Fin tube evaporator return air duct structure and air-cooled refrigerator

Abstract

The present invention discloses a fin tube evaporator return air duct structure and an air-cooled refrigerator. The present invention adopts a "refrigerated and variable temperature zone return air convex obliquely opposite" structure, that is, the refrigerated and variable temperature return air ports are relatively arranged at an inwardly inclined angle at the bottom of the evaporator, and the back plate of the evaporator in the return air port area is slightly convex outward. The return air ports are relatively arranged so that the refrigerated and variable temperature return air flows out relatively at the bottom of the evaporator. The return air ports are inclined at an angle and the back plate is convex outward so that the refrigerated and variable temperature return air will not be cut off by the frozen return air during the flow process, so that the refrigerated, variable temperature and frozen return air can be evenly mixed at the bottom of the evaporator, alleviating the non-uniform distribution of the frost layer on the surface of the evaporator.

Description

Technical Field

[0001] The present invention relates to the field of air-cooled refrigerators, and in particular to a fin tube evaporator return air duct structure and an air-cooled refrigerator. Technical Background

[0002] In a three-zone air-cooled refrigerator, the return air temperature / humidity of the refrigerated temperature zone and the variable temperature zone is generally much higher than that of the frozen temperature zone: the return air temperatures of the refrigerated, variable temperature, and frozen are generally around 5°C, -6°C, and -18°C, respectively, and the relative humidity is between 30 and 85%. Therefore, the return air humidity of the refrigerated and variable temperature zones will also be higher than that of the frozen return air. In the return air structure of a traditional air-cooled refrigerator, the frozen return air can completely cover the windward side of the evaporator from bottom to top, while the refrigerated and variable temperature return air can only partially cover the evaporator in the vertical direction, such as Figure 1 As shown; however, due to space limitations and structural interference, it is difficult to use devices such as static mixers to mix the return air evenly, so it is difficult to avoid uneven distribution of temperature and humidity in the evaporator flow, which in turn causes uneven distribution of frost on the evaporator surface. In severe cases, frost may even cause local blockage near the refrigeration and variable temperature return air outlets. The heat transfer performance of the evaporator is greatly reduced, and the refrigerator may even fail to cool.

[0003] For a two-temperature zone air-cooled refrigerator that only includes a refrigeration temperature zone and a freezing temperature zone, the situation is similar: the temperature / humidity of the refrigeration return air is greater than that of the freezing return air; the freezing return air completely covers the windward side of the evaporator from bottom to top, while the refrigeration return air can only partially cover the evaporator in the vertical direction, such as Figure 2 As shown, the evaporator inflow has non-uniform temperature and humidity, resulting in non-uniform distribution of frost on the evaporator surface. Summary of the invention

[0004] The present invention aims to solve the above-mentioned problem and provides a fin-tube evaporator return air duct structure and an air-cooled refrigerator. The duct structure improves the uniformity of the evaporator return air temperature and humidity distribution during the operation of the air-cooled refrigerator, thereby improving the uniformity of the frost layer distribution on its surface, optimizing the refrigeration performance of the air-cooled refrigerator, and reducing power consumption.

[0005] In order to achieve the above object, the present invention proposes the following technical solutions:

[0006] A fin tube evaporator return air duct structure comprises an evaporator shell and a refrigeration return air duct, a refrigeration return air port is arranged at the bottom of the front panel of the evaporator shell, and a refrigeration return air port is arranged at the back panel of the evaporator shell; the refrigeration return air duct is arranged at the back panel of the evaporator shell, and the end of the refrigeration return air duct is connected to the refrigeration return air port;

[0007] The rear back plate of the evaporator housing is convex to form a first wedge-shaped channel that allows the refrigerated return air to flow in a divergent shape and in a horizontal direction. The two ports of the first wedge-shaped channel are respectively connected to the refrigerated return air port and the refrigerated return air duct port.

[0008] The cross-section of the first wedge-shaped channel is trapezoidal, and the first wedge-shaped channel includes a first bottom port and a first top port, and the length of the first bottom port is greater than the length of the first top port; the first bottom port is connected to the refrigerated return air outlet, and the first top port is connected to the refrigerated return air duct.

[0009] The lengths of the freezing return air vent and the refrigeration return air vent are the same.

