RU2568021C1 - Suction valve of axial plunger hydraulic pump - Google Patents

Suction valve of axial plunger hydraulic pump Download PDF

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Publication number
RU2568021C1
RU2568021C1 RU2014130157/06A RU2014130157A RU2568021C1 RU 2568021 C1 RU2568021 C1 RU 2568021C1 RU 2014130157/06 A RU2014130157/06 A RU 2014130157/06A RU 2014130157 A RU2014130157 A RU 2014130157A RU 2568021 C1 RU2568021 C1 RU 2568021C1
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Russia
Prior art keywords
plunger
valve
seat
pump
suction
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RU2014130157/06A
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Russian (ru)
Inventor
Павел Владимирович Щербачев
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Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России)
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Priority to RU2014130157/06A priority Critical patent/RU2568021C1/en
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Abstract

FIELD: engines and pumps.
SUBSTANCE: suction valve is made integral with the plunger and arranged at the plunger end. It consists of a shutoff element and seat composed of the plunger end surface. The spring thrusts the valve against the seat. Sea water is used as the working fluid. The valve shutoff element is made of sea water proof polymer, i.e. VICTREX PEEK polyarylketone ether. Valve seat is made of antirust titanium alloy. Antifriction pair VICTREX PEEK-nitrated titanium is used to make the bearings of plungers with suction valves, plunger cylinder units, and the pump antifriction bearings. The valve sliding over the seat guide makes the friction pair operating without lubing and corrosion in aggressive sea water. This hollow plunger has the suction valve seat composed of a hollow rod screwed therein.
EFFECT: better operation of pump plunger suction valve, higher antirust and antifriction properties, higher pump efficiency.
3 dwg

