Evaporator and Refrigeration System

Abstract

The present invention relates to the field of refrigeration technology, and provides an evaporator, which includes a fan and a coil. The coil is a planar coil or composed of multiple planar coils. The planar coil is formed by arranging strip-shaped tubes in a circular arrangement on the same plane, and an inlet and an outlet are respectively provided at both ends of the strip-shaped tube; the fan is arranged at the inner circle of the strip-shaped tubes arranged in a circular arrangement. In the present invention, the outer shape of the coil is designed to be annular, and the fan is embedded inside the evaporator, significantly reducing the size of the evaporator, and it can be better installed in a circular shape and small space; the fan is arranged inside the evaporator, and the wind energy of the fan dissipates heat in a 360-degree circular direction, improving the convection speed and heat exchange efficiency.

Description

Technical Field

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

[0002] The refrigeration principle of a general refrigerating machine: The function of the compressor is to compress the steam with a lower pressure into the steam with a higher pressure, reducing the volume of the steam and increasing the pressure. The compressor sucks in the working medium steam with a lower pressure coming out of the evaporator, raises its pressure and then sends it into the condenser. In the condenser, it condenses into a liquid with a higher pressure. After throttling through the throttle valve, it becomes a liquid with a lower pressure and then is sent into the evaporator. In the evaporator, it absorbs heat and evaporates into steam with a lower pressure, and then is sent into the inlet of the compressor, thus completing the refrigeration cycle.

[0003] A system that uses external energy to transfer heat from a substance (or environment) with a lower temperature to a substance (or environment) with a higher temperature is called a refrigeration system. The refrigeration system mainly consists of a refrigerant and four major components, namely a compressor, a condenser, an expansion valve, and an evaporator.

[0004] The compressor is the power of the refrigeration cycle. It is driven by an electric motor and rotates continuously. Besides promptly extracting the steam in the evaporator to maintain a low temperature and low pressure, it also increases the pressure and temperature of the refrigerant steam through compression, creating conditions for transferring the heat of the refrigerant steam to the external environmental medium. That is, it compresses the low-temperature and low-pressure refrigerant steam to a high-temperature and high-pressure state so that normal-temperature air or water can be used as a cooling medium to condense the refrigerant steam.

[0005] The condenser is a heat exchange device. Its function is to use the environmental cooling medium (air or water) to take away the heat of the high-temperature and high-pressure refrigerant steam coming from the compressor, so that the high-temperature and high-pressure refrigerant steam is cooled and condensed into a high-pressure and normal-temperature refrigerant liquid. It is worth mentioning that during the process of changing the refrigerant steam into a refrigerant liquid in the condenser, the pressure remains unchanged and is still high pressure.

[0006] The evaporator is also a heat exchange device. The throttled low-temperature and low-pressure refrigerant liquid evaporates (boils) into steam in it, absorbing the heat of the substance to be cooled and lowering the temperature of the substance to achieve the purpose of freezing and refrigerating food. In an air conditioner, it cools the surrounding air to achieve the effects of cooling and dehumidifying the air. The lower the evaporation temperature of the refrigerant in the evaporator, the lower the temperature of the substance to be cooled. In a refrigerator, the evaporation temperature of the general refrigerant is adjusted to -26°C to -20°C, and in an air conditioner, it is adjusted to 5°C to 8°C.

[0007] A single-stage vapor compression refrigeration system consists of four basic components: a refrigeration compressor, a condenser, a throttle valve, and an evaporator. They are connected in sequence by pipelines to form a closed system. The refrigerant continuously circulates and flows in the system, undergoes state changes, and exchanges heat with the outside world.

[0008] After the liquid refrigerant absorbs the heat of the object to be cooled in the evaporator, it vaporizes into low-temperature and low-pressure steam, is sucked into the compressor, compressed into high-pressure and high-temperature steam, then discharged into the condenser, releases heat to the cooling medium (water or air) in the condenser, condenses into high-pressure liquid, is throttled by the throttle valve into low-pressure and low-temperature refrigerant, and then enters the evaporator again to absorb heat and vaporize, achieving the purpose of cycle refrigeration. In this way, the refrigerant completes a refrigeration cycle through four basic processes of compression, condensation, throttling, and evaporation in the system.

