Refrigeration system and control method thereof, and refrigeration appliance having the same

Abstract

The application discloses a refrigeration system, a control method thereof and a refrigeration appliance with the refrigeration system. The refrigeration system comprises a compressor, a condenser connected with an outlet end of the compressor, an evaporator connected with a return pipe of the compressor, and a capillary mechanism communicated between the condenser and 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 return pipe of the compressor, and the second capillary tube is attached to the evaporator; the refrigeration system further comprises an opening and closing mechanism, wherein the opening and closing mechanism comprises a flow dividing valve matched with an inlet end of the first capillary tube and an inlet end of the second capillary tube; the flow dividing valve can make refrigerant at the condenser be distributed to the second capillary tube instead of the first capillary tube, or be simultaneously distributed to the first capillary tube and the second capillary tube. Thus, by two different states of the flow dividing valve, switching between two operation modes of high refrigeration efficiency and vibration reduction and noise reduction of the refrigeration system can be realized.

Description

Technical Field

[0001] This invention relates to a refrigeration system and its control method, as well as a refrigeration appliance having the refrigeration system, belonging to the field of household appliance technology. Background Technology

[0002] In most modern refrigerators and freezers, a capillary tube is typically used for throttling and pressure reduction between the condenser and evaporator in the refrigeration system. In principle, high-pressure, medium-temperature liquid refrigerant enters the capillary tube. Due to friction on the capillary tube wall, the resistance to the refrigerant gradually increases, and the refrigerant pressure and temperature gradually decrease. Finally, at the expanded diameter position at the capillary tube outlet, it reaches a two-phase refrigerant state at evaporation pressure and then enters the evaporator at high speed.

[0003] However, at the connection between the capillary tube and the evaporator, the sudden increase in the pipe's inner diameter causes a rapid pressure change. As the refrigerant is ejected at high speed from the capillary tube, it easily undergoes a phase change, generating numerous bubbles. With the pressure continuously decreasing, these bubbles enlarge until they burst, producing ejection noise. Furthermore, the violent impact of the refrigerant during ejection also causes vibrations in the refrigeration piping. This vibration is transmitted along the piping to the appliance's casing, also generating vibration noise. All of these noises contribute to an overall increase in the noise level of the refrigeration appliance, resulting in a very poor user experience.

[0004] On the other hand, the refrigeration efficiency of the refrigeration system is also one of its important performance indicators. Therefore, how to coordinate the refrigeration efficiency of the refrigeration system with vibration reduction and noise reduction is an important issue in this field. Summary of the Invention

[0005] To address the problems in the prior art, the present invention provides a refrigeration system and its control method, as well as a refrigeration appliance having the refrigeration system.

[0006] To achieve the above objectives, one embodiment of the present invention provides a refrigeration system. The refrigeration system includes a compressor, a condenser connected to the outlet end of the compressor, an evaporator connected to the return pipe of the compressor, and a capillary mechanism communicating between the condenser and the evaporator. The capillary mechanism includes a first capillary tube and a second capillary tube arranged in parallel, the first capillary tube being attached to the return pipe of the compressor, and the second capillary tube being attached to the evaporator.

[0007] The refrigeration system further includes an opening and closing mechanism, which includes a flow divider valve connected to the inlet end of the first capillary tube and the inlet end of the second capillary tube.

[0008] The diverter valve can distribute the refrigerant at the condenser to the second capillary tube instead of the first capillary tube, or to both the first and second capillary tubes simultaneously.

[0009] More preferably, the capillary mechanism includes a second common capillary tube, and the condenser is connected to the first capillary tube and the second capillary tube respectively through the second common capillary tube;

[0010] The diverter valve is disposed between the second common capillary tube and the first capillary tube, and between the second common capillary tube and the second capillary tube.

[0011] More preferably, the diversion valve is configured as a solenoid valve with one inlet and two outlets.

[0012] More preferably, the opening and closing mechanism includes a confluence valve, which is connected to the outlet end of the first capillary and the outlet end of the second capillary.

[0013] The confluence valve allows the evaporator to receive refrigerant from the second capillary tube instead of the first capillary tube, or to receive refrigerant from both the first and second capillary tubes simultaneously.

[0014] More preferably, the capillary mechanism includes a first common capillary tube, and the first capillary tube and the second capillary tube are both sequentially connected to the evaporator via the first common capillary tube;

[0015] The opening and closing mechanism includes a confluence valve, which is disposed between the first common capillary tube and the first capillary tube, and between the first common capillary tube and the second capillary tube.

[0016] More preferably, the confluence valve is configured as a two-inlet, one-outlet solenoid valve.

