CN105698465A - Refrigerating and freezing device - Google Patents

Abstract

The invention relates to a refrigerating and freezing device, comprising: a box body, which defines a refrigerating chamber and a freezing chamber, a cooling chamber for providing cooling airflow for the refrigerating chamber and the freezing chamber, and a refrigerating return air duct; and an evaporator disposed on The cooling chamber is configured to exchange heat with the air flow passing through it; the cooling chamber is located behind the freezing chamber and is separated from the freezing chamber by the rear cover of the freezing chamber. The refrigerating return air outlet of the chamber and the freezing chamber allows the return air from the freezing chamber to return to the cooling chamber; the bottom of the rear wall of the cooling chamber is provided with a refrigerating return air outlet communicating with the refrigerating return air duct; two refrigerating return air outlets extend laterally The projections in the vertical plane of the refrigerating room are respectively located on the lateral sides of the projection of the refrigerating return air outlet in the vertical plane, so that the return air from the refrigerating room flows to the middle area of the evaporator, and the return air from the freezing room flows to the evaporator respectively. the two end regions of the device.

Description

Freezer

technical field

The invention relates to refrigeration and freezing technology, in particular to a refrigeration and freezing device.

Background technique

Air-cooled refrigerators are popular because they hardly form frost on the inner wall of the cabinet. However, during the actual operation of the air-cooled refrigerator, not all locations of the air-cooled refrigerator have no frost formation, but the location where the frost is generated is transferred from the inner wall of the box to the surface of the evaporator of the refrigerator. Frosting on the surface of the evaporator will increase the flow resistance of the air flowing through the evaporator and the heat transfer resistance between the evaporator and the air, thereby affecting the cooling capacity of the air-cooled refrigerator. Therefore, periodic defrosting of the evaporator is required.

Currently, in the prior art, electric heating is usually used to defrost the evaporator. However, in the prior art, the return air from multiple storage compartments of the air-cooled refrigerator is generally blown independently to some areas of the evaporator, resulting in concentrated frost formation on the evaporator and a thicker frost layer. This will not only affect the defrosting effect of the evaporator, but also cause waste of heat generated by the heater. According to incomplete statistics from industry insiders, in the prior art, generally only 15% to 20% of the heat generated by the heater is effectively used to defrost the evaporator, and the remaining heat is basically used to heat the interior of the evaporator. Air flow, causing the temperature inside the entire air-cooled refrigerator to rise. When the evaporator is defrosted and the storage compartment is refrigerated again, it takes a long time to recover the temperature before defrosting, which increases the energy consumption of the air-cooled refrigerator.

Contents of the invention

An object of the present invention is to overcome at least one defect in the prior art and provide a refrigeration and freezing device with high defrosting efficiency.

Another object of the present invention is to improve the heat exchange efficiency of the evaporator of the refrigerating and freezing device.

Another object of the present invention is to improve the refrigeration capacity and effect of the refrigerator-freezer.

In order to achieve the above object, the present invention provides a refrigerating and freezing device, comprising:

The box body defines a refrigerator compartment and a freezer compartment arranged one above the other for storing articles, a cooling compartment for providing cooling airflow to the refrigerator compartment and the freezer compartment, and a cooling compartment for returning from the refrigerator compartment. a refrigerated air duct returning air to the cooling chamber; and

an evaporator disposed in the cooling chamber and configured to exchange heat with the airflow passing therethrough to cool the airflow; wherein

The cooling chamber is located at the back of the freezing chamber and is separated from the freezing chamber by the rear cover of the freezing chamber. a freezing return air outlet of the freezing chamber to allow return air from the freezing chamber to return to the cooling chamber;

The bottom of the rear wall of the cooling chamber is provided with a refrigerating return air outlet communicating with the refrigerating return air duct; and

The projections of the two refrigerating return air outlets in a horizontally extending vertical plane are respectively located on the lateral sides of the projection of the refrigerating return air outlet in the vertical plane, so that the return air from the refrigerating room flows to all The middle area of the evaporator is arranged so that the return air from the freezing compartment flows to the two end areas of the evaporator respectively.

Optionally, the refrigerated freezer also includes:

a heating device disposed in the cooling chamber and configured to heat and defrost the evaporator in a controlled manner; and

The return air guide nozzle is arranged between the air outlet of the refrigeration return air passage and the refrigeration return air outlet, and is configured to guide the return air in the refrigeration return air passage to the evaporator according to the set air path. The middle area of the evaporator is arranged so that the distribution of return air flowing through the middle area of the evaporator is consistent with the heat distribution corresponding to the middle area of the evaporator when the heating device defrosts the evaporator.

Optionally, at least two return air guide plates are arranged inside the return air guide nozzle, so as to divide the inner space of the return air guide nozzle into at least three return air guide channels; and

The position of at least two return air guide plates inside the return air guide nozzle is arranged so that the flow passes through the two lateral ends of the return air guide nozzle to the return air guide channel arranged in sequence in the middle thereof The return air volume inside increases successively.

