CN216377923U

CN216377923U - Forced convection device for producing vacuum LOW-E glass by toughening furnace

Info

Publication number: CN216377923U
Application number: CN202123336180.5U
Authority: CN
Inventors: 王小坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-04-26
Anticipated expiration: 2031-12-27

Abstract

The utility model provides a forced convection device for producing vacuum LOW-E glass by a toughening furnace, and belongs to the technical field of toughened glass production equipment. The forced convection device comprises a roller way arranged in the heating furnace, a heating furnace wire, a first nozzle assembly transversely arranged and a second nozzle assembly longitudinally arranged, the heating furnace wire is arranged above the roller way, the first nozzle assembly is arranged below the furnace wire, and the second nozzle assembly is arranged above the furnace wire. The application arranges horizontal and vertical staggered nozzles in the heating furnace, and uses convection wind ejected by the horizontal nozzles to heat the glass integrally; the nozzles which are arranged in the longitudinal direction are unit bodies which can be independently controlled, and the sprayed convection wind can be locally adjusted aiming at the heat absorption degree of the glass; the nozzles distributed in the grid can ensure the integral heating of the glass, and can open or close the nozzles in the local area of the glass, so as to achieve the purpose of leveling the surface of the glass.

Description

Forced convection device for producing vacuum LOW-E glass by toughening furnace

Technical Field

The utility model belongs to the technical field of toughened glass production equipment, and particularly relates to a forced convection device for producing vacuum LOW-E glass by a toughening furnace.

Background

The vacuum glass is a novel glass deep processing product, the production process comprises the steps of sealing the peripheries of two pieces of flat glass, vacuumizing a gap between the two pieces of flat glass and sealing an exhaust hole, wherein the gap between the two pieces of flat glass is 0.3mm, at least one of the two pieces of vacuum glass is LOW-E glass generally, and the gas in a glass cavity is close to a vacuum state, so that the vacuum glass has the advantages of LOW carbon, energy conservation, heat insulation, sound insulation, noise reduction and the like, is an energy-saving and environment-friendly product vigorously advocated by the present country, and has good development potential and prospect.

Two pieces of glass of the vacuum glass or at least one piece of glass is LOW-E toughened glass, in the process of toughening the LOW-E glass, a film layer of the glass faces upwards, and the lower surface of the glass is in contact with a quartz roller way in a heating furnace to carry out reciprocating motion so as to achieve the purpose of uniformly heating the glass. The heating principle is that the heat generated by the furnace wire heats the surface of the glass in the form of the wavelength of the middle far infrared rays, but the coating layer of the glass has the characteristic of high reflection of the middle far infrared rays, so that the surface of the glass film layer cannot absorb the heat generated by the furnace wire in the form of radiation heat transfer, and therefore, an upper forced convection device is arranged on the upper surface of the glass to heat the upper surface of the glass by the high-temperature air of forced convection so as to achieve the purpose that the upper surface of the glass can be heated.

At present, when processing LOW-E glass in vacuum glass, the adopted upper forced convection device is as follows:

set for the fan of corresponding quantity above the heating furnace, the fan passes through the air pipe that connects, the high-temperature gas through air pipe flows through and sets for the nozzle of a certain quantity in the heating furnace, with horizontal or longitudinal arrangement glass upper surface department, through the adjustment to fan impeller speed, reach the jet-propelled speed of the nozzle on the control glass upper surface of being convenient for, thereby carry out quick convection heating to the glass upper surface, reach the endothermic purpose simultaneously with the glass lower surface, thereby glass's roughness in the heating process has been guaranteed, avoid glass limit portion upwards warpage, the rete of having protected glass does not drop because of the warpage. However, such a device has a disadvantage that if a certain number of nozzles are set in the heating furnace to be transversely arranged on the upper surface of the glass (arranged parallel to the quartz roller), the wind pressure in the whole transverse region is relatively uniform in the same high-temperature convection fan unit, and the local wind pressure cannot be correspondingly adjusted according to the heat absorption speed of the glass, so that the heat absorption speed of the edge of the glass in the transverse region is high, and the film layer on the edge is burned, while the heat absorption speed of the middle glass is low, so that the temperature of the glass with the edge is not uniform, and the glass is deformed, and the surface quality and the flatness of the glass cannot be well ensured. If a certain number of nozzles are set in the heating furnace and are longitudinally arranged on the upper surface of the glass (vertical to the quartz roller way), the air pressure in the whole longitudinal area is relatively uniform in the same high-temperature fan unit, and the local air pressure cannot be correspondingly adjusted according to the heat absorption speed of the glass, so that the heat absorption speed of the edge of the glass in the longitudinal area is high, the film layer on the edge is burned, the heat absorption speed of the middle glass is low, the temperature of the glass on the edge is not uniform, deformation is generated, and the surface quality and the flatness of the glass cannot be well guaranteed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a forced convection device for producing vacuum LOW-E glass by a toughening furnace, which aims to solve the technical problem that the glass is heated unevenly by adopting a transverse or longitudinal nozzle in the prior art.

