CN206694243U - A kind of CP types single-screw (single screw) pump - Google Patents
A kind of CP types single-screw (single screw) pump Download PDFInfo
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- CN206694243U CN206694243U CN201720334087.5U CN201720334087U CN206694243U CN 206694243 U CN206694243 U CN 206694243U CN 201720334087 U CN201720334087 U CN 201720334087U CN 206694243 U CN206694243 U CN 206694243U
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Abstract
The utility model discloses a kind of CP types single-screw (single screw) pump, mixed suitable for single-phase liquid conveying or gas-liquid two-phase defeated, particularly when pump rotates forward and mixes gas transmission liquid two-phase, the interior compression to gas phase media can be realized automatically.It is characterized in that：At screw rod rear portion, spiral groove depth offers first through hole close between 0 region and screw rod rear portion end face, and the valve member of the suction of control fluid or discharge process is provided with first through hole.Corresponding to each screw channel, offer with the identical through hole of first through hole location and shape, be provided with inside each through hole and valve member identical valve member.The utility model proposes a kind of key technology that CP type single screw rod machineries are developed into pump field.The CP type single-screw (single screw) pumps of institute's utility model have the advantages that simple in construction, lift is high, efficiency high, suction capacity are strong, available for fields such as urban water supply, irrigation, oil and gas multiphase flows.
Description
Technical field：
It the utility model is related to a kind of pump, and in particular to a kind of CP types single-screw (single screw) pump.
Background technology：
Screw pump be by the pump housing and screw rod formed engage spatial volume change and moving come trandfer fluid medium or
It is allowed to the drum pump being pressurized.The characteristics of screw pump has a small volume, efficiency high, and lift is high, has self-suction function, is constant flow
Pump, flow are directly proportional to rotating speed.Screw pump includes single-screw (single screw) pump, Quimby pump, three screw pump etc..Single-screw (single screw) pump is often referred to single
The displacement pump of screw rod rotation driving fluid media (medium) in the internal thread groove of the pump housing.Existing literature (the patent No.：WO82/03428 in)
The CP type single screw rod machineries for being widely used in compressor field are applied into pump field, it is proposed that a kind of CP types single-screw (single screw) pump, lead to
Cross the gear motion trandfer fluid medium of single screw rod and star-wheel.Existing literature (the patent No.：The U of CN 203560094) it is middle by list
The single screw rod double star wheel construction being commonly used in helical-lobe compressor applies to pump field.But in above-mentioned two patent, it is not directed to
To the key issue that CP type single screw rod machineries are developed into pump field, i.e., working chamber how convection body asking of being sucked and discharged
Topic.During rotating forward, if still using delivery port of the triangular form aperture as CP type single-screw (single screw) pumps on CP type single screw compressors,
When screw channel is closed, working chamber still has a longer segment distance with aperture in cylinder circumference, because liquid is incompressible, is stranded
Liquid in working chamber can not discharge, and tired liquid phenomenon will occur, and can not realize the function of trandfer fluid medium.During reversion, such as
Fruit is still using suction port of the triangular form aperture on CP type single screw compressors as CP type single-screw (single screw) pumps, when screw channel turns over three
During angle-style aperture, will there is no fluid media (medium) to enter working chamber, but the direction of motion of star-wheel tooth promotes working chamber further to increase,
Because liquid not may expand, tired liquid phenomenon will also occur, the function of trandfer fluid medium can not be realized.(note：Provide star-wheel tooth by
Screw rod front portion is engaging-in, and rear portion is nibbled out, and causes forward direction of the direction that working chamber volume reduces for pump；Provide star-wheel tooth by spiral shell
Bar rear portion is engaging-in, and front portion is nibbled out, and causes the direction of working chamber volume increase for the reverse directions of pump.)
Utility model content：
The purpose of this utility model is the deficiency existing for above-mentioned background technology, proposes a kind of truly feasible in theory
CP type single-screw (single screw) pumps, the CP types single-screw (single screw) pump can not only realize the conveying of single-phase liquid, can also realize multi-phase mixed delivering.
