CN109026162B - A kind of screw expansion (compression) machine with variable volume ratio - Google Patents
A kind of screw expansion (compression) machine with variable volume ratio Download PDFInfo
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- CN109026162B CN109026162B CN201810781865.4A CN201810781865A CN109026162B CN 109026162 B CN109026162 B CN 109026162B CN 201810781865 A CN201810781865 A CN 201810781865A CN 109026162 B CN109026162 B CN 109026162B
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- spool
- end cap
- air inlet
- hole
- driving lever
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
- F01C20/24—Control of, monitoring of, or safety arrangements for, machines or engines characterised by using valves for controlling pressure or flow rate, e.g. discharge valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/08—Rotary pistons
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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
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- 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
-
- 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
- F04C2240/00—Components
- F04C2240/20—Rotors
Abstract
The invention discloses a kind of screw expansion (compression) machine with variable volume ratio, including cabinet (300), upper supports end cap (400), air inlet end cap (500) and spool cover board (600)；Upper supports end cap (400) is fixedly connected with cabinet (300), forms a closed cavity (408)；Air inlet end cap (500) and spool cover board (600) are all set in the cavity (408)；Spool cover board (600) is set to the lower section of air inlet end cap (500)；Screw expander further includes main drive shaft arranged in parallel (401), adjusts operating stick (402) and driven shaft (403)；Screw expander further includes an air inlet regulating mechanism being set in cavity (408), which includes half gear cam (700), adjustment gear (800), valve spool driving lever (900), radially slides spool (603) and circumferential sliding valve core (604).Screw expansion (compression) machine has adjustable built-in volumetric ratio, can keep the best match of built-in volumetric ratio and running pressure ratio to greatest extent, improves overall operation efficiency of the screw expander under variable parameter operation.
Description
Technical field
The invention belongs to the utilizations of the energy and transformation technology field, more particularly, to a kind of screw rod with variable volume ratio
Expand (compression) machine.
Background technique
As the mankind are to consciousness enhancing that is energy saving, reducing discharge and utilize to low-grade energy, to geothermal energy resources
Exploitation, industrial waste heat utilize, biomass energy converts and the exploitation of solar energy, wind energy energy storage technology is converted etc., so that being based on youth
The demand for agreeing the middle-size and small-size heating power dynamic power machine of circulation also increasingly increases.
The heating power engine of middle and small scale, mostly based on positive-displacement expansion engine, including the expansion of twin-screw expander, single screw rod
Machine, scroll expansion machine, sliding vane type expander, rotary-piston type expanding machine etc..Wherein, in the thermal energy of 100kW or more scale
It is in the majority with twin-screw expander in utilization.However, all kinds of positive-displacement expansion engines have a common trait, i.e., since positive displacement is swollen
The built-in cubical expansion ratio of swollen machine is according to its geometric volume than determining, therefore its built-in volume determined by geometrical characteristic is swollen
It is swollen than being typically also fixed, uncontrollable.Resulting problem is, when the operation pressure of the system using positive-displacement expansion engine
When power ratio changes, operating pressure can be generated than the built-in cubical expansion with expanding machine than unmatched situation, generation " owes swollen
It is swollen " or " cross and expand " phenomenon, cause " undershoot " or " recoil " of working medium, causes additional thermodynamic loss, make script efficiency not
High expanding machine increases additional loss in efficiency.If swelling state is being crossed in expanding machine work, due to there is " recoil " phenomenon, meeting
The hurried decline of generation efficiency, will lead to operating system unstability when serious, it is difficult to which control restores stable operation.Therefore for safety,
It often enables system operate in deficient swelling state (i.e. the pressure ratio of system is greater than expansion pressure ratio built in expanding machine), there is working medium few
" undershoot " of amount.Thus bring cost is that expansion process exists because of expanding machine off-target matching status additional always
Thermodynamic loss.
Further, since the built-in cubical expansion of positive-displacement expansion engine is by the geometry of rotatable parts than being determined mostly,
Therefore the positive-displacement expansion engine of specific built-in cubical expansion ratio generally also specially designs its rotatable parts, and customization processing is corresponding
Components cause expanding machine manufacturing cost higher.Especially when needing cubical expansion ratio built in height, the cubical expansion as built in height
The expanding machine manufacture of ratio is more difficult, some heat energy recycling systems have to select the expanding machine of low built-in cubical expansion ratio
Series connection thereby results in heating power recycling and development system equipment manufacturing cost is excessively high to realize multiple expansion.In addition, due to low built-in volume
The limitation of expansion ratio, many low grade heat energy conversion development systems can only select organic working medium as thermal energy conversion medium, not only
Price is high, and often inflammable and explosive, or containing toxic, or has potential threat to atmospheric warming effect, also due to organic working medium
Usually only lower specific heat capacity needs the more pump work consumptions of bigger liquid mass flow, consumption in therrmodynamic system, causes
Circulation system net power is reduced, and system effectiveness is lower.
Low-grade, variable working condition heat energy utilization exploit condition needs a kind of adjustable built-in cubical expansion of energy offer
The expanding machine of ratio obtains higher transfer efficiency with the operation for the real-time best match of heat source condition realized and changed, while
The expanding machine for needing to produce higher built-in cubical expansion ratio with lower cost, can use low-grade thermodynamic conversion system honest and clean
Valence, safer, more environmentally friendly high specific heat capacity working medium (such as water), enable the geothermal energy resources recycling of low (temperature) grade, Waste Heat Reuse,
Biomass energy exploitation, solar wind-energy heat-storage technology, which utilize etc., has higher efficiency and more inexpensive.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of screw expansion (compression) machine with variable volume ratio.