In order to achieve the purpose, the technical solution of the utility model is as follows:

the forced convection device for producing vacuum LOW-E glass by the toughening furnace comprises a roller way, a heating furnace wire, a first nozzle component and a second nozzle component, wherein the roller way, the heating furnace wire, the first nozzle component and the second nozzle component are arranged in the heating furnace, the first nozzle component and the second nozzle component are transversely arranged, the heating furnace wire is arranged above the roller way, the first nozzle component is arranged below the furnace wire, and the second nozzle component is arranged above the furnace wire.

Preferably, the first nozzle assembly comprises a high-temperature resistant fan, a first convection air pipe and a convection air box, and air inlets at the left end and the right end of the first convection air pipe are respectively connected with the high-temperature resistant fan through the convection air boxes at the left side and the right side.

Preferably, the first convection air duct is provided with downward nozzles, and the left side and the right side of the first nozzle assembly are symmetrically arranged.

Preferably, a plurality of second nozzle component units which are independently controlled to operate are arranged in the heating furnace.

Preferably, the second nozzle assembly in the second nozzle assembly unit comprises a second convection pipe and an insulation can, the insulation can is arranged on the top of the heating furnace, one end of the second convection pipe is arranged in the insulation can, the other end of the second convection pipe is arranged in the heating furnace, and the insulation can is provided with an air inlet connected with the second convection pipe.

Preferably, a first electromagnetic valve and an electromagnetic pressure regulating valve are arranged at the air inlet.

Preferably, the heat preservation box is further provided with an air outlet, and the air outlet is provided with a second electromagnetic valve and a valve.

Preferably, one end of the second convection air pipe arranged in the heat preservation box is spiral.

Preferably, a thermocouple for measuring temperature is arranged in the second nozzle assembly unit.

Preferably, the nozzles of the first nozzle assembly and the second nozzle assembly are spaced apart in the vertical space.

The utility model has the beneficial effects that:

the method is characterized in that transverse and longitudinal staggered nozzles are arranged in a heating furnace and are distributed in a grid manner, and convection air ejected by the transversely arranged nozzles is used for integrally heating the glass; the nozzles which are arranged in the longitudinal direction are unit bodies which can be independently controlled, and the sprayed convection wind can be locally adjusted aiming at the heat absorption degree of the glass; therefore, the nozzles distributed in the grid can ensure the integral heating of the glass, and can open or close the nozzles in the local area of the glass, so as to achieve the purpose of flattening the surface of the glass and protect the LOW-E film layer on the upper surface of the glass from being damaged to the greatest extent.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a side view of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 2, the forced convection apparatus for producing vacuum LOW-E glass by a toughening furnace comprises a roller table 100 arranged in a heating furnace, a heating furnace wire 200, a first nozzle assembly 300 transversely arranged and a second nozzle assembly 400 longitudinally arranged, wherein nozzles on the first nozzle assembly 300 and the second nozzle assembly 400 are arranged at intervals in a vertical space so as to improve the uniformity of the heating temperature of the glass. The heating furnace wire 200 is arranged above the roller way 100, the first nozzle assembly 300 is arranged below the heating furnace wire 200, and the second nozzle assembly 400 is arranged above the heating furnace wire 200. When the heating furnace is used for heating the glass 600, the glass 600 enters the furnace through the conveying roller way, and a heating furnace wire is arranged above the roller way. This application is in process of production, and first nozzle subassembly carries out the bulk heating to the glass upper surface, and the second nozzle subassembly supplyes the heating to glass, reaches the required temperature of glass upper surface.

