CN114076419A - Refrigeration appliance, refrigeration system and control method thereof - Google Patents

Refrigeration appliance, refrigeration system and control method thereof Download PDF

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Publication number
CN114076419A
CN114076419A CN202010776114.0A CN202010776114A CN114076419A CN 114076419 A CN114076419 A CN 114076419A CN 202010776114 A CN202010776114 A CN 202010776114A CN 114076419 A CN114076419 A CN 114076419A
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China
Prior art keywords
capillary
path
opening
evaporator
capillary tube
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Granted
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CN202010776114.0A
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Chinese (zh)
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CN114076419B (en
Inventor
杨鹏
陈建全
张奎
刘建如
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Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
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Priority to CN202010776114.0A priority Critical patent/CN114076419B/en
Publication of CN114076419A publication Critical patent/CN114076419A/en
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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
    • F25B1/00—Compression machines, plants or systems with non-reversible 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B2500/12—Sound
    • 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
    • F25B2500/13—Vibrations
    • 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
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a refrigeration appliance, a refrigeration system and a control method thereof. The refrigeration system comprises a compressor, a condenser, an evaporator and a capillary mechanism, wherein the capillary mechanism comprises a first capillary tube and a second capillary tube which are arranged in parallel, the first capillary tube is attached to the air return pipe, and the second capillary tube is attached to the evaporator; the opening and closing mechanism is matched and connected with the capillary mechanism and has at least two double-path conduction states; when any two-way conduction state is realized, the opening and closing mechanism conducts a first path from the condenser to the evaporator through the first capillary tube and a second path from the condenser to the evaporator through the second capillary tube; in any two of the two-way conduction states, the opening and closing mechanism enables the distribution ratio of the refrigerant flowing through the second capillary tube to the refrigerant flowing through the capillary mechanism to be different, and balance and control between vibration reduction and noise reduction and high refrigeration efficiency can be achieved.

Description

Refrigeration appliance, refrigeration system and control method thereof
Technical Field
The invention relates to a refrigerating system, a control method thereof and a refrigerating appliance with the refrigerating system, and belongs to the technical field of household appliances.
Background
Refrigerators and freezers are indispensable refrigeration appliances in modern life. Most of the basic principles of the conventional refrigerators and freezers for achieving the purpose of refrigeration are based on vapor compression refrigeration technology. For cost and operational stability considerations, capillary tubes are often employed as a throttling mechanism between the condenser and evaporator of this type of technology.
The capillary tube is used for throttling and depressurizing high-pressure medium-temperature liquid-phase refrigerant into low-pressure low-temperature refrigerant. Specifically, a high-pressure medium-temperature liquid-phase refrigerant enters a capillary tube, the resistance of the refrigerant is gradually increased under the action of friction force on the wall surface of the capillary tube, the pressure and the temperature of the refrigerant are gradually reduced, and finally, a two-phase refrigerant state under evaporation pressure is achieved at the outlet of the capillary tube, and then the refrigerant enters an evaporator at a high speed.
However, at the joint of the capillary tube and the evaporator, due to the influence of sudden pressure change caused by the sudden sharp increase of the inner diameter of the pipeline, the refrigerant is easy to change phase after being sprayed out from the capillary tube at high speed to generate a large number of bubbles, and the bubbles are increased until being cracked along with the continuous reduction of the pressure, so that the spraying noise similar to a horn-shaped horn is generated, in addition, the severe impact of the refrigerant in the spraying process can drive the refrigerating pipeline to vibrate, and the vibration is transmitted to a refrigerating appliance box body along the pipeline to generate vibration noise.
Such noise may increase the overall noise of the refrigeration appliance, and may cause a poor user experience.
Disclosure of Invention
The invention provides a refrigerating system, a control method thereof and a refrigerating appliance with the refrigerating system, aiming at solving the problem of noise caused by eruption at the outlet of a capillary tube in the prior art.
To achieve the above object, an embodiment of the present invention provides a refrigeration system including:
a compressor;
a condenser, the inlet end of which is connected to the exhaust pipe of the compressor;
the outlet end of the evaporator is connected with the air return pipe of the compressor;
a capillary mechanism in communication between the outlet end of the condenser and the inlet end of the evaporator, the capillary mechanism comprising a first capillary tube and a second capillary tube arranged in parallel, the first capillary tube attached to the muffler and the second capillary tube attached to the evaporator;
the opening and closing mechanism is matched and connected with the capillary mechanism and has at least two double-path conduction states;
when any two-way conduction state is realized, the opening and closing mechanism conducts a first path from the condenser to the evaporator through the first capillary tube and a second path from the condenser to the evaporator through the second capillary tube;
in any two of the two-way conduction states, the opening/closing mechanism causes the refrigerant flowing through the second capillary tube to have a different distribution ratio of the refrigerant flowing through the capillary mechanism.
As a further improvement of an embodiment of the present invention, the refrigeration system further includes:
a sensor configured to sense a condition signal of a diameter expansion position between the capillary mechanism and the evaporator, the condition signal being a vibration amplitude or a noise value;
and the controller is connected with the sensor and the opening and closing mechanism and is configured to control the state change of the opening and closing mechanism according to the condition signal.
As a further improvement of an embodiment of the present invention, the opening/closing mechanism has an opening degree that is positively correlated with the dispensing ratio;
when the switching mechanism is in the current two-way conduction state and the condition signal meets a preset condition, the controller controls the opening degree of the switching mechanism to increase by a preset amplification degree; otherwise, the controller controls the switching mechanism to continuously keep the current two-way conduction state;
the preset condition is that the preset vibration amplitude is larger than a preset vibration amplitude or larger than a preset noise value.
As a further improvement of an embodiment of the present invention, the opening/closing mechanism has a plurality of the two-way conduction states in which the opening degree thereof is increased in increments with the preset increase as a tolerance.
As a further improvement of an embodiment of the present invention, the opening and closing mechanism further has a first one-way conduction state corresponding to an opening degree of zero and a second one-way conduction state corresponding to an opening degree of 100%;
when the first single-path conduction state is realized, the switching mechanism conducts the first path and cuts off the second path;
and when the second single-path conduction state is realized, the switching mechanism cuts off the first path and conducts the second path.
As a further improvement of an embodiment of the present invention, when the opening and closing mechanism is in the current state for a predetermined duration, the sensor senses the current status signal of the diameter-enlarged position, and if the status signal meets a predetermined condition and the opening and closing mechanism is not in the second one-way conduction state, the controller controls the opening of the opening and closing mechanism to increase the predetermined increase.
