Energy generator using telescopic linear hydraulic actuators with injection shaft fixed directly into the base of a piston, with a pneumatic bellows pump, containing static liquid, with a linear magnetic actuator

The power generator employs parallel hydraulic linear actuators with accordion suction pumps and magnetic actuators to minimize hydraulic fluid use and leakage, enhancing engine performance and durability.

WO2025171453A1PCT designated stage Publication Date: 2025-08-21PEREIRA DARCI DE SOUZA
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Patent Information

Application Number
PCT/BR2025/050014
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-02-14
Filing Date
2025-01-16
Publication Date
2025-08-21

AI Technical Summary

Technical Problem

Linear actuators consume a significant volume of hydraulic fluid and are prone to leaks, posing environmental risks, despite existing technologies attempting to mitigate these issues.

Method used

A power generator using parallel hydraulic linear actuators with accordion suction pumps, magnetic actuators, and auxiliary static fluid tanks, operating on Pascal's principle, reduces the required hydraulic fluid volume by inflating accordion pumps with air, thus multiplying force proportionally to the area.

Benefits of technology

The system achieves greater hydraulic potential for engines with reduced fluid consumption, lower leakage risk, and enhanced durability by minimizing fluid volume and friction, offering a cost-effective solution.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present patent application comprises an energy generator (E) composed of two self-feeding hydraulic systems, built on a structure and divided into a hydraulic system (S1) and a hydraulic system (S2), which have the same main features, comprising a magnetic actuator (2), a magnetic actuator (29), a force multiplier (40A) and a force multiplier (50).
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Description

[0001] POWER GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECTLY AT THE BASE OF THE PISTON, WITH AIR-ACCOMPANIED PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER

[0002] INTRODUCTION

[0003]

[0001] This invention application relates to a novel high-performance power generator that uses a system of parallel hydraulic linear actuators that synchronously act on Pascal's principle, through a fixed injector tube towards the lower surface of the pistons, containing static fluid, which have accordion suction pumps in order to reduce the internal useful area, also having magnetic actuators, in addition to auxiliary tanks of static fluid. In this way, the system of parallel hydraulic linear actuators multiplies the force in a ratio directly proportional to the area, making hydraulic potential available to a motor.

[0004] FIELD OF APPLICATION

[0005]

[0002] The present invention has the field of application focused on hydraulic circuits, more specifically, in the conversion of hydraulic energy into linear mechanical energy, preferably in conjunction with structures for aligning the linear actuator with the transmission arm.

[0006] PROBLEM TO BE SOLVED

[0007]

[0003] Environmental care is a topic of utmost importance in all segments of society. Products and manufacturing processes considered environmentally sustainable are currently a market differentiator.

[0008]

[0004] It is known by those skilled in the art that linear actuators are devices, due to their own construction characteristics, that consume a considerable volume of hydraulic fluid, whether they are single-acting actuators, with a higher incidence of leaks, or double-acting actuators, which, even with loss mitigation resources, still pose risks to nature.

[0005] In this context, new technologies that can reduce the volume of hydraulic fluid used in hydraulic actuators and increase their effectiveness are welcome in the segment in question.

[0009] STATE OF THE TECHNIQUE

[0010]

[0006] The current state of the art anticipates patent documents that deal with linear actuators such as BR 102013014504-1 A2 entitled “CONSTRUCTION DISPOSITION IN SINGLE-ACTION HYDRAULIC CYLINDER” - it comprises two parts, basically, that is, a cylinder cover or liner and a movable piston connected to a hollow rod. The hollow rod that makes up the hydraulic cylinder is formed by a hollow tubular body, inside which a "piston accumulator" is defined; and inside this hollow rod is provided a gas and outside and around this same hollow rod, that is, inside the cylinder liner, is provided a liquid, such as fluid.

