Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
  • F15B1/02—Installations or systems with accumulators
  • F15B1/04—Accumulators
  • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
  • F15B1/22—Liquid port constructions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
  • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators

Definitions

• the invention relates to a hydraulic damper for attenuating pressure and / or sound vibrations in systems for the operation of which pressurized fluids can be used.
• system-related processes of different types can lead to pressure fluctuations, for example by suddenly connecting rooms with different pressure levels, actuating shut-off and control valves with short opening and closing times and in particular by non-uniformities when operating positive displacement pumps, resulting in pump pulsations, or even Activation or deactivation of positive displacement pumps.
• hydraulic dampers can be based on the principle of hydropneumatic bladder and membrane accumulators or can be designed as reflection dampers (silencers).
• a general requirement for the effectiveness of hydraulic dampers is that the damper housing encloses a sufficiently large volume, which in turn leads to correspondingly large dimensions of the damper housing.
• the hydraulic pump contains a limited installation space at the output of which a hydraulic damper which attenuates the pressure vibrations and sound vibrations of the pump pulsation has to be connected, problems often arise due to the space requirement of a hydraulic damper to be accommodated with a sufficiently large damper housing.
• Such a problem occurs increasingly in connection with hydraulic systems of injection molding systems, where a good damping effect is required at the outlet of the hydraulic pumps in question, but in general only a very limited installation space is available for large-volume damper housings.
• the object of the invention is to provide a hydraulic damper, the construction of which enables the connection to an associated hydraulic system even with limited installation space and with a sufficiently large volume of the damper housing.
• a damper housing with a main dimension defining a longitudinal axis of the housing
• connection device assigned to the connection block for attaching the connection block and thus the damper housing to the
• damper housing in selectable rotational positions, based on a connection axis that runs transversely to the longitudinal axis of the housing.
• the damper housing can be accommodated in such an orientation in the relevant installation space that the main dimension of the damper housing extends in a direction that optimally utilizes the space.
• damper housings with an elongated design and a relatively large volume can also be accommodated in cramped machine rooms.
• the possibility offered by the invention of choosing the rotational position of the damper housing about a connecting axis running transversely to its longitudinal axis also enables a direct connection, for example at the outlet of an associated hydraulic pump. Even under cramped installation conditions, for example, hydraulic dampers of the reflection type, in which a relatively large volume of the damper housing is required, can be connected directly to a hydraulic pump in question with a limited available installation space.
• the connecting axis preferably runs at least approximately perpendicular to the main dimension of the damper housing that defines the longitudinal axis of the housing.
• connection device has a pump connection piece which forms the fluid connection between the connection block and a hydraulic pump and which can be fixed at the outlet of the hydraulic pump in selectable rotational positions related to the connection axis.
• the pump connecting piece can be the Connecting device a ring body attachable to the outlet of the pump with a ring of bores arranged along its circumference, of which those which correspond to the desired rotational positions of the connection block with respect to the connection axis, can be selected for the engagement of fastening screws provided on the connection block ,
• a connection of the hydraulic damper to the outlet of the pump is possible in rotation steps which correspond to the division of the bores of the bore ring in the pump connection piece.
• the pump connection piece has a circular end flange which can be fixed in the selected rotational position, with reference to the connecting axis, by means of semi-ring-type SAE flange clamping jaws which can be screwed to the SAE connecting parts of the pump outlet, a stepless selection of the rotational positions is possible.
• FIG. 1 is a side view of an exemplary embodiment of the hydraulic damper according to the invention, drawn in a highly schematically simplified manner;
• FIG. 2 shows a horizontal section of the embodiment of FIGS. 1 and 1 drawn on a larger scale than FIG. 1
• FIG. 3 shows a perspective oblique view of an end region of a second exemplary embodiment of the hydraulic damper, which is drawn on an even larger scale and broken away and broken off, and which is connected to the outlet of a hydraulic pump via an SAE connection.
• 1 and 2 show a first embodiment of the invention, which is a reflection damper (silencer) which has an elongated damper housing 1, the main dimension of which defines a housing longitudinal axis 3.
• the damper housing 1 is in fluid connection at its one end on the right in the figures with a connection block 5, which in turn is connected via a pump connection piece 7 to the outlet of a hydraulic pump (not shown).
• the storage housing 1 contains a damping tube 9 which extends coaxially to the longitudinal axis 3 between the inlet end 11 and outlet end 13 of the damper housing 1.