[0017] More preferably, the inlet end of the evaporator is provided with a transition tube with an inner diameter larger than that of the capillary mechanism, the transition tube connecting the capillary mechanism and the evaporator.

[0018] More preferably, the evaporator has a cylindrical tube defining its inlet end and a cavity enclosed by the cylindrical tube;

[0019] The outlet end of the capillary mechanism and the transition tube are both housed in the cavity and enclosed by the refrigerant in the cavity.

[0020] More preferably, the cylindrical tube is provided with a closed end face; at least a portion of the transition tube is provided as a porous tube with a plurality of through holes, the porous tube is coaxially arranged with the cylindrical tube and its end abuts against the closed end face, and the interior of the porous tube is connected to the tube cavity through the through holes;

[0021] The center of the closed end face has a flow guide protrusion that protrudes toward the porous tube, and the closed end face is arranged to extend outward from the flow guide protrusion in an arc shape to the cylindrical tube.

[0022] More preferably, the refrigeration system further includes:

[0023] The acquisition module is configured to sense the eruption characterization parameters at the expansion position between the capillary mechanism and the evaporator, wherein the eruption characterization parameters are vibration amplitude or noise value.

[0024] The control module connects the acquisition module and the opening / closing mechanism, and controls the opening / closing mechanism according to the eruption characterization parameters.

[0025] To achieve the above objectives, one embodiment of the present invention provides a refrigeration system. The refrigeration system includes a compressor, a condenser connected to the outlet end of the compressor, an evaporator connected to the return pipe of the compressor, and a capillary mechanism connecting the condenser and the evaporator. The capillary mechanism includes a first capillary tube and a second capillary tube arranged in parallel, wherein the lowest ambient temperature of the first capillary tube is higher than the lowest ambient temperature of the second capillary tube.

[0026] The refrigeration system further includes an opening and closing mechanism, which includes a flow divider valve connected to the inlet end of the first capillary tube and the inlet end of the second capillary tube.

[0027] The diverter valve can distribute the refrigerant at the condenser to the second capillary tube instead of the first capillary tube, or to both the first and second capillary tubes simultaneously.

[0028] To achieve the above objectives, one embodiment of the present invention provides a refrigeration appliance that includes the refrigeration system.

[0029] To achieve the above objectives, one embodiment of the present invention provides a control method for the refrigeration system. The refrigeration system includes:

[0030] The flow divider valve connects the condenser to both the first and second capillary tubes simultaneously.

[0031] When the vibration amplitude at the expansion position between the evaporator and the capillary mechanism is greater than the preset vibration amplitude or the noise value is greater than the preset noise value, the control diversion valve connects the condenser to the second capillary tube but not to the first capillary tube.

[0032] More preferably, the control method further includes:

[0033] After the state that "the diverter valve controls the condenser to communicate with both the first capillary tube and the second capillary tube" is maintained for a preset duration, the step of "when the vibration amplitude at the diameter-expanding position between the evaporator and the capillary mechanism is greater than a preset vibration amplitude or the noise value is greater than a preset noise value, controlling the diverter valve to make the condenser communicate with the second capillary tube instead of the first capillary tube" is performed.

[0034] Compared with the prior art, the beneficial effects of the present invention are: based on the first capillary tube and the second capillary tube connected in parallel, the lowest ambient temperature where the first capillary tube is located is higher than the lowest ambient temperature where the second capillary tube is located, and through two different working states of the diverter valve, switching between two operation modes of high refrigeration efficiency and vibration and noise reduction can be realized for the refrigeration system. In this way, the on-off state of the first capillary tube can be adjusted as required, thereby ensuring the refrigeration efficiency and greatly reducing the possibility of noise / vibration caused by flashing. Description of Drawings

[0035] Figure 1 is a schematic structural diagram of the refrigeration system according to the first embodiment of the present invention;

[0036] Figure 2 is a logic flow chart of the control method for the refrigeration system according to the first embodiment of the present invention;

[0037] Figure 3 is a partial structural schematic diagram of the refrigeration system according to the second embodiment of the present invention. Detailed Description of Embodiments

[0038] Hereinafter, the present invention will be described in detail with reference to specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present invention.

[0039] Refer to Figures 1 to 2 the refrigeration system 100 of the first embodiment of the present invention and a control method for a refrigeration system are illustrated.

[0040] Refe Figure 1 r to, the refrigeration system 100 comprises a compressor 10, a condenser 20, a capillary mechanism, an evaporator 40 and an opening-closing mechanism.

