CN201803631U - Highly-efficient heat exchange tube for electric refrigeration unit condenser - Google Patents

Abstract

The utility model discloses a highly-efficient heat exchange tube for an electric refrigeration unit condenser, which comprises a smooth tube (7), a finned section (9) and a transitional section (8), wherein the transitional section (8) with a spiral fin is connected with the finned section (9). The highly-efficient heat exchange tube is characterized in that the spiral fin (2) spirally expanding along the outer surface of a tube body is arranged outside the tube body (1) of the finned section (9), the outer diameter of the spiral fin (2) is smaller than or equal to that of the smooth tube (7), the top (2B) of the spiral fin (2) is thinner than the root (2A) of the spiral fin (2), smooth surfaces (3) are arranged at the upper ends of two lateral surfaces, the middles of the two lateral surfaces are provided with vertical fins (4) which are axially parallel to the tube and evenly distributed along the circumference of the tube, the upper surfaces of the vertical fins (4) are platforms or inclined surfaces, and the lateral surfaces of the vertical fins (4) are trapezoids. Condensation and heat exchange outside the tube are reinforced, drainage space of condensed fluid is increased, rapid drainage of the condensed fluid and lengthening of condensed fluid membranes are facilitated, turbulent flow in the tube is enhanced, heat exchange in the tube is reinforced, and integral heat exchange efficiency is improved obviously.

Description

A kind of electric refrigerating machine group condenser efficient heat-exchanging pipe

Technical field:

The utility model relates to a kind of electric refrigerating machine group condenser efficient heat-exchanging pipe, relates in particular to the heat exchanger tube of a kind of enforcing condensation heat transfer and convection heat transfer' heat-transfer by convection, belongs to the heat-exchanging part technical field.

Background technology:

In field of Refrigeration and Air-conditioning, the energy consumption of electric refrigerating machine group mainly concentrates on compressor, condenser and the evaporimeter, the efficient of its condenser directly influences the energy consumption of whole system, what the form application of condenser was maximum is shell and tube exchanger, cold-producing medium is the heat convection of cooling water in the out-tubular condensing heat exchange in the pipe.Existing condenser pipe mainly is to be processed into fin by being machined into outer surface, and at fin top gear hobbing groove, forms sharp point by zigzag, promotes flowing of condensate liquid, is passing through space discharge opeing between fin.Because the heat exchanger tube of electric refrigerating machine group condenser is in film condensation, increase with heat flow density, thickness of liquid film increases, and especially tube bank arranges that the condensate liquid on top drops on the lower tube, has seriously increased the delay angle of liquid film, is unfavorable for draining of condensate liquid.The used efficient heat-exchanging pipe of electric refrigerating machine is now used cast, the pipe external thermal resistance is substantially approaching in the pipe, only improves the heat transfer outside a tube performance, in the less heat exchange zone of the temperature difference, raising to complex heat transfer coefficient is limited, needs need improve when improving the heat transfer outside a tube performance heat exchange property in the pipe.

The utility model content:

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art and provides a kind of electric refrigerating machine group condenser that can make obviously to improve with the outer surface and the condensation of refrigerant coefficient of heat transfer of pipe, the intraductal heat exchange performance is promoted significantly, improve the whole heat exchange efficiency of heat exchanger greatly, and at the electric refrigerating machine group condenser efficient heat-exchanging pipe that does not reduce can alleviate under the thick situation of diapire condenser weight.

The purpose of this utility model can reach by following measure: a kind of electric refrigerating machine group condenser efficient heat-exchanging pipe, it comprises plain tube, the fin section, plain tube is provided with helical fin outward by body changeover portion is connected with the fin section, the body that it is characterized in that the fin section is provided with the helical fin that stretches along the outer surface of tube body spiral outward, the external diameter of fin is smaller or equal to the external diameter of plain tube, the top of helical fin is thin than root, the upper end of the two sides of helical fin is a shiny surface, the middle part of the two sides of helical fin is provided with tubular axis and manages the equally distributed straight wing of circumference to parallel edge, the upper surface of straight wing is platform or inclined-plane, and the side of straight wing is trapezoidal.

In order further to realize the purpose of this utility model, the inner surface of tube body of described fin section is provided with the spiral internal tooth, and the normal section of spiral internal tooth is a triangular form or trapezoidal, has groove on the spiral internal tooth.