[0011]

[0007] The above document anticipates a cylinder with a hollow rod with two chambers, one containing gas and the other fluid, which, depending on the pressure exerted, forms a compensation between these elements in order to reduce the efforts, thus enabling a smaller dimensioning of the components.

[0012]

[0008] Document BR 112014000157-0 A2 entitled 'CYLINDER DEVICES WITH FORCE MULTIPLIER' - especially of a first piston inserted in a housing so as to be able to move up and down while remaining sealed. A second piston is inserted in the cylinder bore of the first piston so as to be able to move up and down while remaining sealed, and an output rod projects from the second piston towards the upper part of the housing. A locking chamber and a release chamber are formed respectively below and above the first piston and the second piston.

[0009] A force multiplication mechanism is arranged inside the housing so that the force with which the pressure fluid supplied to the locking chamber presses the first piston upwards is converted and multiplied and is transmitted to the second piston.

[0010] In the document above, force multiplication occurs through the concentricity and overlapping of two pistons that have their force multiplied by an artifact located in a mechanism in the piston chamber with a smaller diameter.

[0013]

[0011] Document BR 102022025836-8, filed on 12 / 16 / 2022 by the inventor himself, entitled “TELESCOPIC LINEAR HYDRAULIC ACTUATOR WITH FIXED INJECTION ROD, DIRECTLY AT THE BASE OF THE PISTON CONTAINING STATIC LIQUID, deals with a cylindrical piston with a lower cover and threaded extension, filled with static liquid, connected to a watertight extension tube in relation to a fixed injector tube of small diameter and watertight thanks to a perimeter sealing housing, which, by Pascal's principle, when injecting hydraulic fluid into the lower surface of said cylindrical piston, equipped with a communicating orifice, is capable of displacing it with the force multiplied in a ratio directly proportional to the area of ​​​​such surface.

[0014]

[0012] However, the present invention is a substantial advance in relation to the previous application, since, in the present application, it concerns parallel hydraulic linear actuators that act based on the association of hydraulic fluid, pistons with accordion suction pumps, magnetic actuators, limit switches, auxiliary static fluid tanks, thus multiplying the force in a ratio directly proportional to the system with parallel hydraulic actuators, thus providing greater hydraulic potential for an engine.

[0015] PROPOSED SOLUTION

[0016]

[0013] Given the above, the inventor in question, a scholar and researcher in the field, developed a high-performance power generator that uses a system of parallel hydraulic linear actuators, which synchronously act on Pascal's principle, which passes through a fixed injector tube towards the lower surface of the pistons. Each hydraulic piston is equipped with a bellows suction pump made of rubber or metal, fixed to the piston inside the cylinder, which rises when actuated by the smaller hydraulic piston fixed in the complementary hydraulic system.In this way, the hydraulic piston uses the minimum volume of liquid due to the space occupied by the accordion suction pump when inflating with air, occupying space that would be the liquid, thus, by Pascal's principle, by the action of the static fluid, magnetic actuators, limit switches, auxiliary static fluid tanks, which substantially multiplies the force in a ratio directly proportional to the area, thus providing greater hydraulic potential for an engine.

[0017] OBJECTIVES OF THE INVENTION

[0018]

[0014] The objective of the present invention is to propose a power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a linear magnetic actuator and the Pascal principle, capable of multiplying the force applied to the piston with a reduced volume of oil, since the internal volume of the cylinder is reduced by inflating the bellows pump with ambient air, in addition to which the fluid circulation occurs internally to the fixed injection rod and, therefore, with greater advance.

[0019]

[0015] The objective of the present invention is to propose a power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a linear magnetic actuator of simplified construction.

[0020]

[0016] The objective of the present invention is to propose an energy generator by means of telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a linear magnetic actuator with fewer points prone to leakage.

[0021]

[0017] The objective of the present invention is to propose a power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a linear magnetic actuator with reduced friction during displacement, therefore more durable in relation to the actuators existing on the market whose friction between the sleeve and the piston is high.

