A duct system for a refrigerator and use thereof

Abstract

The present application relates to the technical fields of refrigeration display cabinet, in particular to a kind of air duct system and the refrigerator used by it, including refrigeration cabinet and several settings in the refrigeration cabinet inside shelf;Including air supply box, air duct adjusting part and several settings in the air duct adjusting part lower position evaporative fan.The air duct system and the refrigerator used by it, cooling cabinet body inside setting air deflector, through the air deflector of inside setting, the direction of air flow from runway shape air outlet can be adjusted, simultaneously through the mixed flow area of middle air guide bin and top air guide bin in air supply box, different directions vortex in the air flow blown by middle air supply fan and end air supply fan, can be better blown from the air outlet of middle air guide bin and top air guide bin, effectively avoid wind blowing to everywhere after emitting, according to the principle that gas has viscous flow characteristics, so that wind can flow along the arc-shaped wall surface in structure.

Description

Technical Field

[0001] This invention relates to the field of refrigerated display cabinet technology, and more specifically, to an air duct system and a refrigerated cabinet used therein. Background Technology

[0002] This refrigerated display case is a refrigeration and preservation product featuring a dual-green, fluorine-free design, making it both environmentally friendly and aesthetically pleasing. It is widely used in commercial settings such as hotels, supermarkets, and guesthouses, offering features like balanced preservation, frost-free preservation, adjustable shelves, and precise temperature control. Furthermore, it can be used in large stores, supermarkets, convenience stores, hotels, and guesthouses for the preservation, display, and sale of dairy products, meat products, daily necessities, fruits and vegetables, beverages, and dishes.

[0003] Currently used refrigerated display cases all use transparent glass doors. When opening the door to retrieve or load items, the temperature difference between the inside and outside can be as large as 50°C. This can lead to significant loss of cold air and a rapid increase in the internal temperature, potentially from -25°C to above zero. After closing the door, the refrigeration system has to cool down again, which can increase power consumption. In addition, due to high ambient humidity, frost will form on the inner walls and shelves. With repeated operation, the frost will become thicker and thicker, and a layer of frost fog will form on the inner surface of the door, affecting the visual appearance.

[0004] In view of this, we propose an air duct system and the refrigerator used in it.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an air duct system and a freezer used therein, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A freezer includes a refrigeration cabinet and several shelves disposed inside the refrigeration cabinet. The refrigeration cabinet includes a cabinet base, a cabinet shell disposed on top of the cabinet base and open at the front end, and a cooling cabinet disposed inside the cabinet shell and open at the front end.

[0009] A water collection box is installed at the rear end of the cooling cabinet near the top, and air guide plates are installed on the inner side walls of both the left and right ends of the cooling cabinet near the front opening.

[0010] The outer wall of the air guide plate is provided with several linearly distributed and interconnected racetrack-shaped air outlets, and the inner wall of the end of the air guide plate away from the racetrack-shaped air outlets is provided with several sets of linearly distributed and inclined air guide vanes.

[0011] A refrigeration unit is provided in the space gap between the top surface of the cabinet base and the bottom surface of the cooling cabinet, and an evaporator is fixedly connected to the top surface of the water receiving box by bolts.

[0012] In the technical solution of the present invention, the outer shell of the cabinet is fixedly connected to the top surface of the cabinet base by bolts. The cooling cabinet and the outer shell of the cabinet are integrally formed. The outer walls of the left and right ends of the water receiving box are welded and fixed to the inner walls of the left and right ends of the cooling cabinet, respectively. The air guide plate is fixedly connected to the inner wall of the cooling cabinet by screws. The cross-section of the air guide plate is U-shaped. The air guide vane is integrally formed with the air guide plate. The number of air guide vanes and the racetrack-shaped air outlets are the same and their positions correspond one-to-one. The top surface of the air guide vane is high on the outside and low on the inside and the tilt angle is 45 degrees. Several cabinet sliding grooves are provided on the inner walls of the left and right ends of the cooling cabinet. An evaporation channel that runs vertically through the top of the cooling cabinet is provided at the front end of the evaporator.

[0013] In the technical solution of the present invention, a number of regularly distributed auxiliary condensers are fixedly connected to the rear side wall of the cooling cabinet by screws. A glass door is rotatably connected to the outer side wall of one end of the open front end of the cooling cabinet. The size of the glass door is adapted to the external size of the cooling cabinet. A sealing plate is fixedly connected to the front open end of the cabinet shell at the lower position of the cooling cabinet by bolts. A heat dissipation pipe is fixedly connected to the rear side wall of the cabinet shell at the lower position of the cooling cabinet by screws.

[0014] In the technical solution of the present invention, the refrigeration unit includes a condenser, a condensing fan, and a compressor arranged sequentially from front to back. The condenser, condensing fan, and compressor are all fixedly connected to the top surface of the cabinet base by bolts. The condensing fan is equipped with a cooling fan that extends into the air intake ring at the front of the condenser. The inlet end of the condenser is connected to the exhaust pipe of the compressor through an anti-condensation pipe inside the cabinet. A pipe for conveying refrigerant is connected between the outlet of the condenser and the auxiliary condenser. A throttling device is connected between the evaporator and the condenser.

