WO2001053902A1 - Nouveau dispositif de commande electrothermique - Google Patents

Nouveau dispositif de commande electrothermique Download PDF

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Publication number
WO2001053902A1
WO2001053902A1 PCT/IN2000/000027 IN0000027W WO0153902A1 WO 2001053902 A1 WO2001053902 A1 WO 2001053902A1 IN 0000027 W IN0000027 W IN 0000027W WO 0153902 A1 WO0153902 A1 WO 0153902A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
peltier
output current
variable
control device
Prior art date
Application number
PCT/IN2000/000027
Other languages
English (en)
Inventor
Surendra Shah
Original Assignee
Surendra Shah
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 Surendra Shah filed Critical Surendra Shah
Priority to AU60131/00A priority Critical patent/AU6013100A/en
Publication of WO2001053902A1 publication Critical patent/WO2001053902A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/355—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by electric heating of bimetal elements, shape memory elements or heat expanding elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
    • F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/06—Details of flow restrictors or expansion valves
    • F25B2341/068—Expansion valves combined with a sensor
    • F25B2341/0681—Expansion valves combined with a sensor the sensor is heated
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This invention relates to an electro thermal control device for producing mechanical motion using only electricity, but without using Electro-magnetic devices such as solenoids or electric motors and specifically to the use of such motion for precise execution of various control functions involving various process parameters such as temperature, flow etc.
  • the power elements in a control loop also known as operators or actuators, use hydraulic, pneumatic or electrical power to translate a control signal into linear or circular motion, which would then operate a lever or modulate a valve.
  • the first two means require a compressor or hydraulic power unit to produce a high pressure fluid, which is then metered into a cylinder, bellows or diaphragm of the operator to produce the required motion.
  • This equipment is complex, bulky, slow and inefficient.
  • the direct electric operation requires electromagnetic devices such as motors, solenoids or magnets which have the same drawbacks.
  • pneumatic or hydraulic systems operate in tandem with electric elements, thus compounding the complexity.
  • the object of the invention is to devise a simple, lightweight, novel means and method of quickly producing powerful linear, circular or curvilinear motion, caused and controlled both in forward and reverse directions only by electricity, without using any solenoids, magnets, magnetic fields, motors, resistance elements, copper coils or iron cores.
  • thermometer With a rise in temperature, the pressure of gas in the sensor bulb rises, causing a bourdon tube to move a pointer on the dial. This effect is enhanced if, instead of gas. the bulb is evacuated and then partially filled with a volatile liquid whose vapour will then fill the empty space. Liquid and vapour will establish an equilibrium, which will change as the bulb temperature rises or falls. As liquid converts into vapour and vice versa, the large change in the volume between the two states causes a greater variation in pressure than a bulb filled with a pure gas for an equal change in temperature. Thus a stronger thrust is applied to the bourdon tube causing greater movement of the pointer and making the instrument more sensitive than the gas filled unit.
  • a diaphragm or bellows can be used in place of the bourdon tube and, with an appropriate linkage, the desired motion would be produced to operate dials, switches, levers or metering devices within a control loop.
  • the method so invented is a simple, lightweight, novel means and method of quickly producing a powerful linear, circular or curvilinear motion, caused and controlled both in forward and reverse directions only by electricity, without using any solenoids, magnets, magnetic fields, motors, resistance elements, copper coils or iron cores.
  • peltier employs the peltier effect to heat or cool, by direct contact, a low volume insulated chamber, having low thermal mass, partially filled with only a volatile liquid in equilibrium with its own vapour, causing the evaporation of the liquid or condensation of the vapour, depending directly on the positive or negative flow of electric current through the peltier device, resulting in raising or lowering of the pressure within the chamber which acts on a diaphragm or bellows to produce forward or reverse motion whose speed and force are precisely controlled, within a predetermined range, by varying only the current polarity of the electrical energy fed into the peltier device.
  • a non-volatile fluid is used to produce the same action by a simple expansion or contraction.
  • the peltier device is kept in close direct thermal contact with a piece of shape memory metal (an alloy of nickel & tin) formed such that it has two stable shapes, like say straight or bent, at two different temperatures. As the peltier chip is heated or cooled quickly by switching polarity of the electric current, the metal will snap between the two states, thus operating a switch, or moving a lever to produce motion.
  • a rod of copper, a bimetal strip or disc, or any other material having a high coefficient of thermal expansion can also be used with the peltier device instead of shape memory alloy.
  • the distinctive novelty is that the peltier device can heat or cool quickly depending upon the polarity and the current. As used in the above invention, it amplifies the effect of a small change in the measured variable and applies a strong corrective force to the controlling device. It is like adding power steering to a car.
  • figure 1 shows basic design
  • figure 2 shows precision Refrigeration Control
  • figure 3 shows a Magnetless electro-mechanical switch.
  • An electro-thermal control device which comprises a Sensor (1) which measure the variable to be controlled and sends the signal via the Sensor Line (2) to the Controller (3) having one or more variable set points, each operating a Relay (4), the relay output is further sent through a Cyclic Timer (5) to the Variable D.C. Power Supply (6), the Output Current (7) generated is raised, lowered or changed in polarity in response to the signal form the Cyclic Timer (5) from the Controller (3), the Output Current (7) of which further passes through one or more Peltier Chips (8) which are attached to the Thermo-Hydraulic or a Thermo-Mechanical Operator (9), the Peltier Chips (8) will heat or cool the Thermo
  • the Cyclic Timer (5) inactivates the control device for a set interval so as to prevent over control and hunting.
  • An electro-thermal control device which comprises a Sensor (1) measures the temperature of the air going into the Cooling Coil (11) and sends it to the Temperature Controller (3) via the Sensor Line (12). The Temperature Controller (3) then compares it to the set point. The Variable D.C. Power Supply (6) then adjusts the Output Current (7) being supplied to the Peltier Chips (8) causing a change in its surface temperature. The cold side of the Peltier Chips (8) is in contact with the Fluid Filled Bulb (8) attached to the Expansion Valve (14) by the Capillary Tube (15).
  • the Peltier Chip (8) changes the temperature of the fluid in the Fluid Filled Bulb (13) and causes the fluid to either evaporate or condense, thereby changing the pressure of the fluid acting on the Diaphragm (16) of the Expansion Valve (14) which moves the Refrigerant Metering Needle (17) in or out of the Valve Orifice (18).
  • the Cyclic Timer (5) inactivates the control device for a set interval so as to prevent overcontrol and hunting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Temperature (AREA)