[0009] "Research on Defrosting Control Technology of BCD-350W Air-cooled Refrigerator" introduces a refrigerator evaporator, as Figure 1 and Figure 2 shown, the number of rows of the oncoming tube of this evaporator is 2, the number of tubes in a single row is 11, the arrangement of the tube bundle is an equilateral triangle staggered arrangement, and the liquid enters from inlet 1 and flows out from outlet 2.

[0010] The utility model patent with the authorization announcement number CN209459264U introduces an evaporator, which includes fins, U-shaped tubes and fixing devices. The fins are fixed on the U-shaped tubes, and the U-shaped tubes are arranged on the fixing devices for the refrigerant to pass through. The evaporator is provided with more than two evaporation zones. The number of U-shaped tubes arranged in each evaporation zone is inversely proportional to the wind speed passing through this evaporation zone. The U-shaped tubes in each evaporation zone are sequentially connected to form a pipeline, each having an inlet and an outlet, and the U-shaped tubes between different evaporation zones are not connected to each other.

[0011] The outer shapes of the evaporators in the prior art are all square and have large sizes. The evaporator and the fan are independent of each other, and it is difficult to meet the needs of installation occasions in small spaces.

[0012] The content in the background art part is only the technology known to the inventor and does not of course represent the prior art in this field. Summary of the Invention

[0013] Aiming at the problem that the evaporator in the prior art occupies a large space, the present invention provides an evaporator, which includes a fan and a coil. The coil is a flat coil or composed of multiple flat coils. The flat coil is formed by arranging strip tubes in a circular arrangement on the same plane. Inlets and outlets are respectively provided at both ends of the strip tube; the fan is arranged at the inner circle of the strip tubes arranged in a circular arrangement.

[0014] Furthermore, the number of strip tubes on each flat coil is one or more, and the flat coil is a mirror-symmetrical or axis-symmetrical structure. The number of strip tubes can be one, two or four. The pattern of the strip tube arrangement makes the flat coil a mirror-symmetrical or axis-symmetrical structure, as long as the evaporator dissipates heat evenly.

[0015] Furthermore, the pattern of each strip tube is a plurality of sector rings, and adjacent sector rings are connected end to end in a U-shaped structure. If the number of strip tubes on each of the planar coiled tubes is one, the pattern of each strip tube is a plurality of circular rings, and adjacent circular rings are connected end to end in a U-shaped structure. If the number of strip tubes on each of the planar coiled tubes is two, the pattern of each strip tube is a plurality of semi-circular rings, and adjacent semi-circular rings are connected end to end in a U-shaped structure. If the number of strip tubes on each of the planar coiled tubes is four, the pattern of each strip tube is a plurality of sector rings, the central angle of each sector ring is 90 degrees, and adjacent sector rings are connected end to end in a U-shaped structure.

[0016] Further, the strip tube is a copper tube.

[0017] Further, the fan is a centrifugal impeller or a propeller impeller.

[0018] Further, the evaporator further includes a plurality of radiation fins and one or more planar fins;

[0019] The planar fin is circular, and the size of the planar fin is adapted to the size of the planar coiled tube. If there are a plurality of planar fins, each planar fin is parallel to each other, and the centers of each planar fin are on the same straight line;

[0020] The radiation fin is rectangular, each radiation fin is perpendicularly connected to the planar fin, and extends along the radial direction of the planar fin or in a direction deviating from the radial direction of the planar fin by a certain angle. A plurality of radiation fins are arranged evenly to form a plurality of radially radiating air ducts. The size of the certain angle is greater than 0 degrees and less than or equal to 60 degrees, and can be 30 degrees, 45 degrees or 60 degrees, etc. If the radiation fin extends in a direction deviating from the radial direction of the planar fin by a certain angle, making the air duct form a shape similar to a fan, it is more conducive to heat dissipation.

[0021] Further, the number of planar fins is the same as the number of planar coiled tubes, the planar coiled tubes and the planar fins are in one-to-one correspondence, and each planar coiled tube is in the same plane as a planar fin and is embedded in the planar fin.

[0022] Further, the number of planar fins is two more than the number of planar coiled tubes. Two of the planar fins are arranged on both sides of the planar coiled tubes, and the remaining planar fins are in one-to-one correspondence with the planar coiled tubes. Each planar coiled tube is in the same plane as a planar fin and is embedded in the planar fin.

