US3771552A - Air supply apparatus for establishing constant pressure in a receiving enclosure - Google Patents

Air supply apparatus for establishing constant pressure in a receiving enclosure Download PDF

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Publication number
US3771552A
US3771552A US3771552DA US3771552A US 3771552 A US3771552 A US 3771552A US 3771552D A US3771552D A US 3771552DA US 3771552 A US3771552 A US 3771552A
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US
United States
Prior art keywords
pressure
circuit
casing
connecting means
medium
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
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English (en)
Inventor
D Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Machida Endoscope Co Ltd
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Machida Endoscope Co Ltd
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.)
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Publication date
Application filed by Machida Endoscope Co Ltd filed Critical Machida Endoscope Co Ltd
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2066—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using controlling means acting on the pressure source
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/208—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using a combination of controlling means as defined in G05D16/2013 and G05D16/2066
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7758—Pilot or servo controlled
    • Y10T137/7761—Electrically actuated valve
    • 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
    • Y10T137/85978—With pump
    • Y10T137/85986—Pumped fluid control
    • Y10T137/86002—Fluid pressure responsive

Definitions

  • ABSTRACT An air supply apparatus is provided for establishing a constant pressure in a receiving enclosure, such as a stomach or the like.
  • the apparatus includes a supply means for supplying a pressure medium with connecting means being provided for connecting this supply means to the aforesaid enclosure.
  • a timing means is moreover provided which controls the flow of. medium through the connecting means to be of pulsed form.
  • the timing means includes detecting means to determine when pressure in the connecting means reaches a predetermined level to deactivate the timing means and terminate the ,flow of medium through the connecting means.
  • the timing means is connected to and controls the supply means which is an air pump.
  • the timing means is connected to and controls valve means provided in the connecting means.
  • the detecting means includes a closed casing connected to the connecting means and v a fixed contact on the casing, therebeing provided a bellows on the casing and balancing the pressure in the casing with a reference pressure, therebeing furthermore provided a contact displaceable with the bellows to engage the first said contact, and circuit means coupled to said contacts and adapted to control the flow of medium through the connecting means to be of pulsed form.
  • the circuit means includes an RC circuit and a solenoid controlled by the RC circuit to control the supply means.
  • the detecting means may alternatively include a pressure to voltage transducer which operates in connection with a reference voltage to control either the air pump or valve means mentioned hereinabove.
  • BACKGROUND In the case of supplying air to any particular objective such as, for example, supplying air under pressure into the stomach to expand it for medical purposes, if the pressure within that objective reaches a predetermined level, the air supply can be automatically stopped. If the pressure within that objective becomes lower than the predetermined level due to any cause such as air leakage, the air supply is automatically regenerated until the pressure again reaches the predetermined level.
  • One embodiment of the invention is characterized in that an air supply by an air pump coupled through an air supply pipe to an objective section is controlled by a timer to be in the form of pulsation. Further, there is provided a detecting apparatus which responds to the internal pressure of the air supply pipe reaching a predetermined level. The apparatus is so arranged that when the detecting apparatus is operated the timer is inactive and the air supply to the objective section is suspended.
  • an apparatus for establishing a constant pneumatic pressure in a receiving enclosure comprises supply means for supplying a pressure medium, connecting means connecting said supply means to said enclosure, and timing means controlling the flow of said medium through the connecting means to be of pulsed form.
  • the timing means includes detecting means to determine when pressure in the connecting means reaches a predetermined level to deactivate the timing means and terminate the flow of said medium through the connecting means.
  • said timing means may be connected to and control the supply means.
  • valve means are provided in the connecting means, said timing means being connected to and controlling said valve means.
  • detecting means coupled to said connecting means to determine when pressure in the latter exceeds a predetermined level and to vent the connecting means thereupon.
  • said detecting means may including a closed casing connected to said connecting means, a fixed contact on said casing, a bellows on said casing and balancing the pressure in the casing with a reference pressure, a contact displaceable with the bellows to engage the first said contact, and circuit means coupled to said contacts and adapted to control the flow of medium through the connecting means to be of pulsed form.
  • the aforesaid circuit means may include an RC circuit and a solenoid controlled by the RC circuit to control said supply means or the valve means.
  • the detecting means may include a pressure to voltage transducer which balances an amplified voltage representing pressure in the connecting means with a reference voltage to determine whetherv or not the valve means or supply means should be operable.
  • FIG. 1 is a system diagram showing one embodiment of this invention
  • FIG. 2 is a schematic diagram showing an electric circuit for control of the apparatus of FIG. 1.
  • FIG. 3 is a diagram showing another embodiment of this invention.
  • FIG. 4 is a diagram showing a modified example of a detecting apparatus.
  • Component 1 is a constant-pressure type air pump which serves to supply constant-pressure air or pneumatic pressure to an objective section or receiving enclosure A through an air supply pipe 2.
  • the operation of the air pump I is so controlled by a timer 3 that the initiating and stopping of the air supply can be repeated.
  • This type of pulsating air supply is effected such that an air supply time B and an air supply stoppage time B are alternately repeated as shown diagrammatically in FIG. 1.
  • a sealed casing 4 is provided in communication with the air supply pipe 2, and a bellows 5 provided therein is in communication at its interior with ambient atmosphere. Bellows 5 is provided at its end wall with a con-' tact 6a.
  • Another contact 6b is provided on the casing 4 and faces the'contact 6a. The contact 6b is composed of a screw passing through a wall of the casing 4 so that the distance between the contact 6a and the contact 6b can be adjusted.
