US3585964A - Apparatus operable by pressure fluid to generate pressure waves in a medium - Google Patents

Apparatus operable by pressure fluid to generate pressure waves in a medium Download PDF

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Publication number
US3585964A
US3585964A US828157A US3585964DA US3585964A US 3585964 A US3585964 A US 3585964A US 828157 A US828157 A US 828157A US 3585964D A US3585964D A US 3585964DA US 3585964 A US3585964 A US 3585964A
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US
United States
Prior art keywords
pressure
valve
valves
medium
pressure fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US828157A
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English (en)
Inventor
Per Olof Skoldberg
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Electrolux AB
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Electrolux AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux AB filed Critical Electrolux AB
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Publication of US3585964A publication Critical patent/US3585964A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86389—Programmer or timer
    • Y10T137/86405—Repeating cycle
    • Y10T137/86421—Variable

Definitions

  • the present invention provides a very simple and cheap apparatus which is driven by pressure fluid, is safe in operation and has a long useful life.
  • the chief characteristic feature of the novel apparatus is that it comprises a valve system arranged in a cycle flow conduit for the pressure fluid and comprising two valves, one at each end of a channel through which extends a movable spacer rod having a length such that always either one of said valves is in its open position, the valve which is situated at the entrance for the pressure fluid having a valve body smaller than that of the other valve and being adapted to be opened by a lesser pressure than said other valve, said apparatus comprising moreover a branch tube or pipe extending from the channel and a membrance which is positioned on said branch tube, is in contact with the preferably liquid or gaseous medium to be treated and is adapted to transmit pressure variations created in said valve system to said medium in the form of pressure waves.
  • a device for reducing the rate of pressure drops arising due to said pressure variations is arranged in the return line of said cycle flow conduit for the pressure fluid.
  • the apparatus comprises a valve system in the cycle flow conduit for a pressure fluid such as for instance hydraulic oil.
  • the valve system comprises two springloaded ball valves 1 and 2 positioned at the two ends of a channel 3 such as a tube or pipe.
  • valve 1 The ball or valve body 4 of valve 1 is smaller than the ball or valve body 5 of valve 2, their sizes being for example and mm. respectively.
  • the springs 7 and 8 acting upon balls 4 and 5, respectively, are proportioned in such a manner that valve 2 requires greater pressure for being opened (opening pressure) than valve 1; these respective opening pressures may be for instance of the order of magnitude of 50-100 kg./cm.'* for valve 2 as against 10 kg./cm. for valve 1.
  • Valve 1 has an inlet 9 for admitting hydraulic oil from a pump (not shown) while valve 2 has an outlet 10 through which the oil flows back to the pump.
  • Within the channel 3 there is a spacer rod 6 which is movable back and forth together with and is secured to balls 4 and 5.
  • Rod 6 is of a length such that always either one of the valves is maintained in the open position, with a play of for instance about 1 mm.
  • each of the valve seats is tapered, and preferably comprises a conical surface.
  • the rod is guided in guide means (not shown) so that it is prevented from lateral movement in the channel 3.
  • a branch conduit ll extends'to a membrane 12 which is in contact with the medium to be acted upon by the apparatus.
  • the membrane is made of temper-hardened steel.
  • the apparatus is operated as follows:
  • valve 1 In the starting position of the apparatus (as shown in the drawing), valve 1 is open and valve 2 is closed due to the fact that valve 2 has a stronger spring and a larger ball.
  • valve 2 When hydraulic oil of a pressure higher than the opening pressure of valve 2 is pumped in through inlet 9 valve 2 will open and act on spacer rod 6 so as to close valve 1, and hydraulic oil will flow out and back to the pump via outlet 10.
  • valve 1 closes-valve 2 opens-valve 2 closes-valve 1 opens etc.
  • the pressure variations created thereby in the channel will act on the membrane to make it vibrate, thus generating pressure waves in the medium with which it is in contact.
  • the apparatus is employed for e.g. mass transportation in a medium it is suitable to arrange on the return line to the pump a means 13, for example a valve, for reducing the pressure drop rate in the channel.
  • a means 13 for example a valve
  • the frequency and amplitude of the pressure waves to be created depend on the practical purpose for which the apparatus is used in each individual case. Usually, the frequency is at least oscillations per second; it is dependent on the length and mass of the spacer rod, the spring coefficient of the stronger spring, and other factors.
  • the amplitudes of the pressure waves may suitably be within the range of about 50 to 100 kg.cm.
  • the apparatus according to the present invention has given extremely good results when employed for destroying contagious matter in sewage or waste water.
  • the apparatus according to this invention is to be used in the first place for generating pressure waves in liquid or gaseous media it has been found useful also for generating pressure waves in solid media. Thus for instance, it may be employed for actuating mechanical tools such as drills for rock drilling, nut tighteners of the impact type, and the like.
  • An apparatus operable by pressure fluid for generating pressure waves in a fluid medium comprising a valve system which is arranged in a cycle flow conduit for the pressure fluid and has two valves, one at each end of a channel surrounding a movable spacer rod which is respectively secured at its opposite ends to one of said valves and has a length such that always either one of the valves is in open position, the valve positioned nearest to the entrance of the pressure fluid into the apparatus having a valve body smaller than that of the other valve and being adapted for being opened by lesser pressure than said other valve, said apparatus further comprising a branch tube extending from the channel intermediate said valves and a membrane which is positioned on said branch tube, is on its side facing away from the branch tube in contact with said fluid medium, and is adapted to transmit pressure variations generated in said valve system to said medium in the form of pressure waves.
  • An apparatus further comprising means for reducing the rate of pressure drops arising due to said pressure variations, said means being arranged on the return line of said cycle flow conduit for the pressure fluid.
  • An apparatus operable by pressure fluid for generating pressure waves in a solid medium comprising a valve system which is arranged in a cycle flow conduit for the pressure fluid and has two valves, one at each end of a channel surrounding a movable spacer rod which is respectively secured at its opposite ends to one of said valves and has a length such that always either one of the valves is in open position, the valve positioned nearest to the entrance of the pressure fluid into the apparatus having a valve body smaller than that of the other valve and being adapted for being opened by lesser pressure than said other valve, said apparatus further comprising a branch tube extending from the channel intermediate said valves and a membrane which is positioned on said branch tube, is on its side facing away from the branch tube in contact with said medium, and is adapted to transmit pressure variations generated in said valve system to said medium in the form of pressure waves.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Reciprocating Pumps (AREA)
  • Multiple-Way Valves (AREA)
US828157A 1968-06-04 1969-05-27 Apparatus operable by pressure fluid to generate pressure waves in a medium Expired - Lifetime US3585964A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7474/68A SE320217B (enrdf_load_stackoverflow) 1968-06-04 1968-06-04

