CN114352507A - Continuous precision metering fluid pump - Google Patents
Continuous precision metering fluid pump Download PDFInfo
- Publication number
- CN114352507A CN114352507A CN202111545642.6A CN202111545642A CN114352507A CN 114352507 A CN114352507 A CN 114352507A CN 202111545642 A CN202111545642 A CN 202111545642A CN 114352507 A CN114352507 A CN 114352507A
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- Prior art keywords
- roller
- fluid
- rollers
- hoses
- hose
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- Pending
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- 239000012530 fluid Substances 0.000 title claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract 3
- 238000003825 pressing Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 8
- 230000000295 complement effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 230000002572 peristaltic effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Reciprocating Pumps (AREA)
Abstract
The invention relates to a pump capable of continuously and precisely metering and conveying fluid. The invention adopts a roller wheel with uniformly distributed cylindrical rollers on the circumference to extrude a hose for conveying fluid to push the fluid in the hose; making the output flow-time working curve be a sine curve; the phase difference of the sinusoidal working curves of two identical hoses is pi (namely 1/2 cycles), and the fluids output by the two hoses are combined, so that the function of outputting the fluids (liquid flow or air flow) which can be precisely metered and can be infinitely conveyed can be realized.
Description
Technical field machinery/chemical industry automatic control machinery/fluid metering pump.
Technical background precision metering pumps commonly used in instruments such as autotitrators generally use the following operating principle: the fluid is drawn in and out by a screw driving a piston in a cylindrical container, similar to the principle of a pump, pump or medical injector. Such metering pumps can only draw a certain amount of fluid at a time and then output it, and cannot be used for continuous delivery of fluid. To ensure sufficient accuracy, the cross-sectional area of the cylindrical container cannot be very large and its length is limited, so that the total amount of fluid that can be delivered at one time by such a pump is limited.
In the case of continuous or random multiple fluid delivery, a peristaltic pump (such as a hospital infusion pump) is usually used, which extrudes the fluid from the tube by pressing a plurality of cylindrical rollers against the tube. The input port of the hose is connected to a reservoir for storing fluid. The total amount of fluid that can be delivered by the peristaltic pump is not limited, and can be virtually unlimited, as long as there is sufficient fluid in the container in which the fluid is stored. However, the output of the peristaltic pump is not uniform and stable, and the flow-time working curve of the fluid is in a pulsating fluctuation. This is clearly not suitable for purposes where precise metering is required.
The invention relates to a pump which can not only carry out precise metering but also can continuously convey fluid in an unlimited amount, and has simple structure and reliable work. The structure and the operation principle of the invention are as follows:
the plurality of cylindrical rollers are uniformly distributed on the circumference of one roller. On a section of the periphery of the roller, there is a circular arc shaped press block adapted to the roller, and the length of the press block should span at least three rollers. The inner side of the pressing block is provided with a groove. The groove is embedded with a thick-wall hose with good elasticity and is extruded by the roller and the peripheral pressing block. When the roller rolls, the roller continuously extrudes and pushes the fluid forwards, and the function of infinitely conveying the fluid can be realized. This is the principle of operation of a typical peristaltic pump. The hose is periodically collapsed and inflated while the pump is running. By selecting the diameter and spacing of the rollers, and the inner and outer diameters of the hose, the flow-over-time operating curve of the fluid output can be made to be (or approximate to) sinusoidal. The selection of the roller and hose parameters is described below under "detailed description".
The difference with the ordinary peristaltic pump is that the invention adopts two parallel hoses with identical sinusoidal working curves, which are respectively embedded into two grooves, so that the phase difference of the two sinusoidal working curves is pi, namely 1/2 cycles. The method of causing the phase difference is described below in the detailed description. The fluid output by the two hoses is combined, the phase difference between the two hoses is 1/2 cycles, the working curve is changed into a sine curve and a cosine curve from two sine curves at the same time starting point, the wave crest and the wave trough are exactly compensated with each other, so that a flow-time working curve which is very similar to a straight line is obtained, and the accurate and precise linear relation is formed between the output quantity of the fluid and the rolling quantity of the roller. Therefore, the invention can realize the purposes of accurate and precise metering and fluid conveying.
The invention has the characteristics that the peristaltic pump can continuously or randomly convey fluid for many times, and the total quantity of the conveyed fluid is not limited, and overcomes the defect of fluctuation of the output of the peristaltic pump, so the invention has the functions of continuous, infinite and precise metering.
