A refrigerator

Abstract

The present invention relates to the technical field of refrigeration equipment, and discloses a refrigerator, which includes a box body, a refrigerant pipe and an ice-making unit; the ice-making unit includes a base, a fan assembly, an ice-making grid and an ice-making evaporation pipe; the fan assembly is arranged at the bottom of the base, the rear side thereof is the air suction side, and the front side or the lower side or the side thereof is the air outlet side; the ice-making grid is connected to the base or the fan assembly and is located on the air suction side; the ice-making evaporation pipe is a micro-channel flat pipe with a plurality of flow channels and dense small holes inside, and the micro-channel flat pipe is bent into a shape with an inner cavity; the upper surface of the ice-making evaporation pipe is attached to the bottom surface of the ice-making grid, and the inner cavity corresponds to the air suction port of the fan assembly, so that the air passes through the inner cavity during air circulation. The contact area between the ice-making evaporation pipe and the ice-making grid of the present invention is large, which improves the heat exchange efficiency of ice-making. Moreover, the inner cavity serves as a circulating air cavity, effectively increasing the heat exchange surface, thereby improving the air circulation heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and particularly to a refrigerator. Background Art

[0002] Refrigerators with an ice-making function are becoming increasingly popular among consumers. Ice-making is achieved through an ice maker inside the refrigerator. The refrigerant pipe of the refrigerator's refrigeration unit provides cold energy to the ice-making grid, causing the water injected into the ice-making grid to freeze.

[0003] Some existing refrigerators are provided with an independent ice-making chamber. The ice maker is arranged in the ice-making chamber, and then a part of the pipe section of the refrigerant pipe extends into the ice-making chamber to directly contact the ice-making grid, so as to more efficiently directly utilize the cold energy and thus improve the ice-making efficiency.

[0004] However, in the above solution, the contact area between the refrigerant pipe and the ice-making grid is small, and the improvement of the ice-making efficiency is limited. Moreover, the air circulation in the ice-making chamber is not good, resulting in a temperature difference everywhere in the ice-making chamber, which easily causes problems such as frosting of the ice-making components, adhesion or melting of the ice cubes in the ice storage container.

[0005] Therefore, the existing technology urgently needs to be improved. Summary of the Invention

[0006] The object of the present invention is to provide a refrigerator to solve the technical problems in the existing technology that the contact area between the refrigerant pipe and the ice-making grid in the refrigerator is small, the improvement of the ice-making efficiency is limited, and the air circulation in the ice-making chamber is not good, resulting in a temperature difference everywhere in the ice-making chamber, which easily causes frosting of the ice-making components, adhesion or melting of the ice cubes in the ice storage container.

[0007] To achieve the above object, the present invention provides a refrigerator, comprising:

[0008] A box body, which defines an ice-making chamber therein;

[0009] A refrigerant pipe, which is arranged in the box body and has a first interface and a second interface;

[0010] Wherein, an ice-making unit is further included;

[0011] The ice-making unit includes a base, a fan assembly, an ice-making grid and an ice-making evaporation pipe;

[0012] The base is detachably installed in the ice-making chamber;

[0013] The fan assembly is arranged at the bottom of the base, with its rear side being the air suction side and its front side or lower side or side being the air outlet side;

[0014] The ice-making grid is connected to the base or the fan assembly and is located at the air suction side;

[0015] The ice-making evaporation tube is a microchannel flat tube with multiple flow channels and dense small holes inside. The microchannel flat tube has an ice-making agent inlet and an ice-making agent outlet. The ice-making agent inlet is communicated with the first interface, and the ice-making agent outlet is communicated with the second interface. Moreover, the microchannel flat tube is bent into a shape with an inner cavity.

[0016] The upper surface of the ice-making evaporation tube is attached to the bottom surface of the ice-making grid, and the inner cavity corresponds to the air suction port of the fan assembly, so that the air circulates through the inner cavity.

[0017] In some embodiments of the present application, the contact surface between the ice-making evaporation tube and the ice-making grid is an arc surface.

[0018] In some embodiments of the present application, a heat-conducting material is filled between the contact surface of the ice-making evaporation tube and the ice-making grid.

