CN107314604B

CN107314604B - Air circulation system of air-cooled refrigerator and air-cooled refrigerator

Info

Publication number: CN107314604B
Application number: CN201710432946.9A
Authority: CN
Inventors: 陈庆涛; 韩丽丽; 孙宝庆; 杨大海; 李智宝
Original assignee: Haixin (shandong) Refrigerator Co Ltd
Current assignee: Haixin (shandong) Refrigerator Co Ltd
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2020-03-31
Anticipated expiration: 2037-06-09
Also published as: CN107314604A

Abstract

The invention discloses an air circulation system of an air-cooled refrigerator and the air-cooled refrigerator, relates to the technical field of refrigerators, and aims to solve the problem that an air return system of the existing air-cooled refrigerator is low in air return efficiency. The invention provides an air circulation system of an air-cooled refrigerator, which comprises an air duct and an evaporator bin which are communicated with each other, wherein a fan is arranged in the air duct, an evaporator is arranged in the evaporator bin, the width of the evaporator is gradually reduced along the flowing direction of air in the evaporator bin, and the width of the evaporator bin is matched with the width of the evaporator. The invention can be used for refrigerators.

Description

Air circulation system of air-cooled refrigerator and air-cooled refrigerator

Technical Field

The invention relates to the technical field of refrigerators, in particular to an air circulation system of an air-cooled refrigerator and the air-cooled refrigerator.

Background

With the popularization and application of air-cooled refrigerators, the noise problem of the air-cooled refrigerators is more and more prominent, especially the noise problem of air ducts. In the factors influencing the noise of the air duct of the air-cooled refrigerator, besides the volute structure of the fan, the rotation speed of the fan is the most important, and the lower the rotation speed of the fan is, the smaller the noise of the air duct is, and vice versa. However, the noise of the air duct is reduced by reducing the rotation speed of the fan, which may cause the air output of the air duct to be reduced, and in order not to affect the air output of the air duct, the air output efficiency of the air duct needs to be improved (the higher the air output efficiency is, the larger the air output is, when the rotation speed of the fan is fixed), so that the rotation speed of the fan can be reduced when the air output of the air duct is fixed, thereby reducing the noise of the air duct. Therefore, the method for reducing the rotating speed of the fan by improving the air outlet efficiency of the air duct is the most effective method for solving the noise of the air duct in the industry. There are many ways to improve the air outlet efficiency of the air duct, and besides improving the air outlet efficiency of the air duct by optimizing the volute structure of the air duct to reduce the resistance of the air duct, the air outlet efficiency of the air duct can be improved by improving the air return efficiency of an air return system (the air return system is located in front of the air duct inlet and is communicated with the air duct, and the air return system refers to an evaporator bin and an evaporator in this document). The shape of the evaporator and the arrangement mode between the evaporator and the fan are the key points for improving the return air efficiency of the return air system.

In the structure of an evaporator and a fan in a traditional air-cooled refrigerator, as shown in fig. 1 and 2, the evaporator 01 is rectangular, the fan 02 is arranged above the evaporator 01, the fan 02 and the evaporator 01 are both positioned in a circulating air duct of the air-cooled refrigerator, air is sucked into the evaporator 01 by suction force generated when the fan 02 works, and after heat exchange is carried out by the evaporator 01, the air flows out of the upper surface of the evaporator 01 and enters the fan 02. In the structure, because the width of the evaporator 01 is far greater than that of the fan 02, wind flows out from the air outlet side of the evaporator 01 and then is dispersed, and because the suction force of the fan 02 is applied to the gas in a large area, the extraction efficiency of the fan 02 to the wind is low, so that the suction flow of the fan 02 is low, and the air return efficiency of an air return system is reduced.

In order to solve the above problems, the prior art provides a structure of an evaporator and a fan of an air-cooled refrigerator, as shown in fig. 3, that is, on the basis of the structure shown in fig. 2, a collecting cover 03 is covered on an air outlet surface of an evaporator 01, and a width of an outlet of the collecting cover 03 is adapted to a width of a fan 02.