Optionally, the number of the return air deflector is two; and

The two return air deflectors are arranged so that the cross-sectional area of the air inlets of the two end return air guide passages located at both lateral ends of the return air guide nozzle is the same as the cross-sectional area of the air inlets located at the two end return air guides. The ratio between the cross-sectional areas of the air inlets of a central return air guiding channel between the air guiding channels is any ratio between 1:1:2 and 1:1:4.

Optionally, the return air guide nozzle is configured to expand gradually along the flow direction of the air flow therein; and

The air outlet of the return air guide nozzle is connected to the refrigeration return air outlet, and the horizontal width of the refrigeration return air outlet is consistent with the lateral width of the air outlet of the return air guide nozzle.

Optionally, the sum of the lateral width of the refrigerating air return port and the lateral widths of the two freezing return air ports is equal to the lateral width of the evaporator.

Optionally, the upper end of each refrigerated air return port is located between the lower quarter of the evaporator and the lower third of the evaporator in the vertical direction.

Optionally, the two refrigerated air return ports are arranged symmetrically with respect to a vertical bisecting plane extending along the depth direction of the box.

Optionally, the refrigerated freezer also includes:

a blower arranged in the cooling chamber and positioned downstream of the evaporator in the direction of air flow in the cooling chamber to promote airflow between the refrigerating chamber and the cooling chamber, and between the freezing chamber and the cooling chamber circulating flow between said cooling chambers; and

The air supply nozzle is arranged between the evaporator and the fan, and is configured to guide the airflow after heat exchange through the evaporator to the fan according to a set air path.

Optionally, the air supply nozzle is configured to taper along the flow direction of the air flow therein; and

The lateral width of the air inlet adjacent to the evaporator of the air supply nozzle is consistent with the lateral width of the evaporator.

Since the humidity in the refrigerator is relatively high and the humidity in the freezer is relatively low, the return air from the refrigerator contains more moisture than the return air from the freezer and is more likely to form frost on the evaporator . Moreover, when the evaporator is heated and defrosted, most of the heat is concentrated in the central area of the evaporator. Therefore, in the refrigerating and freezing device of the present invention, the positions of the refrigerating return air outlet and the two refrigerating air return outlets along the lateral direction are set so that the projections of the two refrigerating air return outlets in the vertical plane extending in the transverse direction are respectively located at the positions of the refrigerating return air outlet. The horizontal sides of the projection in the vertical plane, so that the return air from the freezer and the return air from the refrigerator can blow to the evaporator from opposite sides (the freezing return air blows from the front lower part of the evaporator to evaporator, the refrigerated return air is blown from the rear lower part of the evaporator to the evaporator), the return air from the refrigerating room can flow to the middle area of the evaporator, and the return air from the freezing room can flow to the two end areas of the evaporator respectively , so that the frost on the evaporator is mainly concentrated in the middle area, so that the heat of the evaporator during defrosting can be fully and reasonably used, and the defrosting efficiency of the evaporator is improved.

Further, the refrigerating and freezing device of the present invention guides the return air with high humidity from the refrigerator compartment by setting the return air guide nozzle, so that the distribution of the return air flow through the central area of the evaporator and the heating device can control the evaporator. When heating and defrosting, the heat distribution corresponding to the middle area is consistent, so that the distribution of frost generated on the middle area of the evaporator is consistent with the heat distribution generated by the heating device in this area. In this way, not only can the frost condensation be prevented from being too thick in a local small area on the evaporator, thereby shortening the defrosting time of the evaporator and improving the defrosting efficiency of the evaporator, but also the heat generated by the heating device can be mainly used for cooling The evaporator performs defrosting, so that the heat generated by the heating device is used reasonably and effectively, thereby reducing the energy consumption of the refrigerating and freezing device.

Further, since the sum of the lateral width of the refrigerating return air outlet and the lateral widths of the two freezing return air outlets is equal to the lateral width of the evaporator. Therefore, the return air from the refrigerator compartment and the freezer compartment can flow through the evaporator relatively evenly, so that all areas of the evaporator in its entire width direction can exchange heat with the airflow, and the heat exchange efficiency of the evaporator is improved. At the same time, since the defrosting effect and the defrosting efficiency of the evaporator of the refrigerating and freezing device of the present invention are relatively high, the heat exchange efficiency of the evaporator is further improved.

