CN86105665A

CN86105665A - Forced circulation furnace

Info

Publication number: CN86105665A
Application number: CN86105665.5A
Authority: CN
Inventors: 片冈聡
Original assignee: Chugai Ro Co Ltd
Current assignee: Chugai Ro Co Ltd
Priority date: 1985-07-26
Filing date: 1986-07-23
Publication date: 1987-01-21
Also published as: JPH0227589B2; JPS6226483A; CN1007177B; KR910009587B1; KR870001120A

Abstract

A kind of forced circulation furnace is equipped with: furnace shell, be installed in the recycling fan at furnace shell top, be installed in the furnace shell, in order to form the diaphragm structure of air circulation duct (16), the a pair of upper and lower plates (20a) of eyelet and (20b) of being drilled with that is installed in that the diaphragm structure internal upper part divides, and be installed in be drilled with aperture plate (20a) and (20b) between the space in, and along many division boards (24a), (24b), (24c) of the longitudinal extension of stove, these division boards are used in the above-mentioned space of being spaced laterally apart of stove.In this forced circulation furnace, the air of air circulation duct by recycling fan by being drilled with eyelet plate (20a) and (20b) blow out downwards.

Description

Forced circulation furnace

The present invention relates generally to a kind of forced circulation furnace, be in particular a kind of heat-treatment furnace of glassware.

By convention, for example as a kind of in Japan Patent publication Tokkosho No.58-34416 disclosed forced circulation furnace be widely used as a typical products, wherein diaphragm structure 2 is installed in the stove 1, so that the gap that is limited between diaphragm structure 2 and stove 1 enclosure wall forms air circulation duct 3, as shown in Figure 1.This class forced circulation furnace 1 is equipped with more equipment: be equipped with recycling fan 4 on furnace roof, heater 5 is chewed as burning, conveyer band of being made up of the grid band 6 and the gripper shoe of being made up of a plate that is drilled with eyelet 7.Furnace air is by heater 5 heating, and is recycled air blast 4 circulations later on, and furnace air is blown out up from the furnace bottom part, so that to being placed on the in addition heat treatment of work to be heated on the conveyer belt 6.

Simultaneously, heat-treat equably in order to make with the workpiece on 6, circulating air not only needs sufficient disturbance to make temperature evenly and equably with the workpiece contact, and the air stream in diaphragm structure 2 can not have flowing of inclination.

Yet, under the situation of the common forced circulation furnace of the above-mentioned type, because the furnace air that is present in the air circulation duct of each side of stove is transported to the space below 6 by the lower part from stove, and by being with 6 to be blown into diaphragm structure 2, so causing the workpiece part contacts with air, the part do not contact with air, and also cause air can not stove in length and breadth to blowing into diaphragm structure 2 equably.In addition, owing to for example burn with heater 5 and to chew or air that other similar devices heat can not fully mix with other air, this is owing to the actual conditions of not equipping agitating device in air circulation duct cause, stove in length and breadth to, the stove difference in air temperature is nearly ± and 15 ℃, therefore this temperature difference and the inhomogeneities congener that is blown into air have had a this shortcoming, make workpiece equably heat treatment be extremely difficult.Above-mentioned this phenomenon is also slowly occurring in cooling zone and the cooling zone respectively.

Therefore, basic purpose of the present invention provides a kind of forced circulation furnace of improvement, wherein pending workpiece can be carried out uniform heat treatment by the circulating air in the diaphragm structure, the temperature of circulating air is even, contact equably with workpiece, and stove in length and breadth to evenly being blown in the diaphragm structure.

Another object of the present invention provides a kind of forced circulation furnace of the above-mentioned type, its simple structure and low cost of manufacture.

In order to reach all purposes, according to a most preferred embodiment of the present invention, a kind of forced circulation furnace that is provided has: furnace shell, a recycling fan that is configured in the furnace shell top, be arranged in the diaphragm structure in the furnace shell in order to the formation air circulation duct, the top of diaphragm structure the inside settle a pair of be drilled with eyelet on, lower plywood, and many dividing plates are installed in the determined space between the plate by eyelet, these dividing plates are along the longitudinal extension of stove, in the above-mentioned definite space of horizontal partition, wherein recycling fan sprays the stove air of air circulation duct downwards by the plate that is drilled with eyelet.