However, in the evaporator and fan structure in the prior art, although the collecting hood 03 can collect the outlet air of the evaporator 01 to facilitate the extraction of the fan 02, the distance between the evaporator 01 and the fan 02 is usually not too large (the distance is larger, the fan 02 draws less air), and in the limited distance between the evaporator 01 and the fan 02, the width of the outlet of the collecting hood 03 is adapted to the width of the fan 02, so the rate of reduction of the width of the collecting hood 03 is relatively large (i.e. the width of reduction of the ventilation surface of the collecting hood 03 is relatively large), so that the air flows out from the outlet air surface of the evaporator 01 and enters the collecting hood 03, the ventilation surface suddenly reduces to cause loss of wind pressure and wind speed, and the reduction of the wind speed causes reduction of the return efficiency of the return air system. The reduction of the air return efficiency of the air return system not only can cause the reduction of the air outlet efficiency of the air duct and is not beneficial to reducing the noise of the air duct, but also can reduce the air quantity passing through the evaporator 01 and is not beneficial to improving the heat exchange efficiency of the evaporator 01; in addition, the addition of a collecting cover 03 between the fan 02 and the evaporator 01 increases the manufacturing cost.

Disclosure of Invention

The embodiment of the invention provides an air circulation system of an air-cooled refrigerator and the air-cooled refrigerator, which can improve the air return efficiency of an air return system and further improve the air outlet efficiency of an air duct.

In order to achieve the above object, an embodiment of the present invention provides an air circulation system of an air-cooled refrigerator, including an air duct and an evaporator bin which are communicated with each other, wherein a fan is disposed in the air duct, an evaporator is disposed in the evaporator bin, a width of the evaporator is gradually reduced along a flowing direction of air in the evaporator bin, and a width of the evaporator bin is adapted to a width of the evaporator.

According to the air circulation system of the air-cooled refrigerator provided by the embodiment of the invention, the width of the evaporator is gradually reduced along the flowing direction of air in the evaporator bin, so that the ventilation area of the evaporator is gradually reduced rather than suddenly reduced, and when the fan works, the loss of air pressure and air speed caused by suddenly reduced ventilation area can be avoided, the air quantity from the evaporator can be favorably improved, and the air return efficiency of the air return system can be improved. The improvement of the air return efficiency of the air return system not only can improve the air outlet efficiency of the air duct and is beneficial to reducing the noise of the air duct, but also is beneficial to improving the heat exchange efficiency of the evaporator; meanwhile, the structure of the evaporator can play a role in collecting wind, so that the cost of a collecting cover can be saved, and the manufacturing cost of the air-cooled refrigerator can be reduced; because the width of the evaporator bin is adapted to the width of the evaporator, gaps between the evaporator and the evaporator bin can be eliminated or greatly reduced, and the reduction of the heat exchange efficiency of the evaporator caused by the fact that wind flows away from the gaps between the evaporator and the evaporator bin is avoided.

On the other hand, the embodiment of the invention also provides an air-cooled refrigerator which comprises the air circulation system in the embodiment.

Since the air circulation system used in the air-cooled refrigerator in the embodiment of the present invention is the same as the air circulation system of the air-cooled refrigerator in the above-described embodiment, the two systems can solve the same technical problems and achieve the same expected effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a side view of a fan and evaporator structure in a conventional air-cooled refrigerator;

FIG. 2 is a front view of a fan and evaporator structure in a conventional air-cooled refrigerator;

FIG. 3 is a schematic diagram of a fan and evaporator arrangement in an air-cooled refrigerator according to the prior art;

FIG. 4 is a schematic diagram of the evaporator and the fan of the air circulation system of the air-cooled refrigerator according to the embodiment of the present invention;

FIG. 5 is a schematic view showing the shape of an evaporator according to an embodiment of the present invention;

FIG. 6 is a schematic view showing another shape of an evaporator according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of an air circulation system of the air-cooled refrigerator according to an embodiment of the present invention (the first air return opening and the second air return opening are disposed at two sides of the evaporator compartment along the width direction; the dashed line frame is the outline of the refrigerator housing);

FIG. 8 is a schematic structural view of an air circulation system of an air-cooled refrigerator according to an embodiment of the present invention (the first air return opening and the second air return opening are disposed at two sides of the evaporator chamber along the thickness direction);

FIG. 9 is a sectional view A-A of FIG. 7 (the dashed box is the outline of the refrigerator case);

FIG. 10 is an enlarged view of a portion of FIG. 9;

FIG. 11 is a schematic three-dimensional structure of an air circulation system of an air-cooled refrigerator according to an embodiment of the present invention;

