MXPA06008123A - Material pump - Google Patents

Abstract

A composite pump comprises multiple fluid pumps, each including a movable component and a crank coupled to the movable component. At least two of the movable components define between them a non-zero included angle.

Description

MATERIAL PUMP CROSS REFERENCE TO RELATED REQUESTS This application claims the benefit of the filing date of the United States of America patent 60 / 537,774 filed on January 20, 2004, assigned to the same assignee of this application. The disclosure of the United States of America patent 60 / 537,774 is incorporated herein by reference.

FIELD OF THE INVENTION This invention relates to material pumps. It is described in the context of a pump for pumping, for example, coating material (hereinafter referred to as paint), although it is considered to be useful also in other applications.

BACKGROUND OF THE INVENTION Various types of material pumps are known. There are, for example, the pumps illustrated and described in the patents of the United States of North America: 4,009,971; 4,397,610; 5,094,596; 5,220,259; 5,228,842; 5,336,063; 5,632,816; 5,725,150; 5,725,358; 5,746,831; 5,787,928; 5,944,045; and, 6,533,488, and references cited therein. There are also systems such as, for example, the Ransburg EZ Flow system, and Binks A41-78-R3 EXEL ™ Binks® Series Pump, ITW Industrial Finishing, 2002. There are also the descriptions of USSN 10 / 232,454, filed on August 30, 2002, entitled Multiple Component Metering And Dispensing System, and USSN 10 / 254,121, filed on September 25, 2002, entitled Two-Component Spray Gun With Solvent Flush / Blend, both assigned to the same assignee as this application. There is also the description of Electric-Powered Triumph ™ 9000 Reciprocator For Use With Graco Pumps (1994). The descriptions of these references are incorporated herein by reference. This list is not intended to be a representation that a full search has been made of all the relevant technique, or that there is no more relevant technique than that listed, or that the listed technique is material for patentability. Nor shall any representation of that type be inferred.

DESCRIPTION OF THE INVENTION According to a first aspect of the invention, an assembly of multiple fluid pumps is provided. Each pump includes a mobile component. A crank is coupled to the mobile component. At least two of the moving components define an included angle different from zero between them.

Illustratively according to this aspect of the invention, the crank comprises at least two discharges, the apparatus also including at least two connecting rods, the crank that is coupled to the moving components by at least two discharges and at least two connection bars. Illustratively according to this aspect of the invention, said at least two discharges comprise at least three discharges, one of said at least three discharges defining included substantially equal angles with the other two of said at least three discharges. downloads. Illustratively according to this aspect of the invention, said at least three discharges comprise n discharges, n which is an integer greater than 2, each discharge forming angles included with the other two of the n discharges, each included angle that is approximately 360 ° / n. According to another aspect of the invention, assembly of multiple fluid pumps is provided. Each pump includes a mobile component. A cam is coupled to the mobile component. At least two of the moving components define an included angle different from zero among them. The assembly also includes at least two followers. The cam is coupled to the mobile component through at least two followers. Illustratively according to this aspect of the invention, the cam is configured to drive said at least two of the pumps so that one of said at least two pumps reaches the start of an exhaust stroke substantially at the same time as the other of said at least two pumps reaches that of a priming stroke. Illustratively according to this aspect of the invention, the apparatus comprises m leves, m is an integer greater than or equal to 2, each cam including p projections, p is an integer greater than or equal to 2, a line drawn between peaks two adjacent projections of one of the cells forming angles other than zero with lines drawn between peaks of any two adjacent projections of another of the cells. Illustratively according to the invention, the pumps are pumps of coating material.

BRIEF DESCRIPTION OF THE DRAWINGS The invention can be better understood by reference to the following detailed description and the accompanying drawings which illustrate the invention. In the drawings: Figure 1 illustrates an elevation view partly in fragmentary section of a composite pump constructed in accordance with the invention; Figure 2 illustrates a fragmentary sectional view of the embodiment illustrated in Figure 1, taken generally along the section lines 2-2 thereof; and, Figure 3 illustrates a partially exploded top plan view of a composite pump constructed in accordance with the invention.

