CN2673397Y

CN2673397Y - Precise metering proportioning pump

Info

Publication number: CN2673397Y
Application number: CN 200320119423
Authority: CN
Inventors: 尹良红
Original assignee: Jinan University
Current assignee: Jinan University; University of Jinan
Priority date: 2003-12-19
Filing date: 2003-12-19
Publication date: 2005-01-26
Anticipated expiration: 2013-12-19

Abstract

The utility model provides a precise metering proportioning pump, comprising a motor, an eccentric cam sheath, a driving piece, a membrane, a pushing rod, a charging valve, a discharging valve and a T-union. The eccentric cam sheath is provided on the shaft of the motor, the driving piece and the pushing rod are respectively connected with the eccentric cam sheath, the membrane and the end part of the driving piece are connected, and the charging valve and the discharging valve are connected with the pushing rod, one end of the T-union and the cavity of the installed membrane are communicated, and the other two ends are respectively connected with the charging valve and the discharging valve. The precise metering proportioning pump is of high control precision, convenient and easy operation, simple, compact and reasonable structure, small volume and low manufacturing cost, and the utility model can be is suitable in hemodialysis equipment. The hemodialysis machine, manufactured on the basis of the technique, has a plurality of advantages of small machine body, compact structure, good mobility, convenient carrying, etc. The utility model has better market outlook.

Description

The delicate metering proportioning pump

Technical field

This utility model relates to a kind of pumping unit, particularly a kind of delicate metering proportioning pump.

Background technology

Hemodialysis be with blood by a kind of small-molecule substance that can only allow (as electrolyte, micromolecule kidney toxin) dialyser made of the semipermeable membrane that passes through, make the side of blood at film, dialysis solution is at the opposite side of film, the solution of both sides is by disperse, osmosis, be that solute is by the high low side flow of a side direction concentration of concentration, allow in the blood in, the micromolecule toxin may penetrate in the dialysis solution, electrolyte also can reach balance by osmosis, thereby realizes the therapy equipment of blood purification purpose.In hemodialysis apparatus, proportioning device is mainly used in the dialysis fluid circuit, sucks the spissated dialysis solution of accurate quantification in proportion, and spissated dialysis solution (A, B liquid) is mixed with the reverse osmosis water, forms to wait to ooze the dialysis solution of standard and enter dialyser.Simultaneously, proportioning pump also is used for the ultrafiltration of dialysis fluid circuit, and the degree of accuracy of ultrafiltration volume directly influences the therapeutic effect of dialysis, utilizes this proportioning pump can extract the liquid of accurate quantification out in equilibrated dialysis fluid circuit, thereby reaches accurate Ultrafiltration.

The existing proportioning device that is used for control dialysis solution turnover dialyser ratio on the dialysis fluid circuit mainly is a membrane pump, disclose a kind of " efficiently measuring membrane pump " in the patent No. is 01245153.3 Chinese utility model, this membrane pump is made up of motor, motor cabinet, transmission case, pump head, inlet valve, bleeder valve, piston rod, diaphragm and flow control device etc.; When this membrane pump was worked, piston rod drove diaphragm and moves back and forth, and the volume of pump head cavity is changed, and under the cooperation of unidirectional charging and discharging valve, when volume increases, produced negative pressure in the pump head, and slurry sucks pump head by inlet valve; When volume reduced, slurry was oppressed by diaphragm, produced malleation, made slurry discharge pump head by bleeder valve.Above-mentioned membrane pump adopts two check valves to come the flow direction of controlling liquid, and adopt eccentric wheel apparatus commonly used to drive linkage, two check valves of this membrane pump are in the water-in and water-out process, because the valve ball of check valve is closed under the effect of spring and is needed the regular hour, also can cause the backflow of slurry in the leakage of slurry in the pump head cavity or the check valve outside to pump head cavity even required time is short, the slurry ratio that so just causes sucking and discharge pump head cavity is inconsistent, thereby makes its control accuracy accurate inadequately.This membrane pump can be used to measure transmit general to the less demanding slurry of quantitative accuracy, but the dialysis solution proportion control process of having relatively high expectations for measuring accuracy, this membrane pump is also inapplicable.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming that prior art exists, a kind of degree of accuracy height, simple in structure, easy control, safe and reliable, stability height are provided, meet medical use standard, can be applicable to the delicate metering proportioning pump of control dialysis solution turnover dialyser ratio in the hemodialysis.

