Low temperature storage device

Abstract

The present invention provides a low-temperature storage device, comprising: a main body, the main body having at least one storage chamber; a cold air supply device; and a fan device, wherein the fan device comprises: a fan bracket, a wheel shaft and a plurality of blades; in any blade, the intersection of the blade and the side wall of the wheel shaft forms a first intersection line and a second intersection line, the blade is bent from the second intersection line toward the first intersection line, the end face of the wheel shaft is defined as a reference plane, the two end points of the first intersection line are respectively used as tangent points to form a first tangent line and a second tangent line with the first intersection line, the angle formed between the first tangent line and the reference plane is α, wherein 10°≤α≤20°, the angle formed between the second tangent line and the reference plane is β, wherein 45°≤β≤60°. The low-temperature storage device using the technical solution of the present invention can reduce the thickness of the fan device under the premise of ensuring sufficient air volume in the air duct, and increase the storage capacity of goods in the low-temperature storage device.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a low-temperature storage device. Background Art

[0002] A refrigerator is a refrigeration device that maintains a constant low temperature. It is also a product that keeps food or other items in a constant low temperature cold state. Existing refrigeration equipment uses a refrigerator combined with a storage cabinet to form a new low-temperature storage device to meet the storage needs of goods or cargo. A wine cabinet refers to a refrigerator used to store wine. There are many devices on the market that organically combine refrigerators and wine cabinets to form refrigerator wine cabinets. Refrigerator wine cabinets are mainly used for refrigeration of wine products, and wine products are generally bottled structures. Storage placement needs to be sideways so that bottled wine can be stored in large quantities. The refrigerator wine cabinet is provided with a storage room for storing wine, a cold air supply device, an air duct for cold air circulation, and a fan assembly located in the air duct. The fan assembly, on the one hand, serves to drain the cold air, and on the other hand, it can dissipate heat and cool down the equipment in the refrigerator wine cabinet, thereby ensuring that the temperature in the storage room meets the storage needs of wine products.

[0003] In the prior art, an isolation panel is provided between the storage room and the air duct in the wine cabinet, and the fan device and the storage room are located on both sides of the isolation panel. In order to meet the air volume requirement in the air duct, the refrigerator wine cabinet uses a fan device with a larger power. Specifically, the fan device is thicker, so it is necessary to provide a corresponding avoidance groove on the isolation panel to accommodate the fan device, that is, the isolation panel is raised toward the storage room at the fan device, such as Figure 1 As shown, based on the above structure, the storage room corresponding to the fan device cannot store wine, which reduces the amount of wine that can be stored in the refrigerator wine cabinet. In addition, the isolation panels used in the refrigerator wine cabinet are generally made of high-end glass panels, steel plates or surface light source panels, and the provision of a raised portion on the isolation partition will result in high cost of the isolation panel and difficulty in processing. Summary of the invention

[0004] The object of the present invention is to provide a low-temperature storage device, which can reduce the thickness of the fan device while ensuring sufficient air volume, so that the processing cost of the isolation panel is low and the storage capacity of the goods in the low-temperature storage device is increased.

[0005] Based on this, the present invention provides a low-temperature storage device, comprising:

[0006] a main body having at least one storage chamber;

[0007] a cold air supply device configured to supply cold air to the storage chamber;

[0008] as well as

[0009] a fan device configured to guide the cold air generated by the cold air supply device into the storage space of the storage chamber, wherein the fan device comprises:

[0010] A fan bracket, a wheel shaft rotatably arranged in the middle of the fan bracket, and a plurality of fan blades arranged in an array on the periphery of the wheel shaft;

[0011] In any of the fan blades, the intersection of the fan blade and the side wall of the wheel axle forms a first intersection line and a second intersection line, the first intersection line is a curve, the fan blade is bent from the second intersection line toward the first intersection line, the end face of the wheel axle is defined as a reference plane, the two endpoints of the first intersection line are respectively used as tangent points to form a first tangent and a second tangent with the first intersection line, the angle formed between the first tangent and the reference plane is α, where 10°≤α≤20°, and the angle formed between the second tangent and the reference plane is β, where 45°≤β≤60°.

