CN206694249U - A kind of delivery port structure of CP types single-screw (single screw) pump - Google Patents
A kind of delivery port structure of CP types single-screw (single screw) pump Download PDFInfo
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- CN206694249U CN206694249U CN201720087130.2U CN201720087130U CN206694249U CN 206694249 U CN206694249 U CN 206694249U CN 201720087130 U CN201720087130 U CN 201720087130U CN 206694249 U CN206694249 U CN 206694249U
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Abstract
The utility model discloses a kind of delivery port structure of CP types single-screw (single screw) pump, the delivery port is opened on cylinder inner wall, and the openend profile of delivery port is made up of tetra- sections of space curves of ab, bc, cd, da；Where it is assumed that e points are star-wheel when nibbling out screw rod and the intersection point of cylinder, a part for the circular arc that ab curves are generated by e points along cylinder surface circumferential movement；It is tooth front closure helix by the screw rod tooth top helix on front side of star-wheel tooth when defining star-wheel tooth closing screw channel；Bc curves are the part of space curve overlapped on cylinder with tooth front closure helix, under limiting case, b points and the coincidence of c points；Da curves are a curve for pressing close to cylinder neutral surface；Cd curves are the line of c points and d points, are the single hop or multistage curve of arbitrary shape, and not across tooth front closure helix otherwise the break-through of high side to low side will occur for cd curves.The utility model has the advantages that small volume, flow are big, lift is high and mechanical balance performance is good.
Description
Technical field：
It the utility model is related to a kind of CP types single-screw (single screw) pump, and in particular to a kind of delivery port knot of CP types single-screw (single screw) pump
Structure.
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 shape issue for the key issue, i.e. delivery port that CP type single screw rod machineries are developed into pump field.If indiscriminately imitate CP type lists
Delivery port of the vent ports as CP type single-screw (single screw) pumps on helical-lobe compressor, when being closed due to screw channel, working chamber and hole
Mouth still has a longer segment distance in cylinder circumference, and the liquid being confined in working chamber can not discharge, and tired liquid phenomenon will occur,
So that fluid pressure steeply rises, too high hydraulic pressure will be destroyed star-wheel tooth, can not realize the function of trandfer fluid medium.
Utility model content：
The purpose of this utility model is the deficiency existing for above-mentioned background technology, there is provided a kind of CP types single-screw (single screw) pump
Delivery port structure, for CP type single screw rod machineries to be developed into a kind of key technology in pump field, can not only realize list
The conveying of phase liquid medium, it can also realize the mixed defeated of multiphase medium.
To reach above-mentioned purpose, the utility model is adopted the following technical scheme that to realize：
A kind of delivery port structure of CP types single-screw (single screw) pump, the delivery port is opened on cylinder inner wall, and delivery port
Openend profile be made up of tetra- sections of space curves of ab, bc, cd, da；Wherein,
Assuming that e points are star-wheel when nibbling out screw rod and the intersection point of cylinder, ab curves are given birth to by e points along cylinder surface circumferential movement
Into circular arc a part；The star-wheel tooth of engaging-in screw rod is defined, is for star-wheel tooth front side, close low-pressure side close on high-tension side
On rear side of star-wheel tooth, when defining star-wheel tooth closing screw channel, the screw rod tooth top helix on front side of star-wheel tooth is tooth front closure helix；
Bc curves are the part of space curve overlapped on cylinder with tooth front closure helix, under limiting case, b points
Overlapped with c points；
Da curves are a curve for pressing close to cylinder neutral surface；
Cd curves are the line of c points and d points, are the single hop or multistage curve of arbitrary shape, and cd curves are not across tooth
Front closure helix, the break-through of high side to low side otherwise will occur.
The utility model, which further improves, to be, next instantaneous state of working chamber is formed in star-wheel tooth closing screw channel
When, working chamber connection delivery port, the high-pressure fluid medium after delivery port flows back to working chamber, the fluid media (medium) in working chamber
Acted on by high-pressure fluid medium, pressure rise is simultaneously forcefully discharged；When fluid media (medium) when containing gas phase of conveying, gas phase portion
Without interior compression process.
