Air-door-free air cooling refrigerator

Abstract

The invention is suitable for the technical field of air-cooled refrigerators, and provides an air-door-free air-cooled refrigerator which comprises a refrigerator body and a back plate. The interior of the refrigerator body is sequentially divided into a freezing chamber, a variable-temperature chamber and a refrigerating chamber from bottom to top through partition plates. A main air duct is arranged in the back plate; the main air duct is formed by connecting three groups of Venturi tube structure units in series along the airflow direction; the Venturi tube structure unit comprises a gradually-shrinking section and a gradually-expanding section; a throat section is arranged between the gradually-shrinking section and the gradually-expanding section in a communicating mode. The three-throat section is provided with a freezing chamber branch channel, a variable temperature chamber branch channel and a refrigerating chamber branch channel from bottom to top in a communicating mode. According to the device, a mechanical structure of a physical air door is eliminated through innovative design, fault hidden dangers caused by blades, a motor and a transmission part are solved, and the problem of insufficient temperature control precision caused by mechanical delay is avoided; an air duct system and cold air circulation logic are optimized, complexity of multi-air-door cooperative control is avoided, and accurate and efficient distribution of cold air in all chambers is achieved.

Description

Technical Field

[0001] This invention relates to the field of air-cooled refrigerator technology, and more specifically, to a doorless air-cooled refrigerator. Background Technology

[0002] Traditional multi-door air-cooled refrigerators rely on the technology of regulating cold air through dampers. This is a combination of mechanical structure and electronic control. The damper system consists of actuators (including low-temperature resistant blades, drive micro motors and transmission mechanisms) and control components (main control board program modules), which are installed at the intersection of the main air duct and the branch air ducts of each compartment.

[0003] During operation, the temperature of each compartment is collected in real time by temperature sensors. The main control board sends opening, angle adjustment or closing commands to the corresponding door motors according to the temperature difference, forming a closed-loop control to distribute cold air. However, traditional multi-door air-cooled refrigerators have limitations such as mechanical delay, structural constraints and easy failure of multi-door coordination due to their reliance on the mechanical movement of physical blades. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a doorless air-cooled refrigerator. Through innovative design, it eliminates the mechanical structure of physical air doors, solves the potential for malfunctions caused by blades, motors, and transmission components, and avoids the problem of insufficient temperature control accuracy caused by mechanical delays. It also optimizes the air duct system and cold air circulation logic, avoids the complexity of multi-door coordinated control, and achieves precise and efficient distribution of cold air in each compartment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A doorless, air-cooled refrigerator includes a refrigerator body and a back panel. The interior of the refrigerator body is divided into a freezer compartment, a variable temperature compartment, and a refrigerator compartment from bottom to top by a partition. A main air duct is provided inside the back panel. The main air duct is composed of three sets of Venturi tube structural units connected in series along the airflow direction. Each Venturi tube structural unit includes a converging section and a expanding section. A throat section is provided between the converging section and the expanding section. From bottom to top, the three throat sections are respectively connected to branch channels for the freezer compartment, the variable temperature compartment, and the refrigerator compartment, which are used to distribute the cooling airflow to the interior of the freezer compartment, the variable temperature compartment, and the refrigerator compartment, respectively.

[0007] The present invention is further configured such that: the tapered end of the lowermost Venturi tube structural unit is connected to a streamlined, gradually changing front air duct.

[0008] The invention is further configured such that: an electrical compartment is located at the bottom of the refrigerator body below the freezer compartment; a main control board is installed in the electrical compartment; a variable speed fan and an evaporator are sequentially installed inside the electrical compartment; and temperature sensors are installed inside the freezer compartment, the variable temperature compartment, and the refrigerator compartment.

[0009] The present invention is further configured such that: an air supply pipe is provided between the bottom end of the streamlined gradient front air duct and the air outlet of the variable speed fan; a first return pipe is provided at the end of the gradually expanding section of the uppermost Venturi tube structural unit; a second return pipe is provided on the evaporator; and the first return pipe and the second return pipe are connected by a flexible hose.

[0010] The invention is further configured such that: the end of the branch channel of the refrigerator compartment is connected to an air outlet straight pipe; the end of the branch channel of the variable temperature compartment is connected to an air outlet curved pipe inclined upwards; and the branch channel of the freezer compartment is an air outlet directly opened on the corresponding throat section.

