CN219776039U - Fin and flooded evaporating pipe - Google Patents

Abstract

The utility model relates to a fin and a flooded evaporating pipe. A fin includes a fin root and a secondary fin disposed on the fin root, the secondary fin being provided with a plurality of layers with gaps left between each layer. Gaps among the layers of auxiliary fins are equivalent to vaporization cores, and the more vaporization cores are, the better the heat transfer effect is. The utility model provides a full liquid evaporating pipe includes fin and pipe, the fin equipartition is provided with the clearance between two adjacent fins of axis direction at the pipe on the pipe, is provided with the clearance between two adjacent fins of pipe circumference, can form the efflux between two adjacent vice fins, can improve evaporating pipe's heat transfer efficiency.

Description

Fin and flooded evaporating pipe

Technical Field

The utility model relates to the field of air conditioning and refrigerating systems, in particular to a flooded evaporator tube.

Background

The liquid filling evaporation pipe is used in the air conditioner refrigerating system, the circulating medium is moved in the liquid filling evaporation pipe, the outside of the pipe is soaked in liquid Freon, the Freon is heated by the circulating medium in the pipe, the Freon is vaporized and absorbs heat, the surface is boiled vigorously, and finally the air is changed into gas to enter the compressor, so that the circulation is completed. Methods commonly employed to enhance heat transfer efficiency are increasing surface area, increasing surface convection coefficient, and increasing the number of vaporization cores.

In the current practical production, a copper-based alloy is adopted as a raw material of the flooded evaporating pipe, fins are processed on the copper-based alloy, and the fins are arranged to increase the surface area of the flooded evaporating pipe, so that the aim of enhancing the heat transfer efficiency is fulfilled.

The use cost of the copper-based alloy is increased along with the reduction of copper resources, and the service life of the copper-based alloy heat exchange tube is greatly shortened because of environmental pollution and poor water quality, and the current trend for controlling the cost and improving the service life of products is to begin to adopt stainless steel, titanium and other materials to replace the copper-based alloy to produce the full-liquid evaporation tube, but the hardness of the stainless steel and the titanium materials is far higher than that of the copper-based alloy, so that the height of fins processed on the stainless steel material is shortened by 1/3 to 1/2 relative to that of fins processed on the copper-based alloy under the same condition; this further results in a reduced surface area of the flooded evaporator tubes made of stainless steel, which reduces the overall heat transfer efficiency. Therefore, a new fin needs to be designed, the surface convection coefficient is improved and the vaporization core number is increased under the condition that the height of the fin cannot be increased, so that the heat transfer efficiency of the stainless steel fin reaches the heat transfer efficiency of the copper-based alloy fin.

For example, in the prior art, the application publication number is CN 112082418A, and the name is "an evaporating tube for a shell-and-tube heat exchanger and a manufacturing method thereof", in this technical scheme, a groove and at least one groove sub-fin are formed on the top of a main fin, a first portion and a second portion of the groove sub-fin are formed on two sides of the groove, the first portion of the groove sub-fin is larger than the second portion of the groove sub-fin, a first boiling cavity is formed by the channel, the main fin, the first portion of the groove sub-fin, and the second portion of the groove sub-fin on an adjacent main fin, and a second boiling cavity is formed by the groove and the first portion of the groove sub-fin.

Under the existing processing conditions, when the fins are processed on stainless steel, the overall height of the fins is reduced compared with that of the fins processed on copper-based alloy, so that the outer surface area of the whole evaporating tube is reduced, and the heat transfer efficiency of the whole evaporating tube is affected.

Disclosure of Invention

The utility model provides a tree-shaped tooth form, which aims to solve the problem that the heat transfer efficiency is low because fins with the same specification on a copper alloy cannot be processed on a stainless steel material, and more vaporization cores are arranged on a single fin, so that the heat transfer efficiency of a stainless steel evaporation tube reaches or is close to that of the copper-based alloy evaporation tube.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a fin, includes the fin, the fin includes root of a wing and vice fin, vice fin sets up on the root of a wing, vice fin is provided with the multilayer and is provided with the clearance between every layer of vice fin.