The roller is driven by a motor. The motor can be connected in an automatic control system, and the operation of the motor is controlled by the instruction of the system, so that the online automatic control is realized. The information of the running amount (such as the rotating angle or time of the roller) is fed back to the system and converted into the fluid output amount. The system can also read data (such as potential, concentration and pH value of a chemical reaction system) from a servo terminal, and perform online comparison and judgment with set values of a program so as to give a next step instruction, such as: adjusting the delivery rate, terminating the reaction, calculating and reporting the measured substance content of the sample, moving to the next procedure sub-module, and so on. In order to realize high-precision control, a stepping motor can be used for driving the roller, the operation amount of the roller is directly controlled by instruction codes, and the digitization of the fluid conveying precision control is realized.
The invention is suitable for occasions requiring precise quantification and long-time uniform fluid delivery. For example, the following uses:
1. automatic titrators for use in automatic measuring instruments such as chemical or electrochemical volumetric analysis, and the like;
2. the servo mechanism is used for an automatic production system of chemical industry, medicine, food and the like as an accurate servo mechanism for adding and conveying fluid materials;
3. the sampling device is used for long-time precise quantitative sampling of air, water and other fluids in environment and industrial hygiene detection work, and replaces multiple times of sampling of limited discrete time points so as to more accurately reflect the environment quality and the industrial hygiene condition of the working environment.
Drawings
The attached figure 1 of this specification is the attached figure of the abstract of this specification.
FIG. 1 is a schematic view of the operating principle of a peristaltic pump
In the drawings
1- -briquetting
2- -flexible pipe
3- -roller
r- -is the radius of the roller
k-is the number of rollers evenly distributed on the circumference of the roller.
FIG. 2 second method for creating a phase difference between the output working curves of two hoses
Two grooves are arranged on the same pressing block, the position difference of the tail ends of the two grooves corresponds to pi/k radian of the circumference of the rolling roller, and k is the number of the rollers uniformly distributed on the circumference of the rolling roller.
FIG. 3 shows a third method for creating a phase difference between the output working curves of two hoses
Schematic diagram of two circles of rollers (local) uniformly distributed on the roller. The diameters and the distances of the two circles of rollers are completely the same, but the distribution on the circumference of the roller is staggered by pi/k radians (the central lines of two adjacent rollers on the two circles are staggered by pi/k radians), and k is the number of the rollers uniformly distributed on the circumference of the roller.
Typical examples of the specific embodiments: a pump body which consists of a roller component, a pressing block with two grooves, two hoses, a driving motor and other key components. The roller member and the pressing block can be opened and closed and are fixed by bolts associated with the shell. The precise position and degree of compression can be adjusted by corresponding countersunk set screws and tightened by countersunk set screws. The shaft hole of the roller can be directly assembled with the power output shaft of the motor and fastened through a key and a key groove, and a variable speed transmission device can also be arranged between the roller and the motor.
The choice of roller diameter and spacing and hose inner and outer diameters, for which the flow-time operating curve of the fluid output is sinusoidal, is not unique and can be determined experimentally. A reference example is provided below, such as the order:
2πr/k＝(1±a)d，Φ1＝(1±a)×3d/4，0≤a≤0.3
where r is the radius of the roller, k is the number of rollers uniformly distributed on the circumference of the roller, d is the diameter of the rollers, phi1The inner diameter of the hose.
The phase difference between the two hose output operating curves can be achieved by any one of three methods:
the first method comprises the following steps: the two hoses are respectively extruded by two pressing blocks with grooves. The tail ends of the grooves of the two pressing blocks are spaced from the rolling circumference of the roller by pi/k radians, and k is the number of the rollers uniformly distributed on the roller. Note that: the termination location of the trench is critical.
The second method comprises the following steps: two grooves are arranged on the same pressing block, but the tail ends of the two grooves are spaced from the circumference of the rolling roller by pi/k radians, wherein k is the number of the rollers uniformly distributed on the roller. The grooves terminate with the compact so that the ends of the left and right halves of the compact are not at the same location.
The third method comprises the following steps: two grooves on the same pressing block are completely the same, but double rows of rollers are uniformly distributed on the roller wheel and respectively correspond to the two hoses. The distribution of two rows of rollers is staggered with pi/k radian, wherein k is the number of rollers uniformly distributed on the roller.
Merging of the two hose output fluids: a tee fitting (e.g., a Y-fitting) may be used to connect them to the output manifold.
