CN1223717A - Improvement in the refrigerating circuits of household and similar vapour-compression refrigeration apparatuses - Google Patents
Improvement in the refrigerating circuits of household and similar vapour-compression refrigeration apparatuses Download PDFInfo
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- CN1223717A CN1223717A CN 97195897 CN97195897A CN1223717A CN 1223717 A CN1223717 A CN 1223717A CN 97195897 CN97195897 CN 97195897 CN 97195897 A CN97195897 A CN 97195897A CN 1223717 A CN1223717 A CN 1223717A
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Abstract
The invention provides for the use, in the refrigerating circuit of a household or similar vapour-compression refrigeration apparatus, of the same control means (7) used for the driving motor of the compressor (1), which is a brushless-type motor, to also control electromagnetic valve means (8) located upstream of the capillary tube (4), said valve means being adapted to interrupt the flow of the refrigerant medium migrating from the condenser (2) to the evaporator (5) during the pauses in the operation of the compressor (1), wherein said control means (7) control a single electric parameter, such as preferably the power-supply frequency. In a preferred embodiment, the valve means (8) comprise at least a bistable valve.
Description
The present invention relates to improved family expenses and the similarly refrigerating circuit of steam compression type refrigerating apparatus (refrigerator, household freezer and analog), such refrigeration plant comprises a fully closed compressor and electromagnetic valve device, this fully closed compressor is by the electronic control type Motor Drive of a brushless, and electromagnetic valve device is suitable for cutting off flowing of refrigerant medium in the upstream of expansion gear.
A well-known shortcoming of each refrigerating circuit of mentioned kind be since when compressor operation by the interval that temperature controller determined of electrical equipment, the part of refrigerant medium is transferred to evaporimeter (the coldest part) by capillary from condenser (that is the hottest part in hot fluid dynamics loop), and this capillary has formed the expansion gear of refrigerant medium.Therefore, when compressor was reset after this time-out, the refrigerant medium of gaseous state existed in described porch capillaceous.As a result, after compressor started again, refrigerating capacity reduced certain hour sharp.In other words, the motor of drive compression machine utilizes electric energy to produce a refrigerating capacity that reduces.
In order to prevent that refrigerant medium from shifting in the above described manner, and, before many years, just proposed suitable valve gear is added in the refrigerating circuit for fear of the energy that is used between the part of the loop " downstream " of the loop " upstream " of compressor part and compressor, producing required pressure reduction in the consumption of described compressor interval.Can guarantee that also liquid refrigerant medium is in the constant existence in porch capillaceous.
For example, constant voltage that is the pressure sensitive valve gear be known, this valve gear is when directly being added in the refrigerating circuit, the compressor interval of determining at thermostatic type advantageously cuts off flowing of refrigerant medium in the capillary, then, this valve gear can recover described flow (seeing patent documentation US-A-4267702) automatically when identical compressor starts again.Yet, these constant-voltage equipments are mechanical and need structural modification owing to them, especially connect with welding or the mechanical connection form, these connections all constitute many potential cold-producing mediums in all cases and sew the source, so they are to the decline generation appreciable impact of refrigerating circuit overall reliability.
The valve gear of also known other generations and above-mentioned valve gear effect same, they are connected with each temperature sensor (seeing patent documentation US-A-4286438) in operation.These other devices do not require refrigerating circuit are changed; Yet, the inevitably starting of the motor of general opening and closing that hinder described valve gear of thermal inertia and the practical difficulty when differentiating a securing position and drive compression machine and stop correctly and reliably synchronous, in this securing position, sensor is set, normally be arranged on the condenser coil of refrigerating circuit, that is be arranged on the outside of electric refrigerator.