[0015] In the technical solution of the present invention, the placement shelf includes a square frame, several linearly distributed placement rods welded to the top surface of the square frame, a pull rod welded to the top of the several placement rods, several linearly distributed fixing rods welded to the bottom surface of the square frame, and pulleys rotatably connected to the outer walls of the left and right ends of the fixing rods. The longitudinal section of the placement rod is L-shaped.

[0016] The present invention also provides an air duct system, including an air supply box disposed in the top of the refrigeration cabinet, an air duct adjustment section, and a plurality of evaporation fans disposed below the air duct adjustment section;

[0017] The air supply box includes a box shell with an open rear end, a partition plate located on the inner sidewalls of the left and right sides of the front end of the box shell near the bottom, a central air guide chamber located between the left and right partition plates, a top air guide chamber located above the two partition plates, a central air supply fan located inside the central air guide chamber, and an end air supply fan located inside the top air guide chamber near the left and right ends.

[0018] The inner rear sidewall at the downward bend of the front end of the central air guide chamber is provided with a first arc transition groove for forming a mixed flow zone in the central air duct, and a slit air outlet that runs through the inside and outside is provided at the bottom of the front end of the central air guide chamber.

[0019] The inner sidewalls of both ends of the top air guide chamber near the bottom are provided with second arc transition grooves for forming a mixed flow zone in the end air duct.

[0020] The air duct adjustment unit includes a rotating shaft, a drive motor disposed on one side wall of the rotating shaft, and an air duct plate disposed on the outer side wall of the rotating shaft.

[0021] When the fixed position of the air duct plate is perpendicular to the top surface of the cooling cabinet, the evaporator fan blows the cold air generated by the evaporator into the cooling cabinet to cool it. When the fixed position of the air duct plate is inclined to the top surface of the cooling cabinet, the cold air blown by the evaporator fan creates turbulence inside the cooling cabinet, while the air supply box blows air towards the glass door to defrost the cooling cabinet. When the fixed position of the air duct plate is parallel to the top surface of the cooling cabinet, the evaporation channel on the top surface of the cooling cabinet is closed, and the central air supply fan and the end air supply fans in the air supply box start to draw in air. The airflow is blown out from the slit air outlet and the air outlets at both ends of the top air guide chamber. With the help of the air guide plate, two air curtains are formed at the front opening of the cooling cabinet. One air curtain blows from top to bottom from the front opening of the cooling cabinet, and the other air curtain blows from the air guide plates at both ends towards the middle of the cooling cabinet to form heat insulation.

[0022] In the technical solution of the present invention, the partition plate is welded and fixed to the outer shell of the box, the middle air guide chamber is welded and fixed to the outer shell of the box, the top air guide chamber is welded and fixed to the outer shell of the box, an air inlet that runs through the inside and outside is opened on the rear side wall of the middle air guide chamber, and an air inlet that runs through the inside and outside is opened on the rear side wall of the top air guide chamber near the middle position.

[0023] In the technical solution of the present invention, the integrally formed convex shafts at both ends of the central air supply fan are rotatably connected to the inner sidewalls at both ends of the central air guide chamber. One of the convex shafts passes through the outer sidewall of the central air guide chamber and is coaxially connected to the central motor. The central motor is fixedly connected to the outer sidewall of the central air guide chamber by screws. The integrally formed connecting shafts at the front and rear ends of the end air supply fan are rotatably connected to the inner sidewalls at the front and rear ends of the top air guide chamber. The connecting shaft at the rear end passes through the outer sidewall of the top air guide chamber and is coaxially connected to the end fan. The end fan is fixedly connected to the outer sidewall of the top air guide chamber by screws.

[0024] In the technical solution of the present invention, both ends of the rotating shaft are rotatably connected to an integrally formed extension plate located near the middle position on the left and right ends of the rear side wall of the housing. One end of the rotating shaft passes through the outer side wall of the extension plate and is coaxially connected to a drive motor. The drive motor is fixedly connected to the outer side wall of the extension plate by screws. The air duct plate is integrally formed with the rotating shaft. A rubber sleeve is adhered and fixed to the outer side wall of the rotating shaft. A rubber strip for ensuring sealing is adhered and fixed to the outer side wall of the air duct plate.

[0025] In the technical solution of the present invention, the evaporator fan includes an evaporator fan, a fan body cam shaft disposed at the center of the top of the evaporator fan, and a rotating motor whose output end is coaxially connected to the top of the fan body cam shaft. The fan body cam shaft is rotatably connected to an extension rod at the bottom of the rear side wall of the housing. The rotating motor is fixedly connected to the top surface of the extension rod by screws.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. The air duct system and the refrigerator it uses, with the air guide plate inside the cooling cabinet, can adjust the direction of airflow from the racetrack-shaped air outlet through the internal air guide vanes. At the same time, through the mixing area set in the middle air guide chamber and the top air guide chamber in the air supply box, the middle fan and the end fan blow out vortices in different directions in the airflow, which can be blown out better from the air outlet of the middle air guide chamber and the top air guide chamber, effectively preventing the air from scattering in all directions after being blown out. Based on the principle that gas has viscous flow characteristics, the air can flow along the arc-shaped wall surface in the structure.