[0023] Further, the radiation fins include long radiation fins and short radiation fins, the long radiation fins and the short radiation fins are arranged at intervals, the length of the short radiation fin is shorter than that of the long radiation fin, and the distance between the short radiation fin and the center of the planar fin is longer than the distance between the long radiation fin and the center of the planar fin.

[0024] The present invention also provides a refrigeration system, including the evaporator, compressor, condenser and throttle valve described above.

[0025] The beneficial effects of the present invention are as follows:

[0026] The present invention designs the shape of the coil pipe as a ring and embeds the fan inside the evaporator, significantly reducing the size of the evaporator, which can be better installed in circular and small spaces; the fan is arranged inside the evaporator, and the wind energy of the fan dissipates heat in a 360-degree circular direction, improving the convection speed and heat exchange efficiency.

[0027] At the same time, the present invention also combines the flat fins and radiation fins to form a circular radiation-shaped convection channel, which can discharge or intake air from multiple directions; the long radiation fins and short radiation fins are arranged at intervals, increasing the distance between the fins and enhancing the convection wind speed, thereby improving the temperature uniformity inside the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0029] Figure 1 is the front view of the evaporator of the BCD-350W refrigerator in the prior art;

[0030] Figure 2 is the left view of the evaporator of the BCD-350W refrigerator in the prior art;

[0031] Figure 3 is the structural diagram of the evaporator of Embodiment 1;

[0032] Figure 4 is the perspective view of the flat coil pipe of Embodiment 1;

[0033] Figure 5 is the structural diagram of the evaporator of Embodiment 2;

[0034] Figure 6 is the perspective view of the flat coil pipe and fins of Embodiment 2;

[0035] Figure 7 is the perspective view (viewed from top to bottom) of the evaporator of Embodiment 3;

[0036] Figure 8 is the perspective view (viewed from bottom to top) of the evaporator of Embodiment 3;

[0037] Among them, 1 is the inlet; 2 is the outlet; 3 is the strip pipe; 4 is the fan; 51 is the radiation fin; 511 is the long radiation fin; 512 is the short radiation fin; 52 is the flat fin. Detailed Embodiments

[0038] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the accompanying drawings and the description are considered to be exemplary in nature rather than restrictive.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0041] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0042] Embodiment 1:

[0043] This embodiment shows an evaporator, as Figure 3 shown, including a fan 4 and a coil 3. The coil 3 is a planar coil, as Figure 4 shown. The planar coil is formed by arranging strip tubes in a circular ring pattern on the same plane; the strip tubes are copper tubes, and the number is two. The pattern of each strip tube is a plurality of semi-circular rings, and adjacent semi-circular rings are connected end to end in a U-shaped structure. Each end of the strip tube of each strip tube is respectively provided with an inlet 31 and an outlet 32; two strip tubes with the same shape are combined into a planar coil arranged in a circular ring pattern, making the planar coil have an axisymmetric structure; the fan 4 is arranged at the inner circle of the strip tubes arranged in a circular ring pattern, and the fan 4 is a propeller-type wind wheel.

[0044] In this embodiment, the outer shape of the coil 3 is designed to be annular, and the fan 4 is embedded at the inner circle of the coil 3, significantly reducing the size of the evaporator, and it can be better installed in a circular and small space; the fan 4 is arranged inside the evaporator, and a propeller-type wind wheel is used. The wind of the fan 4 enters the evaporator from the surrounding of the evaporator and exits from the inner circle of the coil 3, improving the convection speed and heat exchange efficiency.

[0045] Example 2:

[0046] This example demonstrates an evaporator, as Figure 5 and Figure 6 shown, including a coil 3, a fan 4, 16 radiation fins 51 and 2 flat fins 52. Among them, there are two flat coils in this example, and the pattern of the flat coils is the same as that of the flat coils in Example 1. The fan 4 is arranged at the inner circle of the strip tubes arranged in a circular shape of the coil 3, and the fan 4 is a centrifugal impeller.

[0047] The flat fin 52 is circular, with a size adapted to that of the flat coil. The two flat fins 52 are parallel to each other, and the centers of each flat fin 52 are on the same straight line. The flat coils correspond to the flat fins 52 one by one, and each flat coil is in the same plane as a flat fin 52 and is embedded in the flat fin.

