Refrigerator heat exchange unit structure
By introducing horizontal and curved scraping mechanisms into the refrigerator, the frost on the surface of the fins and heat exchange coils is mechanically scraped off, solving the safety hazards and efficiency problems in the defrosting process of finned tube evaporators and achieving a more efficient heat exchange effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ICESHARE REFRIGERATING APPLIANCE CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-14
AI Technical Summary
Existing finned tube evaporators for refrigerators pose safety hazards and reduce heat exchange efficiency during defrosting. The effective heat exchange area between the fins and the air is reduced, and the liquid droplets cannot completely detach from the tube wall after defrosting.
A horizontal scraping mechanism and a bent tube scraping mechanism are used to mechanically scrape off the frost on the surface of the fins and heat exchange coils, avoiding defrosting by heating and ensuring that the frost is completely removed.
It improves heat exchange efficiency, reduces safety hazards, avoids the impact of heating and defrosting on the refrigerant, and ensures the cleanliness of the fins and heat exchange coil surfaces.
Smart Images
Figure CN224499194U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigerator heat exchanger technology, and in particular to a refrigerator heat exchanger unit structure. Background Technology
[0002] A refrigerator is a refrigeration device that maintains a constant low temperature, and it's also a consumer product used to keep food or other items at a constant low temperature. For frost-free refrigerators, finned-tube evaporators are commonly used. During the refrigeration process, due to the significant temperature difference between the surface of the finned-tube evaporator and the airflow being cooled, water molecules carried by the airflow will sublimate and frost onto the low-temperature surface of the finned-tube evaporator. In severe cases, the entire finned-tube evaporator can be covered with a layer of frost, reducing the effective heat exchange area between the fins and the air, and lowering heat exchange efficiency. To ensure the normal operation of the system, it is necessary to periodically stop the refrigerator's compressor to defrost the finned-tube evaporator.
[0003] Existing defrosting technology involves heating the entire evaporator to defrost, but this heating also affects the refrigerant inside the pipes, posing a significant safety hazard. Additionally, after defrosting, liquid drips freely from the surface of the pipes, and some droplets cannot detach from the pipe wall. Once the evaporator pipes cool down, these droplets will condense on the surface of the evaporator pipes, reducing heat exchange efficiency. Utility Model Content
[0004] In order to solve the problems mentioned in the background art, the present invention provides a refrigerator heat exchanger structure.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A refrigerator heat exchanger unit structure includes a heat exchange coil, fins, a horizontal scraping mechanism, and a bent-tube scraping mechanism. The fins are disposed on the outer circumferential surface of the heat exchange coil. The horizontal scraping mechanism and the bent-tube scraping mechanism are installed in the compartment where the heat exchange coil is installed. The horizontal scraping mechanism includes a fixed screw, a moving control head, a top frame beam, a hanging rod, and scraping blades. Hanging rods are provided on the front and rear sides of the heat exchange coil. Each scraping blade is installed on the hanging rod. The hanging rods are respectively installed on two different top frame beams. The two top frame beams are respectively controlled by two moving control heads. The two moving control heads are respectively threadedly installed with two fixed screws.
[0007] The bending scraping mechanism includes a telescopic frame, a connecting turntable, a self-hanging rod, and a surrounding ring. The telescopic frame is set on the left and right sides of the heat exchange coil. A motor is installed at the connection between the connecting turntable and the telescopic frame. A telescopic connecting rod is installed on the side of the connecting turntable facing the heat exchange coil. The self-hanging rod is installed on the telescopic connecting rod. The surrounding ring is connected to the self-hanging rod through a connecting rod.
[0008] Preferably, the scraper has a groove capable of accommodating the heat exchange coil. The scraper moves from the edge of the fin towards the heat exchange coil in a state of close contact with the fin surface until the scraper on both sides of the heat exchange coil aligns and surrounds the heat exchange coil.