DETAILED DESCRIPTIONS OF ILLUSTRATIVE MODALITIES The fluid outlet pressure from certain positive displacement pumps, such as alternating piston fluid pumps, commonly exhibits pressure pulses. An example of such pumps is a four-sphere pump of the type illustrated, for example, in Binks® A41-78-R3 EXEL ™ Pump Series Binks®, ITW Industrial Finishing, 2002. In said pump, as the pistons reverse the directions, there is a negative impulse in the output fluid pressure. Although other types of pumps, such as rotary pumps and the like provide a more stable flow with less or less drastic changes in the output fluid pressure, most of those pumps expose the fluids they pump at considerable shear. In most applications, for example, the pumping of certain coating materials that are circulated continuously in a circuit of coating material, the exposure of the recirculating coating material to high shear stress can adversely affect the useful life of recirculation of the coating material. Hacienda now references Figures 1-2, a composite pump 120 includes multiple fluid pump sections 120-1, 120-2, ... 120-n, only one of which is illustrated. Commonly, the components of the composite pump are held in a structure 121. Each pump section 120-1, 120-2, ... 120-n includes an operating rod 122-1, 122-2, ... 122 -n, respectively. The pump 120 further includes a crank shaft 124 rotatably mounted in suitable bearings. Hand crank shaft 124 has discharges 124-1, 124-2 ,. , .124-n. The operating rods 122-1, 122-2, ... 122-n of pump sections 120-1, 120-2, ... 120-n, respectively, are coupled by connecting rods 126-1, 126- 2, ... 126-n, respectively, at discharges 124-1, 124-2 .... 124-n, respectively. When viewed from one end 128 of the crank shaft 124, the discharges 124-1, 124-2, ... 124-n illustratively form equal angles with adjacent discharges 124-1, 124-2, ... 124 -n. however, it will be understood that, the discharge 124-1 need not be offset by equal angles between the discharge 124-2 and 124-n. in fact, discharge 124-m and discharge 124- (m-1) or 124- (m + 1), 1 < m < n, they could form 180 ° angles with respect to each other. It simply represents that the 124-m discharge is located at equal angles between two of the remaining discharges 124-1, 124-2, ... 124- (m -1), 124- (m + 1), ... 124-n. It will be further understood that it is not necessary for the discharges to be offset in equal angles to one another. For example, the invention can be practiced using a crank shaft having only two discharges that are angularly offset one from the other by, for example, 90 °. The pistons of the pump sections 120-1, 120-2, ... 120-n are driven out of phase in order to provide a fluid supply having reduced pump pressure pulses. Any angular orientation in which one of the pump sections 124-1, 124-2, ... 124-n is not at the end of a pumping stroke when another of the pump sections 124-1, 124-2, ... 124-n reaches the end of his pumping career and starts his career of priming or admission will reduce the impulse in a negative direction, thus uniforming the flow of the pumped. The crank shaft 124 is driven illustratively by an AC motor 136 through a right angle gearbox 138. In another embodiment of the invention illustrated in FIG. 3, a composite pump 220 constructed in accordance with the invention includes multiple fluid pump sections 220-1, 220-2, ... 220-n held in a structure 221. Each pump section 220-1, 220-2, ... 220-n includes an operating bar 222 -1, 222-2, ... 222-n, respectively. The pump 220 also includes a crank shaft 224 that rotates one or more suitably shaped cams, for example, somehow elliptical or cardioid, 226-a, 226-b, ... 226-m. a follower 228-1, 228-2, ... 228-n is coupled to each respective operation bar 222-1, 222-2, ... 222-n. The respective followers 228-1, 228-2, ... 228-n are coupled to each other in opposite pairs, 228-1, 228-2; 228-3, 228-4; ... 228- (n-1), 228-n by helical tension springs 230, so that respective cam surfaces 232 of respective cams 226-a, 226-b are continuously driven. , ... 226-m. In this way, as one of the respective opposite sections 228-1; 228-3; ... 228- (n - 1), reaches the end of its pumping stroke, the other of the respective opposing sections 228-2; 228-4; ... 228-n arrives at the beginning of its pumping stroke, thus uniforming the flow of the pumped fluid. When there are multiple cams 226-a, 226-b, ... 226-m, the cams 226-a, 226-b, ... 226-m can also be oriented with their projections at different angles to each other. For example, if the cams 226-a, 226-b, ... 226-m are somehow elliptical, having projections on the two opposite ends of their main axes, the main axes of the cams 226-a, 226 -b, ... 226-m may be oriented at different angles to each other so that the pumping and priming strokes of each opposite pair 220-1, 220-2; 220-3, 220-4; ... 220- (n - 1), 220-n pump sections are out of phase with those of the other opposite pairs 220-1, 220-2; 220-3, 220-4; ... 220- (n - 1), 220-n pump sections. This arrangement also unifies the flow of the pumped fluid.

Claims (14)

1. An assembly of multiple fluid pumps, each pump including a moving component, a crank coupled to the movable component, at least two of the movable components defining between them a non-zero included angle.

The assembly according to claim 1, characterized in that the pumps are pumps of coating material.

The apparatus according to claim 1, characterized in that the crank comprises at least two, the apparatus also including at least two connecting rods, the crank that is coupled to the moving components by at least two discharges and at least the two connection bars.

4. The assembly according to claim 3, characterized in that the pumps are pumps of coating material.

The apparatus according to claim 3, characterized in that at least the discharges comprise at least three discharges, one of at least the three discharges defining included substantially equal angles between the other two of at least three discharges.

The assembly according to claim 5, characterized in that the pumps are pumps of coating material.

7. The apparatus according to claim 5, characterized in that said at least three discharges comprise n discharges, n is an integer greater than 2, each discharge forming angles included with the other two of the n discharges, each included angle being of approximately 360 ° / n.

The assembly according to claim 7, characterized in that the pumps are pumps of coating material.

9. An assembly of multiple fluid pumps, each pump including a moving component, a cam coupled to the moving component, at least two of the moving components defining among them an included non-zero angle, at least two followers, the cam which is coupled to the mobile component by means of at least two followers.

The assembly according to claim 9, characterized in that the pumps are pumps of coating material.

The apparatus according to claim 9, characterized in that the cam is configured to drive at least two of the pumps so that one of at least two pumps reaches the start of an exhaust stroke substantially at the same time as the another one of said at least two pumps reaches the start of a priming run.

The assembly according to claim 11, characterized in that the pumps are pumps of coating material.

13. The apparatus according to claim 11, characterized in that it comprises m levies, m is an integer greater than or equal to 2, each cam including p projections, p is an integer greater than or equal to 2, a line drawn between peaks of two adjacent protrusions of one of the cells that form nonzero angles with lines drawn between peaks of any two of the adjacent protrusions of another of the cells. The assembly according to claim 13, characterized in that the pumps are pumps of coating material.