The utility model, which further improves, to be, delivery port is by the blind hole close to tooth front closure helix and close
The through hole of cylinder neutral surface is formed, and blind hole plays a part of compensating groove.
The utility model, which further improves, to be, delivery port is through hole.
The utility model, which further improves, to be, when pumped (conveying) medium is gas-liquid two-phase or gas-liquid-solid three-phase, according to
The design of the import void fraction of pumped (conveying) medium and the required discharge pressure adjustment delivery port reached, is realized in gas phase media
Compression process is to improve the efficiency of pump, and the openend profile of the delivery port after adjustment is by a ' b ', b ' c ', c ' d ', d ' a ' four
Section space curve is formed, and wherein a points overlap with a ', and curve a ' b ' overlap with curve ab and b ' between a points and b points, d '
A ' curves are a curve for pressing close to cylinder neutral surface, and b ' c ' curves and c ' d ' curves are arbitrary shape, but not across on front side of tooth
Enclosing coil line.
The utility model, which further improves, to be, unloading hole is offered in inside screw.
The utility model, which further improves, to be, unloading hole is by radial hole, axial hole, valve pocket and releases the common structure in hole
Into；Wherein, radial hole is opened in the endpiece of each screw channel, axial hole is opened within the screw rod entity of screw channel bottom land, valve pocket and
Release Kong Jun and be opened in screw rod low pressure end face, and radial hole connects with axial hole, valve pocket connects with axial hole, releases hole and valve pocket
Connection.
The utility model, which further improves, to be, is provided with spring unloading valve in valve pocket, spring unloading valve include valve seat,
Spring and valve block, are connected through a screw thread and fasten between valve seat and valve pocket；When gas-liquid mixture hypertonia in working chamber and
When not connecting delivery port yet, high-pressure medium pushes valve block open, through valve pocket and releases the cavity before hole flows to screw rod low pressure end face
It is interior with off-load, until working chamber connects with delivery port, stopping off-load.
The utility model, which further improves, to be, offers gap at a points of delivery port, gap is shaped as square
Shape or triangle.
The utility model, which further improves, is there are two radial direction cloth along central axis of air cylinder center symmetric setting on casing
The delivery port put.
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, specifically,
The delivery port structure of CP types single-screw (single screw) pump provided by the utility model, the delivery port are opened on cylinder inner wall, and are discharged
The openend profile in aperture is made up of tetra- sections of space curves of ab, bc, cd, da；Where it is assumed that e points are star-wheel when nibbling out screw rod with
The intersection point of cylinder, a part for the circular arc that ab curves are generated by e points along cylinder surface circumferential movement；Define the star of engaging-in screw rod
The gear teeth, close on high-tension side on front side of star-wheel tooth, close low-pressure side is on rear side of star-wheel tooth.When defining star-wheel tooth closing screw channel,
It is tooth front closure helix by the screw rod tooth top helix on front side of star-wheel tooth；Bc curves be cylinder on tooth front closure spiral
A part for the space curve that line overlaps, under limiting case, b points and c points overlap；Da curves are press close to cylinder neutral surface one
Curve；Cd curves are the line of c points and d points, are the single hop or multistage curve of arbitrary shape, and cd curves are not across on front side of tooth
Enclosing coil line, the break-through of high side to low side otherwise will occur.For delivery port when meeting above-mentioned regular, area should not mistake
Greatly to ensure the intensity of cylinder and rigidity, area is not also answered too small in order to avoid flow losses increase.Above-mentioned aperture can ensure in star-wheel
Tooth closing screw channel forms the next instantaneous of working chamber, working chamber connection delivery port, the high-pressure fluid medium after delivery port to
Working chamber is flowed back, and the fluid media (medium) in working chamber is acted on by high-pressure fluid medium, and pressure rise is simultaneously forcefully discharged.When defeated
The fluid media (medium) when containing gas phase sent, gas phase portion is without interior compression process.
Further, delivery port is by the blind hole close to tooth front closure helix and the through hole structure close to cylinder neutral surface
Into, and blind hole plays a part of compensating groove, certainly, delivery port can also all through holes, but the intensity of cylinder and rigidity meeting
Reduce, and the passing away after causing after tap is circumferentially long along cylinder, and the requirement to casting improves.
