EP0021202B1 - Thermostatic expansion valve - Google Patents

Thermostatic expansion valve Download PDF

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Publication number
EP0021202B1
EP0021202B1 EP80103170A EP80103170A EP0021202B1 EP 0021202 B1 EP0021202 B1 EP 0021202B1 EP 80103170 A EP80103170 A EP 80103170A EP 80103170 A EP80103170 A EP 80103170A EP 0021202 B1 EP0021202 B1 EP 0021202B1
Authority
EP
European Patent Office
Prior art keywords
cup
shaped body
valve
corrugated tube
expansion valve
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
Application number
EP80103170A
Other languages
German (de)
French (fr)
Other versions
EP0021202A1 (en
Inventor
Rudibert Dipl.-Ing. Götzenberger
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.)
Ernst Flitsch GmbH and Co
Original Assignee
Ernst Flitsch GmbH and Co
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Filing date
Publication date
Application filed by Ernst Flitsch GmbH and Co filed Critical Ernst Flitsch GmbH and Co
Publication of EP0021202A1 publication Critical patent/EP0021202A1/en
Application granted granted Critical
Publication of EP0021202B1 publication Critical patent/EP0021202B1/en
Expired legal-status Critical Current

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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
    • F25B41/33—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
    • 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
    • F25B2341/0683—Expansion valves combined with a sensor the sensor is disposed in the suction line and influenced by the temperature or the pressure of the suction gas

Definitions

  • the invention relates to a thermostatic expansion valve for installation in a refrigerant circuit consisting of a compressor, condenser and evaporator, with an expansion chamber acting on the valve stem and filled with a temperature-sensitive control medium and with a passage through which the suction gas flows, into which the valve stem protrudes, the temperature of the Suction gases affect the movement of the expansion chamber.
  • a valve tappet projecting into the return duct for the refrigerant is provided, which has a blind hole in communication with the membrane chamber, in order to enable condensation of the filling located in the membrane chamber in the space through which the refrigerant flows, so that this filling responds to the temperature of the back-flowing refrigerant (DE-A 2 001 713).
  • control takes place as a function of the temperature and pressure conditions prevailing in the channel through which the suction gas flows, in that the portion of the suction gas channel receiving the valve tappet is connected to a chamber delimited by the membrane, so that the temperature of the in the Suction channel flowing refrigerant acts on the outer surface of the membrane delimiting the membrane chamber.
  • Thermostatic valves of this type have a very high response speed and, consequently, an oscillating mode of operation.
  • the part of the valve stem protruding into the suction channel is enclosed by a sleeve made of cold-resistant plastic of low thermal conductivity in the latter expansion valve.
  • the invention has for its object to effect the damping of the valve stem movements in expansion valves of the aforementioned type in a structurally simple manner.
  • the suction line is advantageously connected to the chamber receiving the corrugated pipe via a wide annular channel.
  • the cover closing the expansion valve on the front side has a bore which is closed by means of a sealing washer which resiliently rests against the inside of the cover is held.
  • the pressure acting on this sealing washer is exerted by a spring washer resting against the bottom of the cup-shaped body or a bow spring arranged on the bottom of this body.
  • an embodiment of the expansion valve according to the invention is shown in a schematic manner.
  • an inlet 1 and an outlet 2 are provided for receiving a threaded connector each connected to the suction line.
  • Two further threaded recesses 3 and 4 are used to connect the line starting from the condenser or leading to the evaporator.
  • the valve tappet 6 is guided in a sleeve 5 inserted into the housing.
  • the upper end of the plunger lies with the interposition of a cup-shaped part against the bottom of the cup-shaped body 8, which is enclosed in its upper thick-walled area by the corrugated tube 9, which has the lower end with the annular shoulder 82 of the cup-shaped body and with its upper end is soldered to a plate 10 which covers the end of the valve housing.
  • This cover plate has a bore 101 which is closed by means of a sealing washer 11 which is pressed against the cover plate 10 by the spring washer 16. With its thin-walled free edge region 81, the cup-shaped body 8 projects into the part of the suction line located between the inlet 1 and the outlet 2.
  • a spherical valve body 12 is arranged, which bears against the valve seat 13, which is held by the upper heating spring 14, the tension of which can be adjusted by means of the threaded nipple 15.
  • a filling probe having a transverse slot at its lower end is introduced into the bore and the sealing disk 101 is pressed down by means of the latter. In this way, the filling process can be carried out in a significantly shorter time than with known expansion valves.
  • the bore 101 can also be glued or soldered.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Valve Housings (AREA)