[0009] Preferably, the two movable control heads are respectively threadedly installed with the two fixed screws. The movable control heads are restricted from axial rotation, while the fixed screws are fixed at a specified horizontal position and can be driven to rotate axially. The movable control heads are equipped with hydraulic devices that independently control the extension and retraction of the telescopic arm.
[0010] Preferably, the telescopic frame is fixed in a designated position by a hydraulic device and can be extended and retracted by the hydraulic device. There is one self-dwelling rod on each side of the heat exchange coil, and the two self-dwelling rods are respectively installed at the front and rear ends of the telescopic connecting rod.
[0011] Preferably, the telescopic connecting rod is fixedly installed near the edge of the connecting turntable, with the central axis of the connecting turntable directly above the central axis of the semicircle formed by the bent portion of the heat exchange coil on the same side. The distance from the center of the connecting turntable to the telescopic connecting rod is the same as the radius of the semicircle formed by the bent portion of the heat exchange coil. The telescopic connecting rod has an annular groove at the installation location of the self-plumbing rod, and a circular hole is opened at the upper end of the self-plumbing rod so that it can be precisely inserted into the annular groove.
[0012] Preferably, the surrounding ring and the connecting rod are connected by a rotating shaft limited by a coil spring, so that the surrounding ring can rotate axially around the connecting rod as the axis of rotation under the action of external force, and return to its original position under the action of the spring force after the external force is removed.
[0013] Preferably, when the self-hanging rods on both the front and rear sides of the heat exchange coil move toward the heat exchange coil, the surrounding rings can be joined together to surround the bent portion of the heat exchange coil.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] This utility model is equipped with a horizontal scraping mechanism and a curved tube scraping mechanism to mechanically scrape off the frost on the surface of the heat exchange coil and fins without heating the heat exchange coil. This makes the removal of frost from the surface of the heat exchange coil and fins more thorough and also avoids heating the refrigerant, reducing the safety hazards of existing heating defrosting methods. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structural design of a refrigerator heat exchanger unit according to the present invention;
[0018] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.
[0019] In the diagram: 1. Heat exchange coil; 2. Fins; 3. Horizontal scraping mechanism; 31. Fixed screw; 32. Moving control head; 33. Top frame beam; 34. Drooping rod; 35. Scraping blade; 36. Telescopic arm; 4. Bending tube scraping mechanism; 41. Telescopic frame rod; 42. Connecting turntable; 43. Self-hanging rod; 44. Enclosing ring; 45. Telescopic connecting rod; 46. Connecting rod. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] Example 1
[0022] Reference Figure 1 and 2 A refrigerator heat exchange unit structure includes a heat exchange coil 1, fins 2, a horizontal scraping mechanism 3, and a bent-tube scraping mechanism 4. The fins 2 are disposed on the outer circumferential surface of the heat exchange coil 1 to increase the heat exchange efficiency of the refrigerator. The horizontal scraping mechanism 3 and the bent-tube scraping mechanism 4 are installed in the compartment where the heat exchange coil 1 is installed to scrape off the frost on the surface of the heat exchange coil 1 and the fins 2.
[0023] The horizontal scraping mechanism 3 includes a fixed screw 31, a moving control head 32, a top frame beam 33, a hanging rod 34, and scraping blades 35. The heat exchange coil 1 is provided with hanging rods 34 on both the front and rear sides. Each scraping blade 35 is installed on the side of the hanging rod 34 facing the heat exchange coil 1 and corresponds to the position of each fin 2. The scraping blade 35 has a groove that can accommodate the heat exchange coil 1. When it is necessary to scrape off the frost on the surface of the fin 2, the hanging rod 34 moves toward the heat exchange coil 1 so that the scraping blade 35 moves from the edge of the fin 2 toward the heat exchange coil 1 in a state of close contact with the surface of the fin 2 until the scraping blades 35 on both sides of the heat exchange coil 1 meet and surround the heat exchange coil 1.
