CN101871450B

CN101871450B - Small-flow high-lift radial piston pump

Info

Publication number: CN101871450B
Application number: CN2010102026597A
Authority: CN
Inventors: 余文凌
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-08
Filing date: 2010-06-08
Publication date: 2012-08-22
Anticipated expiration: 2030-06-08
Also published as: CN101871450A

Abstract

The invention relates to a small-flow high-lift radial piston pump, which is mainly formed by a pump body, a pump cover, a piston, a rotor, an eccentric shaft and a motor. A rotor bushing is fixedly installed on the external circle of the rotor. A radial hole with smaller diameter which is coaxial with the radial through hole of the rotor is arranged on the rotor bushing. Narrow grooves which are communicated with the radial through hole are arranged on the two sides of the radial hole. A volute tongue bushing is installed in the pump body. A sealing compensation block is installed in the volute tongue of the volute tongue bushing. A discharge check valve is arranged in the sealing compensation block. The width of the volute tongue is larger than the width of a radial passage on the rotor bushing. By adopting the structure, the area and the length of the sealing surface of the clearance of the volute tongue are increased, the radial sealing clearance between the sealing compensation block and the rotor bushing is kept to be zero, the discharge pressure can be obviously improved and the goals of small flow and high lift are reached. Moreover, in combination with the advantages of an original rotor pump that the efficiency is high, the energy is saved, the self-absorption performance is superior, the runner is smooth and the pump can be used for delivering viscous liquid with fibrous or particle impurities and the like, and the application prospect of the small-flow high-lift radial piston pump is wide.

Description

Small-flow high-lift radial piston pump

Technical field

The present invention relates to a kind of displacement pump, particularly a kind of small-flow high-lift radial piston pump.

Background technique

Flow is less than 10M ³/ h, lift receive extensive use greater than the small flow and high lift pump of 100M in space flight, chemical industry, pharmacy, metallurgy and light industry, and the type of pump has multistage centrifugal pump, high speed centrifugal pump, peripheral pump, reciprocating pump etc., and they respectively have pluses and minuses.

For centrifugal pump, the specific speed of this small flow and high lift pump belongs to the ultra-low specific speed pump all below 20, and efficient is very low, generally all below 30%, like the vertical stainless steel multistage centrifugal pump of QDLA type, when flow is 0.6M ³When/h lift is 100M, need 12 grades of impeller serials, when lift is 198M, need 24 grades of impeller serials, efficient has only 30%, and assembly process process is poor, and rigidity is not enough.

High speed centrifugal pump can be accomplished pump and motor direct connection, and volume is little, but its rotating speed is high, at 5000-16000rpm; What have reaches 20000rpm, needs to quicken through gear, and will adopt composite impeller and preposition inducer; Complex structure, machining accuracy is high, particularly high gear; High-speed bearing high speed machine seal request is all very high, and processing and maintenance cost are higher relatively, and efficient is not high.

It is peripheral pump that the low-flow high-lift water pump adopts at present more, because of it is simple in structure, easy to maintenance, volume is little, in light weight, price is low, vortex pump with open impeller also has self-priming performance; Can carry out vapour, liquid and mix defeatedly, receive widely-usedly in many departments of national economy, but be that closed peripheralpump, vortex pump with open impeller, centrifugal vortex pump, single suction peripheral pump or its disadvantage of multistage peripheral pump are that efficient is all extremely low; The highlyest be no more than 50%, most of peripheral pump efficient are at 20%-40%, and what have has only tens percent; Like patent ZL96203684.6 " axial entrance peripheral pump ", efficient has only 12-24%, is energy-consuming product; Do not meet energy-conservation requirement; Peripheral pump can not be used for pumping the bigger medium of viscosity in addition, also can only carry pure liquid, when containing particulate species impurity in the liquid; Will reduce pump performance because of wearing and tearing cause axially the increase with radially gap, or cause pump not work.