Description

Technical field
The invention relates to structural elements of axial-plunger pumps designed to operate in specific conditions and with specific working fluids, specifically: in sea water at different sea depths and using sea water as a working fluid.
State of the art
Known axial-plunger volumetric (volumetric principle of action) water pump, presented in published Chinese patent application CN 1218874 (A) (IPC F04B 1/12; F04B 1/16, published 09.06.1999, corresponding published Chinese patent CN 1093601 (C )) and designed for pumping high-pressure sea water and other low-viscosity liquids as working fluids. The pump has a valve with an elastomeric seal, a plunger, on both sides of which are reliably separated water and oil. The main friction pair is oil lubricated. According to the authors, the pump has a simple design, good suction capacity, high efficiency and reliability.
However, this pump is not completely filled with sea water and has an oil chamber (pos. 18 in Figs. 1, 2 of the analogue description), which is hermetically separated from the pumped water. Such a design can hardly be used for a pump operating at great depths with high pressure of the surrounding aqueous medium, since there will be inevitable overflow of water into the oil and vice versa. Moreover, the suction valves (pos. 21 of Fig. 1 of the description of the analogue) of the pump are not located in the plungers, but directly in the pump casing, which is a traditional technical solution.
The closest analogue in design of the proposed suction valve and the pump as a whole with such valves can be considered the execution of a similar suction valve in the design of the pump shown in FIG. 7 descriptions of US patent US 535418 1A Hydraulic piston pumps equipped with suction valve (IPC F04B 53/10; F04B 53/12; F04B 1/14; F04B 1/12; publ. 11.10.1994 ) An axial plunger pump, in which the plungers are informed of alternating reciprocating motion through the bearings (17) by means of a cam (6) on a shaft mounted in rolling bearings, the device acting as a suction valve, made in conjunction with each plunger (14), while the discharge pressure is constantly supplied to the inside of the support (17), whereby said support (17) interacts with said cam (6). The suction valve is located at the end of the plunger (14) and consists of the following elements: an annular locking element (41); a saddle, the role of which is played by the end surface of the plunger; a spring (40) pressing the valve to the seat. In the indicated constructive embodiment, the working fluid enters through the bore (39) in the plunger (14) and then through the holes (42) into the working chamber (9) of the cylinder with the plunger. The role of the suction valve is to open the holes (42) for the passage of fluid during the stroke of the plunger for suction and close them during the stroke of the plunger for discharge.
However, the specified pump is designed to work on viscous oil as a working fluid, and the specified bore (39) in the plunger reduces the length of the plunger, which is responsible for separating the working chamber from the suction area. The smaller the length of the mating surfaces along which the fluid is leaking, the greater the magnitude of the leak itself. This is especially important when the pump is running on water (including marine) with a low viscosity and low lubricity, unlike oil. Also in the specified pump in connection with the use of oil as a working fluid, there are no problems when using rolling bearings. And there are a number of places for possible improvement of the design and the use of other materials in it, taking into account the working conditions with sea water as a pump working fluid.
Disclosure of invention
The objective of the invention is a significant improvement in the adaptation of the design of the suction valve of each plunger of the axial plunger pump and the pump itself to the conditions of work with aggressive and low viscosity sea water as a working fluid.
EFFECT: improved corrosion resistance and antifriction properties of movable pump elements, including suction valves of plungers in contact with aggressive sea water.
The suction valve of the axial-plunger hydraulic pump is located at the end of the plunger and consists of the following elements: annular locking element; saddle at the end of the plunger; a spring pressing the annular locking element of the valve to the seat. The suction valve is configured to open the holes in the valve seat to allow fluid to enter the plunger during the plunger for suction and to close them during the plunger for injection. Moreover, taking into account sea water as the working fluid, the annular locking element of the specified valve is made of a polymer resistant to sea water - VICTREX PEEK polyaryletherketone (manufactured by Victrex plc), and the valve seat is made of an anticorrosive titanium alloy; from the antifriction bond of friction pairs “VICTREX PEEK-nitrided titanium polyaryletherketone material”, plunger supports with suction valves, cylinder block for plungers and pump bearings are also made. Thus, when the valve slides along the seat guide, a friction pair is provided that works in the absence of lubrication and without corrosion in aggressive sea water.
The prototype pump is designed to work with oil as a working fluid, in this regard, it does not cause problems with the lubrication of the used rolling bearings. This cannot be done in the design of the new pump, since the rolling bearings cannot work without proper lubrication in water, especially in salt water. Therefore, the new design of the pump uses plain bearings, in which the friction pair “VICTREX PEEK - nitrated titanium polyaryletherketone” is also used.
The main advantage of choosing VICTREX PEEK polyaryletherketone material for working with sea water is the following highly effective combination of properties of this material:
- good anti-friction properties;
- high mechanical strength;
- the ability to work in a pair of friction with titanium in conditions of insufficient or even absent lubrication.
Another advantage of the proposed design of the plunger with the valve is the lower mass of the plunger compared to the prototype. Weight reduction is achieved by performing a hollow plunger. At the same time, in order to maintain the pressure supply to the shoe support and to provide fluid supply to the suction openings, the seat of the plunger under the suction valve is made in the form of a hollow rod screwed into the plunger. Reducing the mass of the plunger reduces the inertia forces acting on it and, consequently, the total load on the plunger and its mating elements. This circumstance will lead to an improvement in the fatigue strength of the plunger and the mating parts of the pump.
In addition, in the new pump, unlike the prototype, the leakage of the working fluid through the plungers with suction valves is reduced, i.e. in the gap between the plungers and the cylinders in which they are located, and therefore, the pump efficiency is increased. For this purpose, in the proposed design, there is no bore in the plunger for supplying fluid to the suction valve and sealing is performed along the entire length of the plunger.
List of drawings
FIG. 1 is a drawing of an axial plunger pump with plungers with proposed suction valves;
FIG. 2 - a separate plunger with a suction valve;
FIG. 3 - separately suction valve.
The implementation of the invention
In FIG. 1, 2, 3 among all the positions of the pump elements to explain the invention, it is sufficient to describe the following positions: 3 - shoe insert; 4 - valve; 5 - ring: 6 - retaining ring: 7 - shoe clip; 8 - a plunger; 9 - a saddle; 11 - a sealing ring; 12 - spring. It is worth noting that the details “shoe insert”, “shoe holder” and “ring” do not affect the operation of the suction valve, but are part of the plunger, therefore, are present in the drawing and description.
The axial-plunger pump with valve distribution consists of a housing, a cylinder block, plungers, a shaft with a cam installed in a plain bearing, suction and discharge valves. When the shaft rotates, the inclined plane of the cam interacts with the supports of the plungers, while the plungers reciprocate in the cylinder block. During the reverse stroke of the plunger, a suction valve opens in it and fluid through it flows from the pump housing into the cylinder. In the direct stroke of the plunger, the liquid is displaced through the discharge valve from the cylinder into the cover manifold and then into the discharge cavity.
Typically, in valve-distributed pumps, the valve is located on the stationary parts of the pump. In this case, the valve opens and closes due to the forces of fluid pressure and spring forces acting on it. In the proposed design, the suction valve is located at the end of the moving part - on the plunger. The annular valve shutoff element (key 4) is pressed by the spring (key 12) against the seat (key 9). The saddle is screwed into the plunger (key 8).
During the reverse stroke (to the left) of the plunger, the annular valve shutter moves away from the seat, fluid through the holes (8.1) in the rear of the plunger and the holes (9.1) in the seat enters the pump working chamber. In the forward stroke (to the right) of the plunger, the annular valve shut-off element is pressed against the seat and overlaps the holes (9.1) in it. Thus, when the plunger moves, the valve acts, in addition to the fluid pressure and spring forces, the inertia force. Moreover, this force helps to open the valve during the reverse stroke of the plunger and to close with the forward stroke of the plunger. In this regard, it is possible to reduce the stiffness of the pressing ring locking element of the spring valve. This, in turn, will lead to a decrease in the differential pressure required to open the valve and, consequently, to a decrease in the minimum required pressure at the pump inlet. This advantage is significant when the pump is operating at shallow water immersion depths, since in order to ensure pump-free operation at a shallow water immersion depth, the required pressure at the pump inlet is usually provided with a special additional pump. If the proposed design allows you to reduce the minimum required pressure at the pump inlet, then the need for an additional pump disappears.
In the design of the pump with a valve distribution system, there is no friction unit for the cylinder block - an end distributor (an essential element in the design of pumps with a spool distribution system), which is difficult to do in conditions of poor lubricity due to the low viscosity of water, including sea water. Another advantage of the valve distribution system is tightness. This is especially important in view of the low viscosity of any water in principle, since the lower the viscosity of the liquid, the greater the leakage and, accordingly, the lower the efficiency of the pump.
Due to the low lubricity of seawater, it also becomes necessary to provide specific friction pairs. In this design, the VICTREX PEEK polyaryletherketone polymer and titanium with a nitrided surface are combined in friction pairs. Of the polymeric material polyaryletherketone VICTREX PEEK WG102, the aforementioned suction and discharge valves are made. The mass of such valves is significantly less than metal, which ensures less delay in the valve seating on the seat. A suction valve (pos. 4), a shoe insert (pos. 3) and a ring (pos. 5) (note: sealing ring (pos. 11) - rubber) are made of the polymeric material of VICTREX PEEK WG102 polymeric material. The remaining parts of the suction valve are made of titanium (or titanium alloy), which is not susceptible to electrolytic corrosion in saltwater.