FIG. 12 is an exploded view of an assembly structure of an air circulation system of an air-cooled refrigerator according to an embodiment of the present invention;

FIG. 13 is an exploded view of an assembled configuration of an air chute cover in an embodiment of the invention;

FIG. 14 is a schematic structural view of a rear cover plate of an air duct according to an embodiment of the present invention;

FIG. 15 is a cross-sectional view B-B of the rear cover plate of the air chute of FIG. 14;

FIG. 16 is a front view of an air deflector ring in accordance with an embodiment of the present invention;

FIG. 17 is a cross-sectional view C-C of FIG. 16;

FIG. 18 is a sectional view B-B of the duct back cover of FIG. 14 (with fan attached);

FIG. 19 is a wind field simulated cloud view of a wind turbine;

fig. 20 is a schematic view of another connection structure of the wind-guiding ring and the rear cover plate of the wind channel (both are integrally formed).

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 4 and 9, an embodiment of the present invention provides an air circulation system of an air-cooled refrigerator, including an air duct 1 and an evaporator bin 2 that are communicated with each other, a fan 3 is disposed in the air duct 1, an evaporator 4 is disposed in the evaporator bin 2, a width of the evaporator 4 is gradually reduced along a flow direction (an X direction shown in fig. 4) of air in the evaporator bin 2, and a width of the evaporator bin 2 is adapted to a width of the evaporator 4.

The width of the evaporator bin 2 and the width of the evaporator 4 refer to the size of the evaporator bin 2 and the size of the evaporator 4 in the direction perpendicular to the flowing direction of wind in the evaporator bin 2 (i.e. the Y direction shown in fig. 4); the width of the evaporator bin 2 is adapted to the width of the evaporator 4, which means that the width of the evaporator bin 2 is also gradually reduced along the flow direction of the wind inside the evaporator bin 2, and the difference between the width of the evaporator bin 2 and the width of the evaporator 4 is equal to or similar to each other in each section (for example, the section R-R, S-S, T-T in fig. 4) perpendicular to the flow direction of the wind inside the evaporator bin 2.

According to the air circulation system of the air-cooled refrigerator provided by the embodiment of the invention, the width of the evaporator 4 is gradually reduced along the flowing direction of the air in the evaporator bin 2, so that the ventilation area of the evaporator 4 is gradually reduced rather than suddenly reduced, and when the fan 3 works, the loss of air pressure and air speed caused by suddenly reduced ventilation area can be avoided, the air quantity from the evaporator 4 can be favorably improved, and the air return efficiency of an air return system can be improved. The improvement of the air return efficiency of the air return system not only can improve the air outlet efficiency of the air duct 1 and is beneficial to reducing the noise of the air duct 1, but also is beneficial to improving the heat exchange efficiency of the evaporator 4; meanwhile, the structure of the evaporator 4 can play a role in collecting wind, so that the cost of a collecting cover can be saved, and the manufacturing cost of the air-cooled refrigerator can be reduced; because the width of the evaporator bin 2 is adapted to the width of the evaporator 4, gaps generated between the evaporator 4 and the evaporator bin 2 can be eliminated or greatly reduced, and the reduction of the heat exchange efficiency of the evaporator 4 caused by the fact that wind flows away from the gaps between the evaporator 4 and the evaporator bin 2 is avoided.

The positional relationship between the fan 3 and the evaporator 4 is not unique, for example, the fan 3 may be located on the air inlet side of the evaporator 4, and when the fan 3 starts to operate, the fan 3 sends air to the air inlet side of the evaporator 4.

In addition, as shown in fig. 4, the fan 3 may be located on the air outlet side of the evaporator 4. Compare the side of intaking that is located evaporimeter 4, when fan 3 is located the air-out side of evaporimeter 4, fan 3 is to extracting the wind of the air-out side of evaporimeter 4, then form the negative pressure in this department, the negative pressure region can be filled to the wind of the side of intaking of evaporimeter 4, this kind of mode makes the wind through evaporimeter 4 more even to be favorable to improving the heat exchange efficiency of evaporimeter 4 (when fan 3 is located evaporimeter 4 side of intaking, the wind that fan 3 was thrown away is difficult to evenly get into in evaporimeter 4).