[0019] In some embodiments of the present application, the ice-making evaporation tube and the ice-making grid are fixed by welding.

[0020] In some embodiments of the present application, the bottom surface of the ice-making grid is provided with a first engaging portion, and a second engaging portion cooperating with the first engaging portion is provided at the corresponding position on the upper surface of the ice-making evaporation tube, so that the upper surface of the ice-making evaporation tube is attached and connected to the bottom surface of the ice-making grid.

[0021] In some embodiments of the present application, fins are provided in the inner cavity.

[0022] In some embodiments of the present application, the cross-sectional shape of the ice-making evaporation tube is a "mouth" shape, and a slit extending along its length direction is provided at the bottom.

[0023] In some embodiments of the present application, the ice-making unit further includes a drainage plate; the drainage plate is located below the ice-making evaporation tube and is connected to the fan assembly or the base.

[0024] In some embodiments of the present application, the ice-making unit further includes a heating tube; the heating tube is arranged in the inner cavity and is located on both sides of the contact surface between the ice-making evaporation tube and the ice-making grid.

[0025] In some embodiments of the present application, a ice storage container is further included; the ice storage container is arranged in the ice-making chamber and is located below the ice-making unit.

[0026] Compared with the prior art, the beneficial effects of a refrigerator according to an embodiment of the present invention are as follows:

[0027] In the refrigerator according to the embodiment of the present invention, the ice-making evaporation tube in the ice-making unit is a microchannel flat tube with an inner cavity and a plurality of flow channels with dense small holes provided therein. The upper surface thereof forms a surface contact with the bottom surface of the ice-making grid, effectively increasing the contact area, improving the heat exchange efficiency of ice-making, thereby improving the ice-making capacity and reducing the ice-making energy consumption. Moreover, the inner cavity corresponds to the air suction port of the fan assembly, that is, the inner cavity serves as a circulating air cavity, and the surrounding of the air cavity is a heat exchange surface, effectively increasing the heat exchange surface, thereby improving the heat exchange efficiency of air circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 is a schematic structural diagram of the ice-making chamber in the embodiment of the present invention;

[0030] Figure 2 is an exploded structural diagram of the ice-making unit;

[0031] Figure 3 is an assembled structural diagram of the ice-making unit;

[0032] Figure 4 is a longitudinal sectional structural diagram of the ice-making unit;

[0033] Figure 5 is a cross-sectional structural diagram of the ice-making unit;

[0034] Figure 6 is a structural diagram of the ice-making evaporation tube;

[0035] Figure 7 is a cross-sectional structural diagram when the ice-making evaporation tube is laid flat;

[0036] Figure 8 is a schematic diagram of the air circulation of the ice-making unit;

[0037] Figure 9 is a partial cross-sectional structural diagram of the ice-making unit in another embodiment;

[0038] Figure 10 is Figure 9 a schematic structural diagram of the ice-making grid in the embodiment;

[0039] 100, Ice-making unit; 110, Base; 120, Fan assembly; 130, Ice-making grid; 131, First engaging portion; 140, Ice-making evaporation tube; 141, Ice-making agent inlet; 142, Ice-making agent outlet; 143, Inner cavity; 144, Gap; 145, Second engaging portion; 150, Heating tube; 160, Drainage plate; 170, Ice-turning rod assembly; 200, Ice storage container. Detailed implementation manner

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0042] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0043] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] A refrigerator according to a preferred embodiment of the present invention mainly includes a box body, a box door, a refrigeration cycle system, an ice-making unit 100, and an ice storage container 200.

[0045] Specifically, a refrigerating chamber and a freezing chamber can be defined inside the box body, and the box door is used to open and close the refrigerating chamber and the freezing chamber. Among them, an independent ice-making chamber is defined through a heat-insulating shell inside the refrigerating chamber or the freezing chamber, or the freezing chamber is used as the ice-making chamber.