[0012] As a preferred embodiment, the first intersection line includes a first arc segment and a second arc segment that are externally connected, the tangent point of the first tangent line is located at the endpoint of the first arc segment, the tangent point of the second tangent line is located at the endpoint of the second arc segment, the radius of the first arc segment is 10-15mm, and the radius of the second arc segment is 20-25mm.

[0013] As a preferred embodiment, the second intersection line is a curve, and the second intersection line includes an inscribed third arc segment and a fourth arc segment, the first arc segment and the third arc segment are located on the same side of the fan blade, the radius of the third arc segment is 8-15mm, and the radius of the fourth arc segment is 50-60mm.

[0014] As a preferred embodiment, each of the fan blades includes an arc connecting section, a blade arc section, a blade outer circle section and a blade curved surface section which are connected in sequence. The fan blade is connected to the outer wall of the wheel axle through the arc connecting section. The arc connecting section and the blade outer circle section are arranged relatively to each other. The arc connecting section, the blade arc section, the blade outer circle section and the blade curved surface section constitute the fishtail-shaped fan blade.

[0015] As a preferred solution, the ratio between the radius R1 of the blade outer circular segment and the radius R2 of the arc connecting segment is 2-3, and an angle θ is formed between the blade arc segment and the arc connecting segment, wherein 65°≤θ≤80°.

[0016] As a preferred solution, the number of the fan blades is 4-9.

[0017] As a preferred embodiment, it also includes an evaporator, and the fan device and the evaporator are arranged side by side on the outside of the storage chamber, and the fan device is connected to the outside of the storage chamber through the fan bracket, and the ratio between the thickness value of the fan bracket and the length value of the fan bracket is 1:5.

[0018] As a preferred embodiment, a support platform is provided in the middle of the fan bracket, and the fan bracket is provided with a receiving groove for accommodating the wheel axle, the support platform is provided with a through hole, a rotating shaft is rotatably passed through the through hole, and the wheel axle is arranged in the receiving groove through the rotating shaft.

[0019] As a preferred embodiment, the fan device also includes an annular magnet, a coil seat, a stator coil and a power cord for supplying power to the stator coil, the coil seat is fixedly connected to the support platform, the stator coil is installed on the coil seat, the power cord is connected to the stator coil, the annular magnet is sleeved on the outer wall of the coil seat and arranged in the wheel axle, and the rotating shaft is sequentially penetrated through the through hole and the coil seat and connected to the wheel axle.

[0020] As a preferred solution, a plurality of support rods are arranged on the periphery of the support platform, and both ends of each of the support rods are respectively connected to the support platform and the fan bracket, and a buckle for fixing a power cord is arranged on one of the support rods.

[0021] Implementing the embodiments of the present invention has the following beneficial effects:

[0022] The blades of the fan device are bent from the second intersection line toward the first intersection line. In this embodiment, the side of the fan blade facing the second intersection line is the outer side of the fan blade, and the side of the fan blade facing the first intersection line is the inner side of the fan blade, that is, the fan blade is bent from its outer side toward its inner side. The use of a bent blade structure can enable the fan blade to provide more sufficient air volume when rotating, thereby reducing the volume of the fan device while ensuring the air volume in the air duct. Further, the end face of the wheel shaft is defined as the reference plane, and the first intersection line formed by the inner side of the fan blade and the wheel shaft, and the two end points of the first intersection line correspond to The angles α and β between the first tangent and the second tangent and the reference plane are respectively 10°≤α≤20°, 45°≤β≤60°. The fan blades using this angle range can minimize the length of the wheel axle while meeting the air volume requirement, and correspondingly reduce the thickness of the entire fan device. Based on the above fan device, the isolation panel can be set as a flat panel, so that the processing cost of the isolation panel is low and does not affect the storage capacity of the goods in the storage room, that is, the storage capacity of the goods in the low-temperature storage device is increased within a limited size, thereby improving the competitiveness of the low-temperature storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure between the fan device and the isolation panel in the prior art.

