Refrigeration appliance

Abstract

A refrigeration appliance comprises an inner shell used for limiting a storage space, an outer shell wrapping the inner shell, a heat insulation layer located between the inner shell and the outer shell, a first pipe, a second pipe and a water pipe, wherein at least parts of the first pipe and the second pipe are located in the heat insulation layer, and the water pipe is arranged in the first pipe and the second pipe in a penetrating mode. The first pipe is provided with a first end and a second end which are opposite to each other, the second pipe is provided with a connecting end, and the first end is hermetically connected with the connecting end; wherein a sealing convex rib protruding outwards is arranged on the peripheral face of the first pipe, and the sealing convex rib is closer to the first end than the second end and is used for being in close fit with the end portion of the connecting end to form a sealing structure after the first end is inserted into the connecting end. By means of the scheme, the better sealing effect can be achieved without additional auxiliary parts, environmental protection is achieved, and assembling operation is more labor-saving and efficient.

Description

TECHNICAL FIELD

[0001] The embodiments of the present disclosure relate to the technical field of refrigeration appliances, in particular to a refrigeration appliance. BACKGROUND

[0002] At present, some refrigeration appliances on the market, especially those with ice-making function, introduce water from the outside to the inside of the cabinet to meet the water demand. The water pipe located in the section of the heat insulation layer of the refrigeration appliance needs to be additionally sleeved with a protective pipe for protection. The connection between the protective pipes has sealing requirements to prevent the foaming heat insulation material from entering the pipeline from the connection to cause blockage.

[0003] A commonly used sealing method is to wrap multiple layers of sponge rubber tape at the connection, which does not meet the current green and environmentally friendly concept, and is also likely to cause complicated installation steps and require a considerable amount of time. Especially for refrigeration appliances equipped with complex ice-water systems, a large number of protective pipes are used. If multiple layers of sponge rubber tape are wrapped at each connection during the assembly of the cabinet to prevent leakage, the entire assembly process is quite complicated and requires a considerable amount of time. CONTENT OF THE UTILITY MODEL

[0004] One purpose of the embodiments of the present disclosure is to provide an improved refrigeration appliance.

[0005] Therefore, the embodiments of the present disclosure provide a refrigeration appliance, which includes an inner shell for defining a storage space, an outer shell wrapping the inner shell, a heat insulation layer located between the inner shell and the outer shell, a first pipe and a second pipe at least partially located in the heat insulation layer, and a water pipe passing through the first pipe and the second pipe. The first pipe has opposite first and second ends, and the second pipe has a connection end. The first end is sealingly connected to the connection end. The outer peripheral surface of the first pipe is provided with an outwardly protruding sealing protrusion. The sealing protrusion is closer to the first end than to the second end and is used to tightly fit with the end portion of the connection end after the first end is inserted into the connection end to form a sealing structure.

[0006] The embodiments of the present disclosure provide a sealing protrusion on the first pipe. After the first end of the first pipe is inserted into the connection end of the second pipe, the sealing protrusion and the end portion of the connection end are tightly fitted to form a sealing structure that seals the connection between the first pipe and the second pipe. In this way, no additional sealing member such as sponge rubber tape is needed to achieve sealing, which is green and environmentally friendly. Further, the first pipe is not limited by excessive resistance during insertion into the second pipe, so that the first pipe can be quickly inserted into place in a smoother and lower-wear state, and the assembly of the first pipe and the second pipe is more labor-saving and efficient. Further, after the first pipe is inserted into place, the sealing protrusion and the end portion of the connection end are tightly fitted to complete the sealing, which improves the sealing reliability.

[0007] Optionally, the sealing rib facing the first end is an arc surface or a sloped surface with a non-zero angle to the radial direction of the first tube. The arc surface or sloped surface design causes the opening of the second tube to have a radial expansion tendency when the first tube is inserted into the end of the sealing rib that contacts the connecting end. As the first tube is further inserted, the arc surface or sloped surface gradually engages with the connecting end, and the retraction force generated by the expansion of the connecting end better clamps the first tube to achieve and enhance the sealing effect.

[0008] Optionally, as the first end is inserted into the connecting end, the connecting end undergoes radial outward deformation under the resistance of the sealing rib. Thus, after the first and second pipes are connected, during daily use of the refrigeration appliance, the connecting end of the second pipe remains tightly bound to the sealing rib, ensuring reliable sealing.

[0009] Optionally, the end wall of the connecting end and the inner surface of the second tube have a chamfer or beveled connection. This allows the first end of the first tube to be inserted into the second tube more smoothly, further reducing assembly effort.

[0010] Optionally, the outer surface of the section of the first tube that extends into the second tube has a non-zero gap or a partial contact with the inner surface of the second tube. This makes the insertion of the first tube into the second tube smoother, and the sealing structure formed at the connection reliably prevents external liquids (e.g., thermal insulation material) from entering the internal space from the connection between the first and second tubes.