[0018] The objective of the present invention is to propose a power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a durable linear magnetic actuator, with evident energy gain and that operates without fluid waste.

[0022]

[0019] The objective of the present invention is to propose an energy generator by means of telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, containing static liquid with a linear magnetic actuator with an excellent cost-benefit ratio.

[0023] DESCRIPTION OF DRAWINGS

[0024]

[0020] To aid understanding, the following figures are attached:

[0025] Fig. 1: Schematic view of the power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, with the S1 system at rest;

[0026] Fig. 2: Enlarged schematic view of the positions of the accordion pneumatic pumps, with system S1 at rest;

[0027] Fig. 3: Schematic view of the power generator using telescopic linear hydraulic actuators with a fixed injection rod, directly at the base of the piston, with a bellows pneumatic pump, with the S2 system at rest;

[0028] Fig. 4: Enlarged schematic view of the positions of the accordion pneumatic pumps, with system S2 at rest;

[0029] Fig. 5: Schematic cross-section view of the magnetic actuator of the power generator by means of telescopic linear hydraulic actuators with fixed injection rod, direct at the base of the piston, with accordion pneumatic pump;

[0030] Fig. 6: Schematic side sectional view of the force multiplier of the power generator by means of telescopic linear hydraulic actuators with fixed injection rod, direct at the base of the piston, with bellows pneumatic pump; Fig. 7: Schematic side sectional view of the metallic bellows pump of the power generator by means of telescopic linear hydraulic actuators with fixed injection rod, direct at the base of the piston, with bellows pneumatic pump. DETAILED DESCRIPTION OF THE INVENTION

[0031]

[0021] The “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECT AT THE BASE OF THE PISTON, WITH ACCORDIONED PNEUMATIC PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” according to the present invention, consists of an energy generator (E) composed of two hydraulic systems, which self-feed, being built on a structure and divided into a hydraulic system (1) and a hydraulic system (2), which have the same preponderant characteristics, formed by a magnetic driver (2) and a magnetic driver (29), a force multiplier (40A) and a force multiplier (50).

[0032]

[0022] More particularly, the invention relates to a “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECT AT THE BASE OF THE PISTON, WITH AN ACCORDIONED PNEUMATIC PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” that uses Pascal's principle to multiply the force and cylinders with accordion pumps for suction of ambient air to reduce the internal volume, in addition to magnetic drivers, thus requiring a smaller amount of hydraulic fluid in the system, as illustrated in Fig. 1, in this form of implementation of the invention formed by at least two hydraulic systems in which the force applied from the hydraulic system (S1) to the hydraulic system (S2), through de-energized electrovalves, in which the upper rod (1) of the magnetic driver (2) is joined to a rod (3) of the upper cylinder (4), through the magnetic action of repulsion and attraction of the magnetic actuator (2), causing the mobile magnet (5) to descend,pulling the rod (3) of the upper cylinder (4), sucking the liquid through a tube (6) into the upper cylinder (4) coming from a tank (7). Thus, the flow of a normally open solenoid valve (8) is de-energized, allowing the passage of liquid, where the lower rod (9) of the magnetic actuator (2) presses a piston (11) at the upper base of the rod (10), which in turn descends, and the piston forces the accordion suction pump (12) causing the air inside it to be expelled to the external environment and the liquid from the piston (11) flows to the tank (14) passing through the normally open solenoid valve (15), which is de-energized, and a pipe (16) that joins a pipe (17), being blocked by a normally closed and de-energized solenoid valve (62), at the same time, the rods of the hydraulic cylinders (18) and (19) coupled under the aforementioned upper base of the rod (10) are pushed forcing the liquid inside the cylinders (18) and (19) to flow,due to the fact that the passage of the liquid to the tank (14) is closed due to having a normally closed electrovalve (20) and (21), which are de-energized, they pass without restriction through the normally open electrovalve (22), which is de-energized, allowing the fluid to be directed to a piston (23) located in the hydraulic system (S2), when the liquid passes it presses the piston of the piston (23) which in turn advances with multiplied force, pulling at the same time the accordion suction pump (25) being inflated with air coming from the external environment through the breather inlet (R) and the rods of the hydraulic cylinders (26) and (27) are pulled, sucking the liquid coming from the tank (14), which has a normally open de-energized electrovalve (61). The purpose of the accordion pump (12, 25) is to suck air from the external environment, so that the space occupied by this pump containing air reduces the volume of liquid inside the cylinder (11 or 23) necessary to actuate the piston,thus a piston with a smaller piston area and, therefore, with a smaller volume of liquid. When comparing figures 1 and 3, due to the space occupied by the accordion suction pump (12, 25) that inflates (with air) as the rod rises, occupying space that would be the liquid, inside the cylinder, force is gained with the smallest possible volume of liquid, for the advance coming from the actuation of the smaller pistons to the larger piston. The advancement of the piston rod (23) pushes a lower rod (28) of the magnetic actuator (29) making the mobile magnet (30) reach the starting point in the repulsion field, while the upper rod (31) of said mobile magnet (30) forces the rod (32) of the upper cylinder (33) pressing the liquid that flows through a tube (34) equipped with a normally closed energized electrovalve (35), preventing the liquid from going to the tank (7), with the flow directed to the force multiplier (40A) that passes through an electrovalve,