• the damping tube 9 has slot openings 15 in the region of its half length for coupling the fluid vibrations in the damping tube 9 to the fluid volume 17 surrounding it within the damper housing 1. Bores 19 form a permanent ventilation of the space containing the volume 1 7, so that the hydraulic damper does not need to be prefilled for starting because air accumulations are discharged through the bores 1 9.
• the damper housing each has an internal thread 21, into which screw-in pieces 23 are screwed, in the inner bore of which is concentric with the longitudinal axis 3, the ends of the damping tube 9 are received.
• the damping tube 9 is elastically supported by O-rings 25 seated in the inner bore of the screw-in pieces 23, so that the tube 9 does not generate any rattling noises during operation without narrow tolerances being necessary.
• connection block 5 forms with its inner chamber 33, which is in fluid communication with the damper housing 1, a prechamber for the resonator system located in the damper housing 1. With its bottom-side opening 35, the chamber 33 of the connection block 5 is in fluid communication with the outlet of the hydraulic pump (not shown) through the pump connection 7.
• connection block 5 has four bores 37 for the engagement of fastening screws, not shown, with which the connection block 5 can be screwed to the pump connection piece 7.
• 1 and 2 which is designed as an annular body and is in turn connectable to the outlet of the hydraulic pump, has a ring of bores 39 for interaction with the bores 37 on the connecting block, which bores are concentric with a connecting axis 41, which is perpendicular to the longitudinal axis 3 of the housing and is defined by the center of the opening 35 connecting the chamber 33 to the hydraulic pump, is arranged on the same radius as the bores 37 of the connection block 5.
• connection block 5 can be rotated about the connection axis 41 in order to make an alignment between the desired bores 39 of the bore ring on the pump connection piece 7 and the bores 37 on the connection block 5, so that the damper housing 1 with its longitudinal axis 3 relates to the desired rotational positions, based on the connection axis 41 can be aligned.
• the longitudinal extent of the damper housing 1 can therefore be rotated into a position in which an optimal use of space is given in the respective installation conditions. In other words, this means that even with difficult installation conditions, relatively large-volume damper housings 1 can be accommodated.
• the setting of the rotational position of the damper housing 1 can take place in rotational steps which correspond to the division of the bores 39 on the circumference of the pump connection piece 7 designed as an annular body
• the exemplary embodiment of FIG. 3 enables the rotational position to be adjusted continuously of the damper housing 1 about the connecting axis 41.
• the pump connection piece 7 in the second exemplary embodiment is not designed as an annular body with a circumferential bore ring, but in the form of a circular cylindrical hollow body which serves as a fluid supply pipe which connects the inner chamber 3 of the connection block 5 with the schematically indicated in Fig. 3, designated 43 of the hydraulic pump.
• the hollow body of the pump connecting piece 7, which is concentric with the connecting axis 41, has a wall opening 45 for the fluid connection with the inner chamber 33 of the connecting block 5, said wall opening being aligned with the longitudinal axis 3 of the damper housing 1.
• the pump connection piece 7 At the open end protruding from the connection block 5, which is to be attached for the fluid inlet at the pump outlet 43, the pump connection piece 7 has an end flange 47.
• the pump connection piece 7 can be fixed at the pump outlet 43 by means of half-ring-like flange clamping jaws 49, as are customary for connection connections according to the SAE standard 0 518).
• the rotational position about the connecting axis 41 can be selected continuously as desired.
• damper housing 1 of a reflection damper shown in the two exemplary embodiments
• damper systems of another function could equally be attached to the connection block 5, for example hydraulic dampers, which are based on the principle of hydropneumatic bladder and diaphragm accumulators.
• the hydraulic damper according to the invention can be delivered in the form of original equipment for a specific machine type of a plastic injection molding machine. Depending on the space available on the respective machine, preferred holes are then provided on the pump connection piece via the existing drilling pattern, and a complicated drilling pattern on the pump connection piece can then be dispensed with in the case of subsequent deliveries; on the contrary, it is then possible to select a specific drilling pattern in which the predefined hydraulic damper assumes a desired position on a plastic injection molding machine in relation to the type of machine intended for it.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Details Of Reciprocating Pumps (AREA)
• Pipe Accessories (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Apparatuses For Generation Of Mechanical Vibrations (AREA)
• Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=29224529

Family Applications (1)

Country Status (6)

Families Citing this family (5)

Family Cites Families (17)

• 2002
  • 2002-04-17 DE DE10217081A patent/DE10217081A1/de not_active Withdrawn
• 2003
  • 2003-04-03 EP EP03714916A patent/EP1495231B1/fr not_active Expired - Lifetime
  • 2003-04-03 US US10/511,583 patent/US20050129549A1/en not_active Abandoned
  • 2003-04-03 JP JP2003584504A patent/JP4125680B2/ja not_active Expired - Fee Related
  • 2003-04-03 DE DE50303482T patent/DE50303482D1/de not_active Expired - Lifetime
  • 2003-04-03 WO PCT/EP2003/003460 patent/WO2003087584A1/fr active IP Right Grant
  • 2003-04-03 AT AT03714916T patent/ATE327439T1/de not_active IP Right Cessation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events