[0011] The present invention is further configured such that: a guide frame communicating with the air outlet is fixed on the inner wall of the freezer chamber; a multi-dimensional three-dimensional guide grille is provided inside both the guide frame and the straight air outlet pipe; the multi-dimensional three-dimensional guide grille includes several sets of vertical guide ribs and horizontal guide ribs arranged perpendicularly to each other.

[0012] The present invention is further configured such that: a Coanda effect curved guide plate is provided at the end of the air outlet bend.

[0013] The advantages of this invention are:

[0014] 1. This invention eliminates the mechanical structure of physical dampers through innovative design, solving potential faults caused by blades, motors, and transmission components, and avoiding insufficient temperature control accuracy due to mechanical delays; it optimizes the air duct system and cold air circulation logic, overcoming the space occupation and cold air circulation efficiency obstruction of damper layout, and reducing cold air leakage caused by structural gaps; it avoids the complexity of multi-damper coordinated control, achieving precise and efficient distribution of cold air in each compartment, while reducing energy consumption caused by component wear and frequent adjustments, and improving the refrigerator's operational stability, preservation effect, and user experience.

[0015] 2. The branch channels of the freezer compartment of this invention have the least resistance, allowing cold air to pass through preferentially and in large quantities; the branch channels of the variable temperature compartment are combined with the Coanda curved guide plate, so that the airflow adheres to the rear wall or top wall to form a large circulation and eliminate dead corners; the branch channels of the refrigerator compartment are combined with multi-dimensional guide grilles to disperse the airflow and achieve wide-angle, gentle and uniform air delivery. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a doorless air-cooled refrigerator according to the present invention.

[0017] Figure 2 For the present invention Figure 1 Enlarged view of region A.

[0018] Figure 3 This is a schematic diagram of the straight air outlet pipe of the present invention.

[0019] Figure 4 This is a schematic diagram of the flow guide frame of the present invention.

[0020] Figure 5 This is a schematic diagram of the optimized main air duct system structure of the present invention.

[0021] In the diagram: 1. Refrigerator body; 2. Back panel; 3. Freezer compartment; 4. Variable temperature compartment; 5. Refrigerator compartment; 6. Venturi tube structural unit; 7. Shrinking section; 8. Expanding section; 9. Throat section; 10. Freezer compartment branch channel; 11. Variable temperature compartment branch channel; 12. Refrigerator compartment branch channel; 13. Streamlined gradient front air duct; 14. Electrical compartment; 15. Variable speed fan; 16. Evaporator; 17. Temperature sensor; 18. Air supply duct; 19. First return duct; 20. Second return duct; 21. Straight air outlet duct; 22. Air outlet bend; 23. Air outlet; 24. Air guide frame; 25. Multi-dimensional air guide grille; 26. Vertical air guide rib; 27. Horizontal air guide rib; 28. Coanda effect curved surface air guide plate. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0025] Example 1, please refer to Figures 1-5 The present invention provides the following technical solutions:

[0026] Specifically, it refers to a doorless air-cooled refrigerator, including a refrigerator body 1 and a back panel 2; the interior of the refrigerator body 1 is divided into a freezer compartment 3, a variable temperature compartment 4 and a refrigerator compartment 5 from bottom to top by a partition; the back panel 2 is provided with a main air duct; the main air duct is composed of three sets of Venturi tube structural units 6 connected in series along the airflow direction; the Venturi tube structural unit 6 includes a tapering section 7 and a widening section 8; a throat section 9 is provided between the tapering section 7 and the widening section 8; from bottom to top, the three throat sections 9 are respectively connected to the freezer compartment branch channel 10, the variable temperature compartment branch channel 11 and the refrigerator compartment branch channel 12, which are used to distribute the cooling airflow to the interior of the freezer compartment 3, the variable temperature compartment 4 and the refrigerator compartment 5.

[0027] The specific application of this embodiment is as follows:

[0028] The Venturi tube structural unit 6 (i.e., the narrow middle throat section 9) utilizes the principle of increased flow velocity and decreased pressure in the throat section 9 to create a "negative pressure suction" effect at the inlets of the freezer branch channel 10, the variable temperature compartment branch channel 11, and the refrigerator branch channel 12. Even if the freezer branch channel 10, the variable temperature compartment branch channel 11, and the refrigerator branch channel 12 do not have dampers, it can still ensure that a sufficient proportion of cold air is "actively" drawn in, thus solving the problem of insufficient airflow in the unpowered branch channels.