In order to solve the above technical problems, invention adopts the following technical scheme that:
The present invention provides a kind of screw expander with variable volume ratio, including cabinet, upper supports end cap, air inlet end cap
With spool cover board；
Upper supports end cap is fixedly connected with cabinet, forms a closed cavity；Air inlet end cap and spool cover board are all set to
In the cavity；Spool cover board is set to the lower section of air inlet end cap；
The screw expander further includes main drive shaft arranged in parallel, adjusts operating stick and driven shaft, and main
The central axis of drive shaft, adjusting operating stick and driven shaft is all perpendicular with upper supports end cap；
The screw expander further includes an air inlet regulating mechanism being set in cavity, the air inlet regulating mechanism packet
It includes half gear cam, adjustment gear, valve spool driving lever, radially slide spool and circumferential sliding valve core；
Half gear cam, adjustment gear and valve spool driving lever are all set to the top of air inlet end cap；
Half gear cam is an incomplete circular gear；Half gear cam be set to supports end cap and air inlet end cap it
Between, and half gear cam is set on main drive shaft by its centre bore, and half gear cam is turned around main drive shaft
It is dynamic；The lower surface of half gear cam is provided with the first inclined platform, and the one side of the first inclined platform is inclined-plane；
Adjustment gear is set between supports end cap and air inlet end cap, and adjustment gear is set in by its centre bore
It adjusts in operating stick, so that adjusting operating stick is able to drive adjustment gear rotation；
It is connected in such a way that gear engages between adjustment gear and half gear cam, so that adjustment gear is able to drive half
Pinion cam turns；
The upper surface of air inlet end cap is fixedly installed driving lever hinged shaft and the second inclined platform, and the one side of the second inclined platform is oblique
Face, and the inclined-plane that the inclined-plane of the second inclined platform is equal to the first inclined platform relative to the tilt angle of inlet end cap upper surface is opposite
Tilt angle in half gear cam lower surface；
Valve spool driving lever is integrally L-shaped；The short side end of valve spool driving lever and the cam surface of half gear cam are oppositely arranged and two
Person is not in contact with when the short side end of half pinion cam turns to valve spool driving lever is in contact with the cam surface of half gear cam, partly
Gear cam can push valve spool driving lever to rotate around driving lever hinged shaft；The long side end of valve spool driving lever is provided with the first pilot hole,
The corner of valve spool driving lever is provided with hinge axis hole；
Perforation spool cover board is provided on spool cover board and arc-shaped the first spool sliding slot and the second spool sliding slot, and
First spool sliding slot is centered on driving lever hinged shaft, and the second spool sliding slot is centered on main drive shaft；The inner end of first spool sliding slot
It is connected with one end of the second spool sliding slot；
It radially slides spool to be set in the first spool sliding slot, and can be slided along the first spool sliding slot；Circumferential sliding
Spool is set in the second spool sliding slot, and can be slided along the second spool sliding slot；First spool sliding slot is not slided radially
The closed part of movable valve plug forms air inlet with not being interconnected by the closed part of circumferential sliding valve core for the second spool sliding slot；
The upper surface for radially sliding spool is fixedly installed the first guide rod straight up；The upper table of circumferential sliding valve core
Face is fixedly installed the second guide rod straight up；Second guide rod is in sloping platform shape, and end face is rounded thereon, and lower end surface is in
Ellipse, one side is the inclined-plane that the upper surface of sliding valve core with respect to the circumferential direction is obliquely installed, and the inclined-plane is with respect to the circumferential direction
The tilt angle of sliding valve core upper surface is equal to tilt angle of the inclined-plane of the second inclined platform relative to inlet end cap upper surface；
Inlet end, which covers, is provided with arc-shaped the first arc-shaped slot and the second arc-shaped slot, and the first arc-shaped slot
Position is corresponding with the first spool sliding slot, and the position of the second arc-shaped slot is corresponding with the second spool sliding slot；
First guide rod is passed through and the first arc-shaped slot and is installed in the first pilot hole, enables valve spool driving lever by the
The drive of one guide rod radially slides spool and slides along the first spool sliding slot；Driving lever hinged shaft is set in hinge axis hole, so that spool
Driving lever can be rotated by axis of driving lever hinged shaft；
The lower surface of half gear cam is provided with one second pilot hole, and the shape and size of the second pilot hole are with second
Guide rod matches；Second guide rod is installed in the second pilot hole, and half gear cam is enabled to pass through the second guide rod band
Dynamic circumferential direction sliding valve core is slided along the second spool sliding slot.
Preferably, the screw expander further includes setting positive screw rod and female screw in the cavity, and positive screw rod
It is intermeshed with female screw, so that positive screw rod is able to drive female screw rotation.
Preferably, the inlet end, which covers, is provided with first through hole, the second through-hole and third through-hole, and the second through-hole and
Third through-hole is located at the two sides of first through hole；Fourth hole and fifth hole, and the 4th are provided on the spool cover board
The position of through-hole and the position of first through hole are corresponding, and the position of fifth hole is corresponding with the position of the second through-hole；The master
Drive shaft is connect by the first spring bearing with the upper supports end cap so that the main drive shaft the upper supports end cap with
It can be freely rotated around center axis thereof under the support of first spring bearing；The lower end of the main drive shaft sequentially pass through it is described into
Upper end after the fourth hole in first through hole and the spool cover board on gas end cap with the positive screw rod is fixedly connected as one
Body；The upper end for adjusting operating stick is connect by the second spring bearing with the upper supports end cap, the adjusting operating stick
Lower end is connect by the 4th spring bearing with the cabinet after passing through the third through-hole that the inlet end covers, so that the adjusting
Operating stick can be freely rotated around center axis thereof；The upper end of the driven shaft passes through third spring bearing and the upper support end
Lid connection, so that the driven shaft can be around center axis thereof certainly under the support of the upper supports end cap and third spring bearing
By rotating；The lower end of the driven shaft sequentially passes through the 5th on the second through-hole that the inlet end covers and the spool cover board
Upper end after through-hole with the female screw is connected to one.
Preferably, the adjustment gear is set in the adjusting operating stick in such a way that pin key locks, so that described
It adjusts operating stick and is able to drive the adjustment gear rotation.
Preferably, the cross section right angle ladder with a narrow upper and lower width for radially sliding spool and the circumferential sliding valve core
Shape；The shape and size of the first spool sliding slot are all set to match with the spool that radially slides；Second valve
The shape and size of core sliding slot are all set to match with the circumferential sliding valve core.
Preferably, the width of first arc-shaped slot is less than the width for radially sliding spool upper surface；Described
The width of two arc-shaped slots is less than the width of the circumferential sliding valve core upper surface.
Preferably, the driving lever hinged shaft is set to the outside of second arc-shaped slot；The outer peripheral surface of the driving lever hinged shaft
On be set with torque spring；The lower end of torque spring is fixed or is supported on the driving lever hinged shaft, or fixes or be supported in institute
It states inlet end to cover, the upper end of torque spring is fixed or is supported on the valve spool driving lever, and the torque effect of torque spring
So that the long edge tail of the valve spool driving lever is intended to the direction movement far from the main drive shaft.
Preferably, be set with holddown spring on the main drive shaft, and holddown spring be located at the upper supports end cap with
Between half gear cam, for making it fit in the upper surface of the air inlet end cap half gear cam compression.