Further, since the refrigerating and freezing device of the present invention also includes a fan and an air supply nozzle arranged between the fan and the evaporator, the airflow after heat exchange by the evaporator can be guided to the fan according to the set air path. , to avoid turbulent, turbulent or mixed flow in the local area between the fan and the evaporator, reduce the resistance during the flow of the airflow, and increase the flow speed of the airflow after heat exchange, thereby improving the refrigeration and freezing process. The cooling capacity and cooling effect of the device. At the same time, the present invention enables at least part of the return air to pass through the exchange of the evaporator according to the set air path through the mutual cooperation and cooperation of the air supply nozzle located downstream of the evaporator and the return air nozzle located upstream of the evaporator. The gap between the heat fins reduces the resistance of the airflow when it passes through the evaporator to a certain extent, and further improves the cooling capacity and effect of the refrigerating and freezing device.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural diagram of a refrigerating and freezing device according to one embodiment of the present invention;

Fig. 2 is a schematic front view of the refrigerator-freezer according to one embodiment of the present invention, with the door body and the components inside the cooling chamber hidden;

Fig. 3 is another schematic structural diagram of a refrigerating and freezing device according to an embodiment of the present invention;

Fig. 4 is a schematic heat distribution diagram when the heating device of the refrigerating and freezing device heats and defrosts the evaporator according to an embodiment of the present invention;

Fig. 5 is a schematic frosting distribution diagram of the evaporator of the refrigerating and freezing device according to one embodiment of the present invention;

Fig. 6 is a schematic distribution diagram of the return air volume flowing through the evaporator of the refrigerating and freezing device according to one embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a refrigerating return air passage of a refrigerating and freezing device according to an embodiment of the present invention.

detailed description

An embodiment of the present invention provides a refrigerator-freezer 1. FIG. 1 is a schematic structural diagram of a refrigerator-freezer according to an embodiment of the present invention. FIG. A schematic front view of the interior components (specifically, the evaporator 20 and the heating device 30 are hidden in FIG. 2, so as to observe the positional relationship between the two freezing air return ports 121, 122 and the refrigerating air return port 141), Fig. 3 is another schematic structural diagram of a refrigerating and freezing device according to an embodiment of the present invention, and the straight arrows shown in Fig. 3 indicate the flow direction of the airflow in the corresponding channel. Referring to Fig. 1 to Fig. 3, the refrigerating and freezing device 1 comprises: a casing 10, which defines a refrigerating chamber 11 and a freezing chamber 12 arranged up and down for storing articles, and is used to provide cooling airflow for the refrigerating chamber 11 and the freezing chamber 12. The cooling chamber 14, and the refrigerating return air channel 15 for returning the return air from the refrigerating chamber 11 to the cooling chamber 14; Exchange to cool the air flow. Specifically, the refrigerating room 11 is used to provide users with a refrigerating function, and the temperature therein is usually set at 4°C-7°C. The freezer compartment 12 can be located below the freezer compartment 11 and is used to provide users with functions such as quick freezing and freezing. The temperature in the freezer compartment 12 is usually set at -24°C to -4°C. The evaporator 20 has a plurality of heat exchange straight pipes 21 arranged at intervals and a plurality of U-shaped pipes 22 connecting the ends of two adjacent heat exchange straight pipes 21 in the same direction. The heat exchange straight pipes 21 and U-shaped pipes 22 communicate There is a heat exchange medium for exchanging heat with the gas flow. The heat exchange straight tube 21 is pierced with a plurality of heat exchange fins 23 arranged at intervals. When the air flow passes through the heat exchange gaps between the heat exchange fins 23, heat exchange occurs with the heat exchange fins 23, thereby changing the air flow. temperature to cool it down.

Further, the refrigerating and freezing device 1 may further include at least one door body, which is pivotally or pushably connected to the box body 10 . Specifically, the refrigerating and freezing device 1 includes a first door 81 for opening and/or closing the refrigerating compartment 11 and a second door 82 for opening and/or closing the freezing compartment 12 .

Particularly, the cooling chamber 14 is located at the back of the freezing chamber 12, and is separated from the freezing chamber 12 by the rear cover plate 123 of the freezing chamber 12, and the two sides of the bottom of the rear cover plate 123 are provided with openings communicating with the cooling chamber 14 and the freezing chamber 12 respectively. The refrigerated air return port 121 and the refrigerated air return port 122 allow return air from the freezing chamber 12 to return to the cooling chamber 14 . A refrigerating return air outlet 141 communicating with the refrigerating return air passage 15 is opened at the bottom of the rear wall of the cooling chamber 14 . That is to say, in the depth direction of the cabinet 10 , the refrigerating return air outlets 121 , 122 are located at the front side of the evaporator 20 , and the refrigerating air return opening 141 is located at the rear side of the evaporator 20 . The middle portion of the bottom of the rear cover 123 between two side ends abuts against the bottom wall of the liner of the freezing compartment 12 to prevent the return air from the freezing compartment 12 from blowing to the central area of the evaporator 20 .