To reach above-mentioned purpose, the utility model is adopted the following technical scheme that to realize：
A kind of CP types single-screw (single screw) pump, including casing and the screw rod for the cylindrical type being arranged in casing and two planes
Star-wheel, on the basis of the line of centres of two star-wheels, screw rod is divided into two parts；
In Part I, screw channel possesses complete length L axially along a screw1, spiral groove depth changes to 0 by maximum, definition
The part is screw rod rear portion, and what is be connected on screw rod with screw rod rear portion is segment hub seal section；In Part II, screw channel is axially along a screw
Length be L2, and L2<L1, spiral groove depth changes to h by maximum1, h1>0, it is anterior for screw rod to define the part；It is relative with screw rod
Should, casing is divided into rear portion with anterior, at screw rod rear portion, spiral groove depth opens up close between 0 region and screw rod rear portion end face
There is first through hole, the valve member of the suction of control fluid or discharge process is installed in first through hole；
Corresponding to each screw channel, offer with the identical through hole of first through hole location and shape, at each
It is provided with inside through hole and is connected with the identical valve member of valve member 7, first through hole with first chamber, first chamber is by screw rod
The internal face of rear portion end face, cabinet rear end cap and cabinet rear is surrounded and formed；Is radially opened up on the housing of cabinet rear
One suction/round, by the front end face of screw rod, the anterior internal face of casing front portion end cap and casing surrounds to be formed second chamber, and
It is connected with star-wheel chamber, the second suction/round is opened up radially at the front in casing.
The utility model, which further improves, to be, first through hole is shoulder hole, including the first circular hole for being connected and the
Two circular holes, and the aperture of the first circular hole is less than the center line in the aperture of the second circular hole, the center line of the first circular hole and the second circular hole
Misaligned, the second circular hole offers internal thread.
The utility model, which further improves, to be, if A points are in screw profile, spiral groove depth is 0 point, and B points are the
One circular hole is on the aperture of screw channel, the closest point with A points, and the distance of A points and B points in screw rod radially is d, if dmin
To ensure that the hole wall of the first circular hole has the d of an enough rigidity and intensity minimum value, A points and B points screw rod radially away from
D minimum from dmin。
The utility model, which further improves, to be, if P points are the end point of screw channel, C points are the first circular hole close to screw channel
Aperture on, the closest point with P points, A points and B points distance determine in the case of, what the first circular hole opened up is located proximate to
Screw channel bottom land curve PD on rear side of star-wheel tooth is minimum to ensure the distance of C points and P points.
The utility model, which further improves, to be, when valve member is mitre valve or spherical valve, valve member includes
Valve plate, spring, lift limiter, spherical or taper valve element；Valve plate be with the second circular hole aperture identical cylinder, valve plate
The face of cylinder is provided with external screw thread and is engaged with the internal thread of the second circular hole；Along the direction with valve plate centerline parallel on valve plate
The second through hole is offered, the second through hole is eccentric orfice, and lift limiter is that afterbody is provided with externally threaded cylinder, lift limit
Device, spring and spherical or taper valve element are sequentially connected setting, and spherical either taper valve element is used to blocking the first circular hole or the
Two through holes.
The utility model further improve is, when valve member is beam valve, valve member by valve plate, valve block and
Lift limiter is formed；Valve block is flexible strip sheet metal, is opened along the direction with valve plate centerline parallel on valve plate
Provided with the second through hole, the second through hole is eccentric orfice, and lift limiter is the higher sheet metal of rigidity, and lift limiter is fastened on valve
On plate, strip valve block is used to block the second through hole.
The utility model, which further improves, to be, 0.01~0.10mm list is left between segment hub seal section and casing endoporus
Side gap.
The utility model, which further improves, to be, sets one to return between the first chamber of pump and the second chamber of pump
Flow tube, and a return valve is set on return duct.
The utility model has following beneficial effect：
The utility model proposes a kind of key technology that CP type single screw rod machineries are developed into pump field.Institute's utility model
CP types single-screw (single screw) pump there is following aspect advantage：
1st, it is simple in construction, complicated row after the delivery port and casting delivery port without opening up given shape on cylinder
Go out passage, greatly reduce the manufacture difficulty of casing.
2nd, single phase liquid medium can be both conveyed, can also mix gas transmission liquid two-phase medium.Allow the volume of institute's trandfer fluid medium
Void fraction, can be from 0 to close to 100% in interior change in a big way.(when void fraction reaches 100%, because no liquid is cold
But, it is only capable of working in the short period of time, delivery temperature should be shut down once limit value is exceeded).
3rd,, can because spring is automatically drained out the setting of valve when pump rotates forward, and advantage is mixed gas transmission liquid two-phase medium
To realize the interior compression to gas phase media automatically.No matter inhale, how row pressure power and void fraction change, gas phase media can be with internal pressure
Contracting mode rises to discharge pressure by suction pressure, relative to gas phase without it is interior compression boost process more save work(, this will make pump compared with
Higher efficiency is kept in wide condition range.