The purpose of this utility model is achieved through the following technical solutions: this delicate metering proportioning pump comprises motor, eccentric cam cover, driving member, barrier film, push rod, inlet valve, bleeder valve, three way cock, each position component and annexation are: the eccentric cam cover is arranged in the rotating shaft of motor, driving member and push rod are connected with the eccentric cam cover respectively, the end of barrier film and driving member is connected, inlet valve and bleeder valve are connected with push rod respectively, three way cock's a end with membranous cavity be set be connected, two ends are connected with inlet valve and bleeder valve respectively in addition.

Described eccentric cam cover comprises arrangement vertically and (two cams can be integrated with axial vertical two cams, also can be and separate independently two versions that cam links together by connector), a cam section is circular, and the central shaft of eccentric cam cover is departed from its circular center of circle; The contour line of another cam is identical by the center of circle but two sections circular arcs that radius does not wait are formed by connecting by transition wire, and the central shaft of the center of circle of described another cam and eccentric cam cover coincides.

Two cams of described eccentric cam cover are decided on the relative position of inlet valve and bleeder valve at circumferential relative position; For the situation that has angle between inlet valve and the bleeder valve and be provided with, also become identical angle setting between the salient point of two cams of eccentric cam cover, as state for the relative 180 ° of settings of inlet valve with bleeder valve, the also relative 180 ° of settings of salient point of two cams of eccentric cam cover.

Described eccentric cam cover end is provided with eccentric shaft, and described eccentric shaft is oppositely arranged according to the centre-of gravity shift aspect that former eccentric cam overlaps, and is used to make eccentric cam cover smooth rotation and can not produces the phenomenon of centrifugal swing.

Described driving member is a drive link, and described drive link includes a square framework that matches and be connected with the cam of eccentric cam cover, and the lower end of square framework connects barrier film.

Described driving member also can include diaphragm spindle, and an end of diaphragm spindle and the lower end of drive link are by being threaded, and the other end of diaphragm spindle is fixedlyed connected with barrier film.

Described driving member also can include push rod, one end of described push rod stretches in the square framework, can with the cam apical grafting of eccentric cam cover, the other end is connected with adjusting nut, be used to regulate push rod and stretch into the intravital length of square box, thereby the amplitude of fluctuation of a tunable integer driving member is the amount of suction of scalable barrier film and drain like this.

One end of described push rod links rotary roller, and the other end is fixedly connected with the sealing-plug of inlet valve or bleeder valve, is socketed with back-moving spring on push rod, and an end apical grafting of back-moving spring is on the boss of push rod, and other end apical grafting is on stake body.

Described push rod also can be provided with buffer structure, described buffer structure comprises depression bar, buffer spring, spring base, depression bar one end links described roller, on the other end crimp spring seat, be provided with cavity in the depression bar, buffer spring is installed in the cavity, the buffer spring apical grafting is on the boss of described push rod, the end of described push rod is stretched in the interior cavity of depression bar and is connected with buffer spring, part outside push rod is positioned at the depression bar cavity is by cooperate the be movably connected spring base of pin with cotter way, the boss two ends of described spring base simultaneously with depression bar and back-moving spring apical grafting mutually.The buffer structure that is increased can make push rod become flexible structure by rigid structure, has avoided causing because impulsive force is excessive the locked of sealing-plug one end, and softer active force also can reduce the rate of wear of sealing-plug simultaneously, prolongs the service life of parts.