Further, the projections of the two refrigerating return air outlets 121, 122 in the vertical plane extending laterally are respectively located on the lateral sides of the projection of the refrigerating return air outlet 141 in the vertical plane, so that the return air flow from the refrigerating room 11 To the central area of the evaporator 20, the return air from the freezing chamber 12 flows to the two end areas of the evaporator 20 respectively. That is to say, in the transverse direction, the two refrigeration return air outlets 121, 122 are respectively located on both sides of the refrigeration return air outlet 141, and the two refrigeration return air outlets 121, 122 and the refrigeration return air outlet 141 are in the vertical plane extending along the transverse direction. Projections do not overlap. The end region of the evaporator 20 means a region with a certain width and a regular or irregular shape adjacent to the two lateral edges thereof, and the middle region of the evaporator 20 means a region located between the two end regions of the evaporator 20 A region with a certain width between them.

Those skilled in the art can understand that, since the humidity in the refrigerator compartment 11 is relatively high and the humidity in the freezer compartment 12 is relatively low, the return air from the refrigerator compartment 11 contains more moisture than the return air from the freezer compartment 12. The greater the contained moisture, the easier it is to form frost on the evaporator 20 . Moreover, when the evaporator 20 is heated and defrosted, most of the heat is concentrated in the central region of the evaporator 20 . Therefore, in the refrigerating and freezing device 1 of the present invention, the positions of the refrigerating return air outlet 141 and the two freezing return air outlets 121, 122 in the lateral direction are set so that the two freezing return air outlets 121, 122 are within the horizontally extending vertical plane. The projections are respectively located on the lateral sides of the projection of the refrigerating return air outlet 141 in the vertical plane, so that the return air from the freezing compartment 12 and the return air from the refrigerating compartment 11 can be blown to the evaporator 20 from opposite sides ( The freezing return air blows to the evaporator 20 from the front lower part of the evaporator 20, the refrigerating return air blows to the evaporator 20 from the rear lower part of the evaporator 20), and the return air from the refrigerating room 11 can flow to the middle area of the evaporator 20 1. The return air from the freezing chamber 12 can flow to the two end regions of the evaporator 20 respectively, so that the frost on the evaporator 20 is mainly concentrated in the middle region, so that the heat of the evaporator 20 during defrosting can be fully and reasonably utilized , improving the defrosting efficiency of the evaporator 20.

In some embodiments of the present invention, the upper end of each refrigerated air return port is located between the lower quarter of the evaporator 20 and the lower third of the evaporator 20 in the vertical direction. That is to say, the upper ends of the freezing return air outlet 121 and the freezing return air outlet 122 are higher than the lower quarter of the evaporator 20 and lower than the lower third of the evaporator 20 . The lower quarter of the evaporator 20 means the position of the quarter horizontal bisector adjacent to its lower end of the evaporator 20. Similarly, the lower third of the evaporator 20 means the position of the evaporator 20 The position of the horizontal bisector of the third near its lower end. In this way, it is possible to avoid the problem that the cooling return air flow path is prolonged due to the too low height of the cooling return air opening and cannot effectively flow to the evaporator 20, and it is also possible to avoid the turbulence of the supply air flow and the return air flow caused by the high cooling air return opening height. , Incomplete return air heat exchange and other problems.

In some embodiments of the present invention, the two refrigeration return air outlets 121 , 122 are arranged symmetrically with respect to a vertical bisection plane extending along the depth direction of the cabinet 10 . That is to say, the positions of the two refrigerated air return ports 121 , 122 are symmetrical to each other, and the sizes of the two refrigerated air return ports 121 , 122 are the same, so that the amount of return air flowing to the two lateral end regions of the evaporator 20 is approximately the same.

In order to meet the overall load of the refrigerating chamber 11 and the freezing chamber 12 and the cooling capacity required by each compartment, in some embodiments of the present invention, the sum of the cross-sectional areas of the two refrigerating return air outlets 121, 122 is equal to that of the refrigerating return air outlet. The ratio of the cross-sectional area of 141 is roughly equal to the ratio of the cooling capacity of the freezing compartment 12 to the cooling capacity of the refrigerating compartment 11 . That is to say, the ratio of the cross-sectional area of the entire refrigerating return air outlet to the cross-sectional area of the entire refrigerating air return opening is the same as the ratio between the cooling capacity required by the freezing chamber and the refrigerating chamber. Thus, both the refrigerator compartment 11 and the freezer compartment 12 can achieve a normal cooling effect.

In some embodiments of the present invention, the refrigerating and freezing device 1 further includes: a heating device 30 disposed in the cooling chamber 14 and configured to heat and defrost the evaporator 20 in a controlled manner; and a return air guide nozzle 50, It is arranged between the air outlet of the refrigeration return air passage 15 and the refrigeration return air outlet 141, and is configured to guide the return air in the refrigeration return air passage 15 to the middle area of the evaporator 20 according to the set air path, so that it flows through The return air volume distribution in the central area of the evaporator 20 is consistent with the heat distribution corresponding to the central area of the evaporator 20 when the heating device 30 defrosts the evaporator 20 .