Preferably, the main drive shaft is connect by the first seal member with the upper supports end cap, the adjusting operation
Bar is connect by the second seal member with the upper supports end cap, and the driven shaft passes through third seal member and the upper support
End cap connection, to realize the main drive shaft, the adjusting operating stick and the driven shaft three and the upper supports end cap
Between sealing.
Preferably, the screw expander further includes controller；The upper end for adjusting operating stick passes through the upper support
It is connect after end cap with controller；Controller provides torque and be able to drive to the adjusting operating stick adjusts operating stick rotation.
Any range documented by the present invention includes any numerical value between end value and end value and end value or end value
Between any subrange for being constituted of any number.
Unless otherwise specified, each raw material in the present invention can be obtained by commercially available purchase, equipment used in the present invention
The conventional equipment in fields can be used or carried out referring to the prior art of fields.
Compared with prior art, the invention has the following beneficial effects:
(1) screw expansion (compression) machine provided by the invention has adjustable built-in volumetric ratio, can not change sun
In the case where screw rod and female screw, higher built-in volumetric ratio is obtained.On the one hand, this screw expander can work in operating condition
In the great thermal energy recycling of luffing and conversion system, built-in volumetric ratio and running pressure ratio are kept to greatest extent most
Good matching reduces the thermodynamics irreversible loss generated due to the mismatch of expansion-pressure ratio, improves screw expander and transports in variable working condition
Overall operation efficiency under row；On the other hand, this screw expander can not change the key such as positive screw rod and female screw zero
In the case where component geometry size and line style, by improving the built-in volumetric ratio of screw expander from external adjustment, so as to
Simplify the configuration of Special precision tooling grinding tool in processing and manufacturing, and then can effectively reduce the manufacturing cost of screw expander.
(2) the built-in volumetric ratio of screw expansion (compression) machine provided by the invention is adjustable in the range of 2 to 20, Ke Yiyou
Effect reduces screw expander and exports lack of gas pressure, can also make it possible that screw expander selects the working medium of high expansion rate, there is item
Part is in the rankine cycle that low grade heat energy utilizes, using with high specific heat capacity, nontoxic, non-detonating security risk and atmospheric greenhouse
The working medium (such as water) of effect hidden danger is more advantageous to and reduces cycle fluid pump work consumption, improves system net power output, lifting system
Efficiency.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing
Fig. 1 be screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio cavity volume V and
The relation curve schematic diagram of positive screw rod rotational angle theta；
Fig. 2 is the axial direction of the air inlet of screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio
Perspective view；
Fig. 3 is the section circumferentially of screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio
Schematic diagram；
Fig. 4 is the diagrammatic cross-section of screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio；
Fig. 5 is that the air inlet of screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio adjusts machine
The stereoscopic schematic diagram of structure；
Fig. 6 be screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio shown in fig. 5 into
The partial enlarged view of port regulating mechanism；
Fig. 7 be screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio schematic top plan view it
One (aperture of air inlet is minimum)；
Fig. 8 be screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio schematic top plan view it
Two (aperture of air inlet is maximum)；
Fig. 9 is the circumferential sliding valve core of screw expansion (compression) machine provided in an embodiment of the present invention with variable volume ratio
With the cross-sectional view for radially sliding spool.
Specific embodiment
In order to illustrate more clearly of the present invention, below with reference to preferred embodiment, the present invention is described further.Ability
Field technique personnel should be appreciated that following specifically described content is illustrative and be not restrictive, this should not be limited with this
The protection scope of invention.
By the working principle of screw expander it is found that the cavity volume V between the screw rod screw thread of screw expander is positive screw rod
The function V (θ) of rotational angle theta, as shown in Figure 1, screw rod square cavity is successively after charging stage, expansion rank in positive screw rod rotary course
Section, exhaust phase.Wherein, when being expansion start when air inlet ends, at this point, envelope is truncated by the screw thread section of positive screw rod in air inlet
It closes.The characteristics of according to screw expander, as shown in Figure 1, at the beginning of initial stage charging stage and latter stage expansion stage and exhaust phase
Phase and exhaust phase latter stage are in non-linear relation between cavity volume V (θ) and positive screw rod rotational angle theta, big in addition to this remaining
Partial period, it is approximate in a linear relationship between cavity volume V (θ) and positive screw rod rotational angle theta.
The built-in cubical expansion ratio R of expanding machineVEqual to expansion end of a period volume V2With expansion original volume V1Ratio, i.e.,
In formula (1), RVIndicate built-in cubical expansion ratio；V2Indicate expansion end of a period volume；V1Indicate expansion original volume.
Due in a linear relationship between charging stage and expansion stage, cavity volume V (θ) and positive screw rod rotational angle theta, because
This, as shown in Figure 1, fulfiling intake process ahead of schedule if can be shortened the charging stage, air inlet end of a period line will be moved to left, so that it may reduce
Expand original volume V1, in expansion end of a period volume V2In the case where constant, so that it may obtain bigger built-in cubical expansion ratio RV。
Fig. 2 is the axis projection schematic diagram of the air inlet of screw expander.As shown in Fig. 2, R in figurewIt is the spiral shell of positive screw rod
Tooth radius of addendum, rwIt is the screw thread root radius of positive screw rod, θλBe positive screw rod adjacent screw thread between angle, and positive screw rod
Adjacent screw thread between angle thetaλWith its spiral shell number N of teethwBetween relational expression are as follows:
In formula (2), θλAngle between the adjacent screw thread of the positive screw rod of expression；NwIndicate screw thread number.It follows that once positive spiral shell
Bar manufacture is completed, angle theta between the adjacent screw thread of positive screw rodλIt is a preset parameter.
ABCD area defined is air inlet range in Fig. 2, and p and q respectively indicate two adjacent screw threads of positive screw rod
Tooth end position.Sun screw rod shown in Fig. 2 meets face end line and air inlet bicker along for example rotating counterclockwise, as screw thread q
When point B is tangent (when F point is overlapped with B point), by the screw thread of screw thread p and screw thread q and female screw and the cabinet encirclement of positive screw rod
Space is just truncated closing, forms the expansion start volume V between the screw thread p of screw expander and screw thread q1.At this point, by OB line
The angle formed with OA line is air inlet truncation closed angle θin.The angle is smaller, shows that air inlet is closed more early, due to herein
Expansion start volume V approximate in a linear relationship, therefore being formed between stage cavity volume V (θ) and positive screw rod rotational angle theta1Also it gets over
It is small, with expansion end of a period volume V2It compares, in expansion end of a period volume V2In the case where constant, expansion start volume V1It is smaller, then it is built-in
Cubical expansion ratio RVIt is bigger.