[0010] It also includes a variable temperature return air duct, and a variable temperature return air outlet is also provided on the back plate of the evaporator housing;

[0011] The rear back plate of the evaporator housing is convex to form a second wedge-shaped channel that allows the variable temperature return air to flow in a divergent shape and in a horizontal direction. The two ports of the second wedge-shaped channel are respectively connected to the variable temperature return air duct and the variable temperature return air port.

[0012] The cross-section of the second wedge-shaped channel is trapezoidal, and the second wedge-shaped channel includes a second bottom port and a second top port, and the length of the second bottom port is greater than the length of the second top port; the second bottom port is connected to the variable temperature return air outlet, and the second top port is connected to the variable temperature return air duct.

[0013] The variable temperature return air outlet and the refrigerated return air outlet are connected transversely, and the first inclined surface of the first wedge-shaped channel and the second inclined surface of the second wedge-shaped channel are connected.

[0014] The sum of the lengths of the variable temperature return air vent and the refrigerated return air vent is the same as the length of the frozen return air vent.

[0015] An air-cooled refrigerator comprises a fin-tube evaporator, wherein the fin-tube evaporator adopts the above-mentioned fin-tube evaporator return air duct structure.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The fin tube evaporator used in the air-cooled refrigerator of the present invention is designed for refrigerators with two temperature zones, refrigeration and freezing, and the return air duct structure is designed to use a wedge-shaped channel to connect the return air duct and the return air outlet, so that the refrigerated return air is convex and obliquely projected. That is, the refrigerated return air is obliquely arranged at an inwardly inclined angle on one side of the bottom of the evaporator, and at the same time, the back plate of the evaporator in the return air outlet area is slightly convex outward. The oblique arrangement of the refrigerated return air outlet allows the refrigerated return air to flow in the horizontal direction of the bottom of the evaporator, and the inclination angle of the return air outlet and the convex back plate prevent the refrigerated return air from being completely cut off by the frozen return air during the flow process, so that the two return air streams of refrigeration and freezing can be evenly mixed at the bottom of the evaporator, alleviating the uneven distribution of the frost layer on the surface of the evaporator.

[0018] The fin tube evaporator return air duct structure of the present invention is designed for refrigerators with three temperature zones: refrigeration, variable temperature, and freezing. The return air duct structure adopts a wedge-shaped channel to connect the return air duct and the return air outlet. The return air duct structure is characterized by a convex oblique structure for refrigeration and variable temperature return air. That is, the refrigeration and variable temperature return air outlets are relatively arranged at an inwardly inclined angle on both sides of the bottom of the evaporator, and at the same time, the back plate of the evaporator in the return air outlet area is slightly convex outward. The relative arrangement of the return air outlets allows the refrigeration and variable temperature return air to flow out relatively at the bottom of the evaporator, and the inclination angle of the return air outlet and the convex back plate prevent the refrigeration and variable temperature return air from being completely cut off by the freezing return air during the flow process, so that the refrigeration, variable temperature, and freezing return air can be evenly mixed at the bottom of the evaporator, alleviating the uneven distribution of the frost layer on the surface of the evaporator.

[0019] The air-cooled refrigerator of the present invention adopts the return air duct structure, which can alleviate the non-uniform distribution of frost layer on the evaporator surface. The air duct structure of the air-cooled refrigerator improves the uniformity of return air temperature and humidity distribution of the evaporator during the operation of the air-cooled refrigerator, thereby improving the uniformity of the frost layer distribution on its surface, optimizing the refrigeration performance of the air-cooled refrigerator, and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the structure diagram of the return air duct of the traditional three-temperature zone fin tube evaporator;

[0021] Figure 2 This is the structural diagram of the traditional two-temperature zone return air duct;

[0022] Figure 3 The structure diagram of the two-temperature zone return air duct designed for the present invention;

[0023] Figure 4 for Figure 3 Cross-sectional view of the return air duct structure in the middle and two temperature zones; (a) is the duct structure diagram, (b) is the schematic diagram of the return air principle;

[0024] Figure 5 The structure diagram of the return air duct of the three-temperature zone fin tube evaporator designed by the present invention;

[0025] Figure 6 for Figure 5 Cross-sectional view of the return air duct structure in the middle three temperature zones, (a) is the duct structure diagram, and (b) is the schematic diagram of the return air principle.