[0011] Optionally, the second end or the end of the second tube furthest from the connecting end is connected to the outer shell or inner shell. Thus, the first tube or the second tube can function as a connector to connect other components within the refrigeration appliance.

[0012] Optionally, the refrigeration appliance further includes: a fixing part, protruding outward from the outer circumferential surface of the first tube and located between the first end and the sealing rib; and a limiting hole, disposed at the connecting end and having an opening communicating with the limiting hole on the end wall of the connecting end, wherein the fixing part can enter through the opening and be confined within the limiting hole to restrict the relative movement of the first tube and the second tube. Thus, through the cooperation of the fixing part and the limiting hole, the first tube and the second tube are locked in a position where the sealing rib and the connecting end are tightly fitted, preventing the first tube and / or the second tube from rotating or moving during assembly and compromising the sealing effect.

[0013] Optionally, the limiting hole includes a first hole and a second hole that are connected. The first hole is located between the second hole and the opening and communicates with the opening. A stop step that tapers towards the center of the limiting hole is formed at the connection between the first hole and the second hole. During assembly, as the first tube is inserted into the second tube, the fixing part passes through the opening, the first hole, and then into the second hole, at which point the first tube is fully inserted. Due to the restriction of the stop step, the fixing part cannot easily retract into the first hole, thus preventing the first tube from dislodging from the second tube. This also keeps the sealing rib and the end of the connecting end in a tight fit, ensuring a superior sealing effect.

[0014] Optionally, the wall of the connecting end forming the first hole extends from the opening toward the second hole and towards each other. Thus, the first hole is funnel-shaped, widening towards the opening, which facilitates guiding the fixing part into the second hole.

[0015] Optionally, the inner diameter of the opening is greater than or equal to the maximum width of the fixing part. This allows the fixing part to smoothly enter the first hole through the opening.

[0016] Optionally, the inner diameter of the stop step is smaller than the maximum width of the fixing part. Therefore, after the fixing part enters the second hole, it is restricted from retracting into the first hole, preventing the first tube from unexpectedly dislodging from the second tube and ensuring the reliability of the connection and sealing between the first and second tubes.

[0017] Optionally, the inner diameter of the second hole is greater than or equal to the maximum width of the fixing part, so as to reliably accommodate the fixing part.

[0018] Optionally, the angle between the surface of the stop step facing the second hole and the axial direction of the second tube is taken from [90°, 45°] to ensure a better locking effect. Furthermore, the larger the angle, the better the locking effect on the fixing part.

[0019] Optionally, the angle between the surface of the stop step facing the second hole and the axial direction of the second tube is greater than the angle between the wall of the connecting end forming the first hole and the axial direction of the second tube. Therefore, after assembly, the disassembly force of the first tube is greater than the assembly force when inserting the first tube into the second tube, further ensuring the stability of the connection between the first and second tubes.

[0020] Optionally, the fixing part has an arc or beveled outer surface on at least one side facing the sealing rib. This prevents the fixing part and the limiting hole from completely locking after the first tube is inserted into the second tube, making it easier to remove the first tube for maintenance.

[0021] Optionally, the fixing part is shaped like a cam column, with the tip of the cam facing the first end. Therefore, the disassembly force of the first tube after assembly is greater than the assembly force when inserting the first tube into the second tube, which helps reduce assembly difficulty while also ensuring locking reliability and accommodating potential disassembly requirements of the first tube.

[0022] Optionally, the number of fixing parts is multiple and they are spaced apart circumferentially along the first tube, and the number of limiting holes is multiple, with each limiting hole corresponding to one of the multiple fixing parts. This allows for a better limiting and locking effect.

[0023] Optionally, at least one of the fixing parts and its corresponding limiting hole may have a shape and / or size different from the remaining fixing parts and their corresponding limiting holes. This serves to prevent mistaken identification.

[0024] Optionally, the number of the plurality of fixing parts is two, and the two fixing parts are symmetrically arranged along the radial direction of the first tube. Thus, a limiting and locking function is provided on both sides radially.

[0025] Optionally, the distance from the fixing part to the sealing rib is less than or equal to the distance from the limiting hole to the end wall of the connecting end. This ensures that after assembly, the first tube is locked in place with the sealing rib tightly gripping the end wall, improving the reliability of the sealing structure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a refrigeration appliance according to an embodiment of the present disclosure;

[0027] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0028] Figure 3 This is an assembly diagram of the first tube and the second tube according to the first embodiment of this disclosure;

[0029] Figure 4 yes Figure 3 A cross-sectional view along the BB direction;

[0030] Figure 5 yes Figure 4 A magnified view of a portion of region C in the middle;

[0031] Figure 6 yes Figure 3 A schematic diagram of the structure shown from another perspective;

[0032] Figure 7 yes Figure 6 A magnified view of a portion of region D in the middle;