[0024] Figure 2 Schematic diagram of the structure between the fan device and the isolation panel in an embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the structure of a low-temperature storage device in an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the structure of the fan device in an embodiment of the present invention.

[0027] Figure 5 FIG. 4 is a plan view of a fan device according to an embodiment of the present invention.

[0028] Figure 6 FIG. 4 is an exploded view of a fan device according to an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the structure between the fan blades and the wheel axle in an embodiment of the present invention.

[0030] Figure 8 Schematic diagram of the structure of the fan blade in an embodiment of the present invention.

[0031] Fig. 9 It is a plan view of the connection between the fan blades and the wheel axle in an embodiment of the present invention.

[0032] Fig.10 This is a schematic diagram of the structure for verifying the number of fan blades in an embodiment of the present invention.

[0033] Fig.11 It is a schematic diagram of air volume simulation of a low-temperature storage device corresponding to a set of data of a fan device in an embodiment of the present invention.

[0034] In the figure: 100, main body; 1, storage room; 2, bottled wine; 3, air duct; 4, isolation panel; 41, avoidance groove; 5, fan device; 51, fan bracket; 51a, support platform; 51b, support rod; 52, axle; 53, fan blade; 53a, arc connecting section; 53b, blade arc section; 53c, blade outer circle section; 53d, blade curved surface section; 54, annular magnet; 55, coil seat; 56, stator coil; 57, power cord; 58, rolling bearing; 59, spring; 510, rotating shaft; 511, buckle; 6, first intersection line; 61, first arc segment; 62, second arc segment; 7, second intersection line; 71, third arc segment; 72, fourth arc segment; 8, evaporator. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0037] like Figures 2 to 11 As shown, this embodiment provides a low-temperature storage device, including:

[0038] A main body 100, wherein the main body 100 has at least one storage chamber 1, and the storage chamber 1 in this embodiment is mainly used for storing bottled wine 2;

[0039] A cold air supply device, wherein the cold air supply device is configured to supply cold air to the storage chamber 1 so as to keep the storage chamber 1 at a predetermined temperature. It should be noted that the cold air supply device is an existing design in a refrigerator, for example, a cooling cycle is adopted to supply cold air, and the storage space is kept at a predetermined temperature or within a predetermined temperature range. Exemplarily, the cold air supply device may include a compressor, an expansion valve, an evaporator 8 and a condenser. The evaporator 8 is a device for conveying cold air, in which the refrigerant absorbs the heat of the cooled object to realize refrigeration, and the compressor plays the role of inhaling, compressing and conveying the refrigerant vapor. The above devices cooperate to complete the supply of cold air to the refrigerator; and

[0040] The fan device 5 is configured to guide the cold air generated by the cold air supply device into the storage space of the storage chamber 1. Specifically, in this embodiment, the low-temperature storage device is used to store bottled wine, that is, the low-temperature storage device is exemplified as a refrigerator wine cabinet, but it can also be used to store other goods. The refrigerator wine cabinet is provided with an air duct 3. The air duct 3 is a channel for the circulation of cold air surrounded by a chamber in the main body 100 and an isolation panel 4. The fan device 5 is arranged in the air duct 3, and the isolation panel 4 is arranged between the air duct 3 and the storage chamber 1. It should be pointed out that in this embodiment, due to the fan device The thickness of the fan device 5 is thin, so that the isolation panel 4 can be a flat panel structure, and there is no need to set the avoidance groove 41 on the isolation panel 4 to meet the setting of the fan device 5. At the same time, the flat panel structure makes the isolation panel 4 low in cost and easy to process. However, this embodiment is only one implementation method, and there can be many specific settings of the isolation panel 4. However, compared with the existing isolation panel 4, since the thickness of the fan device 5 is thin, there is no need to set a large avoidance groove 41 to meet the setting of the fan device 5. The isolation panel 4 in this embodiment has a simpler structure and is more convenient to process and produce.