4th, when pump inverts, due to the relative motion of star-wheel and screw rod cause working chamber volume by 0 it is rapid expand to maximum, therefore
With extremely strong, quick suction capacity, it is not required to fill pump before startup.
5th, the pulsation of instantaneous delivery is small.By taking 6 groove screw rods as an example, each screw channel discharges twice in one turn, then screw rod is one
Discharge 12 times, substantially reduce the pulsation of instantaneous delivery in turning.
6th, the structure of the CP types single-screw (single screw) pump can also be used for CP type single screw compressors.
Brief description of the drawings：
Fig. 1：The dimensional structure diagram of CP type single-screw (single screw) pumps；
Fig. 2：The planar structure schematic diagram of CP type single-screw (single screw) pumps；
Fig. 3：The through-hole structure figure opened up on screw rod；
Fig. 4：Through hole opens up position view on screw channel；
Fig. 5：The structure of mitre valve (spherical valve) and its mounting means when pump rotates forward；
Fig. 6：The structure of mitre valve (spherical valve) and its mounting means when pump inverts；
Fig. 7：The structure of beam valve and its mounting means when pump rotates forward；
Fig. 8：The structure of beam valve and its mounting means when pump inverts.
In figure：1- screw rods, 2- star-wheels, 3- casings, 4- screw channels, 5- segment hub seal sections, 6- first through hole, 7- valve members,
8- first chambers, 9- cabinet rear end caps, 10- first inhale/round, 11- second chambers, 12- casings front portion end cap, 13- star-wheels
Chamber, 14- intercommunicating pores, the circular holes of 15- first, the circular holes of 16- second, 17- valve plates, 18- springs, 19- lift limiters, 20- valve elements,
21- second inhales/round, 22- valve blocks, 23- lift limiters, 24- screws.
Embodiment：
Further explanation is made to the utility model below in conjunction with the accompanying drawings.
As shown in Fig. 1 to Fig. 8 a kind of CP types single-screw (single screw) pump provided by the utility model, including casing 3 and it is arranged on casing
The screw rod 1 of cylindrical type (c-type) in 3 and the star-wheel 2 of two planes (p-type), using the line of centres of two star-wheels 2 as base
Standard, screw rod 1 is divided for two parts；In Part I, screw channel 4 axially possesses complete length L along screw rod 11, the depth of screw channel 4 by
Maximum changes to 0, and it is screw rod rear portion to define the part, and what is be connected on screw rod 1 with screw rod rear portion is segment hub seal section 5；Second
Part, length of the screw channel 4 along the axial direction of screw rod 1 is L2, and L2<L1, the depth of screw channel 4 changes to h by maximum1, h1>0, define the part
It is anterior for screw rod；It is corresponding with screw rod 1, casing 3 is divided be rear portion with anterior, at the rear portion of screw rod 1, area of the spiral groove depth close to 0
First through hole 6 is offered between domain and screw rod rear portion end face, the suction of control fluid or discharge process are installed in first through hole 6
Valve member 7；Corresponding to each screw channel, offer with the identical through hole of the location and shape of first through hole 6, every
It is provided with inside one through hole and is connected with the identical valve member of valve member 7, first through hole 6 with first chamber 8, first chamber
8 are formed by the internal face encirclement of screw rod rear portion end face, cabinet rear end cap 9 and the rear portion of casing 3；On the housing at the rear portion of casing 3
Radially open up the first suction/round 10, for second chamber 11 by the front end face of screw rod 1, casing front portion end cap 12 and casing 3 are anterior
Internal face is surrounded and formed, and is connected with star-wheel chamber 13, and the second suction/round 14 is opened up radially at the front in casing.During work, the CP
Type single-screw (single screw) pump no matter forward or reverse can be achieved fluid medium conveying and supercharging.
The first through hole 6 is shoulder hole, including the first circular hole 15 and the second circular hole 16 being connected, and the first circular hole 15
Aperture be less than the second circular hole 16 aperture, the center line of the center line of the first circular hole 15 and the second circular hole 16 is misaligned, second
Circular hole 16 is provided with internal thread.