[0041] In this system, the compressor 10, condenser 20, capillary mechanism, and evaporator 40 are connected in series to form a closed loop in which the refrigerant supplied to the refrigeration system 100 circulates through the compressor 10, condenser 20, capillary mechanism, and evaporator 40, and then returns to the compressor 10. Specifically, the outlet end of the compressor 10 is configured as an exhaust pipe 12, which is connected to the inlet end 21 of the condenser 20; the inlet end of the compressor 10 is configured as a return pipe 11, which is connected to the outlet end 42 of the evaporator 40; and the capillary mechanism connects the outlet end 22 of the condenser 20 and the inlet end of the evaporator 40.

[0042] The refrigerant circulation process in the refrigeration system 100 is roughly as follows: the high-temperature and high-pressure superheated refrigerant gas at the outlet of the compressor 10 enters the condenser 20 through the exhaust pipe 12, is condensed into a high-pressure saturated or subcooled liquid, and then enters the capillary mechanism for throttling and pressure reduction; then it is injected into the evaporator 40 and vaporized into a low-temperature and low-pressure refrigerant gas; finally, it returns to the compressor 10 through the return pipe 11, is recompressed by the compressor 10 into a high-temperature and high-pressure superheated refrigerant gas, and is then discharged, thus completing the entire circulation process.

[0043] The capillary mechanism includes a first capillary tube 31 and a second capillary tube 32 arranged in parallel.

[0044] The first capillary tube 31 is attached to the return pipe 11 so that the refrigerant can exchange heat with the return pipe 11 when it flows through the first capillary tube 31. Therefore, the attachment of the first capillary tube 31 to the return pipe 11 can be implemented in various ways, such as: Figure 1 In the embodiment shown, the first capillary tube 31 is attached to the return gas pipe 11 in a manner parallel to the outside of the return gas pipe 11. The parallel arrangement can be such that the refrigerant flows in the same or opposite directions, or the first capillary tube 31 and the return gas pipe 11 are in close contact or slightly separated from each other. In a variation embodiment, the first capillary tube 31 is attached to the return gas pipe 11 in a manner wrapped around the outside of the return gas pipe 11. Similarly, the first capillary tube 31 and the return gas pipe 11 can be in close contact or slightly separated from each other. In yet another variation embodiment, the first capillary tube 31 is attached to the return gas pipe 11 in a manner that penetrates the inside of the return gas pipe 11. Specifically, the first capillary tube 31 can be inserted into the pipe wall of the return gas pipe 11 or into the internal pipe of the return gas pipe 11. Of course, based on the principle of this invention that "the refrigerant can exchange heat with the return pipe 11 when it flows through the first capillary tube 31", other combinations other than the aforementioned examples made by those skilled in the art can also constitute the attachment of the first capillary tube 31 and the return pipe 11.

[0045] The second capillary tube 32 is attached to the evaporator 40 so that the refrigerant can exchange heat with the evaporator 40 as it flows through the second capillary tube 32. Similarly, based on this, the attachment of the second capillary tube 32 to the evaporator 40 can be implemented in various ways, such as: Figure 1 In the illustrated embodiment, the second capillary tube 32 is attached to the evaporator 40 by wrapping around its exterior. The second capillary tube 32 and the evaporator 40 may be in close contact or slightly separated. In a variation, the second capillary tube 32 is attached to the evaporator 40 side-by-side, either with the refrigerant flowing in the same or opposite directions, or with the second capillary tube 32 in close contact or slightly separated. In yet another variation, the second capillary tube 32 is attached to the evaporator 40 by penetrating its interior. Specifically, the second capillary tube 32 may be inserted into the tube wall of the evaporator 40 or into an internal pipe of the evaporator 40. Of course, based on the principle of this invention that "the refrigerant can exchange heat with the evaporator 40 when flowing through the second capillary tube 32," other configurations besides the aforementioned examples can also constitute the attachment of the second capillary tube 32 to the evaporator 40.

[0046] The opening and closing mechanism is operatively coupled to the capillary mechanism, and its operation enables the refrigeration system 100 to have a strong noise reduction mode and a balanced mode.

[0047] In the balanced mode, the opening and closing mechanism connects the first path P1 and the second path P2. That is, in the balanced mode, the opening and closing mechanism causes the refrigerant at the outlet 22 of the condenser 20 to be simultaneously distributed to the first capillary tube 31 and the second capillary tube 32. In other words, part of the refrigerant is distributed to the first capillary tube 31 instead of the second capillary tube 32, while another part of the refrigerant is distributed to the second capillary tube 32 instead of the first capillary tube 31. In this way, part of the refrigerant can exchange heat with the return pipe 11 when flowing through the first capillary tube 31, and the other part of the refrigerant can exchange heat with the evaporator 40 when flowing through the second capillary tube 32.

