CN101135387B - Expansion valve control method, and expansion valve - Google Patents

Expansion valve control method, and expansion valve Download PDF

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Publication number
CN101135387B
CN101135387B CN2007101282842A CN200710128284A CN101135387B CN 101135387 B CN101135387 B CN 101135387B CN 2007101282842 A CN2007101282842 A CN 2007101282842A CN 200710128284 A CN200710128284 A CN 200710128284A CN 101135387 B CN101135387 B CN 101135387B
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CN
China
Prior art keywords
valve
low voltage
closing feature
voltage side
valve closing
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Expired - Fee Related
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CN2007101282842A
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Chinese (zh)
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CN101135387A (en
Inventor
J·-J·罗宾
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OTO AJERHOFF GmbH
Otto Egelhof GmbH and Co KG
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OTO AJERHOFF GmbH
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    • 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
    • F25B41/325—Expansion valves having two or more valve members
    • 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
    • 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
    • F25B41/36—Expansion valves with the valve member being actuated by bimetal elements or shape-memory elements influenced by fluids, e.g. by the refrigerant
    • 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
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • 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
    • F25B2341/063—Feed forward expansion valves
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide

Abstract

The invention relates to a method for controlling an expansion valve, in particular for vehicle air-conditioning systems operated with CO2 as the refrigerant, with a valve housing which has a feed opening and a removal opening, with a valve-closing member which closes a valve seat of a passage opening arranged between the feed and removal openings, and with a resetting device which acts in the closing direction of the valve-closing member, an adjusting element, which is assigned to the valve-closing member, on the low-pressure side being activated via a predetermined threshold value as the low pressure rises or as the temperature on the low-pressure side rises and actuates at least one actuating element by means of which a closing force of the resetting device acting on the valve-closing member is reduced such that a passage opening is enlarged or a passage of a bypass valve arranged on the low-pressure side, which passage is arranged parallel to the passage opening, is opened.

