CN211147419U - Finned tube of air-cooling condenser - Google Patents

Abstract

The utility model relates to an air cooling condenser finned tube belongs to air cooling condenser technical field. The base pipe comprises a base pipe (1) and a snake-shaped fin (2), wherein the cross section of the base pipe (1) is a flat special pipe, and two side surfaces of the long side of the cross section of the base pipe (1) are respectively provided with at least one inner groove; the inner grooves are parallel to the central axis of the base pipe (1) and are symmetrical to the long axis of the cross section, the length of each inner groove is approximately equal to that of the base pipe (1), the inner grooves at the corresponding positions on the two side surfaces form a pair, and each pair of inner grooves form a narrow gap on the inner wall of the base pipe (1); each pair of inner grooves divides the inner cavity of the base pipe (1) into two smaller inner cavities communicated by a narrow gap; the outer parts of two side faces of the base pipe (1) with long sides of the cross section are respectively provided with at least one snake-shaped fin (2). The utility model discloses an air cooling condenser finned tube can increase parent tube rigidity, reduce material cost, can improve heat exchange efficiency again.

Description

Finned tube of air-cooling condenser

Technical Field

The utility model relates to an air cooling condenser finned tube belongs to air cooling condenser technical field.

Background

The function of the air-cooled condenser is to condense the exhaust steam from the steam turbine or steam turbine into water for use in the boiler to form the cycle.

The heat exchange elements used by the air-cooled condenser are finned tubes for strengthening heat exchange outside the tubes, and most commonly are single-row tubes. The single-row tube consists of a base tube and fins welded outside the tube, the base tube is a rectangular flat tube, the fins are serpentine fins, and the fins in the tube bundle of the air-cooling condenser are arranged in a single row. The single-row pipe has the advantages that the anti-freezing performance is good when the single-row pipe is used in cold regions in winter, the pressure difference in the pipes caused by inconsistent heat loads of the upper and lower heat exchange pipes of the multi-row pipe is avoided, and the phenomena of non-condensable gas accumulation and condensed water freezing are reduced.

However, the long edge of the finned tube (single-row tube) is large in size, the tube is in a negative pressure state during working, and the rigidity of the long edge of the finned tube is low, so that the tube is easy to deform under the action of external pressure, and the snakelike fin outside the base tube not only has a heat exchange strengthening function, but also bears the external pressure of the finned tube, and has the function of reducing the deformation of the pressed base tube.

The single-row tube has poor rigidity of the base tube, the base tube depends on the characteristic that the fins bear pressure, the thickness of the fins is limited, the material cost of the finned tube is high, the design of the fins is restrained, technical means such as slotting and heat exchange strengthening cannot be applied, and the heat exchange efficiency of the finned tube is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem of proposing in the above-mentioned background problem, provide an air cooling condenser finned tube, it can increase parent tube rigidity, reduce material cost, can improve heat exchange efficiency again.

The purpose of the utility model is realized like this: an air-cooled condenser finned tube comprises a base tube and a serpentine fin, wherein the cross section of the base tube is a flat special-shaped tube, and two side surfaces of the long side of the cross section of the base tube are respectively provided with at least one inner groove;

the inner grooves are parallel to the central axis of the base pipe and are symmetrical to the long axis of the cross section, a pair of inner grooves at corresponding positions on two side surfaces is formed, and each pair of inner grooves form a narrow gap on the inner wall of the base pipe;

each pair of inner grooves divides the inner cavity of the base tube into two smaller inner cavities which are communicated by a narrow gap;

and at least one snake-shaped fin is arranged outside each of the two side faces where the long side of the cross section of the base tube is located.

The serpentine fins are not broken at the inner grooves and are continuous and integrated.

The serpentine fins are broken at the inner grooves to form two serpentine fins.

The serpentine fins are also provided with a plurality of strip seams which are vertical to the air flowing direction and used for strengthening heat exchange.

The size of a narrow gap formed by each pair of inner grooves on the inner wall of the base pipe is not less than 0mm and not more than 5 mm.

The cross section of the base pipe has the external dimension of 120-220mm in length and 12-20mm in width, and the wall thickness of the base pipe is 0.8-1.5 mm.

The serpentine fin is made of aluminum or aluminum alloy, and the thickness of the serpentine fin is 0.1-0.25 mm.

The base pipe is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.

The connection method of the serpentine fin and the base pipe is a brazing method.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses an air cooling condenser finned tube has increased basic tube rigidity, and the stress that the fin bore the external pressure reduces greatly, and the fin can implement attenuate thickness reduce cost, crack measures such as optimizing heat transfer performance to also make air cooling condenser's cost reduction, performance improvement.

