CN207585153U - A kind of microplate falling film evaporation cold heat exchanger - Google Patents

Abstract

The utility model belongs to refrigerating field more particularly to evaporation cold heat exchanger.A kind of microplate falling film evaporation cold heat exchanger, including heat exchanger plates, connecting tube and heat exchanger plates collector, heat exchange plate hole is evenly distributed on heat exchanger plates collector, connecting tube is plugged in heat exchange plate hole, heat exchanger plates are symmetrically equipped with connecting tube in upper and lower side, connecting tube is plugged in heat exchange plate hole, and heat exchange plate is provided on the heat exchanger plates between connecting tube.By being fixed with corrugated fin up and down between heat exchange plate, there are micro gaps to be not directly contacted with for corrugated fin and heat exchange plate, it is disturbed when outdoor circulating wind is flowed through between plate by corrugated fin and strengthens the air side coefficient of heat transfer, in promoting moisture constantly from heat exchanger fin surface evaporation to air, the water capacity of air is discharged in increase by wind turbine, takes away the evaporation latent heat of more water.

Description

A Microplate Falling Film Evaporative Cooling Heat Exchanger

technical field

The utility model belongs to the refrigeration field, in particular to an evaporative cooling heat exchanger.

Background technique

The evaporative condenser, also known as the evaporative cooler, uses water and air as the cooling medium, and uses the evaporation of water to take away the cooling heat of the vapor refrigerant. During operation, the cooling water is pumped to the upper nozzle of the cooling tube group, and sprayed evenly on the outer surface of the cooling tube to form a thin water film. The high-temperature gaseous refrigerant enters from the upper part of the cooling tube group and The cooling water absorbs heat and cools to become a liquid and flows out from the lower part, part of the water that absorbs heat evaporates into water vapor, and the rest falls in the lower water collecting pan, which is used by the water pump for recycling, and the fan forces the air to pass through the cooling at a speed of 3-5m/s The exhaust pipe promotes the evaporation of the water film, strengthens the heat release outside the cooling pipe, and makes the heat-absorbed water droplets be cooled by the air during the falling process. The evaporated water vapor is discharged by the fan along with the air, and the unevaporated water droplets are blocked by the dehydrator. Drop back into the water dish.

Evaporative condenser is a kind of high-efficiency and energy-saving heat exchange equipment. Due to its advantages of high heat transfer efficiency, compact structure and convenient installation, it has been widely used in petroleum, chemical, food, pharmaceutical, refrigeration and heating industries. The evaporative condenser uses air and water as the cooling medium, and condenses the refrigerant by absorbing the heat of the refrigerant gas when part of the cooling water evaporates. Most of the traditional evaporative condensers use 1. Steel coils or copper tubes as heat exchanger components. There is disturbance between the tube bundles due to the disturbance of the circulating air. The cooling circulating water cannot fully drip from top to bottom to wet each heat exchange tube. The surface of the heat exchange tube has no special structure, so that the water droplets spread quickly to form a thin water-side liquid film, and there is a problem of poor heat transfer effect in the dry area where there is no drop of water. The heat exchange tube considers processing and strength issues. It adopts a thick-walled light tube with a large diameter, and the heat exchange on the refrigerant side is not enhanced, the laminar flow phenomenon is obvious, and the heat exchange effect is poor if it does not reach the turbulent flow state. 2. The heat exchanger element is bonded and compounded by the heat exchange tube and the metal plate. Although the sprayed circulating water can flow continuously along the metal plate, the refrigerant only walks in the tube and can only pass through the heat exchange tube wall and Fengshui contact heat transfer, there is no refrigerant in the plate, so the utilization rate of the heat exchange area of the overall space of the heat exchanger is low, and the heat transfer resistance is large. 3. The refrigerant channel is blown out between two welded sealed metal plates. The processing technology is complicated. Considering the problem of blowing strength, only thicker iron plates and steel plates can be used. The surface of the material is sprayed with anti-corrosion galvanizing This kind of material has poor thermal conductivity, large flow channel on the refrigerant side and poor heat transfer effect without enhanced heat transfer. Without special treatment on the water side outside the plate, it is not easy to form a thin flat liquid film, which is not conducive to water absorbing heat and evaporating to the circulation by overcoming surface tension. in the air.