About having above-mentioned valve gear and another shortcoming that refrigerating circuit produced by the household electrical appliance of induction conductivity compressor driven is, because the existence of above-mentioned valve gear, this compressor can not be reset with unbalanced pressure in the loop basically, above-mentioned induction conductivity neither is equipped with an Electronic starting capacitor, also " does not amplify ".Therefore, advise, promptly except above-mentioned valve gear, also using one " control valve " in the housing of fully closed compressor is the needs that check-valves (seeing patent documentation WO94/18512) has in fact avoided use is had the motor of high starting torque, but does not in fact obtain the remarkable improvement aspect the overall efficiency of system by this way.In addition, this solution makes it increase new mutation to various compressor model scopes, because in fact not every refrigerating circuit all requires to use above-mentioned valve gear.Concerning manufacturer, this means the certain increase at producing cost and administrative expenses certainly.
In order to eliminate these shortcomings, therefore the present invention has following purpose:
Transfer to evaporimeter in order reliably and fully to prevent refrigerant medium interval when the operation of compressor from condenser;
To amplify any needs of (stack of laminations and/or copper winding) and make the expense of bearing by manufacturer reduce to minimum (so that avoiding) being used for the motor of drive compression machine in order to eliminate to buying tangible, undesirable increase on the final user price that this device pays;
For the danger that the overall reliability that influences refrigerating circuit is reduced minimizes; And especially,
In order to cut down the consumption of energy.
In a kind of refrigerating circuit with characteristics described in claims and feature, these purposes have been reached.
Especially, have been found that, in refrigerating circuit, use a kind of fully closed compressor that drives by the electric-controlled type brushless motor of the sort of type described in European patent EP-A-0490089 that same applicant proposed, in addition, it is very favourable utilizing the electronic system of same Motor Control to control a valve, and this valve is to be added in the refrigerating circuit in a position of capillary upstream.In fact, this compressor driving motor, further improve the overall efficiency (COP) of refrigerating circuit, the reduction energy uses, and reduction noise level, this compression function is reset and is not had any problem, and to making the electricity consumption start capapcitor without any needs, though resemble when existing this unbalanced pressure that produces to exist owing to valve gear also like this.
In any case, will be easier and be expressly understood that the present invention, the preferred embodiment provide with reference to accompanying drawing by unrestriced example below from the explanation of a preferred embodiment, wherein:
Fig. 1 is the calcspar according to refrigerating circuit of the present invention;
Fig. 2 refrigerant medium that is compressor during the operation certain hour is in the schematic diagram of the pressure evaluation figure of the suction side of this compressor and outlet side.
As shown in Figure 1, a kind of refrigerating circuit that is used for family expenses or similar refrigeration plant comprises: a fully closed compressor 1, and the housing of this compressor also seals drive motor; A condenser 2; A device for drying and filtering 3; One is used for the refrigerant medium capillary 4 of isenthalpic expansion basically; With an evaporimeter 5.
As what previously pointed out in this manual, compressor 1 is by the sort of type of same applicant described in the aforementioned patent EP-A-0490089, that is the sort of type that is driven by a kind of brushless motors that connect with frequency control apparatus 7.Described frequency control apparatus belongs to this type, promptly guarantee under any load condition, motor can both move under the rotating speed of performance the best that makes compressor of controlling automatically, described rotating speed all is lower than a kind of rated speed of equal traditional type induction conductivity in all cases, and this rated speed is by the frequency decision of power-supply system.Connection between compressor 1 and the described frequency control apparatus 7 especially forms by traditional electric wire 6 in any suitable manner.
Between condenser 2 and capillary 4, preferably between the intake section of the exit portion of condenser 2 and device for drying and filtering 3 in the included refrigerating circuit part, the bistable state check valve 8 of any known type is installed, as at the valve described in the patent documentation IT-A-1203572.Yet the valve of any other type can use, as long as this valve such as this type, promptly only it just absorbs power when the switching time from the closed position to the open position, and reverse situation also is like this, in order to avoid unnecessarily use energy.
According to main feature of the present invention, 7 interconnection of the operation of bistable valve 8 and same frequency control apparatus, this frequency control apparatus 7 in fact also with the operation interconnection of the motor of drive compression machine 1.Even under situation about connecting between valve 8 and the described frequency control apparatus 7, this also can especially form by common electric wire 9 in any suitable manner.