Claims (1)

  1. The suction valve of the axial-plunger hydraulic pump located at the end of the plunger and consisting of an annular locking element, a seat at the end of the plunger and a spring pressing the annular locking element of the valve to the seat, while the suction valve is made with the possibility of opening holes in the valve seat to allow fluid to pass into the plunger during the course of the plunger for suction and closing them during the course of the plunger for injection, characterized in that the annular locking element of the specified valve is made of polymer resistant to sea water - VICTREX PEEK polyaryletherketone, and the valve seat is made of an anticorrosive titanium alloy, while the VICTREX PEEK polyaryletherketone bonded material is nitrided titanium; the plunger itself is made hollow, and the seat of the suction valve is made in the form of a hollow rod screwed into the plunger.
RU2014130157/06A 2014-07-22 2014-07-22 Suction valve of axial plunger hydraulic pump RU2568021C1 (en)

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RU2014130157/06A RU2568021C1 (en) 2014-07-22 2014-07-22 Suction valve of axial plunger hydraulic pump

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RU2568021C1 true RU2568021C1 (en) 2015-11-10

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653388U (en) * 1953-01-05 1953-04-02 Diemer & Fastenrath DOUBLE-WALLED TOWER STOVE WITH SPECIAL STEAM GUIDE.
SU1138534A1 (en) * 1982-11-10 1985-02-07 Ленинградский Ордена Ленина И Ордена Красного Знамени Механический Институт Axial-plunger hydraulic machine
US5354181A (en) * 1992-02-28 1994-10-11 Hydro Rene Leduc Hydraulic piston pumps equipped with suction valve
CN1218874A (en) * 1997-11-28 1999-06-09 华中理工大学 Novel axial multiple plunger volumetric water pump
WO2003056176A1 (en) * 2001-12-28 2003-07-10 Nuovo Pignone Holding S.P.A. Self-lubricating plastics material for sealing elements

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653388U (en) * 1953-01-05 1953-04-02 Diemer & Fastenrath DOUBLE-WALLED TOWER STOVE WITH SPECIAL STEAM GUIDE.
SU1138534A1 (en) * 1982-11-10 1985-02-07 Ленинградский Ордена Ленина И Ордена Красного Знамени Механический Институт Axial-plunger hydraulic machine
US5354181A (en) * 1992-02-28 1994-10-11 Hydro Rene Leduc Hydraulic piston pumps equipped with suction valve
CN1218874A (en) * 1997-11-28 1999-06-09 华中理工大学 Novel axial multiple plunger volumetric water pump
WO2003056176A1 (en) * 2001-12-28 2003-07-10 Nuovo Pignone Holding S.P.A. Self-lubricating plastics material for sealing elements

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MM4A The patent is invalid due to non-payment of fees

Effective date: 20170723

NF4A Reinstatement of patent

Effective date: 20190516