As shown in figure 3, A points are in screw profile, spiral groove depth is 0 point.B points are the first circular hole 15 close to the hole of screw channel
On mouth, the closest point with A points.The distance of A points and B points in screw rod radially is d.dminTo ensure the hole of the first circular hole 15
Wall has the d of enough rigidity and intensity minimum value.It is characterized in that：A points and B points screw rod distance d radially >=
dmin。
As shown in figure 4, P points are the end point of screw channel.C points be the first circular hole 15 on the aperture of screw channel, with P point distances
Nearest point.In the case where A points and B points distance determine, the screw channel being located proximate on rear side of star-wheel tooth that the first circular hole 15 opens up
Bottom land curve PD is as far as possible small to ensure the distance of C points and P points.Because：When pump rotates forward, C points and P points apart from smaller, when
After star-wheel turns over the first circular hole 15, it is fewer to be enclosed in the fluid that can not be discharged in working chamber by the first circular hole 15.This part
Fluid can discharge working chamber by the gap between screw rod and star-wheel.When pump inverts, C points and P points apart from smaller, when star-wheel by
When P points go to C points, working chamber overcomes the process of back pressure increase volume ofer short duration, also more saves work(.
The working chamber of pump is by the inwall of casing 3, the working surface of star-wheel tooth 22, the front-rear side walls and bottom surface of screw channel 4
Encirclement forms.
Such as Fig. 5, shown in Fig. 6, when installed valve member 7 is mitre valve or spherical valve, valve member include valve plate 17,
Spring 18, lift limiter 19, spherical or taper valve element 20.Valve plate 17 be and diameter macropores identical cylinder.Valve plate 17
The face of cylinder be provided with and external screw thread and be engaged with the internal thread of the second circular hole 16.Along the direction with valve plate centerline parallel in valve
The second through hole 21 is offered on plate 17, through hole is eccentric orfice.Lift limiter is that afterbody is provided with externally threaded cylinder.Lift limits
Device 19, spring 18 and spherical or taper valve element 20 processed are sequentially connected setting, and spherical or taper valve element 20 is used to block first
The through hole 21 of circular hole 15 or second.
When needing pump to rotate forward, referring to Fig. 5, the lift limiter 19 of valve member 7 is connected by screw thread with valve plate 17.
Lift limiter 19, spring 18, the axis of valve element 20 overlap with the axis of the first circular hole 15 of shoulder hole.Valve element 20 is in spring bullet
Closed first circular hole 15 is close to the aperture of the one end of the second circular hole 16 in the presence of power.Valve member 7 act as dump valve.
When needing pump to invert, referring to Fig. 6, the lift limiter 19 of valve member 7 is passed through into screw thread and first through hole 6
Screw rod entity after interface is connected.Lift limiter 19, spring 18, axis and the second through hole 21 on valve plate 17 of valve element 20
Axis overlaps.The aperture of second through hole 21 on closed valve plate 17 in the presence of the spring force of valve element 20.The work of valve member
With for check-valves.
Referring to Fig. 7, Fig. 8, when installed valve member 7 is beam valve, valve member is by valve plate 17, valve block 22 and lift
Limiter 23 is formed.Valve block 22 is flexible strip sheet metal.Lift limiter 23 is the higher sheet metal of rigidity.Lift
The root of limiter 23 and valve block 22 is fastened on valve plate 17 by screw 24, and strip valve block 22 is used to block the second through hole 21.
When needing pump to rotate forward, referring to Fig. 7, valve member 7 is screwed in macropore and by screw threads for fastening, valve block 22 is with rising
Journey limiter 23 is located at close to the side of first chamber 8.Valve member 7 act as dump valve.
When needing pump to invert, referring to Fig. 8, valve member 7 is screwed in macropore and by screw threads for fastening, valve block 22 is with rising
Journey limiter 23 is located at close to the side of screw channel 4.Valve member 7 act as check-valves.
The unilateral gap that 0.01~0.10mm is left between segment hub seal section 5 and casing endoporus be in order to formed clearance seal with
Prevent that the fluid in first chamber 8 from leaking or conversely to second chamber 11.
One return duct is set between the first chamber 8 of pump and the second chamber 11 of pump.One is set on return duct to return
Flow valve.Its effect is：During pump startup, opening return valve ensures prime mover start nonoverload.During pump work, it can be flowed back by adjusting
The aperture of valve adjusts the flow of pump.
The structure of the CP types single-screw (single screw) pump can also be used for CP type single screw compressors.
