw compressor is above-mentioned
Screw compressor in embodiment.
In accordance with a further aspect of the present invention, a kind of backpressure regulation method of screw compressor is provided, screw compressor
Backpressure regulation method realizes that the backpressure regulation method of screw compressor includes: using above-mentioned screw compressor
When the pressure Pb in middle pressure chamber 100 is higher than the pressure Ps predetermined value of low pressure air suction chamber 110, the first interface channel 50
On the first control valve 70 open, prevent fluid countercurrent current to the compression chamber 90 in middle pressure chamber 100 from causing middle pressure chamber 100 and compression chamber
Pressure oscillation in 90 enables the pressure maximum in middle pressure chamber 100 to stablize and is being connected to a certain pressure before terminating with compression chamber 90
Pb, then, by the first control valve 70, the second control valve 80,90 pressure Pm of compression chamber, 110 pressure Ps of low pressure air suction chamber and
The common adjusting control of the preload resistance △ P of second control valve 80 is lower to realize following control: 1, when 100 pressure Pb of middle pressure chamber is greater than
When the preload resistance △ P of the pressure Ps of low pressure air suction chamber 110 and the second control valve 80, i.e. Pb > (Ps+ △ P), the second control of control
Valve 80 is opened, and fluid leaks to low pressure air suction chamber 110 in middle pressure chamber 100, is finally stably maintained at the pressure in middle pressure chamber 100
Ps+△P；3, when 100 pressure Pb of middle pressure chamber is lower than the pressure Ps of low pressure air suction chamber 110 and the preload resistance △ of the second control valve 80
When P, i.e. Pb < (Ps+ △ P), the second control valve 80 of control is closed, so that the pressure in middle pressure chamber 100 maintains Pb level.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements: the present invention is logical
It crosses and one-way non-return structure is being set close to intermediate pressure cavity side, only allow fluid to flow to intermediate cavity from compression chamber, and fluid is logical
There is lesser circulation loss when crossing the non-return structure；Being connected to for intermediate pressure cavity and stent outer low pressure chamber is connected in the present invention
Mode is the through-hole being directly provided on bracket, and one-way non-return structure is provided in through-hole, only allows fluid from intermediate pressure
Chamber circulates to low-pressure side, and is provided with certain preload pressure, when the intermediate pressure of non-return structure side is greater than the low of the other side
When pressure pressure+preload pressure, intermediate cavity is just connected to suction chamber；Intermediate pressure cavity and upper cover periphery low pressure chamber in the present invention
Mode of communicating is the connection through-hole being provided on bracket and quiet disk, and one-way non-return structure is provided in through-hole, only allows fluid
It circulates from intermediate pressure cavity to low-pressure side, and is provided with certain preload pressure, when the intermediate pressure of non-return structure side is greater than
When low pressure+preload pressure of the other side, intermediate cavity is just connected to low pressure chamber.
Screw compressor backpressure regulation structure of the invention is basically stable at the pressure that back pressure is intracavitary under same operating
Phase same level, pump housing sealing is more reliable, promotes compressor performance.And under different operating conditions, backpressure regulation knot through the invention
Structure, compressor pump compression chamber can obtain of substantially equal sealing surplus, and pump housing sealing is more reliable, and the operating condition for promoting compressor is suitable
Ying Xing is promoted compressor entirety efficiency (APF efficiency).
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to herein
Sequence other than those of diagram or description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Be to cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units not
Those of be necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for these processes, side
The intrinsic other step or units of method, product or equipment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of screw compressor characterized by comprising
Shell (10)；
Mounting bracket (20), it is internal that the mounting bracket (20) is fixedly mounted on the shell (10)；
Fixed scroll (30), the fixed scroll (30) are mounted on the mounting bracket (20)；
Orbiter (40), the orbiter (40) are installed in rotation on the mounting bracket (20) and the fixed scroll
(30) between, there are compression chamber (90) between the orbiter (40) and the fixed scroll (30), the orbiter
(40) there are middle pressure chamber (100) between the mounting bracket (20), the bottom and the quiet whirlpool of the mounting bracket (20)
Low pressure air suction chamber (110) are all had at the top of capstan (30)；
First interface channel (50), the both ends of first interface channel (50) respectively with the compression chamber (90) and medium pressure
Chamber (100) is connected to, and is provided with the first control valve (70) on first interface channel (50)；
Second interface channel (60), the both ends of second interface channel (60) respectively with medium pressure chamber (100) and described low
Suction chamber (110) connection is pressed, is provided with the second control valve (80) on second interface channel (60).
2. screw compressor according to claim 1, which is characterized in that first interface channel (50) is arranged described
On orbiter (40).
3. screw compressor according to claim 1, which is characterized in that second interface channel (60) is arranged described
It is connected in mounting bracket (20) and with the low pressure air suction chamber (110) of the mounting bracket (20) bottom.
4. screw compressor according to claim 1, which is characterized in that second interface channel (60) is along the installation
Bracket (20) and the fixed scroll (30) extend and connect with the low pressure air suction chamber (110) at the top of the fixed scroll (30)
It is logical.