[0041] Wherein, the fan device 5 comprises:

[0042] A fan bracket 51, a wheel shaft 52 rotatably disposed in the middle of the fan bracket 51, and a plurality of fan blades 53 arranged in an array on the periphery of the wheel shaft 52;

[0043] In any of the fan blades 53, the intersection of the fan blade 53 and the side wall of the wheel shaft 52 forms a first intersection line 6 and a second intersection line 7, the first intersection line 6 is a curve, and the fan blade 53 is bent from the second intersection line 7 toward the first intersection line 6. In this embodiment, the side of the fan blade 53 facing the second intersection line 7 is the outer side of the fan blade 53, and the side of the fan blade 53 facing the first intersection line 6 is the inner side of the fan blade 53, that is, the fan blade 53 is bent from its outer side toward its inner side. The curved fan blade 53 structure can provide more sufficient air volume when the fan blade 53 rotates, thereby ensuring the air volume in the air duct 3 while reducing the volume of the fan device 5. The end face of the wheel shaft 52 is defined as a reference plane, and the two endpoints of the first intersection line 6 are respectively used as tangent points to form a first tangent with the first intersection line 6. line and a second tangent line, an angle α formed between the first tangent line and the reference plane, wherein 10°≤α≤20°, an angle β formed between the second tangent line and the reference plane, wherein 45°≤β≤60°, since the reference plane is located on an end face of the fan device 5, and the length direction of the axle 52 is the thickness direction of the fan device 5, the fan blades 53 set at the above angles can minimize the length of the axle 52 while meeting the air volume requirement, and correspondingly reduce the thickness of the entire fan device 5, based on the above fan device 5, the isolation panel 4 can be set as a flat panel, thereby not affecting the storage capacity of the bottled wine 2 in the storage chamber 1, that is, increasing the storage capacity of the bottled wine 2 within a limited size, meeting the large-capacity storage requirement of the low-temperature storage device, and improving the competitiveness of the low-temperature storage device.

[0044] Based on the above technical solution, the fan blade 53 of the fan device 5 is bent from the second intersection line 7 toward the first intersection line 6. In this embodiment, the side of the fan blade 53 facing the second intersection line 7 is the outer side of the fan blade 53, and the side of the fan blade 53 facing the first intersection line 6 is the inner side of the fan blade 53, that is, the fan blade 53 is bent from its outer side toward its inner side. The curved fan blade 53 structure can provide more sufficient air volume when the fan blade 53 rotates, thereby ensuring the air volume in the air duct 3 while reducing the volume of the fan device 5. Further, the end face of the wheel shaft 52 is defined as the reference plane, and the inner side of the fan blade 53 and the first wheel shaft 52 form a reference plane. The intersection line, the first tangent line and the second tangent line corresponding to the two end points of the first intersection line respectively have an angle α and an angle β with the reference plane, wherein 10°≤α≤20°, 45°≤β≤60°. The fan blade 53 using this angle range can minimize the length of the axle 52 while meeting the air volume requirement, and correspondingly reduce the thickness of the entire fan device 5. Based on the above-mentioned fan device 5, the isolation panel 4 can be set as a flat panel, so that the processing cost of the isolation panel 4 is low, and does not affect the storage capacity of goods in the storage room, that is, the storage capacity of goods in the low-temperature storage device is increased within a limited size, thereby improving the competitiveness of the low-temperature storage device.