[0033] Figure 8This is a schematic diagram of the assembly of the first tube and the second tube according to a second embodiment of this disclosure;

[0034] Figure 9 yes Figure 8 Cross-sectional view along the EE direction;

[0035] Figure 10 yes Figure 9 A magnified view of a portion of region F in the middle;

[0036] Figure 11 yes Figure 8 A schematic diagram of the structure shown from another perspective;

[0037] Figure 12 yes Figure 11 A magnified view of a portion of region G in the middle;

[0038] Figure 13 yes Figure 8 Exploded view of the structure shown;

[0039] Figure 14 yes Figure 13 A cross-sectional view along the HH direction;

[0040] Figure 15 yes Figure 12 A schematic diagram of the second tube in the middle;

[0041] In the attached image:

[0042] 1-Refrigeration appliance; 10-Inner shell; 11-Outer shell; 12-Insulation layer; 13-Water pipe; 14-Protective pipe; 2-First pipe; 2a-First end; 2b-Second end; 21-Sealing rib; 22-Outer surface of the first pipe; 23-Fixing part; 3-Second pipe; 3a-Connecting end; 3b-End of the second pipe away from the connecting end; 31-End wall of the connecting end; 32-Inner surface of the second pipe; 33-Limiting hole; 331-Opening; 332-First hole; 333-Second hole; 334-Stop step; 34-Open opening; d1-Inner diameter at the opening; d2-Inner diameter at the stop step; d3-Inner diameter of the second hole; L1-Maximum width of the fixing part; β-Angle between the surface of the stop step facing the second hole and the axial direction of the second pipe; α-Angle between the wall of the connecting end forming the first hole and the axial direction of the second pipe; r-Axial direction. Detailed Implementation

[0043] As mentioned in the background section, the sealing measures at the connection points of the protective tubes in existing refrigeration appliances are not environmentally friendly and have complicated assembly operations.

[0044] Another commonly used sealing method involves making the diameter of two adjacent sheath sections (denoted as sheath A and sheath B) slightly larger than that of sheath B. This allows sheath A to be inserted into sheath B with an interference fit, achieving a seal through the tight fit between their overlapping inner and outer circumferences. While this design saves on the use of adhesive tape, it requires considerable effort from workers during assembly. Furthermore, sheath A may fail to be properly installed due to excessive insertion resistance, thus affecting the sealing effect.

[0045] To address the aforementioned technical problems, this disclosure provides a refrigeration appliance, comprising: an inner shell for defining a storage space, an outer shell enclosing the inner shell, a heat insulation layer located between the inner shell and the outer shell, a first pipe and a second pipe at least partially located in the heat insulation layer, and a water pipe passing through the first pipe and the second pipe. The first pipe has a first end and a second end opposite to each other, and the second pipe has a connecting end. The first end is sealed to the connecting end. The outer circumferential surface of the first pipe is provided with an outwardly protruding sealing rib, which is closer to the first end than the second end, and is used to tightly engage with the end of the connecting end after the first end is inserted to form a sealing structure.

[0046] As described above, this embodiment features a sealing rib on the first tube. After the first end of the first tube is inserted into the connecting end of the second tube, a sealing structure is formed at the connection between the first and second tubes through the tight fit between the sealing rib and the connecting end. Therefore, sealing is achieved without the need for additional sealing components such as sponge tape, making it environmentally friendly. Furthermore, the first tube is not subject to excessive resistance during insertion into the second tube, allowing for smoother and less wear-prone insertion, making the assembly of the first and second tubes more labor-saving and efficient. Moreover, after the first tube is inserted, the tight fit between the sealing rib and the connecting end completes the seal, improving sealing reliability.

[0047] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0048] Figure 1 This is a schematic diagram of a refrigeration appliance 1 according to an embodiment of the present disclosure.

[0049] Refrigeration appliance 1 can be, for example, a refrigerator, a freezer, a wine cabinet, etc.

[0050] Specifically, refer to Figure 1 The refrigeration appliance 1 may include a cabinet and a door. The cabinet includes an inner shell 10 that defines a storage space and an outer shell 11 that encloses the inner shell 10. The storage space may be further divided into at least one chamber by the inner shell 10. Figure 1Part of the outer shell 11 is omitted to more clearly show the internal structure of the box.

[0051] The door is movably connected to the front of the cabinet to open or close at least a portion of the compartment. Taking a refrigerator as an example, the compartments can be, for instance, a freezer compartment, a refrigerator compartment, a variable temperature compartment, etc. Figure 1 An example is shown with two chambers arranged vertically, with the upper one being the refrigerator chamber and the lower one being the freezer chamber.

[0052] Furthermore, a heat insulation layer 12 is provided between the inner shell 10 and the outer shell 11, and the door may also include a heat insulation space filled with heat insulation material. When the door closes the chamber, the heat insulation layer 12 formed by the heat insulation space has the effect of insulating heat to ensure that the chamber has a better refrigeration / freezing effect.