Further, can be according to the import gassiness of pumped (conveying) medium when pumped (conveying) medium is gas-liquid two-phase or gas-liquid-solid three-phase
The design of rate and the required discharge pressure adjustment delivery port reached, realizes the interior compression process to gas phase media to improve pump
Efficiency.The openend profile of delivery port after adjustment is made up of four sections of a ' b ', b ' c ', c ' d ', d ' a ' space curves, a points with
A ' coincidences, curve a ' b ' must be overlapped with curve ab and b ' between a points and b points.D ' a ' curves are to press close to cylinder neutral surface
A curve.B ' c ' curves and c ' d ' curves can be arbitrary shape, but can not cross tooth front closure helix.
Further, when the import void fraction of institute's pumped (conveying) medium or the operating mode of pump fluctuate, working chamber may be caused
The discharge pressure for having reached setting is not yet connected with delivery port.To prevent work cavity pressure from further increasing or even occurring
Tired liquid, unloading hole is offered in inside screw；Wherein, radial hole is drilled with from the endpiece of each screw channel, then is bored from screw rod low pressure end face
There is axial hole, and radial hole connects with axial hole, Milling Process has valve pocket and connected with axial hole, is drilled with and releases hole and valve pocket company
It is logical；Radial hole, axial hole, valve pocket and release hole and collectively form unloading hole；Spring unloading valve is installed in valve pocket, spring unloads
Lotus valve includes valve seat 24, spring and valve block, is connected through a screw thread and fastens between valve seat and valve pocket；When gas-liquid is mixed in working chamber
When compound hypertonia and not yet connection delivery port, high-pressure medium pushes valve block open, and screw rod low pressure is flowed to releasing hole through valve pocket
With off-load in cavity before end face, until working chamber connects with delivery port, stop off-load.
Further, due to the wall for thering is a thickness to be h between da curves and cylinder neutral surface, when working chamber latter end passes through wall, nothing
Method discharges the liquid remained in working chamber, causes tired liquid so that the pressure of residual liquid drastically raises.In order to avoid this
Situation, sets a gap at a points of delivery port, and the gap can rectangular, triangle or other shapes so that remaining
Liquid can smoothly be discharged into delivery port.
Further, two identical radial direction delivery ports are symmetrically provided with casing along central axis of air cylinder with respectively
Discharge the fluid media (medium) in symmetrical screw channel.
In short, there is following several respects advantage：
1st, single phase liquid medium can be both conveyed, can also mix gas transmission liquid two-phase medium or gas-liquid-solid three-phase medium.For
Granular solids medium, after working chamber is inhaled into, easily it can be discharged by delivery port；For sticking together in screw channel side wall or
It the solid of cylinder inner wall, can be wiped off respectively by screw rod tooth outer rim or star-wheel flank, and be delivered to delivery port.Both can convey
Low viscosity fluid medium, can also conveying high-viscosity fluid medium.Therefore, CP types screw pump can be widely applied to urban water supply and
Heating, irrigation and water conservancy irrigation, oil and gas multiphase flow, chemical process flow, the food and medicine fields such as liquid conveying.
When the 2nd, mixing defeated, delivery port 2 can be adjusted according to the void fraction and the required discharge pressure reached of pumped (conveying) medium
Size is to realize the interior compression to gas phase in institute's pumped (conveying) medium to improve the efficiency of pump.
3rd, because star-wheel is arranged symmetrically along pitch, therefore screw rod stress balance, star-wheel stress is also smaller, therefore complete machine power
Learn functional, low to bearing requirements, with small vibration, noise is low.
4th, there is the major advantage of drum pump, including constant flow, range of flow are wide, efficiency high, lift are high, have self-priming work(
Energy, no pressure pulsation.
Brief description of the drawings：
Fig. 1：The schematic diagram of CP type single-screw (single screw) pumps；
Fig. 2：A kind of delivery port schematic diagram of the CP type single-screw (single screw) pumps without interior compression process；
Fig. 3：A kind of delivery port schematic diagram for the CP type single-screw (single screw) pumps for having an interior compression process；
Fig. 4：A kind of delivery port schematic diagram for the CP type single-screw (single screw) pumps for having an interior compression process；
Fig. 5：Part is the delivery port schematic diagram that blind hole part is through hole；
Fig. 6：The schematic cross-sectional view of unloading hole on screw rod；
Fig. 7：The delivery port structural representation of CP type single-screw (single screw) pumps.