In the technical scheme, the gaps among the auxiliary fins are equivalent to a small pit, so that a vaporization core is formed; the more layers are equal to the more vaporization cores, the more vaporization cores are, and the heat transfer capacity of the rear fins is correspondingly improved. When the fin is used, the whole fin is soaked in liquid, the liquid in the gap between the auxiliary fins is smaller than the average pressure in the liquid due to the action of tension, the pressure is reduced, and the boiling point of the liquid is also reduced. Therefore, the liquid can boil earlier and generate bubbles, the bubbles can be cut into small bubbles by the fins, the poor adhesion force of the small bubbles can be quickly separated from the fins, and heat absorption is completed. If no fin divides the air bubble into small air bubbles, the adhesion force of the large air bubbles is stronger than that of the small air bubbles, and the large air bubbles are not easy to separate, when the generation speed of the air bubbles is larger than the separation speed, the air bubbles can be piled up to form a layer of air film, so that the liquid can not contact the surface of the fin, the heat dissipation effect of the air is smaller than that of the liquid, and the heat dissipation effect of the fin can be rapidly reduced.

Preferably, the width of the fin root is 0.8 times or more the height of the fin.

In the technical scheme, more auxiliary fins can be scraped as the width of the fin root is wider, and the situation that the auxiliary fins cannot be scraped at two sides of the fin root due to the fact that the width of the fin root is too small is avoided by limiting the width of the fin root.

Preferably, the widths of the auxiliary fins of each layer are sequentially increased from top to bottom.

In the technical scheme, compared with the whole fin, the thickness of the auxiliary fin is much smaller, the cutting force required during processing is smaller, the side surface of the fin root can be scraped by a round blade with an angle of 80-90 degrees, and the scraping is stopped by a cutter when the fin root is scraped to about half of the height of the fin root, so that the auxiliary fin can be obtained; the cut fin roots can expose new side surfaces, and new auxiliary fins can be obtained by cutting the side surfaces again by adopting a round blade with an 80-90-degree cutting edge, but the width of the auxiliary fins is reduced compared with the width of the auxiliary fins processed in the prior art; repeating the above actions to obtain a plurality of layers of auxiliary fins; when the fin root cannot be shaved after multiple times of shaving, the allowance of the top of the fin root is small, and the force born by the small top of the fin root is also small, so that the force required for flattening the top of the fin root is also small, the top of the fin root can be flattened through a polishing wheel, and the auxiliary fin positioned at the top of the fin root can be obtained; the width of the processed auxiliary fins increases from top to bottom.

The utility model provides a full liquid evaporating pipe, includes vice fin and pipe, vice fin equipartition is in the pipe periphery, is provided with the clearance between two fins that the pipe axis direction is adjacent, is provided with the clearance at two fins that the pipe circumference is adjacent.

In the technical scheme, when in use, the outer part of the circular tube is soaked in liquid Freon, and the inner part of the circular tube is circulated with a circulating medium; the circulating medium heats and transfers heat to the liquid freon through the fins, the liquid freon is vaporized to generate bubbles, and the bubbles are separated from the round tubes and the fins from gaps between the fins; the liquid freon completes vaporization and absorbs heat to enter the compressor to complete circulation. The auxiliary fins of two adjacent fins can form a structure with gaps at the upper part of the bottom, the bottom of the structure absorbs heat and is vaporized drastically, the opening is small, the flow velocity of bubbles and liquid is increased drastically and separated from the structure, and jet flow is formed, namely the surface convection heat transfer coefficient is increased drastically. And meanwhile, after the jet flow is finished, negative pressure is formed in the cavity, surrounding liquid can be absorbed and quickly collected, and secondary jet flow is formed. So doing, the overall effect exhibited is a significant increase in convective heat transfer coefficient.

