Convection heating device for glass tempering heating furnace

Abstract

The utility model discloses a convection heating device for a glass tempering heating furnace. A plurality of air guide holes are formed in an air guide plate; the air guide hole penetrates through the air guide plate; the air outlet plate is provided with a plurality of concave heating grooves and a plurality of air outlet holes; the multiple heating grooves are arranged at intervals in the width direction of the heating furnace. At least one group of heating wires are distributed in each heating groove; the bottom face of the air guide plate abuts against the top face of the peripheral groove wall of the heating groove. The plurality of air guide holes are divided into a plurality of groups, a group of air guide holes are correspondingly distributed right above each heating groove, and the plurality of air guide holes in the same group are arranged at intervals; the plurality of air outlet holes are divided into a plurality of groups, a group of air outlet holes are correspondingly formed in the groove bottom of each heating groove, and the plurality of air outlet holes are uniformly distributed and penetrate through the groove bottom of the heating groove. By adjusting the input current and the input voltage of the heating wire in the corresponding heating groove, the temperature of the hot air flow output by each heating groove is matched with the heat absorption characteristic and the temperature distribution condition of the corresponding part of the glass to be heated.

Description

Technical Field

[0001] The utility model relates to the technical field of glass tempering equipment, in particular to a convection heating device for a glass tempering heating furnace. Background Art

[0002] In the prior art of glass tempering, the glass to be tempered is heated by a heating furnace to soften the surface of the glass to be tempered, and then the heated glass to be tempered is quenched by the rapid cooling section of a wind grid to be tempered.

[0003] The heating furnace in the prior art outputs a circulating hot air flow to the surface of the glass to be heated through a convection heating device composed of the cooperation of a centrifugal fan and a heating air bag, so that the glass to be heated is heated and softened.

[0004] Since the hot air flow near the two inner cavity walls of the heating furnace parallel to the glass running direction will form turbulence, the two edges of the glass to be heated parallel to the glass running direction are liable to be heated, absorb heat and have a relatively high temperature, resulting in a low uniformity of the temperature distribution on the surface of the glass to be heated.

[0005] The convection heating device in the prior art is installed with two air equalizing plates spaced downward, and multiple groups of heating wires are installed between the two air equalizing plates. Such an installation structure can make the hot air flow output by the convection heating device have relatively uniform air temperature and air pressure, but such an installation structure cannot make the air temperature of the hot air flow output by the convection heating device match the heat absorption characteristics and temperature distribution of the corresponding parts of the glass to be heated, that is, it cannot output a hot air flow with a lower air temperature to the parts of the glass to be heated with a relatively high temperature or easy heat absorption, and output a hot air flow with a higher air temperature to the parts of the glass to be heated with a relatively low temperature or difficult heat absorption. Content of the Utility Model

[0006] Aiming at the above deficiencies, the purpose of the utility model is to provide a convection heating device for a glass tempering heating furnace, which solves the problem that the convection heating device cannot output hot air flows with different air temperatures according to the different heat absorption characteristics and temperature distributions of the parts of the glass to be heated.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A convection heating device for a glass tempering heating furnace, along the glass running direction, a plurality of convection heating devices arranged at intervals are installed in the heating furnace. The convection heating device includes a centrifugal fan, an air guiding pipe, a heating air bag and multiple groups of heating wires. The centrifugal fan is connected to the top of the heating air bag through the air guiding pipe. Multiple groups of heating wires are installed in the heating air bag. The heating air bag includes an air bag cover, a wind guiding plate and an air outlet plate;

[0009] The air deflector is provided with a plurality of air guide holes; the air guide holes penetrate through the air deflector; the air outlet plate is provided with a plurality of concave heating grooves and is provided with a plurality of air outlet holes;

[0010] The plurality of heating grooves are arranged at intervals along the width direction of the heating furnace; at least one set of the heating wires is arranged in each heating groove; the bottom surface of the air deflector abuts against the top surfaces of the peripheral groove walls of the heating groove; the plurality of air guide holes are divided into multiple groups, and a group of the air guide holes is correspondingly distributed directly above each heating groove, and the plurality of air guide holes in the same group are arranged at intervals; the plurality of air outlet holes are divided into multiple groups, and a group of air outlet holes is correspondingly arranged at the bottom of each heating groove, and the plurality of air outlet holes are uniformly arranged and penetrate through the bottom of the heating groove.