Referring to fig. 4, when the fan 3 is located on the air outlet side of the evaporator 4, since the width of the evaporator 4 is gradually reduced along the flowing direction of the air in the evaporator bin 2, it can be avoided that when the evaporator 4 is rectangular, two corners of the evaporator 4 near the air outlet side have low-speed vortex regions (i.e. the R, S region shown in fig. 2, which has low air pressure and low air speed), so that the air more uniformly passes through the whole evaporator 4, and the waste of the cooling capacity of the evaporator 4 can be avoided; simultaneously, evaporimeter 4 plays the mass flow effect to wind, can avoid wind to flow out and excessively disperse behind evaporimeter 4, is favorable to fan 4 to the extraction of wind, is favorable to improving the air output of fan to can improve the air-out efficiency of fan 3, and then can improve the air-out efficiency in wind channel.

Referring to fig. 4, the width of the air-out side of the evaporator 4 is n and the diameter of the fan 3 is d. Wherein, the value of n should not be too large, nor too small. If the value of n is too large, the flow collecting effect of the evaporator 4 on the wind is weakened, and the wind is relatively dispersed when flowing out of the evaporator 4, so that the wind is not easy to be sucked by the fan 3, and the air return efficiency of an air return system is not easy to be obviously improved; if the value of n is too small, the area of the air outlet side of the evaporator 4 is relatively small, the outflow of air at the air outlet side of the evaporator 4 is easily influenced, and the significant improvement of the air return efficiency of the air return system is also not facilitated. In order to effectively improve the air return efficiency of the air return system, n and d satisfy: d is more than n and less than 1.2 d. Improve the mass flow effect of evaporimeter 4 to wind so better, avoid the air-out side outflow of evaporimeter 4 to cross in the dispersion, be favorable to improving the amount of wind that fan 3 inhaled to can improve return air system's return air efficiency, and then can improve the air-out efficiency in wind channel 1.

The shape of the evaporator 4 is not exclusive, and for example, the evaporator 4 may have a shape as shown in fig. 6, and the left and right sides of the evaporator 4 are curved sides. As shown in fig. 5, the evaporator 4 may be trapezoidal, and the upper bottom of the trapezoidal shape is the air outlet side of the evaporator 4. When the evaporator 4 has a trapezoidal shape, the side plates 41 on both sides are straight, rather than arc-shaped, as compared with the shape shown in fig. 6, which facilitates the manufacture of the side plates 41 and contributes to the reduction of the manufacturing cost of the evaporator 4.

The type of evaporator 4 is not exclusive, and for example, the evaporator 4 may be a plate evaporator, and the evaporator 4 may be a fin-and-tube evaporator. Compare plate-type evaporator, the cooling rate of tube fin evaporator to the wind is great relatively, and the heat transfer homogeneity of tube fin evaporator and wind is better, consequently, heat exchange efficiency with the wind is better when evaporimeter 4 is tube fin evaporator.

In the air circulation system of the air-cooled refrigerator according to the embodiment of the present invention, the evaporator compartment 2 is provided with the first air return opening 11 and the second air return opening 12, wherein the opening positions of the first air return opening 11 and the second air return opening 12 are not unique, for example, as shown in fig. 8, the first air return opening 11 and the second air return opening 12 may be respectively provided at two ends of the evaporator compartment 2 along the thickness direction (i.e., the X direction in fig. 8). In addition, as shown in fig. 7 and 9, the first return air opening 11 and the second return air opening 12 may be opened at both ends of the evaporator compartment 2 in the width direction (i.e., the Y direction in fig. 7). Compare two return air inlets and offer the scheme at the both ends of 2 edge thickness directions in evaporimeter storehouse respectively, offer the scheme at the both ends of 2 edge width directions in evaporimeter storehouse at first return air inlet 11 and second return air inlet 12 respectively, because the width in evaporimeter storehouse 2 will be far more than thickness, distance between two return air inlets is just so far relatively, the return air that blows out from two return air inlets is difficult to the offset, loss wind pressure and wind speed when just can avoiding two strands of return air offsets, the amount of wind through evaporimeter 4 has been improved, thereby can further improve return air system's return air efficiency, and then can further improve the air-out efficiency in wind channel 1.