The all purpose of the present invention and characteristics are from the clear and Chu that will become of the description below in conjunction with the most preferred embodiment of relevant accompanying drawing, and wherein accompanying drawing has:

Fig. 1 is the profile (front was spoken of) of common forced circulation furnace;

Fig. 2 is the floor map of partial top of the forced circulation furnace of a most preferred embodiment of the present invention;

Fig. 3 is the thermal treatment zone of Fig. 2 and the profile that the soaking zone is exaggerated ratio;

Fig. 4 is the profile that the slow cooling zone of Fig. 2 is exaggerated;

Fig. 5 is the profile that the cooling zone of Fig. 2 is exaggerated;

Fig. 6 penetrates the air state schematic diagram in order to explanation from recycling fan.

Before beginning to describe the present invention, it is also noted that whole accompanying drawing is represented identical parts with identical reference number.

With reference now to these accompanying drawings, be described, Fig. 2 represents the forced circulation furnace of a most preferred embodiment of the present invention.This forced circulation furnace is equipped with heating and soaking zone 10, slowly cooling zone 26 and cooling zone 29.A pending workpiece is with 30 continuously by porose, as a kind of grid band, is carried continuously in above-mentioned zone, so that heat-treat.Each

district

10,26 and 29 comprises

many districts unit

10A, 26A and 29A respectively.

As shown in Figure 3, each district unit 10A of heating and soaking zone 10 generally is equipped with: diaphragm structure 13, recycling fan 17 and the burning as heater chew 19.Diaphragm structure 13 is installed in the furnace shell of being made up of refractory material interlayer 12 11.Heater can be that a kind of radiant tube burning is chewed or electric heater.

And diaphragm structure 13 is included in opposite side a pair of side panel 14 and the shape upper board 15 as hull bottom, and diaphragm structure is hung over below the furnace roof securely.Between the abutment wall of the side panel 14 of diaphragm structure 13 and stove respective side, and with 30 and furnace bottom between the spacing of some regulations is all arranged.Blower vane 18 be fixed on 13 tops of diaphragm structure and then below so that in stove, form air circulation duct 16 and above-mentioned spacing.In addition, burning being chewed 19 is arranged among the process of circulation canal 16.

In this embodiment of the present invention, on the top of diaphragm structure 13 a pair of upper and lower plates 20a and the 20b that is drilled with eyelet is installed, with desired interval they are separated, between upper and lower plates 20a that is drilled with eyelet and 20b, certain space 23 is arranged simultaneously.With three along the vertical extendible dividing plate 24a of stove, 24b and 24c this space 23 along stove laterally further be divided into four parts, promptly from 25a to 25d.Be defined in the upper and lower plates 20a and the 20b that are drilled with eyelet many holes 21 are arranged.And, be defined in each hole that core is drilled with the top plate 20a of eyelet, promptly in the aperture of the core 25b of present embodiment and 25c greater than each aperture that is defined in corresponding lateral section 25a and 25d.On the other hand, some holes that are defined in the lower plywood 20b that is drilled with eyelet have identical diameter, and its diameter is less than the aperture that is defined in the top plate 20a that is drilled with eyelet.So design recycling fan 17 consequently blows out air downwards.

Secondly, as shown in Figure 4, slowly unit, the district 26A of cooling zone 26 is equipped with the cooling carrier pipe 27 that is installed in above the diaphragm structure 13, it is in order to input air, and exhaust carrier pipe 28 in order to the stove air of draining is housed, except the heating and unit, the district 10A parts of soaking zone 10, chew 19 quantity combusted with regulating to burn, with regulating the stove air is remained on needed temperature by cooling off air capacity that carrier pipe 27 imports and the stove air capacity that gives off from exhaust carrier pipe 28 with adjusting.

Unit, the district 29A of cooling zone 29 has parts as shown in Figure 5, and wherein it both be not equipped with to burn and has chewed, and did not have heat insulation structural yet, and this comparison from unit, the district 26A of together slow cooling zone 26 can be found out significantly.