In the technical scheme, threads can be machined in a mode of machining through threads, then a knurling cutter is used for cutting off the threads to machine fin roots with uniform circumferential intervals, auxiliary fins are machined on the fin roots, and two adjacent bottom auxiliary fins in the axial direction of the circular tube form a gap with large bottom and small upper gap. When in use, the outside of the circular tube is soaked in liquid Freon, and the inside of the circular tube is circulated with a circulating medium; the circulating medium heats and transfers heat to liquid freon through the fins, and bubbles generated by vaporization of the liquid freon are separated from the round tubes and the fins; the liquid freon completes vaporization and absorbs heat to enter the compressor to complete circulation.

Preferably, the number of the fins in the axial direction of the circular tube is 32-42 per inch.

In the technical scheme, the heat absorption capacity of the whole evaporation tube is prevented from being influenced by the fact that the number of the fins is too small in the same size specification by limiting the number of the fins.

Preferably, the distance between two adjacent tree-shaped auxiliary fins in the circumferential direction of the circular tube is 0.3-0.8 mm.

In the technical scheme, the influence of fin reduction on heat absorption caused by overlarge distance is avoided by limiting the distance between two adjacent auxiliary fins, or the air bubbles generated by vaporization of liquid Freon cannot be separated from round tubes or fins due to overlarge distance.

Preferably, the periphery of the circular tube is provided with threads, and the fins are arranged on the periphery of the circular tube according to the track of the threads.

In the technical scheme, threads can be machined on the periphery of the round tube in a thread machining mode, then the knurling cutter is used for cutting off the threads to machine fin roots with uniform intervals, auxiliary fins are machined on the fin roots, and the fin forming machining is facilitated by the aid of the arrangement.

Preferably, the thread lead angle of the thread is less than 1 degree.

Preferably, the thread is a single thread.

In the technical scheme, compared with multi-thread machining, single-thread threading is simpler and lower in cost.

Compared with the prior art, the utility model has the beneficial effects that:

1. a plurality of auxiliary fins are arranged on the single fin, gaps are formed among the auxiliary fins, the more the gaps are, the more vaporization cores are formed, and the more the vaporization cores are, the higher the heat transfer efficiency is.

2. The plurality of auxiliary fins are arranged on the single fin, and the more the auxiliary fins are, the larger the surface area of the single fin is, so that the heat transfer efficiency can be improved.

3. A structure with a gap at the upper part of the bottom is formed between two adjacent fins on the evaporating pipe, and jet flow can be formed when the evaporator is used, namely, the surface convection heat transfer coefficient is increased, so that the heat exchange efficiency of the evaporating pipe is effectively improved.

Drawings

FIG. 1 is a schematic diagram of a fin structure;

FIG. 2 is a three-dimensional view of a flooded evaporator tube;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a left side view of FIG. 2;

FIG. 5 is a cross-sectional view taken along B-B in FIG. 4;

fig. 6 is a partial enlarged view at a in fig. 5.

1. Fins, 11, fin roots, 12, auxiliary fins and 2, circular tubes.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

The same or similar reference numbers in the drawings of embodiments of the utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", "long", "short", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, and it is not necessary to indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present patent, and it is possible for those of ordinary skill in the art to understand the specific meaning of the terms described above according to the specific circumstances.

The technical scheme of the utility model is further specifically described by the following specific embodiments with reference to the accompanying drawings:

example 1

As shown in fig. 1, a fin comprises a fin 1, wherein the fin 1 comprises a fin root 11 and auxiliary fins 12, the auxiliary fins 12 are arranged on the fin root 11, the auxiliary fins 12 are provided with multiple layers, and gaps are arranged between every two layers of auxiliary fins 12.