[0048] In the strong noise reduction mode, the opening and closing mechanism cuts off the first path P1 from the condenser 20 through the first capillary tube 31 to the evaporator 40, and opens the second path P2 from the condenser 20 through the second capillary tube 32 to the evaporator 40. That is, in the strong noise reduction mode, the opening and closing mechanism distributes the refrigerant at the condenser 20 to the second capillary tube 32 instead of the first capillary tube 31. Therefore, all the refrigerant flows through the second capillary tube 32 and exchanges heat with the evaporator 40.

[0049] Typically, the enthalpy of the refrigerant in the evaporator 40 is lower than that of the refrigerant in the return pipe 11, or in other words, the temperature of the evaporator 40 is lower than the temperature of the return pipe 11. The temperature of the portion of the return pipe 11 near the first capillary tube 31 defines the minimum ambient temperature of the first capillary tube 31, and the temperature of the portion of the evaporator 40 near the second capillary tube 32 defines the minimum ambient temperature of the second capillary tube 32. Thus, the minimum ambient temperature of the first capillary tube 31 is higher than that of the second capillary tube 32.

[0050] Compared to the refrigerant exchanging heat with the return pipe 11 when flowing through the first capillary tube 31, the refrigerant exchanging heat with the evaporator 40 when flowing through the second capillary tube 32 can increase subcooling and reduce the gas phase ratio at the expansion position between the evaporator 40 and the capillary mechanism. The refrigerant flows into the evaporator 40 with a lower dryness, which reduces the noise and vibration emitted at the expansion position. Conversely, compared to the refrigerant exchanging heat with the evaporator 40 when flowing through the second capillary tube 32, the refrigerant exchanging heat with the return pipe 11 when flowing through the first capillary tube 31 can reduce the loss of cooling capacity of the evaporator 40 by the refrigerant in the capillary mechanism and improve the cooling efficiency of the refrigeration system 100.

[0051] Therefore, when the refrigeration system 100 of this embodiment is in the balanced mode, it can achieve low noise and low vibration operation while ensuring high refrigeration efficiency. When it is in the strong noise reduction mode, it can further reduce vibration and noise, thereby enabling the refrigeration system 100 to switch between high refrigeration efficiency operation and low noise operation to adapt to the usage requirements under different conditions.

[0052] Furthermore, participants Figure 1 The capillary mechanism also includes a second common capillary tube 34, through which the condenser 20 is connected to the first capillary tube 31 and the second capillary tube 32 respectively.

[0053] The opening and closing mechanism includes a diverter valve 72. The diverter valve 72 is configured as a one-inlet, two-outlet valve, with its inlet connected to the outlet end of the second common capillary tube 34, one outlet connected to the inlet end of the first capillary tube 31, and its other outlet connected to the inlet end of the second capillary tube 32.

[0054] In the strong noise reduction mode, the diverter valve 72 disconnects the second common capillary tube 34 from the first capillary tube 31 and connects the second common capillary tube 34 to the second capillary tube 32, so that all the refrigerant in the second common capillary tube 34 is distributed to the second capillary tube 32 instead of the first capillary tube 31; in the balanced mode, the diverter valve 72 connects the second common capillary tube 34 to both the first capillary tube 31 and the second capillary tube 32, so that the refrigerant in the second common capillary tube 34 is simultaneously distributed to both the first capillary tube 31 and the second capillary tube 32.

[0055] Furthermore, the capillary mechanism includes a first common capillary tube 33, the outlet end of which is connected to the evaporator 40, and the evaporator 40 is connected to the first capillary tube 31 and the second capillary tube 32 respectively through the first common capillary tube 33.

[0056] The opening and closing mechanism includes a confluence valve 71. The confluence valve 71 is a two-inlet, one-outlet valve, with one inlet connected to the outlet end of the first capillary tube 31 and the other inlet connected to the outlet end of the second capillary tube 32, and its outlet connected to the inlet end of the first common capillary tube 33.

[0057] In the strong noise reduction mode, the confluence valve 71 disconnects the first capillary 31 from the first common capillary 33 and connects the second capillary 32 to the first common capillary 33; in the balanced mode, the confluence valve 71 connects the first capillary 31 to the first common capillary 33 and connects the second capillary 32 to the first common capillary 33.

[0058] Preferably, both the confluence valve 71 and the diverter valve 72 can be configured as solenoid valves, and both can be connected to the control module 52 described later to operate synchronously under the control of the control module 52, thereby realizing the change between the strong noise reduction mode and the balanced mode. Of course, in the variant embodiments, either the diverter valve 72 or the confluence valve 71 can be retained. For example, the diverter valve 72 can be removed and only the confluence valve 71 can be retained, or the diverter valve 72 can be retained and the confluence valve 71 can be removed, which can also realize the strong noise reduction mode and the balanced mode.

