CN2924457Y

CN2924457Y - Intermittent spiral oval coiled-tube evaporating condensator

Info

Publication number: CN2924457Y
Application number: CN 200620061653
Authority: CN
Inventors: 朱冬生; 蒋翔; 唐广栋
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2006-07-14
Filing date: 2006-07-14
Publication date: 2007-07-18
Anticipated expiration: 2016-07-14

Abstract

The utility model relates to an intermittently-spiral oval coil evaporative condenser, the condenser adopts spiral oval tube as the heat transfer tube; the spiral oval tube has intermittent distorted spiral, the spiral segment and the oval segment are alternatively distributed with equal space, the heat transfer tubes of the spiral segment and the oval segment have the same oval cross section, and show a 360 degree spiral change along the axial direction; the length of each spiral segment or oval segment along the length direction of the spiral or oval tube, namely, the pitch of strand, is 200mm-400mm; the ratio of the long axis to the short axis of the oval segment is 3:2. The condenser can make the spray water wet the surface of the coil to the largest extent, the fluid layer at the tube surface gets thin, which can improve the heat transfer effect and promote the evaporation and heat exchange.

Description

Be interrupted the oval coil pipe evaporative condenser of spiral

Technical field

The utility model relates to heat-exchange device, the oval coil pipe evaporative condenser of a kind of specifically interruption distortion spiral.

Background technology

Existing evaporative condenser structure mainly is made of blower fan, shelves water plate, nozzle, heat transfer coils, casing, water storage tank, water pump, moisturizing control valve.Its course of work is: the top of heat transfer coils delivered to cooling water pressure in the tank by water pump, evenly be sprayed onto on the coil pipe through nozzle, outside coil pipe, pass through sensible heat and latent heat heat exchange, make the refrigerant vapour condensation, fraction is evaporated in the air, and unevaporated cooling water falls back in the water leg; Blower fan makes air enter and blow over heat exchange coil from top to bottom from bottom half, with the outer cooling water heat exchange of pipe, takes away part moisture; Shelves water plate will be carried secretly to such an extent that water droplet is separated in the air.As seen, heat exchange coil is the heat exchange place of fluid in the evaporative condenser, is the key that improves the evaporative condenser performance.

The pipe kind of evaporative condenser heat exchange coil has light pipe and finned tube, the tubular elliptical tube that has common pipe and U.S. benefit Mei Gao company to patent.Finned tube when coil pipe tube bank given volume, has increased heat transfer area with respect to light pipe, forms secondary stream simultaneously, has increased the less turbulence of fluid, helps conducting heat; To increase area limited but finned tube has institute, and need the shortcoming of extra assembling, maintenance, inspection or cleaning.Tubular aspect, U.S. Pat-4,755,331 disclose a kind of evaporative condenser replaces common pipe with elliptical tube, elliptical tube has increased heat transfer area, thereby has increased thermal capacity, has improved heat-transfer effect, secondary stream can't be formed but elliptical tube also has, the shortcoming of less turbulence can't be increased; And oval tubular be that single face soaks pipe, having shower water can't comprehensive wetting coil surface, the heat exchanging area is used inadequately shortcoming fully.In order to improve elliptical tube, bibliographical information a kind of alternating curved bellows, this pipe can produce secondary stream, increase less turbulence, abundant wetting surface, alternating curved bellows be the alternation distortion on air-flow direction, though increased the air turbulence, but increased gas-flow resistance, unfavorable to evaporation and heat-exchange.

The utility model content

The purpose of this utility model is the shortcoming that exists at prior art, has proposed the oval coil pipe evaporative condenser of a kind of high efficiency interruption spiral.

The oval coil pipe evaporative condenser of described interruption spiral can make the wetting coil surface of shower water maximum area, thereby effective heat exchange area is increased, and when shower water flows through coil surface, make the fluid layer attenuation by forming secondary stream and action of centrifugal force, disturbance simultaneously increases the Hydrodynamic turbulence degree, fluid layer attenuation and less turbulence increase all can increase the coefficient of heat transfer, the air pressure dimensionality reduction is held very lowly in addition, promptly on air-flow direction, keep high flow velocities, promote evaporation and heat-exchange, and do not need or increase extra input work tinily.

For achieving the above object, the oval coil pipe evaporative condenser of interruption spiral of the present utility model is characterized in that using the spiral elliptical tube as heat-transfer pipe; Described spiral elliptical tube is to be interrupted the distortion spiral, and spiral section is alternately arranged with oval section is equidistant, and spiral section is identical ellipse with oval section heat-transfer pipe cross section, and continuous vertically 360 degree spirals change; The length of each spiral section or oval section on the described spiral elliptical tube pipe range direction, promptly torque is 200-400mm; Described oval segment length's axle is 3: 2 with the ratio of minor axis.

Described spiral elliptical tube fillet need not processed, and keeps the pipe section, by being welded to connect, arranging and is mounted to tube bank according to common pipe and get final product.