In figure：1- cylinders, 2- delivery ports, 3- tooth front closure helixes, 4- cylinder neutral surfaces, 5- working chambers, 6- are blind
Hole, 7- through holes, 8- passing aways, 9- walls, 10- gap, 11- screw rods, 12- star-wheels, 13- suction inlets, 14- star-wheel teeth, 15- screw channels,
The total outlets of 16-, 17- unloading holes, 18- radial holes, 19- screw rod low pressure end face, 20- axial holes, 21- valve pockets, 22- release hole,
23- spring unloading valves, 24- valve seats, 25- springs, 26- valve blocks.
Embodiment：
The utility model is made further instructions below in conjunction with drawings and examples.
It is a kind of typical CP type single-screw (single screw) pumps, by cylinder (c-type) screw rod 11 and a pair of planar shape with reference to figure 1
(p-type) star-wheel 12 is formed, and because the pump has self-suction function, fluid media (medium) enters the inner chamber of pump from the suction inlet 13 of pump, further
Ground, it is enclosed in by star-wheel tooth 14 in the working chamber 5 being made up of screw channel 15, cylinder 1 and star-wheel tooth 14, with the rotation of Meshing Pair,
Working chamber, which is connected, delivery port and constantly to be reduced, and it is interior and from total that the medium in working chamber is forced to be discharged to passage after delivery port
Outlet 16 is discharged, and discharge process is until star-wheel tooth 14 nibbles out screw channel 15 completely, untill working chamber volume is reduced to zero.With spiral shell
Bar constantly rotates, the completion suction to go round and begin again successively, the course of work discharged.
Referring to figs. 2 to Fig. 7, a kind of delivery port structure of CP types single-screw (single screw) pump provided by the utility model, the tap
Mouth 2 is opened on the inwall of cylinder 1, and the openend profile of delivery port 2 is made up of tetra- sections of space curves of ab, bc, cd, da；Its
In, it is assumed that e points are the intersection point with cylinder 1 when star-wheel 12 nibbles out screw rod 11, and ab curves are e points along the surface circumferential movement institute of cylinder 1
A part for the circular arc of generation；The star-wheel tooth of engaging-in screw rod is defined, close on high-tension side on front side of star-wheel tooth, close to low-pressure side
For on rear side of star-wheel tooth.When defining the closing screw channel 15 of star-wheel tooth 14, by the tooth top helix of screw rod 11 on front side of star-wheel tooth 14 for before tooth
Side seal closes helix 3；Bc curves are the part of space curve overlapped on cylinder 1 with tooth front closure helix 3, limit feelings
Under condition, b points and c points overlap；Da curves are a curve for pressing close to cylinder neutral surface 4；Cd curves are the line of c points and d points, are
The single hop or multistage curve of arbitrary shape, and otherwise it is lateral high pressure will to occur for cd curves not across tooth front closure helix 3
The break-through of low-pressure side.
Wherein, to close screw channel 15 in star-wheel tooth 14 and form the next instantaneous of working chamber 5, working chamber 5 connects delivery port 2,
High-pressure fluid medium after delivery port 2 flows back to working chamber 5, and the fluid media (medium) in working chamber 5 is by high-pressure fluid medium
Effect, pressure rise are simultaneously forcefully discharged；When fluid media (medium) when containing gas phase of conveying, gas phase portion is without interior compression process.
In addition, delivery port 2 is by the blind hole 6 close to tooth front closure helix 3 and the through hole 7 close to cylinder neutral surface 4
Form, and blind hole 6 plays a part of compensating groove.