Embodiment one：Pump rotates forward, and installs situation of the valve member for spherical valve or mitre valve.Referring to Fig. 5, the valve
The second through hole 21 is opened up on plate 17, the through hole is eccentric orfice.The lift limiter 19 of valve member 7 by the screw thread of its afterbody with
Valve plate 17 connects.By the root weld of spring 18 on valve plate 17, valve element (spherical or taper) 20 is welded on the top of spring 18.
Lift limiter 19, spring 18, the center line of valve element 20 should overlap.It is required that the center line of lift limiter 19 is to the center of valve plate 17
The eccentric throw of line is identical to the eccentric throw of the center line of the second circular hole 16 with the center line of the first circular hole 15.Valve group will be mounted with
The valve plate 17 of part is screwed in the second circular hole 16, it is desirable to and the center line of lift limiter 19 overlaps with the center line of the first circular hole 15,
And lock valve plate 17.The rigidity of spring 18 used should both can guarantee that the Opening pressure δ P of valve element 20 were not excessive in order to avoid causing additional energy
Amount loss, and can ensure the aperture that valve element 20 can be made to be adjacent to the first circular hole 15 rapidly after the discharge process of working chamber terminates.
Second chamber 11 of institute's trandfer fluid through the suction pump of the second suction/round 14, now hole 14 is suction port, the second chamber
Room 11 is suction room.The indoor fluid of suction passes through radial and axial both direction through the opening on the front end face back taper of screw rod 1
Into and full screw channel 4.As screw rod 1 drives star-wheel 2 further to rotate, star-wheel tooth will close screw channel 4, now working chamber volume
Reach maximum, complete the suction process of fluid.With the lasting rotation of screw rod 1, working chamber volume will reduce.When institute's trandfer fluid
When medium is single phase liquid medium, fluid pressure raises rapidly.When institute's trandfer fluid medium is two phase flow or multiphase containing gas phase
During stream, with the reduction of working chamber volume, the boosting rule such as following formula (considering by perfect gas) of gas phase media：
PVn=const (1)
In formula, P --- the pressure of work intracavity gas；V --- the volume of work intracavity gas；N --- compression process refers to
Number.During gas-liquid delivery, the pressure of liquid rises with synchronic gas.Due to being automatically drained out the setting of valve, can realize automatically to gas
The interior compression of phase medium.No matter inhale, how row pressure power and void fraction change, within the equal energy of gas phase media compress mode by suction press
Power rises to discharge pressure, and work(is more saved relative to boost process of the gas phase without interior compression, and this will make pump in wider condition range
It is interior to keep higher efficiency.
When the pressure of work cavity fluid is more than the interior pressure P of first chamber 82With the Opening pressure δ P sums P of dump valve2+
During δ P, valve element is pushed up out.Fluid in working chamber is through the first circular hole 15, valve clearance, the second circular hole 16, the second through hole 21 on valve plate
Drain into first chamber 8.First chamber 8 is discharge room.This discharge process is continued until that star-wheel tooth reaches the first circular hole 15, this
When high-pressure fluid in first through hole 6 connected through star-wheel tooth non-pressure bearing face with the low-pressure fluid filled again into screw channel, pressure
Suction chamber pressure is down to, valve element 20 has reclosed the first circular hole 15 in the presence of spring force and both sides pressure difference.Discharge process
After end, remaining a small amount of fluid completes off-load until star-wheel tooth departs from spiral shell by the gap of star-wheel 2 and screw rod 1 in working chamber
Groove.Due to forming clearance seal between the seal section 5 and inboard wall of cylinder block of screw rod, the only a small amount of warp of fluid media (medium) in room 8 is discharged
Seal section 5 is back to low-pressure side, and most of fluid media (medium) is radially discharged through the first suction/round 10.Complete the defeated of fluid medium
Send and be pressurized.
Embodiment two：Pump inverts, and installs situation of the valve member for spherical valve or mitre valve.Referring to Fig. 6, the valve
The second through hole 21 is opened up on plate 17, the hole is eccentric orfice.Screw thread and and rank of the lift limiter of valve member 7 by its afterbody
Screw rod entity after the interface of trapezoidal first through hole 6 is connected.By the root weld of spring 18 in step-like first through hole 6
Interface on, valve element 20 (spherical or taper) is welded on the top of spring 18.Lift limiter 19, spring 18, valve element
20 center line should overlap.It is required that eccentric throw and valve plate 17 of the center line of lift limiter 19 to the center line of the second circular hole 16
The center line of upper second through hole 21 is identical to the eccentric throw of the center line of valve plate 17.Valve plate 17 is screwed in the first circular hole 15, it is desirable to
The center line of lift limiter 19 overlaps with the center line of the second through hole 21 on valve plate 17, and locks valve plate 17.Star-wheel tooth is by P
During point slides to C points, due to not connecting the second circular hole 16, certain vacuum is formd.The rigidity of spring 18 used should
Ensure under conditions of this vacuum or slightly larger than this vacuum, valve element 20 can be opened.