The utility model compared with prior art has following advantage and beneficial effect: it can make the wetting to greatest extent coil surface of shower water (1), and regularly effective heat transfer area of maximum of the coil pipe tube bank gross area one is provided; (2) tube-surface fluid layer attenuation, this is with enhancing heat transfer; Will form whirlpool when (2) fluid flows through tube surface, produce circulation and mix, increase the Hydrodynamic turbulence degree, this is enhancing heat transfer, thereby improves heat-transfer effect; (3) in pipe, by reducing boundary layer thickness and strengthening mixability and secondary stream, increase Liu worker's speed, heat transfer coefficient is increased, thereby improves heat-transfer effect; (4) eddy current does not need to produce by the device that is attached to pipe, and this point is different with other technology, and Just because of this, they do not need extra assembling, safeguard, check or cleaning; (5) the multidirectional even mixing of formation air-flow reduces gas-flow resistance, keeps higher airflow, promotes evaporation and heat-exchange.

Description of drawings

Fig. 1 is a spiral elliptical tube structural representation;

Fig. 2 is a spiral elliptical tube tube bank arrangement mode.

The specific embodiment

As shown in Figure 1, heat-transfer pipe of the present utility model is the spiral elliptical tube, and pipe is interrupted the distortion spiral, and spiral section 1 is alternately arranged with oval section 2, and oval section 1 length S ₁With spiral section 2 length S ₂Equate; Spiral moment of torsion, i.e. S ₂As required can free adjustment, optimum value is at 200-400mm; Oval segment length's axle is 3: 2 with the ratio of minor axis, helps that study of water film distribution comes off and the passing through of air; Spiral section is identical ellipse with oval section heat-transfer pipe cross section, and continuous vertically alternation is finished a pitch, and promptly the spirals of 360 degree change.

As shown in Figure 2, when spiral elliptical tube of the present utility model was arranged in the single-group pipe bundle, its fillet place need not process, and kept the pipe section, by being welded to connect; Up and down two whens welding pipe, all keep oval segment length's axle, and go up the center line of the oval section of comb under the spiral section center line correspondence of comb at vertical direction; Vertical direction adopts equidistant stringing mode, and the tube pitch L1 of elbow is 1.1-1.8 times of the oval segment length's axle of pipe, and the spacing between two elbows is L2, and L2＞L1.Like this, tube bank is tilted along the flow of refrigerant direction, is beneficial to the discharge of refrigerant liquid.When the single-group pipe bundle was assembled into whole the tube bank, the level interval that tube bank is arranged was 1.4-2.1 times of the oval segment length's axle of pipe, and in the same horizontal tube row, spiral section pipe and oval pipeline section also are alternately to arrange.

The oval coil pipe of interruption distortion spiral of the present utility model, its operation principle and process are as follows: manage outer shower water when being sprayed onto on the spiral elliptical tube, because the special construction of the oval section of spiral, and under the effect of gravity and screw mental and physical efforts, water distributes along the pipe axial flow, the covering tube-surface of maximum area increases effective heat exchange area; Increase the moisture film turbulence simultaneously, the attenuate fluid layer improves the heat transfer outside a tube coefficient.Air enters evaporative condenser from bottom half, when skimming over heat exchange coil, alternately by helix tube and oval pipeline section, has not only increased the air turbulence on level and vertical both direction, makes air-flow along level and vertical multidirectional even mixed distribution; Simultaneously, airflow direction is parallel with oval segment length's axle, its distinctive streamline structure, and the passing through of easier air-flow, under identical less turbulence, its pressure loss reduces, and air velocity is big, can as early as possible heat in the pipe be taken away, and promotes surface evaporation.When tube refrigerant flows along interruption spiral elliptical tube, tube hub fluid ratio tube wall fluid has bigger speed and is subjected to bigger centrifugal force, this will cause secondary stream outside and inside at tube wall at tube hub, and by reducing boundary layer thickness and enhancing mixability, heat transfer coefficient is increased; Simultaneously, pipe bottom smaller volume, the flowing velocity of increase condensate liquid, special cloth tubular construction is more conducive to the discharge of condensate liquid.

Claims

1. one kind is interrupted the oval coil pipe evaporative condenser of spiral, it is characterized in that using the spiral elliptical tube to be heat-transfer pipe.

2. condenser according to claim 1, it is characterized in that described spiral elliptical tube is to be interrupted the distortion spiral, spiral section is alternately arranged with oval section is equidistant, and spiral section is identical ellipse with oval section heat-transfer pipe cross section, and continuous vertically 360 degree spirals change.

3. condenser according to claim 1 is characterized in that the length of each spiral section on the described spiral elliptical tube pipe range direction or oval section, and promptly torque is 200-400mm.

4. condenser according to claim 2 is characterized in that the described oval segment length's axle and the ratio of minor axis are 3: 2.