HYDRAULIC POSITIVE DISPLACEMENT DEVICE FOR LIQUID PUMPING AND/OR METERING

Abstract

The invention relates to devices for transferring or dispensing liquids. Hydraulic positive-displacement device for pumping and/or dispensing fluids, comprising of a working chamber in which the working body is placed, is characterized by the working body made of a composite of at least two parts the first of whichthe outside is made of sapphire, and its outer surface is congruent to the interior surface of the working chamber, the second item is placed in the inner cavity of the first part and configured to transmit the translational motion of the working body. The invention reduces the surface roughness of the working body, simplifying the process of replacing individual parts of the unit and extends the range of geometrical sizes of devices that can be manufactured.

Claims

1. Hydraulic positive-displacement device for pumping and/or dispensing fluids, comprising a working chamber in which the working body is placed, is characterized by the working body made of a composite of at least two parts the first of whichthe outside is made of sapphire, and its outer surface is congruent to the interior surface of the working chamber, the second item is placed in the inner cavity of the first part and configured to transmit the translational motion of the working body.

2. Device according to claim 1, is characterized in that the operating element is a plunger,

3. Device according to claim 1, is characterized in that the actuator is a piston.

4. Device of claim 1, is characterized in that the first part is formed detachably from the second part.

5. Device of claim 1, characterized in that the first part has a longitudinal sectional U-shaped.

6. Device of claim 1, is characterized in that the inner surface of the first member outer surface is congruent to the second member.

7. Device of claim 1, is characterized in that the first part is pressed onto the second one.

8. Device of claim 1, is characterized in that the outer surface of the first part machined to the roughness of 5 angstroms.

9. Device of claim 1, is characterized in that the inner surface of the working chamber is made of sapphire.

10. Device of claim 9, is characterized in that the working chamber surface roughened 5 Angstroms.

11. Device of claim 1, is characterized in that the second part is made of metal,

12. Device of claim 1, is characterized in that the actuator further comprises a gate formed from a composite of at least two parts of which the firstexterior is made of sapphire, and its outer surface is congruent to the internal the surface of the working chamber, the second item is

Description

DRAWINGS

[0023] FIG. 1Section of the working body with the leucosapphire glass;

[0024] FIG. 2View of the hydraulic device from the slide;

[0025] FIG. 3Section of the hydraulic unit assembly.

[0026] FIG. 1 shows the working bodyplunger, piston or slide consisting of the first part (9)leucosapphire glass and the second part (10). FIG. 2, 3 show the working body of the hydraulic unit assembly, which comprises the following components: housing (1), fork (2); plunger or piston (3), discharge channel (4), supply channel (5), slide (6), rod (7), working chamber of the hydraulic unit (8).

DETAILED DESCRIPTION OF INVENTION

[0027] The main idea and importance of the technical solution is fast, not time-consuming, cheap replacement of the first leucosapphire part, in the event of wearing, damage, failure with the new leucosapphire part. In similar pistons and plungers, the plunger itself consists a single integrated structure in the case of wearing or damage, the entire pump or metering unit is fully replaceable. It is very expensive, time consuming and not cost-effective.

[0028] Hydraulic positive-displacement unit for liquid pumping and/or metering, comprising a working chamber in which the working body is placed, is characterized by working body formation as a composite of at least two parts, the first of which (glass) is external and is made of leucosapphire, and its outer surface is congruent to the interior surface of the working chamber, the second part is placed in the inner cavity of the first part and is configured to transmit the translational motion to the working body. [0029] The working body is a plunger. [0030] The working body is a piston. [0031] The unit additionally comprises a working body in the form of slide, it is a composite of at least two parts, the first of which (the glass) is the outer and is made of leucosapphire, and its outer surface is congruent to the interior surface of the working chamber, the second part is placed in the inner cavity of the first part and is configured to transmit rotary motion to the working body. [0032] The first part is removable from the second part. [0033] The first part in the longitudinal section is U-shaped, [0034] The inner surface of the first part is congruent to the outer surface of the second part. [0035] The first part is pressed to the second one. [0036] The outer surface of the first part is machined to the surface roughness 5 . [0037] The inner surface of the working chamber is made of leucosapphire. [0038] The surface of the working chamber is machined to the surface roughness of 5 . [0039] The second part is made of metal. [0040] The proposed unit is made as follows:

[0041] Primarily the leucosapphire glass is made as the first part, a basic kit for the manufacture and assembly of the sapphire plungers and (or) pistons in pumping and metering devices.

[0042] The blanks with margins of 0.3 mm to 2.6 mm for finishing and superfinishing precision mechanical and chemical machining are made of artificial leucosapphire single crystal by Stepanov method in orientation along the C 0001 axis. After passing the leucosapphire single crystal growth stage, the grown single crystal is discharged from the unit and cooled to room temperature of 18-22 C. After the grown leucosapphire blanks are cooled, they are washed with tap water at room temperature, put in the drying box and dried at a temperature of 350-450 C.

[0043] Next comes the technical operation of cutting sapphire blanks to the required linear dimensions, with tolerances of 0.3-2.5 mm for further machining. Sapphire blank cutting is made by diamond rings on a special cutting machine.

[0044] The basic assembly units of sapphire pump and metering units exist in many variants and can be, for example the following:

[0045] A) Plunger with sapphire glass

[0046] B) Piston with sapphire glass

[0047] C) Slide with sapphire glass.

[0048] In some brands, models and modifications other than the plunger and (or) of the piston, so-called slide, a kind of crane may be present, the function of which is to open and allow the particular liquid dose, and by rotating, by a certain degree around its axis, the slide closes the inlet channel and at the same time opens the release channel to allow some liquid dose flow out. The slide works using rotational movements.