[0011] Further, the heating air bag further includes a plurality of return air pipes;

[0012] The air bag cover is provided with a plurality of upper return air pipe mounting holes, and the air outlet plate is further provided with a plurality of lower return air pipe mounting holes;

[0013] The plurality of upper return air pipe mounting holes are divided into multiple groups, and the plurality of lower return air pipe mounting holes are divided into multiple groups; the plurality of upper return air pipe mounting holes in the same group and the plurality of lower return air pipe mounting holes in the same group are in one-to-one vertical correspondence and are respectively arranged at intervals between two adjacent heating grooves;

[0014] The return air pipe is provided with a hollow interior; the outer peripheral surface of the lower end of the return air pipe is connected to the hole wall of the lower return air pipe mounting hole; the upper end of the return air pipe passes through the corresponding upper return air pipe mounting hole, the upper end of the return air pipe is exposed outside the top surface of the air bag cover, and the outer peripheral surface of the upper end of the return air pipe is connected to the hole wall of the upper return air pipe mounting hole.

[0015] Preferably, the air guide hole is a long strip-shaped through hole, and the length extension direction of the air guide hole is the same as the length extension direction of the heating groove.

[0016] Specifically, a plurality of the heating wires are arranged in the heating groove, and the helically coiled heating wires extend along the length direction of the heating groove;

[0017] The plurality of air guide holes in the same group are divided into multiple columns, and the plurality of air guide holes in the same column are arranged at straight-line intervals along the extension direction of the heating wire, and the multiple columns of air guide holes are vertically opposite to the multiple heating wires one by one.

[0018] Preferably, the extension direction of the heating groove is set to be deflected with respect to the running direction of the glass;

[0019] The included angle between the extension direction of the heating groove and the running direction of the glass is 5-10°.

[0020] Preferably, along the direction of glass movement, one end of the heating tank extends outside the air bag cover and is exposed.

[0021] On the plate surface of the air guide plate above the exposed heating tank, there is a power cord insertion hole, which is used to install the power cord electrically connected to the corresponding heating wire.

[0022] Furthermore, along the direction perpendicular to the glass movement, the air bag cover is divided into two cover bodies;

[0023] One ends of the two cover bodies of the air bag cover are connected by a connecting plate; an air inlet hole is provided in the middle of the cover body, the output port of the air guide pipe is communicated with the air inlet hole, and the input port of the air guide pipe is communicated with the output port of the centrifugal fan;

[0024] The connecting plate is provided with a communication hole, and the inner cavities of the two cover bodies of the air bag cover are communicated through the communication hole.

[0025] The technical solution of a convection heating device for a glass tempering furnace proposed by the present utility model has the beneficial effect that: at least one group of heating wires is arranged in each heating tank, a group of air outlet holes is arranged at the bottom of the heating tank, and a group of air guide holes is provided directly above the heating tank on the air guide plate covering the surrounding tank walls of the heating tank, so that each heating tank forms an independent convection air heating cavity. According to the heat absorption characteristics and temperature distribution of each part of the glass to be heated, and by adjusting the input current and input voltage of the heating wires in the corresponding heating tank, the temperature of the hot air flow output from each heating tank can be made to match the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the temperature distribution uniformity of the surface of the heated glass. Description of the Drawings

[0026] Figure 1 is a schematic installation structure diagram of an embodiment of a convection heating device for a glass tempering furnace of the present utility model;

[0027] Figure 2 is Figure 1 an enlarged view of part A;

[0028] Figure 3 is a schematic structure diagram of the heating air bag 23;

[0029] Figure 4 is Figure 3 a schematic bottom-up structure diagram of the air outlet plate 233 in;

[0030] Figure 5 is Figure 3 an enlarged view of part B;

[0031] Wherein: heating furnace 1; convection heating device 2; centrifugal fan 21; air duct 22; heating air bag 23; multiple groups of heating wires 24; air inlet 210; heating tank 230; air bag cover 231; air guide plate 232; air outlet plate 233; return air duct 234; air inlet hole 2310; upper return air duct installation hole 2311; air guide hole 2321; air outlet hole 2331; lower return air duct installation hole 2332; connecting hole 23121. Detailed implementation mode

[0032] The following combines the attached Figures 1-5 And further illustrate the technical solution of the present utility model through specific implementation modes.