Described inlet valve or bleeder valve comprise an inlet and a liquid outlet, one of them is communicated to inlet valve or the interior cavity of bleeder valve vertically inlet and liquid outlet, another is along the cavity that circumferentially is communicated in inlet valve or the bleeder valve, and the sealing-plug that is connected with push rod stretches in the cavity in inlet valve or the bleeder valve; When sealing-plug did not stretch in the described cavity fully, inlet and liquid outlet were in connected state; When described sealing-plug stretches into described cavity bottom and contacts with the bottom when fitting, inlet and liquid outlet are in not connected state.

Be provided with the sealing strip of projection around the bottom inlet of described inlet valve or bleeder valve or the liquid outlet, sealing-plug only needs the sealing strip of the described projection of crimping can realize sealing to bottom inlet or liquid outlet; Because the relation that pressure and active area are inversely proportional to is compared with the model of action of the whole bottom of fitting, the less active area of sealing strip can be realized better sealing effectiveness.

Described motor is a motor.

Mechanism of the present utility model is: when this delicate metering proportioning pump is worked, the circular offset cam of eccentric cam cover is rotated under the driving of motor, can correspondingly drive driving member and make steady linear reciprocating motion, the volume of barrier film cavity 14 inside is changed, discharge or suck liquid thereby can produce positive and negative pressure; Simultaneously, rotate synchronously because eccentric cam puts another cam and the circular offset cam of setting, and another cam can realize successively that in rotating process (1) inlet valve closes, bleeder valve closes; (2) inlet valve leaves, bleeder valve closes; (3) inlet valve pass, bleeder valve close; Several states such as (4) inlet valve closes, bleeder valve leaves, so when inlet valve and bleeder valve with after barrier film cavity 14 is communicated with, can realize that under the driven in synchronism of two cams of eccentric cam cover equal proportion transports the effect of liquid, this delicate metering proportioning pump be inserted in the dialysis fluid circuit of hemodialysis and can carry out high-precision dialysis solution proportion control.

This utility model has following advantage and effect with respect to prior art: (1) control accuracy height; Because this delicate metering proportioning pump has been done improvement to the version and the model of action of inlet valve and bleeder valve, realized fully independently mode of operation of the suction of the liquid of carrying and discharge process, guaranteed the high accuracy that liquid quantitative is carried, thereby overcome switch that existing membrane pump adopts the check valve control model to exist fully and make more slowly, easily and to carry leak of liquid to cause the accurate inadequately shortcoming of control accuracy; (2) easy to operate; Because this delicate metering proportioning pump has used the eccentric cam cover to realize carrying the automatic control of liquid process, quality of fit height between each parts, synchronicity is good, processes such as feed liquor, discharge opeing and switching thereof can carry out and not need to add any signal controlling automatically, control simple more, convenience, automaticity height thereby make; (3) simple in structure, compact, reasonable, volume is little, low cost of manufacture; This utility model manufacturing process is comparatively simple, because the corresponding minimizing of its volume, so its manufacturing cost is lower, based on the hemodialysis apparatus of this technical foundation manufacturing have that body is little, compact conformation, mobility are good, carry plurality of advantages such as convenient, good market prospect.

Description of drawings

Fig. 1 is the structural representation of this utility model delicate metering proportioning pump.

Fig. 2 is the left view of delicate metering proportioning pump shown in Figure 1.

Fig. 3 is the structural representation of the eccentric cam cover in the delicate metering proportioning pump shown in Figure 1.

Fig. 4 is the left view of eccentric cam cover shown in Figure 3.

Fig. 5 is the structural representation of driving member shown in Figure 1.

The specific embodiment

Below in conjunction with embodiment and accompanying drawing this utility model is done further concrete description, but of the present utility model

Embodiment is not limited thereto.