[0045] In this embodiment, the first intersection line 6 includes a first arc segment 61 and a second arc segment 62 which are connected externally, the tangent point of the first tangent line is located at the end point of the first arc segment 61, and the tangent point of the second tangent line is located at the end point of the second arc segment 62, the radius of the first arc segment 61 is 10-15 mm, and the radius of the second arc segment 62 is 20-25 mm. Further, the second intersection line 7 is a curve, and the second intersection line 7 includes a third arc segment 71 and a fourth arc segment 72 which are connected internally, the first arc segment 61 and the third arc segment 71 are located on the same side of the fan blade 53, the radius of the third arc segment 71 is 8-15 mm, and the radius of the fourth arc segment 72 is 50-60 mm. Preferably, the radius of the first arc segment 61 is 12.4 mm, the radius of the second arc segment 62 is 23.2 mm, the radius of the third arc segment 71 is 10 mm, and the radius of the fourth arc segment 72 is 57.7 mm. The use of the above-mentioned first intersection line 6 and second intersection line 7 makes the intersection between the fan blade 53 and the wheel axle 52 a continuous curve. Compared with the use of an oblique intersection, the curved surface of the fan blade 53 in this embodiment can facilitate wind guidance, thereby making the wind guiding effect of the fan device 5 good. It should be pointed out that the fan blades 53 corresponding to the above-mentioned numerical values ​​are a specific group of fan blades 53, which meet the size requirements of the fan device 5 of the low-temperature storage device and realize the maximum storage of the bottled wine 2 of the low-temperature storage device.

[0046] Specifically, each of the fan blades 53 includes an arc connecting section 53a, a blade arc section 53b, a blade outer circle section 53c and a blade curved surface section 53d which are connected in sequence. The fan blade 53 is connected to the outer wall of the wheel shaft 52 through the arc connecting section 53a. The arc connecting section 53a and the blade outer circle section 53c are arranged relatively to each other. The arc connecting section 53a, the blade arc section 53b, the blade outer circle section 53c and the blade curved surface section 53d constitute the fishtail-shaped fan blade 53. With the above-mentioned fan blade 53 structure, when the fan blade 53 rotates, the wind flow can be guided along the blade arc section 53b and the blade curved surface section 53d to avoid the wind flow directly colliding with the fan blade 53 to generate noise, thereby reducing the noise of the fan device 5 and the low-temperature storage device.

[0047] Furthermore, the ratio between the radius R1 of the blade outer circular segment 53c and the radius R2 of the arc connecting segment 53a is 2-3, preferably, the ratio of R1 to R2 is 2.44, and an angle θ is formed between the blade arc segment 53b and the arc connecting segment 53a, wherein 65°≤θ≤80°, and the preferred value of θ is 77°, thereby ensuring that the air flow of the fan device 5 is maximized. It should be pointed out that after combining the multiple sets of values ​​selected in this embodiment, the energy efficiency of the fan is simulated, and it is further verified that the fan device 5 with the above values ​​is thin and light, thereby meeting the fan installation requirements of the low-temperature storage device, and the air flow of the fan device 5 meets the performance requirements of the low-temperature storage device. One set of simulation diagrams is shown in FIG. Fig.11 shown.

[0048] The number of the fan blades 53 is 4-9, preferably 7 in this embodiment. By testing the relationship between the fan device 5 and the number of the fan blades 53 in this embodiment, as shown in FIG. Fig.10 As shown, the maximum wind volume can be achieved when the number of blades is 7 and they are evenly arranged on the outer circumference of the wheel shaft 52.

[0049] In addition, the low-temperature storage device also includes an evaporator 8, which is arranged in the air duct 3. The evaporator 8 is a part of the cold air supply device, and the specific working principle is not repeated here. The fan device 5 and the evaporator 8 are arranged side by side on the outside of the storage chamber, and the fan device is connected to the outside of the storage chamber through the fan bracket. In this embodiment, the fan device 5 and the evaporator 8 are arranged side by side on the isolation panel 4, so that the arrangement structure of the evaporator 8 and the fan device 5 in the air duct 3 is stable. The fan device 5 is connected to the isolation panel 4 through the fan bracket 51. The ratio between the thickness value of the fan bracket 51 and the length value of the fan bracket 51 is 1:5, so as to ensure that the air guide volume of the fan device 5 meets the performance requirements of the low-temperature storage device, and can make the isolation panel 4 a flat panel structure, meet the large-capacity storage requirements of the low-temperature storage device, and improve the competitiveness of the low-temperature storage device.