[0033] The attached drawings are only for illustrative purposes and cannot be construed as limitations on this patent; in order to better illustrate this embodiment, some components in the attached drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be said that the interiors of two components are connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] A convection heating device for a glass tempering heating furnace. Along the glass running direction, a plurality of convection heating devices 2 arranged at intervals are installed in the heating furnace 1. The convection heating device 2 includes a centrifugal fan 21, an air duct 22, a heating air bag 23, and multiple groups of heating wires 24. The centrifugal fan 21 is connected to the top of the heating air bag 23 through the air duct 22. Multiple groups of heating wires 24 are installed in the heating air bag 23. The heating air bag 23 includes an air bag cover 231, an air guide plate 232, and an air outlet plate 233;

[0036] The air guide plate 232 is provided with a plurality of air guide holes 2321; the air guide holes 2321 penetrate through the air guide plate 232; the air outlet plate 233 is provided with a plurality of concave heating tanks 230 and is provided with a plurality of air outlet holes 2331;

[0037] A plurality of the heating grooves 230 are arranged at intervals in the width direction of the heating furnace 1; at least one group of the heating wires 24 is arranged in each heating groove 230; the bottom surface of the air guide plate 232 abuts against the top surfaces of the peripheral groove walls of the heating groove 230; the plurality of air guide holes 2321 are divided into multiple groups, and a group of the air guide holes 2321 is correspondingly distributed directly above each heating groove 230, and the multiple air guide holes 2321 in the same group are arranged at intervals; the plurality of air outlet holes 2331 are divided into multiple groups, and a group of air outlet holes 2331 is correspondingly arranged at the bottom of each heating groove 230, and the multiple air outlet holes 2331 are uniformly arranged and penetrate through the bottom of the heating groove 230.

[0038] Figure 1 Schematic diagram of the installation structure of an embodiment of a convection heating device for a glass tempering heating furnace of the present utility model; Figure 2 is Figure 1 an enlarged view of part A of; Figure 3 Schematic diagram of the structure of the heating air bag 23, Figure 3 an air inlet hole 2310 is opened at the top of the air bag cover 231 in, the output end of the air guide pipe 22 inputs the air to be heated into the heating air bag 23 through the air inlet hole 2310, and the front direction in the figure is the running direction of the glass; Figure 4 is Figure 3 a schematic diagram of the structure of the air outlet plate 233 in the upward view direction in.

[0039] For a convection heating device for a glass tempering heating furnace of the present utility model, at least one group of heating wires is arranged in each heating groove 230, a group of air outlet holes 2331 is arranged at the bottom of the heating groove 230, and a group of air guide holes 2321 is opened directly above the heating groove 230 on the air guide plate 232 covering the peripheral groove walls of the heating groove 230, so that each heating groove 230 forms an independent convection air heating cavity, and the input current and input voltage of the heating wire 24 in the corresponding heating groove 230 can be adjusted to make each heating groove 230 output the required hot air flow temperature.

[0040] Further, the heating air bag 23 further includes a plurality of return air pipes 234;

[0041] A plurality of upper return air pipe mounting holes 2311 are opened in the air bag cover 231, and a plurality of lower return air pipe mounting holes 2332 are further opened in the air outlet plate 233;

[0042] The plurality of upper return air pipe mounting holes 2311 are divided into multiple groups, and the plurality of lower return air pipe mounting holes 2332 are divided into multiple groups; the multiple upper return air pipe mounting holes 2311 in the same group and the multiple lower return air pipe mounting holes 2332 in the same group are in one-to-one correspondence up and down, and are respectively arranged at intervals between two adjacent heating grooves 230;

[0043] The return air duct 234 is hollow; the outer peripheral surface of the lower end of the return air duct 234 is connected to the hole wall of the lower return air duct mounting hole 2332; the upper end of the return air duct 234 passes through the corresponding upper return air duct mounting hole 2311, the upper end of the return air duct 234 is exposed on the top surface of the air bag cover 231, and the outer peripheral surface of the upper end of the return air duct 234 is connected to the hole wall of the upper return air duct mounting hole 2311.

[0044] As Figure 1 shown, the air inlet 210 of the centrifugal fan 21 faces downward and is aligned with the middle of the top surface of the heating air bag 23. The centrifugal fan 21 continuously conveys the air input from the air inlet 210 to the top of the heating air bag 23 through the air guiding duct 22, and forms a circulating hot air flow.

[0045] As Figures 1-4 shown, the hot air flow output through the plurality of air outlet holes 2331 blows downward to the surface of the glass to be heated. After the hot air flow contacts the surface of the glass to be heated, it rebounds upward. Under the attraction of the air inlet 210 of the centrifugal fan 21, the rebounding hot air flow returns to the top surface of the heating air bag 23 through the plurality of return air ducts 234.

[0046] Compared with the prior art technical solution of hot air flow reflux through the four sides of the heating air bag 23, the hot air flow reflux speed of the present utility model adopting the plurality of return air ducts 234 is fast, the reflux efficiency is high, and it is beneficial to improve the heating efficiency of the convection heating device 2.