Description

Expansion valve control method and expansion valve
Technical field
The present invention relates to a kind of expansion valve control method and expansion valve, it is specially adapted to CO 2Vehicle air conditioner as the refrigeration agent operation.
Background technique
DE10 2,004 010 997 B3 disclose a kind of expansion valve and have controlled its method, and wherein the opening and closing campaign of valve closing feature is set as the function of the pressure reduction that exists between on high-tension side inflow entrance and the exhaust port at the expansion valve of low voltage side.When refrigerating circuit was off-duty, resetting means made the valve closing feature remain on closed condition.
The diversity of having to satisfy operating conditions under best mode with this type expansion valve of the function operation of the pressure reduction between high pressure side and low voltage side.Be low to moderate average ambient temperature, for example about 40 degrees centigrade, adopting this class expansion valve to obtain rapid response characteristic and good cooling capacity.
With regard to refrigeration system, after vehicle does not move for a long time, need to obtain refrigeration fast, at the not run duration of vehicle, refrigerant pressure has risen to a high numerical value, and this high numerical value is the function of ambient temperature.Under high ambient temperature, usually need the cost long time to obtain maximum cooling capacity.
Summary of the invention
Therefore the present invention is to be based upon on the basis of following purpose: the expansion valve that improves a kind of type of controlling the method for expansion valve and formerly mentioning is realized at the lower of high ambient temperature and after not moving for a long time, provides a kind of quick cooling rapid response characteristic that makes the space of wanting cooling.
The open nature of the valve closing feature of the expansion valve that the effect that obtains according to the expansion valve control method that the present invention relates to is controlled by pressure reduction is replaced by lower cracking pressure, and consequently the response characteristic of refrigerating circuit increases.Therefore this is based on following effect, that is, by replacing the valve characteristic of corresponding lower value, make the valve closing feature open ahead of time, causes the mass flow rate of the refrigeration agent that obtains between the low pressure of the high pressure that raises very fast and milder decline to rise.When opening refrigerating circuit, compressor is opened, and in the high pressure side, has reached the authorized pressure of the maximum that approximately remains on startup period in several seconds.By increasing the mass flow rate of refrigeration agent, due to the refrigeration of the refrigerating circuit assembly that has occured in low voltage side, realize the rapid decline of low pressure under these circumstances.
According to the present invention, pass through expansion valve, it is feasible directly obtaining relatively large pressure reduction after air-conditioning system out of service starts, described expansion valve has the regulating element in low voltage side, it is by predetermined critical value, according to temperature or the pressure that low voltage side raises, reduce resetting means and act on closing force on the valve closing feature, make refrigeration agent stream flow and pass access portal.For this target, according to the first embodiment, regulating element is used for making at least one actuation element on the resetting means that acts on the valve closing feature to activate.This has improved the response characteristic of refrigerating circuit.Even obtained afterwards refrigeration at several seconds.As reduce to act on the replacement of the closing force on the valve closing feature by at least one actuation element, an embodiment is provided, the passage that is parallel to access portal is set in this embodiment, and described passage forms bypass valve, and by closing at the regulating element that low voltage side activates.When surpassing low voltage side predetermined low pressure critical value or temperature threshold value, bypass valve is opened, and makes under the high pressure or high temperature of low voltage side, when especially activating under high ambient temperature, relatively large refrigeration agent stream expands, and is even freezing in more early.
Favourable improvement according to expansion valve, be equipped with the regulating element that can be activated by low pressure, regulating element is designed to especially fill the expansion bellows of inert gas, and comprise push rod, for the closing force of the valve closing feature that reduces the closing passage opening, described push rod acts on and acts on on high-tension side resetting means.Because the heating of the parts of high ambient temperature or air-conditioning system, in expansion valve, the low pressure of refrigeration agent or evaporating pressure rise when for example, and the free length of expansion bellows is along with pressure reduces.The push rod that is arranged on the expansion bellows is outstanding to the high pressure side from low voltage side, and the setting value of regulating closing force is worked.When the running length of expansion bellows reduces, closing force, the prestressing force that especially is designed to the resetting means of spring element reduces, and makes the valve closing feature open access portal in the time early, and the mass flow of refrigeration agent flows through expansion valve.
According to an alternative improvement of the present invention, utilize the valve closing feature that the activation of the valve closing feature that occurs in low voltage side is provided, wherein resetting means is configured in low voltage side.As a result, the valve closing feature open ahead of time and the open nature of consequent expansion valve with respect to the displacement of opening time ahead of time, the function (according to low pressure) as low pressure obtains or acquisition when low pressure raises equally.
Further favourable improvement according to expansion valve of the present invention, the regulating element that can be activated along with the temperature rising of low voltage side is provided, regulating element comprises temperature transducer, described temperature transducer is arranged on low voltage side, and obtains equally the reducing of closing force of the valve closing feature in expansion valve.For example, the wax expansion element is set is used as temperature transducer, it produces for the adjusting displacement of opening the valve closing feature when temperature raises.An alternative embodiment of spring element comprises marmem, and along with the rising of temperature, marmem causes the shortening of the free length of described spring element, thereby again opens ahead of time the valve closing feature.
According to an alternative improvement of the present invention, be equipped with the resetting means that makes the valve closing feature remain on operating position in low voltage side.Act on the valve closing feature and comprise that the regulating element of temperature transducer designs in the mode identical with the high pressure reposition element.