The above three types of heat exchangers all have the problems of surface fouling, complicated manufacturing process, high manufacturing cost and difficult cleaning. Heat transfer efficiency, difficult to clean, increase operating costs. At the same time, some evaporative condensers have the disadvantages of complex structure, high processing cost, and many welding points are prone to leakage of welding or leakage of refrigerant.

Utility model content

The technical problem to be solved by the utility model is: aiming at the deficiencies in the prior art, provide a micro-plate falling film evaporative cooling heat exchange system with simple structure, low production cost, which can eliminate surface fouling and realize high-efficiency refrigeration at low condensation temperature device.

In order to realize the purpose of this utility model, adopt following technical scheme to realize:

A micro-plate falling film evaporative cold heat exchanger, including a heat exchange plate, connecting pipes and heat exchange plate headers, heat exchange plate holes are evenly distributed on the heat exchange plate header, and the connection pipes are plugged into the heat exchange plate holes , the heat exchange plate is equipped with connecting pipes symmetrically at the upper and lower ends, the connecting pipes are plugged into the holes of the heat exchange plate, and heat exchange plates are arranged on the heat exchange plate between the connecting pipes.

As a preferred solution, micro liquid homogenizers are installed between the connecting pipes above, and liquid flow holes are uniformly arranged on the micro liquid homogenizers, and corrugated fins are connected to the bottom of the micro liquid homogenizers, and the corrugated fins are set Between the heat exchange plates, there are gaps between the corrugated fins and the heat exchange plates on both sides, and the other end of the corrugated fins is fixed on the connecting pipe on the other side.

As a preferred solution, a plurality of vertically arranged tiny channels are uniformly distributed inside the heat exchange plate.

As a preferred solution, the heat exchange plates are multi-plates evenly distributed with small gaps between them.

As a preferred solution, the heat exchange plate is a plurality of plates embedded and joined to form a whole plate.

As a preferred solution, the heat exchange plate is an integrally formed plate.

As a preferred solution, the tiny channel is a tooth-like structure.

As a preferred solution, the cross-section of each tiny channel is less than 5 square millimeters.

As a preferred solution, the liquid flow holes are in two rows, and three adjacent liquid flow holes are arranged in an equilateral triangle.

As a preferred solution, the plurality of heat exchange plates are connected through a fixing plate, and the other end of the heat exchange plate is provided with a threaded hole, and the threaded hole is inserted into the fixing hole of the fixing plate.

Compared with the prior art, the beneficial effect of the utility model is: corrugated fins are fixed up and down between the heat exchange plates, the corrugated fins and the heat exchange plates leave tiny gaps that do not directly contact, and the outdoor circulating air flow When passing between the plates, the heat transfer coefficient of the air side is enhanced by the disturbance of the corrugated fins, which promotes the continuous evaporation of water from the surface of the heat exchange fins into the air, increases the moisture content of the air discharged by the fan, and takes away more water evaporation Latent heat: cooling water side falling film heat exchange, in the condensation heat exchange process, the refrigerant in the heat exchange plate is exchanging heat with the wind side, and at the same time, there are equal openings along the length direction on both sides of the wall of each micro homogenizer. The liquid flow holes arranged in a triangular shape, the water is sprayed from the liquid flow holes on both sides of the miniature liquid homogenizer to the surface of each heat exchange plate, and the corrugated fins in the middle of the adjacent heat exchange plates are left with the heat exchange plate. The small gap does not directly contact, so that it will not affect the flow of cooling water from top to bottom, but also disturb the water flow on the water side to achieve turbulent flow and enhance the heat transfer coefficient of the water side. The circulating air enters from the upper side of the heat exchanger plate Between the heat exchanger plates, the heat exchanger flows out from the inner bottom, so the air entering the heat exchange plate combined with the gravity of the water film plays a downward drainage effect on the water film, because the surface of the heat exchange plate is coated with a A layer of high-density and stable nano-anti-corrosion super-hydrophilic aluminum coating, the contact angle between water droplets and the nano-coating is small, and the water can quickly spread evenly in the horizontal and vertical directions of the plate to form a thin water film, which helps to reduce The thermal resistance of heat transfer helps water to overcome the surface tension of the liquid and quickly evaporate into the air in contact with low-humidity air. The gravity of the water film slides down quickly to avoid the deposition of dirt on the surface of the heat exchange fins; part of the water evaporates into water vapor and is discharged into the atmosphere. This part of the water undergoes a phase change, and the water molecules absorb a large amount of latent heat of the gaseous refrigerant without phase change. The temperature of the water is further cooled by the outdoor air through the bottom packing and sprayed in a cooling cycle, which ensures that the refrigerant is always exchanging heat at a low temperature and realizes efficient refrigeration with a low condensation temperature; the aluminum alloy material with a hydrophilic anti-corrosion coating is used, and the condensation The side micro-channel heat transfer design strengthens the heat transfer coefficient of the refrigerant side and increases the contact area with the wind and water side.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present utility model;