Secondly, the operation that hereinafter explanation is had the forced circulation furnace of said structure.

At first, burning chew 19 and recycling fan 17 when turn round in heating and soaking zone 10, the stove air is pressed the direction circulation shown in the arrow in circulation canal 16, therefore the air of stove is chewed 19 by burning and is heated to required temperature, and lead to recycling fan 17, then, the stove air that is stirred thus is blown into diaphragm structure 13.

So a large amount of stove air are under the centrifugal forces affect that characteristic applied according to recycling fan shown in Figure 6 17, from recycling fan 17 ejection downwards obliquely.

Yet, in the present invention, because the bilevel plate 20a and the 20b that are drilled with eyelet are installed, they are right after below recycling fan 17, and there is bigger diameter in each hole 21 that is defined in the top plate 20a that is drilled with eyelet at core, so not only there is the air capacity that approximately equates to be input to by 25a in the determined space of each part of 25d, even the stove air flows to downwards wherein obliquely, do not flow in the determined space of other parts yet, the stove air equably from regulation be drilled with on the lower plywood 20b of eyelet than flowing out downwards as the crow flies the aperture.

Air flows to aforesaid same procedure and passes through slow cooling zone 26 and cooling zone 29, because heat treatment method is with common identical, so be not described in detail at this.

It should be noted that in the above-described embodiments, obviously the diameter that is defined in each hole of the top plate 20a core that is drilled with eyelet is different from the hole that is defined on the limit, but the plate that is drilled with eyelet can so improve, so that, has same diameter so be defined in each hole that is drilled with on the aperture plate in the hole count of core hole count more than limit portion.

Can be clear that from the embodiment of foregoing invention, in view of the warmed-up circulating air of heater is not directly to import in the diaphragm structure from the place that conveyer belt is installed, and be installed in after recycling fan on the furnace roof fully stirs and mix at circulating air, space with regulation down blows out, this space a pair of be drilled with eyelet and along stove laterally be spaced on, between the lower plywood, therefore workpiece can be applied in Temperature Distribution and the uniform circulating air of flow, and, indulging because can make from the return air quantity that is drilled with the aperture plate outflow, laterally be uniformly, so workpiece can carry out uniform heat treatment.

In addition, even workpiece is the sort of glassware with low thermal conductivity, but the damage that can not cause by thermal deformation.

Though the present invention is described fully by the example of relevant accompanying drawing, it should be noted that here various changes and modifications will be conspicuous concerning those are good at the people of technology.Therefore, unless the sort of variation and improvement have exceeded the scope of the invention, otherwise they should be believed to comprise within the scope of the present invention.

Claims

1, a kind of forced circulation furnace it comprise:

Furnace shell (11);

Be installed in the recycling fan (17) at above-mentioned furnace shell 11 tops;

Be installed in the above-mentioned furnace shell (11), in order to form the diaphragm structure (13) of air circulation duct (16);

The a pair of upper and lower plates (20a) of eyelet and (20b) of being drilled with that is installed in that aforementioned barriers structure (13) internal upper part divides;

Be installed in above-mentioned be drilled with aperture plate (20a) and (20b) between the space in, and along many separators (24a) of the longitudinal extension of stove, (24b) and (24c), they are used for being spaced laterally apart above-mentioned space;

Wherein the air of air circulation duct (16) by recycling fan (17) by being drilled with eyelet plate (20a) and (20b) down blow out.

2, a kind of forced circulation furnace according to claim 1 is characterized in that: above-mentioned space is defined in core and corresponding limit portion is separated into three parts at least.

3, forced circulation furnace according to claim 1 is characterized in that: there is bigger diameter in each hole (21) that is defined in top plate (20a) core that is drilled with eyelet than each hole (21) that is defined in corresponding edge portion.

4, forced circulation furnace according to claim 2 is characterized in that: there is bigger diameter in each hole (21) that is defined in top plate (20a) core that is drilled with eyelet than each hole (21) that is defined in corresponding edge portion.