  • the timer 3 comprises an RC circuit.
  • a relay L is operated as a result of which a relay contact LS is closed to operate the RC circuit.
  • a relay L is energized and thereby a relay contact LS is opened and, at the same time, a contact L8,, is closed.
  • the relay L is kept energized and, during this period, the air pump 1 is kept in operation to effect one cycle of air supply 8,.
  • the relay L When the discharge of C is completed, the relay L, is deenergized.
  • the circuit for operating the air pump 1 is then opened to stop the air supply (see 8,) and at the same time the contact L8,, is closed and the RC circuit can again be energized to repeat the foregoing operation.
  • the supply air amount can be determined by changing the time constant of the RC circuit.
  • the detecting switch 7 when the detecting switch 7 is open, the RC circuit does not operate and air supply by the air pump 1 is not effected.
  • an orderly pulsed air supply to the objective section A is continuously effected by the intermittent driving of the air pump 1.
  • the pressure within the objective section A and also the pressure within the air supply pipe 2 are gradually increased to a certain level.
  • the pressure within the pipe 2 instantaneously reaches such predetermined level and the bellows 5 contracts against the action of the atmospheric pressure so that the detecting switch 7 is opened and the air supply is suspended.
  • the bellows 5 is restored to its initial expanded condition and the detecting switch 7 is again closed to resume the pulsed air supply operation.
  • the pulsed air supply and the suspension of the same are effected.
  • the difference between the internal pressure during the air supply time B and during the air supply stoppage or suspension time gradually becomes smaller, so that the time period required for restoration of the closing of the detecting switch 7, that is, the suspension time, gradually becomes longer. If this is repeated and finally the internal pressure of the objective section A reaches the predetermined level, the detecting switch 7 is finally maintained in its open condition to maintain suspension of the pulsation air supply to the objective section A. Thus bursting of the objective section A caused by excess pressure can be prevented.
  • the objective section A is a stomach or the like
  • the pressure is gradually lowered.
  • the detecting switch 7 is closed and the pulsed air supply is again effected. Thereafter, the air supply operation is automatically stopped when the pressure reaches the predetermined level.
  • the predetermined level can be selected byv adjusting the distance between the contacts 6a and 6b by threaded adjustment of the contact 6b.
  • another detecting switch 8 of the same construction as the detecting switch 7 is provided connected to the air supply passage.
  • the pressure capable of opening the switch 8 is selected to be higher than that for the detecting switch 7.
  • an electromagnetic valve 9 interposed in a discharge pipe 10, which diverts from the air supply pipe 2 is opened for discharging air and reducing the high pressure which has developed in the objective section A.
  • the air pump 1 is directly controlled by the timer 3 to effect the pulsed air supply.
  • an electromagnetic valve 11 is interposed in the air supply pipe 2 connected to the discharging side of the air pump 1, the valve 11 being so arranged that a pulsed air supply is effected by opening and closing of the valve 11 under control of the timer 3.
  • the opening and closing of the valve 11 is effected in almost the same manner as in the foregoing example, the air pump 1 of P16. 2 being replaced by the electromagnetic valve 11 in its connectionfwith timer 3.
  • a pressure detecting transducer as shown in FIG. 4 can be used.
  • the pressure within the pipe 2 is transduced into a voltage by a combination of bellows 5 and a differential transformer.
  • the voltage thus obtained is compared with the reference voltage after it is amplified.
  • the timer 3 is operated by an output from a comparison circuit so as to effect the pulsed air supply.
  • the amplified voltages becomes higher than the reference voltage, there is no output from the comparison circuit and the timer 3 is put into its inoperative condition and the pulsed air supply is suspended.
  • the differential transformer cornprises a primary winding P and a secondary winding S.
  • a rod-shaped core D moving with the bellows 5 is inserted between the windings P and S.
  • the secondary winding S comprises two windings S and S connected in series in bucking relationship. The result is that the movement of the core D is converted to a corresponding voltage in well known manner.
  • a further modification is one in which there is additionally provided a counting apparatus system for the timer 3. The number of air supply operations is counted and thereby the amount of supplied air to the objective section A can be measured.
  • Apparatus for establishing a constant pneumatic pressure in a receivingenclosure comprising supply means for supplying a pressure medium, connecting means connecting said supply means to said enclosure, and timing means controlling the flow of said medium through the connecting means to be of pulsed form, said timing means including detecting means to determine when pressure in the connecting means reaches a predetermined level to deactivate said timing means and terminate the flow of said medium through said connecting means.
  • Apparatus as claimed in claim 1 comprising valve means in said connecting means, said timing means being connected to and controlling said valve means.
  • Apparatus as claimed in claim 1 comprising further detecting means coupled to said connecting means to determine when pressure in the latter exceeds a predetermined level and to vent the connecting means thereupon.
  • said detecting means includes a closed casing connected to said connecting means, a fixed contact on said casing, a bellows on said casing and balancing the pressure in the casing with a reference pressure, a contact displaceable with the bellows to engage first said contact, and circuit means coupled to said contacts and adapted to control the flow of medium through the connecting means to be of pulsed form.
  • circuit means includes an RC circuit and a solenoid controlled by said RC circuit to control said supply means.
  • said detecting means includes a closed casing connected to said connecting means, a fixed contact on said casing, a bellows on said casing and balancing the pressure in the casing with a reference pressure, a contact displaceable with the bellows to engage first said contact, and circuit means coupled to said contacts and adapted to control the flow of medium through the connecting means to be of pulsed form.
  • circuit means includes an RC circuit and a solenoid controlled by said RC circuit to control said valve means.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Fluid Pressure (AREA)
  • Reciprocating Pumps (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
US3771552D 1971-10-26 1972-08-29 Air supply apparatus for establishing constant pressure in a receiving enclosure Expired - Lifetime US3771552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8431971A JPS4850193A (enrdf_load_stackoverflow) 1971-10-26 1971-10-26