Fig. 2 is the structural representation of embodiment 2 of the present utility model;

Fig. 3 is the structural representation of embodiment 3 of the present utility model;

Fig. 4 is a structural schematic diagram of the heat exchange plate 1 of the utility model group embodiment 1;

Fig. 5 is a structural schematic diagram of the heat exchange plate 1 of Example 2 of the utility model group;

Fig. 6 is a structural schematic diagram of the heat exchange plate 1 of Example 3 of the utility model group;

Fig. 7 is a schematic structural view of the utility model miniature liquid homogenizer 2;

Fig. 8 is a structural schematic diagram of the utility model corrugated fin 4;

Fig. 9 is a schematic structural view of the utility model fixed plate 5;

Fig. 10 is a schematic structural view of the micro channel 1-5 of the present invention;

Fig. 11 is a structural schematic diagram of the tiny channel 1-5 of the toothed structure of the present invention;

Fig. 12 is a schematic structural view of the plane of the miniature liquid homogenizer 2 of the present invention.

Detailed ways

The specific embodiment of the utility model will be described in detail below according to accompanying drawings 1-12.

Example 1

A microplate falling film evaporative heat exchanger, comprising a heat exchange plate 1, a connecting pipe 1-2 and a heat exchange plate header 3, the heat exchange plate header 3 is evenly distributed with heat exchange plate holes 3-1, The heat exchange plate 1 is plugged into the hole 3-1 of the heat exchange plate, and the upper and lower ends of the heat exchange plate 1 are symmetrically equipped with connecting pipes 1-2, and the heat exchange plate 1 between the connecting pipes 1-2 is provided with heat exchange plates 1-3, the heat exchange plate 1-3 is a plurality of plates inlaid and joined together to form a whole plate, and there are many vertically arranged tiny channels 1-5 evenly distributed inside the heat exchange plate 1-3, one of which The micro liquid homogenizer 2 is installed between the connecting pipes 1-2 on the side, the micro liquid homogenizer 2 is evenly provided with flow holes 2-1, and the bottom of the micro liquid homogenizer 2-1 is connected with corrugated The other end of the corrugated fin 4 is fixed on the connecting pipe 1-2 on the other side, and the surface of the heat exchange plate 1-3 is coated with a layer of high-density and stable nano anti-corrosion super-hydrophilic aluminum coating The corrugated fins 4 are arranged between the heat exchange plates 1-3, and there are gaps between the corrugated fins 4 and the heat exchange plates 1-3 on both sides, wherein the heat exchange plates 1-3 is an integrally formed plate. This structure is difficult to manufacture in the early stage, but the diffusion effect is best after water hits the surface.

During the condensation heat exchange process, the cooling circulating water is sprayed onto the heat exchanger through the first-stage general spray pipe, and at the same time, the refrigerant enters the heat exchange plate 1 from the heat exchange plate header 3 above the heat exchange plate 1 -3 inside, flows into the tiny channel 1-5 through the connecting pipe 1-2, finally flows out from the lower connecting pipe 1-2, and flows out of the heat exchanger from the lower heat exchange plate header 3. The cooling circulating water entering the heat exchanger from above flows into the miniature liquid homogenizer 2, overflows from the liquid flow hole 2-1 after being filled with water, and the water will flow to the surface of the heat exchange plates 1-3 on both sides, or flow on the The corrugated fins 4, due to the fluttering of the wind, the water on the corrugated fins 4 flows downwards and also flows to the surfaces of the heat exchange plates 1-3 on both sides, and finally the remaining cooling circulating water enters the heat exchanger. The water collector at the lower part of the heater is re-sucked back into the spray pipe for re-spraying.

