Integral type double-oppositely-distributed louver fin pipeline evaporator

Abstract

The utility model discloses an integral double-oppositely-distributed louver fin pipeline evaporator, which comprises an upper baffle, a lower baffle and a louver fin group, the upper baffle and the lower baffle are arranged in parallel, and the louver fin group is positioned between the upper baffle and the lower baffle and is connected with the upper baffle and the lower baffle through a long U-shaped bent pipe in a penetrating manner, and is characterized in that each louver fin comprises a substrate which is provided with a straight insertion hole matched with the long U-shaped bent pipe; window fins are symmetrically arranged relative to the straight insertion hole; the window fins are of a shutter structure which is integrated with the substrate; the fin inclination angles of the window fins symmetrically arranged on the two sides of the straight inserting hole are opposite. Through multiple turbulent flow effects, the turbulent flow effect is enhanced, air forms strong turbulent flow in a flow channel, the forming time of a thermal boundary layer is shortened, and therefore the heat exchange effect is enhanced, dust attachment is reduced, and the fins are not prone to deformation.

Description

Technical Field

[0001] The utility model relates to evaporator technology, in particular to an integral two-way distributed louver finned tube evaporator for a freezer. Background Art

[0002] The evaporator is one of the key components in the refrigeration process. The condensed liquid after being cooled and depressurized by the capillary tube exchanges heat with the outside air through the evaporator, and achieves the refrigeration effect by gasification and heat absorption. In the prior art, for the direct-insert finned evaporator used in freezers, the system heat exchange capacity requirement is higher. Generally, flat fins and single-phase distributed louvers are used on the current common finned tube evaporators.

[0003] For example, a finned evaporator for a freezer with the patent publication number CN208567205U includes front and rear row evaporator bodies; both sides of the front and rear row evaporator bodies are fixed to the inner surfaces of the slot holes of the left and right evaporator brackets; outlet ends B and inlet ends A are respectively arranged on the coil pipes of the front and rear row evaporator bodies; the outlet end B is fixed to the inlet end A; front row and rear row evaporator fins are respectively fixed in the pipelines of the front and rear row evaporator bodies. Another example is the parallel flow evaporator used on a refrigerator / freezer disclosed in the patent publication number CN108626915A, which includes a blown plate, and microchannel pipelines with a size not greater than 1 mm are printed on the blown plate. The inlets and outlets on the microchannel pipelines in the blown unit volume converge and then converge with the interfaces on the ends of the blown plate. Due to the existence of the microchannels, the heat exchange between the evaporator body and the refrigerant is quickly completed. Due to the existence of the fins, the heat dissipation surface area of the evaporator body is increased, and the heat exchange between the evaporator body and the internal environment of the refrigerator or freezer is completed.

[0004] In these disclosed flat finned tube evaporators in the prior art, the fins are fixed to the evaporator in a flat state. Since the flat fins only have a very small disturbance and stirring effect on the air flow, their heat transfer performance is not ideal, and thus it is easy to accumulate dust and dirt, further reducing the heat transfer efficiency.

[0005] For the single-phase distributed louver evaporator, only two groups of window fins are arranged facing each other in the single-phase distribution. After the air enters the fins, although it can change the air flow direction and also interrupt the growth of the thermal boundary layer, thereby achieving the purpose of enhancing heat transfer; however, these window fins only adopt a single facing distribution, and the achieved disturbance is limited. For equipment such as freezers with high refrigeration requirements, the heat exchange effect is still insufficient. Summary of the Invention

[0006] The purpose of the present utility model is to solve the above problems and provide an integral double-phase distributed louver finned tube evaporator. Without changing the volume of the evaporator, an integral and double-phase distributed louver fin with higher heat transfer efficiency is designed, which has the effect of strengthening the flow disturbance, making the air form a strong flow disturbance in the flow channel, and shortening the formation time of the thermal boundary layer and other characteristics.

[0007] The above technical problems of the present utility model are mainly solved by the following technical solutions: An integral double-phase distributed louver finned tube evaporator includes upper and lower baffles arranged in parallel, and a louver fin group connected by long U-shaped bent tubes passing through between the upper and lower baffles. The louver fins are characterized in that they include a base plate, and straight insertion holes matching with the long U-shaped bent tubes are provided on the base plate, and window fins are symmetrically arranged with the straight insertion holes; the window fins are a louver structure integrated with the base plate; the fin angles of the window fins symmetrically arranged on both sides of the straight insertion holes are opposite.

[0008] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, the base plate is a rectangular plate structure, and two straight insertion holes are provided. The two straight insertion holes are symmetrically arranged on the base plate with the length midline of the base plate as the symmetry axis; the distance between the two straight insertion holes is equal to the pipe distance between two parallel pipes of the long U-shaped bent tube.

[0009] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, the window fins are arranged on both sides of the straight insertion holes with the straight insertion holes as the symmetry center, and the fin angles of the window fins on both sides are opposite.