That is to say, the refrigerating and freezing device 1 of the present invention guides the return air with relatively high humidity from the refrigerator compartment 11 by setting the return air guide nozzle 50, so that the distribution of the return air volume flowing through the central area of the evaporator 20 and the heating When the device 30 heats and defrosts the evaporator 20, the distribution of heat generated in the middle area is consistent, so that the distribution of frost generated in the middle area of the evaporator 20 is consistent with the heat distribution generated by the heating device 30 in this area. In this way, not only can avoid the frost condensation in a local small area on the evaporator 20 being too thick, thereby shortening the defrosting time of the evaporator 20 and improving the defrosting efficiency of the evaporator 20, but also can make the heat generated by the heating device 30 It is mainly used to defrost the evaporator 20, so that the heat generated by the heating device 30 can be reasonably and effectively used, thereby reducing the energy consumption of the refrigerating and freezing device 1 .

Since the effective heat exchange area or the main heat exchange area of the evaporator 20 is the area where the heat exchange straight pipe 21 with the heat exchange fins 23 perforated is located, the heating device 30 in the embodiment of the present invention is generated on the evaporator 20. The heat distribution on the evaporator 20 and the frosting distribution on the evaporator 20 are all for the area of the evaporator 20 with the heat exchange fins 23 .

Those skilled in the art should understand that the type, layout, parameters (such as rated power) or other related settings of the heating device 30 are different, and the distribution of the heat generated when the evaporator 20 is heated and defrosted is also different. The air paths through which the nozzle 50 can guide the flow of return air are also different. That is to say, the configuration of the return air guide nozzle 50 in the embodiment of the present invention is based on the type selection, structure, position and setting parameters of the heating device 30 .

Fig. 4 is a schematic heat distribution diagram when the heating device of the refrigerating and freezing device according to one embodiment of the present invention heats and defrosts the evaporator, and Fig. 5 is a schematic structure of the evaporator of the refrigerating and freezing device according to one embodiment of the present invention Frost distribution diagram, FIG. 6 is a schematic distribution diagram of return air flowing through an evaporator of a refrigerating and freezing device according to an embodiment of the present invention. The designer of the present invention found that the heating device 30 used to defrost the evaporator 20 is usually arranged under the evaporator 20, specifically, in the embodiment of the present invention, the heating device 30 can be arranged under the evaporator 20 Electric heating devices, such as electric heating wire or electric heating tube, etc. At this time, the heat distribution when the heating device 30 heats and defrosts the evaporator 20 can be seen in FIG. The area surrounded by a horizontal line below the parabola (ie the area with hatching in FIG. 4 ). Overall, the distribution of the heat generated by the heating device 30 on the evaporator 20 is generally in a decreasing trend from the middle to both sides. Therefore, the frosting distribution on the evaporator 20 should also gradually decrease from the middle of the evaporator 20 to its both sides (the frosting distribution on the evaporator 20 is referred to the area with hatching in Fig. 5), for this reason, flow through the evaporator The distribution of the return air volume of the evaporator 20 should also decrease successively from the middle of the evaporator 20 to both sides thereof (see FIG. 6 ).

The designer of the present invention considers that the humidity of the return air from the refrigerating chamber 11 is relatively high, so it is necessary to guide the return air from the refrigerating return air duct 15 in particular. Fig. 7 is a schematic structural diagram of a refrigerating return air duct of a refrigerating and freezing device according to an embodiment of the present invention, and the straight arrows shown in Fig. 7 indicate the flow direction of the airflow in the corresponding air duct. The refrigerating return air channel of the refrigerating and freezing device 1 includes a refrigerating return air channel 15 and a return air guide nozzle 50 . At least two return air guide plates 51 are arranged inside the return air guide nozzle 50 to divide the inner space of the return air guide nozzle 50 into at least three return air guide channels. The position of at least two return air guide plates 51 inside the return air guide nozzle 50 is arranged such that the return air volume flowing through the two lateral ends of the return air guide nozzle 50 to the return air guide passages arranged in sequence in the middle is sequentially arranged. increment. That is to say, the return air volume in the return air guide channels arranged sequentially from the middle to both sides decreases successively, the return air volume in the return air guide channel located in the middle is the largest, and the return air volume in the return air guide channels located at both ends Return air volume is minimal. Specifically, the at least two return air guide plates 51 are arranged such that the cross-sectional areas of the inlets of the return air guide passages sequentially arranged from the middle to both sides decrease in order.