[0046] The refrigeration cycle system at least includes a refrigerant pipe and a compressor, a condenser, a valve, and an evaporator connected to the refrigerant pipe. The refrigerant flowing through the refrigerant pipe is sent out by the compressor and then passes through the condenser, and its on-off is controlled by the valve, so as to selectively flow through the evaporator or the pipe section corresponding to the ice-making chamber, and heat exchange is carried out through expansion to cool the corresponding space reached. The connection and working principle of the components of the refrigeration cycle system of the refrigerator belong to the prior art and will not be elaborated in this application. In this application, the refrigerant pipe corresponding to the ice-making chamber has a first interface and a second interface (not shown in the figure).

[0047] See Figure 1 , Figure 1 is a schematic internal view of the ice-making chamber. The ice-making unit 100 is arranged inside the ice-making chamber, and the ice storage container 200 is also arranged inside the ice-making chamber and is located below the ice-making unit 100 for receiving the ice cubes falling from the ice-making unit 100.

[0048] See Figure 2 -7, Figure 2 is an exploded structural view of the ice-making unit 100, Figure 3 is an assembled structural view of the ice-making unit 100, Figure 4 is a longitudinal section (section along its length) structural view of the ice-making unit 100, Figure 5 is a cross-section (section along its width) structural view of the ice-making unit 100, Figure 6 is a structural view of the ice-making evaporation pipe, Figure 7 is a cross-sectional structural view when the ice-making evaporation pipe is laid flat.

[0049] The ice-making unit 100 includes a base 110, a fan assembly 120, an ice-making grid 130, an ice-making evaporation pipe 140, a heating pipe 150, a drainage plate 160, and a ice-turning rod assembly 170.

[0050] The base 110 is detachably installed inside the ice-making chamber. The fan assembly 120 is arranged at the bottom of the base 110, its rear side is the air suction side, and its front side or downward side or sideward side is the air outlet side. In this embodiment, the air outlet side of the fan assembly 120 is downward.

[0051] The ice-making grid 130 is connected to the base 110 or the fan assembly 120 and is located on the air suction side. The base 110 is provided with a water injection hole so that an external water pipe can inject water into the ice-making grid 130.

[0052] See Figure 6 andFigure 7 , the ice-making evaporation tube 140 is a micro-channel flat tube with multiple flow channels and dense small holes inside. The micro-channel flat tube has an ice-making agent inlet 141 and an ice-making agent outlet 142. The ice-making agent inlet 141 is communicated with the first interface of the refrigerant tube, and the ice-making agent outlet 142 is communicated with the second interface of the refrigerant tube. Moreover, the micro-channel flat tube is bent into a shape with an inner cavity 143, and its cross-sectional shape is similar to a "mouth" shape that is wider at the top and narrower at the bottom, as Figure 5 shown. In this embodiment, a micro-channel flat tube with a preferred size is provided, and its schematic cross-sectional structure diagram is as Figure 7 shown.

[0053] See Figure 5 , the bottom surface of the ice-making grid 130 is an arc-shaped surface protruding downward, and the upper surface of the ice-making evaporation tube 140 is also an arc-shaped surface, which fits with the bottom surface of the ice-making grid 130, so that the contact surface between the two is an arc-shaped surface. The length of the ice-making evaporation tube 140 is similar to the length of the ice-making grid 130 to increase the contact area between the two. A heat-conducting material (not shown in the figure) is filled between the contact surfaces of the ice-making evaporation tube 140 and the ice-making grid 130. Preferably, heat-conducting silica gel is filled to help maintain good contact. The ice-making evaporation tube 140 and the ice-making grid 130 are fixed by welding. The welding position is preferably at the edge of the contact surface between the two, so that the ice-making evaporation tube 140 and the ice-making grid 130 are integrated to ensure the contact tightness between the two. Both the ice-making grid 130 and the ice-making evaporation tube 140 are made of aluminum material, and the two are aluminum-aluminum welded.

[0054] The inner cavity 143 of the ice-making evaporation tube 140 corresponds to the air inlet of the fan assembly 120, so that the air circulates through the inner cavity 143 when the fan assembly 120 blows air downward. When the lower side of the fan assembly 120 is the air outlet side, the air circulation path in the ice-making chamber is as Figure 8 shown, and the arrow indicates the wind direction.