[0053] refer to Figures 1 to 4 The refrigeration appliance 1 also includes a first pipe 2 and a second pipe 3, at least partially located in the insulation layer 12, and a water pipe 13 passing through the first pipe 2 and the second pipe 3. Specifically, the outer shell 11 has at least one opening 34, and at least one protective pipe 14 is laid inside the insulation layer 12. The two ends of each protective pipe 14 are respectively connected to the corresponding opening 34 and the corresponding inner shell 10. At least one water pipe 13 extends from at least one opening 34 into the corresponding protective pipe 14 and extends into the corresponding inner shell 10. Thus, the protective pipe 14 can play an insulating and protective role, preventing the water pipe 13 from being directly exposed to the insulation layer 12. For example, the outer shell 11 located at the top may have an opening 34, and a protective pipe 14 is provided inside the insulation layer 12 to connect the opening 34 to the upper refrigerator compartment, so as to guide external water into the refrigerator compartment. For example, the outer casing 11 located on the rear side may have an opening 34, and a protective tube 14 is provided in the insulation layer 12 to connect the opening 34 and the lower freezer compartment to guide external water into the freezer compartment, such as supplying water to the ice maker inside the freezer compartment.

[0054] Furthermore, the protective pipe 14 may include multiple pipe segments connected sequentially along the extending direction, wherein any two connected pipe segments may be the first pipe 2 and the second pipe 3, respectively. Figure 2 and Figure 3 For example, the second tube 3 can be connected to the open port 34, the first tube 2 can be connected to the second tube 3, and the end of the first tube 2 away from the second tube 3 is indirectly connected to the inner shell 10.

[0055] Further reference Figures 2 to 5 The first tube 2 has a first end 2a and a second end 2b opposite to each other, and the second tube 3 has a connecting end 3a, with the first end 2a and the connecting end 3a being sealed together. For example, the end 3b of the second tube 3 away from the connecting end 3a is connected to an open port 34, the connecting end 3a is sealed together with the first end 2a, and the second end 2b is directly or indirectly connected to the inner shell 10.

[0056] Further reference Figures 3 to 5 , Figures 8 to 10 The outer circumferential surface of the first tube 2 is provided with an outwardly protruding sealing rib 21, which is closer to the first end 2a than the second end 2b. The sealing rib 21 is used to tightly fit with the end of the connecting end 3a after the first end 2a is inserted to form a sealing structure.

[0057] During assembly, the first end 2a of the first pipe 2 is inserted into the second pipe 3 from the connecting end 3a until the end wall 31 of the connecting end 3a abuts against the sealing rib 21. At this time, the end of the connecting end 3a and the sealing rib 21 are tightly fitted to form a sealing structure around the outer circumference of the pipe at the initial contact area between the insertion point of the first pipe 2 and the second pipe 3 and the outside (e.g., the heat insulation layer 2).

[0058] Furthermore, a sealing structure is formed at the end of the connecting end 3a, and is formed in the final stage when the first tube 2 is inserted into the second tube 3 (i.e., when the end of the connecting end 3a is close to the sealing rib 21). The sealing structure formed around the end wall 31 of the connecting end 3a can block the gap between the first tube 2 and the second tube 3.

[0059] Therefore, a sealing rib 21 is provided on the first tube 2. After the first end 2a of the first tube 2 is inserted into the connecting end 3a of the second tube 3, a sealing structure is formed at the connection between the first tube 2 and the second tube 3 through the tight fit between the sealing rib 21 and the end of the connecting end 3a. Thus, sealing can be achieved without additional sealing components such as sponge tape, making it environmentally friendly. Furthermore, the first tube 2 is not subject to excessive resistance during the insertion of the second tube 3, allowing it to be inserted into place more smoothly and with less wear, making the assembly of the first tube 2 and the second tube 3 more labor-saving and efficient. Furthermore, after the first tube 2 is inserted into place, the tight fit between the sealing rib 21 and the end of the connecting end 3a completes the seal, improving the reliability of the seal.

[0060] In a specific implementation, refer to Figures 2 to 12 The sealing rib 21 has an arc-shaped surface on the side facing the first end 2a. For example, the sealing rib 21 can protrude outward in an arch shape from the outer surface of the first pipe 2 along the radial direction of the first pipe 2.

[0061] Alternatively, the sealing rib 21 facing the first end 2a can form a slope with a non-zero angle to the radial direction of the first pipe 2. For example, the sealing rib 21 facing the first end 2a can extend obliquely toward the axis of the first pipe 2 and toward the first end 2a to form a slope.