Small-sized piston pump or plunger pump such as metering pump also can reach low-flow high-lift, possess efficient, self-priming, vapour-liquid mix defeated, can transporting viscous liquid etc. advantage; Because valve arrangement is arranged; Reciprocal time is very low, and generally all in 100 times/minute, the flow pulse is serious; Following process is brought harmful effect, adds defectives such as vibration, noise.

The rotor pump of emerging valveless has caused people's attention, and its self-priming performance is good; Eliminated the retardation phenomenon of valve, simple in structure, volume is little, reciprocal time is high and can transporting viscous liquid, like " rotor-type piston pump " of patent ZL021127763.8; ZL96228726.1 " double cylinder double acting rotopiston pump ", ZL00211851.3 " suction rotor pump synchronously " be to be can only small flow but all there is same general character defective in these rotor pumps; Can not be high-lift, reason is the radial hole equal diameters of dress piston on cut water sealed width and the rotor on the pump housing, and is as shown in Figure 1; The pump housing 1, rotor 2, piston 3, cut water 4 are arranged among the figure, and the isolation of this pump hyperbaric chamber and low pressure chamber is to rely on the pump housing cut water 4 that inner chamber is divided into suction chamber and discharge side, and it has played the seal action of valve; The length of its sealed width has determined quality and the height of head pressure of the performance of sealing; In operation process, when piston hole diameter during to last cut water 4 width, because both width equate; Its seal length is instantaneous to be zero; Produce the loss of liquid return and volumetric efficiency, therefore make the raising head pressure reach the high-lift severely restricts that receive, limited it and in low-flow high-lift, used.

Summary of the invention

The objective of the invention is to: to the shortcoming of rotor pump and above-mentioned various pump and existence, propose a kind of compact structure, flow steadily, good seal performance, small-flow high-lift radial piston pump that head pressure is high.

In order to achieve the above object; Small-flow high-lift radial piston pump of the present invention comprises the pump housing 1 that has suction port and exhaust port, and this pump housing 1 inner chamber is equipped with the rotor 2 that has row's radial direction through hole vertically at least; Be equipped with in the radial direction through hole of this rotor 2 by eccentric stiffener or camshaft mechanism and can produce pistons reciprocating 3; Its special way is: the cylindrical of said rotor 2 is fixed with rotor cover 6, and this rotor cover 6 is shaped on and the coaxial radial hole of rotor 2 radial direction through hole, and the diameter of this radial hole is less than the diameter of rotor 2 radial direction through hole; Both sides have the narrow groove that is communicated with radial hole, form the radial passage; The said pump housing 1 cylindrical cavity is fixed with a cut water cover 5; The inner chamber of this cut water cover 5 is provided with a pair of wide and the pump housing 1 inner chamber is isolated into the cut water 4 of zone of high pressure and low pressure area; The width of this cut water 4 is symmetrical in the center line of the pump housing 1; In the said cut water 4 sealing compensation piece 8 is housed, is provided with in the sealing compensation block 8 and discharges one-way valve 10; The width of the cut water 4 of said cut water cover 5 is greater than the width of radial passage on the rotor cover 6.

The elasticity gland 9. of sealing compensation piece 8 being pressed to rotor cover 6 surfaces is housed on the sealing compensation piece 8 described in the technical solution of the present invention

Cut water 4 both sides of the cover of cut water described in the technical solution of the present invention 5 can be made into the passage of various difformities and size.

Discharge one-way valve 10 described in the technical solution of the present invention on the sealing compensation piece 8 can be ball check valve.

The outlet of the one-way valve 10 of discharge described in the technical solution of the present invention can be overlapped the aperture 11 that leads to the pump housing 1 zone of high pressure on 5 with cut water and communicated.

