CN102720649A

CN102720649A - Diaphragm metering pump

Info

Publication number: CN102720649A
Application number: CN2012102157501A
Authority: CN
Inventors: 李强; 柴立平; 何玉杰; 程道武; 燕浩; 姜漫
Original assignee: HEFEI HUASHENG PUMPS VALVES CO Ltd
Current assignee: HEFEI HUASHENG PUMPS VALVES CO Ltd
Priority date: 2012-06-27
Filing date: 2012-06-27
Publication date: 2012-10-10

Abstract

The invention belongs to the field of a metering pump and particularly relates to a diaphragm metering pump. The diaphragm metering pump provided by the invention comprises a pump body; a liquid inlet hole path and a liquid outlet hole path are arranged on the pump body; the diaphragm metering pump further comprises an energy storage and discharge unit; the output end of the energy storage and discharge unit is communicated with the liquid outlet hole path; the energy storage and discharge unit has two working states; when the pump body is in a liquid discharging process, a part of liquid passing through the liquid outlet hole path is absorbed and stored by the energy storage and discharge unit; and when the pump body is in a liquid absorbing process, the liquid absorbed by the energy storage and discharge unit is released and discharged through the outlet end. The diaphragm metering pump provided by the invention has a simple and practical structure; the pressure pulse at the outlet of the pump body can be effectively reduced; and the diaphragm metering pump is stable and reliable in operation.

Description

A kind of diaphragm metering pump

Technical field

The invention belongs to the metering pump field, be specifically related to a kind of diaphragm metering pump.

Background technique

Diaphragm metering pump utilizes particular design processing flexibility and processing barrier film to replace plunger; Concrete structure can be with reference to shown in Figure 1; It has feed liquor duct and fluid duct; Above-mentioned duct and barrier film belong between the main aperture road and are provided with the one-way valve c that is used for the restriction pressure one-directional fluid flow, rely on the reciprocating feed action of driving mechanism b during work and make barrier film a breathing phenomenon occur, the final pulsed function that realizes for pressure fluid; Because the intermediate isolating effect of barrier film, it has structurally really realized the isolation fully between pressure fluid and driving and the lubricating structure.At present, diaphragm metering pump has become the main force's pump type in the fluid metering application.In fact, the conventional membrane metering pump is when possessing above advantage, and its deficiency is also very obvious: it is when work; Because the structural feature of itself; Driving mechanism reciprocating action once, barrier film is promptly accomplished respiration, accomplishes once suction-discharge process thereby drive fluid; Above-mentioned pulsed feed liquid way has caused on the one hand the discontinuity of its discharge flow rate, and simultaneously, big pulse shock must be born in its pump housing outlet port when also causing each feed flow, thereby the safe and reliable operation of its pump housing parts is brought hidden danger.

Summary of the invention

The purpose of this invention is to provide a kind of diaphragm metering pump simple in structure, can effectively reduce the pressure pulse in pump housing outlet port, its working stability is reliable.

For realizing above-mentioned purpose; The present invention has adopted following technological scheme: a kind of diaphragm metering pump, comprise the pump housing, and the said pump housing is provided with feed liquor duct and fluid duct; Said diaphragm metering pump also comprises and holds the exoergic unit; The outlet end that holds the exoergic unit is communicated on the fluid duct, and there are two kinds of working staties in the said exoergic unit that holds: when the pump housing was in the discharge opeing process, the exoergic unit absorbed and storage by holding through the segment fluid flow in the fluid duct; When the pump housing is in the imbibition process, holds fluid that the exoergic unit absorbed and discharge and discharge through its outlet end.

Major advantage of the present invention is: when the pump housing is in the discharge opeing process, through holding the absorption accumulation of energy function of exoergic unit, can play the effect of the pulse shock at effective reduction pump discharge place; When the pump housing is in the imbibition process, hold the exoergic unit and discharge original fluid that absorbs again voluntarily, thereby the continuity that realizes the pump discharge fluid is discharged.The present invention is simple and practical, can effectively reduce the pressure pulse in pump housing outlet port, and its working stability is reliable.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of position-limiting unit;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is the structural representation that holds the exoergic unit;

Fig. 5 is the I part partial enlarged drawing of Fig. 1;

Fig. 6 holds the exoergic unit to be in the structure sectional view under the normal state;

Fig. 7 holds the exoergic unit to be in the structural representation under the energy accumulating state.