Drawings

Fig. 1 is a cross-sectional view of a finned tube according to example 1 of the present invention.

Figure 2 is a cross-sectional view of a substrate tube according to example 1 of the present invention.

FIG. 3 is an overall schematic view of a finned tube according to embodiment 1 of the present invention.

Fig. 4 is a top view of the fin in embodiment 1 of the present invention.

Fig. 5 is a side view of a fin according to embodiment 1 of the present invention.

Fig. 6 is a cross-sectional view of a finned tube according to example 2 of the present invention.

Fig. 7 is a cross-sectional view of a finned tube according to example 3 of the present invention.

Figure 8 is a cross-sectional view of a substrate tube according to example 3 of the present invention.

Figure 9 is a cross-sectional view of a finned tube of example 4 of the present invention.

In the figure: 1. a base pipe; 2. a serpentine fin.

Detailed Description

The invention is described below with reference to the accompanying drawings and specific embodiments:

example 1:

an air-cooling condenser finned tube as shown in fig. 1-5, wherein fig. 1 is a cross-sectional view of the finned tube of example 1, and the air-cooling condenser finned tube comprises a base tube 1 and a serpentine fin 2.

Fig. 2 is a cross-sectional view of a base pipe 1 of embodiment 1, the base pipe 1 is a special pipe similar to a flat shape, two side faces of a long side of a cross section of the base pipe 1 are respectively provided with an inner groove, the inner grooves are parallel to a central axis of the base pipe 1 and symmetrical to the long axis of the cross section, the inner grooves on the two side faces are both positioned in the middle of the base pipe 1 (in the height direction), the inner grooves on the two side faces form a pair, and a narrow gap is formed in the inner wall of the base pipe 1, the size of the gap is not less than 0mm, but is; each pair of inner grooves divides the inner cavity of the base pipe 1 into two smaller inner cavities which are communicated by a narrow gap.

External dimensions of the base pipe 1: the length (height direction) is 120-220mm, the width is 12-20mm, and the wall thickness of the material plate is 0.8-1.5 mm. The length of the inner groove is equal to (or approximately equal to) the length of the base pipe 1.

The base pipe 1 is made of a bimetal composite material, the outer side of the base pipe comprises but is not limited to aluminum or aluminum alloy, and the inner layer of the base pipe comprises but is not limited to carbon steel or stainless steel.

FIG. 3 is a schematic view of the finned tube of embodiment 1, with serpentine fins 2 disposed on both sides of a base tube 1, and the serpentine fins 2 are connected to the base tube 1 by brazing.

Fig. 4 is a top view of the serpentine fin 2 in embodiment 1, the serpentine fin 2 is formed by bending a plurality of serpentine fins, and the serpentine fin 2 is provided with a plurality of slits for reinforcing heat exchange, and the number and size of the slits may be optimally designed according to the use conditions;

wherein FIG. 5 is a front view of the serpentine fin 2 of example 1, showing the location and distribution of the slits, the direction of the slits being perpendicular to the direction of air flow (air flow direction from bottom to top); the serpentine fin 2 can be made of aluminum or aluminum alloy with good heat conductivity, and the thickness of the material is 0.1-0.25 mm.

In this embodiment, after the two side surfaces of the base tube 1 are provided with the inner grooves, the rigidity of the base tube 1 and the finned tubes is enhanced, and the stress of the serpentine fins 2 is reduced.

When the base pipe 1 works, the base pipe 1 deforms under the external pressure, narrow gaps in the base pipe 1 at the inner groove can be reduced until the inner walls are contacted, and pipe walls of the left side surface and the right side surface are mutually supported after the inner grooves are contacted, so that the base pipe 1 is prevented from further deforming;

therefore, the stress and deformation of the serpentine fin 2 can be controlled by designing the gap at the inner groove, so that the influence of the compression deformation of the base tube 1 on the design optimization of the serpentine fin 2 is greatly reduced, and the technical means of material cost reduction (thinning), performance optimization (slotting) and the like can be applied to the serpentine fin 2.

In the embodiment, two small cavities formed by the inner grooves are not completely isolated, the upper cavity and the lower cavity are communicated by a narrow gap, so that a larger temperature difference (or pressure difference) between the two cavities can not occur like a plurality of rows of pipes, and the original antifreezing advantage of a single row of pipes is kept;

in the embodiment, the serpentine fins 2 on each side of the base tube 1 are one continuous and integrated piece, and for two small cavities formed by the inner grooves, the continuous and integrated serpentine fins 2 can also balance the temperature difference of the two small cavities. Thus, example 1 is well suited for use in northern and domestic areas where winter freeze protection is required.