Further, the first nozzle assembly 300 includes a high temperature resistant fan 301, a first convection air duct 302 and a convection air box 303, and air inlets at left and right ends of the first convection air duct 302 are respectively connected with the high temperature resistant fan 301 through the convection air box 303 at left and right sides. Preferably, the first convection air duct 302 is provided with a downward air outlet 305, and the first nozzle assembly is symmetrically arranged on the left and right sides. Air inlets at the left end and the right end of the first convection air pipe are respectively connected with air boxes at two side faces through flanges 304, the first convection air pipes at the left side and the first convection air pipes at the right side are symmetrically arranged, air enters from two sides, and the first convection air pipes at the left side and the right side respectively reach the center line of the width of the furnace body, so that the total length of the first convection air pipes can be reduced, and the deformation of the first convection air pipes is reduced to the maximum extent.

Furthermore, a plurality of second nozzle component units which are independently controlled to operate are arranged in the heating furnace. When the temperature of each position of the glass in the transverse area is different, the second nozzle assembly is correspondingly started to supplement and heat the area range with low temperature, so that the temperature of the glass in the whole transverse area is the same, and the flatness requirement of the glass is ensured.

Further, the second nozzle assembly 400 in the second nozzle assembly unit comprises a second convection air pipe 401 and an insulation can 402, the insulation can 402 is arranged on the top of the heating furnace, one end of the second convection air pipe 401 is arranged in the insulation can, the other end of the second convection air pipe 401 is arranged in the heating furnace, the insulation can 402 is provided with an air inlet 403 connected with the second convection air pipe 401, and the air inlet is provided with a first electromagnetic valve 404 and an electromagnetic pressure regulating valve 405. Preferably, the heat preservation box is further provided with an air outlet 406, and the air outlet is provided with a second electromagnetic valve 407 and a valve 408. Preferably, one end of the second convection duct 401, which is disposed in the heat insulation box, is spiral.

The heat insulation box is arranged at the upper part of the heating furnace and is connected with the upper heating chamber. The heat preservation box is provided with an air outlet 406, and the air outlet is provided with a valve 408 controlled by a second electromagnetic valve 407; the air inlet pipe of the second convection air pipe 401 is placed in the heat preservation box body in a spiral shape, when the second convection air pipe is required to work, the first electromagnetic valve 404 is opened, high-pressure compressed air is adjusted to be required pressure through the electromagnetic pressure regulating valve 405, and therefore high-pressure air is sprayed out and flows through the heating furnace wire to perform temperature compensation heating on the low-temperature glass region. Meanwhile, the second electromagnetic valve 407 on the exhaust port is also opened, so that the valve 408 is opened, the overflow part of the high-pressure gas entering the furnace flows out from the exhaust port, the stable air pressure in the furnace is ensured, meanwhile, the overflowing high-temperature gas also heats the spiral air pipe of the second convection air pipe, the temperature of convection air blown to the surface of the glass is ensured to be very high, the temperature compensation of a low-temperature area of the glass is ensured to the greater extent, the temperature uniformity of the whole area of the glass is achieved, and the requirements of the surface quality and the flatness of the glass are ensured.

The second nozzle assembly unit in this application is an independently controlled small unit, with several such small units in the furnace. Each group of second nozzle component units corresponds to each group of furnace wires, the second convection air pipes and the nozzles on the second convection air pipes are uniformly distributed in the gaps in the middle of the upper surfaces of each group of furnace wires, and the nozzles form an angle of 45-90 degrees with the surface of glass; the air inlet pipe of the second convection air pipe on the middle of each group of furnace wires is independent, the air inlet is provided with a first electromagnetic valve, the on-off control can be carried out according to the temperature of the surface of the glass, when the temperature of the glass is high, the first electromagnetic valve is closed, and the second convection air pipe in the area stops working; when the temperature of the glass is low, the first electromagnetic valve needs to be opened, and the nozzle of the second convection air pipe carries out convection heating on the upper surface of the glass.