Description

Die Erfindung betrifft ein thermostatisches Expansionsventil zum Einbau in einen aus Kompressor, Kondensator und Verdampfer bestehenden Kältemittelkreislauf, mit einer auf den Ventilstössel wirkenden und mit einem temperaturempfindlichen Steuermedium gefüllten Expansionskammer und mit einem vom Sauggas durchströmten Kanal, in den der Ventilstössel hineinragt, wobei die Temperatur des Sauggases die Bewegung der Expansionskammer beeinflusst.The invention relates to a thermostatic expansion valve for installation in a refrigerant circuit consisting of a compressor, condenser and evaporator, with an expansion chamber acting on the valve stem and filled with a temperature-sensitive control medium and with a passage through which the suction gas flows, into which the valve stem protrudes, the temperature of the Suction gases affect the movement of the expansion chamber.

Bei einem Expansionsventil dieser Gattung erfolgt die Anordnung eines in den Rücklaufkanal für das Kältemittel hineinragenden Ventilstössels, der ein mit der Membrankammer in Verbindung stehendes Sackloch aufweist, um eine Kondensation der in der Membrankammer befindlichen Füllung in dem von dem Kältemittel durchströmten Raum zu ermöglichen, so dass diese Füllung auf die Temperatur des rückströmenden Kältemittels anspricht (DE-A 2 001 713).In the case of an expansion valve of this type, a valve tappet projecting into the return duct for the refrigerant is provided, which has a blind hole in communication with the membrane chamber, in order to enable condensation of the filling located in the membrane chamber in the space through which the refrigerant flows, so that this filling responds to the temperature of the back-flowing refrigerant (DE-A 2 001 713).

Bei einer Weiterentwicklung dieses Expansionsventils erfolgt die Steuerung in Abhängigkeit von den in dem vom Sauggas durchströmten Kanal herrschenden Temperatur- und Druckverhältnissen dadurch, dass der den Ventilstössel aufnehmende Abschnitt des Sauggaskanals mit einer von der Membran begrenzten Kammer verbunden ist, so dass die Temperatur des in dem Saugkanal strömenden Kältemittels die Aussenfläche der die Membrankammer begrenzenden Membran beaufschlagt.In a further development of this expansion valve, the control takes place as a function of the temperature and pressure conditions prevailing in the channel through which the suction gas flows, in that the portion of the suction gas channel receiving the valve tappet is connected to a chamber delimited by the membrane, so that the temperature of the in the Suction channel flowing refrigerant acts on the outer surface of the membrane delimiting the membrane chamber.

Thermostatische Ventile dieser Art, deren Steuerorgan der Einwirkung des strömenden Sauggases ausgesetzt ist, weisen eine sehr hohe Ansprechgeschwindigkeit und demzufolge eine pendelnde Arbeitsweise auf. Um die Ansprechgeschwindigkeit zu vermindern und störende Pendelschwingungen zu dämpfen, ist bei dem zuletzt genannten Expansionsventil der in den Saugkanal hineinragende Teil des Ventilstössels von einer Hülse aus kältefestem Kunststoff von geringer Wärmeleitfähigkeit umschlossen.Thermostatic valves of this type, the control member of which is exposed to the action of the flowing suction gas, have a very high response speed and, consequently, an oscillating mode of operation. In order to reduce the response speed and dampen disturbing pendulum vibrations, the part of the valve stem protruding into the suction channel is enclosed by a sleeve made of cold-resistant plastic of low thermal conductivity in the latter expansion valve.