[0028] 2. In this air duct system and the refrigerator it is used in, when the glass door is opened, the drive motor in the air duct adjustment unit is activated to change the fixed position of the air duct plate. When the air duct plate is parallel to the top surface of the refrigerator, the evaporation channel on the top surface of the refrigerator is closed. At this time, the central motor and the end fans in the air supply box are activated, so that the central air supply fan and the end air supply fans at both ends work simultaneously to start drawing air. This causes the airflow to be blown out from the slit air outlet and the air outlets at both ends of the top air guide chamber. Together with the air guide plate, two air curtains are formed at the open front of the refrigerator, which block the heat exchange between the inside and outside of the refrigerator and prevent the loss of cold air and the rapid rise in temperature inside the refrigerator after the glass door is opened.

[0029] 3. In this air duct system and the freezer it is used in, after the glass door is closed, the drive motor in the air duct adjustment unit is started to change the fixed position of the air duct plate. When the air duct plate is tilted with the freezer body, the rotating motor is started to make the evaporator fan start working. The air blows downward from the evaporation channel on the top surface of the freezer body, creating a turbulence effect inside the freezer body to prevent moisture from accumulating on the inner wall of the cabinet. At the same time, the central motor and the end fan in the air supply box are started to work simultaneously, continuing to blow air onto the glass door, which can quickly remove the fog on the glass door and prevent frost from forming inside the freezer body. Attached Figure Description

[0030] Figure 1 This is a side sectional view of the overall structure of the present invention;

[0031] Figure 2 This is a front sectional view of the overall structure of the present invention;

[0032] Figure 3 This is a cross-sectional view of the air guide plate in this invention;

[0033] Figure 4 This is a side view of the structure of the cooling unit in this invention;

[0034] Figure 5 This is a schematic diagram of the structure for placing the shelf in this invention;

[0035] Figure 6 This is a schematic diagram of the air duct system in this invention;

[0036] Figure 7 This is one of the schematic diagrams showing the location of a portion of the air supply box structure in this invention;

[0037] Figure 8 This is the second schematic diagram showing the location of a portion of the air supply box structure in this invention;

[0038] Figure 9 This is the third schematic diagram showing the location of a portion of the air supply box structure in this invention;

[0039] Figure 10This is a schematic diagram of the structure of the air duct adjustment unit in this invention;

[0040] Figure 11 This is a schematic diagram of the evaporator fan in this invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Refrigeration cabinet; 10. Cabinet base; 11. Cabinet shell; 12. Cooling cabinet body; 120. Water collection box; 121. Air guide plate; 1210. Racetrack-shaped air outlet; 1211. Air guide vane; 13. Auxiliary condenser; 14. Glass door; 15. Sealing plate; 16. Heat dissipation pipe;

[0043] 2. Refrigeration section; 20. Condenser; 21. Condenser fan; 22. Compressor;

[0044] 3. Evaporator;

[0045] 4. Air supply box; 40. Box shell; 41. Spare plate; 42. Middle air guide chamber; 420. First arc transition groove; 421. Slit air outlet; 43. Top air guide chamber; 430. Second arc transition groove; 44. Middle air supply fan; 45. Middle motor; 46. End air supply fan; 47. End fan;

[0046] 5. Air duct adjustment section; 50. Rotating shaft; 51. Rubber sleeve; 52. Drive motor; 53. Air duct plate; 54. Rubber strip;

[0047] 6. Evaporator fan; 60. Evaporator fan; 61. Fan body cam shaft; 62. Rotary motor;

[0048] 7. Shelf; 70. Square frame; 71. Placement rod; 72. Pull-out rod; 73. Fixing rod; 74. Pulley. Detailed Implementation

[0049] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0050] Please see Figures 1-5 The present invention provides a technical solution:

[0051] A freezer includes a refrigeration cabinet 1 and several shelves 7 disposed inside the refrigeration cabinet 1. The refrigeration cabinet 1 includes a cabinet base 10, a cabinet shell 11 disposed on the top of the cabinet base 10 and open at the front end, and a cooling cabinet 12 disposed inside the cabinet shell 11 and open at the front end.

[0052] In this invention, a water receiving box 120 is provided at the rear end of the cooling cabinet 12 near the top, and air guide plates 121 are provided on the inner side walls of both the left and right ends of the cooling cabinet 12 near the front opening.

[0053] Furthermore, the outer wall of the air guide plate 121 is provided with several linearly distributed and interconnected racetrack-shaped air outlets 1210, and the inner wall of the end of the air guide plate 121 away from the racetrack-shaped air outlets 1210 is provided with several sets of linearly distributed and inclined air guide vanes 1211.

