CN202153112U

CN202153112U - Falling film evaporating heat exchange tube with fins formed by wire mesh

Info

Publication number: CN202153112U
Application number: CN201120197051XU
Authority: CN
Inventors: 林格玮; 苏春龙; 陈焕倬
Original assignee: SUZHOU XINTAITONG EFFICIENT TUBE CO Ltd
Current assignee: SUZHOU XINTAITONG EFFICIENT TUBE CO Ltd
Priority date: 2011-06-13
Filing date: 2011-06-13
Publication date: 2012-02-29
Anticipated expiration: 2021-06-13

Abstract

The utility model discloses a falling film evaporating heat exchange tube with fins formed by a wire mesh. The falling film evaporating heat exchange tube comprises a heat exchange tube body, a metal wire mesh layer, and round fins formed by the metal wire mesh; the metal wire mesh layer is covered on the outer surface of the heat exchange pipe body, and wire mesh-shaped round fins protruding outwards are arranged on the metal wire mesh. The utility model adopts the metal wire mesh layer and the wire mesh-shaped fins, so that the radiation area is enlarged, the phenomenon that fins with no meshes block the axial flow of liquid is eliminated, the defect that partial outer surface of a conventional heat pipe dries easily is overcome, and the liquid on the outer surface of the heat exchange pipe bear capillary force more uniformly, thereby improving the coefficient of the heat exchange of the evaporating heat exchange tube, and further advancing the work efficiency of the evaporating heat exchange tube.

Description

A kind ofly have a falling film evaporation heat exchanger tube that silk screen is processed fin

Technical field

The utility model relates to a kind of evaporating heat-exchanging pipe, specifically designs a kind of falling film type evaporation pipe that improves the inside and outside fluid thermal switching performance of pipe.

Background technology

Falling film evaporator is the visual plant in many industrial processes, for example, and the falling film evaporator in the central air conditioner system handpiece Water Chilling Units.The quality of falling film evaporator performance depends on the exchange performance quality to a great extent.

Tradition heat exchanger tube (as shown in Figure 1) is for having the body 13 of inner chamber, and inboard wall of tube body smooth surface or inner wall surface are axially arranged with the conduit 11 of shape distribution in the shape of a spiral along body usually; The tube wall surface is for smooth surface or have the fin 12 that distributes along the axial shape in the shape of a spiral of body, and fin and body are the integral entity structure.

The tradition heat exchanger tube is in the process of heat exchange; The outer liquid of heat exchanger tube sprays on the heat exchanger tube from the heat exchanger tube top; Form thin liquid film at heat exchange pipe external surface, hot fluid flows through in heat exchanger tube, carries out heat exchange with the outer liquid of pipe when flowing; After managing outer heated liquid evaporation and boiling and generation steam taking place, takes away the heat of tube fluid.Many heat exchanger tubes are arranged in horizontal tube bundle in evaporimeter; The spray partially liq in tube bank on row pipe be evaporated into steam; Have little time evaporated liquid and flow downwards, continue evaporation and take away a part of heat, go down so successively through arranging the heat-transfer pipe outer surface in the tube bank down; Total some liquid continues to flow downward under the gravity effect, one row's heat exchanger tube up to the bottom of tube bank.

There is following problem in above-mentioned evaporimeter: the outer moistening diffusivity of liquid of falling film evaporation pipe pipe is abundant inadequately, and in the evaporimeter of horizontal arrangement, liquid sprays from the top of heat exchanger tube tube bank; Before axial moistening diffusion along heat exchanger tube; Easily below circumferentially the falling of heat exchanger tube on a row the heat exchanger tube, the liquid that drops onto next row's heat exchanger tube can continue along pipe axially again to next row's heat exchanger tube drippage before moistening diffusion vertically not; In the middle of pipe row, form the nowed forming of fluid column shape easily; Cause liquid inhomogeneous in the heat exchanger tube surface distributed, the surface liquid liquid film thickening that the heat exchanger tube part is contacted with fluid column has reduced the heat exchange effect; And drying up appears in the part heat exchange surface between the fluid column, can not carry out heat exchange.Evidence, can the liquid of Heat Transfer in Evaporating Falling Film tube-surface be evenly distributed, very big to the heat exchange influential effect of heat-transfer pipe, becomes the key that improves film droping heat-transfer pipe heat exchange effect.