And it is correctly to use single assembly 7 to control simple function parameter that is frequency, guaranteeing according to valve 8 of the present invention, that is guarantee accurate synchronization between the starting of drive motor of moment of opening and closing of valve 8 and compressor 1 and the dwelling period according to desirable logic operation.
As a kind of confirmation with its gained result, Fig. 2 is illustrated in a kind of useful life that provides according to the domestic refrigerating appts of refrigerating circuit of the present invention, whenever with experiment obtain directly at the pressue-graph of " downstream " of compressor 1 (downwards) and " upstream " (making progress).For more for simplicity, the time of being considered includes only two cycles of operation (in 1A and the expression of 2A place) and an intermediate suspension cycle (in the expression of 1B place) of compressor in this case.The moment (zero point Fig. 2 curve map) beginning from compressor start, " downstream " pressure rises to a high value Pe from an initial low value Pe ' "; and during whole most of cycle of operation 1A, be stabilized in this high value place; when compressor was opened circuit (because the temperature controller of equipment trips in a well-known manner) also out of service, this cycle of operation 1A stopped at moment T1 place.During with one-period 1A, " upstream " pressure promptly drops to a low value Pi slightly from a high initial value Pi ' ", and remain unchanged basically until last moment T1.From described moment T1, and during the pause period 1B of whole compressor (ending is that same compressor is reset at moment T2 place), " downstream " pressure drops to an end value Pe from initial value Pe ' " ', and " upstream " pressure from initial value Pi " rise to end value Pi " '.In compressor operating cycle 2A subsequently (this cycle of operation 2A stops in the beginning of moment T2 place and at moment T3 place), " downstream " pressure is again from low value Pe ' " rise to high value Pe ", and " upstream " pressure is again from high value Pi " ' basically be low value Pi to dropping to ".
This clearly illustrates, during the pause period 1B of compressor, in fact refrigerant medium remarkable transfer of 5 from condenser 2 to evaporimeter does not take place.In fact, at zero point in the moment and T2 place, (or resetting) is simultaneous is with compressor 1 starting, and control device 7 is handled bistable valves 8 and is converted to and opens configuration, and at moment T1 and T3 place, and same device is handled same valve and is converted to and closes configuration.Therefore, the remarkable pressure reduction (Pe ' " Pi " ') between " upstream " of compressor 1 part and " downstream " part even also maintenance existence when pause period finishes, as this in Fig. 2, also can see.Be this fact with the major advantage of the brushless motor of one type that also uses among the present invention frequency control apparatus interconnection, be it in the presence of the state of these unbalanced pressures also the most correct and easily the starting, and do not need to use in addition a starting capacitance device, although this is with opposite with the situation of traditional induction conductivity.
As what in this explanation, previously pointed out, when the equipment operation that is equipped with above-mentioned refrigerating circuit, can obtain aspect the obvious energy-saving effect, that is make described equipment can significantly reduce that the present invention also is effective aspect their the energy use.As its a kind of proof, following tabular has gone out the applicant the vertical household freezer of same dwelling house type that is equipped with a refrigerating circuit has been compared the result of test, and the above-mentioned refrigerating circuit that compares test comprises respectively:
(a) one the rated power of this induction conductivity is 72 watts by traditional type induction conductivity compressor driven, and equip a start capapcitor, this capacitor rated capacity is 45 microfarads;
(b) one by the electric motor driven compressor of a brushless formula, this brushless formula motor has the rated power identical substantially with above-mentioned induction conductivity, it as by same applicant above interconnect with a frequency control apparatus under the condition described in European patent EP-A-0490089 of mentioning repeatedly;
(c) except as top (b) described compressor, bistable state check valve is arranged in as shown in Figure 1 the loop and interconnects according to the same frequency control apparatus of the motor of teaching of the present invention and drive compression machine.
To have clean useful volume be the refrigerating circuit that 230 liters and are filled same amount (80g) refrigerant R600 to used fast freezing case in above-mentioned test run, is used for keeping a temperature that evenly equates at device interior.