As a further improvement of an embodiment of the present invention, the inlet end of the evaporator is provided with a transition pipe having an inner diameter larger than that of the capillary mechanism, the transition pipe communicates the capillary mechanism and the evaporator and defines the diameter-expanded position, and the sensor is mounted to the transition pipe.
As a further improvement of an embodiment of the present invention, the capillary mechanism includes a confluent capillary, and the first capillary and the second capillary are both communicated to the evaporator via the confluent capillary and the transition pipe in this order;
the opening and closing mechanism comprises a flow-merging valve, and the flow-merging valve is arranged between the flow-merging capillary and the first capillary and between the flow-merging capillary and the second capillary;
when the two-way conduction state is realized, the flow merging valve conducts a path from the first capillary to the flow merging capillary and conducts a path from the second capillary to the flow merging capillary;
in the first one-way conduction state, the confluence valve conducts a path from the first capillary to the confluence capillary and cuts off a path from the second capillary to the confluence capillary;
in the second one-way conduction state, the confluence valve cuts off a path from the first capillary to the confluence capillary and conducts a path from the second capillary to the confluence capillary.
As a further improvement of an embodiment of the present invention, the capillary mechanism includes a diversion capillary and a diversion valve, and the condenser is respectively communicated to the first capillary and the second capillary through the diversion capillary;
the opening and closing mechanism comprises a flow dividing valve, and the flow dividing valve is arranged between the flow dividing capillary and the first capillary and between the flow dividing capillary and the second capillary;
when the two-way conduction state is realized, the flow dividing valve conducts a path from the flow dividing capillary tube to the first capillary tube and conducts a path from the flow dividing capillary tube to the second capillary tube;
when the first single-way conduction state is realized, the path from the diversion capillary to the first capillary is conducted by the diversion valve, and the path from the diversion capillary to the second capillary is cut off;
and when the second single-way conduction state is realized, the shunt valve cuts off the path from the shunt capillary to the first capillary and conducts the path from the shunt capillary to the second capillary.
As a further improvement of an embodiment of the present invention, the first capillary tube is attached to the muffler in at least one of a manner of being wound outside the muffler, being arranged side by side outside the muffler, being penetrated inside the muffler; and/or the like, and/or,
the second capillary tube is attached to the evaporator in at least one of a manner of winding outside the evaporator, side by side outside the evaporator, and penetrating inside the evaporator.
To achieve the above object, an embodiment of the present invention provides a refrigeration system including:
a compressor;
a condenser, the inlet end of which is connected to the exhaust pipe of the compressor;
the outlet end of the evaporator is connected with the air return pipe of the compressor;
the capillary mechanism is communicated between the outlet end of the condenser and the inlet end of the evaporator, and is characterized by comprising a first capillary tube and a second capillary tube which are arranged in parallel, wherein the lowest ambient temperature of the first capillary tube is higher than that of the second capillary tube;
the opening and closing mechanism is matched and connected with the capillary mechanism and has at least two double-path conduction states;
when any two-way conduction state is realized, the opening and closing mechanism conducts a first path from the condenser to the evaporator through the first capillary tube and a second path from the condenser to the evaporator through the second capillary tube;
in any two of the two-way conduction states, the opening/closing mechanism causes the refrigerant flowing through the second capillary tube to have a different distribution ratio of the refrigerant flowing through the capillary mechanism.
In order to achieve the above object, an embodiment of the present invention provides a refrigeration appliance including the refrigeration system.
In order to achieve the above object, an embodiment of the present invention provides a control method of a refrigeration system, where the refrigeration system includes a compressor, a condenser, a capillary mechanism, and an evaporator, which are sequentially connected in series, and the capillary mechanism includes a first capillary tube and a second capillary tube arranged in parallel; the condenser forms a first path from the first capillary tube to the evaporator, and refrigerant exchanges heat with a return air pipe of the compressor when flowing through the first capillary tube; the condenser forms a second path from the condenser to the evaporator through the second capillary tube, and refrigerant exchanges heat with the evaporator when flowing through the second capillary tube; the control method comprises the following steps:
controlling an opening and closing mechanism to simultaneously conduct the first path and the second path;
sensing a condition signal of an expanding position between the capillary mechanism and the evaporator, wherein the condition signal is a vibration amplitude or a noise value;
judging whether the condition signal meets a preset condition, wherein the preset condition is that the vibration amplitude is larger than a preset vibration amplitude or larger than a preset noise value;
if so, increasing the opening degree of the opening and closing mechanism to increase the distribution ratio of the refrigerant of the second path in the refrigerant of the capillary mechanism;
if the opening and closing mechanism still conducts the first path and the second path at the same time, returning to the step of sensing a condition signal of an expanding position between the capillary mechanism and the evaporator to perform next circulation; wherein the "return" action is performed at least once in the control method.
As a further improvement of an embodiment of the present invention, the control method further includes:
if the opening and closing mechanism conducts the second path and cuts off the second path at this time, the cycle is terminated.
As a further improvement of the embodiment of the present invention, before the step of "controlling the opening/closing mechanism to conduct the first path and the second path":
controlling the compressor to start, and simultaneously controlling the switching mechanism to conduct the first path and cut off the second path;
sensing the condition signal of the diameter expansion position between the capillary mechanism and the evaporator, and judging whether the condition signal meets the preset condition;
if yes, the opening degree of the opening and closing mechanism is increased so as to enter the step of controlling the opening and closing mechanism to conduct the first path and the second path.
As a further improvement of an embodiment of the present invention, each of the steps of "sensing a condition signal of a diameter expansion position between the capillary mechanism and the evaporator" is:
and sensing a current condition signal of a diameter expansion position between the capillary mechanism and the evaporator when the opening and closing mechanism keeps the current state to reach a preset time length.
As a further improvement of an embodiment of the present invention, in the control method, an increase in the opening degree of the opening and closing mechanism is constant at any time.
Compared with the prior art, the invention has the beneficial effects that: on one hand, the supercooling degree of the outlet end of the capillary mechanism can be increased through the heat exchange of the refrigerant with the air return pipe and the evaporator in the capillary mechanism, the gas phase proportion of the refrigerant at the diameter expansion position between the evaporator and the capillary mechanism is reduced, the refrigerant flows into the evaporator with smaller dryness, and the noise and vibration emitted at the diameter expansion position are reduced; on the other hand, by setting at least two double-path conduction states corresponding to different distribution ratios, the proportion of the refrigerant flowing through the first capillary tube and the refrigerant flowing through the second capillary tube can be adjusted, so that the balance and control between vibration reduction and noise reduction and high refrigeration efficiency are realized, and the performance of the refrigeration system is optimized to adapt to the use requirements under different conditions.