Abstract

Nouveau dispositif de commande électrothermique destiné à produire un mouvement mécanique à l'aide de la seule électricité. Ledit dispositif comporte un capteur (1) destiné à mesurer la variable, qui envoie des signaux via une ligne (2) de capteur à l'organe de commande (3). L'organe de commande (3) possède un ou plusieurs points de consigne faisant chacun fonctionner un relais (4). La sortie du relais est envoyée, via le dispositif de chronométrage (5) de cycles de travail, au dispositif d'alimentation (6) en courant continu variable qui ajuste le courant de sortie (7). Le courant de sortie est variable en raison de la polarité du dispositif de chronométrage (5) de cycles de travail. Le courant de sortie (7) est ensuite amené à traverser des puces (8) à effet Peltier, dont l'un ou l'autre côté est en contact avec une ampoule (13) remplie de fluide communiquant avec une soupape de détente (14) par un tube capillaire (15). Les puces à effet Peltier chauffent ou refroidissent le fluide contenu dans l'ampoule (13), si bien que ledit fluide se détend, se contracte, se condense ou s'évapore. Par conséquent, la pression sur la membrane (16) de la soupape de détente (14) déplace le pointeau (17) de dosage du réfrigérant en introduisant ledit pointeau dans l'orifice (18) de soupape ou en l'en éloignant, ce qui régule le flux de réfrigérant et entraîne l'effet de refroidissement par pénétration du réfrigérant dans le serpentin (11) de refroidissement.
PCT/IN2000/000027 2000-01-21 2000-03-22 Nouveau dispositif de commande electrothermique WO2001053902A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60131/00A AU6013100A (en) 2000-01-21 2000-03-22 A novel electro-thermal control device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN68MU2000 2000-01-21
IN68/MUM/2000 2000-01-21

Publications (1)

Publication Number Publication Date
WO2001053902A1 true WO2001053902A1 (fr) 2001-07-26

Family

ID=11097208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2000/000027 WO2001053902A1 (fr) 2000-01-21 2000-03-22 Nouveau dispositif de commande electrothermique

Country Status (2)

Country Link
AU (1) AU6013100A (fr)
WO (1) WO2001053902A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7293412B2 (en) 2003-03-21 2007-11-13 Prospective Concepts Ag Electrically variable pneumatics structural element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932994A (en) * 1974-02-06 1976-01-20 General Electric Company Thermal actuator
US4879467A (en) * 1986-12-23 1989-11-07 Universite De Metz Apparatus for the translatory manipulation of an element such as an axle
JPH11223426A (ja) * 1998-02-09 1999-08-17 Showa Alum Corp カーエアコン用膨張弁

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932994A (en) * 1974-02-06 1976-01-20 General Electric Company Thermal actuator
US4879467A (en) * 1986-12-23 1989-11-07 Universite De Metz Apparatus for the translatory manipulation of an element such as an axle
JPH11223426A (ja) * 1998-02-09 1999-08-17 Showa Alum Corp カーエアコン用膨張弁

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7293412B2 (en) 2003-03-21 2007-11-13 Prospective Concepts Ag Electrically variable pneumatics structural element

Also Published As

Publication number Publication date
AU6013100A (en) 2001-07-31

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