The utility model content

The utility model purpose: the purpose of the utility model is in order to solve the deficiency of prior art, provides that a kind of can to overcome heat exchange pipe external surface dry, makes liquid on heat exchanger tube, be more evenly distributed, and heat exchange is the falling film type evaporation pipe more fully.

Technical scheme: in order to realize above purpose, the described a kind of falling film evaporation heat exchanger tube that silk screen is processed circular fin that has of the utility model, it comprises: outwards outstanding circular fin on heat exchanger tube body, oven wire mesh blanket and the oven wire mesh blanket; This fin is made up of woven wire; Said oven wire mesh blanket and helical fin are covered in the outer surface of heat exchanger tube body.

Oven wire mesh blanket that covers on the heat exchange tube external surface in the utility model and the circular fin processed by woven wire can be through the processing method manufacturings of sintering and pressure welding, make oven wire mesh blanket and circular fin tightly combine to be integrally formed with heat exchanger tube is surperficial.Said oven wire mesh blanket of the utility model and circular fin are made up of the multi-layer silk screen of 0.05～0.5mm thickness, and silk screen order silk is 20～400 orders.

The top of circular fin described in the utility model is the rectangle or the trapezoidal or triangle of circular arc.The height of said circular fin is 0.5～2mm, and the number of fin is 10～500 slices/meter.

The inside pipe wall face of the said heat exchanger tube body of the utility model is provided with spiral helicine conduit, and this number of channels is 10～80, and the degree of depth is 0.1～0.4mm.Said heat exchange tube internal face also can be smooth surface.

The operation principle of the utility model is following: the liquid under spraying from falling film evaporation heat exchanger tube top is before circumferentially dripping downwards along the heat exchanger tube body, and partially liq can flow through from oven wire mesh blanket and the circular fin of mesh-like vertically; According to Hydrodynamics Theory, liquid flows in the porous media of oven wire mesh blanket and the circular fin formation of mesh-like, except receiving the gravity effect; Also receive capillary effect; In oven wire mesh blanket and the circular fin of mesh-like, liquid flows to the low place of saturation degree from the high place of hold-up degree under the effect of capillary force, promptly flows to the few place of liquid from the many places of liquid; Liquid is evenly distributed on the falling film evaporation heat exchanger tube, has improved the coefficient of heat transfer of evaporating heat-exchanging pipe.

Beneficial effect

The utility model is said to have falling film evaporation heat exchanger tube and the prior art that silk screen is processed fin, compares to have the following advantages:

(1) owing to the circular fin of mesh-like is made up of woven wire; When heat exchange tube surface localized liquid is too much; The circular fin of mesh-like has played the effect that absorbs liquid, makes the liquid distribution of heat exchange tube surface even, and the circular fin of mesh-like has played the effect of " remittance "; In case local surface occurs dry, the liquid that the circular fin of mesh-like absorbs will the few part of heat exchanging tube-surface liquid replenish under the capillary force effect, and the circular fin of mesh-like this moment has played the effect in " source "; Be prone to dry shortcoming thereby overcome heat exchange pipe external surface, make liquid on the falling film evaporation heat exchanger tube, be evenly distributed, improved heat exchange property;

(2) because the porosity of the circular fin of mesh-like reaches more than 40%, and when fluid flow was big, liquid can directly pass the circular fin of mesh-like and flow vertically, the fin that has overcome no mesh hinders the shortcoming of liquid axial flow; Guaranteed that from another point of view liquid is more evenly distributed at the falling film evaporation heat exchange pipe external surface, has further improved heat exchange property;

(3) because the circular fin of oven wire mesh blanket and mesh-like has increased the volume and the surface area of the said heat exchanger tube of the utility model; Thereby increased heat exchange area; Strengthen the heat exchange between the hot fluid in external liquid of heat exchange tube and the pipe, improved the heat exchange effect once more;

(4) because the circular fin of oven wire mesh blanket and mesh-like is a loose structure, help producing more gasification core, further strengthened the boiling heat transfer effect;

(5) because the heat exchange tube body internal face is provided with helical groove, when fluid flow through, the spiral slot road had destroyed near the boundary layer of the liquid of wall, had improved the coefficient of heat transfer of tube fluid, had strengthened the effect of tube fluid heat exchange.