Example 2

The heat exchange plates 1-3 are multi-plates evenly distributed with small gaps between them. The difference from Example 1 is that the process is less difficult, but there will be interruptions between the water flows, and more cooling circulating water will be collected. The thickness of the heat exchange plates 1-3 can be made thinner, and the relatively thin refrigerant condenses The effect will be more obvious.

Example 3

The heat exchange plates 1-3 are multiple plates inlaid and connected to form a whole plate. The difference from Example 1 is that there is a channel inside the plate, and the one-time molding process is relatively difficult. The heat exchange plate, 1-3, is a plurality of plates inlaid to form a whole plate. The gap is reduced so that the water flow will not be interrupted. So choose the way of inlaid welding.

Example 4

The difference from Example 1 is that the tiny channel is a toothed structure, and the multiple internal teeth in the channel can change the refrigerant flow state into turbulent flow, increase the Reynolds number of the fluid, enhance heat transfer, and contact the fluid per unit volume with the flow channel The area is much larger than conventional size heat exchangers.

Example 5

On the basis of Example 1, the liquid flow holes 2-1 are in two rows, and the three adjacent liquid flow holes are arranged in an equilateral triangle. The plurality of heat exchange plates 1 are connected by a fixing plate 5, and the heat exchange plates The other end of 1 is provided with threaded hole 1-4, and threaded hole 1-4 is plugged in the fixed hole 5-1 of fixed plate 5. Such a splitting effect is better, and the water flows onto the corrugated fins 4 more evenly.

Claims (10)

1. A micro-plate falling film evaporative cooling heat exchanger is characterized in that it comprises a heat exchange plate, connecting pipes and heat exchange plate headers, heat exchange plate holes are evenly distributed on the heat exchange plate headers, and the connecting pipes are plugged In the holes of the heat exchange plate, the upper and lower ends of the heat exchange plate are symmetrically equipped with connecting pipes, the connecting pipes are plugged into the holes of the heat exchange plate, and heat exchange plates are arranged on the heat exchange plate between the connecting pipes. 2. A kind of micro-plate falling film evaporative heat exchanger according to claim 1, characterized in that, a miniature liquid homogenizer is installed between the connecting pipes above, and a flow liquid is evenly arranged on the micro liquid homogenizer. holes, the bottom of the miniature homogenizer is connected with corrugated fins, which are arranged between the heat exchange plates, and there are gaps between the corrugated fins and the heat exchange plates on both sides, and the corrugated fins The other end is fixed on the connecting pipe on the other side. 3 . The microplate falling film evaporative cooling heat exchanger according to claim 2 , wherein the liquid flow holes are in two rows, and three adjacent liquid flow holes are arranged in an equilateral triangle. 4 . 4. A kind of micro-plate falling film evaporative heat exchanger according to claim 2, characterized in that, the plurality of said heat exchange plates are connected by a fixed plate, and the other end of the heat exchange plate is provided with a threaded hole, and the threaded The holes are plugged into the fixing holes of the fixing plate. 5 . The microplate falling film evaporative cooling heat exchanger according to claim 1 , wherein a plurality of vertically arranged tiny channels are evenly distributed inside the heat exchange plate. 6 . 6 . The microplate falling film evaporative cooling heat exchanger according to claim 5 , wherein the microchannels are tooth-like structures. 7 . 7 . The microplate falling film evaporative cooling heat exchanger according to claim 6 , wherein the cross-section of each tiny channel is less than 10 square millimeters. 8 . The microplate falling film evaporative cooling heat exchanger according to claim 5 , wherein the heat exchange plates are multi-plates evenly distributed with small gaps between them. 9 . The microplate falling film evaporative cooling heat exchanger according to claim 5 , wherein the heat exchange plate is a plurality of plates mosaiced and connected to form a whole plate. 10 . 10 . The microplate falling film evaporative cooling heat exchanger according to claim 5 , characterized in that, the heat exchange plates are integrally formed plates. 11 .