According to the working principle of the embodiment, when the heat dissipation device is used, the whole fin 1 is soaked in liquid, the fin 1 absorbs heat and transfers the heat to the liquid, and bubbles are generated when the liquid is heated and boiled to dissipate heat. Gaps are reserved among the layers of auxiliary fins 12, and the gaps between the two layers of auxiliary fins are equivalent to a small pit, so that a vaporization core is formed; the liquid in the gaps between the sub-fins 12 is caused to have a pressure smaller than the average pressure in the liquid due to the tension, and the pressure becomes smaller, and the boiling point of the liquid is also lowered. Therefore, the liquid will boil at an earlier boiling temperature and generate bubbles, the bubbles will be cut into small bubbles by the auxiliary fins 12 in the rising process, the adhesion force of the small bubbles will be quickly released, and the heat absorption is completed.

The beneficial effects of this embodiment are: a plurality of heat dissipation cores are arranged on a single fin, and the more the cores are, the stronger the heat dissipation capacity is; through setting up a plurality of vice fins can be with the bubble cutting of liquid boiling production into a plurality of little bubbles, can effectively avoid forming the air film on the surface of fin, avoid influencing the radiating effect.

Example 2

As shown in fig. 1, a fin is different from embodiment 1 in that the width of each layer of sub-fins 12 is gradually widened from top to bottom; the width of the fin root 11 is 0.8 times the height of the fin 1.

The working principle of the embodiment is as follows: by defining the width of the fin root 11, it is ensured that a multi-layered sub fin 12 can be manufactured on the fin root 11 at the time of manufacturing. Compared with the whole fin, the thickness of the auxiliary fin is much smaller, the cutting force required during processing is smaller, a round blade with an 80-90-degree cutting edge can be adopted to cut the side surface of the fin root, and when the fin root is cut to about half of the height, the cutter is retracted to stop cutting, so that the auxiliary fin 12 can be obtained; the cut fin roots can expose new side surfaces, and new auxiliary fins 12 can be obtained by cutting the side surfaces again by adopting a round blade with an 80-90-degree cutting edge, but the width of the auxiliary fins 12 is reduced compared with that of the auxiliary fins 12 processed previously; repeating the above operations to obtain a plurality of layers of auxiliary fins 12; when the fin roots 11 cannot be shaved after multiple shaving, the allowance of the tops of the fin roots 11 is small, and the force born by the small tops of the fin roots 11 is also small, so that the force required for flattening the tops of the fin roots 11 is also small, and the tops of the fin roots 11 can be flattened through a polishing wheel, so that the auxiliary fins 12 positioned at the top can be obtained; the width of the processed auxiliary fins 12 increases from top to bottom.

The beneficial effects of the embodiment are that: compared with the whole fin, the thickness of the auxiliary fin is much smaller, the cutting force required during processing is smaller, and the auxiliary fin is easy to process by the existing equipment or tools; the width of the fins is limited to be gradually widened from top to bottom, so that the auxiliary fins are convenient to process in actual production.

Example 3

As shown in fig. 2-6, the flooded evaporating pipe comprises fins 1 and round pipes 2, wherein the fins 1 are uniformly distributed on the periphery of the round pipes 2, gaps are formed between two adjacent fins 1 in the axial direction of the round pipes 2, and gaps are formed between two adjacent fins 1 in the circumferential direction of the round pipes 1.

The working principle of the embodiment is as follows: when in use, circulating medium circulates in the circular tube 2, and the fins 1 on the periphery of the circular tube 2 are soaked in liquid Freon; when the internal circulation medium becomes hot, the fins 1 absorb heat and transfer the heat to liquid freon, the liquid freon filled in the gaps between the layers of the auxiliary fins 12 and the gaps between the two adjacent auxiliary fins 12 absorbs heat and boils to generate bubbles, and the bubbles are separated from the round tubes 2 and the fins 1 from the gaps between the fins 1, so that heat absorption is completed. The auxiliary fins of two adjacent fins 1 form a structure with gaps at the upper part of the bottom, the bottom of the structure absorbs heat and is vaporized drastically, the opening is small under the constraint of the gaps at the upper part, the flow velocity of bubbles and liquid is increased drastically and separated from the structure, and jet flow is formed, namely the surface convection heat transfer coefficient is increased drastically. And meanwhile, after the jet flow is finished, negative pressure is formed in the cavity, surrounding liquid can be absorbed and quickly collected, and secondary jet flow is formed. So doing, the overall effect exhibited is a significant increase in convective heat transfer coefficient.