[0054] Furthermore, the outer shell 11 of the cabinet is fixedly connected to the top surface of the cabinet base 10 by bolts. The cooling cabinet 12 is integrally formed with the outer shell 11. The outer walls of the left and right ends of the water receiving box 120 are welded and fixed to the inner walls of the left and right ends of the cooling cabinet 12, respectively. The air guide plate 121 is fixedly connected to the inner wall of the cooling cabinet 12 by screws. The transverse cross section of the air guide plate 121 is U-shaped. The air guide vane 1211 is integrally formed with the air guide plate 121. The number of air guide vanes 1211 and the racetrack-shaped air outlet 1210 are the same and their positions correspond one-to-one. The top surface of the air guide vane 1211 is high on the outside and low on the inside and the tilt angle is 45 degrees. Several cabinet slide grooves are provided on the inner walls of the left and right ends of the cooling cabinet 12. An evaporation channel that runs vertically through the top of the cooling cabinet 12 is provided at the front end of the evaporator 3.

[0055] Furthermore, the cabinet base 10 is used to increase the contact area between the overall structure of the refrigeration cabinet 1 and the ground, ensuring the overall stability of the refrigeration cabinet 1. The cabinet shell 11 is used to ensure the strength of the overall structure. The water receiving box 120 inside the cooling cabinet 12 is used to provide an installation platform for the evaporator 3. The racetrack-shaped air outlet 1210 in the air guide plate 121 allows the air blown from both ends of the top air guide chamber 43 to form an air curtain blowing from both ends to the middle at the opening of the cooling cabinet 12. The air guide vane 1211 is used to adjust the air outlet direction. The cabinet slide groove opened on the cooling cabinet 12 is used to facilitate the pull-out of the shelf 7. The evaporation channel opened on the top surface of the cooling cabinet 12 allows the air blown by the evaporator fan 6 to enter the interior of the cooling cabinet 12. The front end of the top of the cooling cabinet 12 is used to provide an installation platform for the air supply box 4.

[0056] In this invention, a number of regularly distributed auxiliary condensers 13 are fixedly connected to the rear side wall of the cooling cabinet 12 by screws. A glass door 14 is rotatably connected to the outer side wall of one end of the open front end of the cooling cabinet 12. The size of the glass door 14 is adapted to the external size of the cooling cabinet 12. A sealing plate 15 is fixedly connected to the front open end of the cabinet shell 11 at the lower position of the cooling cabinet 12 by bolts. A heat dissipation pipe 16 is fixedly connected to the rear side wall of the cabinet shell 11 at the lower position of the cooling cabinet 12 by screws.

[0057] Furthermore, the auxiliary condenser 13 is used to condense the high-temperature and high-pressure refrigerant gas compressed by the compressor 22, dissipating the heat of the refrigerant into the air, and simultaneously condensing the refrigerant liquid into a high-pressure and low-temperature liquid. The glass door 14 is used to facilitate external personnel to observe the internal condition of the cooling cabinet 12. The sealing plate 15 is used to facilitate subsequent disassembly and maintenance of the refrigeration unit 2. The heat dissipation pipe 16 is used to dissipate the heat generated by the refrigeration unit 2 during operation.

[0058] In this invention, a refrigeration unit 2 is provided in the space gap between the top surface of the cabinet base 10 and the bottom surface of the cooling cabinet 12, and an evaporator 3 is fixedly connected to the top surface of the water receiving box 120 by bolts.

[0059] Furthermore, the refrigeration unit 2 includes a condenser 20, a condensing fan 21, and a compressor 22 arranged sequentially from front to back. The condenser 20, condensing fan 21, and compressor 22 are all fixedly connected to the top surface of the cabinet base 10 by bolts. The condensing fan 21 is equipped with a cooling fan that extends into the front air intake ring of the condenser 20. The inlet end of the condenser 20 is connected to the exhaust pipe of the compressor 22 through an anti-condensation pipe inside the cabinet. A pipe for transporting refrigerant is connected between the outlet of the condenser 20 and the auxiliary condenser 13. A throttling device is connected between the evaporator 3 and the auxiliary condenser 13.

[0060] Furthermore, the condenser 20 and condenser fan 21 are used to cool the high-temperature, high-pressure refrigerant gas output from the compressor 22, which then enters the evaporator 3 through a throttling device for evaporation and heat absorption, thereby achieving the purpose of lowering the temperature inside the cabinet. The compressor 22 compresses the refrigerant gas by driving the piston through the motor, and then discharges the high-temperature, high-pressure refrigerant gas into the exhaust pipe, providing power for the refrigeration cycle.

[0061] Furthermore, the evaporator 3 is used to evaporate the low-temperature, low-pressure refrigerant liquid sent by the throttling device into refrigerant saturated vapor to achieve the purpose of refrigeration.

[0062] In this invention, the placement shelf 7 includes a square frame 70, several linearly distributed placement rods 71 ​​welded to the top surface of the square frame 70, pull rods 72 welded to the top of the placement rods 71, several linearly distributed fixing rods 73 welded to the bottom surface of the square frame 70, and pulleys 74 rotatably connected to the outer walls of the left and right ends of the fixing rods 73. The longitudinal section of the placement rods 71 ​​is L-shaped.