Result of the test
| ????(a) | ????(b) | ????(c) | |
| The running time of compressor (%) | ????47.5 | ????42.0 | ????35.6 |
| Every day used gross energy, (kilowatt hour/24 hour) | ????1.11 | ????0.86 | ????0.75 |
| Relative energy consumption | ????100 | ????77.4 | ????67.6 |
Even when comparing, also can know and understand some advantages that the present invention (situation (c)) is provided all sidedly with the getable intrinsic obvious result of technical scheme (situation (b)) that discloses in the front patent specification that proposes by same applicant.We think, for the starting of the opening and closing cycle that obtains valve and air compressor motor and dwelling period correct synchronously, utilize same frequency control apparatus, the remarkable increase of any cost and therefore and the selling price that influence is equipped with according to the domestic refrigerating appts of refrigerating circuit of the present invention reaches any noticeable degree needn't be born by manufacturer, just obtains above-mentioned advantage.
Shinny the present invention has illustrated the example of a relevant one preferred embodiment, but those skilled in the art can develop other mutation and embodiment from teaching of the present invention fully, as utilize the electrical parameter of a difference in functionality, by a same device control the motor of drive compression machine and electromagnetic valve device the two, because concerning the latter, can form by the device different with above-mentioned bistable state check valve, as this previously said in this manual.Therefore obviously, any other such embodiment mutation all will be considered to not depart from the scope of the present invention.
Claims (3)
1. be used for the hot fluid dynamics loop of family expenses and similar refrigeration plant, it comprises: one by a brushless formula, the electric motor driven compressor of electric control (1); At least one evaporimeter (5); A condenser (2); A capillary (4) or similar expansion gear; And electromagnetic valve device (8), this electromagnetic valve device (8) is arranged on the upstream of capillary (4) and is suitable for and can closes at the operation interval of compressor (1), it is characterized in that: the two all connects the drive motor of compressor (1) and described valve gear (8) with same control device (7), so that according to desirable disjunctive form formula, the starting and the dwelling period of the opening and closing cycle of valve gear (8) and compressor (1) are synchronous.
2. the refrigerating circuit of family expenses as claimed in claim 1 and similar devices, it is characterized in that: described same control device (7) is a kind of frequency control apparatus of known kind own, so that the drive motor of compressor (1) is with different with supply main or supply frequency at least frequency power supplies, this drive motor can be with a kind of speed operation that compressor performance is optimized.
3. the refrigerating circuit of family expenses as claimed in claim 1 and similar devices, it is held to levy and is: described valve gear (8) comprises at least one bistable state check valve, when being in its first configuration, opens by this bistable state check valve, and when being in its second configuration, keep in essence closing, its first configuration is corresponding to the cycle of operation (1A, the 2A of the drive motor of compressor (1) ...), and its second configuration is corresponding to the operating time-out of the motor (1B of described compressor (1) ...).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97195897 CN1223717A (en) | 1996-07-16 | 1997-06-24 | Improvement in the refrigerating circuits of household and similar vapour-compression refrigeration apparatuses |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPN96A000044 | 1996-07-16 | ||
| CN 97195897 CN1223717A (en) | 1996-07-16 | 1997-06-24 | Improvement in the refrigerating circuits of household and similar vapour-compression refrigeration apparatuses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1223717A true CN1223717A (en) | 1999-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97195897 Pending CN1223717A (en) | 1996-07-16 | 1997-06-24 | Improvement in the refrigerating circuits of household and similar vapour-compression refrigeration apparatuses |
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| Country | Link |
|---|---|
| CN (1) | CN1223717A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563938A (en) * | 2010-12-24 | 2012-07-11 | 海尔集团公司 | Mechanical type frequency conversion refrigerator and refrigerating circuit for mechanical type refrigerator |
-
1997
- 1997-06-24 CN CN 97195897 patent/CN1223717A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563938A (en) * | 2010-12-24 | 2012-07-11 | 海尔集团公司 | Mechanical type frequency conversion refrigerator and refrigerating circuit for mechanical type refrigerator |
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