The beneficial effects of the embodiment are that: a large number of fins are arranged on the circular tube, and a plurality of heat dissipation cores are arranged on a single fin, namely a large number of heat dissipation cores on the evaporation tube, so that the heat transfer efficiency of the evaporation tube can be effectively improved; when in use, jet flow is formed among the fins 1, so that the convection heat transfer coefficient can be improved, namely, the heat transfer capacity of the evaporation tube can be improved.

Example 4

As shown in fig. 2-6, a flooded evaporator tube is mainly different from embodiment 3 in that the fins 1 are 34 fins per inch in the axial direction of the round tube 2; the distance between two circumferentially adjacent fins was 0.6mm.

The other technical features and the working principle are the same as those of embodiment 3.

The beneficial effects of the embodiment are that: more fins can be arranged on the circular tube by controlling the distance between the fins, so that the heat dissipation effect is prevented from being poor due to too few fins, and the heat transfer efficiency is also prevented from being low due to too dense fins.

Example 5

As shown in fig. 2-6, a flooded evaporation tube is mainly different from embodiment 3 in that the outer circumference of the circular tube 2 is provided with threads, the threads are single-line threads, and the thread lead angle is 0.8 degrees; the fins 1 are uniformly arranged on the periphery of the round tube 2 according to the track of the threads. During production and processing, threads 1 can be firstly processed on the circular tube 1, then the knurling tool is used for cutting threads to process the fin roots 11, and the auxiliary fins 12 are cut on the fin roots 11 to process the fins 1.

The other technical features and the working principle are the same as those of embodiment 3.

The beneficial effects of the embodiment are that: the fins are arranged on the periphery of the circular tube according to the track of the threads, the threads can be machined on the periphery of the circular tube in a thread machining mode in reality, and the fins are machined on the threads, so that actual production is facilitated.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model as set forth in the claims.

Claims (7)

1. The fin is characterized by comprising a fin (1), wherein the fin (1) comprises a fin root (11) and auxiliary fins (12), the auxiliary fins (12) are arranged on the fin root (11), multiple layers of auxiliary fins (12) are arranged, and gaps are arranged between every two layers of auxiliary fins (12); the width of the fin root (11) is more than or equal to 0.8 times of the height of the fin (1); the width of each layer of the auxiliary fin (12) is sequentially increased from top to bottom.

2. The flooded evaporation tube is characterized by comprising a circular tube (2) and the fins (1) of claim 1, wherein the fins (1) are uniformly distributed on the periphery of the circular tube (2), a gap is formed between two fins (1) adjacent to each other in the axial direction of the circular tube (2), and a gap is formed between two fins (1) adjacent to each other in the circumferential direction of the circular tube (2).

3. A flooded evaporator tube as in claim 2 wherein the fins (1) are 32-42 fins per inch in the direction of the axis of the tube (2).

4. A flooded evaporator tube as claimed in claim 2, wherein the spacing between two circumferentially adjacent fins (1) is 0.3mm to 0.8mm.

5. The flooded evaporator tube of claim 2, wherein threads are provided on the outer circumference of the circular tube (2), and the fins (1) are uniformly provided on the outer circumference of the circular tube (2) according to the track of the threads.

6. A flooded evaporator tube as claimed in claim 5, wherein the thread has a thread lead angle of less than 1 degree.

7. A flooded evaporator tube as in claim 5 wherein the threads are single-line threads.