When pumped (conveying) medium is gas-liquid two-phase or gas-liquid-solid three-phase, according to the import void fraction of pumped (conveying) medium and required reach
The design of the discharge pressure adjustment delivery port 2 arrived, realizes the interior compression process to gas phase media to improve the efficiency of pump, and adjust
The openend profile of delivery port 2 after whole is made up of four sections of a ' b ', b ' c ', c ' d ', d ' a ' space curves, wherein a points and a '
Point overlaps, and curve a ' b ' overlap with curve ab and b ' between a points and b points, and d ' a ' curves are press close to cylinder neutral surface 4 one
Bar curve, b ' c ' curves and c ' d ' curves are arbitrary shape, but not across tooth front closure helix 3.
Preferably, unloading hole 17 is offered inside screw rod 11.Unloading hole 17 is by radial hole 18, axial hole 20, valve pocket 21
And release hole 22 and collectively form；Wherein, radial hole 18 is opened in the endpiece of each screw channel 15, and axial hole 20 is opened in screw channel bottom land
Screw rod entity within, valve pocket 21 and release hole 22 and be opened in screw rod low pressure end face 19, and radial hole 18 and axial hole 20
Connection, valve pocket 21 connect with axial hole 20, release hole 22 and connected with valve pocket 21；Spring unloading valve 23, bullet are installed in valve pocket 21
Spring unloading valve 23 includes valve seat 24, spring 25 and valve block 26, is connected through a screw thread and fastens between valve seat 24 and valve pocket 21；When
In working chamber gas-liquid mixture hypertonia and not yet connect delivery port when, high-pressure medium pushes valve block 26 open, through valve pocket 21 with
Release in the cavity before hole 22 flows to screw rod low pressure end face 19 with off-load, until working chamber 5 connects with delivery port, stop unloading
Lotus.
Preferably, gap 10 is offered at a points of delivery port 2, gap 10 is shaped as rectangle or triangle.
Preferably, there is the delivery port (2) of two radial arrangements on casing along central axis of air cylinder center symmetric setting.
Embodiment one：For Fig. 1 CP type single-screw (single screw) pumps, when pumped (conveying) medium is single-phase liquid, or defeated gassiness is mixed
The multiphase medium of phase and without to gas phase carry out in compress when, delivery port as shown in Figure 2 can be used.Fig. 2 is half of cylinder
Expanded view, it can be seen that outlet is made up of tetra- sections of space curves of ab, bc, cd, da.E points be when star-wheel nibbles out screw rod with
The intersection point of cylinder.A part for the circular arc that ab curves are generated by e points along cylinder surface circumferential movement.Bc curves be cylinder on
A part for the space curve that tooth front closure helix overlaps.Da curves are to press close to the straight line of cylinder neutral surface and away from gas
Cylinder neutral surface distance is h.Cd curves are the line of c points and d points, and straight line is expanded into along cylinder.Slitted at a points provided with rectangle
Mouth 10, to eliminate the tired liquid phenomenon of working chamber endpiece.Coordinate system soy as shown in Figure 2 is established, obtains the equation of delivery port
As shown in formula (1)：
In formula, RswFor star-wheel radius；A is the centre-to-centre spacing of screw rod and star-wheel；RsrFor screw rod radius；SbFor the s values of b points；sw
For star-wheel corner；B is the star-wheel facewidth；Sw, d are corner when passing through d points on front side of star-wheel tooth；T is star-wheel tooth space width half angle；W is
Delivery port width；sbFor the s values of b points；ya,ydFor a, the y values of d points.
During using delivery port described by formula (1), fluid media (medium) just closed by star-wheel into working chamber after just with tap
Mouthful connection, by the high-pressure medium after delivery port effect so as to pressure rise.
Embodiment two：For Fig. 1 CP type single-screw (single screw) pumps, when the mixed defeated multiphase medium containing gas phase and need to gas phase
When compression is to improve the efficiency of pump in carrying out, delivery port as shown in Figure 3 can be used.Fig. 3 is the expanded view of half of cylinder, from figure
In it is visible, outlet is made up of four sections of a ' b ', b ' c ', c ' d ', d ' a ' space curves.Point a ' must overlap with point a, curve a ' b ' palpuses
Overlapped with curve ab and b ' between a points and b points.D ' a ' curves are to press close to the straight line of cylinder neutral surface 4 and away from cylinder
Neutral surface distance is h.B ' c ' oriented parallels are the line of c points and d points in bc curves, c ' d ' curves, and one is expanded into along cylinder
Straight line.Coordinate system as shown in Figure 3 is established, obtains the equation of delivery port：
C ' coordinate value s on s axlesc' or c ' d ' lengths of a curve by institute's pumped (conveying) medium void fraction and required reach
The discharge pressure arrived determines.