In order to realize that further the purpose of this utility model, the helical angle of described spiral internal tooth are 30～50 degree, internal tooth head number is 6～60, profile angle 30～90 degree, and interior tooth depth hi is 0.2～0.5mm.

In order further to realize the purpose of this utility model, the helical angle of described groove and spiral internal tooth is 40 to be spent to an angle of 90 degrees, and depth of groove h1 is 1/5～2/3 of the interior tooth depth of spiral, and the normal direction spacing of groove is 0.5～2.0mm.

In order further to realize the purpose of this utility model, the height h of described helical fin is 0.8～1.5mm, the spacing p of fin is 0.3～1.3mm, the thickness t at the top of fin is 0.05～0.3mm, the thickness w of the root of fin is 0.1～0.4mm, and the top of fin is than the thin 0.05～0.2mm of root.

In order further to realize the purpose of this utility model, the intersection of described fin and straight wing is 0.05～0.5mm apart from the distance b of fin top, and the height a of straight wing is 0.3～0.6mm, and width c is 0.2～0.4mm, and the circumferential wing of straight wing is 0.40～1.0mm apart from pe.

The utility model can produce following good effect compared with the prior art: the area of the outer fin of pipe of the present utility model obviously increases, compare with traditional condenser pipe, not that fin top is processed groove, but cut out straight wing from the side, increased the area of fin top, the outer cusp that increases of pipe has been strengthened the performance of condensing heat-exchange, owing to be the straight wing parallel with tubular axis of the increase between fin, the extension liquid ability at edge obviously weakens, and condensate liquid is drained fast along the direction of straight wing.Fin top is thinner than root, the space at top has increased the emission quotas of condensate liquid greater than the root space, and the liquid holdup angle reduces, more help the condensate liquid quick fluid-discharge, the special shape of straight wing has not only increased area, more helps the elongation of condensate film, condensate film attenuate between fin, reduced the condensation thermal resistance, the more traditional condenser pipe of heat exchange property improves more than 10～20%, and the more traditional condenser pipe of external surface area increase improves 10%～20% simultaneously.And the spiral internal tooth is set in the pipe, cut out on the helical tooth with its hand of spiral and be 40 grooves of spending to an angle of 90 degrees, increased the area of inner surface, because the special shape of groove, can strengthen disturbance than dental transition in the simple spiral to tube fluid, reduced the thickness in boundary layer, can be issued to turbulent flow at less flow velocity.The utility model can make electric refrigerating machine group condenser obviously improve with the outer surface and the condensation of refrigerant coefficient of heat transfer of pipe, reinforcement by the band groove inside spin tooth in managing, the intraductal heat exchange performance promotes significantly, improved the whole heat exchange efficiency of heat exchanger, and do not reduced to alleviate condenser weight under the thick situation of diapire.

Description of drawings:

Fig. 1 is an outside schematic diagram of the present utility model;

Fig. 2 is the outer surface and the axle side structure schematic diagram of fin section of the present utility model;

Fig. 3 is the pipe outer spiral fin axial section structural representation of fin section of the present utility model;

Fig. 4 is the outer surface figure of fin section of the present utility model;

Fig. 5 is the axial section of the interior helical tooth of the pipe of fin section of the present utility model.

The specific embodiment: the specific embodiment of the present utility model is elaborated below in conjunction with accompanying drawing:

Embodiment: a kind of electric refrigerating machine group condenser with efficient heat-exchanging pipe (referring to Fig. 1-Fig. 5), it comprises plain tube 7, fin section 9, plain tube 7 is provided with helical fin outward by body changeover portion 8 is connected with fin section 9, the body 1 outer helical fin 2 that is certain helical angle and stretches with the tube hub axis that is provided with of fin section 9 along the outer surface of tube body spiral, the external diameter of the fin 2 of fin section 9 is smaller or equal to the external diameter of plain tube 7, the top 2B of helical fin 2 is thin than root 2A, the upper end of the two sides of helical fin 2 is a shiny surface 3, the middle part of the two sides of helical fin 2 is provided with tubular axis and manages the equally distributed straight wing 4 of circumference to parallel edge, the upper surface of straight wing 4 is platform or inclined-plane, and the side of straight wing 4 is trapezoidal.The scope of the height h of helical fin 2 is 0.8～1.5mm, the spacing p of fin 2 is 0.3～1.3mm, the thickness t of the top 2B of fin 2 is 0.05～0.3mm, and the thickness w of the root 2A of fin 2 is 0.1～0.4mm, and the top 2B of fin 2 is than the thin 0.05～0.2mm of root 2A.The intersection of straight wing 4 and fin 2 is 0.05～0.5mm apart from the distance b at fin 2 tops, and the height a of straight wing 4 is 0.3～0.6mm, and width c is 0.2～0.4mm, and the circumferential wing of straight wing is 0.40～1.0mm apart from pe.