[0062] Therefore, the design of the arc or beveled surface makes the opening of the second tube 3 tend to expand radially when the first tube 2 is inserted into the end of the sealing rib 21 and contacts the end of the connecting end 3a. As the first tube 2 is further inserted, the arc or beveled surface gradually engages with the connecting end 3a. The retraction force generated by the expansion of the connecting end 3a better clamps the first tube 2 to achieve and enhance the sealing effect.

[0063] Furthermore, as the first end 2a is inserted into the connecting end 3a, the connecting end 3a undergoes radial outward deformation under the resistance of the sealing rib 21. Thus, after the first pipe 2 and the second pipe 3 are connected, during the daily use of the refrigeration appliance 1, the connecting end 3a of the second pipe 3 is always tightly bound to the sealing rib 21, ensuring reliable sealing.

[0064] In a specific implementation, refer to Figure 5 The end wall 31 of the connecting end 3a and the inner surface 32 of the second tube 3 may have a chamfer or a fillet. Alternatively, refer to... Figure 10 and Figure 13 The end wall 31 and the inner surface 32 can be connected by bevels. As the first tube 2 is inserted, the arc or bevel of the sealing rib 21 gradually engages with the connecting end 3a of the second tube 3, and guides the chamfer, rounded corner or bevel provided at the connecting end 3a to at least partially cross the arc or bevel of the sealing rib 21, so that the connecting end 3a of the second tube 3 has a more obvious radial expansion tendency, and then relies on the retraction force generated by the expansion of the connecting end 3a of the second tube 3 to clamp the first tube 2 to achieve a seal.

[0065] Furthermore, the bevel or chamfer on the inner surface 32 at the connecting end 3a can also serve as a guide. As a result, the first end 2a of the first tube 2 can be inserted into the second tube 3 more smoothly, further reducing the effort required for assembly.

[0066] In a specific implementation, refer to Figure 5 , Figure 10 and Figure 14 The outer surface 22 of the section of the first pipe 2 that extends into the second pipe 3 can have a non-zero gap or a partial contact with the inner surface 32 of the second pipe 3. That is, the seal between the first pipe 2 and the second pipe 3 is not achieved through surface-to-surface contact between the inner surface 32 and the outer surface 22, but rather through the cooperation between the end of the connection 3a and the sealing rib 21. This also prevents external liquid from entering between the inner surface 32 and the outer surface 22. Therefore, the insertion of the first pipe 2 into the second pipe 3 is smoother, and the sealing structure formed at the connection reliably prevents external liquid (e.g., thermal insulation material) from entering the internal space from the connection between the first pipe 2 and the second pipe 3.

[0067] In one variation, the gap between the outer surface 22 of the section of the first tube 2 that extends into the second tube 3 and the inner surface 32 of the second tube 3 can also be zero. That is, the outer surface of the first tube 2 near the first end 2a can be inserted into the connecting end 3a of the second tube 3 almost touching the inner surface 32 of the second tube 3.

[0068] In a variation, the outer diameter of the first end 2a of the first tube 2 can be slightly larger than the inner diameter of the connecting end 3a of the second tube 3, so that the first end 2a of the first tube 2 can be tightly inserted into the connecting end 3a of the second tube 3, which helps to further improve the sealing effect. In this example, the gap between the outer surface 22 of the section of the first tube 2 that extends into the second tube 3 and the inner surface 32 of the second tube 3 can be equivalent to being less than zero.

[0069] In one specific implementation, the end 2b of the second end 2b or the end 3b of the second tube 3 furthest from the connecting end 3a can be connected to the outer casing 11 or the inner casing 10. Figures 1 to 7 In the illustrated embodiment, the second end 2b of the first tube 2 is indirectly connected to the inner shell 10, and the end 3b of the second tube 3 is connected to the opening 34 in the outer shell 11. Thus, the first tube 2 or the second tube 3 can serve as a connector to connect other components within the refrigeration appliance 1. The connector is a protective tube 14 that provides the connection.

[0070] In another specific embodiment, reference is made to... Figures 8 to 15 The first tube 2 and the second tube 3 can both be ordinary protective tubes 14, that is, the second end 2b or the end 3b of the second tube 3 away from the connecting end 3a can be connected to other protective tubes 14 respectively.

[0071] In a specific implementation, refer to Figures 6 to 7 , Figures 11 to 12 The refrigeration appliance 1 may also include a fixing part 23, which protrudes outward from the outer peripheral surface of the first tube 2 and is located between the first end 2a and the sealing rib 21. For example, the fixing part 23 may be disposed close to the sealing rib 21, and there is a non-zero interval between the fixing part 23 and the sealing rib 21.

[0072] Further reference is needed. Figures 6 to 7 , Figures 11 to 12 The refrigeration appliance 1 may also include a limiting hole 33, which is provided at the connecting end 3a and has an opening 331 on the end wall 31 of the connecting end 3a that communicates with the limiting hole 33. During assembly, the first end 2a of the first tube 2 is inserted into the connecting end 3a. As the first tube 2 is inserted, the fixing part 23 can enter through the opening 331 and be confined within the limiting hole 33 to restrict the relative movement of the first tube 2 and the second tube 3. The sealing rib 21 and the end of the connecting end 3a are tightly fitted to form a sealing structure.