[0059] Further preferred, in Figure 1 In the preferred embodiment shown, a transition tube 60 is provided at the inlet end of the evaporator 40. The capillary mechanism is connected to the evaporator 40 through the transition tube 60. The inner diameter of the transition tube 60 is larger than the inner diameter of the capillary mechanism but smaller than the inner diameter of the evaporator 40. Specifically, the first common capillary tube 33 is connected to the inlet end of the transition tube 60, which can be done by welding, sleeve connection, or integral installation. The inner diameter of the transition tube 60 is larger than the inner diameter of the first common capillary tube 33. Thus, the transition tube 60 defines an expansion position. When the refrigerant flows through this expansion position, it will undergo a phase change due to pressure reduction. Therefore, this expansion position can be regarded as the eruption position between the capillary mechanism and the evaporator 40, which is often also the noise generation position. In this embodiment, by setting the transition tube 60, the tube diameter can be gradually increased, thereby reducing eruption noise and vibration to a certain extent.

[0060] The first capillary tube 31 and the second capillary tube 32 are both connected to the evaporator 40 via the first common capillary tube 33 and the transition tube 60. The shared first common capillary tube 33 facilitates the structural layout of the transition tube 60.

[0061] Furthermore, the refrigeration system 100 also includes a data acquisition module 51 and a control module 52.

[0062] The acquisition module 51 is configured to sense the eruption characterization parameters at the expansion position between the capillary mechanism and the evaporator 40. Specifically, the eruption characterization parameters can be vibration amplitude, and the acquisition module 51 can be implemented using any feasible component such as a distance sensor or an acceleration sensor; alternatively, the eruption characterization parameters can be noise values, and the acquisition module 51 can be implemented using a microphone or other feasible component.

[0063] The connection point between the capillary mechanism and the transition tube 60 defines the expansion position. In this embodiment, as mentioned above, the capillary mechanism connects to the transition tube 60 at the transition tube 60, which defines the expansion position. The emission characterization parameters can be sensed by installing the acquisition module 51 on the transition tube 60. However, this is not the only possibility. For example, in a variation embodiment, the capillary mechanism (specifically, the first common capillary tube 33) is directly assembled at the inlet end of the evaporator 40. The diameter of the refrigeration circuit changes abruptly from the diameter of the capillary mechanism (specifically, the first common capillary tube 33) to the diameter of the evaporator 40, thus defining the expansion position at the inlet end of the evaporator 40. The emission characterization parameters can be sensed by configuring the acquisition module 51 at the inlet end of the evaporator 40.

[0064] The control module 52 is connected to the acquisition module 51 and the opening / closing mechanism, and is configured to control the opening / closing mechanism to operate according to the eruption characterization parameters, thereby causing the refrigeration system 100 to switch between the strong noise reduction mode and the balanced mode. Thus, based on the eruption characterization parameters at the diameter expansion position, the refrigerant eruption situation at the diameter expansion position can be reflected. The control module 52 controls the opening / closing mechanism to operate, thereby controlling the refrigeration system 100 to achieve the effect of regulating refrigeration efficiency and noise / vibration.

[0065] Preferably, combined with Figure 2 In this embodiment, when the refrigeration system 100 is running, the control module 52 controls the refrigeration system 100 to be in the balanced mode when the compressor 10 is started. That is, the refrigeration system 100 is in a state of high refrigeration efficiency and low dryness to reduce the noise of the ejection each time it is started. Then, it determines whether to adjust the mode according to the noise / vibration situation. This can quickly lower the temperature, save energy and reduce consumption, and avoid the problem of low refrigeration efficiency caused by blindly and excessively lowering the dryness to reduce noise in unnecessary situations.

[0066] Furthermore, when the cooling system 100 is in the balanced mode, the control module 52 determines whether the eruption characterization parameters meet the preset conditions.

[0067] In one embodiment, the preset condition may specifically be greater than a preset vibration amplitude. Correspondingly, "if the injection characterization parameter meets the preset condition" means that the vibration amplitude sensed by the acquisition module 51 is greater than the preset vibration amplitude; alternatively, the preset condition may specifically be greater than a preset noise value, and correspondingly, "if the injection characterization parameter meets the preset condition" means that the noise value sensed by the acquisition module 51 is greater than the preset noise value.

[0068] Further, in the foregoing determination step, if the injection characterization parameter meets the preset condition, which corresponds to the situation where the vibration at the diameter-expanding position is severe or the noise is loud, the control module 52 controls the refrigeration system 100 to switch to the strong noise reduction mode. By allowing all the refrigerant to flow through the second capillary tube 32, the dryness is greatly reduced, thereby reducing the vibration and noise caused by the injection at the diameter-expanding position; on the contrary, if the injection characterization parameter does not meet the preset condition, which corresponds to the situation where the vibration at the diameter-expanding position is not severe or the noise is low, the control module 52 controls to continue maintaining the balance mode, so that the refrigeration system 100 operates with high refrigeration efficiency.