[0010] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, flanges are provided at the orifices of the straight insertion holes, and the flanges and the base plate are an integral structure; the surface of the tube body of the long U-shaped bent tube is in interference fit with the flanges.

[0011] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, the window fins symmetrically arranged with the straight insertion holes are left window fins and right window fins. The areas of the left window fins and the right window fins are equal or different, and the number of fins in the left window fins and the right window fins is the same or there is a difference in quantity.

[0012] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, the fin angle B of the window fins is 30°±5°.

[0013] In the above-mentioned integral double-phase distributed louver finned tube evaporator, preferably, the fins of the window fins are arc surface structures, and the chord length of the fins is a length value within the range of 22° to 30° of the radian.

[0014] In the aforementioned integral double-directional distributed louver finned tube evaporator, preferably, the flanging extends towards the single-sided direction of the substrate, and the height of the window fins in this single-sided direction is flush with the flanging or lower than the height of the flanging.

[0015] In the aforementioned integral double-directional distributed louver finned tube evaporator, preferably, both ends of the long U-shaped bent tube are respectively connected to the refrigerant inlet tube and the refrigerant outlet tube, and an oil storage tank is connected to the refrigerant outlet tube.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] Based on the basic structure of the existing evaporator, including upper and lower baffles and a louver fin group penetrated and connected by a long U-shaped bent tube, without changing the volume of the evaporator. On this basis, the louver fins are redesigned. The window fins and the substrate are still an integral louver structure. The window fins are arranged on both sides of the straight insertion hole with the straight insertion hole as the symmetry center, and the fin angles of the symmetric window fins are opposite, forming a double-directional distribution. According to the aerodynamic principle, this double-directional distributed louver fin has a double turbulence effect. Compared with the traditional louver fin and the flat fin, the turbulence effect is strengthened, enabling the air to form strong turbulence in the flow channel, shortening the formation time of the thermal boundary layer, and thus achieving enhanced heat transfer effect.

[0018] Due to the double turbulence effect of the double-directional distributed louver fins of the present device, the air entering the louver fins can rapidly and continuously fluctuate up and down twice, thus achieving a relatively high disturbance and stirring effect and reducing the adhesion of dust.

[0019] Furthermore, in this solution, the substrate, window fins, straight insertion holes, and flanging are obtained as finished products by an integral stamping die at one time, overcoming the disadvantage that the traditional installed louver fins are prone to deformation under mechanical vibration or wind force. Description of the Drawings

[0020] Figure 1 is a structural schematic diagram of the present utility model.

[0021] Figure 2 is a structural schematic diagram of a louver fin of the present utility model.

[0022] Figure 3 is a front view of a louver fin of the present utility model.

[0023] Figure 4 is Figure 3 the top view of

[0024] Figure 5 is a developed state diagram of the layout structure of a long U-shaped bent tube and louver fins of the present utility model.

[0025] In the figure: 1 - upper baffle, 2 - lower baffle, 3 - long U-shaped bend pipe, 4 - louver fins, 401 - substrate, 402 - straight insertion hole, 403 - left window fin, 404 - right window fin, 405 - flanging, 5 - refrigerant inlet pipe, 6 - refrigerant outlet pipe, 7 - oil storage tank.

[0026] B - sewage discharge area. Specific implementation manner

[0027] The technical solution of the present utility model will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0028] An integral double-phase distributed louver fin pipe evaporator in this embodiment, as Figure 1 shown, includes upper baffle 1 and lower baffle 2 arranged in parallel, four groups of louver fins 4 located between upper baffle 1 and lower baffle 2, and the four groups of louver fins 4 are penetrated and connected by long U-shaped bend pipe 3; both ends of long U-shaped bend pipe 3 are respectively connected to refrigerant inlet pipe 5 and refrigerant outlet pipe 6, and an oil storage tank 7 is installed on refrigerant outlet pipe 6.

[0029] The specific penetration and connection method is: inserting two straight insertion holes 402 on louver fin 4 into the corresponding long U-shaped bend pipe 3, and fixing louver fin 4 to the pipeline one by one by expanding the long U-shaped bend pipe 3, as Figure 5 shown. Then, it is bent inward three times on the left and right to form four groups of seven rows of louver fins 4. Upper baffle 1 and lower baffle 2 are installed at both ends of the bent long U-shaped bend pipe 3, that is, on both sides of the evaporator, to prevent the four groups of louver fins 4 from falling off and to be provided with installation grooves for convenient overall installation. The two open ends of long U-shaped bend pipe 3 are respectively welded to refrigerant inlet pipe 5 and refrigerant outlet pipe 6, and oil storage tank 7 is welded before welding at the refrigerant output end 6 to improve the operation stability and efficiency of the refrigeration system. When working, refrigerant is input from refrigerant inlet pipe 5 of the evaporator, flows through the entire long U-shaped bend pipe 3 and exchanges heat with air through the four groups of louver fins 4 on the long U-shaped bend pipe 3, and then is output from refrigerant outlet pipe 6.