Embodiment

Fig. 1～Fig. 5 shows concrete structure of the present utility model, by Fig. 1 and Fig. 2 as seen, this delicate metering proportioning pump comprises motor 12, motor cabinet 4, eccentric cam cover 5, driving member 8, push rod 7, stake body 10, inlet valve 6, bleeder valve 9, barrier film 11, pump cover 2, the pump housing 3, the three way cock 1, each position component and annexation are: pump cover 2 is entrenched togather formation barrier film cavity 14 with the pump housing 3, barrier film 11 is installed in the barrier film cavity 14, its periphery is by pump cover 2 and the pump housing 3 chimeric compressing, barrier film cavity 14 has balance pipe 13 and is used in the counter balance pocket, outer air pressure, the pump housing 3 is provided with motor cabinet 4, motor 12 is installed on the motor cabinet 4, eccentric cam cover 5 is connected in the rotating shaft of motor 12, driving member 8 is installed on the motor cabinet 4, push rod 7 is installed on the stake body 10, stake body 10 also is connected on the motor cabinet 4, driving member 8 is connected with eccentric cam cover 5 respectively with push rod 7, described barrier film 11 is connected with the end of driving member 8, inlet valve 6 and bleeder valve 9 are connected with push rod 7 respectively, an interface of three way cock 1 is connected with the barrier film cavity 14 that barrier film 11 is installed, and two interfaces are connected by pipeline (not shown in the accompanying drawing) with inlet valve 6 and bleeder valve 9 respectively in addition.

The shape of described eccentric cam cover 5 and structure are as shown in Figure 3 and Figure 4, as seen from Figure 3, eccentric cam cover 5 comprise arrange vertically and with axially vertical two cam 5-1,5-2, two cam 5-1,5-2 are integrated, the cross section of its cam 5-2 is circular, and its circular center of circle B departs from the central shaft A of eccentric cam cover; The contour line of another cam 5-1 is identical by the center of circle but two sections circular arc 5-1-1,5-1-2 that radius does not wait are formed by connecting by transition wire 5-1-3, the central shaft A of the center of circle of cam 5-1 and eccentric cam cover 5 coincides, and two cam 5-1,5-2 of eccentric cam cover 5 decide on the relative position of inlet valve 6 and bleeder valve 9 at circumferential relative position; For the state (as present embodiment) of inlet valve 6 with bleeder valve 9 relative 180 ° of settings, the also relative 180 ° of settings of salient point C, D of two cam 5-1,5-2 of eccentric cam cover 5.The end of this eccentric cam cover 5 also is provided with eccentric shaft 5-3, and described eccentric shaft 5-3 is oppositely arranged according to the centre-of gravity shift aspect of former eccentric cam cover 5, is used to make eccentric cam to overlap 5 smooth rotation and can not produces the phenomenon of centrifugal swing.

The cam 5-2 of described driving member 8 and eccentric cam cover 5 transmission that matches, the structure of driving member 8 as shown in Figure 5, as seen from Figure 5, described driving member 8 comprises drive link 8-1, diaphragm spindle 8-2, push rod 8-3, drive link 8-1 includes a square framework 8-1-1 who matches and be connected with cam 5-2, the lower end of drive link 8-1 is connected by screw thread with diaphragm spindle 8-2, and the other end of diaphragm spindle 8-2 is fixedlyed connected with barrier film 11; The square framework 8-1-1 upper end of drive link 8-1 is connected with push rod 8-3, the end of push rod 8-3 stretches in the square framework 8-1-1 and cam 5-2 apical grafting, the other end is threaded with adjusting nut 8-4, by adjusting the position of adjusting nut 8-4, can regulate push rod 8-3 and stretch into the interior length of square framework 8-1-1, thereby the amplitude of fluctuation of a tunable integer driving member 8, thereby be the amount that the amplitude of scalable barrier film 11 swing is regulated its suction and drain like this.