[0069] Further, when the refrigeration system 100 is in the balance mode for a continuous preset duration, the preset duration can preferably be any value within the range of 2min to 3min, the acquisition module 51 senses the current injection characterization parameter at the diameter-expanding position, and the control module 52 then determines whether the injection characterization parameter meets the preset condition and controls whether the opening and closing mechanism operates according to the determination result. That is, the refrigeration system 100 is first operated in the balance mode for the preset duration, so that after the operation of the entire refrigeration system 100 is stabilized, the injection characterization parameter is sensed and whether the vibration / noise is excessive is determined, thereby reducing the error caused by unstable operation when the refrigeration system 100 is just started, and making the sensing and control more accurate.

[0070] In this embodiment, the acquisition module 52 may specifically include one or more sensing elements. Preferably, the number of the sensing elements is set to two or more, and the average value of the sensing results of the two or more sensing elements is used as the injection characterization parameter, thereby improving the accuracy.

[0071] Reference Figure 2 , this embodiment also provides a control method for a refrigeration system, which is suitable for controlling the foregoing refrigeration system 100. The control method of this embodiment will be 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 applicable is not limited to the refrigeration system 100. The control method comprises:

[0072] When both the first path P1 and the second path P2 are turned on, the refrigerant of the condenser 20 is simultaneously distributed to the first capillary tube 31 and the second capillary tube 32, so that when part of the refrigerant flows through the first capillary tube 31, it exchanges heat with the return pipe 11 of the compressor 10, and when the other part of the refrigerant flows through the second capillary tube 32, it exchanges heat with the evaporator 40.

[0073] Sensing eruption characterization parameters at the expansion position, wherein the eruption characterization parameters are vibration amplitude or noise value;

[0074] Determine whether the eruption characterization parameters meet preset conditions, wherein the preset conditions are greater than a preset vibration amplitude or greater than a preset noise value;

[0075] If so, that is, if the vibration amplitude is greater than the preset vibration amplitude or the noise value is greater than the preset noise value, then control the second path P2 to be turned on and the first path P1 to be turned off. All the refrigerant in the condenser 20 is distributed to the second capillary tube 32 instead of the first capillary tube 31, so that all the refrigerant flows through the second capillary tube 32 to exchange heat with the evaporator 40 to reduce the refrigerant dryness at the expansion position, and further reduce vibration and noise.

[0076] If not, that is, if the vibration amplitude is not greater than the preset vibration amplitude or the noise value is not greater than the preset noise value, then both the first path P1 and the second path P2 remain connected.

[0077] Thus, as described above, by allowing a portion of the refrigerant to flow through the first capillary tube 31 to ensure refrigeration efficiency, while controlling a portion of the refrigerant to flow through the second capillary tube 32 to the evaporator 40, the refrigeration system 100 maintains low noise / vibration and high refrigeration efficiency. When the vibration or noise is large at the expanded diameter position, all the refrigerant is allowed to flow through the second capillary tube 32 to exchange heat with the evaporator 40, thereby reducing the dryness and ensuring low vibration / noise. Through these two changes in state, the refrigeration system 100 can achieve a balance and reasonable control between refrigeration efficiency and noise to adapt to the usage requirements under different conditions.

[0078] Preferably, the step "sensing the eruption characterization parameters at the expansion position" is as follows:

[0079] By controlling both the first path P1 and the second path P2 to be on, and maintaining this state for a preset duration (preferably any value within the range of 2-3 minutes), the current eruption characteristic parameters at the diameter expansion position are sensed. Then, the subsequent step of "determining whether the eruption characteristic parameters meet preset conditions" is executed, and the on / off state of the first path P1 and the second path P2 is controlled based on the determination result. This reduces errors caused by the instability of the cooling system 100 during initial startup, making sensing and control more accurate.

[0080] In this embodiment, the control method further comprises: when controlling the compressor 10 to start, first controlling both the first path P1 and the second path P2 to be conducted, and then switching to the strong noise reduction mode. In this way, it is firstly ensured that the refrigeration system 100 starts with high refrigeration efficiency, while maintaining low noise at an appropriate level, and then the mode is adjusted when the noise / vibration condition exceeds the standard, so that the temperature can be quickly lowered first, energy can be saved and consumption reduced, and the problem of low refrigeration efficiency caused by blind noise reduction under unnecessary circumstances can be avoided.