Drawings
Fig. 1 is a schematic configuration diagram of a refrigeration system according to a first embodiment of the present invention;
FIG. 2 is a logic flow diagram of a method of controlling a refrigeration system in accordance with a first embodiment of the present invention;
fig. 3 is a partial structural schematic view of a refrigeration system according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Referring to fig. 1-2, a refrigeration system 100, and a method of controlling the refrigeration system, according to a first embodiment of the present invention is illustrated.
Referring to fig. 1, a refrigeration system 100 includes a compressor 10, a condenser 20, a capillary mechanism, an evaporator 40, and an opening and closing mechanism.
The compressor 10, the condenser 20, the capillary mechanism and the evaporator 40 are connected in series in sequence to form a closed loop for the refrigerant of the refrigeration system 100 to circularly flow along the compressor 10, the condenser 20, the capillary mechanism and the evaporator 40 and then return to the compressor 10. Specifically, the outlet end of the compressor 10 is provided as a discharge pipe 12, and the discharge pipe 12 is connected to the inlet end 21 of the condenser 20; the inlet end of the compressor 10 is provided with an air return pipe 11, and the air return pipe 11 is connected with the outlet end 42 of the evaporator 40; the capillary mechanism communicates between the outlet end 22 of the condenser 20 and the inlet end of the evaporator 40.
The cycle of the refrigerant in the refrigeration system 100 is generally: high-temperature high-pressure superheated refrigerant gas at the outlet end of the compressor 10 enters the condenser 20 through the exhaust pipe 12, is condensed into high-pressure saturated or supercooled liquid, and then enters the capillary mechanism for throttling and pressure reduction; then the refrigerant gas is injected into the evaporator 40 to be vaporized into low-temperature and low-pressure refrigerant gas; finally, the refrigerant returns to the compressor 10 through the return pipe 11, is compressed again into high-temperature high-pressure superheated refrigerant gas by the compressor 10, and is discharged, thereby completing the whole cycle process.
The capillary mechanism includes a first capillary 31 and a second capillary 32 arranged in parallel. The condenser 20 forms a first path P1 through the first capillary tube 31 to the evaporator 40, and the condenser 20 forms a second path P2 through the second capillary tube 32 to the evaporator 40.
The first capillary tube 31 is attached to the muffler 11 so that the refrigerant can exchange heat with the muffler 11 while flowing through the first capillary tube 31. Based on this, the attachment of the first capillary tube 31 to the muffler 11 has various implementations, for example: as in the embodiment shown in fig. 1, the first capillary tube 31 is attached to the muffler 11 in a side-by-side manner outside the muffler 11, wherein the refrigerant flow directions are the same or opposite, and the first capillary tube 31 and the muffler 11 are in abutting contact or slightly separated from each other; in an alternative embodiment, the first capillary tube 31 is attached to the muffler 11 in a manner of winding around the outside of the muffler 11, and likewise, the first capillary tube 31 and the muffler 11 may be in contact with each other or slightly separated from each other; in a further modified embodiment, the first capillary tube 31 is attached to the muffler 11 in a manner of penetrating through the muffler 11, and specifically, the first capillary tube 31 may be penetrated through a tube wall of the muffler 11, or may be penetrated through an inner tube of the muffler 11. Of course, based on the purpose of "heat exchange between the refrigerant and the muffler 11 when the refrigerant flows through the first capillary tube 31" in the present invention, the first capillary tube 31 and the muffler 11 are attached by other fitting methods than the above-described example.
The second capillary tube 32 is attached to the evaporator 40 so that the refrigerant can exchange heat with the evaporator 40 while flowing through the second capillary tube 32. Similarly, the attachment of the second capillary tube 32 to the evaporator 40 has various implementations based on this, for example: as in the embodiment shown in fig. 1, the second capillary tube 32 is attached to the evaporator 40 in a manner of winding around the outside of the evaporator 40, and the second capillary tube 32 and the evaporator 40 may be in abutting contact with each other or slightly separated from each other; in an alternative embodiment, second capillary tube 32 is attached to evaporator 40 in a side-by-side relationship with the exterior of evaporator 40, wherein the refrigerant flow direction may be the same or opposite, or second capillary tube 32 and evaporator 40 may be in abutting contact or slightly separated from each other; in a further modified embodiment, the second capillary tube 32 is attached to the evaporator 40 in a manner of penetrating inside the evaporator 40, and specifically, the second capillary tube 32 may be penetrated in a tube wall of the evaporator 40, or may be penetrated in an inner tube of the evaporator 40. Of course, the person skilled in the art will be able to make the attachment of the second capillary tube 32 to the evaporator 40 in a manner other than the above-mentioned examples, based on the idea of the invention that the refrigerant can exchange heat with the evaporator 40 when flowing through the second capillary tube 32.
The opening and closing mechanism is connected with the capillary mechanism in a matching mode and has at least two double-path conduction states. When any one of the two paths is in a two-way conduction state, the switching mechanism conducts the first path P1 and the second path P2; that is, in the two-way conduction state, the opening/closing mechanism distributes the refrigerant at the outlet end 22 of the condenser 20 to the first capillary tube 31 and the second capillary tube 32 at the same time, or distributes a part of the refrigerant to the first capillary tube 31 instead of the second capillary tube 32 and distributes another part of the refrigerant to the second capillary tube 32 instead of the first capillary tube 31, so that a part of the refrigerant can exchange heat with the muffler 11 when flowing through the first capillary tube 31, and another part of the refrigerant can exchange heat with the evaporator 40 when flowing through the second capillary tube 32.
In any two of the two-way conduction states, the opening/closing mechanism causes the refrigerant flowing through the second capillary tube 32 to have different distribution ratios of the refrigerant flowing through the capillary mechanism. That is, in the two-way conduction state, the refrigerant (for example, illustrated as M) flowing through the capillary mechanism is composed of the refrigerant (for example, illustrated as M1) flowing through the first capillary tube 31 and the refrigerant (for example, illustrated as M2) flowing through the second capillary tube 32 together (that is, the sum of the two constitutes the refrigerant flowing through the capillary mechanism, M1+ M2), and the distribution ratio is the percentage of the refrigerant (for example, illustrated as M2) flowing through the second capillary tube 32 in the refrigerant (for example, illustrated as M) (that is, M2/M).