Further, in one embodiment of the present invention, there are two return air deflectors 51 . The two return air deflectors 51 are arranged so that the cross-sectional area of the air inlets of the two end return air guide passages 521, 523 located at the two lateral ends of the return air guide nozzle 50 is the same as the cross-sectional area of the air inlets located at the two end return air guides. The ratio of the cross-sectional area of the air inlet of a middle return air guiding channel 522 between the air channels 521 and 523 is any ratio between 1:1:2˜1:1:4. Thus, the distribution of the return air flowing through the central area of the evaporator 20 can be substantially consistent with the heat distribution generated by the heating device 30 corresponding to the central area of the evaporator 20 , and the structure of the return air guide nozzle 50 can be simplified. That is to say, the two end return air guide channels 521, 523 can be arranged symmetrically with respect to the middle return air guide channel 522, and the cross-sectional area of the air inlets of the two end return air guide channels 521, 523 is the same as The ratio between the cross-sectional areas of the air inlets of the central return air guiding channel 522 may be 1:1:2, 1:1:3 or 1:1:4. Preferably, in the embodiment of the present invention, the ratio between the cross-sectional area of the air inlets of the two end return air guide channels 521, 523 and the cross-sectional area of the air inlet of the middle return air guide channel 522 is 1 :1:3, thus, the distribution of the return air flowing through the middle area of the evaporator 20 can be made closest to the heat distribution generated by the heating device 30 corresponding to the middle area of the evaporator 20 .

In some embodiments of the present invention, the return air guide nozzle 50 is configured to diverge gradually along the flow direction of the air flow therein. That is to say, the cross-sectional area of the return air guide nozzle 50 gradually increases along the flow direction of the airflow therein, so the flow velocity of the airflow inside the return air guide nozzle 50 becomes smaller and smaller. In other words, the return air guide nozzle 50 can slow down the air flow to the evaporator 20 to a certain extent, so as to increase the contact time between the air flow and the evaporator 20 , thereby further improving the heat exchange effect of the evaporator 20 .

Further, the air outlet 53 of the return air guide nozzle 50 is connected to the refrigeration return air outlet 141, and the width of the refrigeration return air outlet 141 in the transverse direction is consistent with the width of the air outlet 53 of the return air guide nozzle 50 in the transverse direction, so that The return air guide nozzle 50 is seamlessly connected with the refrigeration return air outlet 141 .

Furthermore, the sum of the lateral width of the refrigerating air return port 141 and the lateral widths of the two freezing return air ports 121 , 122 is equal to the lateral width of the evaporator 20 . Thus, the return air from the refrigerating chamber 11 and the freezing chamber 12 can flow through the evaporator 20 relatively evenly, so that all regions of the evaporator 20 in its entire width direction can exchange heat with the airflow, improving the efficiency of the evaporator. 20 heat exchange efficiency. At the same time, since the defrosting effect and defrosting efficiency of the evaporator 20 of the refrigerating and freezing device 1 of the present invention are relatively high, the heat exchange efficiency of the evaporator 20 is further improved. The lateral width of the evaporator 20 refers to the width of the straight heat exchange pipe 21 of the evaporator 20 through which the heat exchange fins 23 are pierced, that is, the arrangement width of the heat exchange fins 23 . Further, the section of the return air guide nozzle 50 adjacent to the air outlet 53 can protrude forward in the depth direction of the box body 10, so as to minimize the gap between the air outlet 53 and the return air outlet 141 or realize the air outlet. 53 and the seamless connection between the air return port 141.

Those skilled in the art should understand that "the return air flows through the evaporator 20 relatively uniformly" in the embodiment of the present invention means that the return air passes through the width direction of the evaporator 20, that is, there is no evaporator 20 Some areas of the evaporator do not have return air passing through, thereby fully utilizing the entire heat exchange area of the evaporator 20, expanding the effective heat exchange area of the evaporator 20, and further improving the heat exchange efficiency of the evaporator 20.

Furthermore, the thickness of the return air guide nozzle 50 in the depth direction of the box body 10 is smaller than the thickness of the refrigerated air return channel 15 in the depth direction, so as to avoid the cross-sectional area of the air inlet of the return air guide nozzle 50 If it is too large, the velocity of the airflow entering the return air guide nozzle 50 will decrease sharply.

In some embodiments of the present invention, referring to FIG. 1 and FIG. 3 , the refrigerating and freezing device 1 further includes: a fan 70 disposed in the cooling chamber 14 and located downstream of the evaporator 20 in the direction of air flow in the cooling chamber 14 , to promote the circulation of airflow between the refrigerating chamber 11 and the cooling chamber 14, and between the freezing chamber 12 and the cooling chamber 14; The airflow after heat exchange by the evaporator 20 is guided to the fan 70 according to the set air path. Thus, the airflow after heat exchange by the evaporator 20 can be guided to the fan 70 according to the set air path, so as to avoid turbulent, turbulent or mixed flow of the airflow in the local area between the fan 70 and the evaporator 20, The resistance in the flow process of the airflow is reduced, and the flow velocity of the airflow after heat exchange is increased, thereby improving the refrigeration capacity and refrigeration effect of the refrigerating and freezing device 1 . At the same time, the present invention enables at least part of the air flow to pass through the evaporator according to the set air path through the mutual cooperation and cooperation of the air supply air guide nozzle 60 located downstream of the evaporator 20 and the return air guide nozzle 50 located upstream of the evaporator 20. The gap between the heat exchange fins 23 of the evaporator 20 reduces the resistance to a certain extent when the airflow passes through the evaporator 20, and further improves the cooling capacity and effect of the refrigerating and freezing device 1.