[0033] (36) normally open de-energized, at the same time, in which the solenoid valve

[0034] (37) normally closed de-energized, prevents the passage of liquid to the tank (7), with this the liquid passes through a fixed injector tube (38) towards the extender (39), making the piston (40) advance, compressing the return spring (41) located at the base of the extender (39) in the dry part of the cylinder (43), and pushing the liquid inside the cylinder (44), which passes through a normally open de-energized and closed electrovalve (45), by means of a normally closed de-energized electrovalve (46), preventing the passage of liquid to the reservoir (7) and with tube to the force multiplier (50) by means of a normally closed electrovalve (47).

[0035]

[0023] In this way, the pressured liquid from the force multiplier (40A) flows directed to move a hydraulic motor (49) with greater force and flow, which in turn rotates an electric generator (51). Simultaneously, the force multiplier (50) by the action of the spring (48) sucks the liquid from the tank (7) into the cylinder (52), where the tube (6), which connects to the multiplier tube (50) is blocked by the normally closed de-energized electrovalve (57), while a normally open electrovalve (53), which is de-energized, allows the discharge of the liquid that is in an extender (54) to flow into the tank (7), causing the piston (55) to descend.

[0036]

[0024] The hydraulic system (S2) the upper base of the rod (24) of the piston (23) reaches the maximum upper point activates a limit switch device (58) connected to the power of a battery, causing the electrovalves to be energized, so that they are electrically connected in series, causing the normally open electrovalves to close and the normally closed ones to open, consequently, reversing the direction of the liquid flow and the direction of application of the force to the hydraulic system (S2).

[0037]

[0025] Furthermore, Fig. 2 shows the force applied from the hydraulic system (S2) to the hydraulic system (S1), through energized electrovalves, where the upper rod (31) of the magnetic actuator (29) is joined to a rod (32) of an upper cylinder (33), through the magnetic action of repulsion and attraction of the magnetic actuator (29), where the mobile magnet (30) descends, pulling the rod (32) of the upper cylinder (33), sucking the liquid through a tube (34) into the cylindrical (33) coming from the tank (7), in this direction of flow the electrovalve (35), which is normally closed energized, allowing the passage.A lower rod (28) of the magnetic actuator (29) presses the piston (23) at the upper base of the rod (24) which in turn descends, and the piston forces the accordion suction pump (25) causing the air inside it to be expelled to the external environment and the liquid from the piston (23) to flow to the tank (14) passing through the normally closed solenoid valve (21), which is energized. The tube (59) that joins the tube (60) is blocked by a normally open energized solenoid valve (22). At the same time, the rods of the hydraulic cylinders (26) and (27) coupled under the mentioned piston (23) are pushed forcing the liquid inside to flow.