Further, the orientations of the first air return opening 11 and the second air return opening 12 are also not unique, for example, the orientations of the first air return opening 11 and the second air return opening 12 may be both horizontally arranged. In addition, as shown in fig. 7, the ends of the first air return opening 11 and the second air return opening 12 close to the inside of the evaporator bin 2 may also be arranged obliquely upward, that is, both air return openings are arranged obliquely upward. Compare the equal level setting of orientation of two return air inlets, two return air inlets all set up towards oblique top, are favorable to wind flow direction evaporimeter 4 more in, can avoid wind to turn to the loss of wind pressure, the wind speed that causes, are favorable to improving the amount of wind that gets into in the evaporimeter 4 to can improve the return air efficiency of return air system, and then can improve the air-out efficiency in wind channel 1.

In the air circulation system of the air-cooled refrigerator provided by the embodiment of the invention, the first air return opening 11 and the second air return opening 12 can be respectively communicated with corresponding chambers of the air-cooled refrigerator, namely, the first air return opening 11 is communicated with one chamber of the air-cooled refrigerator, and the second air return opening 12 is communicated with the other chamber of the air-cooled refrigerator. In order to meet the requirements of users for placing different foods, the number of compartments with different temperature areas of the existing air-cooled refrigerator is increased, generally three compartments are provided, two air return openings can only meet the air return of two compartments, and in order to meet the air return requirement of the air-cooled refrigerator with three compartments, as shown in fig. 7 and 9, the air circulation system of the air-cooled refrigerator provided by the embodiment of the invention further comprises a third air return opening 13, wherein the third air return opening 13 is arranged at the lower end of the evaporator bin 2, and the third air return opening 13 supplies air upwards. The third air return opening 13 can supply air upwards vertically or obliquely. Because the third return air inlet 13 supplies air upwards, the loss of air pressure and air speed caused by the air hedging with the air sent out from the first return air inlet 11 and the second return air inlet 12 can be avoided, the air quantity entering the evaporator 4 can be improved, the return air efficiency of a return air system can be improved, and the air outlet efficiency of the air channel 1 can be improved. The air circulation system of the air-cooled refrigerator provided by the embodiment of the invention is provided with the third air return opening 13 on the basis of the first air return opening 11 and the second air return opening 12, so that the air return requirement of the air-cooled refrigerator with three compartments can be met.

Referring to fig. 7, 9 and 12, the air-cooled refrigerator includes a refrigerating chamber 5, a temperature-variable chamber 6 and a freezing chamber 7 which are sequentially arranged from top to bottom, an evaporator compartment 2 is provided at the rear of the freezing chamber 7, wind generated by a fan 3 enters the three compartments, and then the wind in the three compartments enters the evaporator compartment 2 through a first return air inlet 11, a second return air inlet 12 and a third return air inlet 13, thereby completing wind circulation. Since the refrigerating chamber 5 and the temperature-variable chamber 6 are located above each other, as shown in fig. 11 and 12, a refrigerating air supply pipe c is connected between the refrigerating chamber 5 and the air supply port g, a temperature-variable air supply pipe d is connected between the temperature-variable chamber 6 and the air supply port g, and air generated by the fan 3 can be directly supplied to the freezing chamber 7 through the outlet of the freezing chamber.

The connection relationship between the three compartments of the air-cooled refrigerator and the three air return inlets is not unique, and for example, the three compartments of the air-cooled refrigerator and the three air return inlets can be connected in the following way: the first return air opening 11 is used for communicating with the freezing chamber 7, the second return air opening 12 is used for communicating with the refrigerating chamber 5, and the third return air opening 13 is used for communicating with the temperature-changing chamber 6.

In addition, the three compartments and the three air returns of the air-cooled refrigerator can be connected in the following way: as shown in fig. 7 and 9, the first return air opening 11 is for communicating with the refrigerating compartment 5, the second return air opening 12 is for communicating with the variable temperature compartment 6, and the third return air opening 13 is for communicating with the freezing compartment 7. The first air return opening 11 is communicated with the refrigerating chamber 5 through a refrigerating air return pipe a, the second air return opening 12 is communicated with the temperature-changing chamber 6 through a temperature-changing air return pipe b, and the first air return opening 11 and the second air return opening 12 enable the opening value to be on the inner container of the freezing chamber 7 corresponding to the evaporator bin 2. Compared with the connection mode described in the former, in the connection mode shown in fig. 7 and 9, because the freezing chamber 7 is located at the lowest part of the air-cooled refrigerator, and the third air return opening 13 is used for being communicated with the freezing chamber 7, the air return path of the freezing chamber 7 is favorably shortened, so that the energy loss of air in the air return process can be reduced, and the air return efficiency of the freezing chamber 7 is favorably improved.