[0026] Among them, 1 is the evaporator shell, 2 is the variable temperature return air duct, 3 is the refrigerated return air duct, 4 is the variable temperature return air outlet, 5 is the refrigerated return air outlet, 6 is the frozen return air outlet, 7 is the first wedge-shaped channel, 8 is the second wedge-shaped channel, 9 is the first inclined surface, and 10 is the second inclined surface. DETAILED DESCRIPTION

[0027] The specific implementation examples of the present invention are described in detail below in conjunction with the accompanying drawings:

[0028] Example 1

[0029] like Figure 3 and Figure 4 As shown, a fin tube evaporator return air duct structure includes an evaporator shell 1 and a refrigerated return air duct 3, a refrigerated return air port 6 is arranged at the bottom of the front panel of the evaporator shell 1, and a refrigerated return air port 5 is arranged on the back panel of the evaporator shell 1; the refrigerated return air duct 3 is arranged on the back panel of the evaporator shell 1, and the end of the refrigerated return air duct 3 is connected to the refrigerated return air port 5.

[0030] For refrigerators with two temperature zones, the return air duct structure is characterized in that the return air for refrigeration is arranged at an inwardly inclined angle on one side of the bottom of the evaporator, and the back plate of the evaporator in the return air outlet area is slightly convex outward. The specific structure is that a first wedge-shaped channel 7 is arranged on the back plate on one side of the return air outlet 5, which enables the return air for refrigeration to flow in a divergent shape and in a horizontal direction, and the first wedge-shaped channel 7 is connected to both the return air outlet 5 and the return air duct 3 for refrigeration.

[0031] The cross section of the first wedge-shaped channel 7 is trapezoidal. The first wedge-shaped channel 7 includes a first bottom surface port and a first top surface port. The first bottom surface port is connected to the refrigerated return air port 5 , and the first top surface port is connected to the refrigerated return air duct 3 .

[0032] The principle is: the refrigerated return air outlet is set obliquely so that the refrigerated return air flows in the horizontal direction at the bottom of the evaporator, and the return air outlet inclination angle of the first wedge-shaped channel 7 and the convex structure of the back plate prevent the refrigerated return air from being completely cut off by the frozen return air during the flow process, so that the refrigerated and frozen return air can be evenly mixed at the bottom of the evaporator, alleviating the uneven distribution of frost on the surface of the evaporator.

[0033] As a preferred solution, the length of the first bottom surface port of the first wedge-shaped channel 7, the length of the refrigerated return air outlet 5, and the length (horizontal direction) of the frozen return air outlet 6 are equal.

[0034] Example 2

[0035] like Figure 5 and Figure 6 As shown, a fin tube evaporator return air duct structure includes an evaporator shell 1, a variable temperature return air duct 2 and a refrigerated return air duct 3. A refrigerated return air port 6 is arranged on the back plate of the evaporator shell 1, and a variable temperature return air port 4 and a refrigerated return air port 5 are arranged on the back plate of the evaporator shell 1; the variable temperature return air duct 2 and the refrigerated return air duct 3 are arranged on the back plate of the evaporator shell 1, and the variable temperature return air duct 2 is connected to the variable temperature return air port 4, and the end of the refrigerated return air duct 3 is connected to the refrigerated return air port 5.

[0036] For refrigerators with three temperature zones: refrigeration, variable temperature, and freezing, the return air duct structure is characterized by an outward convex oblique structure for the refrigeration and variable temperature return air. That is, the refrigeration and variable temperature return air ports are relatively arranged at an inwardly inclined angle on both sides of the bottom of the evaporator, and at the same time, the back plate of the evaporator in the return air port area is slightly convex outward. The specific structure is that a first wedge-shaped channel 7 is arranged on the back plate on one side of the refrigeration return air port 5, and the first wedge-shaped channel 7 is connected to both the refrigeration return air port 5 and the refrigeration return air duct 3. A second wedge-shaped channel 8 is arranged on the back plate on one side of the variable temperature return air port 4, which can make the variable temperature return air diverge and flow in the horizontal direction, and the second wedge-shaped channel 8 is connected to both the variable temperature return air duct 2 and the variable temperature return air port 4.

[0037] The cross section of the first wedge-shaped channel 7 is trapezoidal. The first wedge-shaped channel 7 includes a first bottom surface port and a first top surface port. The first bottom surface port is connected to the refrigerated return air port 5 , and the first top surface port is connected to the refrigerated return air duct 3 .