The present invention focuses on the weak link that solves present rotor pump: promptly on the seal of hyperbaric chamber and low pressure chamber, behind the valve arrangement of rotor pump cancellation conventional reciprocating pump, the zone of high pressure of rotor pump and low pressure area lean on the cut water seal; Present existing rotor pump all adopts the equal diameters of radial direction through hole of sealed width and the rotor of cut water 4, and is as shown in Figure 1, and the pump housing 1, rotor 2, piston 3, cut water 4 are wherein arranged; The projection of graticule mesh presentation graphs 1 sealing surface among Fig. 2 can be known from figure, when epitrochanterian radial direction through hole forwards the aligning cut water to; Because two width equate that at this moment the sealing surface at maximum diameter place is instantaneous is zero, hyperbaric chamber and low pressure chamber are instantaneous gangs up; Liquid return has reduced volumetric efficiency, has also reduced head pressure. and solution of the present invention is: when strengthening lengthening cut water sealing surface; It is zero that minimizing radial seal gap makes it; Its measure is: in the pump housing 1, add cut water cover 5, rotor 2 cylindricals add rotor cover 6, and are as shown in Figure 3; The pump housing 1, rotor 2, piston 3, cut water 4 are arranged among the figure; Cut water cover 5, rotor cover 6, eccentric shaft 7, sealing compensation piece 8, eccentric shaft 7, elasticity gland 9, discharge parts such as one-way valve 10, small channel 11, this structure is processed the both sides of cut water 4 on the cut water cover 5 and is changed from small to big, again from large to small passage; And the reduced that rotor is overlapped the coaxial radial hole at radial direction through hole position on 6 respective rotor 2, and being shaped on the narrow groove that is communicated with radial hole in the both sides of this radial hole, the width of cut water is arranged to overlap greater than rotor the width of 6 radial passages; The projection of the sealing surface after the improvement such as Fig. 4; The area and the length of its sealing all greatly increase, and simultaneously, sealing compensation piece 8 are housed in cut water 4; Utilize elasticity gland 9 that sealing compensation piece 8 is pressed to rotor and overlap 6 surfaces; Making in this section the gap of sealing surface is zero, has consequently reduced backflow, has improved head pressure.

The characteristics of small-flow high-lift radial piston pump of the present invention are piston " short stroke, high frequencies ", and its reciprocal time is very high, but the flow of carrying each time is little; Therefore the radial hole diameter of rotor cover 6 can dwindle, and in addition, piston its unit time discharge amount in each suction cycle is also also unequal; Piston discharge amount when 90 degree positions is maximum; Piston is when two limit positions, and discharge capacity is minimum, so the radial passage of the cover of the rotor when the piston limit position 6 can narrow down to into narrow groove.

In sealing compensation piece 8, be provided with among the present invention and discharge one-way valve 10; Be when in the confined area of cut water 4, moving and produce vexed car phenomenon for fear of piston 3; After piston 3 gets into the confined area of cut water width; When piston moved on discharge opeing, liquid was eliminated the vexed car phenomenon of pump through discharging one-way valve and small channel 11 to the discharge side discharge opeing.

This motion principle that utilizes connecting rod, the rotor pump of the suction function of realization pump, hydraulic loss and volumetric loss are all little; Efficient is very high, and piston 3 is double-action work, and each passes on twice of liquid; Running up down, flow is exported steady no pulse, owing to cancelled valve arrangement; Therefore vibrate little, noise is low, adopt structure of the present invention after, its good effect is: because sealing area and length increasing; Radial clearance between sealing compensation piece 8 and the rotor cover 6 is zero, can obviously improve head pressure, reaches low-flow high-lift; Add rotor pump original energy-efficient, self-priming performance is superior, runner is unobstructed, can carry viscosity and the advantages such as liquid of fibrous or particulate contamination are arranged, and will obtain to use widely prospect.

Description of drawings

Fig. 1 is the structural drawing of existing rotor-type piston pump cut water sealing.

Fig. 2 is the projection drawing of sealing surface among Fig. 1.

Fig. 3 is the structural drawing that the present invention improves sealability.

Fig. 4 is the projection drawing of the sealing surface of Fig. 3.

Fig. 5 is embodiments of the invention.

Fig. 6 is the B-B sectional view of Fig. 5.