As shown in Fig. 2, air inlet angle point B is that closed key point is truncated in screw expander air inlet, where radius
rcIt is referred to as enclosed point radius in the present invention.Along enclosed point radius rcSection expanded view circumferentially is done, as shown in figure 3, can
Angle relation when screw thread closes air inlet can be clearly seen.
As shown in figure 3, rotational angle theta when closing is truncated in the air inlet of screw expander that is to say expansion start angle θ, the angle with
The relationship of other related angles are as follows:
θ=θλ-θR+θin, formula (3)
In formula (3), θ indicates expansion start angle；θλAngle between the adjacent screw thread of the positive screw rod of expression；θinIndicate that air inlet is cut
Disconnected closed angle；θRIndicate the first transverse tooth thickness angle, i.e. screw thread meets side in enclosed point radius rcThe tooth at place and screw thread tooth top radial line Oq
Thick angle, namely indicate screw thread line and enclosed point radius rcCamber line AB angle of the intersection point F relative to screw thread tooth top line Oq.
It is close for charging stage shown in FIG. 1 and expansion stage based on the coordinate and parametric variable that are marked in Fig. 3
Like straight line portion, through deriving the approximately linear expression formula that can be obtained between cavity volume V (θ) and positive screw rod rotational angle theta are as follows:
V (θ)=Vjθ·θ-VC, formula (4)
In formula (4), VjθAnd VCIt is preset parameter relevant to the screw thread geometric parameter of screw expander.
From formula (4) and in conjunction with attached drawing 3:
The expansion start volume V of screw expander1(i.e. air inlet end of a period volume) are as follows:
V1=(θλ+θin-θR)·Vjθ-VC, formula (5)
The expansion end of a period volume V of screw expander2Are as follows:
V2=(2 π+θf)·Vjθ-VC, formula (6)
In formula (6), θfIndicate the second transverse tooth thickness angle, i.e., the other side (non-to meet side) of screw thread is in enclosed point radius rcPlace
With the transverse tooth thickness angle of screw thread tooth top radial line Oq.First transverse tooth thickness angle thetaRWith the second transverse tooth thickness angle thetafConstitute enclosed point radius rcPlace
Full transverse tooth thickness angle.
The built-in cubical expansion ratio of screw expander can be obtained by bringing formula (5) and (6) into formula (1) are as follows:
Closed angle θ is truncated in air inletinIt is determined by the intake port shape and air inlet aperture of screw expander.Air inlet truncation
Closed angle θinIncrease, then the expansion start angle θ of screw expander known to formula (3) increases, thus expansion start volume V1?
It increases accordingly, built-in cubical expansion ratio RVReduce.Vice versa.
First transverse tooth thickness angle thetaRIt is enclosed point radius rcFunction, specific functional relation is related to the screw thread shape of screw rod,
It generally presents are as follows: enclosed point radius rcIt is smaller, then the first transverse tooth thickness angle thetaRThe monotonic function for increasing with screw thread thickness and increasing closes
System.Therefore, enclosed point radius r is adjustedcIt is smaller, make the first transverse tooth thickness angle thetaRIt is bigger, cause expansion start angle θ smaller, thus makes swollen
Swollen start volume V1It is smaller, built-in cubical expansion ratio RVIncrease.
Based on known to formula (7) and above content: closing is truncated in joint or the air inlet for individually changing screw expander
Angle θinWith enclosed point radius rc, the built-in cubical expansion ratio of screw expander can be changed.
As shown in Figures 4 and 5, the screw expander provided in this embodiment with variable volume ratio includes positive screw rod 100, yin
Screw rod 200, cabinet 300, upper supports end cap 400, air inlet end cap 500 and spool cover board 600.Upper supports end cap 400 and cabinet 300
It is fixedly connected, forms a closed cavity 408, positive screw rod 100, female screw 200, air inlet end cap 500 and spool cover board 600 are all set
It is placed in the cavity 408.Positive screw rod 100 is intermeshed with female screw 200, so that positive screw rod 100 is able to drive 200 turns of female screw
It is dynamic.
Spool cover board 600 is set to the lower section of air inlet end cap 500.First through hole 506, are provided on air inlet end cap 500
Two through-holes 507 and third through-hole, and the second through-hole 507 and third through-hole are located at the two sides of first through hole 506.Cartridge cover
Fourth hole 607 and fifth hole 608, and the position of the position of fourth hole 607 and first through hole 506 are provided on plate 600
Corresponding, the position of fifth hole 608 is corresponding with the position of the second through-hole 507.
Above-mentioned screw expander provided in this embodiment further includes main drive shaft 401 arranged in parallel, adjusts operation
Bar 402 and driven shaft 403, and main drive shaft 401, adjust the central axis of operating stick 402 and driven shaft 403 all with upper support
End cap 400 is perpendicular.
The upper end of main drive shaft 401 is connect with generator (not shown) after passing through upper supports end cap 400 with to power generation
Machine output power, and main drive shaft 401 is connect by the first spring bearing 404a with upper supports end cap 400, and winner is driven
Axis 401 can be freely rotated under the support of upper supports end cap 400 and the first spring bearing 404a around center axis thereof；Main driving
The lower end of axis 401 sequentially pass through after the fourth hole 607 in first through hole 506 and spool cover board 600 on air inlet end cap 500 with
The upper end of positive screw rod 100 is connected to one.In a kind of preferred embodiment of the present embodiment, main drive shaft 401 and sun
Screw rod 100 is integrally formed.
The upper end for adjusting operating stick 402 is connect after upper supports end cap 400 with controller 407, and adjusts operating stick
402 upper end is connect by the second spring bearing 404b with upper supports end cap 400, and the lower end for adjusting operating stick 402 passes through air inlet
It is connect by the 4th spring bearing 404d with cabinet 300 after third through-hole on end cap 500, enables and adjust operating stick 402
It is freely rotated around center axis thereof.Controller 407 provides torque and be able to drive to adjusting operating stick 402 adjusts operating stick 402
Rotation.