[0050] In this embodiment, a support platform 51a is provided in the middle of the fan bracket 51, and the fan bracket 51 is provided with a receiving groove for accommodating the wheel axle 52, the support platform 51a is provided with a through hole, and a rotating shaft 510 is rotatably passed through the through hole, and the wheel axle 52 is arranged in the receiving groove through the rotating shaft 510, and the fan blades 53 and the wheel axle 52 are arranged in the receiving groove, and the rotation of the wheel axle 52 drives the wheel axle 52 and the fan blades 53 to rotate, so that the fan device 5 can operate stably.

[0051] Furthermore, the fan device 5 also includes an annular magnet 54, a coil seat 55, a stator coil 56 and a power cord 57 for supplying power to the stator coil 56. The coil seat 55 is fixedly connected to the support platform 51a, the stator coil 56 is installed on the coil seat 55, the power cord 57 is connected to the stator coil 56, the annular magnet 54 is sleeved on the outer wall of the coil seat 55 and is arranged in the wheel shaft 52, and the rotating shaft 510 is sequentially penetrated through the through hole, the coil seat 55, and the stator coil 56. The seat 55 is connected to the wheel axle 52. After the power supply is connected, the stator coil 56 generates an induced electromotive force after being energized by the power line 57, and generates an electromagnetic torque after acting as a rotating magnetic field to rotate the wheel axle 52. The rotating shaft 510 makes the rotation of the wheel axle 52 more stable and plays a role in installation. Specifically, in this embodiment, a rotating shaft 510 bearing is provided on the rotating shaft 510, thereby reducing the rotation friction and improving the energy efficiency conversion. The spring 59 is provided on the rotating shaft 510 to make the installation structure of the wheel axle 52 more stable. It should be pointed out that this embodiment exemplarily gives a solution of using electromagnetic induction to rotate the fan blades 53, but there are multiple ways to drive the fan blades 53 in the fan device 5, such as directly using the motor shaft to drive the fan blades 53 to rotate, and the setting form in this embodiment shares the power supply of the low-temperature storage device, and further reduces the thickness of the fan device 5, thereby meeting the setting requirements of the low-temperature storage device.

[0052] In order to ensure that the power cord 57 is stably set, a plurality of support rods 51b are arranged on the periphery of the support platform 51a, and the two ends of each support rod 51b are respectively connected to the support platform 51a and the fan bracket 51, and one of the support rods 51b is provided with a buckle 511 for fixing the power cord 57. On the one hand, the support rod 51b enables the support platform 51a to be set in the middle of the fan bracket 51, and on the other hand, it realizes the fixation and positioning of the power cord 57. The corresponding support rod 51b is provided with a wire groove structure, so as to further fix the power cord 57 firmly, avoid the power cord 57 from falling off during assembly and transportation, and further avoid the power cord 57 from getting stuck in the fan blades 53, thereby causing the fan device 5 to generate loud noise or even fail to operate.

[0053] In the low-temperature storage device of the embodiment of the present invention, the fan blade 53 of the fan device 5 is bent from the second intersection line 7 toward the first intersection line 6. In this embodiment, the side of the fan blade 53 facing the second intersection line 7 is the outer side of the fan blade 53, and the side of the fan blade 53 facing the first intersection line 6 is the inner side of the fan blade 53, that is, the fan blade 53 is bent from its outer side toward its inner side. The bent fan blade 53 structure can provide more sufficient air volume when the fan blade 53 rotates, thereby ensuring the air volume in the air duct 3 while reducing the volume of the fan device 5. Further, the end face of the wheel shaft 52 is defined as the reference plane, and the inner side of the fan blade 53 forms a reference plane with the wheel shaft 52. The first intersection line, the first tangent line and the second tangent line corresponding to the two end points of the first intersection line respectively have an angle α and an angle β with the reference plane, wherein 10°≤α≤20°, 45°≤β≤60°. The fan blade 53 using this angle range can minimize the length of the axle 52 while meeting the air volume requirement, and correspondingly reduce the thickness of the entire fan device 5. Based on the above-mentioned fan device 5, the isolation panel 4 can be set to a flat panel, so that the processing cost of the isolation panel 4 is low, and does not affect the storage capacity of the goods in the storage room, that is, the storage capacity of the goods in the low-temperature storage device is increased within a limited size, thereby improving the competitiveness of the low-temperature storage device.