[0049] Next, the blanks are machined on precision machinery using mechanical and chemical-mechanical means. Each individual blank is machined according to the technology and design-technical documentation set in the terms of the performance specification (PS) documentation and in accordance with all the requirements of the European, international or Russian GOST, OCT, TU and passports for metering and pumping devices.

[0050] Production of sapphire cup in the application assembly technology sapphire piston and plunger slide occurs by mechanical and chemical-mechanical process on the precision CNC centerless cylindrical grinding machine tools or high-precision CNC machine tools Circular pivot. Such machine tools are the so-called superfinishing precision CNC machines. The processing of workpieces is made by sapphire with diamond tools, diamond wheels with different size of diamond grains (fractions). The process of diamond grinding of the working friction surfaces of the outer diameter sapphire blanks begins at the first stage of machining a rough grinding, diamond wheels with a large fraction of the diamond grains. Further diamond circles are replaced with smaller fractions of diamond grains, there is a so-called secondary grinding. Then there is the fine grinding processing of diamond grains, the so-called fine grinding. At the final stage of grinding diamond, grinding wheels with the smallest fraction of the diamond grains are used. This is called the fine and super fine mechanical grinding. Mechanical polishing of working surfaces rubbing sapphire glasses for use as components, the assembly of sapphire plungers, pistons and dampers completed when the surface roughness of the working part is not more than 100 nm.

[0051] In the future, the process of machining passes in chemical and mechanical At this stage, various special chemical liquid and form a suspension for superfinishing machining, polishing friction (working) surface of sapphire cups for the plungers and pistons are applied. The treatment process takes, place under the control of electronics in the high-precision machine tools. Polishing process ends with the receipt of polishing the surface roughness of the work of the sapphire, glasses at 5 .

[0052] The inner surface of the sapphire glass does Trot need to be polished, The process of internal grinding diameter sapphire glass takes place on the high-precision centerless inner polishing CNC machines to achieve the level of roughness of the broken surface of not re than 400 nm.

[0053] With mechanical and chemical-mechanical treatment in the manufacture of sapphire, glasses are kept on all access processing geometry specified in the design documentation. As an example, the following tolerances apply for roundness 0.005 mm, and linearity from 0.003 to 0.005 mm.

[0054] When preparing a sapphire c to the final stage of assembly in a single sapphire plunger, piston or vane is necessary to make preliminary calculations for the required gap between the inner diameter sapphire cup and an outer diameter stainless steel gate, which will be pressed Sapphire glass, The calculation of the gap as follows: Stainless steel AlSl 316L or 316, an outer diameter of 20 mm rod when heated to 4000 C expands: diameter of 20 mm, heated to 4000 C17106 mm=0.136 mm. Leucosapphire expanded diameter of 20 mm, heated to 4000 C7106 mm=0.056 mm. Thus, when heated to 400 C. with diameters and stainless steel AlSl 316L or 316 will be: 0.136 mm0.056 mm. For reliable press-fit tolerance the sufficient clearance is of 0.02 mm.

[0055] The assembly unit of sapphire of pumping and metering devices is mounted in a single structure of the pump or metering device in the following way: using hot or cold pressing of separate assembly units Sapphire glass and a metal gate into a single structure of the sapphire plunger, piston or vane. Further sapphire plunger or piston damper is inserted into the housing of the pump or dosing device.

[0056] Next there is a complete finishing assembly of the individual assembly unitsassembly sapphire pumping or dispensing device, after checking the quality of DTC products.

[0057] The apparatus according to FIG. 2 and 3 operates as follows.

[0058] Elements of the hydraulic device a plunger or piston (3) gate is assembled from two parts: the first part is made of sapphire having a surface roughness of 5 , and the secondfrom metal, which is pressed into the stem (in the case of a plunger or piston) or the plug (if gate) is placed inside the body (1) forming a working chamber (9), the inner surface of which is made, of sapphire having a surface roughness of 5 . Deferent (4) and inlet (5) are pressed into the channel body (1), wherein the diameters of the gate (6) or the plunger piston (3) to ensure sealing the inner diameter of the housing (1). The assembled device secured to a hydraulic line by means of dosing latch (not shown), fork (2) and the rod (7) is connected to the actuator for dispensing machine. For dosing a liquid medium supplied through a feed passage (5) for filling the chamber (8) of the housing (1) of the device. After filling chamber (8), gate (6) is rotated with the fork (2), wherein the supply (5) duct is closed and the outlet (4) channel opens, due to the fact that the damper (6) has a groove allowing open or close the outlet (4) or a lead (5) when rotating channels. The plunger or piston (3) with the stem (7) pushes the liquid medium through the outlet (4) channel, which fills corresponding container weighed.

[0059] The surface roughness of 5 of the leucosapphire cup plunger or piston damper including leucosapphire surface of the working chamber the enclosure avoids dispensing liquid chemical interaction with the internal elements of a pump dispenser, which provides a liquid dispensing chemical purity. In addition, the surface roughness of 5 , the device of the above elements provides a low coefficient of friction, ensuring high precision dosing and device lifetime.

[0060] When replacing a dosing fluid to another requires sterilization. The surface roughness provides a minimum friction coefficient and makes it easy to disassemble the individual elements (vane, piston, the piston) of the hydraulic device.

[0061] Thus, the invention provides a hydraulic device which allows excluding interaction with elements of fluid dispensing device and improve the accuracy of dosing device lifetime, reduce the assembly time/disassembly of the pump when it is sterilized.

[0062] The invention has been disclosed above with reference to a specific embodiment thereof. For specialists may be evident, and other embodiments of the invention that do not alter its essence, as it is disclosed herein. Accordingly, the, invention should be considered limited in scope only by the following claims.