CN201676814U

CN201676814U - Semicircular variable-section air delivery duct of oven for automobile bodies

Info

Publication number: CN201676814U
Application number: CN2010201889246U
Authority: CN
Inventors: 叶永伟; 蒋建东; 陈建; 刘志浩; 江叶峰; 林海; 陈贵
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2010-05-13
Filing date: 2010-05-13
Publication date: 2010-12-22
Anticipated expiration: 2020-05-13

Abstract

A semicircular variable-section air delivery duct of an oven for automobile bodies is characterized in that side holes are uniformly distributed on the side of the air delivery duct, the air delivery duct consists of a plurality of pipe sections, the cross section of each pipe section is semicircular, and diameters of the sections of the pipe section are reduced gradually. The semicircular variable-section air delivery has the advantages of having fine air delivery uniformity and avoiding backflow of fresh air.

Description

Semicircle and variable-section air duct of drying room of automotive body

Technical field

The utility model relates to a kind of body of a motor car drying room variable cross-section air delivery duct.

Background technology

In the body of a motor car paint line, drying room occupies an important position.Surface of the work is coated behind the coating, needs the baking and curing through drying room, could form firm coating attractive in appearance.High performance coating is temperature, the time requirement strictness to solidifying not only, and is that temperature homogeneity in the drying room workspace also has very high requirement to the internal environment of drying room equipment.Have only superior drying environment and condition that dries quantity is guaranteed fully.What therefore, how better to guarantee temperature in the drying room evenly becomes primary problem.

On the structure of body of a motor car drying room air delivery duct, generally adopt the uiform section rectangular duct, though the uiform section rectangular duct has the energy conserve space, the simple and low cost and other advantages of manufacturing process; But when air-flow was mobile from air channel head end side opening terminad side opening, its direction gradually changed, and similar at last and axis normal can't guarantee balanced ventilation and guarantee the even of the interior temperature of drying room.

In traditional body of a motor car drying room air delivery duct, owing to have enough spaces and pressure distribution everywhere inhomogeneous at the first half of drying room, thus cause the new wind of part directly to flow away from return air inlet, do not play any effect to drying vehicle body; On the other hand, owing to adopt the uiform section air channel, more near the air channel end, wind speed is low more, thereby causes the short circuit of new wind.

Summary of the invention

Can't realize that in order to overcome traditional uiform section rectangular duct balanced ventilation, new wind produce backflow phenomenon at the place, air port, the static pressure that the utility model proposes the balanced ventilation of a kind of energy, whole air channel keeps constant semicircle and variable-section air duct of drying room of automotive body.

The technical solution of the utility model:

Semicircle and variable-section air duct of drying room of automotive body is evenly equipped with side opening on the side in described air channel, it is characterized in that: described air channel is made up of the plurality of sections pipeline section, and the cross section of described pipeline section is semicircle, and the section radius of described pipeline section reduces successively.

Further, the equal in length of described pipeline section.

The sectional dimension computing formula of pipeline section described in the utility model is as follows:

\{\begin{matrix} A_{1} = \frac{(1 - \frac{n_{i}}{n}) \cdot L}{3600 \cdot v_{1}}, \\ A_{i + 1} = \frac{(1 - \frac{n_{i}}{n}) \cdotL}{3600 \cdot 1.29 \sqrt{\frac{v_{i}^{2} \cdot ρ}{2} - Σ_{k = 1}^{i + 1} l \cdot ζ \cdot {(\frac{2 \sqrt{2 π A_{i}}}{2 + π})}^{- 1.21} \cdot v_{i}^{1.925}}} \end{matrix} - - - (1)

A is the area in the total air port of air intake, and L is a total blast volume, and then initial velocity is

N is that n is counted in the air port _iRepresent this cross section air port number before, to normal air, ρ=1.204kg/m ³, ζ=1.05 * 10 ^-2, i=1.2.3...n, l represents draught interval,

The friction loss of expression from the 1st cross section to i+1 each section of section and;

When draught interval is determined, can calculate each section area of section according to formula (1), thereby can get the radius size of semicircle variable cross-section.

Static pressure in the uiform section air channel has originally caused the minimizing of dynamic pressure along with the air channel slowly increases along end, makes that the terminal wind speed that arrives the air channel more is more little, has formed the phenomenon of uneven air.And taked variable cross-section, and can guarantee that static pressure is invariable, realize balanced ventilation; Adopt each the air port static pressure behind the variable cross-section to tend towards stability simultaneously, make new wind short circuit phenomenon obtain effective improvement.It is little that air channel structure adopts the air port wind speed after variable cross-section is optimized to change than original air port, uiform section air channel wind speed, and tuyere velocity is more even.

The relative half elliptic variable cross-section of semicircle variable cross-section of the present utility model, the rectangle variable cross-section, at the air inlet place (less than 10 air ports), the equivalent diameter of semicircle variable cross-section of the present utility model is greater than the half elliptic variable cross-section, the equivalent diameter of rectangle variable cross-section, make friction loss on the unit length air channel of semicircle variable cross-section of the present utility model less than the half elliptic variable cross-section, friction loss on the unit length air channel of rectangle variable cross-section, the speed at place, feasible most of semicircle variable cross-section of the present utility model air port is less than the half elliptic variable cross-section, the speed at the place, air port of rectangle variable cross-section, and when air inlet is far away (greater than 10 air ports), the equivalent diameter of semicircle variable cross-section of the present utility model is less than the equivalent diameter of half elliptic variable cross-section, and the speed that has caused place, last semicircle variable cross-section of the present utility model air port is greater than the half elliptic variable cross-section, the speed at the place, air port of rectangle variable cross-section.