The upper end of driven shaft 403 is connect by third spring bearing 404c with upper supports end cap 400, so that driven shaft 403
It can be freely rotated around center axis thereof under the support of upper supports end cap 400 and third spring bearing 404c；Driven shaft 403
Lower end sequentially pass through after the second through-hole 507 on air inlet end cap 500 and the fifth hole 608 on spool cover board 600 with female screw
200 upper end is connected to one.In a kind of preferred embodiment of the present embodiment, driven shaft 403 is with female screw 200
Integrally formed.
In a kind of preferred embodiment of the present embodiment, holddown spring 406 is set on main drive shaft 401, and press
Tight spring 406 is between upper supports end cap 400 and half gear cam 700, for half gear cam 700 compression to be made its fitting
In the upper surface of air inlet end cap 500.Preferably, holddown spring 406 can be helical spring or butterfly spring or combinations thereof.
Above-mentioned screw expander provided in this embodiment further includes an air inlet regulating mechanism being set in cavity 408,
The air inlet regulating mechanism includes half gear cam 700, adjustment gear 800, valve spool driving lever 900, radially slides spool 603 and week
To sliding valve core 604.Half gear cam 700, adjustment gear 800 and valve spool driving lever 900 are all set to the upper of air inlet end cap 500
Side.
Half gear cam 700 is an incomplete circular gear.Half gear cam 700 be set to supports end cap 400 with
Between air inlet end cap 500, and half gear cam 700 is set in (main drive shaft on main drive shaft 401 by its centre bore 702
401 pass through the centre bore 702 of half gear cam 700), half gear cam 700 is rotated around main drive shaft 401.Half tooth
The lower surface of wheel cam 700 is provided with the first inclined platform (not shown), and the one side of the first inclined platform is inclined-plane.
Adjustment gear 800 is set between supports end cap 400 and air inlet end cap 500, and adjustment gear 800 passes through it
Centre bore 801, which is set in, to be adjusted in operating stick 402 and (adjusts the centre bore 801 that operating stick 402 passes through adjustment gear 800), so that
It adjusts operating stick 402 and is able to drive the rotation of adjustment gear 800.In a kind of preferred embodiment of the present embodiment, adjustment gear
800 are set in adjusting operating stick 402 for example, by the mode of pin key locking (not shown), so that adjusting operating stick 402
It is able to drive the rotation of adjustment gear 800.
It is connected in such a way that gear engages between adjustment gear 800 and half gear cam 700, so that adjustment gear 800
It is able to drive the rotation of half gear cam 700.By the rotational angle of adjustment gear 800, half gear cam can be accurately controlled
700 rotational angle.
The upper surface of air inlet end cap 500 is fixedly installed driving lever hinged shaft 503 and the second inclined platform 505, and driving lever hinged shaft 503 is in
The one side of cylinder, the second inclined platform 505 is inclined-plane, and the inclined-plane of the second inclined platform 505 is relative on air inlet end cap 500
The tilt angle on surface is equal to tilt angle of the inclined-plane of the first inclined platform relative to half gear cam, 700 lower surface.
Valve spool driving lever 900 is whole L-shaped.The short side end of valve spool driving lever 900 and a side end face of half gear cam 700 are
Cam surface is oppositely arranged and the two is not in contact with when half gear cam 700 turns to short side end and half gear of valve spool driving lever 900
When the cam surface of cam 700 is in contact, half gear cam 700 can push valve spool driving lever 900 to rotate around driving lever hinged shaft 503.Valve
The long side end of core driving lever 900 is provided with circular first pilot hole 901, corner (the i.e. short side and length of valve spool driving lever 900
The junction on side) it is provided with circular hinge axis hole 902.
Perforation spool cover board 600 is provided on spool cover board 600 and arc-shaped the first spool sliding slot 601 and the second valve
Core sliding slot 602, and (i.e. circle where the first spool sliding slot 601 is to dial centered on driving lever hinged shaft 503 for the first spool sliding slot 601
Bar hinged shaft 503 is the center of circle), the second spool sliding slot 602 (i.e. circle where the second spool sliding slot 602 centered on main drive shaft 401
It is the center of circle with main drive shaft 401).The inner end (i.e. close to one end of main drive shaft 401) of first spool sliding slot 601 and the second spool
One end of sliding slot 602 is connected.
It radially slides spool 603 to be set in the first spool sliding slot 601, and can be slided along the first spool sliding slot 601；
Circumferential sliding valve core 604 is set in the second spool sliding slot 602, and can be slided along the second spool sliding slot 602.First spool
Sliding slot 601 is not radially slided the closed part of spool 603 with the second spool sliding slot 602 not by circumferential sliding valve core 604
Closed part is interconnected and forms air inlet 609.In a kind of preferred embodiment of the present embodiment, spool is radially slided
603 and circumferential sliding valve core 604 cross section be in it is wide at the top and narrow at the bottom and on one side be right-angle side, right angle that another side is bevel edge it is terraced
Shape, as shown in figure 9, MT is right-angle side, NG is bevel edge.The shape and size of first spool sliding slot 601 are all set to and radial direction
Sliding valve core 603 matches, and is detached from preventing from radially sliding spool 603 out of first spool sliding slot 601.Second spool sliding slot
602 shape and size are all set to match with circumferential sliding valve core 604, to prevent circumferential sliding valve core 604 from second
It is detached from spool sliding slot 602.
The upper surface for radially sliding spool 603 is fixedly installed the first guide rod 605 straight up；Circumferential sliding valve core
604 upper surface is fixedly installed the second guide rod 606 straight up.First guide rod 605 is cylindrical；Second guide rod
606 be in sloping platform shape, and end face is rounded thereon, and lower end surface is oval, and one side is sliding valve core 604 with respect to the circumferential direction
The inclined-plane that upper surface is obliquely installed, and the inclined-plane with respect to the circumferential direction 604 upper surface of sliding valve core tilt angle be equal to second tiltedly
The inclined-plane of boss 505 relative to 500 upper surface of air inlet end cap tilt angle (or equal to the first inclined platform inclined-plane relative to
The tilt angle of half gear cam, 700 lower surface).
Arc-shaped the first arc-shaped slot 501 and the second arc-shaped slot 502, and first are provided on air inlet end cap 500
The position of arc-shaped slot 501 is corresponding with the first spool sliding slot 601, the position of the second arc-shaped slot 502 and the second spool sliding slot
602 is corresponding.The width of first arc-shaped slot 501 radially slides the width of 603 upper surface of spool less than (being slightly less than), to prevent
Spool 603 is radially slided to be detached from out of first spool sliding slot 601；It is circumferential that the width of second arc-shaped slot 502 is less than (being slightly less than)
The width of 604 upper surface of sliding valve core, to prevent circumferential sliding valve core 604 to be detached from out of second spool sliding slot 602.