Embodiment

A kind of diaphragm metering pump; Comprise the pump housing; The said pump housing is provided with feed liquor duct 10 and fluid duct 20, and said diaphragm metering pump comprises also and hold exoergic unit 30 that the outlet end that holds exoergic unit 30 is communicated on the fluid duct 20; There are two kinds of working staties in the said exoergic unit 30 that holds: when the pump housing is in the discharge opeing process, absorb and storage by holding exoergic unit 30 through the segment fluid flow in the fluid duct 20; When the pump housing is in the imbibition process, holds fluid that exoergic unit 30 absorbed and discharge and discharge through its outlet end.

In fact; If the pulse of pumping of diaphragm metering pump that will be at present traditional is regarded as sinusoidal words that possess crest and trough, the effect of holding exoergic unit 30 among the present invention is when the pump housing is in the discharge opeing process; As shown in Figure 7; Through holding the absorption accumulation of energy function of exoergic unit 30, pump the crest value of pulse to play effective reduction, reduce the effect of the pulse shock at pump discharge place when the discharge opeing process; When the pump housing is in the imbibition process, as shown in Figure 6, hold exoergic unit retraction or artificial discharge original pressure fluid that absorbs voluntarily again, thereby reach the effect that improves the trough value that pumps pulse; The present invention is through holding the setting of exoergic unit 30; Can effectively reduce aforementioned sinusoidal fluctuating range, for the continuity discharging that realizes the pump discharge fluid provides possibility, it is simple and practical; Can effectively reduce the pressure pulse in pump housing outlet port, equipment work is reliable and stable.

As further preferred version of the present invention: shown in Fig. 1-7, the said exoergic unit 30 that holds holds the exoergic parts for elasticity.During actual selecting for use, its concrete implementation can be multiple, like resilient sleeve, rubber bag or the like, as long as can realize the parts of its elasticity accumulation of energy and automatic exoergic, can realize that all it holds the exoergic operation; Of the present invention being preferably: hold exoergic unit 30 and be the barrel-shaped elastic bellows of cover, its bung place constitutes its outlet end.Like this; When the pump housing was in the discharge opeing process, the piston of driving mechanism was compressed into, and the barrier film evagination is also pushed the pressure fluid that is positioned at the main aperture road; This moment, pressure fluid got into fluid duct 20 by one-way valve c; Most of pressure fluid flows out through pump discharge, and the fraction pressure fluid is held, and the exoergic unit absorbs and storage, and hold the exoergic unit and be in elastic expansion state as shown in Figure 5 this moment; When the pump housing is in the imbibition process; Backward stroke of the piston; Fluid duct 20 internal pressures begin to reduce gradually, and the hydrodynamic pressure in holding exoergic unit 30 is during greater than fluid duct 20 fluid pressures, under itself resilient force; Hold exoergic unit 30 exoergics; Fraction pressure fluid stored in it flows out through pump discharge, thereby the effect of having played the discontinuity of improving the pump discharge fluid and having reduced the pump discharge pressure pulsation finally can safe and reliable work provide effective assurance for diaphragm metering pump.

Further, for guaranteeing to hold the reliably working of exoergic unit 30, its range of expansion is done like delimit: holding exoergic unit 30, radially to allow range of expansion be 1～1.2 times, and its axial expansion allowed band is 1～1.5 times here.During actual the use; Can realize its physics limit function through establish stop collar in the outer cover of holding exoergic unit 30; Be specially shown in Fig. 1-3 and 6-7; Diaphragm metering pump also comprises and is nested in the position-limiting unit 40 that holds 30 outer wall places, exoergic unit, and position-limiting unit 40 profiles are frame-like, and its frame-like surrounds the inner chamber that forms and constitutes the limit chamber 41 that exoergic unit 30 range of expansion are held in restriction.Certainly; The actual configuration of position-limiting unit 40 can be decided according to on-site situation; Or can directly be designed to airtight shape sleeve shape; Maybe can be designed to the mesh structure that many connection straps constitute, further preferred version of the present invention is: shown in Fig. 2-3, position-limiting unit 40 comprises and is used for the interior ring 40c that holds the cooperation of 30 bung places, exoergic unit, is arranged at outer shroud 40a that holds 30 tail end places, exoergic unit and the link arm 40b that is used to be connected its inside and outside

ring

40a, 40c anchor ring; The two ends of said link arm 40b are fixed in inside and outside

ring

40a, 40c respectively; At this moment; Its link arm promptly forms " 7 " the word shape shown in Fig. 2-3; Be the end of closing on outer shroud 40b on the ring 40c in the end of said link arm 40b is fixed in, its other end is postponed and is connected the external annulus place of being fixed in outer shroud 40b to outer shroud 40b place along its axis.The present invention is through being provided with the frame-like joint construction of anchor ring up and down, thereby avoided holding exoergic unit 30 as much as possible when expanding and shrink and the friction between position-limiting unit 40 inwalls, thereby guarantees its actual life, guarantees its reliable and stable work all the time.