[0038] The cross section of the second wedge-shaped channel 8 is trapezoidal. The second wedge-shaped channel 8 includes a second bottom port and a second top port. The second bottom port is connected to the variable temperature return air port 4 , and the second top port is connected to the variable temperature return air duct 2 .

[0039] Preferably, the first inclined surface 9 of the first wedge-shaped channel 7 and the second inclined surface 10 of the second wedge-shaped channel 8 are connected.

[0040] The return air vents are arranged relative to each other so that the refrigerated and temperature-changing return air can flow out relatively at the bottom of the evaporator. The inclination angles of the return air vents of the first wedge-shaped channel 7 and the second wedge-shaped channel 8 and the outward protrusion of the back plate prevent the refrigerated and temperature-changing return air from being completely cut off by the frozen return air during the flow process. As a result, the refrigerated, temperature-changing and frozen return air can be evenly mixed at the bottom of the evaporator, alleviating the uneven distribution of frost on the surface of the evaporator.

[0041] As a preferred solution, the sum of the length of the first bottom surface port of the first wedge-shaped channel 7 and the length of the second bottom surface port of the second wedge-shaped channel 8 is equal to the length of the refrigeration return air outlet 6 .

[0042] The present invention adopts the structure of "the return air of the refrigerated and variable temperature zones is convex and obliquely opposite", that is, the return air outlets of the refrigerated and variable temperature zones are arranged at an inwardly inclined angle relative to each other at the bottom of the evaporator, and at the same time, the back plate of the evaporator in the return air outlet area is slightly convex, such as Figure 3 and Figure 4 The return air inlets are arranged relative to each other so that the refrigerated and variable temperature return air can flow out relative to each other at the bottom of the evaporator. The return air inlets are tilted at an angle and the back plate is convex so that the refrigerated and variable temperature return air will not be intercepted by the frozen return air during the flow process. Thus, the refrigerated, variable temperature and frozen return air can be evenly mixed at the bottom of the evaporator, alleviating the non-uniform distribution of the frost layer on the evaporator surface.

[0043] The present invention further provides an air-cooled refrigerator, comprising a fin-tube evaporator, wherein the fin-tube evaporator adopts the above-mentioned fin-tube evaporator return air duct structure.

[0044] Although the specific embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments, which are merely illustrative, instructive, and not restrictive. Under the guidance of this specification, a person skilled in the art can make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A fin tube evaporator return air duct structure, characterized in that: The evaporator comprises an evaporator shell (1) and a refrigeration return air duct (3); a refrigeration return air port (6) is arranged at the bottom of the front panel of the evaporator shell (1), and a refrigeration return air port (5) is arranged at the back panel of the evaporator shell (1); the refrigeration return air duct (3) is arranged on the back panel of the evaporator shell (1), and the end of the refrigeration return air duct (3) is connected to the refrigeration return air port (5); The back plate of the evaporator shell (1) is convex outward to form a first wedge-shaped channel (7) capable of causing the refrigerated return air to flow in a divergent shape and in a horizontal direction, and two ports of the first wedge-shaped channel (7) are respectively connected to the refrigerated return air port (5) and the port of the refrigerated return air duct (3); The cross section of the first wedge-shaped channel (7) is a trapezoid. The first wedge-shaped channel (7) comprises a first bottom surface port and a first top surface port. The length of the first bottom surface port is greater than the length of the first top surface port. The first bottom surface port is connected to the refrigerated return air port (5), and the first top surface port is connected to the refrigerated return air duct (3). It also includes a variable temperature return air duct (2), and a variable temperature return air port (4) is also provided on the back plate of the evaporator housing (1); The rear plate of the evaporator shell (1) is convex outward to form a second wedge-shaped channel (8) capable of causing the variable temperature return air to flow in a divergent shape and in a horizontal direction, and two ports of the second wedge-shaped channel (8) are respectively connected to the variable temperature return air duct (2) and the variable temperature return air port (4); The variable temperature return air outlet (4) and the refrigerated return air outlet (5) are connected transversely, and the first inclined surface (9) of the first wedge-shaped channel (7) and the second inclined surface (10) of the second wedge-shaped channel (8) are connected; The sum of the lengths of the variable temperature return air outlet (4) and the refrigerated return air outlet (5) is the same as the length of the frozen return air outlet (6).

2. An air-cooled refrigerator, characterized in that: It comprises a fin tube evaporator, and the fin tube evaporator adopts the fin tube evaporator return air duct structure according to claim 1.

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