[0029] By combining data from the variable speed fan 15 and the temperature sensor 17, the main control board adjusts the speed of the variable speed fan 15 and the optimized main air duct in real time to achieve dynamic air distribution. This achieves the multi-channel independent control effect that previously required multiple dampers, significantly improving temperature control accuracy, eliminating mechanical delay in response, adapting to real-time temperature changes in each room, resulting in significant energy savings and reduced compressor start-stop frequency.

[0030] Eliminating the damper and its installation structure frees up internal space in the refrigerator body 1, improving volume utilization; the main air duct is integrated with the interior design, enhancing visual cohesion.

[0031] By implementing a damperless design and optimizing the air duct, system energy consumption is reduced, including eliminating damper motor power consumption and improving cooling efficiency.

[0032] Example 2, please refer to Figures 1-5 This embodiment two is an improvement on the first embodiment. Specifically, the end of the tapered section 7 in the lowest Venturi tube structural unit 6 is connected to a streamlined, gradually changing front air duct 13.

[0033] The streamlined, gradually changing front air duct 13 has a cross-sectional shape that smoothly transitions from a circular or square shape at the compressor compartment outlet to a flat rectangle that adapts to the back plate 2. The entire transition section adopts a tapered-expanding design similar to aviation ducts to avoid abrupt changes in cross-sectional area, effectively reducing eddy current generation and airflow energy loss, and ensuring that the cold air can enter the distribution area with the lowest resistance and the highest efficiency after exiting the fan.

[0034] An electrical compartment 14 is located at the bottom of the refrigerator body 1, below the freezer compartment 3; the main control board is installed in the electrical compartment 14; a variable speed fan 15 and an evaporator 16 are installed in sequence inside the electrical compartment 14; temperature sensors 17 are installed inside the freezer compartment 3, the variable temperature compartment 4, and the refrigerator compartment 5.

[0035] An air supply pipe 18 is provided between the bottom end of the streamlined, gradually changing front air duct 13 and the air outlet of the variable speed fan 15; a first return pipe 19 is provided at the end of the gradually expanding section 8 in the uppermost Venturi tube structural unit 6; a second return pipe 20 is provided on the evaporator 16; the first return pipe 19 and the second return pipe 20 are connected by a flexible hose.

[0036] The end of the cold storage branch channel 12 is connected to an air outlet straight pipe 21; the end of the variable temperature compartment branch channel 11 is connected to an air outlet bend 22 with an upward tilt; the freezer compartment branch channel 10 is an air outlet 23 directly opened on the corresponding throat section 9; the end of the air outlet bend 22 is provided with a Coanda effect curved guide plate 28.

[0037] The Coanda effect curved guide plate 28 is an arc-shaped guide plate with a specific radius of curvature. When airflow blows towards the curved surface, it will flow along the curved surface, guiding the airflow to flow closely along the top or side wall of the variable temperature chamber 4, forming a "cold air curtain". It will naturally sink under gravity to achieve three-dimensional circulation without dead angles, greatly improving temperature uniformity.

[0038] The cold storage compartment branch channel 12 uses the straight exhaust pipe 21 to make the airflow direction more biased towards the door, which is conducive to the cold air sinking evenly to the entire large space; the variable temperature compartment branch channel 11 uses the exhaust bend pipe 22 to make the branch opening face the rear wall of the variable temperature compartment 4, and through the setting of the Coanda effect curved guide plate 28, the airflow is made to flow along the rear wall by the Coanda effect, forming a large circulation covering the entire variable temperature compartment 4; the freezer compartment branch channel 10 uses the exhaust port 23 as a natural extension of the main air duct, ensuring that most of the airflow enters the freezer compartment 3 by inertia.

[0039] The inner wall of the freezer compartment 3 is fixed with a guide frame 24 that communicates with the air outlet 23; the guide frame 24 and the air outlet straight pipe 21 are both provided with multi-dimensional three-dimensional guide grilles 25; the multi-dimensional three-dimensional guide grilles 25 include several sets of vertical guide ribs 26 and horizontal guide ribs 27 arranged perpendicularly to each other.