The cam 5-1 of described push rod 7 and eccentric cam cover 5 transmission that matches, push rod 7 comprises rotary roller 7-1, depression bar 7-2, buffer spring 7-3, spring base 7-4, push rod main body 7-5, back-moving spring 7-6, roller 7-1 apical grafting is on cam 5-1, transmission contacts with cam 5-1, the end of depression bar 7-2 links roller 7-1, the other end is crimped on the spring base 7-4, be provided with cavity in the depression bar 7-2, buffer spring 7-3 is installed in the cavity, buffer spring 7-3 apical grafting is on the boss 7-7 of the push rod main body 7-5 that is positioned at cavity, push rod main body 7-5 is positioned at the outer part of depression bar 7-2 cavity by pin 7-8 and the spring base 7-4 that has been movably connected cooperating of cotter way 7-9 (pin 7-8 and spring base 7-4 relative fixed, pin 7-8 also can slide in cotter way 7-9), the boss two ends of described spring base 7-4 simultaneously with depression bar 7-2 and back-moving spring 7-6 apical grafting mutually, the other end apical grafting of back-moving spring 7-6 is on stake body 10.

Described inlet valve 6 is identical with the structure of bleeder valve 9, with bleeder valve 9 is that example illustrates its construction features, as seen from Figure 1, bleeder valve 9 comprises an inlet 9-2 and a liquid outlet 9-3, liquid outlet 9-3 is communicated among the cavity 9-4 in the bleeder valve 9 vertically, inlet 9-2 is along among the cavity 9-4 that circumferentially is communicated in the bleeder valve 9, and the sealing-plug 9-1 that is connected with push rod main body 7-5 stretches in the interior cavity 9-4 of bleeder valve 9; In the time of in sealing-plug 9-1 does not stretch into described cavity 9-4 fully, inlet 9-2 and liquid outlet 9-3 are in connected state; When contacting applying bottom sealing-plug 9-1 stretches into described cavity 9-4 and with the bottom, inlet 9-2 and liquid outlet 9-3 are in not connected state.Be provided with the sealing strip 9-5 of projection around the bottom liquid outlet 9-3 of bleeder valve 9, sealing-plug 9-1 only needs the sealing strip 9-5 of the described projection of crimping can realize sealing to bottom liquid outlet 9-3; Because the relation that pressure and active area are inversely proportional to is compared with the model of action of the whole bottom of fitting, the less active area of sealing strip 9-5 can be realized better sealing effectiveness.

Mechanism of the present utility model is: when this delicate metering proportioning pump is worked, the circular offset cam 5-2 of eccentric cam cover 5 rotates under the driving of motor 12, can correspondingly drive driving member 8 and make linear reciprocating motion stably, the volume of barrier film cavity 14 inside is changed, discharge or suck liquid thereby can produce positive and negative pressure; Simultaneously, because the cam 5-1 and the circular offset cam 5-2 that are provided with on the eccentric cam cover 5 rotate synchronously, and cam 5-1 can realize successively that in rotating process (1) inlet valve 6 closes, bleeder valve 9 closes (when the circular arc 5-1-1 of cam 5-1 contacts with the roller of inlet valve 6 and bleeder valve 9 simultaneously); (2) inlet valve 6 leaves, bleeder valve 9 closes (when the circular arc 5-1-2 of cam 5-1 contacts with the roller of inlet valve 6 and circular arc 5-1-1 when contacting with the roller of bleeder valve 9), and at this moment liquid is inhaled into barrier film cavity 14; (3) inlet valve 6 passes, bleeder valve 9 close (when the circular arc 5-1-1 of cam 5-1 contacts with the roller of inlet valve 6 and bleeder valve 9 simultaneously), and the liquid that has at this moment sucked is full of barrier film cavity 14; (4) inlet valve 6 closes, bleeder valve 9 leaves (when the circular arc 5-1-1 of cam 5-1 contacts with the roller of inlet valve 6 and circular arc 5-1-2 when contacting with the roller of bleeder valve 9), and at this moment the liquid in the barrier film cavity 14 is from bleeder valve 9 discharges; (5) inlet valve 6 passes, bleeder valve 9 close, and at this moment liquid is emptied completely from barrier film cavity 14; Act on the fluid handling that can carry out accurate quantification again and again by these several on-off modes; So when inlet valve 6 and bleeder valve 9 are communicated with barrier film cavity 14, can realize that under the driven in synchronism of two cam 5-1,5-2 of eccentric cam cover 5 equal proportion transports the effect of liquid, this delicate metering proportioning pump be inserted in the dialysis fluid circuit of hemodialysis and can carry out high-precision dialysis solution proportion control.