[0055] See Figure 5 and Figure 6 , a plurality of fins 180 are provided in the inner cavity 143 of the ice-making evaporation tube 140. The fins 180 are specifically arranged on the upper cavity wall of the inner cavity 143 and are parallel to the length direction of the ice-making evaporation tube 140, so that they are consistent with the air circulation direction. Moreover, the plurality of fins 180 are arranged at intervals along the transverse direction of the ice-making evaporation tube 140, which is equivalent to forming a plurality of heat exchange air ducts in the inner cavity 143, further strengthening the heat exchange between the ice-making evaporation tube 140 and the circulating air in the ice-making chamber. Those skilled in the art should understand that the fins 180 are not limited to being arranged in the quantity and arrangement manner of this embodiment.

[0056] See Figure 6, a gap 144 extending along the length direction is provided at the bottom of the ice-making evaporation tube 140, and the defrosting water of the fins 180 in the ice-making evaporation tube 140 can flow downward from the gap 144. Pipes are provided on both sides of the gap 144, and the ports of the pipes on both sides are respectively an ice-making agent inlet 141 and an ice-making agent outlet 142.

[0057] See Figure 2 , a drain plate 160 is located below the ice-making evaporation tube 140 and is connected to the fan assembly 120 or the base 110, and is used to catch the defrosting water flowing out from the gap 144 and has an inclined surface to export the defrosting water out of the ice-making chamber.

[0058] See Figure 5 , a heating tube 150 is arranged in the inner cavity 143 and is located on both sides of the contact surface between the ice-making evaporation tube 140 and the ice-making grid 130, and is used to heat the bottom of the ice-making grid 130 to melt the bottom of the ice cube for subsequent ice removal.

[0059] See Figure 5 , a turning ice rod assembly 170 is arranged above the ice-making grid 130, and it can turn out the ice cubes in the ice-making grid 130 through rotational movement so that the ice cubes can fall into the ice storage container 200.

[0060] A control unit (not shown in the figure) is arranged in the base 110. Both the turning ice rod assembly 170 and the fan assembly 120 are electrically connected to the control unit, and the control unit is used to control the opening and closing of the fan assembly 120 and the rotational movement of the turning ice rod assembly 170. See Figure 2 , the fan assembly 120 mainly includes a fan and a housing, and the specific structural forms of the base 110 and the housing can be designed according to actual needs.

[0061] In some embodiments of the present application, see Figure 9 -10, Figure 9 is a schematic cross-sectional structure diagram at the ice-making grid 130 and the ice-making evaporation tube 140 of the ice-making unit. The bottom surface of the ice-making grid 130 is provided with a first engaging portion 131, and a second engaging portion 145 cooperating with the first engaging portion 131 is provided at the corresponding position on the upper surface of the ice-making evaporation tube 140, so that the upper surface of the ice-making evaporation tube 140 is fitted and connected to the bottom surface of the ice-making grid 130. Specifically, the first engaging portion 131 is a wedge-shaped block, and the second engaging portion 145 is a wedge-shaped groove. Those skilled in the art should understand that the structures of the first engaging portion 131 and the second engaging portion 145 are not limited to the above-mentioned wedge-shaped mating structure, and can also be assembled by means of buckles, hooks or guide rails, etc. to form a reliable fitting connection.

[0062] In summary, a refrigerator proposed by the present invention has at least the following beneficial effects:

[0063] First, it increases the contact area between the ice-making evaporation pipe 140 and the ice-making grid 130, improves the heat exchange efficiency, thus enhancing the ice-making capacity of the ice-making unit 100 and reducing the ice-making energy consumption.

[0064] The ice-making evaporation pipe 140 of this application is a microchannel flat pipe with multiple flow channels and dense small holes, significantly increasing the convective heat transfer inside the pipe. Moreover, the ice-making evaporation pipe 140 is bent into a special shape, and its upper surface fits with the bottom surface of the ice-making grid 130, achieving large-area contact, effectively increasing the heat exchange area, and thus improving the heat exchange efficiency.