[0054] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A low temperature storage device, characterized in that: include: a main body having at least one storage chamber; a cold air supply device configured to supply cold air to the storage chamber; as well as a fan device configured to guide the cold air generated by the cold air supply device into the storage space of the storage chamber, wherein the fan device comprises: A fan bracket, a wheel shaft rotatably arranged in the middle of the fan bracket, and a plurality of fan blades arranged in an array on the periphery of the wheel shaft; In any of the fan blades, the intersection of the fan blade and the side wall of the wheel shaft forms a first intersection line and a second intersection line, the first intersection line is a curve, the fan blade is bent from the second intersection line toward the first intersection line, the end face of the wheel shaft is defined as a reference plane, the two end points of the first intersection line are used as tangent points to form a first tangent line and a second tangent line with the first intersection line, the angle formed between the first tangent line and the reference plane is α, where 10°≤α≤20°, and the angle formed between the second tangent line and the reference plane is β, where 45°≤β≤60°; The first intersection line includes a first arc segment and a second arc segment that are externally connected, the tangent point of the first tangent line is located at the endpoint of the first arc segment, and the tangent point of the second tangent line is located at the endpoint of the second arc segment; Each of the fan blades includes an arc connecting section, a blade arc section, a blade outer circle section and a blade curved surface section which are connected in sequence. The fan blade is connected to the outer wall of the wheel shaft through the arc connecting section. The arc connecting section and the blade outer circle section are arranged opposite to each other. The arc connecting section, the blade arc section, the blade outer circle section and the blade curved surface section constitute the fishtail-shaped fan blade.

2. The low temperature storage device according to claim 1, characterized in that: The radius of the first arc segment is 10-15 mm, and the radius of the second arc segment is 20-25 mm.

3. The low temperature storage device according to claim 2, characterized in that: The second intersection line is a curve, and the second intersection line includes an inscribed third arc segment and a fourth arc segment, the first arc segment and the third arc segment are located on the same side of the fan blade, the radius of the third arc segment is 8-15mm, and the radius of the fourth arc segment is 50-60mm.

4. The low temperature storage device according to claim 1, characterized in that: The ratio between the radius R1 of the outer circular segment of the blade and the radius R2 of the arc connecting segment is 2-3, and an angle θ is formed between the blade arc segment and the arc connecting segment, wherein 65°≤θ≤80°.

5. The low temperature storage device according to claim 1, characterized in that: The number of the fan blades is 4-9.

6. The low temperature storage device according to claim 1, characterized in that: It also includes an evaporator, the fan device and the evaporator are arranged side by side on the outside of the storage chamber, the fan device is connected to the outside of the storage chamber through the fan bracket, and the ratio between the thickness value of the fan bracket and the length value of the fan bracket is 1:

5.

7. The low temperature storage device according to claim 1, characterized in that: A support platform is provided in the middle of the fan bracket, and the fan bracket is provided with a receiving groove for receiving the wheel axle, the support platform is provided with a through hole, a rotating shaft is rotatably passed through the through hole, and the wheel axle is arranged in the receiving groove through the rotating shaft.

8. The low temperature storage device according to claim 7, characterized in that: The fan device also includes an annular magnet, a coil seat, a stator coil and a power cord for supplying power to the stator coil. The coil seat is fixedly connected to the support platform, the stator coil is installed on the coil seat, the power cord is connected to the stator coil, the annular magnet is sleeved on the outer wall of the coil seat and arranged in the wheel axle, and the rotating shaft is sequentially penetrated through the through hole and the coil seat and connected to the wheel axle.

9. The low temperature storage device according to claim 7, characterized in that: A plurality of support rods are arranged on the periphery of the support platform, and two ends of each of the support rods are respectively connected to the support platform and the fan bracket, and a buckle for fixing a power cord is arranged on one of the support rods.

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