Pulsation Dampener

Abstract

A pulsation dampener comprising a tubular element configured to enable the passage of a flow of fluid associated to the hydraulic circuit, the tubular element being provided with a first fluid medium which acts as a damping medium, wherein the tubular element includes coupling means for joining to the hydraulic circuit. Said pulsation dampener includes a hydro-pneumatic accumulator which has a primary chamber defined by an expandable separator means, said primary chamber being envisaged for housing a gas which acts as a second damping medium, such that the first fluid medium is contained in a first intermediate chamber located in the tubular element and in a second intermediate chamber located in the hydro-pneumatic accumulator, the first and second chambers being in fluid communication, the tubular element including a flexible rubber tube on the inside configured to increase or reduce the volume of the second intermediate chamber.

Claims

1. A pulsation dampener, envisaged to make up part of a hydraulic circuit, comprising a tubular element configured to enable the passage of a flow of fluid associated to the hydraulic circuit, the tubular element being provided with a first fluid medium which acts as a damping medium, wherein the tubular element includes coupling means for joining to the hydraulic circuit, the pulsation dampener comprising a hydro-pneumatic accumulator which has a primary chamber defined by an expandable separator, said primary chamber being envisaged for housing a gas which acts as a second damping medium, such that the first fluid medium is contained in a first intermediate chamber located in the tubular element and in a second intermediate chamber located in the hydro-pneumatic accumulator, the first and second chambers being in fluid communication through a passage conduit, wherein the tubular element includes on the inside a flexible first rubber tube configured to increase or reduce the volume of the second intermediate chamber.

2. The pulsation dampener according to claim 1, further comprising an additional rubber tube concentric to the first rubber tube, such that an intermediate chamber is defined between the two rubber tubes which is able to modify an inner volume.

3. The pulsation dampener according to claim 1, further comprising evacuation means communicating with the chamber between rubber tubes and outside of the tubular element.

4. The pulsation dampener according to claim 3, wherein the evacuation means comprises at least one through hole which is in communication with the outside of the tubular element.

5. The pulsation dampener according to claim 4, wherein the through hole is located in a ring which is linked to the two rubber tubes.

6. The pulsation dampener according to claim 3, wherein the evacuation means is linked to a pressure switch linked to a control unit.

7. The pulsation dampener according to claim 1, wherein the rubber tubes have two ends each having a ring-shaped protuberance which juts out radially towards an outside of the tubular element.

8. The pulsation dampener according to claim 2, wherein the additional rubber tube has two ends each having a ring-shaped protuberance which projects radially towards an outside of the tubular element.

9. The pulsation dampener according to claim 1, wherein the tubular element has at least one end and the coupling means comprises a threaded portion located on the at least one of the end of the tubular element.

10. The pulsation dampener according to claim 1, wherein the tubular element and the hydro-pneumatic accumulator are joined by means of an adapter element.

11. The pulsation dampener according to claim 1, wherein the expandable separator is a cup-shaped elastic bladder.

12. The pulsation dampener according to claim 1, wherein the expandable separator is an elastic bellow.

13. The pulsation dampener according to claim 1, wherein the expandable separator is an elastic membrane.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1.Is a partial cross section of an elevation view of the pulsation dampener according to the invention in a resting condition;

[0025] FIG. 2.Is a partial cross section of an elevation view of the pulsation dampener of the invention in a first operating condition; and

[0026] FIG. 3.Is a partial cross section of an elevation view of the pulsation dampener of the invention in a second operating condition.

DESCRIPTION OF A PREFERRED EMBODIMENT

[0027] In light of the aforementioned figures, and in accordance with the adopted numbering, one may observe therein an example of a preferred embodiment of the invention, which comprises the parts and elements indicated and described in detail below.

[0028] As seen in the figures, the pulsation dampener, envisaged for being assembled in-line in a hydraulic circuit, comprises a tubular element (8) made from metal material containing a liquid housed in a first intermediate chamber (17). This first intermediate chamber (17) is formed by the inner volume of the metal tubular element (8) and the outer diameter of a rubber tube (9). This first intermediate chamber (17) contains a liquid which is compatible with the liquid coming from the pump generating the pulsation and which enters through the end (20) of the tubular element (8) and comes out of the other end (21).

[0029] The liquid contained by the first intermediate chamber (17) also fills a passage conduit (19) and a chamber (18) inside the body of a hydro-pneumatic accumulator (5). The hydro-pneumatic accumulator, which is joined to the tubular element (8) by means of an adapter element (7), contains in the inside thereof a separator element (1) between the liquid of the chamber (18) and the gas, usually Nitrogen (N.sub.2) or another similar gas inside the primary chamber (22).