Embodiment

Fig. 5 is the radial piston pump of embodiments of the invention-have dual-supporting eccentric shaft 7 and double-piston 3, and Fig. 6 is the B-B sectional view of Fig. 5.

Show the pump housing 1, rotor 2, piston 3, cut water 4, cut water cover 5, rotor cover 6, eccentric shaft 7, sealing compensation piece 8, elasticity gland 9 among the figure, discharge one-way valve 10, small channel 11, pump cover 12, bearing 13, gland seal device 14, motor 15, rolling ring 16, eccentric wheel 17.

Adopt the eccentric shaft 7 of a rotatable dual-supporting in this example; One end bearing of this eccentric shaft 7 is on pump cover 12 in the eccentric opening; The other end passes piston 3 waist elongated slots and is bearing in the eccentric opening of eccentric wheel 17; These eccentric wheel 17 removable mountings are also coaxial with it at the inner chamber of rotor 2, and eccentric shaft 7 is equipped with rolling ring 16. with piston 3 waist elongated slot hinged places

When motor 15 drives rotor 2 rotations; Piston 3 does relatively reciprocating motion around the radial direction through hole that eccentric shaft 7 rotates on the edge rotor 2 on one side; The to-and-fro motion of piston 3 produces volume-variation; Suck liquid again from the discharge side drain from suction chamber, wherein cure process need be made in the surface of friction pair such as eccentric shaft 7, rolling ring 16, piston 3, sealing compensation piece 8.

This instance has increased sealing area and length, and has utilized sealing compensation piece 8 to reduce the radial clearance of sealing surface through the ingenious combination of cut water cover 5 with rotor cover 6, and to make it be zero, can obviously improve head pressure, reaches low-flow high-lift; Add dual-piston structure, piston is mutually 90 degree, each piston double-action work, revolution transfusion four times; Run up down at motor, flow is exported steady no pulse, vibrate little, noise is low; The displacement pump principle of this volume-variation, hydraulic loss and volumetric loss are all little, and efficient is very high.

Claims

1. small-flow high-lift radial piston pump; Comprise the pump housing (1) that has suction port and exhaust port; This pump housing (1) inner chamber is equipped with the rotor (2) that has row's radial direction through hole vertically at least, is equipped with in the radial direction through hole of this rotor (2) by eccentric stiffener or camshaft mechanism and can produces pistons reciprocating (3), and it is characterized in that: the cylindrical of said rotor (2) is fixed with a rotor cover (6); This rotor cover (6) is shaped on and the coaxial radial hole of rotor (2) radial direction through hole; The diameter of this radial hole is less than the diameter of rotor (2) radial direction through hole, and both sides have the narrow groove that is communicated with radial hole, forms the radial passage; The said pump housing (1) cylindrical cavity is fixed with a cut water cover (5); The inner chamber of this cut water cover (5) is provided with a pair of wide and the pump housing (1) inner chamber is isolated into the cut water (4) of zone of high pressure and low pressure area; The width of this cut water (4) is symmetrical in the center line of the pump housing (1); Sealing compensation piece (8) is housed in the said cut water (4), is provided with in the sealing compensation block (8) and discharges one-way valve (10); The width of the cut water (4) of said cut water cover (5) is gone up the width of radial passage greater than rotor cover (6).

2. small-flow high-lift radial piston pump according to claim 1 is characterized in that: the elasticity gland (9) of sealing compensation piece (8) being pressed to rotor cover (6) surface is housed on the said sealing compensation piece (8).

3. small-flow high-lift radial piston pump according to claim 1 is characterized in that: cut water (4) both sides of said cut water cover (5) can be made into the passage of various difformities and size.

4. small-flow high-lift radial piston pump according to claim 1 is characterized in that: the discharge one-way valve (10) on the said sealing compensation piece (8) is a ball check valve.

5. small-flow high-lift radial piston pump according to claim 1 is characterized in that: the aperture (11) that leads to the pump housing (1) zone of high pressure on the outlet of said discharge one-way valve (10) and the cut water cover (5) communicates.