[0081] Refer Figure 3 to the partial structural schematic diagram of the refrigeration system according to the second embodiment of the present invention shown. The difference between this embodiment and the foregoing first embodiment lies only in the connection structure between the first common capillary tube 33 and the evaporator 40. Only this difference will be introduced below, and the rest is the same as the foregoing first embodiment, which will not be repeated here.

[0082] In this embodiment, the evaporator has a cylindrical tube 410 defining its inlet end 41 and a tube cavity 411 enclosed by the cylindrical tube 410; the outlet end of the first common capillary tube 33 and the transition tube 60 are both accommodated in the tube cavity 411 and are surrounded by the refrigerant in the tube cavity 411. Therefore, on one hand, the diameter-expanding position between the capillary mechanism and the evaporator is wrapped and covered, and the refrigerant jet noise in the transition tube 60 behind the first common capillary tube 33 is wrapped by the refrigerant in the tube cavity 411 to reduce leakage; on the other hand, the vibration caused by the jet can be counteracted by the refrigerant, so as to reduce the vibration noise caused by the outward transmission of vibration; on the other hand, the first common capillary tube 33 is wrapped in the tube cavity 411, so that when the refrigerant flows through the first common capillary tube 33, it can exchange heat with the refrigerant in the evaporator 40, thereby increasing the supercooling degree in the first common capillary tube 33, reducing the dryness of the refrigerant at the diameter-expanding position, and further eliminating the problem of jet noise / vibration.

[0083] Preferably, at least part of the transition tube 60 is provided as a porous tube 61 having a plurality of through holes 610, and the interior of the porous tube 61 is communicated with the tube cavity 411 via the through holes 610. In this way, when the refrigerant jets in the transition tube 60, large bubbles generated due to pressure reduction will be split into small bubbles when passing through the through holes 610, thereby reducing the noise generated by bubble rupture.

[0084] In this embodiment, part of the outlet end of the transition tube 60 is provided as the porous tube 61.

[0085] The cylindrical tube 410 is provided with a closed end face 412, the porous tube 61 is arranged coaxially with the cylindrical tube 410 and its end (that is, the end away from the first common capillary tube 33) abuts against the closed end face 412; the refrigerant in the tube cavity 411 is as Figure 3The arrow indicates that the refrigerant flows from the transition tube 60 to the first common capillary tube 33. That is, the refrigerant flow direction in the first common capillary tube 33 and the transition tube 60 is exactly opposite to the refrigerant flow direction in the cavity 411.

[0086] In addition, the center of the closed end face 412 has a flow-guiding protrusion 4120 extending towards the porous tube 61, and the closed end face 412 is arranged to extend outward in an arc shape from the flow-guiding protrusion 4120 to the cylindrical tube 410. This facilitates the smooth flow of refrigerant from the porous tube 61 into the tube cavity 411, avoiding turbulence, vibration or noise caused by violent collisions.

[0087] The third embodiment of the present invention also provides a refrigeration appliance, which may specifically be configured as a refrigerator, freezer, or other appliance with a low-temperature storage function. The refrigeration appliance further includes a refrigeration system as described in either the first or second embodiment.

[0088] In summary, the beneficial effects of the present invention are as follows: the refrigeration system 100 has a balanced mode and a strong noise reduction mode, which allows it to selectively maintain high refrigeration efficiency and low noise / vibration according to actual conditions, or to increase the subcooling of all refrigerant in the capillary mechanism by utilizing the cooling capacity of the evaporator 40, thereby greatly reducing the possibility of noise / vibration caused by ejection, achieving a balance and control between refrigeration efficiency and vibration reduction, so that the refrigeration system 100 can meet the usage requirements under different circumstances.

[0089] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0090] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A refrigeration system comprising a compressor, a condenser connected to the outlet end of the compressor, an evaporator connected to the return pipe of the compressor, and a capillary mechanism communicating between the condenser and the evaporator, characterized in that, The evaporator has a transition tube at its inlet end with an inner diameter larger than that of the capillary mechanism, and the transition tube connects the capillary mechanism and the evaporator; the evaporator has a cylindrical tube defining its inlet end and a cavity enclosed by the cylindrical tube. The outlet end of the capillary mechanism and the transition tube are both housed in the cavity and enclosed by the refrigerant in the cavity; the cylindrical tube is provided with a closed end face; at least a portion of the transition tube is configured as a porous tube with several through holes, the interior of the porous tube being connected to the cavity through the through holes; The capillary mechanism includes a first capillary tube and a second capillary tube arranged in parallel. The first capillary tube is attached to the return pipe of the compressor, and the second capillary tube is attached to the evaporator. The refrigeration system further includes an opening and closing mechanism, which includes a flow divider valve connected to the inlet end of the first capillary tube and the inlet end of the second capillary tube. The diverter valve can distribute the refrigerant at the condenser to the second capillary tube instead of the first capillary tube, or to both the first and second capillary tubes simultaneously.