[0047] Preferably, the air guiding hole 2321 is a long strip-shaped through hole, and the length extension direction of the air guiding hole 2321 is the same as the length extension direction of the heating groove 230.

[0048] As Figure 3 and Figure 5 shown, the air guiding hole 2321 which is a long strip-shaped through hole has a smaller air resistance, can reduce the flow velocity loss of the air flow passing through the air guiding plate 232 and entering the heating groove 230, and helps to improve the heating efficiency of the convection heating device 2 for the glass to be heated.

[0049] Specifically, a plurality of the heating wires 24 are arranged in the heating groove 230, and the helically coiled heating wires 24 extend along the length direction of the heating groove 230;

[0050] A plurality of the air guiding holes 2321 in the same group are divided into multiple columns, and the plurality of the air guiding holes 2321 in the same column are arranged at intervals in a straight line along the extension direction of the heating wire 24, and the multiple columns of the air guiding holes 2321 are vertically opposite to the plurality of the heating wires 24 one by one.

[0051] As Figure 2 、 Figure 3 and Figure 5As shown, the arrangement of the air guiding holes 2321 and the heating wire 24 opposite to each other up and down can improve the heat exchange efficiency between the air flow entering the heating tank 230 through the air guiding holes 2321 and the corresponding heating wire 24.

[0052] Moreover, the far-infrared rays emitted by the heating wire 24 can also radiate through the air guiding holes 2321 which are long strip-shaped through holes and enter the space between the air guiding plate 232 and the air bag cover 231, so that the air flow can be preheated by the far-infrared rays emitted by the heating wire 24 before entering the air guiding holes 2321, which can further improve the heating efficiency of the convection heating device 2.

[0053] In addition, the air flow entering the heating tank 230 through the air guiding holes 2321 contacts the corresponding heating wire 24, and the air flow is dispersed and diffused around, and there will be no phenomenon that the air flow directly passes through the air outlet hole 2331 aligned below through the air guiding holes 2321 and blows on the surface of the glass to be heated, which is beneficial to reducing the wind spots on the surface of the glass to be heated.

[0054] Preferably, the extending direction of the heating tank 230 is set to be biased relative to the running direction of the glass;

[0055] The included angle between the extending direction of the heating tank 230 and the running direction of the glass is 5-10°.

[0056] As Figure 4 shown, since there is a gap between two adjacent heating tanks 230 and no air outlet hole 2331 is provided in the gap, if the extending direction of the heating tank 230 is parallel to the running direction of the glass, it will cause a lack of hot air flow blowing on the surface part of the glass to be heated between the two heating tanks 230.

[0057] The arrangement that the extending direction of the heating tank 230 is biased at an included angle of 5-10° relative to the running direction of the glass can overcome the defect of lack of hot air flow blowing on the surface part of the glass to be heated.

[0058] Optionally, along the running direction of the glass, one end of the heating tank 230 extends outside the air bag cover 231 and is exposed;

[0059] On the plate surface of the air guiding plate 232 above the exposed heating tank 230, there is a power line insertion hole, and the power line insertion hole is used for installing a power line electrically connected to the corresponding heating wire 24.

[0060] As Figure 3 shown, the arrangement that one end of the heating tank 230 is exposed outside the air bag cover 231 can improve the installation convenience of the power line of the heating wire 24, can avoid opening a corresponding power line installation hole in the air bag cover 231, and simplifies the internal structure of the heating air bag 23.

[0061] Further, along the direction perpendicular to the movement of the glass, the air bag cover 231 is divided into two cover bodies;

[0062] One end of the two cover bodies of the air bag cover 231 is connected by a connecting plate 2312; an air inlet hole 2310 is provided in the middle of the cover body, the output port of the air guiding pipe 22 is communicated with the air inlet hole 231, and the input port of the air guiding pipe 22 is communicated with the output port of the centrifugal fan 21;

[0063] The connecting plate 2312 is provided with a communication hole 23121, and the inner cavities of the two cover bodies of the air bag cover 231 are communicated through the communication hole 23121.

[0064] As Figure 1 and Figure 5 shown, the centrifugal fan 21 inputs air flow into the two cover bodies of the air bag cover 231 from the left and right sides respectively through the air guiding pipe 22, and the two cover bodies of the air bag cover 231 are communicated through the connecting plate 2312 provided with the communication hole 23121, so that the air pressures in the two cover bodies can be kept balanced.