Eine Expansionskammer für einen Ventilstössel als ein das obere Ende des Ventilstössels aufnehmender becherförmiger Körper auszubilden, ist an sich bei Kraftstoffbehältern zur Aufrechterhaltung eines konstanten Innendrucks bekannt (US-A 2 639 726).Designing an expansion chamber for a valve tappet as a cup-shaped body which receives the upper end of the valve tappet is known per se in fuel tanks for maintaining a constant internal pressure (US Pat. No. 2,639,726).

Der Erfindung liegt die Aufgabe zugrunde, die Dämpfung der Ventilstösselbewegungen bei Expansionsventilen der vorgenannten Gattung auf eine konstruktiv einfache Weise zu bewirken.The invention has for its object to effect the damping of the valve stem movements in expansion valves of the aforementioned type in a structurally simple manner.

Diese Aufgabe wird gemäss der Erfindung durch eine Ausbildung des Expansionsventils erreicht, das die im Kennzeichen des Patentanspruchs 1 aufgeführten Merkmale aufweist. Die Saugleitung ist hierbei vorteilhafterweise über einen breiten Ringkanal mit der das Wellrohr aufnehmenden Kammer verbunden.This object is achieved according to the invention by designing the expansion valve which has the features listed in the characterizing part of patent claim 1. The suction line is advantageously connected to the chamber receiving the corrugated pipe via a wide annular channel.

Um den von dem Wellrohr einerseits und dem dickwandigen Teil des becherförmigen Körpers anderseits begrenzten Raum in einfacher Weise mit dem temperaturempfindlichen Steuermedium füllen zu können, weist der das Expansionsventil stirnseitig abschliessende Deckel eine Bohrung auf, die mittels einer an die Innenseite des Dekkels federnd anliegender Dichtungsscheibe geschlossen gehalten wird. Der auf diese Dichtungsscheibe wirkende Druck wird von einer gegen den Boden des becherförmigen Körpers anliegenden Federscheibe oder einer am Boden dieses Körpers angeordneten Bügelfeder ausgeübt.In order to be able to easily fill the space delimited by the corrugated pipe on the one hand and the thick-walled part of the cup-shaped body on the other hand with the temperature-sensitive control medium, the cover closing the expansion valve on the front side has a bore which is closed by means of a sealing washer which resiliently rests against the inside of the cover is held. The pressure acting on this sealing washer is exerted by a spring washer resting against the bottom of the cup-shaped body or a bow spring arranged on the bottom of this body.

In der Zeichnung ist ein Ausführungsbeispiel des erfindungsgemässen Expansionsventils in schematischer Weise dargestellt. Im oberen Teil des Gehäuses des Expansionsventils ist ein Einlass 1 und ein Auslass 2 zur Aufnahme je eines an die Saugleitung angeschlossenen Gewindestutzens vorgesehen. Zwei weitere mit einem Gewinde versehene Aussparungen 3 und 4 dienen zum Anschluss der vom Kondensator ausgehenden bzw. zum Verdampfer führenden Leitung. In einer in das Gehäuse eingesetzten Hülse 5 wird der Ventilstössel 6 geführt. Das obere Ende des Stössels liegt unter Zwischenschaltung eines napfförmigen Teils gegen den Boden des becherförmigen Körpers 8 an, der in seinem oberen dickwandigen Bereich von dem Wellrohr 9 umschlossen wird, das mit seinem unteren Ende mit der Ringschulter 82 des becherförmigen Körpers und mit seinem oberen Ende mit einer das Ventilgehäuse stirnseitig abdeckenden Platte 10 verlötet ist. Diese Deckplatte weist eine Bohrung 101 auf, die mittels einer Dichtungsscheibe 11 verschlossen wird, die von der Federscheibe 16 gegen die Deckplatte 10 gepresst wird. Mit seinem dünnwandigen freien Randbereich 81 ragt der becherförmige Körper 8 in den zwischen dem Einlass 1 und dem Auslass 2 gelegenen Teil der Saugleitung hinein. Am unteren Ende des Ventilstössels 6 ist ein kugelförmiger Ventilkörper 12 angeordnet, der gegen den Ventilsitz 13 anliegt, der von der Oberhitzungsfeder 14 gehalten wird, deren Spannung mittels des Gewindenippels 15 eingestellt werden kann.In the drawing, an embodiment of the expansion valve according to the invention is shown in a schematic manner. In the upper part of the housing of the expansion valve, an inlet 1 and an outlet 2 are provided for receiving a threaded connector each connected to the suction line. Two further threaded recesses 3 and 4 are used to connect the line starting from the condenser or leading to the evaporator. The valve tappet 6 is guided in a sleeve 5 inserted into the housing. The upper end of the plunger lies with the interposition of a cup-shaped part against the bottom of the cup-shaped body 8, which is enclosed in its upper thick-walled area by the corrugated tube 9, which has the lower end with the annular shoulder 82 of the cup-shaped body and with its upper end is soldered to a plate 10 which covers the end of the valve housing. This cover plate has a bore 101 which is closed by means of a sealing washer 11 which is pressed against the cover plate 10 by the spring washer 16. With its thin-walled free edge region 81, the cup-shaped body 8 projects into the part of the suction line located between the inlet 1 and the outlet 2. At the lower end of the valve lifter 6, a spherical valve body 12 is arranged, which bears against the valve seat 13, which is held by the upper heating spring 14, the tension of which can be adjusted by means of the threaded nipple 15.