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US3771552A true US3771552A (en) 1973-11-13

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JP (1) JPS4850193A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860000A (en) * 1973-07-12 1975-01-14 Lear Siegler Inc Medical apparatus and method for feeding and aspirating
US3867941A (en) * 1973-08-29 1975-02-25 Hans Joachim Lindemann Insufflation apparatus for introducing limited quantities of carbon dioxide into the human body for operative purposes
US4109656A (en) * 1977-02-07 1978-08-29 Sybron Corporation Apparatus for use with insufflators
US5360396A (en) * 1992-07-07 1994-11-01 Andronic Devices Ltd. Apparatus and method for improved insufflation
US5364343A (en) * 1991-03-06 1994-11-15 D.D. S.R.L. Irrigation device for use in ear canals for therapeutic or hygienic purposes
US20170003185A1 (en) * 2015-06-30 2017-01-05 Kidde Technologies Inc. Detector utilizing an adjustment screw and a bellows
US12265405B2 (en) * 2021-12-15 2025-04-01 Faurecia Autositze Gmbh Arrangement and manipulation system, and method for manipulating the flow of a fluid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031439A (enrdf_load_stackoverflow) * 1973-07-23 1975-03-27

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674092A (en) * 1952-09-04 1954-04-06 Vickers Inc Power transmission
US3155090A (en) * 1962-01-10 1964-11-03 Holter Company Hypodermic syringe operating means
US3470892A (en) * 1964-11-23 1969-10-07 Monsanto Co Pulsed solenoid control valve
US3698412A (en) * 1970-06-26 1972-10-17 Nasa Differential pressure control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5443462B2 (enrdf_load_stackoverflow) * 1972-07-14 1979-12-20

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674092A (en) * 1952-09-04 1954-04-06 Vickers Inc Power transmission
US3155090A (en) * 1962-01-10 1964-11-03 Holter Company Hypodermic syringe operating means
US3470892A (en) * 1964-11-23 1969-10-07 Monsanto Co Pulsed solenoid control valve
US3698412A (en) * 1970-06-26 1972-10-17 Nasa Differential pressure control

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860000A (en) * 1973-07-12 1975-01-14 Lear Siegler Inc Medical apparatus and method for feeding and aspirating
US3867941A (en) * 1973-08-29 1975-02-25 Hans Joachim Lindemann Insufflation apparatus for introducing limited quantities of carbon dioxide into the human body for operative purposes
US4109656A (en) * 1977-02-07 1978-08-29 Sybron Corporation Apparatus for use with insufflators
US5364343A (en) * 1991-03-06 1994-11-15 D.D. S.R.L. Irrigation device for use in ear canals for therapeutic or hygienic purposes
US5360396A (en) * 1992-07-07 1994-11-01 Andronic Devices Ltd. Apparatus and method for improved insufflation
US20170003185A1 (en) * 2015-06-30 2017-01-05 Kidde Technologies Inc. Detector utilizing an adjustment screw and a bellows
US9970837B2 (en) * 2015-06-30 2018-05-15 Kidde Technologies Inc. Detector utilizing an adjustment screw and a bellows
US12265405B2 (en) * 2021-12-15 2025-04-01 Faurecia Autositze Gmbh Arrangement and manipulation system, and method for manipulating the flow of a fluid

Also Published As

Publication number Publication date
DE2239060A1 (de) 1973-05-10
JPS4850193A (enrdf_load_stackoverflow) 1973-07-14
DE2239060B2 (de) 1976-04-29

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