[0040] The vertical guide ribs 26 divide the airflow into multiple thin-layered airflows, expanding the vertical coverage area; the horizontal guide ribs 27 guide the airflow to the left and right, achieving horizontal diffusion. The cold air is delivered in the form of an "area source" rather than a "point source", fundamentally avoiding direct blowing on the food and local overcooling, and achieving a rapid and uniform temperature field.

[0041] One specific application of this embodiment is:

[0042] When the refrigerator compartment 5 needs cooling: The main control board slightly increases the speed of the variable speed fan 15. Since the resistance of the refrigerator compartment branch channel 12 is relatively large, the increase in speed will significantly increase its air volume, while having little impact on the air volume of the freezer compartment 3, which is the main channel. When the freezer compartment 3, the variable temperature compartment 4, and the refrigerator compartment 5 reach the set temperature, the variable speed fan 15 drops to the minimum maintenance speed, providing only the basic circulating air volume. In the rapid cooling mode: the variable speed fan 15 runs continuously at high speed, using the optimized air duct system to quickly deliver the maximum cooling capacity to the freezer compartment 3, the variable temperature compartment 4, and the refrigerator compartment 5. If the freezer compartment 3 needs cold air, the speed of the variable speed fan 15 is appropriately increased, but since the air duct resistance of the freezer compartment 3 is small, sufficient air volume can be obtained even at a low speed.

[0043] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A doorless, air-cooled refrigerator, comprising a refrigerator body (1) and a back panel (2); the interior of the refrigerator body (1) is divided from bottom to top by partitions into a freezer compartment (3), a variable temperature compartment (4), and a refrigerator compartment (5); characterized in that: The back panel (2) is provided with a main air duct inside; the main air duct is composed of three sets of Venturi tube structural units (6) connected in series along the airflow direction; The Venturi tube structural unit (6) includes a tapered section (7) and a widening section (8); a throat section (9) is connected between the tapered section (7) and the widening section (8); from bottom to top, the three throat sections (9) are respectively connected to the freezer compartment branch channel (10), the variable temperature compartment branch channel (11) and the refrigerator compartment branch channel (12), which are used to distribute the cooling airflow to the freezer compartment (3), the variable temperature compartment (4) and the refrigerator compartment (5).

2. The doorless air-cooled refrigerator according to claim 1, characterized in that: The tapered section (7) of the venturi tube structural unit (6) at the bottom is connected to a streamlined, tapered front air duct (13).

3. A doorless, air-cooled refrigerator according to claim 2, characterized in that: The bottom of the refrigerator body (1) is located below the freezer compartment (3) and has an electrical compartment (14); the electrical compartment (14) is equipped with a main control board; the electrical compartment (14) is equipped with a variable speed fan (15) and an evaporator (16) in sequence; the freezer compartment (3), the variable temperature compartment (4) and the refrigerator compartment (5) are all equipped with temperature sensors (17).

4. A doorless air-cooled refrigerator according to claim 3, characterized in that: An air supply pipe (18) is provided between the bottom end of the streamlined gradient front air duct (13) and the air outlet of the variable speed fan (15); a first return pipe (19) is provided at the end of the gradually expanding section (8) in the uppermost Venturi tube structural unit (6); a second return pipe (20) is provided on the evaporator (16); the first return pipe (19) and the second return pipe (20) are connected by a flexible hose.

5. A doorless air-cooled refrigerator according to claim 4, characterized in that: The end of the cold storage branch channel (12) is connected to an air outlet straight pipe (21); the end of the variable temperature compartment branch channel (11) is connected to an air outlet bend (22) with the end tilted upward; the freezer compartment branch channel (10) is an air outlet (23) directly opened on the corresponding throat section (9).

6. A doorless air-cooled refrigerator according to claim 5, characterized in that: The inner wall of the freezer compartment (3) is fixed with a guide frame (24) that communicates with the air outlet (23); the guide frame (24) and the air outlet straight pipe (21) are both provided with multi-dimensional three-dimensional guide grilles (25); the multi-dimensional three-dimensional guide grilles (25) include several sets of vertical guide ribs (26) and horizontal guide ribs (27) arranged perpendicularly to each other.

7. A doorless, air-cooled refrigerator according to claim 6, characterized in that: The end of the air outlet bend (22) is provided with a Coanda effect curved guide plate (28).

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