[0073] Thus, through the cooperation of the fixing part 23 and the limiting hole 33, the first tube 2 and the second tube 3 are locked in the position where the sealing rib 21 and the connecting end 3a are tightly fitted, and the first tube 2 and / or the second tube 3 are prevented from rotating or moving during the assembly process, thus avoiding damage to the sealing effect.

[0074] Further, refer to Figure 7 , Figures 12 to 15 The limiting hole 33 may include a first hole 332 and a second hole 333 that are connected. The first hole 332 is located between the second hole 333 and the opening 331 and is connected to the opening 331. A stop step 334 that narrows toward the center of the limiting hole 33 is formed at the connection between the first hole 332 and the second hole 333. During assembly, as the first tube 2 is inserted into the second tube 3, the fixing part 23 passes through the opening 331, the first hole 332, and then enters the second hole 333, at which point the first tube 2 is fully inserted. Under the restriction of the stop step 334, the fixing part 23 cannot easily retract into the first hole 332, thereby restricting the first tube 2 from being dislodged from the second tube 3, and also keeping the sealing rib 21 and the end of the connecting end 3a in a tight fit to ensure a better sealing effect.

[0075] In some embodiments, the wall of the connecting end 3a forming the first hole 332 can extend from the opening 331 toward the second hole 333 and towards each other. For example, the wall of the second tube 3 near the connecting end 3a for forming the first hole 332 can be a flat wall and extend obliquely from the opening 331 toward the second hole 333. Thus, the first hole 332 can be funnel-shaped, widening toward the opening 331, which facilitates guiding the fixing part 23 into the second hole 333.

[0076] Furthermore, the limiting hole 33 extends from the opening 331 away from the connecting end 3a and gradually narrows to form the first hole 332, and then suddenly expands to form the second hole 333. The abrupt change in the diameter of the first hole 332 and the second hole 333 forms a stop step 334.

[0077] The second hole 333 may include a connected rectangle and an arc. The rectangle connects to the first hole 332, and the arc may be, for example, a semicircle. Furthermore, the rectangle and the arc can be smoothly transitioned, that is, the wall of the second hole 333 is generally smooth without any abrupt protrusions.

[0078] In some embodiments, reference Figure 6 and 15 The inner diameter d1 at the opening 331 can be greater than or equal to the maximum width L1 of the fixing part 23. The maximum width L1 of the fixing part 23 is the maximum value of the dimension between a pair of sidewalls corresponding to the limiting hole 33. For example, if the fixing part 23 is a cylinder, then the maximum width L1 can be the diameter of the cylinder. Thus, the fixing part 23 can smoothly enter the first hole 332 through the opening 331.

[0079] In some embodiments, continue to refer to Figure 6 and Figure 15 The inner diameter d2 at the stop step 334 can be smaller than the maximum width L1 of the fixing part 23. As a result, after the fixing part 23 enters the second hole 333, it is restricted to retract back to the first hole 332, preventing the first tube 2 from unexpectedly coming out of the second tube 3, and ensuring the reliability of the connection and sealing between the first tube 2 and the second tube 3.

[0080] In some embodiments, continue to refer to Figure 6 and Figure 15 The inner diameter d3 of the second hole 333 can be greater than or equal to the maximum width L1 of the fixing part 23 to reliably accommodate the fixing part 23. The inner diameter d3 of the second hole 333 can be the size of the connection between the arc-shaped region and the rectangular region.

[0081] In some embodiments, continue to refer to Figure 15 The angle β between the face of the stop step 334 facing the second hole 333 and the axial direction r of the second tube 3 can be taken from [90°, 45°] to ensure a better locking effect. Considering that the second tube 3 and / or the first tube 2 can be flexible and arranged in a curved manner in the insulation layer 12, the axial direction r in this example preferably refers to the axial direction of the nested insertion section of the first tube 2 and the second tube 3.

[0082] Furthermore, the larger the included angle β, the better the effect of restricting the fixing part 23 located in the second hole 333 to return to the first hole 332, and the better the locking effect of the fixing part 23. Figure 6 , Figure 12 and Figure 15 The example shown is β=90°.

[0083] In some embodiments, continue to refer to Figure 15 The angle β between the surface of the stop step 334 facing the second hole 333 and the axial direction r of the second tube 3 can be greater than the angle α between the wall of the connecting end 3a forming the first hole 332 and the axial direction r of the second tube 3. Therefore, after assembly, the disassembly force of the first tube 2 is greater than the assembly force when inserting the first tube 2 into the second tube 3, further ensuring the stability of the connection between the first tube 2 and the second tube 3.

