The model utility content
The purpose of this utility model provides a kind of diaphragm metering pump simple in structure, can effectively reduce the pressure pulse in pump housing outlet port, and its working stability is reliable.
For achieving the above object, the utility model has adopted following technological scheme: a kind of diaphragm metering pump, comprise the pump housing, be provided with feed liquor duct and fluid duct on the described pump housing, described 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 described 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 absorbs and discharge and discharge through its outlet end.
Major advantage of the present utility model is: when the pump housing is in the discharge opeing process, by 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 voluntarily more original fluid that absorbs, thereby the continuity that realizes the pump discharge fluid is discharged.The utility model is simple and practical, can effectively reduce the pressure pulse in pump housing outlet port, and its working stability is reliable.
Embodiment
A kind of diaphragm metering pump, comprise the pump housing, be provided with feed liquor duct 10 and fluid duct 20 on the described pump housing, described diaphragm metering pump also comprises and holds exoergic unit 30, the outlet end that holds exoergic unit 30 is communicated on the fluid duct 20, there are two kinds of working staties in the described 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 absorbs 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 considered as sinusoidal words that possess crest and trough, the effect of holding exoergic unit 30 in the utility model, be when the pump housing is in the discharge opeing process, as shown in Figure 7, by 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, holds again retraction or manually discharge original pressure fluid that absorbs voluntarily of exoergic unit, thereby reach the effect that improves the trough value pump pulse; The utility model is by 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, the equipment working stability is reliable.
As further preferred version of the present utility model: shown in Fig. 1-7, the described exoergic unit 30 that holds holds the exoergic parts for elasticity.During actual selecting, its specific implementation can be multiple, such as resilient sleeve, rubber bag etc., as long as can realize the parts of its spring energy storage and automatic exoergic, can realize that all it holds the exoergic operation; Of the present utility model being preferably: hold exoergic unit 30 and be the barrel-shaped elastic bellows of cover, its bung place consists of its outlet end.Like this, when the pump housing is in the discharge opeing process, the piston of driving mechanism is compressed into, the barrier film evagination is also pushed the pressure fluid that is positioned at the main aperture road, this moment, pressure fluid entered fluid duct 20 by one-way valve c, most of pressure fluid flows out by pump discharge, and the fraction pressure fluid is held the exoergic unit and absorbs and store, and holds the exoergic unit this moment and is in as shown in Figure 5 elastic expansion state; When the pump housing is in the imbibition process, backward stroke of the piston, fluid duct 20 internal pressures begin to reduce gradually, until when holding hydrodynamic pressure in the exoergic unit 30 greater than fluid duct 20 fluid pressure, under itself resilient force, hold exoergic unit 30 exoergics, stored fraction pressure fluid flows out by pump discharge in it, 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 following restriction herein: 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.During actual the use, can realize its physics limit function by 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, position-limiting unit 40 profiles are frame-like, and its frame-like encloses the inner chamber that forms and is construed as limiting the limit chamber 41 that holds exoergic unit 30 range of expansion.Certainly, the actual configuration of position-limiting unit 40 can be decided according to on-site situation, or can directly be designed to the closed sleeve-shaped, maybe can be designed to the mesh structure that many connection straps consist of, further preferred version of the present utility model is: shown in Fig. 2-3, position-limiting unit 40 comprise for hold interior ring 40c that 30 bung places, exoergic unit cooperate, be arranged at the outer shroud 40a that holds 30 tail end places, exoergic unit and the link arm 40b that is used for being connected its inside and outside ring 40a, 40c anchor ring; The two ends of described link arm 40b are fixed in respectively inside and outside ring 40a, 40c, at this moment, its link arm namely forms " 7 " the word shape shown in Fig. 2-3, be that the end of described link arm 40b is fixed in the end of closing on outer shroud 40b on the interior ring 40c, its other end is postponed to outer shroud 40b place and is connected the external annulus place of being fixed in outer shroud 40b along its axis.The frame-like of anchor ring connects structure to the utility model by arranging up and down, thereby avoided as much as possible holding exoergic unit 30 when expanding and shrink and the friction between position-limiting unit 40 inwalls, thereby guarantee its actual life, guarantee its all the time reliable and stable work.
For realizing the matching relationship in 20 in position-limiting unit 40 and fluid duct, as shown in Figure 1, postponing to the one side in described fluid duct 20 has branch duct 21, the place, aperture in described 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.
Further, described interior ring 40c is 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 namely to consist of ladder poroid; Hold 30 bung places, exoergic unit and be provided with flanging 31, described flanging 31 coincide is embedded at countersink region 42 places on the position-limiting unit 40 and flanging 31 thickness greater than countersink region 42 hole depth settings, specifically as shown in Figure 2.Matching relationship by 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 was fixed in flange part 21a on the fluid duct 20 when upper by 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 the extruding by both cooperates on the one hand, has guaranteed the steadiness of both relative positions; Simultaneously, the flanging 31 that its slightly outstanding countersink region 42 ports arrange, also played the effect of seal ring, at position-limiting unit 30 with under the large pressure bolt in fluid duct 20 cooperates, flanging 31 generation elastic strains also closely are 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 large pressure of the pump housing, its working stability is reliable.