Description of drawings

Fig. 1 is the structural pipe wall sketch map of traditional fin heat transfer pipe.

Fig. 2 is the structural pipe wall sketch map of heat-transfer pipe in the utility model.

Fig. 3 is heat-transfer pipe outward appearance and a two ends light section sketch map in the utility model.

The specific embodiment:

Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the utility model; Should understand these embodiment only be used to the utility model is described and be not used in the restriction the utility model scope; After having read the utility model, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the utility model.

Embodiment

A kind of falling film evaporation heat exchanger tube that silk screen is processed circular fin that has as shown in Figure 3; Its two ends are light section 31; Can combine closely and be fixed together with the end plate of heat exchanger tube, hot fluid flows through in the falling film evaporation heat exchange tube that the silk screen fin is arranged, and the liquid outer with pipe carries out heat exchange.

As shown in Figure 2 this has the evaporating heat-exchanging pipe of silk screen fin to comprise: heat exchanger tube body 24 and oven wire mesh blanket 22; Said oven wire mesh blanket 22 is covered in heat exchanger tube body 24 outer surfaces; Oven wire mesh blanket 22 is provided with outwards outstanding circular fin 21, and this circle fin 21 is made up of the silk screen of porous; The top is that the rectangle height of circular arc is 2mm, 300 slices/meter of fin numbers.Said heat exchanger tube body 24 inside pipe wall faces are provided with spiral helicine conduit 23, and these conduit 23 numbers are 40, and the degree of depth is 0.4mm.

Oven wire mesh blanket described in the present embodiment 22 is made up of the multi-layer silk screen of 0.5mm thickness, and silk screen order silk is 200 orders, and silk screen fin order silk is similarly 200 orders.

Claims

1. one kind has the falling film evaporation heat exchanger tube that silk screen is processed fin, and it is characterized in that: it comprises: heat exchanger tube body (24), oven wire mesh blanket (22) and oven wire mesh blanket (22) are gone up outwards outstanding circular fin (21); This circle fin (21) is made up of woven wire; Said oven wire mesh blanket (22) and circular fin (21) are covered in the outer surface of heat exchanger tube body (24).

2. a kind of falling film evaporation heat exchanger tube that silk screen is processed fin that has according to claim 1, it is characterized in that: the top of circular fin (21) is rectangle or trapezoidal or triangle.

3. a kind of falling film evaporation heat exchanger tube that silk screen is processed fin that has according to claim 1 is characterized in that: it highly is 0.5～2mm for the said circular fin (21) that is made up of woven wire, and number is 10～500 slices/meter.

4. a kind of falling film evaporation heat exchanger tube that silk screen is processed fin that has according to claim 1; It is characterized in that: said heat exchanger tube body (24) inside pipe wall face is provided with spiral helicine conduit (23); The number of this conduit (23) is 10～80, and the degree of depth is 0.1～0.4mm.

5. a kind of falling film evaporation heat exchanger tube that silk screen is processed fin that has according to claim 1, it is characterized in that: said heat exchanger tube body (24) inside pipe wall face is a smooth surface.

6. according to the described a kind of falling film evaporation heat exchanger tube that silk screen is processed fin that has of arbitrary claim among the claim 1-5; It is characterized in that: said oven wire mesh blanket (22) and circular fin (21) are made up of the multiple layer metal silk screen of 0.05～0.5mm thickness, and the wire net mesh silk is 20～400 orders.