Torque spring 504 is set on the outer peripheral surface of driving lever hinged shaft 503.It fixes or is supported in the lower end of torque spring 504
It on driving lever hinged shaft 503, or fixes or is supported on air inlet end cap 500, spool is fixed or be supported in the upper end of torque spring 504
On driving lever 900, and the torque of torque spring 504 acts on so that the long edge tail of valve spool driving lever 900 is intended to far from main drive
The direction (counter clockwise direction shown in figure) of moving axis 401 is mobile.Driving lever hinged shaft 503 is set to the outer of the second arc-shaped slot 502
Side.
First guide rod 605 passes through the first arc-shaped slot 501 and is installed in the first pilot hole 901, so that valve spool driving lever
900 can radially slide spool 603 by the drive of the first guide rod 605 slides along the first spool sliding slot 601.Driving lever hinged shaft
503 are set in hinge axis hole 902, enable valve spool driving lever 900 with driving lever hinged shaft 503 for axis rotation.
The lower surface of half gear cam 700 is provided with one second pilot hole 701, and the shape and ruler of the second pilot hole 701
It is very little to match with the second guide rod 606.Second guide rod 606 is installed in the second pilot hole 701, so that half gear cam
700 can drive circumferential sliding valve core 604 to slide along the second spool sliding slot 602 by the second guide rod 606.
Main drive shaft 401 is connect by the first seal member 405a with upper supports end cap 400, is adjusted operating stick 402 and is passed through
Second seal member 405b is connect with upper supports end cap 400, and driven shaft 403 passes through third seal member 405c and upper supports end cap
400 connections, to realize main drive shaft 401, adjust between operating stick 402 and 403 three of driven shaft and upper supports end cap 400
Sealing.
Half gear cam 700, adjustment gear 800 adjust operating stick 402, radially slide spool 603 and circumferential sliding valve core
604 material is metal material or ceramic material, stainless steel material preferably corrosion-resistant, resistant to high temperature.
Controller 407 can be electric controller, be also possible to electrohydraulic controller or hydraulic controller.Controller 407 is excellent
It is selected as via worm and gear gear and has the electronic execution controller of self-locking function.
For turning air inlet down, the user of the screw expander provided in this embodiment with variable volume ratio is introduced
Method is as follows:
Controller 407 receives operational order from the user, and responds the operational order and drive and adjust operating stick 402；
Adjust operating stick 402 drives adjustment gear 800 to rotate under the driving of controller 407；
Adjustment gear 800 drives half gear cam 700 to rotate under the driving for adjusting operating stick 402；
Half gear cam 700 rotates under the driving of adjustment gear 800 around main drive shaft 401；
When half gear cam 700 is in adjustment gear 800 when being rotated by (such as being rotated in the clockwise direction), half tooth
Wheel cam 700 drives circumferential sliding valve core 604 to slide along the second spool sliding slot 602 by the second guide rod 606, realizes circumferential
The movement of sliding valve core 604 along the circumferential direction, circumferential sliding valve core 604 successively undergo D1E1, D2E2 as shown in FIG. 6,
The positions such as D3E3, in the process the short side end of the cam surface of half gear cam 700 and valve spool driving lever 900 not in contact with；Then,
When half gear cam 700 continue to rotate to the inclined-plane for the first inclined platform for being set to half gear cam, 700 lower surface be set to
When the contact of incline plane of the second inclined platform 505 of 500 upper surface of air inlet end cap, the cam surface of half gear cam 700 reaches valve simultaneously
The short side end of core driving lever 900 and the two is in contact just, and radially slide spool 603 before this moment and be constantly in it
Maximum opening position, i.e., the position AB as shown in FIG. 6；Next, by above-mentioned two inclined-plane while half gear cam 700 rotates
Interaction force is moved up along main drive shaft 401, so that the second guide rod 606 of circumferential sliding valve core 604 is along half tooth
The inner wall of the second pilot hole 701 on wheel cam 700 slides relatively downward, so that the second guide rod 606 be made to stop driving circumferentially
Sliding valve core 604 is slided along the second spool sliding slot 602, and circumferential sliding valve core 604 reaches its minimum open position, i.e., such as Fig. 6
Shown in the position BD, concurrently, the rotation of half gear cam 700 will push valve spool driving lever 900 to rotate around driving lever hinged shaft 503, valve
Core driving lever 900 radially slides spool 603 by the drive of the first guide rod 605 and slides along the first spool sliding slot 601, realizes radial
Sliding valve core 603 is moved along radial direction, is radially slided spool 603 and is successively undergone AB, A1B1, A2B2 as shown in FIG. 6
Equal positions reach its minimum open position, i.e., the position A3B3 as shown in FIG. 6, air inlet at this time until radially sliding spool 603
The regions that mouth 609 surrounds for A3B3CD as shown in FIG. 6.
In short, the method for turning air inlet to minimum aperture down is, circumferential sliding valve core 604 is first slid into its minimum and is opened
Degree, then spool 603 will be radially slided and slide into its minimum aperture.
When needing to tune up air inlet to maximum opening, reversely implement above-mentioned application method.
Radially slide spool 603 along radial direction move and/or the shifting along the circumferential direction of circumferential sliding valve core 604
It is dynamic, the size of air inlet 609 can be adjusted, that is, realizes the adjustment of 609 aperture of air inlet, closed angle θ is truncated in adjustment air inletin
With enclosed point radius rc, to change the expansion start angle of screw expander, the built-in volume for reaching adjusting screw rod expanding machine is swollen
The purpose of swollen ratio.When circumferential sliding valve core 604 is moved along the circumferential direction so that 609 aperture of air inlet reduces, air inlet is cut
Disconnected closed angle θinReduce therewith, the built-in cubical expansion ratio of screw expander increases with it；When radially sliding spool 603 along diameter
When to direction movement so that 609 aperture of air inlet reduces, enclosed point radius rcReduce therewith, the built-in volume of screw expander is swollen
Swollen ratio increases with it.Conversely, when circumferential sliding valve core 604 is moved along the circumferential direction so that 609 aperture of air inlet increases, into
Closed angle θ is truncated in portinIt increases with it, the built-in cubical expansion ratio of screw expander reduces therewith；When radially sliding spool 603
When moved along radial direction so that 609 aperture of air inlet increases, enclosed point radius rcIncrease with it, screw expander it is built-in
Cubical expansion ratio reduces therewith.