[0065] In summary, in the embodiment of the present invention as Figures 1-5 shown, for the convection heating device of the glass tempering furnace, each heating tank 230 forms an independent convection air heating cavity, and according to the heat absorption characteristics and temperature distribution of each part of the glass to be heated, and by adjusting the input current and input voltage of the heating wire 24 in the corresponding heating tank 230, the temperature of the hot air flow output by each heating tank 230 can be made to match the heat absorption characteristics and temperature distribution of the corresponding part of the glass to be heated, thereby improving the temperature distribution uniformity of the surface of the heated glass.

[0066] The technical principle of the present invention has been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be construed in any way as a limitation on the protection scope of the present invention. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present invention without creative labor, and these embodiments will fall within the protection scope of the present invention.

Claims

1. A convection heating device for a glass tempering furnace. Along the glass running direction, a plurality of convection heating devices arranged at intervals are installed in the heating furnace. The convection heating device includes a centrifugal fan, an air duct, a heating air bag, and multiple groups of heating wires. The centrifugal fan is connected to the top of the heating air bag through the air duct. Multiple groups of heating wires are installed in the heating air bag. The heating air bag includes an air bag cover, a wind guiding plate, and an air outlet plate. It is characterized in that: The wind guiding plate is provided with a plurality of wind guiding holes; the wind guiding holes penetrate through the wind guiding plate; the air outlet plate is provided with a plurality of concave heating grooves and is provided with a plurality of air outlet holes; The plurality of heating grooves are arranged at intervals along the width direction of the heating furnace; at least one group of the heating wires is arranged in each heating groove; the bottom surface of the wind guiding plate abuts against the top surfaces of the peripheral groove walls of the heating groove; the plurality of wind guiding holes are divided into multiple groups, and a group of the wind guiding holes is correspondingly distributed directly above each heating groove. The multiple wind guiding holes in the same group are arranged at intervals; The plurality of air outlet holes are divided into multiple groups, and a group of air outlet holes is correspondingly arranged at the bottom of each heating groove. The plurality of air outlet holes are evenly arranged and penetrate through the bottom of the heating groove.

2. The convection heating device for a glass tempering furnace according to claim 1, wherein, The heating air bag further includes a plurality of return air ducts; The air bag cover is provided with a plurality of upper return air duct mounting holes, and the air outlet plate is further provided with a plurality of lower return air duct mounting holes; The plurality of upper return air duct mounting holes are divided into multiple groups, and the plurality of lower return air duct mounting holes are divided into multiple groups; the multiple upper return air duct mounting holes in the same group and the multiple lower return air duct mounting holes in the same group are in one-to-one vertical correspondence and are respectively arranged at intervals between two adjacent heating grooves; The return air duct is hollow; the outer peripheral surface of the lower end of the return air duct is connected to the hole wall of the lower return air duct mounting hole; the upper end of the return air duct passes through the corresponding upper return air duct mounting hole, the upper end of the return air duct is exposed outside the top surface of the air bag cover, and the outer peripheral surface of the upper end of the return air duct is connected to the hole wall of the upper return air duct mounting hole.

3. The convection heating device for a glass tempering furnace according to claim 1, characterized in that, The wind guiding hole is a long strip-shaped through hole, and the length extension direction of the wind guiding hole is the same as the length extension direction of the heating groove.

4. The convection heating device for a glass tempering furnace according to claim 3, characterized in that, A plurality of the heating wires are arranged in the heating groove, and the helically coiled heating wires extend along the length direction of the heating groove; The multiple wind guiding holes in the same group are divided into multiple columns, and the multiple wind guiding holes in the same column are arranged at straight-line intervals along the extension direction of the heating wire. The multiple columns of wind guiding holes and the multiple heating wires are in one-to-one vertical correspondence.

5. The convection heating device for a glass tempering furnace according to claim 1, characterized in that, The extension direction of the heating groove is set to be deflected relative to the glass running direction; The included angle between the extension direction of the heating groove and the glass running direction is 5-10°.

6. The convection heating device for a glass tempering furnace according to claim 1, characterized in that, Along the glass running direction, one end of the heating groove extends outside the air bag cover and is exposed; The plate surface of the wind guiding plate above the exposed heating groove is provided with a power cord insertion hole, and the power cord insertion hole is used for installing a power cord electrically connected to the corresponding heating wire.

7. The convection heating device for a glass tempering furnace according to claim 1, characterized in that, Along the direction perpendicular to the glass running direction, the air bag cover is divided into two cover bodies; One end of the two covers of the air receiver cover is connected by a connecting plate; an air inlet hole is provided in the middle of the cover, the output port of the air guiding pipe is communicated with the air inlet hole, and the input port of the air guiding pipe is communicated with the output port of the centrifugal fan; The connecting plate is provided with a communication hole, and the inner cavities of the two covers of the air receiver cover are communicated through the communication hole.

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