[0063] Furthermore, the square frame 70 is used to ensure the overall strength of the shelf 7, the placement rod 71 is used to provide a platform for items that need to be refrigerated, the pull rod 72 is used to facilitate the pulling of the shelf 7 as a whole, the fixing rod 73 is used to provide a rotation base for the pulley 74, and the pulley 74 is used to roll inside the cabinet groove opened on the cooling cabinet 12, so that the movement of the shelf 7 is smoother.

[0064] Please see Figures 6-11 The present invention provides another technical solution:

[0065] An air duct system includes an air supply box 4 disposed in the top of a refrigeration cabinet 1, an air duct adjustment section 5, and a plurality of evaporation fans 6 disposed below the air duct adjustment section 5.

[0066] The air supply box 4 includes a box shell 40 with an open rear end, a partition plate 41 disposed on the inner side wall of the left and right sides of the front end of the box shell 40 near the bottom, a middle air guide chamber 42 disposed between the left and right partition plates 41, a top air guide chamber 43 disposed above the two partition plates 41, a middle air supply fan 44 disposed inside the middle air guide chamber 42, and an end air supply fan 46 disposed inside the top air guide chamber 43 near the left and right ends.

[0067] In this embodiment, as Figures 6-9 As shown, the partition plate 41 is welded and fixed to the outer shell 40 of the box, the middle air guide chamber 42 is welded and fixed to the outer shell 40 of the box, the top air guide chamber 43 is welded and fixed to the outer shell 40 of the box, the middle air guide chamber 42 has an air inlet that runs through the inside and outside, and the top air guide chamber 43 has an air inlet that runs through the inside and outside near the middle position on the rear side wall.

[0068] Furthermore, a first arc transition groove 420 for forming a mixed flow zone in the middle air duct is provided on the inner rear side wall at the downward bend position of the front end of the middle air guide chamber 42, and a slit air outlet 421 with internal and external penetration is provided at the bottom of the front end of the middle air guide chamber 42.

[0069] Furthermore, the inner sidewalls of the top air guide chamber 43 near the bottom at both ends are provided with second arc transition grooves 430 for forming a mixed flow zone in the end air duct.

[0070] Furthermore, the outer casing 40 ensures the stability of the overall structure of the air supply box 4, and the partition plate 41 provides an installation platform for the central air guide chamber 42, while also separating the space between the central air guide chamber 42 and the top air guide chamber 43. The central air guide chamber 42 provides space for the central air supply fan 44 and the central motor 45. The first arc transition groove 420 opened on the central air guide chamber 42 allows the airflow generated by the central air supply fan 44 to mix above the slit outlet 421 after rotation, which can better adjust the airflow direction. To effectively prevent the air from scattering in all directions after being blown out, the top air guide chamber 43 is used to provide placement space for the end fans 46 and the end blowers 47. The second arc transition grooves 430 at both ends of the top air guide chamber 43 are used to ensure that the end air duct generated after the end fans 46 rotate can also form mixed flow above the air outlet. At the same time, the air outlets at both ends of the top air guide chamber 43 are connected to the air guide plate 121 in the cooling cabinet 12, so that the formed end air duct can be blown out from the racetrack-shaped air outlet 1210 in the air guide plate 121.

[0071] In this embodiment, as Figures 7-9 As shown, the central fan 44 has integrally formed convex shafts at both ends, which are rotatably connected to the inner sidewalls of the central air guide chamber 42 at both ends. One of the convex shafts passes through the outer sidewall of the central air guide chamber 42 and is coaxially connected to the central motor 45. The central motor 45 is fixedly connected to the outer sidewall of the central air guide chamber 42 by screws. The end fan 46 has integrally formed connecting shafts at both ends, which are rotatably connected to the inner sidewalls of the front and rear ends of the top air guide chamber 43. The connecting shaft at the rear end passes through the outer sidewall of the top air guide chamber 43 and is coaxially connected to the end fan 47. The end fan 47 is fixedly connected to the outer sidewall of the top air guide chamber 43 by screws.

[0072] Furthermore, after the central motor 45 and the end fans 47 are connected to the external power supply, they respectively drive the central exhaust fan 44 and the end exhaust fans 46 at both ends to rotate, conveying the refrigeration saturated steam generated by the evaporator 3.

[0073] In this embodiment, as Figure 10 As shown, the air duct adjustment unit 5 includes a rotating shaft 50, a drive motor 52 disposed on one side wall of the rotating shaft 50, and an air duct plate 53 disposed on the outer side wall of the rotating shaft 50.

[0074] Furthermore, both ends of the rotating shaft 50 are rotatably connected to an integrally formed extension plate located near the middle of the left and right ends of the rear side wall of the housing 40. One end of the rotating shaft 50 passes through the outer side wall of the extension plate and is coaxially connected to a drive motor 52. The drive motor 52 is fixedly connected to the outer side wall of the extension plate by screws. The air duct plate 53 is integrally formed with the rotating shaft 50. A rubber sleeve 51 is adhered and fixed to the outer side wall of the rotating shaft 50. A rubber strip 54 for ensuring sealing is adhered and fixed to the outer side wall of the air duct plate 53.