[0084] In one specific implementation, the fixing part 23 has an arc (or circular arc) or inclined surface on its outer surface at least on the side facing the sealing rib 21. For example, the fixing part 23 can be cylindrical in shape or at least arc-shaped on the side facing the sealing rib 21, so that after the fixing part 23 enters the second hole 333, the side of the fixing part 23 facing the connecting end 3a can make line contact with the stop step 334, rather than surface contact. This prevents the assembly of the first tube 2 and the second tube 3 from being too laborious, and also avoids the fixing part 23 and the limiting hole 33 from being completely locked after the first tube 2 is inserted into the second tube 3, making it convenient to remove the first tube 2 for maintenance.

[0085] Furthermore, when the first tube 2 is inserted into the second tube 3 and the end of the connecting end 3a is tightly fitted with the sealing rib 21 to form a sealing structure, most of the fixing part 23 is located in the second hole 333, and the remaining small part of the fixing part 23 can be located in the first hole 332. Since most of the fixing part 23 (especially at the maximum width L1) is confined in the second hole 333 by the stop step 334, a better locking effect can be ensured.

[0086] In one variation, the fixing part 23 can be shaped like a cam post, with the tip of the cam facing the first end 2a. During assembly, as the first tube 2 is inserted into the second tube 3, the tip of the cam can more easily enter the first hole 332 and the second hole 333 sequentially through the opening 331. After the first tube 2 is in place, the blunt end of the cam can more reliably engage with the stop step 334 to prevent the fixing part 23 from unexpectedly dislodging from the second hole 333. Thus, the disassembly force of the first tube 2 after assembly is greater than the assembly force when inserting the first tube 2 into the second tube 3, which helps to reduce the assembly difficulty while taking into account the locking reliability and the possible disassembly requirements of the first tube 2.

[0087] In some embodiments, the height h of the fixing part 23 protruding radially outward from the outer peripheral surface of the first tube 2 can satisfy the following formula: h ≥ 0.3 × t, where t is the wall thickness of the second tube 3. This helps to ensure the firmness after installation, for example, preventing the fixing part 23 from dislodging radially from the limiting hole 33.

[0088] Furthermore, after the first tube 2 is inserted into the second tube 3 and installed in place, the fixing part 23 can be flush with or slightly protrude from the outer surface of the second tube 3.

[0089] In a specific implementation, refer to Figures 13 to 15 The number of fixing parts 23 can be multiple and they are spaced apart along the circumference of the first tube 2. The number of limiting holes 33 can also be multiple, with each limiting hole 33 corresponding to one fixing part 23. This allows for better limiting and locking. For example, the multiple fixing parts 23 can be evenly distributed along the circumference of the first tube 2, and correspondingly, the multiple limiting holes 33 can be evenly opened along the circumference of the second tube 3.

[0090] Figures 13 to 15 Taking two fixing parts 23 and two limiting holes 33 as an example, the two limiting holes 33 and the two fixing parts 23 correspond one to one. As the first tube 2 is inserted into the second tube 3, each fixing part 23 enters the second hole 333 of the corresponding limiting hole 33 to achieve locking.

[0091] Furthermore, the two fixing parts 23 can be arranged symmetrically along the radial direction of the first pipe 2. Thus, a limiting and locking function is provided on both sides of the pipe in the radial direction.

[0092] In some embodiments, the shape and / or size of at least one of the plurality of fixing portions 23 and its corresponding limiting hole 33 may differ from the shape and / or size of the remaining fixing portions 23 and their corresponding limiting holes 33. For example, refer to Figures 13 to 15 The two fixing parts 23 can be cylinders with different diameters, and correspondingly, the dimensions (including d1, d2, and d3) of the two limiting holes 33 are also different. This serves to prevent mistaken assembly. For example, in some scenarios, the first pipe 2 or the second pipe 3 may be a bent pipe, and its bending tendency within the housing may be directionally restricted. This example uses paired fixing parts 23 and limiting holes 33 of different sizes to prevent the first pipe 2 or the second pipe 3 from being assembled in the wrong direction, ensuring that the bending tendency of the first pipe 2 or the second pipe 3 after assembly meets the requirements.

[0093] In some embodiments, the distance from the fixing part 23 to the sealing rib 21 can be less than or equal to the distance from the limiting hole 33 to the end wall 31 of the connecting end 3a. Specifically, the distance from the center of the fixing part 23 to the sealing rib 21 can be less than or equal to the distance from the center of the second hole 333 to the end wall 31 of the connecting end 3a. This ensures that after assembly, the first tube 2 is locked in the position where the sealing rib 21 tightly grips the end wall 31, improving the reliability of the sealing structure.

[0094] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this disclosure, even when only a single embodiment is described with respect to a particular feature. The examples of features provided in this disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with technical features of the independent claims, and technical features from the respective independent claims may be combined in any suitable manner rather than solely by the specific combinations listed in the claims.