[0048] The radiation fin 51 is rectangular. Each radiation fin 51 is perpendicularly connected to the flat fin 52 and extends along the radial direction of the flat fin 52 or a direction deviating from the radial direction by more than 0 degree and less than or equal to 60 degrees, which can be 30 degrees, 45 degrees or 60 degrees. The 16 radiation fins 52 are evenly arranged to form multiple circular radiation-shaped air ducts. The radiation fin 52 includes 8 long radiation fins 511 and 8 short radiation fins 512. The long radiation fins 511 and the short radiation fins 512 are arranged at intervals. The length of the short radiation fin 512 is shorter than that of the long radiation fin 511, and the distance between the short radiation fin 512 and the center of the flat fin 52 is longer than the distance between the long radiation fin 511 and the center of the flat fin 52.

[0049] On the basis of Example 1, this example not only increases the number of flat coils, but also adds the flat fins 52 and the radiation fins 51. The increase in the number of flat coils is beneficial to improving the heat exchange efficiency of the evaporator; the fan 4 uses a centrifugal impeller, and the air enters from the inner circle of the coil 3 and exits towards the periphery of the evaporator; the combination of the flat fins 52 and the radiation fins 51 forms a circular radiation-shaped convection channel, which can blow or intake air from multiple directions; the long radiation fins 511 and the short radiation fins 512 are arranged at intervals, increasing the fin spacing and enhancing the convection air velocity, thereby improving the temperature uniformity inside the evaporator.

[0050] Example 3:

[0051] This example demonstrates an evaporator, as Figure 7 and Figure 8As shown in the figure, it includes a coil pipe 3, a fan 4, 16 radiation fins 51 and 4 flat fins 52. The structure of the evaporator in this embodiment is basically the same as that of the evaporator in Embodiment 2. The difference is that the number of flat fins 52 in this embodiment is 2 more than that of the flat coil pipes, and the two additional flat fins 52 are arranged on both sides of the flat coil pipes.

[0052] Based on Embodiment 2, this embodiment adds two flat fins 52. The added flat fins 52 can lock the wind direction of the outermost flat coil pipes, which is beneficial to the uniformity of the overall heat dissipation of the flat coil pipes.

[0053] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An evaporator, characterized in that, The evaporator includes a fan and a coil. The coil is a flat coil or composed of multiple flat coils. The flat coil is formed by arranging strip tubes in a circular pattern on the same plane. Inlets and outlets are respectively provided at both ends of the strip tubes; the number of strip tubes on each flat coil is one or more, and the flat coil has a mirror symmetry or axisymmetric structure; the pattern of each strip tube is multiple sector rings, and adjacent sector rings are connected end to end in a U-shaped structure. The fan is arranged at the inner circle of the strip tubes arranged in a circular pattern. The evaporator further includes multiple radiation fins and one or more flat fins. The flat fin is circular, and the size of the flat fin is adapted to the size of the flat coil. If there are multiple flat fins, each flat fin is parallel to each other, and the centers of each flat fin are on the same straight line. The radiation fin is rectangular, each radiation fin is perpendicularly connected to the flat fin, and extends along the radial direction of the flat fin or a direction deviating from the radial direction of the flat fin by a certain angle. Multiple radiation fins are evenly arranged to form multiple radial air ducts. The number of flat fins is the same as the number of flat coils. The flat coils and the flat fins are in one-to-one correspondence. Each flat coil is on the same plane as a flat fin and is embedded in the flat fin; or The number of flat fins is two more than the number of flat coils. Two of the flat fins are arranged on both sides of the flat coils, and the remaining flat fins are in one-to-one correspondence with the flat coils. Each flat coil is on the same plane as a flat fin and is embedded in the flat fin.

2. The evaporator according to claim 1, characterized in that, The strip tube is a copper tube.

3. The evaporator according to claim 1, wherein, The fan is a centrifugal impeller or a propeller impeller.

4. The evaporator according to claim 1, wherein The radiation fin includes a long radiation fin and a short radiation fin. The long radiation fin and the short radiation fin are arranged at intervals. The length of the short radiation fin is shorter than that of the long radiation fin, and the distance between the short radiation fin and the center of the flat fin is longer than the distance between the long radiation fin and the center of the flat fin.

5. A refrigeration system, characterized in that, It includes the evaporator according to any one of claims 1-4, a compressor, a condenser, and a throttle valve.

Images