[0030] The hydro-pneumatic accumulator (5) incorporates an adapter (4) in the upper portion thereof which in turn incorporates a filling valve (3) to fill the inside of the bladder and a manometer (6) with gas.

[0031] In the embodiment shown in the figures, this separator element (1) between both fluids has been shown with a cup-shaped rubber bladder, which can also be a membrane, elastic bellow (not shown). The tubular element (8) houses in the inside thereof two rubber tubes (9, 10) which are elastic and concentric to each other. A hole (29) is also provided envisaged to perform the filling and emptying of the liquid fluid contained inside the intermediate chambers (17, 18). Once the intermediate chambers (17, 18) are filled, the hole (29) is closed by means of the cap (32).

[0032] FIG. 1 shows the cross section of the dampener of the invention arranged for the operation thereof. Inside the tubular element (8), the rubber tubes (9, 10) are seen.

[0033] FIG. 2 shows that these same rubber tubes (9, 10) are partially flattened, that is, with a slight curvature with respect to a longitudinal axis of the tubular element (8).

[0034] FIG. 3 shows that the two rubber tubes (9, 10) are stretched diametrically by the effect of the excess in volume generated by the pump, supplying the maximum flow. The pulsation dampener operates between the two positions of the rubber tubes (9, 10) which are concentric and coaxial with the tubular element (8) of the dampener according to FIGS. 2 and 3.

[0035] The volume of intermediate liquid enclosed in the intermediate chambers (17, 18) and passage conduit (19) is a constant volume previously introduced through the aforementioned hole (29). In FIG. 2, all this liquid is in the first intermediate chamber (17) and passage conduit (19), while in FIG. 3, a large part of this liquid is housed in the chamber (18) present inside the hydro-pneumatic accumulator (5).

[0036] The liquid driven by the pump circulates through the inside of the rubber tube (10), indistinctly entering through the end (20) and coming out through the other end (21). All the flow supplied by the pump of the hydraulic circuit circulates through the inside of the rubber tube (10). This rubber tube (10) is housed inside the other rubber tube (9). Both rubber tubes (9, 10) have on the ends thereof protuberances (15, 16) the purpose of which is to create the seal and prevent the outlet or leakage to the outside of the liquid pumped by the pump and of the liquid enclosed in the intermediate chambers (17, 18).

[0037] This is achieved by the tightening force exerted by screws (14) on flanges (13) and these in turn on rings (11, 12) through protrusions (28) which make up part of the threaded portions (30) envisaged to couple the tubular element (8) to a hydraulic circuit, and which compress the protuberances (15, 16) of the ends of the two rubber tubes (9, 10), on internal supports (26) located on each end of the tubular element (8) of the dampener.

[0038] It should be mentioned that the threaded portions can be substituted by means of flanges or another type of suitable join, wherein a sealing gasket (31) is incorporated.

[0039] Between the rubber tubes (9, 10) there is an intermediate chamber (23), which enables, in the case of the rubber tube (10) breaking due to friction or wear caused by the liquid supplied by the pump of the hydraulic circuit (not shown), an amount of the pumped liquid to be introduced which passes to the hole (25) through the through hole (24) located in a ring (12). This hole (25) is in the tubular element (8). The ring (12) incorporates two sealing gaskets (27).

[0040] It is worth mentioning that there is the possibility that a pressure switch or an equivalent apparatus is connected in the hole (25), which will detect the leakage of the pumped liquid by the breakage of the rubber tube (10). This signal, detected by the pressure switch when the pressure of the circulating liquid proceeding from the pump is received, enables a warning about the breakage of the flexible rubber tube (10) to be given. As there exists the second rubber tube (9), the liquid of the hydraulic circuit is not mixed with the liquid enclosed in the intermediate chambers (17, 18) and consequently there is no possibility of the pumped liquid being contaminated by the contact with the liquid enclosed in the intermediate chambers (17, 18).

[0041] These variations in pressure and volume are absorbed by compressing and dilating the gas inside the primary chamber (22) of the rubber bladder (1), (it incorporates a metal anti-extrusion button (2)) and this brings with it the elimination of the pressure peaks which are generated in the hydraulic circuit caused by the variations in instantaneous speeds of the gasket or membranes of the dosing or volumetric pumps.

[0042] The details, shapes, dimensions and other accessory elements, used to manufacture the pulsation dampener of the invention, may be suitably substituted for others which do not depart from the scope defined by the claims which are included below.