And in any two of the two-way conduction states, the allocation ratios are different. That is, each of the two-way conduction states corresponds to an allocation ratio, or different allocation ratios define different two-way conduction states.
Typically, the enthalpy of the refrigerant in the evaporator 40 is lower than the enthalpy of the refrigerant in the return pipe 11, or alternatively, the temperature of the evaporator 40 is lower than the temperature of the return pipe 11. The temperature of the portion of muffler 11 adjacent to first capillary 31 defines the lowest ambient temperature at which first capillary 31 is located, and the temperature of the portion of evaporator 40 adjacent to second capillary 32 defines the lowest ambient temperature at which second capillary 32 is located, whereby the lowest ambient temperature at which first capillary 31 is located is higher than the lowest ambient temperature at which second capillary 32 is located.
The degree of supercooling of the refrigerant by heat exchange with the evaporator 40 when the refrigerant flows through the second capillary tube 32 can be increased, the proportion of the gas phase at the diameter expansion position between the evaporator 40 and the capillary mechanism can be reduced, the refrigerant flows into the evaporator 40 with a smaller dryness, and the noise and vibration emitted at the diameter expansion position can be reduced, compared with the case where the refrigerant exchanges heat with the muffler 11 when the refrigerant flows through the first capillary tube 31; on the contrary, compared with the heat exchange between the refrigerant and the evaporator 40 when the refrigerant flows through the second capillary tube 32, the heat exchange between the refrigerant and the air return tube 11 when the refrigerant flows through the first capillary tube 31 can reduce the loss of the refrigerant in the capillary mechanism to the cooling capacity of the evaporator 40, and improve the cooling efficiency of the refrigeration system 100.
Accordingly, in the refrigeration system 100 of the present embodiment, on the one hand, the degree of supercooling at the outlet end of the capillary mechanism can be increased by the heat exchange between the refrigerant and the muffler 11 and the evaporator 40 in the capillary mechanism, the gas phase ratio at the diameter expansion position between the evaporator 40 and the capillary mechanism can be reduced, the refrigerant flows into the evaporator 40 with a smaller dryness, and the noise and vibration emitted at the diameter expansion position can be reduced; on the other hand, by setting at least two of the two-way conduction states corresponding to different distribution ratios, the ratio of the refrigerant flowing through the first capillary tube 31 and the refrigerant flowing through the second capillary tube 32 can be adjusted, so that the balance and control between vibration reduction and noise reduction and high refrigeration efficiency are realized, and the performance of the refrigeration system 100 is optimized to meet the use requirements under different conditions.
Further, with reference to fig. 1 and 2, the refrigeration system 100 further includes a sensor 51 and a controller 52.
The sensor 51 is configured to sense a condition signal of the location of the diameter expansion between the capillary mechanism and the evaporator 40. The condition signal may be a vibration amplitude, and correspondingly, the sensor 51 may be implemented by any feasible component, such as a distance sensor, an acceleration sensor, and the like; alternatively, the condition signal may specifically be a noise value, and correspondingly, the sensor 51 may be implemented by a microphone or any other feasible component.
The diameter expanding position is formed at a subsequent pipeline accessory at the outlet end of the capillary mechanism. In one embodiment, the capillary mechanism is directly assembled at the inlet end of the evaporator 40, the pipe diameter of the refrigeration circuit is suddenly changed from the pipe diameter of the capillary mechanism to the pipe diameter of the evaporator 40, the inlet end of the evaporator 40 defines the expanding position, and the sensor 51 is configured at the inlet end of the evaporator 40 to sense the condition signal; in the preferred embodiment shown in fig. 1, the inlet end of the evaporator 40 is provided with a transition pipe 60, the capillary mechanism is connected to the evaporator 40 through the transition pipe 60, the inner diameter of the transition pipe 60 is larger than the inner diameter of the capillary mechanism and smaller than the inner diameter of the evaporator 40, the transition pipe 60 defines the expanding position, and the refrigerant is subjected to eruption phase change due to pressure reduction when flowing through the expanding position, so that the expanding position can be regarded as the eruption position between the capillary mechanism and the evaporator 40, and is often also the noise generation position, and the condition signal can be sensed by arranging the sensor 51 at the transition pipe 60.
Referring to fig. 2, the controller 52 is connected to the sensor 51 and the opening/closing mechanism, and configured to control the state change of the opening/closing mechanism according to the condition signal. Thus, the refrigerant burst at the diameter expansion position can be reflected according to the status signal at the diameter expansion position, and the controller 52 controls the state change of the opening and closing mechanism, for example, the distribution ratio is adjusted by adjusting the change of the opening and closing mechanism between the two-way conduction states, thereby realizing the effect of regulating and controlling the refrigeration efficiency and the noise/vibration of the refrigeration system 100.
Preferably, the opening/closing mechanism has an opening degree that is positively correlated with the distribution ratio, that is, the opening degree increases in synchronization with an increase in the distribution ratio. Thus, the controller 52 controls the switching mechanism to change between the two-way conduction states according to the condition signal, that is, controls the switching mechanism to change between two different opening degrees.
When the switching mechanism is in the current one of the two-way conduction states, the controller 52 determines whether the status signal meets a preset condition.
In an embodiment, the preset condition may be specifically that the preset vibration amplitude is greater than a preset vibration amplitude, and accordingly, if the condition signal meets the preset condition, that is, the vibration amplitude sensed by the sensor 51 is greater than the preset vibration amplitude; alternatively, the preset condition may be specifically that the preset noise value is greater than a preset noise value, and correspondingly, if the condition signal meets the preset condition, that is, the noise value sensed by the sensor 51 is greater than the preset noise value.
Further, in the aforementioned determination step, if the condition signal satisfies a preset condition, in this case, in response to a situation where the vibration at the diameter-expanded position is severe or the noise is large, the controller 52 controls the opening degree of the opening/closing mechanism to increase by a preset increase, so that the dryness is further reduced by flowing more refrigerant through the second capillary tube 32, thereby reducing the vibration and noise caused by the eruption at the diameter-expanded position; otherwise, that is, if the condition signal does not meet the preset condition, at this time, corresponding to the situation that the vibration at the diameter expansion position is not severe or the noise is low, the controller 52 controls the opening and closing mechanism to continue to maintain the current two-way conduction state, so that the refrigeration system 100 keeps the current refrigeration efficiency operation.