It should be strongly noted that the structure of the screw expander provided by the embodiment with variable volume ratio, work original
Reason and application method may be applicable to realize the helical-lobe compressor of its inverse process, therefore provided by the embodiment with variable volume ratio
Screw expander is alternatively referred to as the helical-lobe compressor with variable volume ratio.The compression process and screw expander of helical-lobe compressor
Expansion process it is corresponding, and the two is reciprocal process.It therefore, is spiral shell than corresponding with the built-in cubical expansion of screw expander
The built-in volume compression ratio of bar compressor.The present invention by the built-in cubical expansion of screw expander than with helical-lobe compressor built in
Volume compression ratio is together simply referred to as the volumetric ratio of screw expander, and entitled " a kind of tool of the invention is determined based on this
There is screw expansion (compression) machine of variable volume ratio ".
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.Here all embodiments can not be exhaustive.It is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (10)
1. a kind of screw expander with variable volume ratio, which is characterized in that including cabinet (300), upper supports end cap
(400), air inlet end cap (500) and spool cover board (600)；
Upper supports end cap (400) is fixedly connected with cabinet (300), forms a closed cavity (408)；Air inlet end cap (500) and
Spool cover board (600) is all set in the cavity (408)；Spool cover board (600) is set to the lower section of air inlet end cap (500)；
The screw expander further includes main drive shaft arranged in parallel (401), adjusts operating stick (402) and driven shaft
(403), and main drive shaft (401), adjust the central axis of operating stick (402) and driven shaft (403) all with upper supports end cap
(400) perpendicular；
The screw expander further includes an air inlet regulating mechanism being set in cavity (408), the air inlet regulating mechanism
Including half gear cam (700), adjustment gear (800), valve spool driving lever (900), radially slide spool (603) and circumferential slide-valve
Core (604)；
Half gear cam (700), adjustment gear (800) and valve spool driving lever (900) are all set to the top of air inlet end cap (500)；
Half gear cam (700) is an incomplete circular gear；Half gear cam (700) is set to supports end cap (400)
Between air inlet end cap (500), and half gear cam (700) is set in main drive shaft (401) by its centre bore (702)
On, so that half gear cam (700) can be rotated around main drive shaft (401)；The lower surface of half gear cam (700) is provided with
One inclined platform, the one side of the first inclined platform are inclined-plane；
Adjustment gear (800) is set between supports end cap (400) and air inlet end cap (500), and adjustment gear (800) is logical
It crosses its centre bore (801) to be set in adjusting operating stick (402), so that adjusting operating stick (402) is able to drive adjustment gear
(800) it rotates；
It is connect by the way of gear engagement between adjustment gear (800) and half gear cam (700), so that adjustment gear
(800) it is able to drive half gear cam (700) rotation；
The upper surface of air inlet end cap (500) is fixedly installed driving lever hinged shaft (503) and the second inclined platform (505), the second inclined platform
(505) one side is inclined-plane, and inclination of the inclined-plane of the second inclined platform (505) relative to air inlet end cap (500) upper surface
Angle is equal to tilt angle of the inclined-plane of the first inclined platform relative to half gear cam (700) lower surface；
Valve spool driving lever (900) is whole L-shaped；The cam surface phase of the short side end of valve spool driving lever (900) and half gear cam (700)
To setting and the two is not in contact with when half gear cam (700) turns to short side end and half gear cam of valve spool driving lever (900)
(700) when cam surface is in contact, half gear cam (700) can push valve spool driving lever (900) to turn around driving lever hinged shaft (503)
It is dynamic；The long side end of valve spool driving lever (900) is provided with the first pilot hole (901), and the corner of valve spool driving lever (900) is provided with
Hinge axis hole (902)；
Perforation spool cover board (600) is provided on spool cover board (600) and arc-shaped the first spool sliding slot (601) and second
Spool sliding slot (602), and the first spool sliding slot (601), centered on driving lever hinged shaft (503), the second spool sliding slot (602) is with master
Centered on drive shaft (401)；The inner end of first spool sliding slot (601) is connected with one end of the second spool sliding slot (602)；
It radially slides spool (603) to be set in the first spool sliding slot (601), and can be sliding along the first spool sliding slot (601)
It is dynamic；Circumferential sliding valve core (604) is set in the second spool sliding slot (602), and can be sliding along the second spool sliding slot (602)
It is dynamic；First spool sliding slot (601) is not radially slided spool (603) closed part with the second spool sliding slot (602) not
It is interconnected by circumferential sliding valve core (604) closed part and forms air inlet (609)；
The upper surface for radially sliding spool (603) is fixedly installed the first guide rod (605) straight up；Circumferential sliding valve core
(604) upper surface is fixedly installed the second guide rod (606) straight up；Second guide rod (606) is in sloping platform shape, thereon
End face is rounded, and lower end surface is oval, and one side is that the upper surface of sliding valve core (604) with respect to the circumferential direction is obliquely installed
Inclined-plane, and the inclined-plane with respect to the circumferential direction sliding valve core (604) upper surface tilt angle be equal to the second inclined platform (505) it is oblique
Tilt angle of the face relative to air inlet end cap (500) upper surface；
Arc-shaped the first arc-shaped slot (501) and the second arc-shaped slot (502), and are provided on air inlet end cap (500)
The position of one arc-shaped slot (501) is corresponding with first spool sliding slot (601), the position and second of the second arc-shaped slot (502)
Spool sliding slot (602) is corresponding；
First guide rod (605) passes through the first arc-shaped slot (501) and is installed in the first pilot hole (901), so that spool is dialled
Bar (900) can radially slide spool (603) by the first guide rod (605) drive and slide along the first spool sliding slot (601)；
Driving lever hinged shaft (503) is set in hinge axis hole (902), so that valve spool driving lever (900) can be turned with driving lever hinged shaft (503) for axis
It is dynamic；
The lower surface of half gear cam (700) is provided with one second pilot hole (701), and the shape of the second pilot hole (701) and
Size matches with the second guide rod (606)；Second guide rod (606) is installed in the second pilot hole (701), so that half tooth
Taking turns cam (700) can drive circumferential sliding valve core (604) along the second spool sliding slot (602) by the second guide rod (606)
Sliding.
2. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the screw expander
It further include the positive screw rod (100) and female screw (200) being set in the cavity (408), and positive screw rod (100) and female screw
(200) it is intermeshed, so that positive screw rod (100) is able to drive female screw (200) rotation.