In some embodiments of the present invention, the air supply nozzle 60 is configured to taper along the flow direction of the air flow therein. That is to say, the cross-sectional area of the air-supply nozzle 60 gradually decreases along the direction of the air flow inside it, so the velocity of the airflow inside the air-supply nozzle 60 becomes larger and larger. In other words, the air supply nozzle 60 can accelerate the air flow to the fan 70 after heat exchange by the evaporator 20 to a certain extent, so as to send the air flow after heat exchange to the refrigerator compartment 11, the freezer compartment 12 or other storage rooms as soon as possible. room, thereby improving the cooling capacity and cooling effect of the refrigeration and freezing device 1.

Further, the lateral width of the air inlet adjacent to the evaporator 20 of the air supply nozzle 60 is consistent with the lateral width of the evaporator 20 . Thus, it can be ensured that almost all the airflow after heat exchange by the evaporator 20 is guided by the air supply nozzle 60 to flow to the fan 70, so as to avoid part of the airflow flowing to the outside of the air supply nozzle 60 to cause turbulence, mixed flow, etc. The speed of the air flow is further accelerated, and the cooling capacity and cooling effect of the refrigeration and freezing device 1 are improved.

Due to the setting of the return air guide nozzle 50, the closer to the middle of the evaporator 20, the larger the air flow is. Therefore, in order to guide the air flow after heat exchange through the evaporator 20 more smoothly, the flow resistance of the air flow should be reduced as much as possible. In some embodiments of the present invention, the inside of the air supply nozzle 60 is provided with at least two air supply guide plates 61, so as to divide the inner space of the air supply nozzle 60 into at least three air supply guide channels. . The positions of at least two air supply guide plates 61 inside the air supply guide nozzle 60 are arranged such that the air supply volume flowing through the lateral ends of the air supply guide nozzle 60 to the air supply guide passages arranged in sequence in the middle thereof Incremented sequentially. That is to say, the air supply volume in the air supply guide channels arranged sequentially from the middle to both sides decreases successively, the air supply volume in the air supply guide channel located in the middle is the largest, and the air supply guide channels located at both ends The air supply volume inside is minimum. Specifically, the at least two air supply guide plates are arranged such that the cross-sectional areas of the inlets of the air supply guide channels arranged sequentially from the middle to both sides decrease successively.

In some embodiments of the present invention, the number of air supply deflectors 61 may be two. The two air supply guide plates 61 are arranged so that the cross-sectional area of the air inlets of the two end air supply guide channels 621, 623 located at both ends is the same as the cross-sectional area of the air inlet between the two end air supply guide channels 621, 623. The ratio between the cross-sectional areas of the air inlets of one central air supply air guide channel 622 is any ratio between 1:1:2˜1:1:4. As a result, the distribution of the air flow that just flows out of the evaporator 20 can be kept as consistent as possible with the distribution of the air flow that flows through the evaporator 20, so as to reduce the air flow resistance and guide the air flow smoothly, and also simplify the installation of the air supply nozzle 60 structure. That is to say, the two end air supply guide channels 621, 623 can be arranged symmetrically with respect to the middle air supply guide channel 622, and the cross-sectional areas of the air inlets of the two end air supply guide channels 621, 623 are the same as The ratio between the cross-sectional areas of the air inlets of the central air supply air guide channel 622 may be 1:1:2, 1:1:3 or 1:1:4. Preferably, in the embodiment of the present invention, the ratio between the cross-sectional area of the air inlets of the two end air supply guide channels 621, 623 and the cross-sectional area of the air inlet of the middle air supply guide channel 622 is 1 :1:3, thus, the flow distribution of the air flowing out of the evaporator 20 is closest to the distribution of the air flow flowing through the evaporator 20.

In other embodiments of the present invention, the number of return air deflectors 51 and air supply deflectors 61 can also be three or more, so as to finely adjust the return air guide channel and the air supply air guide channel. Division, so as to more precisely control the distribution or allocation of air flow.

In other embodiments of the present invention, each refrigerating air return port can also be provided with a return air guide nozzle accordingly, so as to accurately guide the return air from the freezing chamber 12, so that the air flowing through the evaporator 20 The overall flow distribution is roughly consistent with the heat distribution generated by the heating device 30 corresponding to the overall area where the evaporator 20 is located.

Those skilled in the art should understand that the refrigerating and freezing device 1 in the embodiment of the present invention includes but is not limited to refrigerators, freezers, bar counters, refrigerators, etc., and also includes other devices that can provide functions such as refrigerating, changing temperature, and keeping fresh.