Further, the opening/closing mechanism has a plurality of the two-way conduction states in which the opening degree thereof is increased in increments with the preset increase as a tolerance. For example, the opening/closing mechanism has 4 two-way conduction states, which correspond to 20%, 40%, 60%, and 80% of the opening degree, respectively, and the preset increase is 20%, and each time the controller 52 controls the opening degree of the opening/closing mechanism to increase according to the condition signal, the preset increase is 20% of the current opening degree (for example, the current opening degree is 20%, and the preset increase is increased to 40% of the opening degree). Therefore, the opening degree of the opening and closing mechanism is gradually increased so as to gradually reach a proper balance point of the refrigeration efficiency and the noise/vibration, and the higher refrigeration efficiency is ensured while the vibration and the noise are reduced, so that the energy is saved and the consumption is reduced.
Further, in this embodiment, the opening and closing mechanism further has a first one-way conduction state and a second one-way conduction state.
In the first one-way conduction state, the opening degree of the opening/closing mechanism is zero, that is, in the first one-way conduction state, the opening/closing mechanism opens the first path P1 and cuts off the second path P2, so that the distribution ratio flowing through the second capillary tube 32 is zero, and the refrigerant at the outlet end 22 of the condenser 20 flows to the evaporator 40 through the first capillary tube 31 but cannot flow to the evaporator 40 through the second capillary tube 32.
The second one-way conduction state corresponds to the opening degree of the switching mechanism being 100%, that is, in the second one-way conduction state, the switching mechanism cuts off the first path P1 and conducts the second path P2 so that the distribution ratio flowing through the second capillary tube 32 is 100%, and the refrigerant at the outlet end 22 of the condenser 20 cannot flow to the evaporator 40 through the first capillary tube 31 but flows entirely to the evaporator 40 through the second capillary tube 32.
Preferably, in this embodiment, when the refrigeration system 100 operates, the controller 52 controls the switching mechanism to be in the first single-pass conducting state when controlling the compressor 10 to start, that is, the refrigeration system 100 is started in the mode with the highest refrigeration efficiency each time, and then is adjusted according to the noise/vibration condition, so that the temperature can be quickly lowered, energy is saved, consumption is reduced, and the problem of low refrigeration efficiency caused by blind noise reduction under unnecessary conditions is avoided.
Further, when the opening and closing mechanism is in the current state and continues for a preset duration, the preset duration may preferably be any value within a range of 2min to 3min, the sensor 51 senses the current status signal of the diameter-expanding position, and the controller 52 determines whether the status signal meets the preset condition and controls the state of the opening and closing mechanism according to the determination result. That is, every time the state of the opening and closing mechanism changes, the refrigeration system 100 is operated in the current state for the preset time period by the opening and closing mechanism, so that after the operation in the whole refrigeration system 100 is stable, the condition signal is sensed and whether the vibration/noise is too large is judged, and then whether the state of the opening and closing mechanism changes is controlled, thereby reducing the error caused by unstable operation when the refrigeration system 100 is just started, and enabling the sensing and controlling to be more accurate.
Further, the controller 52 needs to determine whether the opening/closing mechanism is in the second one-way conduction state, that is, whether the opening degree of the opening/closing mechanism reaches 100% whenever the condition signal meets the preset condition.
If the switching mechanism is in the second single pass conducting state, the controller 52 controls the switching mechanism to maintain the second single pass conducting state and continue to operate. If the switching mechanism is not in the second one-way conduction state, the controller 52 controls the opening degree of the switching mechanism to increase by the preset increase as described above.
In this embodiment, the sensor 52 may specifically include one or more than two sensing elements, and preferably, the number of the sensing elements is set to be more than two, and an average value of sensing results of the more than two sensing elements is used as the condition signal, so that the accuracy can be improved.
Further, as mentioned above, the inlet end of the evaporator 40 is provided with the transition pipe 60, and the inner diameter of the transition pipe 60 is larger than the inner diameter of the capillary mechanism and smaller than the inner diameter of the evaporator 40. From this, through setting up transition pipe 60, can realize the pipe diameter and expand gradually to reduce eruption noise and vibration to a certain extent.
Further, referring to fig. 1, the capillary mechanism includes a confluent capillary tube 33, and an outlet end of the confluent capillary tube 33 is connected to an inlet end of the transition tube 60, and may be connected in any manner such as welding, sleeving, or integral arrangement. The transition pipe 60 has an inner diameter larger than that of the junction capillary 33, whereby the expanded diameter position is defined at the transition pipe 60.
The first capillary 31 and the second capillary 32 are both connected to the evaporator 40 via the confluence capillary 33 and the transition pipe 60 in this order. By sharing the confluent capillary 33, the structural layout and the sensing of the diameter-expanded position by the sensor 51 are facilitated.
Further, the opening and closing mechanism includes a confluence valve 71. The confluence valve 71 is a two-in one-out valve, one inlet of which is coupled to the outlet end of the first capillary 31 and the other inlet of which is coupled to the outlet end of the second capillary 32, and the outlet of which is coupled to the inlet end of the confluence capillary 33.
In the first one-way conduction state, the controller 52 controls the confluence valve 71 to conduct the path from the first capillary 31 to the confluence capillary 33 and to cut off the path from the second capillary 32 to the confluence capillary 33; in the second one-way conduction state, the controller 52 controls the confluence valve 71 to cut off the path from the first capillary 31 to the confluence capillary 33 and to conduct the path from the second capillary 32 to the confluence capillary 33; in the above two-way conduction state, the controller 52 controls the confluence valve 71 to conduct a path from the first capillary 31 to the confluence capillary 33 and to conduct a path from the second capillary 32 to the confluence capillary 33.
Further, the capillary mechanism further includes a branch capillary 34, and the condenser 20 is respectively communicated to the first capillary 31 and the second capillary 32 through the branch capillary 34.
The opening and closing mechanism includes a diverter valve 72. The flow divider 72 is configured as a one-in-two-out valve, the inlet of which is coupled to the outlet end of the flow dividing capillary 34, one outlet of which is coupled to the inlet end of the first capillary 31 and the other outlet of which is coupled to the inlet end of the second capillary 32.
In the first one-way conduction state, the flow dividing valve 72 conducts the path from the flow dividing capillary 34 to the first capillary 31 and cuts off the path from the flow dividing capillary 34 to the second capillary 32; in the second one-way conduction state, the flow dividing valve 72 cuts off the path from the flow dividing capillary 34 to the first capillary 31 and conducts the path from the flow dividing capillary 34 to the second capillary 32; in the second one-way conduction state, the flow dividing valve 72 conducts the path from the flow dividing capillary 34 to the first capillary 31 and conducts the path from the flow dividing capillary 34 to the second capillary 32.