2. The refrigeration system according to claim 1, characterized in that, The capillary mechanism includes a second common capillary tube, and the condenser is connected to the first capillary tube and the second capillary tube respectively through the second common capillary tube; The diverter valve is disposed between the second common capillary tube and the first capillary tube, and between the second common capillary tube and the second capillary tube.

3. The refrigeration system according to claim 1, characterized in that, The diversion valve is configured as a solenoid valve with one inlet and two outlets.

4. The refrigeration system according to claim 1, characterized in that, The opening and closing mechanism includes a confluence valve, which is connected to the outlet end of the first capillary and the outlet end of the second capillary. The confluence valve allows the evaporator to receive refrigerant from the second capillary tube instead of the first capillary tube, or to receive refrigerant from both the first and second capillary tubes simultaneously.

5. The refrigeration system according to claim 1, characterized in that, The capillary mechanism includes a first common capillary tube, and the first capillary tube and the second capillary tube are both connected to the evaporator sequentially via the first common capillary tube; The opening and closing mechanism includes a confluence valve, which is disposed between the first common capillary tube and the first capillary tube, and between the first common capillary tube and the second capillary tube.

6. The refrigeration system according to claim 4, characterized in that, The merging valve is configured as a two-inlet, one-outlet solenoid valve.

7. The refrigeration system according to claim 1, characterized in that, The capillary mechanism includes a first common capillary tube, and the first capillary tube and the second capillary tube are connected to the evaporator in sequence via the first common capillary tube and the transition tube. The outlet end of the first common capillary tube and the transition tube are both housed in the cavity.

8. The refrigeration system according to claim 1, characterized in that, The porous tube is coaxially arranged with the cylindrical tube and its end abuts against the closed end face; The center of the closed end face has a flow guide protrusion that protrudes toward the porous tube, and the closed end face is arranged to extend outward from the flow guide protrusion in an arc shape to the cylindrical tube.

9. The refrigeration system according to claim 1, characterized in that, Also includes: The acquisition module is configured to sense the eruption characterization parameters at the expansion position between the capillary mechanism and the evaporator, wherein the eruption characterization parameters are vibration amplitude or noise value. The control module connects the acquisition module and the opening / closing mechanism, and controls the opening / closing mechanism according to the eruption characterization parameters.

10. A refrigeration system comprising a compressor, a condenser connected to the outlet end of the compressor, an evaporator connected to the return pipe of the compressor, and a capillary mechanism communicating between the condenser and the evaporator, characterized in that, The evaporator has a transition tube at its inlet end with an inner diameter larger than that of the capillary mechanism, and the transition tube connects the capillary mechanism and the evaporator; the evaporator has a cylindrical tube defining its inlet end and a cavity enclosed by the cylindrical tube. The outlet end of the capillary mechanism and the transition tube are both housed in the cavity and enclosed by the refrigerant in the cavity; the cylindrical tube is provided with a closed end face; at least a portion of the transition tube is configured as a porous tube with several through holes, the interior of the porous tube being connected to the cavity through the through holes; The capillary mechanism includes a first capillary and a second capillary arranged in parallel, wherein the lowest ambient temperature of the first capillary is higher than that of the second capillary. The refrigeration system further includes an opening and closing mechanism, which includes a flow divider valve connected to the inlet end of the first capillary tube and the inlet end of the second capillary tube. The diverter valve can distribute the refrigerant at the condenser to the second capillary tube instead of the first capillary tube, or to both the first and second capillary tubes simultaneously.

11. A refrigeration appliance, characterized in that, The refrigeration appliance includes the refrigeration system according to any one of claims 1-10.

12. A control method for a refrigeration system according to any one of claims 1-10, characterized in that, include: The flow divider valve connects the condenser to both the first and second capillary tubes simultaneously. When the vibration amplitude at the expansion position between the evaporator and the capillary mechanism is greater than the preset vibration amplitude or the noise value is greater than the preset noise value, the control diversion valve connects the condenser to the second capillary tube but not to the first capillary tube.

13. The control method for the refrigeration system according to claim 12, characterized in that, Also includes: After the preset duration of "controlling the diversion valve to connect the condenser to both the first and second capillary tubes simultaneously" is maintained, the following action is executed: "when the vibration amplitude at the expansion position between the evaporator and the capillary mechanism is greater than the preset vibration amplitude or the noise value is greater than the preset noise value, control the diversion valve to connect the condenser to the second capillary tube but not to the first capillary tube".

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