Referring to fig. 12, 13 and 14, the air duct 1 includes an air duct front cover plate 14 and an air duct rear cover plate 15, an air inlet 151 is further formed in the air duct rear cover plate 15, the evaporator bin 2 is formed on one side of the air duct rear cover plate 15, which is far away from the air duct front cover plate 14, the air inlet 151 is located above the evaporator bin 2, the fan 3 is located inside the air inlet 151, an air guide ring 16 is connected to the air inlet 151, and the air guide ring 16 is used for guiding air flowing out of the evaporator bin 2 into the air inlet 151.

Wherein, the air supply outlet can be arranged on the upper end surface of the air duct rear cover plate 15; a third air return opening 13 is formed in a gap between the air duct front cover plate 14 and the inner container of the freezing chamber 7; as shown in fig. 10, the rear cover 15 of the air duct is connected to the rear wall of the inner container of the freezing chamber 7, and the cavity f of the rear cover 15 of the air duct is in sealing butt joint with the cavity e of the rear wall of the inner container of the freezing chamber 7 (the gap between the two is sealed by sticking a sponge strip) to form the evaporator bin 2.

The connection relationship between the wind-guiding ring 16 and the wind duct rear cover 15 is not unique, for example, the wind-guiding ring 16 may be non-detachably connected with the wind duct rear cover 15, for example, as shown in fig. 20, and the two are integrally formed. In addition, as shown in fig. 18, the wind-guiding ring 16 may be detachably connected to the duct rear cover 15. Because the performance of the fan 3 needs to be tested in the hand board experimental verification stage in the new air-cooled refrigerator research and development process, if the performance (such as noise) test of the fan 3 does not reach the standard, the fan 3 can be replaced, the diameters of the air outlets of the fans 3 with different sizes are different, and the air guide ring 16 with the size matched with the air outlet needs to be arranged (the reason is that if the small fan is used for replacing the large fan, the size of the air guide ring 16 is matched with the size of the small fan, the air inlet efficiency of the fan is reduced by the small air guide ring 16 after the large fan is replaced, if the large fan is used for replacing the small fan, the size of the air guide ring 16 is matched with the size of the large fan, the air suction of the small fan is greatly influenced by the large air guide ring 16 after the small fan is replaced, so that the air inlet efficiency of the fan is reduced, and the air guide ring 16 is also matched with the size of the, if the air guide ring 16 is undetachably connected with the air duct rear cover plate 15, when the fan is replaced, the hand plate of the air duct rear cover plate 15 needs to be manufactured again for experiments, so that manpower, material resources and time are wasted, the hand plate of the air duct rear cover plate 15 needs to be redesigned, the cost for manufacturing the hand plate of the air duct rear cover plate 15 is increased, and the research and development cost of the air-cooled refrigerator is greatly increased. Therefore, compared with the air guide ring 16 and the air duct rear cover plate 15 which are not detachably connected, the air guide ring 16 and the air duct rear cover plate 15 are detachably connected, so that only one universal hand plate of the air duct rear cover plate 15 is designed in the hand plate experiment verification stage, and then the air guide ring 16 adaptive to fans of different sizes is detachably connected to the hand plate of the air duct rear cover plate 15 to complete the experiment to be performed. Therefore, manpower and material resources can be saved, the hand plate of the air duct rear cover plate 15 does not need to be replaced, the utilization rate of the hand plate of the air duct rear cover plate 15 is improved, the research and development period is shortened, and meanwhile, the cost for manufacturing the hand plate is reduced, so that the research and development cost of the air-cooled refrigerator is favorably reduced.

It should be noted that: the hand plate refers to one or more functional templates which are made in advance according to the product appearance drawing or the structure drawing on the premise of not opening a die and are used for checking the reasonability of the appearance or the structure.