5. screw compressor according to claim 1, which is characterized in that first control valve (70) is unidirectionally stopped for first
Valve is returned, the circulating direction of first one way stop peturn valve is from the compression chamber (90) to medium pressure chamber (100).
6. screw compressor according to claim 1, which is characterized in that second control valve (80) is unidirectionally stopped for second
Valve is returned, the circulating direction of second one way stop peturn valve is from medium pressure chamber (100) to the low pressure air suction chamber (110).
7. screw compressor according to claim 1, which is characterized in that first interface channel (50) and described second
Interface channel (60) include non-return valve seat mounting portion (561), middle pressure chamber side intercommunicating pore (562), sealing circular conical surface (563) and
Compression chamber side intercommunicating pore (564), the sealing circular conical surface (563) are located at the non-return valve seat mounting portion (561) in described
Chamber side intercommunicating pore (562) end is pressed, compression chamber side intercommunicating pore (564) is positioned at non-return valve seat mounting portion (561) side
The groove of wall；
First control valve (70) and second control valve (80) include the first valve seat (781), elastomeric element (782) with
And seal member (783), the seal member (783) are mounted at the sealing circular conical surface (563), first valve seat
(781) it is mounted in the non-return valve seat mounting portion (561), the both ends of the elastomeric element (782) are supported respectively described the
Between one valve seat (781) and the seal member (783).
8. screw compressor according to claim 1, which is characterized in that first interface channel (50) includes check-valves
Seat mounting hole (51) and middle pressure chamber intercommunicating pore (52)；
First control valve (70) includes diaphragm seal (71) and the second valve seat (72), and the diaphragm seal (71) is located at described second
The bottom of valve seat (72) is provided with through-hole (721) on second valve seat (72).
9. screw compressor according to claim 8, which is characterized in that second valve seat (72) includes ontology (722)
Outward flange (723) with setting in the ontology (722) periphery, the diaphragm seal (71) are located at the interior of the outward flange (723)
Portion is provided with the through-hole (721) on the ontology (722).
10. screw compressor according to claim 1, which is characterized in that second control valve (80) is flap valve piece list
To check-valves.
11. a kind of air conditioner, including screw compressor, which is characterized in that the screw compressor is to appoint in claims 1 to 10
Screw compressor described in one.
12. a kind of backpressure regulation method of screw compressor, which is characterized in that the backpressure regulation method of the screw compressor is adopted
The screw compressor described in any one of claims 1 to 10 realizes that the backpressure regulation method of the screw compressor includes:
When the pressure Pb in middle pressure chamber (100) is higher than the pressure Ps predetermined value of low pressure air suction chamber (110), the first interface channel
(50) the first control valve (70) on is opened, and prevents fluid countercurrent current to the compression chamber (90) in middle pressure chamber (100) from causing middle pressure chamber
(100) and the pressure oscillation in compression chamber (90), enable the pressure maximum of middle pressure chamber (100) interior fluid stablize with compression chamber
(90) a certain pressure Pb before connection terminates, passes through the first control valve (70), the second control valve (80), compression chamber (90) pressure
Common the adjustings control of the preload resistance △ P of Pm, low pressure air suction chamber (110) pressure Ps and the second control valve (80) descend realization with
Lower control:
(1) when middle pressure chamber (100) pressure Pb is greater than the preload resistance of the pressure Ps and the second control valve (80) of low pressure air suction chamber (110)
When power △ P, i.e. Pb > (Ps+ △ P), control the second control valve (80) is opened, and middle pressure chamber (100) interior fluid leaks to low pressure air suction
Chamber (110) finally makes the pressure in middle pressure chamber (100) be stably maintained at Ps+ △ P；
(2) the tight resistance pre- lower than the pressure Ps and the second control valve (80) of low pressure air suction chamber (110) as middle pressure chamber (100) pressure Pb
When power △ P, i.e. Pb < (Ps+ △ P), control the second control valve (80) is closed, so that the pressure in middle pressure chamber (100) maintains Pb
It is horizontal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545156.2A CN109654016A (en) | 2018-12-17 | 2018-12-17 | Screw compressor, air conditioner and screw compressor backpressure regulation method |
| PCT/CN2019/103955 WO2020125064A1 (en) | 2018-12-17 | 2019-09-02 | Scroll compressor, air conditioner, and backpressure adjustment method for scroll compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811545156.2A CN109654016A (en) | 2018-12-17 | 2018-12-17 | Screw compressor, air conditioner and screw compressor backpressure regulation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109654016A true CN109654016A (en) | 2019-04-19 |
Family
ID=66114721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811545156.2A Pending CN109654016A (en) | 2018-12-17 | 2018-12-17 | Screw compressor, air conditioner and screw compressor backpressure regulation method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109654016A (en) |
| WO (1) | WO2020125064A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020125064A1 (en) * | 2018-12-17 | 2020-06-25 | 珠海格力节能环保制冷技术研究中心有限公司 | Scroll compressor, air conditioner, and backpressure adjustment method for scroll compressor |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020125064A1 (en) | 2020-06-25 |
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