For realizing the matching relationship in 20 in position-limiting unit 40 and fluid duct; As shown in Figure 1; Postponing to the one of which side in said fluid duct 20 has branch duct 21; The place, aperture in said branch duct 21 is provided with flange part 21a, and end place, position-limiting unit 40 bungs place is correspondingly provided with the flange plate 50 that is mated, and bolt cooperates between the two.

Further, said in ring 40c be provided with countersink region 42 away from the side end face of outer shroud 40a along its axis indent, that is to say, this moment in it ring 40c inner ring surface promptly to constitute ladder poroid; Hold 30 bung places, exoergic unit and be provided with flanging 31, said flanging 31 coincide is embedded at countersink region 42 places and flanging 31 thickness on the position-limiting unit 40 greater than countersink region 42 hole depth settings, specifically as shown in Figure 2.Matching relationship through 31 of above-mentioned countersink region 42 and flangings when actual assembled, can guarantee to hold the position constancy of exoergic unit 30.When position-limiting unit 40 is fixed on the flange part 21a on the fluid duct 20 through flange plate 50; The flanging 31 at 30 bung places, exoergic unit is held in countersink region 42 extruding and the compressing at position-limiting unit 40 bung places; Thereby, guaranteed the steadiness of both relative positions on the one hand through both press fit; Simultaneously; The flanging 31 that its outstanding slightly countersink region 42 ports are provided with; Also played the effect of seal ring, cooperated with the big pressure bolt in fluid duct 20 down at position-limiting unit 30, flanging 31 produces elastic strain and closely is squeezed in the flange part 21a end on the fluid duct 20; Thereby prevent that the leakage problems of its joint gap from appearring in pressure fluid under discharge opeing under the big pressure of the pump housing, its working stability is reliable.

Claims

1. diaphragm metering pump; Comprise the pump housing; The said pump housing is provided with feed liquor duct (10) and fluid duct (20), it is characterized in that: said diaphragm metering pump comprises also and holds exoergic unit (30) that the outlet end that holds exoergic unit (30) is communicated on the fluid duct (20); There are two kinds of working staties in the said exoergic unit (30) that holds: when the pump housing was in the discharge opeing process, exoergic unit (30) absorbed and storage by holding through the segment fluid flow in fluid duct (20); When the pump housing is in the imbibition process, holds fluid that exoergic unit (30) absorbed and discharge and discharge through its outlet end.

2. diaphragm metering pump according to claim 1 is characterized in that: the said exoergic unit (30) that holds holds the exoergic parts for elasticity.

3. diaphragm metering pump according to claim 1 is characterized in that: hold exoergic unit (30) and be the barrel-shaped elastic bellows of cover, its bung place constitutes its outlet end.

4. according to claim 2 or 3 described diaphragm metering pumps, it is characterized in that: holding exoergic unit (30), radially to allow range of expansion be 1～1.2 times, and its axial expansion allowed band is 1～1.5 times.

5. according to claim 2 or 3 described diaphragm metering pumps; It is characterized in that: said diaphragm metering pump also comprises and is nested in the position-limiting unit (40) that holds outer wall place, exoergic unit (30); Position-limiting unit (40) profile is frame-like, and its frame-like surrounds the inner chamber that forms and constitutes the limit chamber (41) that exoergic unit (30) range of expansion is held in restriction.

6. diaphragm metering pump according to claim 5 is characterized in that: position-limiting unit (40) comprises and being used for and the interior ring (40c) that holds the cooperation of bung place, exoergic unit (30), the link arm (40b) that is arranged at the outer shroud (40a) that holds tail end place, exoergic unit (30) and is used to be connected its inside and outside ring (40a, 40c) end face; One end of said link arm (40b) is fixed in the end of closing on outer shroud (40b) on the interior ring (40c), and its other end is located to postpone and be connected the external annulus place of being fixed in outer shroud (40b) to outer shroud (40b) along its axis.

7. diaphragm metering pump according to claim 5; It is characterized in that: postponing to the one of which side in said fluid duct (20) has branch duct (21); The place, aperture of said branch duct (21) is provided with flange part (21a); End place, position-limiting unit (40) bung place is correspondingly provided with the flange plate (50) that is mated, and bolt cooperates between the two.

8. diaphragm metering pump according to claim 6 is characterized in that: the interior ring (40c) on the said position-limiting unit (40) is provided with countersink region (42) away from a side end face of outer shroud (40a) along its axis indent; Hold bung place, exoergic unit (30) and be provided with flanging (31), said flanging (31) coincide be embedded at that countersink region (42) on the position-limiting unit (40) is located and flanging (31) thickness greater than countersink region (42) hole depth setting.