Die ungleiche Wandstärke des von dem Wellrohr 9 umschlossenen Bereichs und des in die Saugleitung hineinragenden Randbereichs 81 des becherförmigen Körpers 8, ergibt eine wirksame Dämpfung der Bewegungen des Ventilstössels 6.The uneven wall thickness of the area enclosed by the corrugated tube 9 and of the edge area 81 of the cup-shaped body 8 projecting into the suction line results in an effective damping of the movements of the valve tappet 6.

Zur Füllung des von dem Wellrohr 9 umschlossenen Raums mit einem temperaturempfindlichen Steuermedium sowie zu seiner vorhergehenden Evakuierung wird in die Bohrung eine an ihrem unteren Ende einen Querschlitz aufweisende Füllsonde eingeführt und mittels dieser die Dichtungsscheibe 101 niedergedrückt. Auf diese Weise kann der Füllvorgang in wesentlich kürzerer Zeit als bei bekannten Expansionsventilen durchgeführt werden. Die Bohrung 101 kann zusätzlich noch verklebt oder verlötet werden.To fill the space enclosed by the corrugated tube 9 with a temperature-sensitive control medium and for its previous evacuation, a filling probe having a transverse slot at its lower end is introduced into the bore and the sealing disk 101 is pressed down by means of the latter. In this way, the filling process can be carried out in a significantly shorter time than with known expansion valves. The bore 101 can also be glued or soldered.

Claims (3)

1. A thermostatic expansion valve for incorporation in a refrigerant circuit consisting of a compressor, a condenser and an evaporator, and having an expansion chamber (8, 9, 10) filled with a temperature-sensitive control medium, and comprising a duct (1, 2) through which a suction gas flows and into which the valve stem (6) projects, the temperature of the suction gas influencing the movement of the expansion chamber (8, 9, 10), characterized in that the member acting on the valve stem (6) is formed as a cup-shaped body (8), which receives the upper end of the stem (6) and projects into a space surrounded by a corrugated tube (9), which body has, in its wall zone surrounded by the corrugated tube (9), a greater wall-thickness than in the edge zone (81) projecting into the duct (1, 2) through which the suction gas flows, the corrugated tube (9) being connected, at one of its ends, to a cover plate (10) of the valve housing and, at its other end, to an annular shoulder (82) on the cup-shaped body (8).
2. An expansion valve according to claim 1, characterized in that the part of the cup-shaped body (8) that is surrounded by the corrugated tube (9) is arranged in a cylindrical recess in the valve housing, which recess is connected to the duct (1, 2) through which the suction gas flows, by an annular duct surrounding the edge zone (81) of the cup-shaped body (81).
3. An expansion valve according to claims 1 and 2, characterized in that a spring (16), which presses a sealing disc (11) against a hole (101) formed in the cover plate (10), is arranged on the outer face of the top of the cup-shaped body (8).
EP80103170A 1979-06-06 1980-06-06 Thermostatic expansion valve Expired EP0021202B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792922872 DE2922872A1 (en) 1979-06-06 1979-06-06 THERMOSTATIC EXPANSION VALVE
DE2922872 1979-06-06