[0024] It is understood that when the edge of the scraper 35 moves toward the heat exchange coil 1, it can push the frost on the surface of the fin 2 toward the heat exchange coil 1 and remove it from the surface of the fin 2. As the scraper 35 continues to move, it gradually accumulates until it falls and is collected under the action of gravity. After the scraper 35 on the front and rear sides of the heat exchange coil 1 is connected and surrounds the heat exchange coil 1, it can move left and right with the hanging rod 34, thereby scraping off the frost on the surface of the heat exchange coil 1 to ensure the heat exchange efficiency of the heat exchange coil 1 and the fin 2.
[0025] The drooping rods 34, located on the front and rear sides of the heat exchange coil 1, are respectively installed on two different top frame beams 33. The two top frame beams 33 are each controlled by two moving control heads 32. The two moving control heads 32 are respectively threadedly installed with two fixing screws 31. The moving control heads 32 are restricted from axial rotation, while the fixing screws 31 are fixed at a specified horizontal position and can be driven to rotate axially. In this way, the moving control heads 32 are restricted to a specified height by the fixing screws 31. When the fixing screws 31 are driven to rotate axially, they can drive the moving control heads 32 to move horizontally left and right. The moving control heads 32 are connected to the top frame beams 33 through telescopic arms 36. The moving control heads 32 are equipped with hydraulic devices that independently control the extension and retraction of the telescopic arms 36, thereby controlling the front and rear horizontal movement of the top frame beams 33.
[0026] Example 2
[0027] Reference Figure 1 and 2 The difference between this embodiment and embodiment 1 is that the bending scraping mechanism 4 is respectively arranged on the left and right sides of the heat exchange coil 1 to scrape off the frost on the bent part of the heat exchange coil 1.
[0028] Specifically, the bending scraping mechanism 4 includes a telescopic frame rod 41, a connecting turntable 42, a self-hanging rod 43, and a surrounding ring 44. The connecting turntable 42 is installed at the end of the telescopic frame rod 41 facing the heat exchange coil 1. The telescopic frame rod 41 is fixed in a designated position by a hydraulic device and can be controlled by the hydraulic device to extend and retract, so that the connecting turntable 42 can move horizontally toward or away from the heat exchange coil 1. A telescopic connecting rod 45 is installed on the side of the connecting turntable 42 facing the heat exchange coil 1. One self-hanging rod 43 is provided on each of the front and rear sides of the heat exchange coil 1. The two self-hanging rods 43 are respectively installed at the front and rear ends of the telescopic connecting rod 45. The self-hanging rod 43 installed at the front end of the telescopic connecting rod 45 can move closer to or away from the self-hanging rod 43 installed at the rear end of the telescopic connecting rod 45 as the telescopic connecting rod 45 extends and retracts.
[0029] The telescopic connecting rod 45 is fixedly installed near the edge of the connecting turntable 42. The central axis of the connecting turntable 42 is directly above the central axis of the semicircle formed by the bent portion of the heat exchange coil 1 on the same side. The distance from the center of the connecting turntable 42 to the telescopic connecting rod 45 is the same as the radius of the semicircle formed by the bent portion of the heat exchange coil 1. A motor is provided at the connection between the connecting turntable 42 and the telescopic frame rod 41 to drive the connecting turntable 42 to rotate axially relative to the telescopic frame rod 41. The telescopic connecting rod 45 has an annular groove at the mounting point of the self-hanging rod 43. The upper end of the self-hanging rod 43 has a circular hole that can fit into the annular groove. In this way, when the connecting turntable 42 rotates axially, the self-hanging rod 43 can change its position along the annular trajectory of the rotation of the connecting turntable 42, but it can always hang vertically.
[0030] A connecting rod 46 is fixedly installed on the side of the self-dwelling rod 43 facing the heat exchange coil 1. The surrounding ring 44 is connected to the connecting rod 46 through a rotating shaft limited by a coil spring, so that the surrounding ring 44 can rotate axially around the connecting rod 46 as the rotation axis under the action of external force, and return to its original position under the action of the coil spring after the external force is removed. When the self-dwelling rods 43 on the front and rear sides of the heat exchange coil 1 move towards the heat exchange coil 1, the surrounding ring 44 can be spliced together to surround the bent part of the heat exchange coil 1. At this time, the rotation of the connecting turntable 42 can drive the surrounding ring 44 to move along the bent part of the heat exchange coil 1, thereby scraping off the frost on the bent part of the heat exchange coil 1.