During using delivery port described by formula (2), fluid media (medium) closed by star-wheel into working chamber 5 after not immediately with row
Go out aperture a ' b ' c ' d ' connections, with the rotation of screw rod, working chamber volume reduces, and gas phase media is compressed, while liquid phase medium
Pressure also increase.After the bc sections on screw rod tooth top helix 3 on front side of star-wheel tooth overlap with b ' c ', working chamber 5 is
With delivery port a ' b ' c ' d ' connections.When medium void fraction or operating mode fluctuate, working chamber hypertonia may be caused
But delivery port a ' b ' c ' d ' are not can turn on yet, and this will cause motor input torque excessive or even the tired liquid phenomenon of generation burns electricity
Machine.Now, in working chamber medium by by unloading hole off-load as shown in Figure 6 until connect delivery port.
Embodiment three：For Fig. 1 CP type single-screw (single screw) pumps, when the mixed defeated multiphase medium containing gas phase and need to gas phase
When compression is to improve the efficiency of pump in carrying out, delivery port as shown in Figure 4 can be used.Fig. 4 is the expanded view of half of cylinder, from figure
In it is visible, outlet is made up of four sections of a " b ", b " c ", c " d ", d " a " space curves.Point a " must overlap with point a, curve a " b " palpus
Overlapped with curve ab and b " points are between a points and b points.D " a " curve is the straight line and and cylinder for pressing close to cylinder neutral surface 4
The distance of neutral surface 4 is h.For b " c " oriented parallels in d " a " curve, c " d " curve is the line of c " point and d " point, is deployed along cylinder
For straight line.A " b " c " d " expands into a standard rectangular along cylinder.Coordinate system as shown in Figure 4 is established, obtains tap
The equation of mouth：
C " puts the coordinate value s on s axlesc″Or c " d " lengths of a curve by institute's pumped (conveying) medium void fraction and required reach
Discharge pressure determine.
During using delivery port described by formula (3), fluid media (medium) closed by star-wheel into working chamber 5 after not immediately with row
Go out aperture a " b " c " d " connections, with the rotation of screw rod, working chamber volume reduces, and gas phase media is compressed, while liquid phase medium
Pressure also increase.When screw rod tooth top helix 3 on front side of star-wheel tooth crosses c " points, just connect with delivery port a " b " c " d "
It is logical.Compared with embodiment two, after the switch, the increase speed of orifice flow area is smaller, so for the delivery port of embodiment three
Larger flow losses, but the delivery port simple shape in embodiment three can be caused, it is easy to process.The off-load machine of embodiment three
Reason is identical with embodiment two.
Example IV：For Fig. 1 CP type single-screw (single screw) pumps, in order to improve cylinder rigidity, delivery port 2 can be used and leaned on
The part of nearly tooth front closure helix 3 is blind hole 6, plays a part of compensating groove, and is through hole 7 close to the part of neutral surface 4
Form.Fig. 5 is the expanded view of half of cylinder, it can be seen that will row on the basis of the delivery port abcd in embodiment one
Go out aperture and be divided into two parts, quadrangle afgd and quadrangle fbcg, fg can be the curve of arbitrary shape, in the present embodiment for
Straight line.During using the delivery port, fluid media (medium) can be by quadrangle fbcg tables after being closed by star-wheel into working chamber 5
The groove in face drains into through hole afgd.Quadrangle blind hole fbcg plays a part of compensating groove and ensures that discharge process is smoothed out without sending out
Raw tired liquid.
It is described above, only it is preferred embodiment of the present utility model, is not that other forms are made to the utility model
Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent
The equivalent embodiment of change.But it is every without departing from the content of the technical scheme of the utility model, it is real according to technology of the present utility model
Verify any simple modification, equivalent variations and remodeling made for any of the above embodiments, still belong to the protection of technical solutions of the utility model
Scope.