Publications (2)

Publication Number Publication Date
EP0021202A1 EP0021202A1 (en) 1981-01-07
EP0021202B1 true EP0021202B1 (en) 1983-11-23

Family

ID=6072567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103170A Expired EP0021202B1 (en) 1979-06-06 1980-06-06 Thermostatic expansion valve

Country Status (6)

Country Link
US (1) US4344566A (en)
EP (1) EP0021202B1 (en)
JP (1) JPS55163379A (en)
BR (1) BR8003484A (en)
DE (2) DE2922872A1 (en)
DK (1) DK241080A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819443A (en) * 1987-06-30 1989-04-11 Fujikoki America, Inc. Expansion valve
JP3305039B2 (en) * 1993-04-22 2002-07-22 株式会社不二工機 Temperature expansion valve
JP3637651B2 (en) * 1995-03-22 2005-04-13 株式会社デンソー Thermal expansion valve
FR2743139B1 (en) * 1995-12-27 1998-02-13 Valeo Climatisation THERMOSTATIC REGULATOR FOR AIR CONDITIONING APPARATUS, PARTICULARLY A MOTOR VEHICLE
JPH10288424A (en) * 1997-04-11 1998-10-27 Fuji Koki Corp Temperature type expansion valve
JP2000016068A (en) * 1998-07-08 2000-01-18 Sanden Corp Automatic temperature expansion valve
DE102004057320A1 (en) * 2004-11-27 2006-06-01 Karl-Heinz Best Device for monitoring a wind energy installation comprises a data acquisition unit having a load sensor to detect the load operation of the installation and a wind sensor
CN109519576B (en) * 2019-01-04 2024-07-19 上海金鋆制冷控制器有限公司 Water volume pressure regulating valve

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075646B (en) * 1960-02-18 Klemenz Stutt gart Mohrmgcn Rudolf Thermostatic Em spray valve for refrigeration systems
US1904991A (en) * 1929-02-28 1933-04-25 Frigidaire Corp Refrigerating apparatus
US1969574A (en) * 1931-11-17 1934-08-07 Robertshaw Thermostat Co Thermostat bellows assembly
FR806476A (en) * 1935-03-18 1936-12-17 Expansion valve for refrigeration machines
US2463951A (en) * 1945-05-25 1949-03-08 Detroit Lubricator Co Refrigeration expansion valve
US2639726A (en) * 1947-06-14 1953-05-26 Standard Thompson Corp Apparatus for controlling the pressure in liquid containers
DE926369C (en) * 1953-03-04 1955-04-14 Erich Herion Water control valve for refrigeration machines
US2949128A (en) * 1956-12-10 1960-08-16 American Radiator & Standard Valve
US3111816A (en) * 1958-11-07 1963-11-26 Alco Valve Co Thermostatic expansion valve with compound pressure regulating override
US3014351A (en) * 1960-03-16 1961-12-26 Sporlan Valve Co Refrigeration system and control
US3119559A (en) * 1962-08-20 1964-01-28 Gen Motors Corp Thermostatic expansion and suction line valve
US3537645A (en) * 1969-01-16 1970-11-03 Controls Co Of America Bulbless expansion valve
GB1232366A (en) * 1970-03-24 1971-05-19

Also Published As

Publication number Publication date
DE3065671D1 (en) 1983-12-29
US4344566A (en) 1982-08-17
JPS55163379A (en) 1980-12-19
DK241080A (en) 1980-12-07
BR8003484A (en) 1981-01-05
EP0021202A1 (en) 1981-01-07
DE2922872A1 (en) 1980-12-11

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