[0030] See Figure 3 、 Figure 4 , a single louver fin 4 includes a rectangular plate structure substrate 401, and two straight insertion holes 402 matching with the long U-shaped bend pipe are provided on substrate 401. The two straight insertion holes 402 are symmetrically arranged on substrate 401 with the length midline of substrate 401 as the symmetry axis. The distance between the two straight insertion holes 402 is equal to the distance between two parallel pipes of long U-shaped bend pipe 3.

[0031] A flanging 405 is provided at the orifice part of the straight insertion hole 402, and the flanging 405 and the substrate 401 are of an integral structure.

[0032] Window fins are symmetrically arranged with respect to the straight insertion holes 402. There are a total of 4 window fins for the two straight insertion holes 402, and the window fins are a louver structure integrated with the substrate 401. The window fins symmetrically arranged with respect to the straight insertion holes 402 are the left window fin 403 and the right window fin 404. In actual applications, the areas of the left window fin 403 and the right window fin 404 are equal according to specific circumstances, or they can be of different sizes; the number of fins in the left window fin 403 and the right window fin 404 is the same, or there can be a difference in the number, such as 3 fins are provided in the left window fin 403 and 2 fins are provided in the right window fin 404.

[0033] The fin inclinations of the window fins symmetrically arranged on both sides of the straight insertion holes 402 are opposite.

[0034] Several main values of the fins of the window fins are as follows: the fin inclination angle B of the window fins is 30° ± 5°; the fins are of an arc surface structure, and the chord length of the fins is the length value within the range of an arc of 22° to 30°; in this embodiment, the flanges 405 of the two straight insertion holes 402 both extend in the single-sided direction of the substrate 401, and the height of the window fin on this single-sided direction is flush with the height of the flange 405, or lower than the height of the flange 405.

[0035] The surface of the tube body of the long U-shaped tube 3 is in interference fit with the flange 405, which is achieved by expanding the tube.

[0036] The above embodiments are descriptions of the present invention, not limitations of the present invention. For example, the window fins are not symmetrically arranged with respect to the straight insertion holes 402, etc. Although the present invention is described in combination with preferred embodiments, it should be understood that the present invention is not limited to the described preferred embodiments. Those skilled in the art can make various equivalent modifications and substitutions to the technical solution of the present invention based on the teachings of the present invention. Therefore, the scope of the present invention should be defined by the claims, and all those equivalent modifications and substitutions fall within the protection scope of the technical solution of the present invention.

Claims

1. An integral double-phase distributed louver finned tube evaporator, comprising upper baffles (1) and lower baffles (2) arranged in parallel, and a group of louver fins (4) connected by long U-shaped bent tubes (3) between the upper and lower baffles, characterized in that The louver fins include a base plate (401), on which there are straight insertion holes (402) for mating with the long U-shaped bent pipe, and window fins are symmetrically arranged with respect to the straight insertion holes; the window fins are of a louver structure integrated with the base plate; The fin angles of the window fins symmetrically arranged on both sides of the straight insertion hole are opposite.

2. The integral double-direction distributed louver finned tube evaporator according to claim 1, characterized in that The base plate (401) is of a rectangular plate structure, and there are two straight insertion holes (402), and the two straight insertion holes are symmetrically arranged on the base plate with respect to the length midline of the base plate; the distance between the two straight insertion holes is equal to the distance between the two parallel pipes of the long U-shaped bent pipe (3).

3. An integral double-directional distributed louver finned tube evaporator according to claim 1 or 2, characterized in that, The orifice of the straight insertion hole (402) is provided with a flanging (405), and the flanging and the base plate (401) are of an integral structure; the surface of the pipe body of the long U-shaped bent pipe (3) is in interference fit with the flanging.

4. An integral double-direction distributed louver finned tube evaporator according to claim 1 or 2, characterized in that The window fins symmetrically arranged with respect to the straight insertion hole (402) are a left window fin (403) and a right window fin (404), the areas of the left window fin and the right window fin are equal or different, and the number of fins in the left window fin and the right window fin is the same or there is a difference in number.

5. The integral double-directional distributed louver fin tube evaporator according to claim 1, wherein The fin angle B of the window fin is 30° ± 5°.

6. The integral double-direction distributed louver finned tube evaporator according to claim 1 or 5, characterized in that, The fins of the window fin are of an arc surface structure, and the chord length of the fin is a length value within the range of a radian of 22° to 30°.

7. An integral double-direction distributed louver finned tube evaporator according to claim 3, characterized in that, The flanging (405) extends in the single-sided direction towards the base plate (401), and the height of the window fin in this single-sided direction is flush with the flanging or lower than the height of the flanging.

8. The integral two-way distributed louver finned tube evaporator according to claim 1, characterized in that Both ends of the long U-shaped bent pipe (3) are respectively connected to a refrigerant input pipe (5) and a refrigerant output pipe (6), and an oil storage tank (7) is connected to the refrigerant output pipe.

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