Preferably, the flow merging valve 71 and the flow dividing valve 72 may be both provided as solenoid valves, and both are connected to the controller 52 to cooperatively and synchronously operate under the control of the controller 52 to realize the change of the opening and closing mechanism in the first one-way conduction state, the second one-way conduction state, and at least two of the two-way conduction states. Of course, in a variant embodiment, also retaining either one of the flow dividing valve 72 and the flow joining valve 71, for example, eliminating the flow dividing valve 72 and only the flow joining valve 71, or for example, retaining the flow dividing valve 72 and eliminating the flow joining valve 71, makes it possible to achieve said first one-way conduction state, said second one-way conduction state and at least two of said two-way conduction states.
Referring to fig. 2, the present embodiment further provides a control method of a refrigeration system, the control method is suitable for controlling the refrigeration system 100, and the control method of the present embodiment is described below with reference to the structure of the refrigeration system 100, of course, the specific structure of the refrigeration system to which the control method is suitable is not limited to the refrigeration system 100. The control method comprises the following steps:
controlling the opening and closing mechanism to simultaneously conduct the first path P1 and the second path P2, that is, to allow a part of refrigerant of the condenser 20 to be distributed to the first capillary tube 31 instead of the second capillary tube 32 while another part of refrigerant is distributed to the second capillary tube 32 instead of the first capillary tube 31;
sensing a condition signal at a diameter expansion position between the capillary mechanism and the evaporator 40, wherein the condition signal is a vibration amplitude or a noise value;
judging whether the condition signal meets a preset condition, wherein the preset condition is that the vibration amplitude is larger than a preset vibration amplitude or larger than a preset noise value;
if it is, that is, the condition signal satisfies a predetermined condition, specifically, the vibration amplitude is greater than the predetermined vibration amplitude or the noise value is greater than the predetermined noise value, the opening degree of the opening and closing mechanism is increased to increase the distribution ratio of the refrigerant of the second path P2 in the refrigerant of the capillary mechanism;
and, it is determined whether or not the opening and closing mechanism still simultaneously conducts the first path P1 and the second path P2 at this time (i.e., after "increasing the opening degree of the opening and closing mechanism" is performed); if yes, returning to the step of sensing a condition signal of an expanding position between the capillary mechanism and the evaporator.
In the control method, the "return" action is performed at least once, and accordingly, the switching mechanism can ensure the conduction of the first path P1 and the second path P2 under at least two opening degrees, namely, at least two-way conduction states corresponding to the switching mechanism described above.
In combination with the above, on the one hand, the heat exchange between the refrigerant and the muffler 11 and the evaporator 40 in the capillary mechanism can increase the supercooling degree at the outlet end of the capillary mechanism, reduce the gas phase ratio at the diameter expansion position between the evaporator 40 and the capillary mechanism, and the refrigerant flows into the evaporator 40 with a smaller dryness, so that the noise and vibration emitted at the diameter expansion position are reduced; on the other hand, the distribution ratio is adjusted by the opening degree of the opening and closing mechanism, that is, the ratio of the refrigerant flowing through the first capillary tube 31 and the refrigerant flowing through the second capillary tube 32 is adjusted, when the vibration or noise at the diameter expansion position is large, more refrigerant is controlled to flow through the second capillary tube 32, the dryness of the refrigerant at the diameter expansion position is reduced to reduce the vibration and the noise, the performance of the refrigeration system 100 is optimized, and the balance control between the refrigeration efficiency and the vibration and the noise is realized to adapt to the use requirements under different situations.
Further, in the step "determining whether or not the opening and closing mechanism simultaneously turns on the first path P1 and the second path P2" at this time (i.e., after "increasing the opening degree of the opening and closing mechanism" is performed), "if the determination result is no, that is, the opening and closing mechanism turns on the second path P2 and cuts off the second path P1 at this time, that is, the opening and closing mechanism is in the second single-pass conduction state, the cycle is terminated, and the opening and closing mechanism is maintained in the second single-pass conduction state.
In the present embodiment, before the step "controlling the opening and closing mechanism to conduct the first path P1 and the second path P2":
controlling the compressor 10 to start, and simultaneously controlling the switching mechanism to conduct the first path P1 and cut off the second path P2, that is, the switching mechanism is in the first single-pass conducting state;
sensing the status signal at the diameter expansion position between the capillary mechanism and the evaporator 40, and judging whether the status signal meets the preset condition;
if yes, the opening degree of the opening and closing mechanism is increased so as to enter the step of controlling the opening and closing mechanism to conduct the first path and the second path.
That is, when the compressor 10 is controlled to start, the second path P2 is controlled to be cut off and the first path P1 is controlled to be conducted, so that the refrigerant exchanges heat with the air return pipe 11 of the compressor 10 when flowing through the first capillary 31, and thus, the refrigeration system 100 is ensured to start with high refrigeration efficiency, and then more refrigerants flow through the second capillary 32 successively according to the noise/vibration condition, so as to achieve the effects of vibration reduction and noise reduction.
Further, in this embodiment, in the step "determining whether the condition signal meets the preset condition", if the determination result is negative, that is, the vibration amplitude is not greater than the preset vibration amplitude or the noise value is not greater than the preset noise value, the current state of the opening and closing mechanism is kept unchanged without adjustment.
Preferably, each step of "sensing a condition signal of a location of enlargement of diameter between the capillary mechanism and the evaporator" is: when the current state of the opening and closing mechanism is kept to reach the preset time length, the preset time length can be preferably any value within the range of 2min-3min, and a current condition signal of the diameter expansion position between the capillary mechanism and the evaporator is sensed. That is, every time the state of the opening and closing mechanism changes, the refrigeration system 100 is operated in the current state for the preset time period by the opening and closing mechanism, so that after the operation in the whole refrigeration system 100 is stable, the condition signal is sensed, and further, whether the state of the opening and closing mechanism changes or not is controlled, thereby reducing the error caused by unstable operation when the refrigeration system 100 is just started, and enabling the sensing and controlling to be more accurate.
In the control method, the increase in the opening degree of the opening/closing mechanism is constant at any time. As described above, each time the opening degree of the opening and closing mechanism is increased by a predetermined width, which is a constant, for example, 20% as described above, the opening degree of the opening and closing mechanism is controlled to be increased by 20% from the current opening degree. Therefore, the opening degree of the opening and closing mechanism is gradually increased so as to gradually reach a proper balance point of the refrigeration efficiency and the noise/vibration, and the higher refrigeration efficiency is ensured while the vibration and the noise are reduced, so that the energy is saved and the consumption is reduced.
