A kind of automatic defrosting thin-diameter fin-tube heat exchanger

Abstract

The present invention relates to the technical field of heat exchangers, and specifically discloses an automatic defrosting thin-diameter fin-tube heat exchanger, comprising an outer frame, in which a plurality of first heat exchange fins and second heat exchange fins are alternately arranged, the first heat exchange fins are provided with a plurality of expansion holes and through holes, the second heat exchange fins are provided with through holes aligned with each expansion hole on the first heat exchange fins and expansion holes aligned with each through hole, the expansion holes of the plurality of first heat exchange fins are commonly connected with a first heat exchange tube, the expansion holes of the plurality of second heat exchange fins are commonly connected with a second heat exchange tube, one end of the first heat exchange tube and the second heat exchange tube are connected with a feed three-way valve, and the other end is connected with a discharge three-way valve; the thin-diameter fin-tube heat exchanger realizes the removal of frost on the fins during continuous refrigeration, and also effectively reduces the power loss during the operation of the heat exchanger, and at the same time the entire heat exchanger has a simple preparation process and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular discloses an automatic defrosting thin-diameter fin-tube heat exchanger. Background Art

[0002] The narrow-diameter fin-tube heat exchanger is a common fin heat exchanger. In the industry, the heat exchange tube with a diameter less than 7mm is called a narrow-diameter fin-tube heat exchanger. Currently, the narrow-diameter fin-tube heat exchanger has been widely used in refrigeration equipment such as air conditioners and refrigerators.

[0003] Since the volume of the thin-diameter fin-tube heat exchanger is relatively small, the distance between two adjacent fins is generally no more than 2mm. Once the refrigerant temperature is too low and the external environment is humid, frost is easy to form on the surface of the fin. After the frost layer is formed, the air duct of the fin heat exchanger will become narrower and the ventilation volume will decrease. When the ventilation volume decreases, the heat exchange effect will be further reduced, which will further cause the wall temperature of the fin heat exchanger to drop. The continued cooling of the refrigerant will make the frost layer thicker.

[0004] Existing fin heat exchangers often use two sets of pipeline systems for defrosting, one of which is used to transport refrigerant and the other is used to transport high-temperature medium (such as steam). For example, the utility model patent with application number 2014208140994 discloses a frost-suppressing fin heat exchanger, including a heat exchange tube, which is respectively connected to a first refrigerant pipeline and a second refrigeration steam pipeline, and the refrigerant in the second refrigeration steam pipeline flows into the first refrigerant pipeline after throttling. When frost occurs, the fin heat exchanger disclosed in the utility model patent will use the high-temperature medium in the second refrigeration steam pipeline to melt and remove the frost on the surface of the fin, and has a relatively excellent defrosting effect. However, when the fin heat exchanger is used in refrigeration equipment such as air conditioners and refrigerators, the refrigeration effect needs to be maintained throughout the process. When the high-temperature medium is passed into the heat exchanger for defrosting, the temperature on the fins will gradually rise, and the refrigerant needs to be re-introduced during subsequent refrigeration, resulting in a large consumption of the entire refrigerant, which increases the power loss during the operation of the entire fin heat exchanger. Therefore, in view of the above-mentioned deficiencies of the existing anti-frost fin heat exchanger, the present application proposes a thin-diameter fin-tube heat exchanger that can achieve the defrosting function without the need to introduce a high-temperature medium. Summary of the invention

[0005] The present invention aims to provide a thin-diameter fin-tube heat exchanger that can achieve a defrosting function without passing a high-temperature medium, so as to solve the defect that the existing fin heat exchanger needs to pass a high-temperature medium for defrosting.

[0006] The present invention is achieved through the following technical solutions:

[0007] A thin-diameter fin-tube heat exchanger with automatic defrosting comprises an outer frame, in which a plurality of first heat exchange fins and second heat exchange fins are alternately arranged at intervals, a plurality of expansion holes and a plurality of through holes are provided on the first heat exchange fin, and the aperture of the expansion hole is smaller than the aperture of the through hole, the second heat exchange fin is provided with a through hole aligned with each expansion hole on the first heat exchange fin and an expansion hole aligned with each through hole, a plurality of the expansion holes of the first heat exchange fins are commonly connected to a first heat exchange tube, a plurality of the expansion holes of the second heat exchange fins are commonly connected to a second heat exchange tube, one end of the first heat exchange tube and the second heat exchange tube are connected to a feed three-way valve, and the other end of the first heat exchange tube and the second heat exchange tube are connected to a discharge three-way valve.