Publications (1)

Publication Number Publication Date
US3585964A true US3585964A (en) 1971-06-22

Family

ID=20271469

Family Applications (1)

Application Number Title Priority Date Filing Date
US828157A Expired - Lifetime US3585964A (en) 1968-06-04 1969-05-27 Apparatus operable by pressure fluid to generate pressure waves in a medium

Country Status (5)

Country Link
US (1) US3585964A (enrdf_load_stackoverflow)
DE (1) DE1927703A1 (enrdf_load_stackoverflow)
FR (1) FR2010130A1 (enrdf_load_stackoverflow)
GB (1) GB1251281A (enrdf_load_stackoverflow)
SE (1) SE320217B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100125259A1 (en) * 2008-11-19 2010-05-20 Jonathan Scott Olson Dynamic, reduced-pressure treatment systems and methods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313991A (en) * 1941-02-12 1943-03-16 Bendix Westinghouse Automotive Brake mechanism
US3326237A (en) * 1965-04-12 1967-06-20 Union Carbide Corp Repeating pneumatic timer
US3419030A (en) * 1964-11-20 1968-12-31 Gratzmuller Jean Louis Fast evacuation valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313991A (en) * 1941-02-12 1943-03-16 Bendix Westinghouse Automotive Brake mechanism
US3419030A (en) * 1964-11-20 1968-12-31 Gratzmuller Jean Louis Fast evacuation valve
US3326237A (en) * 1965-04-12 1967-06-20 Union Carbide Corp Repeating pneumatic timer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100125259A1 (en) * 2008-11-19 2010-05-20 Jonathan Scott Olson Dynamic, reduced-pressure treatment systems and methods
US8465465B2 (en) 2008-11-19 2013-06-18 Kci Licensing, Inc. Dynamic, reduced-pressure treatment systems and methods

Also Published As

Publication number Publication date
SE320217B (enrdf_load_stackoverflow) 1970-02-02
GB1251281A (enrdf_load_stackoverflow) 1971-10-27
DE1927703A1 (de) 1969-12-11
FR2010130A1 (enrdf_load_stackoverflow) 1970-02-13

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