First chamber 8 of institute's trandfer fluid through the suction pump of the first suction/round 10, first chamber 8 are suction room.With screw rod
1 drive star-wheel 2 further rotates, and star-wheel tooth is by by the engaging-in screw channel 4 of P points (spiral groove depth 0) of the end of screw channel 4, now work
Make chamber volume as 0.With the lasting rotation of screw rod 1, working chamber volume will increase, and form negative pressure.The condition of valve opening is：
δP<P1-(P0-Pv) (2)
In formula, P --- VOP；P0--- atmospheric pressure；P1--- suction room fluid meter pressure；Pv--- work
Make the vacuum of intracavitary.When meeting formula (2), valve element 20 is opened by top.Fluid in first chamber 8 is through the second circular hole 16, valve plate
Through hole 21 on 17, valve clearance, the first circular hole 15, it is inhaled into working chamber.First chamber 8 is suction room.This suction process is always
Continue to that star-wheel tooth will be disengaged from screw channel 4, when working chamber volume reaches maximum.As star-wheel tooth departs from screw channel 4, working chamber and the
Two chambers 11 connect, and the low-pressure fluid in working chamber is compressed by the high-pressure fluid in second chamber 11, and pressure rises.Valve element 20 exists
The through hole 21 on valve plate 17 is enclosed under the double action of high-pressure fluid and spring force rapidly.When the star-wheel tooth on symmetrical side star-wheel
After the P points of the engaging-in screw channel, with the rotation of Meshing Pair, the star-wheel tooth scans out the high-pressure fluid in screw channel side by side to the second chamber
Room 11.High-pressure fluid in second chamber 11 is discharged through the second suction/round 14.Complete the conveying and supercharging of fluid medium.
Embodiment three：Pump rotates forward, and installs the situation that valve member is beam valve.Referring to Fig. 7, valve member is by valve plate
17th, valve block 22 and lift limiter 23 are formed.Along the direction with valve plate centerline parallel, the second through hole 21 is set on valve plate, the
Two through holes 21 are eccentric orfice.Valve block 22 is flexible strip sheet metal.Lift limiter 23 is the higher sheet metal of rigidity.
The root of lift limiter 23 and valve block 22 is fastened on valve plate 17 by screw 24.Valve member 7 is screwed in into the second circular hole 16
In and lock, valve block 22 and lift limiter 23 are located at close to the side of first chamber 8.The rigidity of valve block 22 used be able to should protect
It is not excessive in order to avoid causing additional energy loss to demonstrate,prove its Opening pressure δ P, and can ensures the valve after the discharge process of working chamber terminates
Piece 22 can be adjacent to the aperture of the second through hole 21 rapidly.
Second chamber 11 of institute's trandfer fluid through the suction pump of the second suction/round 14, second chamber 11 are suction room.Suck room
Interior fluid is entered by radial and axial both direction through the opening on screw rod front end face back taper and fills screw channel 4.With
Screw rod 1 drives star-wheel 2 further to rotate, and star-wheel tooth will close screw channel 4, and now working chamber volume reaches maximum, completes fluid
Suction process.With the lasting rotation of screw rod 1, working chamber volume will reduce.When institute's trandfer fluid medium is single phase liquid medium
When, fluid pressure raises rapidly.When institute's trandfer fluid medium is two phase flow or multiphase flow containing gas phase, with working chamber volume
Reduction, shown in the boosting rule such as formula (1) of gas phase media.During gas-liquid delivery, the pressure of liquid rises with synchronic gas.Due to
The setting of valve is automatically drained out, the interior compression to gas phase media can be realized automatically.No matter inhale, how row pressure power and void fraction become
Change, compress mode rises to discharge pressure by suction pressure within the equal energy of gas phase media, relative to boosting of the gas phase without interior compression
Cheng Gengwei saves work(, and this will make pump keep higher efficiency in wider condition range.