[0075] Furthermore, the rotating shaft 50 provides a fixed platform for the rubber sleeve 51 and the air duct plate 53, and the drive motor 52 drives the air duct plate 53 to rotate after the power is turned on. The rubber sleeve 51 and the rubber strip 54 are both used to improve the air guiding effect of the air duct plate 53. When the drive motor 52 in the air duct adjustment section 5 is started, the fixed position of the air duct plate 53 is perpendicular to the top surface of the cooling cabinet 12. At this time, the evaporator fan 6 blows the cold air generated by the evaporator 3 towards the cooling cabinet 12 to achieve the cooling effect of the cooling cabinet 1. When the drive motor 52 in the air duct adjustment section 5 is started, the fixed position of the air duct plate 53 is tilted to the top surface of the cooling cabinet 12. At this time, the evaporator fan 6 blows air downward from the evaporation channel on the top surface of the cooling cabinet 12, forming a turbulence effect inside the cooling cabinet 12 to prevent deep moisture from accumulating on the inner wall of the cabinet. At the same time, the middle motor 45 and the end fan 47 in the air supply box 4 are started. Simultaneously, the airflow continues to blow air onto the glass door 14, quickly removing the fog on the glass door 14 and preventing frost from forming inside the cooling cabinet 12, thus achieving the defrosting effect of the cooling cabinet 1. When the drive motor 52 in the air duct adjustment section 5 is activated so that the fixed position of the air duct plate 53 is parallel to the top surface of the cooling cabinet 12, the evaporation channel on the top surface of the cooling cabinet 12 is closed. At this time, the middle motor 45 and the end fan 47 in the air supply box 4 are activated, so that the middle fan 44 and the end fans 46 at both ends work simultaneously to start drawing air, causing the airflow to be blown out from the slit air outlet 421 and the air outlets at both ends of the top air guide chamber 43. Together with the air guide plate 121, two air curtains are formed at the open front end of the cooling cabinet 12, blocking the heat exchange between the inside and outside of the cabinet, preventing the loss of cold air and the rapid rise in temperature inside the cooling cabinet 12 after the glass door 14 is opened, thus achieving the heat insulation effect of the cooling cabinet 1.

[0076] In this embodiment, as Figure 11 As shown, the evaporator fan 6 includes an evaporator fan 60, a fan body cam 61 located at the center of the top of the evaporator fan 60, and a rotary motor 62 whose output end is coaxially connected to the top of the fan body cam 61. The fan body cam 61 is rotatably connected to an extension rod at the bottom of the rear side wall of the housing 40, and the rotary motor 62 is fixedly connected to the top surface of the extension rod by screws.

[0077] Furthermore, after the rotating motor 62 is powered on, it drives the evaporator fan 60 to rotate through the fan body cam 61, which in turn drives the saturated refrigerant vapor generated by the evaporator 3 to be blown into the interior of the cooling cabinet 12 through the evaporation channel on the top surface of the cooling cabinet 12, thereby achieving the cooling effect in the cooling cabinet 1.

[0078] Finally, it should be noted that the condenser fan 21, compressor 22, evaporator 3, central motor 45, end fan 47, drive motor 52, and rotary motor 62 involved in this invention are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle parts of this device, the condenser fan 21, compressor 22, evaporator 3, central motor 45, end fan 47, drive motor 52, and rotary motor 62 are connected to an external power source through wires. The specific connection methods should refer to the working principle in this invention. The electrical connections between each electrical component are completed in the order of their operation. The detailed connection methods are all technologies known in the art.

[0079] When the air duct system of the present invention and the refrigerator used therein are in use, the drive motor 52 in the air duct adjustment unit 5 is first started so that the fixed position of the air duct plate 53 is perpendicular to the top surface of the cooling cabinet 12. At this time, after the condenser fan 21 and compressor 22 in the refrigeration unit 2 are connected to the external power supply, the refrigerant in the condenser 20 is delivered to the inside of the compressor 22 and to the inside of the auxiliary condenser 13. The refrigerant liquid in the auxiliary condenser 13 is delivered to the inside of the evaporator 3 by the throttling device, so that the evaporator 3 evaporates it into refrigerant saturated vapor. Then, the rotating motor 62 in the evaporator fan 6 is started, and the evaporator fan 60 is driven to rotate through the fan body cam 61. The refrigerant saturated vapor generated by the evaporator 3 is blown into the inside of the cooling cabinet 12 through the evaporation channel on the top surface of the cooling cabinet 12, thereby achieving the cooling effect of the refrigerator 1.

[0080] Subsequently, when defrosting is required inside the refrigeration cabinet 1, the drive motor 52 in the air duct adjustment section 5 is restarted, and the fixed position of the air duct plate 53 is kept tilted to the top surface of the cooling cabinet 12. At this time, the evaporation fan 6 blows air downward from the evaporation channel on the top surface of the cooling cabinet 12, creating a turbulence effect inside the cooling cabinet 12 to prevent deep moisture from accumulating on the inner wall of the cabinet. At the same time, the middle motor 45 and the end fan 47 in the air supply box 4 are started to work simultaneously, continuing to blow air onto the glass door 14, which can quickly remove the fog on the glass door 14 and prevent frost from forming inside the cooling cabinet 12.