Claims (9)
1. a kind of delivery port structure of CP types single-screw (single screw) pump, it is characterised in that the delivery port (2) is opened in cylinder (1)
On wall, and the openend profile of delivery port (2) is made up of tetra- sections of space curves of ab, bc, cd, da；Wherein,
A part for the circular arc that ab curves are generated by e points along cylinder (1) surface circumferential movement, e points are that star-wheel (12) nibbles out spiral shell
During bar (11) with the intersection point of cylinder (1)；
Bc curves are the part of space curve overlapped on cylinder (1) with tooth front closure helix (3), under limiting case, b
Point and c points overlap；Tooth front closure helix (3) is the screw rod (11) on front side of star-wheel tooth (14) closing screw channel (15) clock star gear teeth
Tooth top helix, star-wheel tooth front side are on rear side of on high-tension side side, star-wheel tooth for the star-wheel tooth (14) of engaging-in screw rod (11)
The star-wheel tooth (14) of engaging-in screw rod (11) is close to the side of low-pressure side；
Da curves are a curve for pressing close to cylinder neutral surface (4)；
Cd curves are the line of c points and d points, are the single hop or multistage curve of arbitrary shape, and cd curves are not across on front side of tooth
Enclosing coil line (3), the break-through of high side to low side otherwise will occur.
A kind of 2. delivery port structure of CP types single-screw (single screw) pump according to claim 1, it is characterised in that delivery port
(2) it is made up of the blind hole (6) close to tooth front closure helix (3) and the through hole (7) close to cylinder neutral surface (4), and blind hole
(6) compensating groove is played a part of.
A kind of 3. delivery port structure of CP types single-screw (single screw) pump according to claim 1, it is characterised in that delivery port
(2) it is through hole.
4. the delivery port structure of a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that work as pumped (conveying) medium
For gas-liquid two-phase or gas-liquid-solid three-phase when, the openend profile of delivery port (2) is by four sections of a ' b ', b ' c ', c ' d ', d ' a ' skies
Half interval contour is formed, and wherein a points overlap with a ', and curve a ' b ' overlap with curve ab and b ' between a points and b points, and d ' a ' are bent
Line is a curve for pressing close to cylinder neutral surface (4), and b ' c ' curves and c ' d ' curves are arbitrary shape, but is sealed not across on front side of tooth
Close helix (3).
5. the delivery port structure of a kind of CP types single-screw (single screw) pump according to claim 4, it is characterised in that in screw rod (11)
Inside offers unloading hole (17).
A kind of 6. delivery port structure of CP types single-screw (single screw) pump according to claim 5, it is characterised in that unloading hole (17)
By radial hole (18), axial hole (20), valve pocket (21) and release hole (22) and collectively form；Wherein, radial hole (18) is opened in
The endpiece of each screw channel (15), axial hole (20) is opened within the screw rod entity of screw channel bottom land, valve pocket (21) and releases hole
(22) screw rod low pressure end face (19) is opened in, and radial hole (18) connects with axial hole (20), valve pocket (21) and axial hole
(20) connect, release hole (22) and connected with valve pocket (21).
7. the delivery port structure of a kind of CP types single-screw (single screw) pump according to claim 6, it is characterised in that in valve pocket (21)
Spring unloading valve (23) is installed, spring unloading valve (23) includes valve seat (24), spring (25) and valve block (26), valve seat (24)
It is connected through a screw thread and fastens between valve pocket (21).
8. the delivery port structure of a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that in delivery port
(2) gap (10) is offered at a points, gap (10) is shaped as rectangle or triangle.
9. the delivery port structure of a kind of CP types single-screw (single screw) pump according to claim 1, it is characterised in that along gas on casing
Cylinder central shaft center symmetric setting has the delivery port (2) of two radial arrangements.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106762627A (en) * | 2017-01-23 | 2017-05-31 | 西北农林科技大学 | A kind of delivery port structure of CP types single-screw (single screw) pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762627A (en) * | 2017-01-23 | 2017-05-31 | 西北农林科技大学 | A kind of delivery port structure of CP types single-screw (single screw) pump |
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