[0095] While the above disclosure is provided, it is not limited thereto. Any person skilled in the art may make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure shall be determined by the scope defined in the claims.

Claims

1. A refrigeration appliance comprising: An inner shell (10) for defining a storage space, an outer shell (11) wrapping the inner shell (10), a thermal insulation layer (12) between the inner shell (10) and the outer shell (11), a first pipe (2) and a second pipe (3) at least partially in the thermal insulation layer (12), and a water pipe (13) passing through the first pipe (2) and the second pipe (3), characterized in that, the first pipe (2) has opposite first and second ends (2a, 2b), and the second pipe (3) has a connecting end (3a), the first end (2a) being sealingly connected to the connecting end (3a); wherein the first pipe (2) is provided with an outwardly protruding sealing protrusion (21) on the outer circumferential surface, the sealing protrusion (21) being closer to the first end (2a) than to the second end (2b) and being used to tightly fit with the end of the connecting end (3a) to form a sealing structure after the first end (2a) is inserted into the connecting end (3a).

2. The refrigeration appliance of claim 1, wherein, the side of the sealing protrusion (21) facing the first end (2a) is arc-shaped or has a non-zero included angle with the radial direction of the first pipe (2); and / or as the first end (2a) is inserted into the connecting end (3a), the connecting end (3a) is deformed radially outwardly under the abutment of the sealing protrusion (21); and / or the end wall (31) of the connecting end (3a) and the inner surface (32) of the second pipe (3) are connected by a chamfer or an inclined surface.

3. The refrigeration appliance of claim 1, wherein, the outer surface (22) of the section of the first pipe (2) extending into the second pipe (3) and the inner surface (32) of the second pipe (3) have a non-zero gap or virtual contact; and / or the second end (2b) or the end of the second pipe (3) away from the connecting end (3a) is connected to the outer shell (11) or the inner shell (10).

4. The refrigeration appliance of any of claims 1-3, wherein, Further comprising: a fixing portion (23) protruding outwardly from the outer circumferential surface of the first pipe (2) and located between the first end (2a) and the sealing protrusion (21); a limiting hole (33) provided in the connecting end (3a) and having an opening (331) in the end wall (31) of the connecting end (3a) to communicate with the limiting hole (33), the fixing portion (23) being able to enter the limiting hole (33) from the opening (331) to limit the relative movement of the first pipe (2) and the second pipe (3).

5. The refrigeration appliance of claim 4, wherein, the limiting hole (33) includes a first hole (332) and a second hole (333) in communication, the first hole (332) being located between the second hole (333) and the opening (331) and communicating with the opening (331), and a stop step (334) being formed at the connection of the first hole (332) and the second hole (333) and converging toward the center of the limiting hole (33).

6. The refrigeration appliance of claim 5, wherein, the wall of the connecting end (3a) forming the first hole (332) extends from the opening (331) toward the second hole (333); and / or ​ An inner diameter (d1) at the opening (331) is greater than or equal to a maximum width (L1) of the fixed portion (23); and / or An inner diameter (d2) at the stop step (334) is less than the maximum width (L1) of the fixed portion (23); and / or An inner diameter (d3) of the second hole (333) is greater than or equal to the maximum width (L1) of the fixed portion (23); and / or An included angle (β) between a face of the stop step (334) facing the second hole (333) and an axial direction of the second tube (3) is from [90°, 45°]; and / or The included angle (β) between the face of the stop step (334) facing the second hole (333) and the axial direction of the second tube (3) is greater than an included angle (α) between a wall of the connection end (3a) forming the first hole (332) and the axial direction of the second tube (3).

7. The refrigeration appliance of claim 4, wherein, An outer surface of the fixed portion (23) at least on a side facing the sealing protrusion (21) is arc-shaped or bevel-shaped; and / or, the fixed portion (23) is cam columnar, and a tip of the cam faces the first end (2a).

8. The refrigeration appliance of claim 4, wherein, The number of the fixed portions (23) is multiple and is arranged in a circumferential direction of the first tube (2), and the number of the limiting holes (33) is multiple, and the multiple limiting holes (33) and the multiple fixed portions (23) are one-to-one corresponding.

9. The refrigeration appliance of claim 8, wherein, Shapes and / or sizes of at least one fixed portion (23) and a corresponding limiting hole (33) in the multiple fixed portions (23) are different from shapes and / or sizes of remaining fixed portions (23) and corresponding limiting holes (33); and / or, the number of the multiple fixed portions (23) is two, and the two fixed portions (23) are arranged in a radial direction of the first tube (2) symmetrically.

10. The refrigeration appliance of claim 4, wherein, A distance from the fixed portion (23) to the sealing protrusion (21) is less than or equal to a distance from the limiting hole (33) to an end wall (31) of the connection end (3a).

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