When the pressure of work cavity fluid is more than the interior pressure P of first chamber 82With the Opening pressure δ P sums P of dump valve2+
During δ P, valve block is pushed up out.Fluid in working chamber enters through the first circular hole 15, the second circular hole 16, the second through hole 21, beam valve valve clearance
Enter first chamber 8.First chamber 8 is discharge room.This discharge process is continued until that star-wheel tooth reaches the first circular hole, at this moment exists
Fluid connects through star-wheel tooth non-pressure bearing face with the low-pressure fluid filled again into screw channel in first through hole 6, and pressure is down to suction room
Pressure, valve block 22 have reclosed the aperture of the second through hole 21 on valve plate 17 in the presence of spring force and both sides pressure difference.Row
Go out after process terminates, remaining a small amount of fluid completes off-load until star-wheel tooth takes off by the gap of star-wheel 2 and screw rod 1 in working chamber
From screw channel.Due to forming clearance seal between the seal section 5 and inboard wall of cylinder block of screw rod, the fluid media (medium) discharged in room 8 is only few
Measure sealed section 5 and be back to low-pressure side, most of fluid media (medium) is radially discharged through the first suction/round 10.Complete fluid medium
Conveying and supercharging.
Example IV：Pump inverts, and installs the situation that valve member is beam valve.Referring to Fig. 8, valve member 7 is by valve plate
17th, valve block 22 and lift limiter 23 are formed.Along the direction with valve plate centerline parallel, the second through hole 21 is set on valve plate 17,
Second through hole 21 is eccentric orfice.Valve block 22 is flexible strip sheet metal.Lift limiter 23 is the higher metal of rigidity
Piece.The root of lift limiter 23 and valve block 22 is fastened on valve plate 17 by screw 24.Valve member 7 is screwed in into the second circular hole
In 16 and lock, valve block 22 is located at close to the side of screw channel 4 with lift limiter 23.The rigidity of valve block used need to ensure it in work
Make chamber volume and by 0 expand and form certain vacuum to open and not cause larger flow losses.
First chamber 8 of institute's trandfer fluid through the hole suction pump of the first suction/round 10, first chamber 8 are suction room.With spiral shell
Bar 1 drives star-wheel 2 further to rotate, and star-wheel tooth is by by the engaging-in screw channel 4 of P points (spiral groove depth 0) of the end of screw channel 4, now
Working chamber volume is 0.With the lasting rotation of screw rod 1, working chamber volume will increase, and form negative pressure.The condition of valve opening is such as
Shown in formula (2), when satisfying the condition, valve block 22 is opened by top.Fluid in first chamber 8 is through the second through hole on valve plate 17
21, valve clearance, the second circular hole 16, the first circular hole 15, it is inhaled into working chamber.First chamber 8 is suction room.This suction process is always
Continue to that star-wheel tooth will be disengaged from screw channel 4, when working chamber volume reaches maximum.As star-wheel tooth departs from screw channel 4, working chamber and the
Two chambers 11 connect, and the low-pressure fluid in working chamber is compressed by the high-pressure fluid in second chamber 11, and pressure rises.Valve block 22 exists
The second through hole on valve plate 17 is enclosed under the double action of high-pressure fluid and valve block elastic force rapidly.Star on symmetrical side star-wheel
After the P points of the engaging-in screw channel of the gear teeth, with the rotation of Meshing Pair, the star-wheel tooth scans out the high-pressure fluid in screw channel side by side to
Two chambers 11.High-pressure fluid in second chamber 11 is discharged through the second suction/round 14, completes the conveying and increasing of fluid medium
Pressure.