[0038]

[0026] The fluid passes without restriction through the normally closed solenoid valve (62), which is energized, allowing the fluid to be directed to the piston (11) located in the hydraulic system (S1). When the liquid passes, it presses the piston plunger (11), which in turn advances with multiplied force, simultaneously pulling the accordion suction pump (12), which is inflated with air from the external environment; the rods of the hydraulic cylinders (18) and (19) are pulled, sucking the liquid from the tank (14). This advancement of the piston (11) pushes the upper rod (1) of the magnetic actuator (2), causing the mobile magnet (5) to reach the starting point in the repulsion field.

[0027] While the rod (1) of said mobile magnet (5) forces the rod (3) of the upper cylinder (4), pressing the liquid that flows through the tube (6) equipped with a normally open and energized electrovalve (8), preventing the liquid from going to the tank.The flow is directed to the force multiplier (50), which passes through a normally closed solenoid valve (57), energized at the same time as the normally open energized solenoid valve (53) prevents the passage of liquid to the tank (7).

[0028] With this, the liquid pressed from the force multiplier (50) flows directed to move the hydraulic motor (49) with greater force and flow, which in turn rotates the electric generator (51). Simultaneously, the force multiplier (40A), by the action of the spring (41), sucks the liquid from the tank (7) to the interior of the piston (40), passing through the normally closed and energized solenoid valve (46), while a normally closed solenoid valve (37) that is energized, allows the discharge of the liquid that is in the extender (39) to the tank (7).The piston (40) descends until reaching the lowest maximum point, while the piston (11) located in the hydraulic system (S1) reaches the highest maximum point, activating the limit switch device (63), turning off the circuit and restarting the cycle, as they work in synchrony in an alternating manner, while one piston descends the other rises, thus the piston (23) in the system (S2) receives the external force from the actuators (18) and (19) under the upper base of the rod (10) in the hydraulic system (1); while the piston (11) in the hydraulic system (S1) receives the external force from the actuators (26) and (27) under the upper base of the rod (24) in the hydraulic system (S2).

[0039]

[0029] Figure 7 shows a hydraulic piston (11, 23) equipped with a telescopic metal accordion suction pump (12, 25), more resistant than the one made of polymer, which makes it less susceptible to being punctured by particles contained in the fluids, when in working mode. The accordion suction pump (12, 25) has a lower closure (68) and an upper closure (69) interspersed by overlapping circular stages (70) with freedom of vertical movement between them, such as that of a telescope, having a lower vent (R) and an upper pin (71), concentric, both intended for attachment to the hydraulic piston.