[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.
[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A refrigerator heat exchanger unit structure, comprising a heat exchange coil (1), fins (2), a horizontal scraping mechanism (3), and a bent-tube scraping mechanism (4), wherein the fins (2) are disposed on the outer circumferential surface of the heat exchange coil (1), characterized in that: The horizontal scraping mechanism (3) and the bent tube scraping mechanism (4) are installed in the compartment where the heat exchange coil (1) is installed. The horizontal scraping mechanism (3) includes a fixed screw (31), a moving control head (32), a top frame beam (33), a hanging rod (34), and scraping blades (35). The front and rear sides of the heat exchange coil (1) are provided with hanging rods (34). Each scraping blade (35) is installed on the hanging rod (34). The hanging rods (34) are respectively installed on two different top frame beams (33). The two top frame beams (33) are respectively controlled by two moving control heads (32). The two moving control heads (32) are respectively threadedly installed with two fixed screws (31). The bending scraping mechanism (4) includes a telescopic frame (41), a connecting turntable (42), a self-hanging rod (43), and a surrounding ring (44). The telescopic frame (41) is respectively set on the left and right sides of the heat exchange coil (1). A motor is set at the connection between the connecting turntable (42) and the telescopic frame (41). A telescopic connecting rod (45) is installed on the side of the connecting turntable (42) facing the heat exchange coil (1). The self-hanging rod (43) is installed on the telescopic connecting rod (45). The surrounding ring (44) is connected to the self-hanging rod (43) through a connecting rod (46).
2. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: The scraper (35) has a groove that can accommodate the heat exchange coil (1). The scraper (35) moves from the edge of the fin (2) to the heat exchange coil (1) in a state of close contact with the surface of the fin (2) until the scraper (35) on both sides of the heat exchange coil (1) meet and surround the heat exchange coil (1).
3. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: The two movable control heads (32) are respectively threadedly installed with two fixed screws (31). The movable control heads (32) are restricted from axial rotation. The fixed screws (31) are fixed at a specified horizontal position and can be driven to rotate axially. The movable control heads (32) are equipped with hydraulic devices that independently control the extension and retraction of the telescopic arm (36).
4. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: The telescopic frame (41) is fixed in a designated position by a hydraulic device and can be telescopically controlled by the hydraulic device. There is one self-hanging rod (43) on each side of the heat exchange coil (1), and the two self-hanging rods (43) are respectively installed at the front and rear ends of the telescopic connecting rod (45).
5. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: The telescopic connecting rod (45) is fixedly installed near the edge of the connecting turntable (42). The central axis of the connecting turntable (42) is directly above the central axis of the semicircle formed by the bent part of the heat exchange coil (1) on the same side. The distance from the center of the connecting turntable (42) to the telescopic connecting rod (45) is the same as the radius of the semicircle formed by the bent part of the heat exchange coil (1). The telescopic connecting rod (45) has an annular groove at the installation location of the self-hanging rod (43). The upper end of the self-hanging rod (43) has a circular hole that can fit into the annular groove.
6. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: The surrounding ring (44) and the connecting rod (46) are connected by a rotating shaft limited by a coil spring, so that the surrounding ring (44) can rotate axially with the connecting rod (46) as the rotation axis under the action of external force, and return to its original position under the action of the spring force after the external force is removed.
7. The refrigerator heat exchanger unit structure according to claim 1, characterized in that: When the self-propelled rods (43) located on the front and rear sides of the heat exchange coil (1) move toward the heat exchange coil (1), the surrounding rings (44) can be joined together to surround the bent part of the heat exchange coil (1).