According to an alternative improvement of the present invention, also in the outer installment of expansion valve housing the temperature transducer of regulating element.As a result, the temperature of ambient temperature or adjacent component can be used as the foundation of controlled variable.
According to further favourable improvement of the present invention, bypass valve is set, it is arranged in low voltage side and can be activated as the function (according to low pressure) of low pressure, described bypass valve has closing feature, it is arranged on membrane component or expansion bellows, and closes the parallel channels of the access portal between inflow entrance and exhaust port.Membrane component or expansion bellows preferably are full of inert gas, therefore in order to open bypass, can activate take low pressure as function.Selectively, bellows can be filled full refrigeration agent, especially carbon dioxide.In this case, filling is to design under such mode: for example lower than 15 degrees centigrade or 20 degrees centigrade, the pressure of packing material approximates greatly evaporating pressure in temperature.
An alternative improvement that is positioned at the bypass of expansion valve low voltage side is to be equipped with bypass valve, and the function (according to temperature) that bypass valve can be used as the temperature of low voltage side activates.In this case, the more multipart temperature of the temperature of the temperature of refrigeration agent or environment and air-conditioning system can be used for doing controlled variable.Control media preferably is set in bellows, and described control media produces stroke motion according to refrigerant temperature.As the replacement to bellows or expansion bellows, can adopt wax expansion element or the spring element made by marmem.
According to the further favourable improvement of the bypass valve of pressure correlation, the valve closing feature of closing passage is arranged on the high pressure side, and has closure member, spring element especially, it works facing to valve seat.As a result, when vehicle is in the state that does not move, guarantee in the closed position.
Description of drawings
With reference to the example shown in accompanying drawing, the below will describe and explain the present invention and further advantageous embodiment and improvement thereof in more detail.The feature of collecting from specification and accompanying drawing can adopt separately, and perhaps many features can adopt according to the present invention in the combination with any needs.In accompanying drawing:
Fig. 1 has showed the schematic diagram of refrigeration cycle process,
Figure shown in Figure 2 has described the pressure difference valve in the vehicle in the situation that when there is no " activating help ", the cooling curve of different operation phase under the high ambient temperature,
Fig. 3 has showed the constructed profile map of the expansion valve with the open nature displacement that occurs according to low pressure,
Fig. 4 has showed to have at the constructed profile map of low voltage side according to the expansion valve of the open nature displacement of temperature generation,
Fig. 5 has showed the constructed profile map of Fig. 3 alternate embodiments;
Fig. 6 has showed the constructed profile map of the alternate embodiments of Fig. 4,
Fig. 7 has showed the constructed profile map of the alternate embodiment of the expansion valve with the bypass valve that is parallel to pressure difference valve and controls in low voltage side,
Fig. 8 has showed the constructed profile map of the expansion valve alternate embodiment with the bypass valve that is parallel to pressure difference valve and controls temperature.
Embodiment
Fig. 1 has showed the refrigerating circuit 11 of preferred employing carbon dioxide operation.Described refrigerating circuit 11 is used for for example vehicle air conditioner.Compressor 12 is supplied to outside heat exchanger 14 on high-tension side compressed refrigerant.The latter is connected with environment facies and heat is outwards exported.What the latter's downstream connected is inner heat exchanger 15, and it is supplied to expansion valve 16 to refrigeration agent by feeding line 17.The upstream of high pressure side expansion valve 16 has incoming pressure, and described incoming pressure can be for example 120bar in summer.Flow of refrigerant is by expansion valve 16 and flow to low voltage side.At outlet side, under the condition of stable state, expansion valve 16 has the pressure between 35-45bar.The refrigeration agent cooling by earth pressure release enters inner heat exchanger 21 via discharge pipe 18, and will remove heat from environment, and such result is that for example vehicle interior obtains cooling.In heat exchanger, slip ring 22 is connected to the downstream.The refrigeration agent of vapor form flows through inner heat exchanger 15, and flows to compressor 12.In order to move described refrigerating circuit 11, pressure reduction expansion valve 16 is set, described pressure reduction expansion valve is described ground in DE102004010997B3 more detailed, and in full as a reference.The operation to expansion valve 16 based on described herein is described in more detail below Fig. 2, has wherein shown the cooling curve of vehicle under high ambient temperature.
Vehicle does not for example move under high ambient temperature for a long time, and high ambient temperature is over 40 degrees centigrade.When vehicle does not move (I), the balance pressure that usually has about 80bar in high pressure side and the low voltage side of refrigerating circuit 11.After refrigerating circuit 11 started (II-1), on high-tension side refrigerant pressure rose in several seconds immediately, due to the power of compressor, rose to maximum permissible value, for example 133bar in the high pressure side always.On the contrary, in low voltage side, pressure is slow decreasing (following curve).The start up period (II-1) further run time in, low pressure is only with little Gradient Descent.As a result, little variation only occurs in pressure, and the start up period that this making, (II-1) vehicle interior produces Slow cooling.The response characteristic of air-conditioning system is delayed.During drive pattern (II-2), stable state has appearred, and described Basic Steady is described by the horizontal component of upper and lower curve.Phase III (III) has been described the high pressure (upper curve) of expansion valve 16 upstreams under the idle mode and the low pressure (lower curve) in expansion valve 16 downstreams.
So the start up period (II-1) improved response characteristic is provided, and the start up period endurance be shortened, in order to cause the mass flow rate of relatively large refrigeration agent, pressure reduction is still relatively average simultaneously, according to the present invention, recommend to strengthen under these conditions the opening of valve.For this purpose, along with starting according to the low pressure that raises or the refrigeration agent evaporating temperature or the ambient temperature that raise, recommend to make its generation by the open nature of the expansion element controlled by pressure reduction towards lower cracking pressure displacement.As the alternative of the open nature displacement of the valve closing feature of expansion valve, to recommend bypass valve is set, described bypass valve activated in low voltage side, and opens successively according to temperature or pressure.The exemplary embodiment that the above relates to is take refrigerant vapour temperature and evaporating pressure as the basis.These actuators according to the present invention are described ground in Fig. 3-8 more detailed.