The utility model is the heat exchange in the enhanced tube, increase flow-disturbing, reduce the thickness in heat convection boundary layer, body 1 inner surface of fin section 9 is provided with spiral internal tooth 5, helical angle is 30～50 degree, internal tooth head number is 6～60, the normal section of internal tooth is a triangular form or trapezoidal, profile angle 30～90 degree, interior tooth depth hi is 0.2～0.5mm, cut on the spiral internal tooth 5 with its helical angle and be 40 grooves 6 of spending to an angle of 90 degrees, depth of groove h1 be in the spiral tooth depth 1/5～2/3, the normal direction spacing of groove 6 is 0.5～2.0mm.

The utility model is once moulding on plain tube, process inside spin tooth 5 that has groove 6 and the helical fin 1 that is certain helical angle and stretches with the tube hub axis along the outer surface of tube body spiral, do not have thermal contact resistance between fin section and the body, plain tube 7 is connected by changeover portion 8 with fin section 9.

Claims (6)

1. electric refrigerating machine group condenser efficient heat-exchanging pipe, it comprises plain tube (7), fin section (9), plain tube (7) is provided with helical fin outward by body changeover portion (8) is connected with fin section (9), the outer helical fin (2) that stretches along the outer surface of tube body spiral that is provided with of body (1) that it is characterized in that fin section (9), the external diameter of fin (2) is smaller or equal to the external diameter of plain tube (7), the top (2B) of helical fin (2) is thin than root (2A), the upper end of the two sides of helical fin (2) is shiny surface (3), the middle part of the two sides of helical fin (2) is provided with tubular axis and manages the equally distributed straight wing of circumference (4) to parallel edge, the upper surface of straight wing (4) is platform or inclined-plane, and the side of straight wing (4) is trapezoidal.

2. a kind of electric refrigerating machine group condenser efficient heat-exchanging pipe according to claim 1, body (1) inner surface that it is characterized in that described fin section (9) is provided with spiral internal tooth (5), the normal section of spiral internal tooth (5) is a triangular form or trapezoidal, has groove (6) on the spiral internal tooth (5).

3. a kind of electric refrigerating machine group condenser efficient heat-exchanging pipe according to claim 2, the helical angle that it is characterized in that described spiral internal tooth (5) they are 30～50 degree, and internal tooth head number is 6～60, profile angle 30～90 degree, and interior tooth depth hi is 0.2～0.5mm.

4. according to claim 2 or 3 described a kind of electric refrigerating machine group condenser efficient heat-exchanging pipes, the helical angle that it is characterized in that described groove (6) and spiral internal tooth (5) is 40 and spends to an angle of 90 degrees, depth of groove h1 is 1/5～2/3 of the interior tooth depth of spiral, and the normal direction spacing of groove (6) is 0.5～2.0mm.

5. a kind of electric refrigerating machine group condenser efficient heat-exchanging pipe according to claim 1, the height h that it is characterized in that described helical fin (2) is 0.8～1.5mm, the spacing p of fin (2) is 0.3～1.3mm, the thickness t at the top (2B) of fin (2) is 0.05～0.3mm, the thickness w of the root (2A) of fin (2) is 0.1～0.4mm, and the top (2B) of fin (2) is than the thin 0.05～0.2mm of root (2A).

6. a kind of according to claim 1 or 5 electric refrigerating machine group condenser efficient heat-exchanging pipe, the intersection that it is characterized in that described fin (2) and straight wing (4) is 0.05～0.5mm apart from the distance b at fin (2) top, the height a of straight wing (4) is 0.3～0.6mm, width c is 0.2～0.4mm, and the circumferential wing of straight wing is 0.40～1.0mm apart from pe.

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