Those skilled in the art should also understand that "upper", "lower", "inner", "outer", "front", "back", "horizontal", "vertical" and the like referred to in the embodiments of the present invention are used for The terms expressing orientation or positional relationship are based on the actual use state of the refrigerating and freezing device 1. These terms are only for the convenience of describing and understanding the technical solution of the present invention, rather than indicating or implying that the referred device or parts must be Having a particular orientation, being constructed and operating in a particular orientation, and therefore not to be construed as limiting the invention.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. a refrigerating device, including:

Casing, defines in it for storing article and the cold room arranged up and down and refrigerating chamber, for providing the cooling room of cooling air-flow for described cold room and described refrigerating chamber and for being back to the cold preservation air-return duct of described cooling room for the return air from described cold room；And

Vaporizer, is arranged at described cooling indoor, and is configured to carry out heat exchange with the air-flow flowing through it, to cool down described air-flow；Wherein

Described cooling room is positioned at after described refrigerating chamber, and be separated by by the back shroud of described refrigerating chamber and described refrigerating chamber, the two bottom sides end of described back shroud offers the freezing return air inlet connecting described cooling room and described refrigerating chamber respectively, to allow the return air from described refrigerating chamber to be back to described cooling room；

The cold preservation return air inlet connected with described cold preservation air-return duct is offered bottom the rear wall of described cooling room；And

Two described freezing return air inlet projections in the perpendicular extended transversely lay respectively at the both lateral sides of described cold preservation return air inlet projection in this perpendicular, so that the return air from described cold room flows to the central region of described vaporizer, makes the return air from described refrigerating chamber flow to two end regions of described vaporizer respectively。

2. refrigerating device according to claim 1, also includes:

Heater, is arranged at described cooling indoor, and is configured to described vaporizer is controllably heated defrosting；And

Return air wind-guiding mouth, it is arranged between the air outlet of described cold preservation air-return duct and described cold preservation return air inlet, and be configured to according to the wind path set, the return air in described cold preservation air-return duct is guided the central region to described vaporizer, so that the heat produced by the central region of corresponding described vaporizer when described vaporizer is defrosted by air volume adjustment with described heater that returns flowing through described vaporizer central region is distributed consistent。

3. refrigerating device according to claim 2, wherein,

Described return air wind-guiding mouth be internally provided with at least two return air wind deflector, be divided at least three return air air-guiding aisle with the inner space by described return air wind-guiding mouth；And

Return air wind deflector described at least two the location arrangements within described return air wind-guiding mouth become to pass through the transverse ends by described return air wind-guiding mouth wherein between return air amount in the described return air air-guiding aisle that is arranged in order be incremented by successively。

4. refrigerating device according to claim 3, wherein,

The quantity of described return air wind deflector is two；And

The ratio that two described return air wind deflectors are arranged so that between the cross-sectional area of the air inlet of the cross-sectional area of the air inlet of two end return air air-guiding aisles of the transverse ends at described return air wind-guiding mouth and a middle part return air air-guiding aisle between two described end return air air-guiding aisles is the arbitrary ratio between 1:1:2～1:1:4。

5. refrigerating device according to claim 2, wherein,

Described return air wind-guiding mouth is configured to along its interior air current flow direction flaring；And

The air outlet of described return air wind-guiding mouth is connected with described cold preservation return air inlet, and the width that described cold preservation return air inlet is in the horizontal is consistent with the air outlet of described return air wind-guiding mouth width in the horizontal。

6. refrigerating device according to claim 5, wherein,

Described cold preservation return air inlet width in the horizontal and two described freezing return air inlet width sums in the horizontal are equal to described vaporizer width in the horizontal。

7. refrigerating device according to claim 1, wherein,

The upper end in the vertical direction of each described freezing return air inlet is respectively positioned between lower 1/4th of described vaporizer and lower 1/3rd of described vaporizer。

8. refrigerating device according to claim 1, wherein,

Two described freezing return air inlets are arranged about the vertical decile plane symmetry extended along its depth direction of described casing。

9. refrigerating device according to claim 1, also includes:

Blower fan, is arranged at described cooling indoor and is positioned at the downstream of described vaporizer on the air current flow direction that described cooling is indoor, to promote air-flow to circulate between described cold room and described cooling room and between described refrigerating chamber and described cooling room；And

Air-supply wind-guiding mouth, is arranged between described vaporizer and described blower fan, and is configured to guide to described blower fan the air-flow after described evaporator heat exchange according to the wind path set。

10. refrigerating device according to claim 9, wherein,

Described air-supply wind-guiding mouth is configured to along its interior air current flow direction convergent；And

The air inlet of the described vaporizer of vicinity of described air-supply wind-guiding mouth width in the horizontal is consistent with described vaporizer width in the horizontal。