[0008] As a first specific design of the above scheme, the plurality of expansion holes and the plurality of through holes on the first heat exchange fins are arranged in a row respectively, and the first heat exchange tube passes through the expansion holes on the first heat exchange fins in an S-shape, and the plurality of expansion holes and the plurality of through holes on the second heat exchange fins are also arranged in a row respectively, and the second heat exchange tube passes through the expansion holes on the second heat exchange fins in an S-shape.

[0009] As a second specific design of the above scheme, the multiple expansion holes and the multiple through holes on the first heat exchange fins are respectively arranged in multiple rows, and the multiple first heat exchange tubes are passed through the corresponding expansion holes on the first heat exchange fins in an S-shape, and the multiple expansion holes and the multiple through holes on the second heat exchange fins are respectively arranged in multiple rows, and the multiple second heat exchange tubes are passed through the corresponding expansion holes on the second heat exchange fins in an S-shape.

[0010] As a specific setting of the above scheme, tube end connecting pipes are connected between the two ends of the plurality of first heat exchange tubes and the second heat exchange tubes, the feed three-way valve is arranged between the tube end connecting pipes at the same end of the first heat exchange tube and the second heat exchange tube, and the discharge three-way valve is arranged between the tube end connecting pipes at the other same end of the first heat exchange tube and the second heat exchange tube.

[0011] As a further configuration of the above solution, the lower ends of the first heat exchange fins and the second heat exchange fins are punched to form a plurality of elastic strips arranged at intervals, and the elastic strips are bent at a certain angle.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The narrow-diameter fin-tube heat exchanger disclosed in the present invention is designed to adopt two groups of heat exchange tubes for passing refrigerant medium, and the two groups of heat exchange tubes are respectively connected to the first heat exchange fins and the second heat exchange fins which are arranged alternately, and then the refrigerant delivery path is controlled by a three-way valve between the ends of the two groups of heat exchange tubes; during the operation of the heat exchanger, only one of the first heat exchange fins or the second heat exchange fins transfers heat with the refrigerant. When frost appears on the first heat exchange fins or the second heat exchange fins, the refrigerant delivery path can be directly controlled by the three-way valve so that the frosted heat exchange fins stop exchanging heat with the refrigerant, and the other group of heat exchange fins can be used as a replacement. In the subsequent operation, the frosted heat exchange fins can not only continue to contact with the air for heat exchange, thereby achieving air cooling, but also use the air to melt and remove the frost layer; the narrow-diameter fin-tube heat exchanger disclosed in the present invention can achieve continuous refrigeration, can remove frost during the refrigeration process, and also effectively reduce the power loss during the operation of the heat exchanger.

[0014] The overall structure of the automatic defrosting thin-tube fin-tube heat exchanger disclosed in the present invention is not much different from that of the existing heat exchanger. It only needs to punch expansion holes and perforations of different aperture sizes during the fin processing. The preparation process of the entire heat exchanger is simple and the manufacturing cost is low.

[0015] The present invention further improves the design of the fins. By punching and forming an elastic strip at the lower end of the fin, the elastic strip can be blown by the blowing wind during the defrosting process, causing the elastic strip to vibrate slightly, thereby accelerating the sliding of the frost attached to the heat exchange fins after melting, thereby improving the defrosting effect of the entire heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of Example 1 of the present invention;

[0018] Figure 2 It is a schematic diagram of a partial three-dimensional structure of Example 1 of the present invention;

[0019] Figure 3 Schematic diagram of the three-dimensional structure of the heat exchange fin in Example 1 of the present invention;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of Example 2 of the present invention;

[0021] Figure 5 It is a schematic diagram of a partial three-dimensional structure of Example 2 of the present invention;

[0022] Figure 6 Schematic diagram of the three-dimensional structure of the heat exchange fin in Example 2 of the present invention;

[0023] Figure 7 This is a schematic diagram of the three-dimensional structure of Example 3 of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the heat exchange fin in Example 3 of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments. Example 1

[0027] Example 1 discloses an automatic defrosting thin-diameter fin-tube heat exchanger, see the attached Figure 1 , Attachment Figure 2 and attached Figure 3 The main body of the heat exchanger includes an outer frame 1, a first heat exchange fin 2, a second heat exchange fin 3, a first heat exchange tube 4 and a second heat exchange tube 5, wherein the first heat exchange tube 4 and the second heat exchange tube 5 are both composed of a plurality of equally spaced U-shaped copper tubes and elbow joints, and the first heat exchange tube 4 and the second heat exchange tube 5 are connected in a circuitous S shape.