Fig. 3 has described the constructed profile map of the first expansion valve 16 of the present invention.Be provided with inflow entrance 32 in valve chest 31, it is connected to exhaust port 36 via access portal 34.Be provided with valve closing feature 37 in access portal 34.When pressure balance, described valve closing feature 37 remains on the high pressure side of the closed position of valve seat 41 by resetting means 39, and described resetting means 39 is preferably designed for spring element.At exhaust port 36, regulating element 42 is set, it comprises the one or more expansion bellowss 44 with inert gas packing 46.At one end, bellows 44 is supported on shell body wall 47.At opposite side, according to low pressure, bellows 44 activates at least one actuation element 48, especially extends to the push rod of inflow entrance 32.These push rods 48 join the prestressed displacement component 49 for reset device 39 to.In order to limit the stroke motion of regulating element 42, break 43 is set, in order to limit the end position of regulating element 42.
In case the low pressure of exhaust port 36 raises, because the pressure that rises, bellows 44 is compressed and carry out stroke motion.Simultaneously, in order to reduce the prestressing force of resetting means 39, push rod 48 has produced nondirectional stroke motion, even make valve closing feature 37 in the situation that relative little pressure reduction is opened, and refrigeration agent the start up period flow to low voltage side from the high pressure side in early days.As a result, can make expansion valve 16 obtain the displacement based on pressure of roadability.
Fig. 4 has showed the alternative embodiment of Fig. 3.The structural correspondence of expansion valve 16 is in the sort of structure shown in Figure 3.Different is that the regulating element 42 of setting and temperature correlation replaces the regulating element 42 based on low pressure or evaporating pressure with it.This and regulating element 42 temperature correlation for example comprises the spring 52 of being made by marmem.At least one actuation element 48 is arranged on regulating element 42, and acts on resetting means 39 and reduce closing force.In case the temperature of low voltage side has surpassed some desired values, shortened by the spring 52 of marmem manufacturing.As a result, the pressure that acts on resetting means 39 reduces, thereby allows access portal 34 to open.In addition, in order to activate regulating element 42, the element of wax expansion element, bimetal or other bi-materials can be as temperature transducer.Selectively, regulating element 42 also can directly act on the valve closure member.
Fig. 5 has showed the alternative embodiment of Fig. 3.This embodiment's difference is that resetting means 39 and valve closing feature 37 are arranged on low voltage side.In order to guide the valve closing feature 37 of low voltage side, maintenance and induction element 55 are set, described maintenance and induction element 55 are moving therein by pilot valve closing feature 37.In addition, maintenance and induction element 55 are accepted valve closure member 37 and the shrouded bellow 44 of low voltage side.As a result, maintenance and induction element 55 have a more than function.In addition, it is used as actuation element 48 uses, and particularly as push rod, in order to obtain the restriction to the closing force that acts on the valve closing feature 37 on access portal 34, it is connected with break 43.According to exemplary embodiment, when low pressure raises, bellows 44 is compressed and move to right.The prestressing force that this has reduced resetting means 39 makes access portal 34 open in advance.This has improved the response characteristic of refrigerating circuit 11.In addition, function is identical with embodiment in Fig. 3.
Fig. 6 has showed the alternative embodiment of Fig. 4.In this embodiment, resetting means 39 and valve closing feature 37 are arranged on low voltage side equally.Replacement as the actuation element 48 in Fig. 4 embodiment, in the identical mode of function, actuation element 48 is set, described actuation element 48 is designed to ring-type element, and as function, increase or reduce the prestressing force of the resetting means 39 on valve closing feature 37 with the change of the stroke of the spring 52 made by marmem.Described ring-type element is moving between end positions or between the break 43 of limited characteristic displacement.
Fig. 7 has described the schematic diagram of the another alternative embodiment of expansion valve 16.This embodiment has the basic structure consistent with the pressure reduction expansion valve described in DE102004010997B3.In addition, have the parallel channels parallel with access portal 34 61, described passage 61 is arranged on the regulating element 42 of low voltage side and closes, and described regulating element 42 forms bypass valve 62 together with passage 61.According to the embodiment of Fig. 7, described bypass valve 62 is activated according to evaporating pressure in low voltage side.For this purpose, for example, bellows 44 is set, fill full inert gas in described bellows 44, perhaps when applying closing force by Compress Spring, its inside is connected with environment.Have closing feature 63 at bellows 44 in the face of an end of passage 61, when corresponding to the low voltage value in the refrigeration system 11 of normal operation, during for example lower than 45bar, described closing feature 63 closing passages 61.
Fig. 8 has showed the alternative embodiment of Fig. 7.As the replacement of the bypass valve 62 that activates according to evaporating pressure, the bypass valve 62 that can activate according to temperature is set.Be provided with control media 66 in regulating element 62, described regulating element 62 is designed to bellows, and the function that is variable by the temperature change of bearing volume.Closing feature 63 passively activated components 48 activate, and described actuation element 48 is for example the form of push rod, and it is arranged on bellows, preferably is arranged on the high pressure side of passage 61, is maintained in its closed position via closing feature 68--especially spring element.
The packing that is encapsulated in bellows interior has such pressure and temperature characteristic: along with the temperature of the carbon dioxide coolant of low voltage side rises, and the outside rising De Genggao of bellows interior pressure ratio bellows.As a result, the temperature rising along with low voltage side can realize the bypass opening.
For the present invention, each is absolutely necessary above-described all features, and can carry out each other as required combination.