Further, the detachable connection mode of the wind-guiding ring 16 and the wind channel rear cover plate 15 is not unique, for example, the wind-guiding ring 16 and the wind channel rear cover plate 15 can be detachably connected by screws. In addition, the air guide ring 16 and the air duct rear cover plate 15 can also be clamped through a clamping structure, specifically, as shown in fig. 15, 17 and 18, the clamping structure includes a first clamp ring 152 formed by extending the air inlet 151 outwards, a ring groove 1521 is formed on the first clamp ring 152, a second clamp ring 161 is formed on the air guide ring 16, an annular rib 1611 is formed on the second clamp ring 161, and the first clamp ring 152 and the second clamp ring 161 are sleeved with each other, so that the ring groove 1521 and the annular rib 1611 are in matched clamping connection. Compare the scheme of connecting through the screw realization can be dismantled, wind-guiding circle 16 passes through the joint structure joint with wind channel back shroud 15, can make the dismantlement between the two more convenient to can shorten both dismantlements time.

The arrangement positions of the annular groove 1521 and the annular rib 1611 can also be interchanged, that is, the annular rib 1611 is formed on the first snap ring 152, and the annular groove 1521 is formed on the second snap ring 161. The structure can also realize the clamping connection of the wind guide ring 16 and the wind channel rear cover plate 15.

Referring to fig. 16 and 17, the air guide ring 16 includes an outer air guide ring 162 and an inner air guide ring 163, the air guide rings 16 with different inlet diameters only have different radian bending shapes of the cross section of the inner air guide ring 163, and the diameter of the second snap ring 161 is not changed, so that when the fan 3 is replaced, the air guide rings 16 with different inlet diameters can be replaced only by clamping the second snap ring 161 on the air duct rear cover plate 15.

Further, the second snap ring 161 is not disposed at a unique position on the wind-guiding ring 16, for example, the cross section of the wind-guiding ring 16 is an arc-shaped structure, and the second snap ring 161 is fixed on the outer edge of the arc-shaped structure. In addition, second snap ring 161 may also be provided in the following manner: as shown in fig. 17, the cross section of the wind-guiding ring 16 is an arc-shaped structure, and the second snap ring 161 is fixed in a concave surface of the arc-shaped structure. The section of the wind guide ring 16 is designed to be an arc-shaped structure, which is to smoothly guide the inlet wind along the radial direction of the wind guide ring 16 into the wind guide ring 16 so as to be conveniently sucked by the fan 3. Compare and be fixed in the outside edge of arc structure, second snap ring 161 is fixed in the concave surface of arc structure, can avoid second snap ring 161 to blockking along 16 radial air intakes of wind-guiding circle like this to be favorable to improving the amount of wind that fan 3 inhales, and then be favorable to improving the air-out efficiency of fan 3.

Referring to fig. 18, after the assembly, a certain gap generally exists between an end surface of the fan 3 near the air inlet 151 and an inner surface of the duct rear cover 15, and after the fan 3 starts to operate, as shown in fig. 19, a low-pressure region naturally forms in a region along a radial direction of the fan 3 and near the duct rear cover 15, and the low-pressure region may cause wind thrown out by the fan 3 to swirl, and the swirling wind easily flows out from the gap between the fan 3 and the duct rear cover 15, which is not favorable for improving the air outlet efficiency of the fan 3. To solve this problem, as shown in fig. 18, the inner surface of the duct rear cover 15 is provided with a backflow preventing ring 153 around the intake opening 151. Through setting up anti-return baffle ring 153, anti-return baffle ring 153 can block the wind that circles round to can avoid the wind that circles round to flow away from the clearance between the one end terminal surface that fan 3 is close to air intake 151 and the internal surface of wind channel back shroud 15, thereby be favorable to improving the air-out efficiency of fan 3.

As shown in fig. 13, three support columns h are provided on an inner side surface of the position of the air duct front cover plate 14 corresponding to the fan 3, the support legs of the fan 3 are fixed to the three support columns h, a rubber vibration damping pad i is provided between the support legs and the support columns h of the fan 3, and the vibration transmission of the fan 3 to the air duct front cover plate 14 can be greatly reduced by providing the rubber vibration damping pad i.

Referring to fig. 18, the thickness of the backflow prevention ring 153 in the axial direction of the fan 3 is H, and the distance between the end surface of the fan 3 near the air inlet 151 and the inner surface of the air duct rear cover 15 is P. Among them, the H value should not be too large or too small. If the H value is too large, the backflow prevention baffle ring 153 easily blocks the wind thrown out by the fan 3 along the radial direction, which is not favorable for improving the wind outlet efficiency of the fan 3; if the value of H is too small, the whirling wind easily bypasses the backflow prevention ring 153 and flows out from the gap between the end surface of the fan 3 near the air inlet 151 and the inner surface of the duct rear cover 15. According to simulation and experiments, when H and P meet the following conditions: when P is less than H and less than P +5mm, the backflow prevention baffle ring 153 can effectively block the whirling wind and prevent the wind thrown out by the fan 3 from blocking, thereby being beneficial to improving the air outlet efficiency of the fan 3.