[0028] A row of expansion holes 201 is formed at the upper end of the first heat exchange fin 2, and a row of through holes 202 is formed at the lower end, and the aperture of the through holes 202 is larger than the aperture of the expansion holes 201. A row of through holes 202 is formed at the upper end of the second heat exchange fin 3, and a row of expansion holes 201 is formed at the lower end, and similarly, the aperture of the through holes 202 on the second heat exchange fin 3 is larger than the aperture of the expansion holes 201.

[0029] A plurality of first heat exchange fins 2 and a plurality of second heat exchange fins 3 are arranged alternately at equal intervals, and then the first heat exchange tube 4 is sequentially passed through the expansion holes 201 on the first heat exchange fin 2 and the through holes 202 on the second heat exchange fin 3, and then the tube body of the first heat exchange tube 4 is connected to the expansion holes 201 on the plurality of first heat exchange fins 2 by using the tube expansion technology, while the tube body of the first heat exchange tube 4 does not contact the through holes 202 on the second heat exchange fin 3. Similarly, the second heat exchange tube 5 is sequentially passed through the through holes 202 on the first heat exchange fin 2 and the expansion holes 201 on the second heat exchange fin 3, and the tube body of the second heat exchange tube 5 is connected to the expansion holes 201 on the second heat exchange fin 3 by using the tube expansion technology, while the tube body of the second heat exchange tube 5 does not contact the through holes 202 on the first heat exchange fin 2. Through the above design, the refrigerant in the first heat exchange tube 4 can exchange heat with the multiple first heat exchange fins 2 during the transportation process, and the refrigerant in the second heat exchange tube 5 can exchange heat with the second heat exchange fins 3 during the transportation process.

[0030] Finally, both ends of the first heat exchange tube 4 and the second heat exchange tube 5 are extended out of the outer frame 1, and a feed three-way valve 6 is arranged between the inlet ends of the first heat exchange tube 4 and the second heat exchange tube 5, and then a discharge three-way valve 7 is arranged between the discharge ends of the first heat exchange tube 4 and the second heat exchange tube 5.

[0031] During the operation of the automatic defrosting thin-diameter fin-tube heat exchanger disclosed in this embodiment 1, the refrigerant is first transported along the first heat exchange tube 4 by controlling the feed three-way valve 6 and the discharge three-way valve 7. When the first heat exchange fin 2 is frosted after a period of operation, the feed three-way valve 6 and the discharge three-way valve 7 are controlled to close both ends of the first heat exchange tube 4 and open both ends of the second heat exchange tube 5, so that the refrigerant can be transported along the second heat exchange tube 5. At this time, since there is no refrigerant transported in the first heat exchange tube 4, the frost on the first heat exchange fin 2 can be gradually melted and removed during the contact with the external wind body, without the need to introduce high-temperature medium for removal. Similarly, when frost appears on the second heat exchange fin 3, the above-mentioned defrosting function can be achieved by controlling the feed three-way valve 6 and the discharge three-way valve 7 to change the refrigerant transportation route, and the entire heat exchanger can continue to operate in a refrigeration state. Example 2

[0032] Example 2 discloses a thin-diameter fin-tube heat exchanger with an improved design based on the technical solution in Example 1. Figure 4 , Attachment Figure 5 and attached Figure 6 The main body of the heat exchanger includes an outer frame 1, a first heat exchange fin 2, a second heat exchange fin 3, a first heat exchange tube 4 and a second heat exchange tube 5.

[0033] Two rows of expansion holes 201 spaced apart from each other are provided on the first heat exchange fin 2, and a row of through holes 202 is provided between the two rows of expansion holes 201 and at the lower end of the first heat exchange fin 2, and the aperture of the through hole 202 is larger than the aperture of the expansion hole 201, wherein each expansion hole 201 is also staggered with the through hole 202. Similarly, two rows of through holes 202 spaced apart from each other are provided on the second heat exchange fin 3, and a row of expansion holes 201 is provided between the two rows of through holes 202 and at the lower end of the second heat exchange fin 3, and each through hole 202 on the second heat exchange fin 3 is aligned with the expansion hole 201 of the first heat exchange fin 2, and each expansion hole 201 on the first heat exchange fin 2 is aligned with the through hole 202 of the first heat exchange fin 2. Next, the two first heat exchange tubes 4 are connected to the expansion holes 201 on the first heat exchange fins 2 by using the tube expansion technology, and the two second heat exchange tubes 5 are connected to the expansion holes 201 on the second heat exchange fins 3 by using the tube expansion technology.