[0065] Compared with the existing U-shaped ice-making evaporation pipe solution, when the length dimension of the ice-making grid remains unchanged, the contact area between the ice-making evaporation pipe 140 and the ice-making grid 130 in this application is 2 - 3 times that between the U-shaped ice-making evaporation pipe and the ice-making grid 130.

[0066] When adopting the U-shaped ice-making evaporation pipe solution, due to the small contact area between the U-shaped ice-making evaporation pipe and the ice-making grid, in order to make up for the defect of insufficient heat exchange area, it is necessary to sacrifice the heat exchange temperature difference. During the actual ice-making process, it is necessary to lower the evaporation temperature of the U-shaped ice-making evaporation pipe to a relatively low temperature. However, if the evaporation temperature is too low, it will lead to a very low COP (refrigeration efficiency) of the whole machine, high power consumption, and problems such as door seal condensation easily occur. While the solution of this application overcomes the defect of small contact area, has high heat exchange efficiency, enables the ice-making unit 100 to have high ice-making efficiency, effectively improves the core competitiveness index of the 24-hour ice-making capacity, and has less ice-making energy consumption.

[0067] In another inventive concept, this application makes the contact surface between the ice-making evaporation pipe 140 and the ice-making grid 130 an arc surface, and their lengths are the same, so as to further increase the contact area and be beneficial to improving the heat exchange efficiency.

[0068] In another inventive concept, this application fills a heat-conducting material between the contact surfaces of the ice-making evaporation pipe 140 and the ice-making grid 130 to ensure full contact between the ice-making evaporation pipe 140 and the ice-making grid 130, effectively reducing the contact thermal resistance and being beneficial to improving the heat exchange efficiency.

[0069] Second, it increases the heat exchange surface of the circulating air cavity, improving the heat exchange efficiency of the air circulation in the ice-making chamber.

[0070] The ice-making evaporation pipe 140 of this application is bent into a shape with an inner cavity 143, and the inner cavity 143 corresponds to the air suction port of the fan assembly 120, that is, the inner cavity 143 serves as the circulating air cavity, and the surrounding of the air cavity is a heat exchange surface, effectively increasing the heat exchange surface and thus improving the air circulation heat exchange efficiency.

[0071] Generally, the volume of the ice storage box is limited. After ice making for a certain period of time, the ice storage box can be filled with ice. Therefore, in fact, the time to maintain the indoor temperature when the ice making chamber is full of ice or the ice making machine is turned off is much longer than the ice making time. Therefore, improving the heat exchange efficiency of the air circulation in the ice making chamber is even more practically significant than improving the ice making capacity. When the ice making chamber is full of ice or the ice making machine is turned off, the air circulation is required to transfer the cold of the ice making grid 130 / ice making evaporation pipe 140 to the lower ice storage container 200 to prevent the ice from melting and causing ice adhesion. If the heat exchange efficiency is low during air circulation, more work of the compressor needs to be consumed to maintain the temperature in the ice making chamber, resulting in a significant decrease in the overall efficiency of the refrigerator. For the U-shaped ice making evaporation pipe solution, the air cavity formed by it and the evaporation pipe pressing plate has only the lower arc surface of the evaporation pipe as the only heat exchange surface, and other surfaces are all heat conducting surfaces, with relatively low heat exchange efficiency. However, for the ice making evaporation pipe 140 of the present application, the surrounding of the formed circulating air cavity is all heat exchange surfaces, the heat exchange area is increased by more than 4 times, and the heat exchange efficiency is greatly improved.

[0072] In another inventive concept, fins 180 are reasonably distributed in the inner cavity 143, which helps to further increase the heat exchange surface, thereby strengthening the heat exchange between the ice making evaporation pipe 140 and the circulating air in the ice making chamber, and ensuring that the ice storage container 200 is always in a reasonable low temperature environment.

[0073] Third, the assembly of the ice making evaporation pipe 140 and the ice making grid 130 is simplified, and the assembly efficiency and assembly quality are improved.

[0074] The ice making evaporation pipe 140 of the present application and the ice making grid 130 form an integrated structure by welding, or form a reliable fitting connection through assembly-friendly means such as wedge-shaped engaging parts, buckles, hooks or guide rails. This not only helps to ensure the contact tightness between the two, but also greatly simplifies the assembly difficulty, thereby improving the assembly efficiency and assembly quality.