Claims (10)

1. expansion valve control method, described expansion valve has: valve chest (31), it has inflow entrance (32) and exhaust port (36), valve closing feature (37), it closes the valve seat (41) that is arranged on the access portal (34) between inflow entrance (32) and exhaust port (36), and resetting means (39), it works on the closing direction of valve closing feature (37), it is characterized in that, the regulating element that is assigned to valve closing feature (37) (42) in low voltage side, low pressure rising or temperature rising along with low voltage side, be activated by predetermined critical value, and activate at least one actuation element (48), thus, the closing force that resetting means (39) acts on valve closing feature (37) reduces, make access portal (34) enlarge, described regulating element (42) is activated according to low pressure or the temperature of low voltage side, therefore the open nature by the valve closing feature controlled by pressure reduction is towards lower opening pressure difference displacement.
2. method according to claim 1 is characterized in that: the method is used for CO 2Vehicle air conditioner as the refrigeration agent operation.
3. expansion valve, have: valve chest (31), described valve chest (31) have inflow entrance (32) and exhaust port (36); Valve closing feature (37), it closes the valve seat (41) that is arranged on the access portal (34) between inflow entrance (32) and exhaust port (36); Resetting means (39), it works on the closing direction of valve closing feature (37), it is characterized in that, regulating element (42) is arranged on low voltage side, described regulating element (42) is assigned to valve closing feature (37) and is connected with at least one actuation element (48), described actuation element (48) acts on the resetting means (39) that is arranged on valve closing feature (37), to reduce the closing force of valve closing feature (37).
4. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates by low pressure is designed to membrane component or expansion bellows (44), and the push rod (48) that acts on high-tension side resetting means (39) is activated, with the closing force of the valve closing feature (37) that reduces closing passage opening (34).
5. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates by low pressure is designed to membrane component or expansion bellows (44), and the push rod (48) of the resetting means (39) that acts on low voltage side is activated, with the closing force of the valve closing feature (37) that reduces closing passage opening (34).
6. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates by low pressure comprises inert gas packing (46).
7. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates along with the rising of low voltage side temperature comprises temperature transducer, described regulating element reduces to act in low voltage side the closing force of valve closing feature (37), perhaps with opening direction that resetting means (39) parallels on the resilient force that works in valve closing feature (37), described valve closing feature (37) is maintained in its closed position by on high-tension side resetting means (39).
8. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates along with the rising of low voltage side temperature comprises temperature transducer, described regulating element reduces to act in low voltage side the closing force of valve closing feature (37), perhaps with opening direction that resetting means (39) parallels on the resilient force that works in valve closing feature (37), described valve closing feature (37) is maintained in its closed position by the resetting means (39) of low voltage side.
9. expansion valve according to claim 3, it is characterized in that: the regulating element (42) that activates along with the low voltage side temperature is the form of marmem or wax expansion element.
10. according to claim 7 or 8 described expansion valves is characterized in that: it is outside and comprise the temperature of ambient temperature or vehicle component that temperature transducer is arranged on housing (31).
CN2007101282842A 2006-05-05 2007-05-08 Expansion valve control method, and expansion valve Expired - Fee Related CN101135387B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021327.0 2006-05-05
DE102006021327A DE102006021327A1 (en) 2006-05-05 2006-05-05 Control method for expansion valves in car air conditioning systems uses bellows filled with inert gas which pushes rods against spring attached to the valve stem so as to open valve when threshold pressure or temperature is exceeded

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CN101135387A CN101135387A (en) 2008-03-05
CN101135387B true CN101135387B (en) 2013-06-05

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US (1) US20070295016A1 (en)
JP (1) JP5259980B2 (en)
CN (1) CN101135387B (en)
DE (1) DE102006021327A1 (en)
FR (1) FR2900716A1 (en)
IT (1) ITSV20070018A1 (en)

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US20070295016A1 (en) 2007-12-27
CN101135387A (en) 2008-03-05
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JP2007298271A (en) 2007-11-15
JP5259980B2 (en) 2013-08-07
ITSV20070018A1 (en) 2007-11-06

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