[0081] Subsequently, when the glass door 14 needs to be opened, the drive motor 52 in the air duct adjustment section 5 is started again, and the fixed position of the air duct plate 53 is kept horizontal with the top surface of the cooling cabinet 12. After ensuring that the evaporation channel on the top surface of the cooling cabinet 12 is closed, the middle motor 45 and the end fan 47 in the air supply box 4 are started, respectively driving the middle air supply fan 44 and the end air supply fans 46 at both ends to start drawing air. The airflow is blown out from the air outlet 421 and the air outlets at both ends of the top air guide chamber 43. With the help of the air guide plate 121, two air curtains are formed at the front opening of the cooling cabinet 12. One air curtain blows from the front opening of the cooling cabinet 12 downwards, and the other air curtain blows from the air guide plates 121 at both ends towards the middle of the cooling cabinet 12. This blocks the heat exchange between the inside and outside of the cabinet, and avoids the loss of cold air and the rapid rise in temperature inside the cooling cabinet 12 after the glass door 14 is opened, thus achieving the heat insulation effect of the refrigeration cabinet 1.

[0082] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A duct system comprising a refrigeration cabinet (1), an evaporator (3), and several shelves (7) disposed inside the refrigeration cabinet (1), wherein the refrigeration cabinet (1) comprises a cooling cabinet body (12), and air guide plates (121) are disposed on the inner side walls of both the left and right ends of the cooling cabinet body (12) near the front opening, characterized in that: It also includes an air supply box (4) installed in the top of the refrigeration cabinet (1), an air duct adjustment section (5), and several evaporation fans (6) installed below the air duct adjustment section (5); The air supply box (4) includes a box shell (40) with an open rear end, a partition plate (41) located on the inner side wall of the left and right sides of the front end of the box shell (40) near the bottom, a middle air guide chamber (42) located between the two partition plates (41), a top air guide chamber (43) located above the two partition plates (41), a middle air supply fan (44) located inside the middle air guide chamber (42), and an end air supply fan (46) located inside the top air guide chamber (43) near the left and right ends. The central air guide chamber (42) has a first arc transition groove (420) on the inner rear side wall at the downward bend position of the front end for forming a mixed flow zone in the central air duct, and a slit air outlet (421) with internal and external penetration is provided at the bottom of the front end of the central air guide chamber (42). The top air guide chamber (43) has a second arc transition groove (430) on the inner side wall near the bottom at both ends for forming a mixed flow zone in the end air duct. The air duct adjustment unit (5) includes a rotating shaft (50), a drive motor (52) disposed on one side wall of the rotating shaft (50), and an air duct plate (53) disposed on the outer side wall of the rotating shaft (50). When the fixed position of the air duct plate (53) is perpendicular to the top surface of the cooling cabinet (12), the evaporator fan (6) blows the cold air generated by the evaporator (3) toward the cooling cabinet (12) to cool the refrigeration cabinet (1); when the fixed position of the air duct plate (53) is inclined to the top surface of the cooling cabinet (12), the cold air blown by the evaporator fan (6) forms turbulence inside the cooling cabinet (12), and at the same time, the air supply box (4) blows air toward the glass door (14) to defrost the refrigeration cabinet (1); when the fixed position of the air duct plate (53) is parallel to the top surface of the cooling cabinet (12)... When running, the evaporation channel on the top surface of the cooling cabinet (12) is closed, and the middle fan (44) and the end fans (46) in the air supply box (4) start to draw air at the same time. The airflow is blown out from the air outlet (421) and the air outlets at both ends of the top air guide chamber (43). With the help of the air guide plate (121), two air curtains are formed at the front opening of the cooling cabinet (12). One air curtain blows from the front opening of the cooling cabinet (12) downwards, and the other air curtain blows from the air guide plates (121) at both ends towards the middle of the cooling cabinet and towards the refrigeration cabinet (1) to form heat insulation.

2. The air duct system according to claim 1, characterized in that: The partition plate (41) is welded and fixed to the outer shell of the box (40), the middle air guide chamber (42) is welded and fixed to the outer shell of the box (40), the top air guide chamber (43) is welded and fixed to the outer shell of the box (40), the middle air guide chamber (42) has an air inlet that runs through the inside and outside on the rear side wall, and the top air guide chamber (43) has an air inlet that runs through the inside and outside on the rear side wall near the middle position.

3. The air duct system according to claim 2, characterized in that: The central fan (44) has integrally formed convex shafts at both ends, which are rotatably connected to the inner sidewalls of the central air guide chamber (42) at both ends. One of the convex shafts passes through the outer sidewall of the central air guide chamber (42) and is coaxially connected to the central motor (45). The central motor (45) is fixedly connected to the outer sidewall of the central air guide chamber (42) by screws. The end fan (46) has integrally formed connecting shafts at both ends, which are rotatably connected to the inner sidewalls of the front and rear ends of the top air guide chamber (43). The connecting shaft at the rear end passes through the outer sidewall of the top air guide chamber (43) and is coaxially connected to the end fan (47). The end fan (47) is fixedly connected to the outer sidewall of the top air guide chamber (43) by screws.