Referring to a part of the structure schematic of the refrigeration system of the second embodiment of the present invention shown in fig. 3, the present embodiment is different from the first embodiment only in the connection structure between the merging capillary 33 and the evaporator 40, and only the difference will be described below, and the rest is the same as the first embodiment and will not be described again.
In this embodiment, the evaporator has a cylindrical tube 410 defining its inlet end 41 and a lumen 411 enclosed by the cylindrical tube 410; the outlet end of the junction capillary tube 33 and the transition tube 60 are housed in the lumen 411 and are surrounded by the refrigerant in the lumen 411. Therefore, on one hand, the diameter-expanding position between the capillary mechanism and the evaporator is covered by a wrapping, the refrigerant eruption noise in the transition pipe 60 behind the confluence capillary tube 33 is wrapped by the refrigerant in the tube cavity 411 to reduce leakage, on the other hand, the vibration caused by eruption can be counteracted by the refrigerant to reduce the vibration noise caused by the vibration transmitted outwards, on the other hand, the confluence capillary tube 33 is wrapped in the tube cavity 411 to ensure that the refrigerant can exchange heat with the refrigerant in the evaporator 40 when flowing through the confluence capillary tube 33, so that the supercooling degree in the confluence capillary tube 33 is increased, the dryness of the refrigerant at the diameter-expanding position is reduced, and the problems of eruption noise/vibration are further eliminated.
Preferably, at least a part of the transition pipe 60 is provided as a perforated pipe 61 having a plurality of through holes 610, and the interior of the perforated pipe 61 is communicated with the lumen 411 via the through holes 610. Thus, when the refrigerant is spouted in the transition duct 60, the large bubbles generated due to the pressure drop are broken into small bubbles while passing through the through-holes 610, thereby reducing the noise of bubble breakage.
In this embodiment, a portion of the outlet end of the transition duct 60 is provided as a perforated duct 61.
The cylindrical tube 410 is provided with a closed end surface 412, the porous tube 61 is arranged coaxially with the cylindrical tube 410 and the end (i.e., the end away from the confluent capillary 33) thereof abuts against the closed end surface 412; the refrigerant in the lumen 411 flows from the transition pipe 60 to the junction capillary 33 as indicated by the arrow in fig. 3. That is, the flow direction of the refrigerant in the interflow capillary tube 33 and the transition pipe 60 is just opposite to the flow direction of the refrigerant in the lumen 411.
In addition, the closed end surface 412 has a flow guiding protrusion 4120 protruding toward the porous pipe 61 at the center, and the closed end surface 412 is disposed to extend outward from the flow guiding protrusion 4120 in an arc shape to the cylindrical pipe 410. Therefore, the refrigerant can flow into the tube cavity 411 smoothly from the inside of the porous tube 61, and turbulence, vibration or noise caused by violent collision can be avoided.
The third embodiment of the invention also provides a refrigeration appliance which can be specifically set to be a refrigerator, a freezer or other appliances with low-temperature storage functions. The refrigeration appliance further comprises a refrigeration system as described in any of the previous first or second embodiments.
In conclusion, the beneficial effects of the invention are as follows: on one hand, the supercooling degree at the outlet end of the capillary mechanism can be increased by the heat exchange between the refrigerant and the air return pipe 11 and the evaporator 40 in the capillary mechanism, the gas phase proportion at the diameter expansion position between the evaporator 40 and the capillary mechanism is reduced, the refrigerant flows into the evaporator 40 with smaller dryness, and the noise and vibration emitted at the diameter expansion position are reduced; on the other hand, by setting at least two of the two-way conduction states corresponding to different distribution ratios, the ratio of the refrigerant flowing through the first capillary tube 31 and the refrigerant flowing through the second capillary tube 32 can be adjusted, so that the balance and control between vibration reduction and noise reduction and high refrigeration efficiency are realized, and the performance of the refrigeration system 100 is optimized to meet the use requirements under different conditions.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The detailed description set forth above is merely a specific description of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include within the scope of the invention equivalent embodiments or modifications that do not depart from the technical spirit of the present invention.

Claims (17)

1. A refrigeration system comprising:
a compressor;
a condenser, the inlet end of which is connected to the exhaust pipe of the compressor;
the outlet end of the evaporator is connected with the air return pipe of the compressor;
a capillary mechanism in communication between the outlet end of the condenser and the inlet end of the evaporator, wherein the capillary mechanism comprises a first capillary tube and a second capillary tube arranged in parallel, the first capillary tube is attached to the muffler, and the second capillary tube is attached to the evaporator;
the opening and closing mechanism is matched and connected with the capillary mechanism and has at least two double-path conduction states;
when any two-way conduction state is realized, the opening and closing mechanism conducts a first path from the condenser to the evaporator through the first capillary tube and a second path from the condenser to the evaporator through the second capillary tube;
in any two of the two-way conduction states, the opening/closing mechanism causes the refrigerant flowing through the second capillary tube to have a different distribution ratio of the refrigerant flowing through the capillary mechanism.
2. The refrigerant system as set forth in claim 1, further including:
a sensor configured to sense a condition signal of a diameter expansion position between the capillary mechanism and the evaporator, the condition signal being a vibration amplitude or a noise value;
and the controller is connected with the sensor and the opening and closing mechanism and is configured to control the state change of the opening and closing mechanism according to the condition signal.
3. The refrigeration system according to claim 2, wherein the opening-closing mechanism has an opening degree that is positively correlated with the distribution ratio;
when the switching mechanism is in the current two-way conduction state and the condition signal meets a preset condition, the controller controls the opening degree of the switching mechanism to increase by a preset amplification degree; otherwise, the controller controls the switching mechanism to continuously keep the current two-way conduction state;
the preset condition is that the preset vibration amplitude is larger than a preset vibration amplitude or larger than a preset noise value.
4. The refrigeration system according to claim 3, wherein the opening/closing mechanism has a plurality of the two-way conduction states in which an opening degree thereof is increased by a tolerance of the preset increase.
5. The refrigeration system as recited in claim 4 wherein said opening and closing mechanism further has a first one-way conduction state corresponding to a zero degree of opening and a second one-way conduction state corresponding to a 100% degree of opening;
when the first single-path conduction state is realized, the switching mechanism conducts the first path and cuts off the second path;
and when the second single-path conduction state is realized, the switching mechanism cuts off the first path and conducts the second path.