And each air port wind speed uniformity coefficient excursion of semicircle variable cross-section of the present utility model, the air-supply uniformity coefficient standard deviation than half elliptic variable cross-section, rectangle variable cross-section minimum.

The beneficial effects of the utility model: have good air-supply uniformity, avoided new wind backflow phenomenon.

Description of drawings

Fig. 1 is a structural front view of the present utility model.

Fig. 2 is a vertical view of the present utility model.

Fig. 3 is the schematic cross-section of pipeline section of the present utility model.

Fig. 4 is the static pressure comparison diagram in uiform section and variable cross-section air channel.

Fig. 5 is the cross section speed comparison diagram in uiform section and variable cross-section air channel.

Fig. 6 is the equivalent diameter comparison diagram in three kinds of variable cross-section air channels.

Fig. 7 is the coefficient of uniformity comparison diagrams of three kinds of variable cross-section air channels to tuyere velocity.

The specific embodiment

With reference to Fig. 1-3, semicircle and variable-section air duct of drying room of automotive body is evenly equipped with side opening 2 on the side in described air channel, and described air channel is made up of plurality of sections pipeline section 1, and the cross section of described pipeline section 1 is semicircle, and the section radius of described pipeline section 1 reduces successively.

The equal in length of described pipeline section 1.

The sectional dimension computing formula of described pipeline section 1 is as follows:

\{\begin{matrix} A_{1} = \frac{(1 - \frac{n_{i}}{n}) \cdot L}{3600 \cdot v_{1}}, \\ A_{i + 1} = \frac{(1 - \frac{n_{i}}{n}) \cdotL}{3600 \cdot 1.29 \sqrt{\frac{v_{i}^{2} \cdot ρ}{2} - Σ_{k = 1}^{i + 1} l \cdot ζ \cdot {(\frac{2 \sqrt{2 π A_{i}}}{2 + π})}^{- 1.21} \cdot v_{i}^{1.925}}} \end{matrix} - - - (1)

A is the area in the total air port of air intake, and L is a total blast volume, and then initial velocity is N is that n is counted in the air port _iRepresent this cross section air port number before, to normal air, ρ=1.204kg/m ³, ζ=1.05 * 10 ^-2, i=1.2.3...n, l represents draught interval, The friction loss of expression from the 1st cross section to i+1 each section of section and;

With reference to Fig. 4, Fig. 5, the static pressure in the uiform section air channel has originally caused the minimizing of dynamic pressure along with the air channel slowly increases along end, makes that the terminal wind speed that arrives the air channel more is more little, has formed the phenomenon of uneven air.And taked variable cross-section, and can guarantee that static pressure is invariable, realize balanced ventilation; Adopt each the air port static pressure behind the variable cross-section to tend towards stability simultaneously, make new wind short circuit phenomenon obtain effective improvement.It is little that air channel structure adopts the air port wind speed after variable cross-section is optimized to change than original air port, uiform section air channel wind speed, and tuyere velocity is more even.

With reference to Fig. 6, the relative half elliptic variable cross-section of semicircle variable cross-section of the present utility model, the rectangle variable cross-section, at the air inlet place (less than 10 air ports), the equivalent diameter of semicircle variable cross-section of the present utility model is greater than the half elliptic variable cross-section, the equivalent diameter of rectangle variable cross-section, make friction loss on the unit length air channel of semicircle variable cross-section of the present utility model less than the half elliptic variable cross-section, friction loss on the unit length air channel of rectangle variable cross-section, the speed at place, feasible most of semicircle variable cross-section of the present utility model air port is less than the half elliptic variable cross-section, the speed at the place, air port of rectangle variable cross-section, and when air inlet is far away (greater than 10 air ports), the equivalent diameter of semicircle variable cross-section of the present utility model is less than the equivalent diameter of half elliptic variable cross-section, and the speed that has caused place, last semicircle variable cross-section of the present utility model air port is greater than the half elliptic variable cross-section, the speed at the place, air port of rectangle variable cross-section.

And each air port wind speed uniformity coefficient excursion of semicircle variable cross-section of the present utility model, the air-supply uniformity coefficient standard deviation than half elliptic variable cross-section, rectangle variable cross-section minimum, with reference to Fig. 7.

The described content of this specification embodiment only is enumerating the way of realization of utility model design; protection domain of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection domain of the present utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.

Claims

1. semicircle and variable-section air duct of drying room of automotive body is evenly equipped with side opening on the side in described air channel, it is characterized in that: described air channel is made up of the plurality of sections pipeline section, and the cross section of described pipeline section is semicircle, and the section radius of described pipeline section reduces successively.

2. semicircle and variable-section air duct of drying room of automotive body according to claim 1 is characterized in that: the equal in length of described pipeline section.