Claims (8)
- A kind of 1. CP types single-screw (single screw) pump, it is characterised in that the spiral shell including casing (3) and the cylindrical type being arranged in casing (3) The star-wheel (2) of bar (1) and two planes, on the basis of the line of centres of two star-wheels (2), screw rod (1) is divided into two Point；In Part I, screw channel (4) axially possesses complete length L along screw rod (1)1, screw channel (4) depth changes to 0 by maximum, It is screw rod rear portion to define the part, and what is be connected on screw rod (1) with screw rod rear portion is segment hub seal section (5)；In Part II, screw channel (4) it is L along the length of screw rod (1) axial direction2, and L2<L1, screw channel (4) depth changes to h by maximum1, h1>0, defining the part is Screw rod is anterior；It is corresponding with screw rod (1), casing (3) is divided into rear portion with anterior, at screw rod (1) rear portion, spiral groove depth is close to 0 Region and screw rod rear portion end face between offer first through hole (6), be provided with the first through hole (6) suction of control fluid or The valve member (7) of discharge process；Corresponding to each screw channel, offer with the identical through hole of first through hole (6) location and shape, it is logical at each It is provided with inside hole and is connected with the identical valve member of valve member 7, first through hole (6) with first chamber (8), first chamber (8) surrounded and formed by the internal face of screw rod rear portion end face, cabinet rear end cap (9) and casing (3) rear portion；At casing (3) rear portion Housing on radially open up the first suction/round (10), second chamber (11) is by the front end face of screw rod (1), casing front portion end cap (12) and the anterior internal face of casing (3) is surrounded and formed, and is connected with star-wheel chamber (13), and second is opened up radially at the front in casing Suction/round (14).
- A kind of 2. CP types single-screw (single screw) pump according to claim 1, it is characterised in that first through hole (6) is shoulder hole, including The first circular hole (15) and the second circular hole (16) being connected, and the aperture of the first circular hole (15) is less than the hole of the second circular hole (16) Footpath, the center line of the center line and the second circular hole (16) of the first circular hole (15) is misaligned, and the second circular hole (16) offers internal thread.
- 3. a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that set A points as in screw profile, screw channel is deep The point for 0 is spent, B points are that the closest point with A points, A points and B points are in screw rod on the aperture of the close screw channel of the first circular hole (15) Distance radially is d, if dminTo ensure that the hole wall of the first circular hole (15) has the d of enough rigidity and intensity minimum value, The minimum d of distance d of A points and B points in screw rod radiallymin。
- 4. a kind of CP types single-screw (single screw) pump according to claim 3, it is characterised in that set end point of the P points as screw channel, C points It is the closest point with P points on the aperture of the close screw channel of the first circular hole (15), in the case where A points and B points distance determine, The screw channel bottom land curve PD that what the first circular hole (15) opened up be located proximate on rear side of star-wheel tooth is minimum to ensure the distance of C points and P points.
- A kind of 5. CP types single-screw (single screw) pump according to claim 1, it is characterised in that when valve member (7) be mitre valve or During spherical valve, valve member (7) includes valve plate (17), spring (18), lift limiter (19), spherical or taper valve element (20)；Valve plate (17) is to be provided with external screw thread simultaneously with the second circular hole (16) aperture identical cylinder, the face of cylinder of valve plate (17) It is engaged with the internal thread of the second circular hole (16)；It is logical that second is offered on valve plate (17) along the direction with valve plate centerline parallel Hole (21), the second through hole (21) are eccentric orfice, and lift limiter (19) is that afterbody is provided with externally threaded cylinder, lift limiter (19), spring (18) and spherical or taper valve element (20) are sequentially connected setting, and spherical or taper valve element (20) is used to block First circular hole (15) or the second through hole (21).
- A kind of 6. CP types single-screw (single screw) pump according to claim 1, it is characterised in that when valve member (7) is beam valve, Valve member (7) is made up of valve plate (17), valve block (22) and lift limiter (23)；Valve block (22) is flexible strip gold Belong to piece, the second through hole (21) is offered on valve plate (17) along the direction with valve plate centerline parallel, the second through hole (21) is inclined Heart hole, lift limiter (23) are the higher sheet metal of rigidity, and lift limiter (23) is fastened on valve plate (17), strip valve block (22) it is used to block the second through hole 21.
- 7. a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that segment hub seal section (5) and casing endoporus Between leave 0.01~0.10mm unilateral gap.
- 8. a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that in first chamber (8) and the pump of pump One return duct is set between second chamber (11), and a return valve is set on return duct.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720334087.5U CN206694243U (en) | 2017-03-31 | 2017-03-31 | A kind of CP types single-screw (single screw) pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720334087.5U CN206694243U (en) | 2017-03-31 | 2017-03-31 | A kind of CP types single-screw (single screw) pump |
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| CN206694243U true CN206694243U (en) | 2017-12-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837782A (en) * | 2017-03-31 | 2017-06-13 | 西北农林科技大学 | A kind of CP types single-screw (single screw) pump |
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2017
- 2017-03-31 CN CN201720334087.5U patent/CN206694243U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837782A (en) * | 2017-03-31 | 2017-06-13 | 西北农林科技大学 | A kind of CP types single-screw (single screw) pump |
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