4. The air duct system according to claim 3, characterized in that: Both ends of the rotating shaft (50) are rotatably connected to an integrally formed extension plate at the left and right ends near the middle of the rear side wall of the housing (40). One end of the rotating shaft (50) passes through the outer side wall of the extension plate and is coaxially connected to a drive motor (52). The drive motor (52) is fixedly connected to the outer side wall of the extension plate by screws. The air duct plate (53) is integrally formed with the rotating shaft (50). A rubber sleeve (51) is adhered and fixed to the outer side wall of the rotating shaft (50). A rubber strip (54) for ensuring sealing is adhered and fixed to the outer side wall of the air duct plate (53).

5. The air duct system according to claim 4, characterized in that: The evaporator fan (6) includes an evaporator fan (60), a fan body cam (61) located at the center of the top of the evaporator fan (60), and a rotating motor (62) whose output end is coaxially connected to the top of the fan body cam (61). The fan body cam (61) is rotatably connected to an extension rod at the bottom of the rear side wall of the housing (40), and the rotating motor (62) is fixedly connected to the top surface of the extension rod by screws.

6. A freezer using the air duct system of claim 5, characterized in that: The refrigeration cabinet (1) also includes a cabinet base (10), a cabinet shell (11) disposed on the top of the cabinet base (10) and open at the front end, and a cooling cabinet (12) disposed inside the cabinet shell (11) and open at the front end. A water receiving box (120) is provided at the rear end of the cooling cabinet (12) near the top. The outer side wall of the air guide plate (121) is provided with a number of linearly distributed and interconnected racetrack-shaped air outlets (1210), and the inner side wall of the end of the air guide plate (121) away from the racetrack-shaped air outlets (1210) is provided with a number of linearly distributed and inclined air guide vanes (1211). A refrigeration unit (2) is provided in the space gap between the top surface of the cabinet base (10) and the bottom surface of the cooling cabinet (12), and an evaporator (3) is fixedly connected to the top surface of the water receiving box (120) by bolts.

7. The freezer according to claim 6, characterized in that: The outer shell of the cabinet (11) is fixedly connected to the top surface of the cabinet base (10) by bolts. The cooling cabinet (12) is integrally formed with the outer shell of the cabinet (11). The air guide plate (121) is fixedly connected to the inner wall of the cooling cabinet (12) by screws. The cross section of the air guide plate (121) is U-shaped. The number of air guide plates (1211) is the same as that of the air guide plate (121). The number of air guide plates (1211) and the position of the racetrack-shaped air outlet (1210) are the same. The top surface of the air guide plate (1211) is high on the outside and low on the inside and the tilt angle is 45 degrees. Several cabinet sliding grooves are provided on the inner walls of both the left and right ends of the cooling cabinet (12). An evaporation channel that runs vertically through the top surface of the cooling cabinet (12) is provided at the front end of the evaporator (3).

8. The freezer according to claim 7, characterized in that: Several regularly distributed auxiliary condensers (13) are fixedly connected to the rear side wall of the cooling cabinet (12) by screws. A glass door (14) is rotatably connected to the outer side wall of one end of the front opening of the cooling cabinet (12). The size of the glass door (14) is adapted to the external size of the cooling cabinet (12). A sealing plate (15) is fixedly connected to the front opening of the cabinet shell (11) at the lower position of the cooling cabinet (12) by bolts. A heat dissipation pipe (16) is fixedly connected to the rear side wall of the cabinet shell (11) at the lower position of the cooling cabinet (12) by screws.

9. The freezer according to claim 8, characterized in that: The refrigeration unit (2) includes a condenser (20), a condensing fan (21), and a compressor (22) arranged sequentially from front to back. The condenser (20), condensing fan (21), and compressor (22) are all fixedly connected to the top surface of the cabinet base (10) by bolts. The condensing fan (21) is equipped with a cooling fan that extends into the air intake ring at the front of the condenser (20). The inlet end of the condenser (20) is connected to the exhaust pipe of the compressor (22) through an anti-condensation pipe inside the cabinet. A pipe for transporting refrigerant is connected between the outlet of the condenser (20) and the auxiliary condenser (13). A throttling device is connected between the evaporator (3) and the auxiliary condenser (13).

10. The freezer according to claim 9, characterized in that: The placement shelf (7) includes a square frame (70), several linearly distributed placement rods (71) welded to the top surface of the square frame (70), a pull rod (72) welded to the top of the several placement rods (71), several linearly distributed fixing rods (73) welded to the bottom surface of the square frame (70), and pulleys (74) rotatably connected to the outer walls of the left and right ends of the fixing rods (73). The longitudinal section of the placement rods (71) is L-shaped.

Images