The material of the roller, the roller and the pressing block can adopt the material with better hardness and better machining performance, such as carbon steel, stainless steel, titanium alloy, aluminum-magnesium alloy, copper alloy and some engineering plastics such as ABS, nylon and the like. The rollers may also be made of polytetrafluoroethylene. The roller surface should have a mirror finish. The surface of the groove of the pressing block is not too smooth, and is preferably processed into a ground glass shape by a surface treatment technology so as to increase the adhesive force between the pressing block and the hose.
The hose can be made of any material with good flexibility, good elasticity and fatigue resistance, such as latex, silicon rubber and the like. For the delivery of food, beverages and pharmaceuticals, non-toxic food grade materials should be used.
The hardware and programs required for the automatic control can be known in the art.
Claims (1)
1. A continuous precision metering fluid pump capable of continuous, unlimited delivery and precision metering characterized by:
(1) the fluid includes liquids and gases (excluding gas-liquid mixtures, supercritical fluids);
(2) when the source of the fluid is not limited, the amount of the fluid which can be continuously conveyed or conveyed for multiple times by the continuous precision metering fluid pump is also not limited;
(3) the flow-time working curve of the fluid output by the continuous precise metering fluid pump is (or is very similar to) a straight line, and the amount of the fluid conveyed by the continuous precise metering fluid pump has an accurate and precise linear relation with the operation of the pump, so that uniform and stable fluid conveying and precise metering can be realized;
(4) the continuous precision metering fluid pump is internally provided with a circular roller, and a plurality of cylindrical rollers are uniformly distributed on the circumference of the circular roller;
(5) the outer side of one section of the circumference of the round roller is provided with a circular arc-shaped pressing block matched with the circular arc of the round roller, the pressing block has a span spanning at least three rollers, and the inner side of the pressing block facing the roller is provided with a groove along the circumference;
(6) two identical parallel hoses are arranged in the continuous precise metering fluid pump, each hose has a section which is arranged in the groove of the pressing block, and the hose in the groove is extruded by the roller and is pushed to move forwards by rolling of the roller, so that the function of fluid delivery is realized;
(7) the two hoses in the characteristic (6) have the flow-time working curves of conveying fluid which are both (or are very similar to) a sine curve;
(8) the flow-time working curve of the fluid conveyed by the hose is (or is very similar to) a sine curve, and is realized by selecting and/or adjusting parameters of the diameter of the rollers, the distance between the rollers, the inner diameter of the hose and the wall thickness of the hose;
(9) the characteristic (3) is that the flow-time working curve which is (or is very similar to) a straight line is obtained by combining the fluids conveyed by two hoses of which the phase difference of the working curves is pi (namely a half period) so as to make the two flow-time working curves of which the phase difference is pi complementary;
(10) the phase difference of the flow-time working curves of the two hoses is pi, and the method is realized by one of the following three methods:
the first method comprises the following steps: the two hoses are respectively extruded by two pressing blocks with grooves, the tail ends of the grooves on the two pressing blocks are spaced at intervals of (2n-1) pi/k radians on the rolling circumference of the roller (in the formula, k is the number of the rollers uniformly distributed on the roller, and n is a positive integer),
the second method comprises the following steps: two grooves are arranged on the same pressing block, but the tail ends of the two grooves are spaced from the circumference of the rolling roller by pi/k radians (wherein k is the number of the rollers uniformly distributed on the roller),
the third method comprises the following steps: two grooves on the same pressing block are completely the same, but the rollers are uniformly distributed with double rows of rollers which respectively correspond to the two hoses, and the two rows of rollers are staggered from pi/k radians (in the formula, k is the number of rollers uniformly distributed on the rollers).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545642.6A CN114352507A (en) | 2021-12-16 | 2021-12-16 | Continuous precision metering fluid pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111545642.6A CN114352507A (en) | 2021-12-16 | 2021-12-16 | Continuous precision metering fluid pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114352507A true CN114352507A (en) | 2022-04-15 |
Family
ID=81099059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111545642.6A Pending CN114352507A (en) | 2021-12-16 | 2021-12-16 | Continuous precision metering fluid pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114352507A (en) |
Citations (23)
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|---|---|---|---|---|
| GB1076257A (en) * | 1963-08-14 | 1967-07-19 | Marshall And Blackman Engineer | Improvements in or relating to flexible tube pumps |
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-
2021
- 2021-12-16 CN CN202111545642.6A patent/CN114352507A/en active Pending
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Application publication date: 20220415 |
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