Claims

1, a kind of delicate metering proportioning pump, it is characterized in that: comprise motor (12), eccentric cam cover (5), driving member (8), barrier film (11), push rod (7), inlet valve (6), bleeder valve (9), three way cock (1), eccentric cam cover (5) is arranged in the rotating shaft of motor (12), driving member (8) and push rod (7) are connected with eccentric cam cover (5) respectively, barrier film (11) is connected with the end of driving member (8), inlet valve (6) and bleeder valve (9) are connected with push rod (7) respectively, three way cock's (1) a end is connected with the cavity that barrier film (11) is set, and two ends are connected with inlet valve (6) and bleeder valve (9) respectively in addition.

2, delicate metering proportioning pump according to claim 1, it is characterized in that: described eccentric cam cover (5) comprise vertically arrange and with axial vertical two cams (5-1,5-2), a cam (5-2) cross section is circular, and the central shaft of eccentric cam cover (5) is departed from its circular center of circle; The contour line of another cam (5-1) is identical by the center of circle but two sections circular arcs (5-1-1,5-1-2) that radius does not wait are formed by connecting by transition wire (5-1-3), and the central shaft of its center of circle and eccentric cam cover (5) coincides.

3, delicate metering proportioning pump according to claim 2, it is characterized in that: two cams (5-1,5-2) of described eccentric cam cover (5) at circumferential relative position are: situation about being provided with for having angle between inlet valve (6) and the bleeder valve (9) also becomes identical angle setting between the salient point of two cams (5-1,5-2) of eccentric cam cover (5).

4, delicate metering proportioning pump according to claim 3 is characterized in that: for the state of inlet valve (6) with the relative 180 ° of settings of bleeder valve (9), and the also relative 180 ° of settings of salient point of two cams (5-1,5-2) of eccentric cam cover (5).

5, according to claim 2 or 3 described delicate metering proportioning pumps, it is characterized in that: described eccentric cam overlaps 5 ends and is provided with eccentric shaft (5-3).

6, delicate metering proportioning pump according to claim 1 is characterized in that: described driving member (8) is a drive link, includes a square framework (8-1-1) that matches and be connected with the cam (5-2) of eccentric cam cover (5).

7, delicate metering proportioning pump according to claim 6, it is characterized in that: described driving member (8) comprises diaphragm spindle (8-2), one end of diaphragm spindle (8-2) and the lower end of drive link are by being threaded, and the other end of diaphragm spindle (8-2) is fixedlyed connected with barrier film (11).

8, delicate metering proportioning pump according to claim 6, it is characterized in that: described driving member (8) comprises push rod (8-3), one end of described push rod (8-3) stretches in the square framework (8-1-1), with cam (5-2) apical grafting of eccentric cam cover (5), the other end is connected with adjusting nut (8-4).

9, delicate metering proportioning pump according to claim 1, it is characterized in that: described push rod (7) is provided with buffer structure, described buffer structure comprises depression bar (7-2), buffer spring (7-3), spring base (7-4), depression bar (7-2) end links roller (7-1), on the other end crimp spring seat (7-4), be provided with cavity in the depression bar (7-2), buffer spring (7-3) is installed in the cavity, buffer spring (7-3) apical grafting is positioned at part outside depression bar (7-2) cavity in the push rod main body (7-5) of push rod (7) and cooperates the spring base that has been movably connected (7-4) by pin (7-8) and cotter way (7-9) on the boss (7-7) of push rod (7).

10, delicate metering proportioning pump according to claim 1 is characterized in that: the sealing strip (9-5) that is provided with projection around the bottom inlet of described inlet valve (6) or bleeder valve (9) or the liquid outlet.