Example 2:

as shown in fig. 6, an air-cooled condenser finned tube of example 2.

Different from the embodiment 1, in the embodiment, the serpentine fins 2 are disconnected at the inner grooves of the base tube 1, and the fins on the left and right sides of the base tube are not continuous at the inner grooves when viewed from the cross section, which is equivalent to cutting the serpentine fins 2 of the embodiment 1 at the inner grooves into two, so that each side surface of the base tube 1 forms two serpentine fins 2; the other technical means are the same as those of the embodiment 1.

Therefore, the serpentine fin 2 in the present embodiment is less affected by the deformation of the base pipe 1 than in embodiment 1.

Example 3:

an air-cooled condenser finned tube according to example 3 is shown in FIGS. 7 to 8.

Wherein, fig. 7 is a cross section view of a finned tube of the utility model discloses embodiment 3, an air cooling condenser finned tube, including a base tube 1 and a serpentine fin 2, the serpentine fin 2 is respectively arranged on both sides of the base tube 1; the serpentine fins 2 on each side of example 3 are continuous and integral (not broken at the inner grooves) as viewed from the finned tube cross section.

Wherein figure 8 is the utility model discloses embodiment 3's parent tube cross section picture, in this embodiment, parent tube 1 left and right sides face respectively has two inner groovies, divides into 3 locules to parent tube 1's inner chamber.

In this embodiment, the other structural forms and characteristics are the same as those of embodiment 1 except that the base pipe 1 is different.

Example 4:

as shown in fig. 9, an air-cooled condenser finned tube of example 4.

Wherein figure 9 is the finned tube cross section of the utility model discloses embodiment 4, in this embodiment, snakelike fin 2 is discontinuous in the inner groovy, and every side of base tube 1 sets up two inner groovies, and snakelike fin 2 of every side is divided into the triplex, forms three snakelike fins 2 of every side.

The embodiment 4 is the same as the embodiment 3 except that each side of the serpentine fin 2 is divided into 3 pieces.

The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims (9)

1. The utility model provides an air cooling condenser finned tube, includes parent tube (1) and snakelike fin (2), its characterized in that: the cross section of the base pipe (1) is a flat special pipe, and two side surfaces of the base pipe (1) where long sides of the cross section are located are respectively provided with at least one inner groove;

the inner grooves are parallel to the central axis of the base pipe (1) and are symmetrical to the long axis of the cross section, a pair of inner grooves at corresponding positions on two side surfaces is formed, and each pair of inner grooves form a narrow gap on the inner wall of the base pipe (1);

each pair of inner grooves divides the inner cavity of the base pipe (1) into two smaller inner cavities communicated by a narrow gap;

the outer parts of two side faces of the base pipe (1) with long sides of the cross section are respectively provided with at least one snake-shaped fin (2).

2. The air-cooling condenser finned tube of claim 1, wherein: the serpentine fins (2) are not broken at the inner grooves and are continuously integrated.

3. The air-cooling condenser finned tube of claim 1, wherein: the serpentine fins (2) are broken at the inner grooves to form two serpentine fins.

4. An air-cooling condenser finned tube according to claim 1, 2 or 3 wherein: the serpentine fin (2) is also provided with a plurality of strip slits which are vertical to the air flowing direction and used for strengthening heat exchange.

5. The air-cooling condenser finned tube of claim 1, wherein: the size of a narrow gap formed by each pair of inner grooves on the inner wall of the base pipe is not less than 0mm and not more than 5 mm.

6. The air-cooling condenser finned tube of claim 1, wherein: the cross section of the base pipe (1) has the external dimension of length of 120 mm and width of 12-20mm, and the wall thickness of the base pipe is 0.8-1.5 mm.

7. The air-cooling condenser finned tube of claim 4, wherein: the serpentine fin (2) is made of aluminum or alloy aluminum, and the thickness of the material is 0.1-0.25 mm.

8. The air-cooling condenser finned tube of claim 6, wherein: the base pipe (1) is made of a bimetal composite material, the outer layer is made of aluminum or alloy aluminum, and the inner layer is made of carbon steel or stainless steel.

9. The air-cooling condenser finned tube of claim 1, wherein: the connection method of the snake-shaped fin (2) and the base pipe (1) is a brazing method.

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