Claims

CLAIMS 1) “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECT AT THE BASE OF THE PISTON, WITH ACCORDIONED PNEUMATIC PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” consists of a power generator composed of a hydraulic system (S1) and a hydraulic system (S2), characterized by multiplying the force and cylinders with accordion pumps (12, 25) for suction of ambient air to reduce the internal volume, in addition to magnetic drivers (2, 29), requiring a smaller amount of hydraulic fluid in the system; through de-energized electrovalves the upper rod (1) of the magnetic driver (2) is joined to a rod (3) of the upper cylinder (4), where the magnetic driver (2) has a mobile magnet (5); the upper rod (1) of the magnetic actuator (2) is joined to a rod (3) of the upper cylinder (4), through the magnetic action of repulsion and attraction of the magnetic actuator (2), causing the mobile magnet (5) to descend,pulling the rod (3) of the upper cylinder (4), sucking the liquid through a tube (6) into the upper cylinder (4) coming from a tank (7); the flow of a normally open solenoid valve (8) is de-energized, allowing the liquid to pass through, where the lower rod (9) of the magnetic actuator (2) presses a piston (11) at the upper base of the rod (10), which in turn descends, and the plunger forces the accordion suction pump (12) causing the air inside it to be expelled to the external environment and the liquid from the piston (11) flows to the tank (14) passing through the normally open solenoid valve (15), which is de-energized, and a pipe (16) that joins a pipe (17), being blocked by a normally closed and de-energized solenoid valve (62), at the same time, the rods of the hydraulic cylinders (18) and (19) coupled under the aforementioned upper base of the rod (10) are pushed, forcing the liquid inside the cylinders (18) and (19) to flow,due to the fact that the passage of liquid to the tank (14) is closed due to having normally closed electrovalve (20) and (21), which are de-energized, they pass without restriction through the normally open electrovalve (22), which is, de-energized, allowing the fluid to be directed to a piston (23) located in the hydraulic system (S2), when the liquid passes it presses the piston plunger (23) which in turn advances with multiplied force, pulling at the same time the accordion suction pump (25) being inflated with air coming from the external environment through the breather inlet (R) and the rods of the hydraulic cylinders (26) and (27) are pulled, sucking the liquid coming from the tank (14), which has a normally open de-energized electrovalve (61); the advancement of the piston rod (23) pushes a lower rod (28) of the magnetic actuator (29) making the mobile magnet (30) reach the starting point in the repulsion field, while the upper rod (31) of said mobile magnet (30) forces the rod (32) of the upper cylinder (33) pressing the liquid that flows through a tube (34) equipped with a normally closed energized electrovalve (35), preventing the liquid from going to the tank (7),having the flow directed to the force multiplier (40A) that passes through a normally open de-energized solenoid valve (36), at the same time, in which the normally closed de-energized solenoid valve (37), prevents the passage of the liquid to the tank (7), with this the liquid passes through a fixed injector tube (38) towards the extender (39), making the piston (40) advance, compressing the return spring (41) located at the base of the extender (39) in the dry part of the cylinder (43), and pushing the liquid inside the cylinder (44), which passes through a normally open de-energized and closed solenoid valve (45), by means of a normally closed de-energized solenoid valve (46), preventing the passage of the liquid to the reservoir (7) and with the tube to the force multiplier (50) by means of a normally closed solenoid valve (47). 2) “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECTLY AT THE BASE OF THE PISTON, WITH ACCORDION PNEUMATIC PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” according to claim 1, is characterized by the force multiplier (50) by the action of the spring (48) sucking the liquid from the tank (7) to the inside of the cylinder (52), where the tube (6), which connects to the multiplier tube (50) is blocked by the solenoid valve (57) normally closed de-energized, while a normally open solenoid valve (53), which is de-energized, allows the discharge of the liquid that is in an extender (54) to flow into the tank (7), causing the piston (55) to descend. 3) “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECTLY AT THE BASE OF THE PISTON, WITH AIR-COVERED PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” according to claim 1, is characterized by the limit switches (58, 66) inverting the direction of the system. 4) “ENERGY GENERATOR BY MEANS OF TELESCOPIC LINEAR HYDRAULIC ACTUATORS WITH FIXED INJECTION ROD, DIRECTLY AT THE BASE OF THE PISTON, WITH AIR-COVERED PUMP, CONTAINING STATIC LIQUID WITH LINEAR MAGNETIC DRIVER” according to claim 1, is characterized by using a telescopic metal air-covered suction pump (12, 25), more resistant than the one made of polymer, which makes it less susceptible to being punctured by particles contained in the fluids, when in working mode; the accordion suction pump (12, 25) has a lower closure (68) and an upper closure (69) interspersed by overlapping circular stages (70) with freedom of vertical movement between them, such as a telescope, having a lower vent (R) and an upper pin (71), concentric, both intended for attachment to the hydraulic piston.

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