[0034] Finally, a three-way pipe 8 is connected between the inlet end and the outlet end of the two first heat exchange tubes 4. Similarly, a three-way pipe 8 is also connected between the inlet end and the outlet end of the two second heat exchange tubes 5, and a feed three-way valve 6 is provided between the three-way pipe at the inlet end of the first heat exchange tube 4 and the three-way pipe 8 at the inlet end of the second heat exchange tube 5, and a discharge three-way valve 7 is provided between the three-way pipe at the outlet end of the first heat exchange tube 4 and the three-way pipe 8 at the outlet end of the second heat exchange tube 5.

[0035] The first heat exchange tube 4 and the second heat exchange tube 5 in this embodiment 2 are both double-pipe designs, and the two first heat exchange tubes 4 are connected to the expansion holes 201 on the first heat exchange fins 2 as a whole, and the two second heat exchange fins 3 are connected to the expansion holes 201 on the second heat exchange fins 3 as a whole. The cooling and defrosting process of the entire heat exchanger is the same as that in embodiment 1, and can be achieved by controlling the connection status of the feed three-way valve 6 and the discharge three-way valve 7. Example 3

[0036] Example 3 discloses a thin-diameter fin-tube heat exchanger with an improved design based on the technical solution in Example 1. Figure 7 and attached Figure 8 The similarities between this embodiment 3 and embodiment 1 are not described again, and the difference is that:

[0037] In this embodiment 3, a plurality of elastic strips 9 arranged at intervals are integrally punched out at the lower ends of the first heat exchange fin 2 and the second heat exchange fin 3, and each elastic strip 9 is bent at a certain angle, and the specific bending angle can be set between 15 and 30 degrees.

[0038] In this embodiment 3, the elastic strip 9 is designed so that during the defrosting process, the external air is blown into the air duct between the adjacent first heat exchange fins 2 and the second heat exchange fins 3. When the wind blows downward, it can act on the elastic strip 9, so that the elastic strip 9 can generate slight vibrations, thereby accelerating the sliding of the frost attached to the first heat exchange fins 2 or the second heat exchange fins 3 after melting, thereby improving the defrosting effect of the entire heat exchanger.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic defrosting thin-diameter fin-tube heat exchanger, comprising an outer frame, It is characterized in that A plurality of first heat exchange fins and second heat exchange fins are alternately arranged in the outer frame, a plurality of expansion holes and a plurality of through holes are provided on the first heat exchange fin, and the aperture of the expansion hole is smaller than the aperture of the through hole, the second heat exchange fin is provided with a through hole aligned with each expansion hole on the first heat exchange fin and an expansion hole aligned with each through hole, a plurality of the expansion holes of the first heat exchange fins are commonly connected to a first heat exchange tube, a plurality of the expansion holes of the second heat exchange fins are commonly connected to a second heat exchange tube, one end of the first heat exchange tube and the second heat exchange tube are connected to a feed three-way valve, and the other end of the first heat exchange tube and the second heat exchange tube are connected to a discharge three-way valve.

2. The automatic defrosting thin-diameter fin-tube heat exchanger according to claim 1, It is characterized in that The plurality of expansion holes and the plurality of through holes on the first heat exchange fins are arranged in a row, and the first heat exchange tube passes through the expansion holes on the first heat exchange fins in an S-shape. The plurality of expansion holes and the plurality of through holes on the second heat exchange fins are also arranged in a row, and the second heat exchange tube passes through the expansion holes on the second heat exchange fins in an S-shape.

3. The automatic defrosting small diameter fin-tube heat exchanger according to claim 1, It is characterized in that The plurality of expansion holes and the plurality of through holes on the first heat exchange fins are arranged in multiple rows, and the plurality of the first heat exchange tubes pass through the corresponding expansion holes on the first heat exchange fins in an S-shape. The plurality of expansion holes and the plurality of through holes on the second heat exchange fins are arranged in multiple rows, and the plurality of the second heat exchange tubes pass through the corresponding expansion holes on the second heat exchange fins in an S-shape.

4. The automatic defrosting small diameter fin-tube heat exchanger according to claim 3, It is characterized in that Tube end connecting pipes are connected between both ends of the plurality of first heat exchange tubes and the second heat exchange tubes, the feed three-way valve is arranged between the tube end connecting pipes at the same end of the first heat exchange tube and the second heat exchange tube, and the discharge three-way valve is arranged between the tube end connecting pipes at the other same end of the first heat exchange tube and the second heat exchange tube.

5. The automatic defrosting small diameter fin-tube heat exchanger according to claim 1, It is characterized in that The lower ends of the first heat exchange fin and the second heat exchange fin are punched to form a plurality of elastic strips arranged at intervals, and the elastic strips are bent at a certain angle.

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