3. the screw expander according to claim 2 with variable volume ratio, which is characterized in that the air inlet end cap
(500) first through hole (506), the second through-hole (507) and third through-hole are provided on, and the second through-hole (507) and third are logical
Hole is located at the two sides of first through hole (506)；Fourth hole (607) and the 5th is provided on the spool cover board (600) to lead to
Hole (608), and the position of fourth hole (607) is corresponding with the position of first through hole (506), the position of fifth hole (608)
It is corresponding with the position of the second through-hole (507)；
The main drive shaft (401) is connect by the first spring bearing (404a) with the upper supports end cap (400), so that described
Main drive shaft (401) can be around central shaft under the support of the upper supports end cap (400) and the first spring bearing (404a)
Line is freely rotated；The lower end of the main drive shaft (401) sequentially passes through the first through hole (506) on the air inlet end cap (500)
Upper end with the fourth hole (607) on the spool cover board (600) afterwards with the positive screw rod (100) is connected to one；
The upper end for adjusting operating stick (402) is connect by the second spring bearing (404b) with the upper supports end cap (400),
The lower end for adjusting operating stick (402) passes through the 4th spring bearing after passing through the third through-hole on the air inlet end cap (500)
(404d) is connect with the cabinet (300), so that the adjusting operating stick (402) can be freely rotated around center axis thereof；
The upper end of the driven shaft (403) is connect by third spring bearing (404c) with the upper supports end cap (400), so that
The driven shaft (403) can be around its center under the support of the upper supports end cap (400) and third spring bearing (404c)
Axis is freely rotated；The lower end of the driven shaft (403) sequentially passes through the second through-hole (507) on the air inlet end cap (500)
Upper end with the fifth hole (608) on the spool cover board (600) afterwards with the female screw (200) is connected to one.
4. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the adjustment gear
(800) it is set on the adjusting operating stick (402) in such a way that pin key locks, so that adjusting operating stick (402) energy
The adjustment gear (800) are enough driven to rotate.
5. the screw expander according to claim 1 with variable volume ratio, which is characterized in that described to radially slide valve
The cross section right-angled trapezium with a narrow upper and lower width of core (603) and the circumferential sliding valve core (604)；The first spool sliding slot
(601) shape and size are all set to match with the spool (603) that radially slides；The second spool sliding slot
(602) shape and size are all set to match with the circumferential sliding valve core (604).
6. the screw expander according to claim 1 with variable volume ratio, which is characterized in that first arc groove
The width in hole (501) is less than the width for radially sliding spool (603) upper surface；The width of second arc-shaped slot (502)
Degree is less than the width of described circumferential sliding valve core (604) upper surface.
7. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the driving lever hinged shaft
(503) it is set to the outside of second arc-shaped slot (502)；Torsion is set on the outer peripheral surface of the driving lever hinged shaft (503)
Spring (504)；The lower end of torque spring (504) is fixed or is supported on the driving lever hinged shaft (503), or fixes or be supported in
On the air inlet end cap (500), the upper end of torque spring (504) is fixed or is supported on the valve spool driving lever (900), and turns round
The torque of power spring (504) acts on so that the long edge tail of the valve spool driving lever (900) is intended to far from the main drive shaft
(401) direction is mobile.
8. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the main drive shaft
(401) it is set on holddown spring (406), and holddown spring (406) is located at the upper supports end cap (400) and half tooth
It takes turns between cam (700), so that it is fitted in the air inlet end cap (500) for compressing half gear cam (700)
Surface.
9. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the main drive shaft
(401) it is connect by the first seal member (405a) with the upper supports end cap (400), the adjusting operating stick (402) passes through
Second seal member (405b) is connect with the upper supports end cap (400), and the driven shaft (403) passes through third seal member
(405c) is connect with the upper supports end cap (400), to realize the main drive shaft (401), the adjusting operating stick (402)
Sealing between driven shaft (403) three and the upper supports end cap (400).
10. the screw expander according to claim 1 with variable volume ratio, which is characterized in that the screw expansion
Machine further includes controller (407)；It is described adjust operating stick (402) upper end pass through the upper supports end cap (400) afterwards with control
Device (407) connection；Controller (407) provides torque and be able to drive to the adjusting operating stick (402) adjusts operating stick (402)
Rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810781865.4A CN109026162B (en) | 2018-07-16 | 2018-07-16 | A kind of screw expansion (compression) machine with variable volume ratio |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810781865.4A CN109026162B (en) | 2018-07-16 | 2018-07-16 | A kind of screw expansion (compression) machine with variable volume ratio |
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| CN109026162B true CN109026162B (en) | 2019-08-16 |
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| CN114555947A (en) * | 2019-10-07 | 2022-05-27 | 开利公司 | Screw compressor with adjustable channel |
| CN114590075B (en) * | 2022-03-23 | 2024-03-29 | 重庆大学 | Cam cooperative spoke changing device suitable for wheel type moving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947078A (en) * | 1975-04-24 | 1976-03-30 | Sullair Corporation | Rotary screw machine with rotor thrust load balancing |
| JP2007085174A (en) * | 2004-01-08 | 2007-04-05 | Koichi Hatamura | Displacement compressor and supercharger using the same |
| KR100715772B1 (en) * | 2004-10-06 | 2007-05-08 | 엘지전자 주식회사 | The capacity variable device of orbiter compressor |
| EP2047103A4 (en) * | 2006-07-27 | 2012-06-27 | Carrier Corp | Screw compressor capacity control |
| WO2011038474A1 (en) * | 2009-10-02 | 2011-04-07 | Hugo Julio Kopelowicz | System for constructing rotary compressors and motors with dynamically variable volumetric displacement and compression rate |
| CN103105022A (en) * | 2012-11-15 | 2013-05-15 | 福建雪人压缩机科技有限公司 | Screw expansion scroll compressor |
| GB2517966B (en) * | 2013-09-06 | 2020-05-20 | Concentric Birmingham Ltd | Variable flow hydraulic machine |
| US10677246B2 (en) * | 2016-07-18 | 2020-06-09 | Johnson Controls Technology Company | Variable volume ratio compressor |
| CN106640387B (en) * | 2016-12-06 | 2022-11-18 | 江苏大学 | Actuator capable of realizing different compression ratios of rotary engine |
| CN106801619A (en) * | 2017-03-03 | 2017-06-06 | 上海维尔泰克螺杆机械有限公司 | The adjustable screw expander of volumetric ratio |
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