[0075] For the U-shaped ice making evaporation pipe solution, generally, the U-shaped ice making evaporation pipe is first embedded in the installation groove at the bottom of the ice making grid. After pressing the U-shaped ice making evaporation pipe with a pressing plate, it is connected and fixed to the ice making grid by screws in the vertical direction, so as to press the U-shaped ice making evaporation pipe at the bottom of the ice making grid. The above solution has a large assembly difficulty, takes a long time, and has a low workshop assembly efficiency. Moreover, during transportation and assembly of the U-shaped ice making evaporation pipe, it is prone to twist and deform, resulting in the situation that although there is a pressing plate for locking, there is still poor contact between some local pipe sections and the ice making grid, with poor assembly quality, leading to problems such as reduced ice making efficiency and large temperature rise resistance in the ice storage chamber. The current solution can only be to strengthen the random inspection of the deformation of the U-shaped ice making evaporation pipe before assembly, but this cannot fundamentally solve the assembly quality problem. However, the assembly method of the ice making evaporation pipe 140 and the ice making grid 130 of the present application does not require screw fixation, reduces the assembly difficulty in the workshop, and improves the assembly efficiency and assembly quality.

[0076] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A refrigerator, comprising: A cabinet, within which an ice-making chamber is defined; A refrigerant pipe, which is arranged within the cabinet and has a first interface and a second interface; Characterized in that it further comprises an ice-making unit; The ice-making unit includes a base, a fan assembly, an ice-making grid and an ice-making evaporation pipe; The base is detachably mounted within the ice-making chamber; The fan assembly is arranged at the bottom of the base, with its rear side being the air suction side and its front side or lower side or lateral side being the air outlet side; The ice-making grid is connected to the base or the fan assembly and is located at the air suction side; The ice-making evaporation pipe is a micro-channel flat pipe with multiple flow channels and dense small holes inside. The micro-channel flat pipe has an ice-making agent inlet and an ice-making agent outlet. The ice-making agent inlet is communicated with the first interface, and the ice-making agent outlet is communicated with the second interface; and, the micro-channel flat pipe is bent into a shape with an inner cavity; The upper surface of the ice-making evaporation pipe is attached to the bottom surface of the ice-making grid, and the inner cavity corresponds to the air suction port of the fan assembly, so that the air circulates through the inner cavity.

2. The refrigerator according to claim 1, characterized in that, The contact surface between the ice-making evaporation pipe and the ice-making grid is an arc surface.

3. The refrigerator according to claim 1 or 2, characterized in that, A heat-conducting material is filled between the contact surface of the ice-making evaporation pipe and the ice-making grid.

4. The refrigerator according to claim 1 or 2, characterized in that, The ice-making evaporation pipe and the ice-making grid are fixed by welding.

5. The refrigerator according to claim 1 or 2, characterized in that, The bottom surface of the ice-making grid is provided with a first engaging portion, and a second engaging portion cooperating with the first engaging portion is provided at the corresponding position on the upper surface of the ice-making evaporation pipe, so that the upper surface of the ice-making evaporation pipe is attached and connected to the bottom surface of the ice-making grid.

6. The refrigerator according to claim 1, characterized in that, Fins are arranged in the inner cavity.

7. The refrigerator according to claim 1, characterized in that, The cross-sectional shape of the ice-making evaporation pipe is a "mouth" shape, and a slit extending along its length direction is provided at its bottom.

8. The refrigerator according to claim 1 or 7, characterized in that, The ice-making unit further includes a drainage plate; The drainage plate is located below the ice-making evaporation pipe and is connected to the fan assembly or the base.

9. The refrigerator according to claim 1 or 7, characterized in that, The ice-making unit further includes a heating pipe; The heating pipe is arranged in the inner cavity and is located on both sides of the contact surface between the ice-making evaporation pipe and the ice-making grid.

10. The refrigerator according to claim 1, wherein It further includes an ice storage container; The ice storage container is arranged within the ice-making chamber and is located below the ice-making unit.

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