On the other hand, the embodiment of the invention also provides an air-cooled refrigerator which comprises the air circulation system in any one of the embodiments.

Since the air circulation system used in the air-cooled refrigerator in the embodiment of the invention is the same as that of the air-cooled refrigerator in any one of the embodiments, the air circulation system and the air-cooled refrigerator can solve the same technical problems and achieve the same expected effect. Other structures of the air-cooled refrigerator according to the embodiment of the present invention are well known to those skilled in the art, and will not be described in detail herein.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air circulation system of an air-cooled refrigerator comprises an air duct and an evaporator bin which are communicated with each other, wherein a fan is arranged in the air duct, and an evaporator is arranged in the evaporator bin; the evaporator bin is provided with a first air return opening and a second air return opening, and the first air return opening and the second air return opening are respectively arranged at two ends of the evaporator bin in the width direction.

2. The air circulation system of the air-cooled refrigerator according to claim 1, wherein the fan is located at the air outlet side of the evaporator, the width of the air outlet side of the evaporator is n, the diameter of the fan is d, and the following requirements are met: d is more than n and less than 1.2 d.

3. The air circulation system of the air-cooled refrigerator as claimed in claim 2, wherein the evaporator is trapezoidal, and the upper bottom of the trapezoidal shape is the air outlet side of the evaporator.

4. The air circulation system of the air-cooled refrigerator as claimed in claim 1, wherein the evaporator is a tube-fin evaporator.

5. The air circulation system of the air-cooled refrigerator as claimed in claim 1, wherein the first and second return air inlets are inclined upward at an end thereof adjacent to the inside of the evaporator compartment.

6. The air circulation system of the air-cooled refrigerator as claimed in claim 1, further comprising a third air return opening, wherein the third air return opening is opened at the lower end of the evaporator bin, and the third air return opening blows air upwards.

7. The air circulation system of the air-cooled refrigerator as claimed in claim 6, wherein the first air return opening is used for communicating with the refrigerating chamber, the second air return opening is communicated with the temperature changing chamber, and the third air return opening is communicated with the freezing chamber.

8. The air circulation system of the air-cooled refrigerator according to any one of claims 1 to 4, wherein the air duct comprises an air duct front cover plate and an air duct rear cover plate, an air inlet is formed in the air duct rear cover plate, the evaporator bin is formed on one side, away from the air duct front cover plate, of the air duct rear cover plate, the air inlet is located above the evaporator bin, the fan is located on the inner side of the air inlet, an air guide ring is detachably connected to the air inlet, and the air guide ring is used for guiding air flowing out of the evaporator bin into the air inlet.

9. The air circulation system of the air-cooled refrigerator as claimed in claim 8, wherein the inner surface of the rear cover plate of the air duct is provided with a backflow prevention ring around the air inlet.

10. The air circulation system of the air-cooled refrigerator according to claim 9, wherein the thickness of the anti-backflow baffle ring along the axial direction of the fan is H, the distance between the end surface of the fan near the air inlet and the inner surface of the air duct rear cover plate is P, and the requirements are as follows: h is more than P and less than P +5 mm.

11. The air circulation system of the air-cooled refrigerator according to claim 8, wherein the air guide ring is clamped with the air inlet through a clamping structure, the clamping structure comprises a first clamping ring formed by extending the air inlet outwards, one of an annular groove and an annular rib is formed on the first clamping ring, a second clamping ring is formed on the air guide ring, the other one of the annular groove and the annular rib is formed on the second clamping ring, and the first clamping ring and the second clamping ring are sleeved with each other to enable the annular groove and the annular rib to be matched and clamped.

12. The air circulation system of the air-cooled refrigerator as claimed in claim 11, wherein the cross section of the air guide ring is an arc-shaped structure, and the second snap ring is fixed in a concave surface of the arc-shaped structure.

13. An air-cooled refrigerator comprising the air circulation system according to any one of claims 1 to 12.