6. The refrigeration system according to claim 5, wherein the sensor senses the current condition signal of the diameter-expanding position when the opening/closing mechanism is in the current state for a predetermined duration, and the controller controls the opening degree of the opening/closing mechanism to increase the predetermined increase if the condition signal meets a predetermined condition and the opening/closing mechanism is not in the second one-way conduction state.
7. A refrigeration system according to claim 5, wherein the inlet end of the evaporator is provided with a transition tube having an internal diameter greater than the internal diameter of the capillary means, the transition tube communicating the capillary means with the evaporator and defining the location of said enlarged diameter, the sensor being mounted to the transition tube.
8. The refrigeration system according to claim 7, wherein the capillary mechanism comprises a confluent capillary, and the first capillary and the second capillary are communicated to the evaporator through the confluent capillary and the transition pipe in sequence;
the opening and closing mechanism comprises a flow-merging valve, and the flow-merging valve is arranged between the flow-merging capillary and the first capillary and between the flow-merging capillary and the second capillary;
when the two-way conduction state is realized, the flow merging valve conducts a path from the first capillary to the flow merging capillary and conducts a path from the second capillary to the flow merging capillary;
in the first one-way conduction state, the confluence valve conducts a path from the first capillary to the confluence capillary and cuts off a path from the second capillary to the confluence capillary;
in the second one-way conduction state, the confluence valve cuts off a path from the first capillary to the confluence capillary and conducts a path from the second capillary to the confluence capillary.
9. The refrigeration system of claim 5, wherein the capillary mechanism comprises a diversion capillary tube and a diversion valve, and the condenser is communicated to the first capillary tube and the second capillary tube through the diversion capillary tube respectively;
the opening and closing mechanism comprises a flow dividing valve, and the flow dividing valve is arranged between the flow dividing capillary and the first capillary and between the flow dividing capillary and the second capillary;
when the two-way conduction state is realized, the flow dividing valve conducts a path from the flow dividing capillary tube to the first capillary tube and conducts a path from the flow dividing capillary tube to the second capillary tube;
when the first single-way conduction state is realized, the path from the diversion capillary to the first capillary is conducted by the diversion valve, and the path from the diversion capillary to the second capillary is cut off;
and when the second single-way conduction state is realized, the shunt valve cuts off the path from the shunt capillary to the first capillary and conducts the path from the shunt capillary to the second capillary.
10. The refrigeration system of claim 1 wherein said first capillary tube is attached to said muffler at least one of wound around the outside of said muffler and juxtaposed to the outside of said muffler through the inside of said muffler; and/or the like, and/or,
the second capillary tube is attached to the evaporator in at least one of a manner of winding outside the evaporator, side by side outside the evaporator, and penetrating inside the evaporator.
11. A refrigeration system comprising:
a compressor;
a condenser, the inlet end of which is connected to the exhaust pipe of the compressor;
the outlet end of the evaporator is connected with the air return pipe of the compressor;
the capillary mechanism is communicated between the outlet end of the condenser and the inlet end of the evaporator, and is characterized by comprising a first capillary tube and a second capillary tube which are arranged in parallel, wherein the lowest ambient temperature of the first capillary tube is higher than that of the second capillary tube;
the opening and closing mechanism is matched and connected with the capillary mechanism and has at least two double-path conduction states;
when any two-way conduction state is realized, the opening and closing mechanism conducts a first path from the condenser to the evaporator through the first capillary tube and a second path from the condenser to the evaporator through the second capillary tube;
in any two of the two-way conduction states, the opening/closing mechanism causes the refrigerant flowing through the second capillary tube to have a different distribution ratio of the refrigerant flowing through the capillary mechanism.
12. A refrigeration appliance, characterized in that it comprises a refrigeration system according to any one of claims 1 to 11.
13. The control method of the refrigeration system comprises a compressor, a condenser, a capillary mechanism and an evaporator which are sequentially connected in series, and is characterized in that the capillary mechanism comprises a first capillary tube and a second capillary tube which are arranged in parallel; the condenser forms a first path from the first capillary tube to the evaporator, and refrigerant exchanges heat with a return air pipe of the compressor when flowing through the first capillary tube; the condenser forms a second path from the condenser to the evaporator through the second capillary tube, and refrigerant exchanges heat with the evaporator when flowing through the second capillary tube; the control method comprises the following steps:
controlling an opening and closing mechanism to simultaneously conduct the first path and the second path;
sensing a condition signal of an expanding position between the capillary mechanism and the evaporator, wherein the condition signal is a vibration amplitude or a noise value;
judging whether the condition signal meets a preset condition, wherein the preset condition is that the vibration amplitude is larger than a preset vibration amplitude or larger than a preset noise value;
if so, increasing the opening degree of the opening and closing mechanism to increase the distribution ratio of the refrigerant of the second path in the refrigerant of the capillary mechanism;
if the opening and closing mechanism still conducts the first path and the second path at the same time, returning to the step of sensing a condition signal of an expanding position between the capillary mechanism and the evaporator to perform next circulation; wherein the "return" action is performed at least once in the control method.
14. The control method of the refrigeration system according to claim 13, further comprising:
if the opening and closing mechanism conducts the second path and cuts off the second path at this time, the cycle is terminated.
15. The control method of the refrigeration system according to claim 13, wherein before the step of "controlling the opening and closing mechanism to conduct the first path and the second path":
controlling the compressor to start, and simultaneously controlling the switching mechanism to conduct the first path and cut off the second path;
sensing the condition signal of the diameter expansion position between the capillary mechanism and the evaporator, and judging whether the condition signal meets the preset condition;
if yes, the opening degree of the opening and closing mechanism is increased so as to enter the step of controlling the opening and closing mechanism to conduct the first path and the second path.
16. The control method of a refrigeration system according to any one of claims 13 to 15, wherein each of the steps of "sensing the condition signal of the position of expansion between the capillary mechanism and the evaporator" is:
and sensing a current condition signal of a diameter expansion position between the capillary mechanism and the evaporator when the opening and closing mechanism keeps the current state to reach a preset time length.
17. The control method of a refrigeration system according to any one of claims 13 to 15, characterized in that in the control method, the increase in the opening degree of the opening-closing mechanism is a constant at any time.
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CN102933922A (en) * 2009-09-29 2013-02-13 皇家飞利浦电子股份有限公司 Heat exchange system and method of producing the same
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