Further, a thermocouple 500 for measuring temperature is arranged in the second nozzle assembly unit. This application detects the temperature often of each position in the horizontal region of glass in the heating according to the temperature thermocouple on the glass surface, carry out the temperature comparison often, where the temperature is high, just close the first solenoid valve of corresponding control, where the temperature is LOW, just open the first solenoid valve of corresponding control, thereby let the high temperature high-pressure gas of nozzle spun of second convection flue carry out temperature compensation to glass's LOW temperature district, make glass's heat absorption process go on in step evenly, the temperature of each position is all the same, can guarantee like this that the LOW-E rete on glass surface is not destroyed, the operator has been reduced to the preset's of stove silk temperature curve dependence, the degree of difficulty that the operator set for stove silk temperature curve has been reduced, intelligent operation has been done in the true sense.

The work flow of the application is as follows: when the LOW-E glass is produced, the glass enters the heating furnace through the upper sheet table roller way to be heated, the glass performs reciprocating motion in the heating period, after the glass enters the heating furnace, the front furnace door is closed, firstly, the nozzle of the first convection air pipe of the convection device is forced to spray on the upper surface of the glass, so as to achieve the purpose of synchronously heating the upper surface of the glass and the lower surface of the glass, after the first convection air pipe sprays high-temperature gas for a certain time, the integral temperature of the upper surface of the glass exceeds 500 ℃, the film layer of the LOW-E glass can already absorb the heat radiation heat from the furnace wire, meanwhile, the surface temperature of the glass is detected according to the temperature thermocouple on the upper surface of the glass, the nozzle of the second convection air pipe sprays high-pressure high-temperature gas for compensation heating in the LOW-temperature area, so that the heat absorption process of each area position of the glass is synchronously and uniformly performed, the flatness requirement of the glass is ensured, so that the film layer of the LOW-E glass is not damaged due to deformation.

The heating furnace is provided with a plurality of groups of furnace wires in the width direction, a corresponding second nozzle assembly is set on each group of furnace wires, the temperature of the region is LOW according to the detection of a temperature thermocouple on the upper surface of glass in the furnace in the heating process, the second nozzle assembly at the position is correspondingly opened for spraying, and meanwhile, a convection fan where the first nozzle assembly is positioned is in an idle speed state, so that a power-saving mode is achieved (after the temperature of the glass exceeds 500 ℃, a LOW-E glass film layer can absorb heat from the furnace wires in a radiation heat absorption mode, and the compensation heating of the nozzle B is needed), so that the first nozzle assembly is prevented from always spraying air, and four corners and side parts of the LOW-E film layer are prevented from being burnt. The second nozzle assembly is arranged at the gap above the corresponding group of furnace wires in an independent unit mode, and the sprayed high-pressure gas reaches the surface of the glass with the same temperature as the furnace wires instead of the normal temperature gas temperature of the compressed air after being preheated by the furnace wires below, so that the heating effect is more obvious, and the good quality of the LOW-E film layer of the glass and the smoothness of the glass are ensured.

After the glass is heated, the rear furnace door is opened, and the glass enters the quenching air grid through the quartz roller way to be toughened and quenched, so that the purpose of toughening the glass is achieved. After the air blowing is finished, the glass enters a piece discharging table, and the process is repeated in cycles after waiting for manual or mechanical hand piece discharging.

When the vacuum glass is produced, the used toughened glass is LOW-E toughened glass of a thin plate, the retention time in a heating furnace needs to be reduced because of ensuring high-quality flatness, so the convection heating intensity on a LOW-E film layer needs to be increased, on the basis, in the earlier stage of heating the LOW-E glass, a first nozzle assembly and a second nozzle assembly are simultaneously opened, when the temperature of the glass reaches 500 ℃, the heat from a furnace wire can be absorbed in a radiation heat absorption mode, therefore, after the temperature of the glass reaches 500 ℃, a convection high-temperature fan of the first nozzle assembly is in an idle state and enters a power-saving mode, only the second nozzle assembly is used for heating and compensating a LOW-temperature area, so that the additional heating of high-temperature gas of the high-temperature fan on a quartz roller way in the furnace through the first nozzle assembly is effectively avoided, and the lower surface of the glass is prevented from being scalded, the quality of the four corners and the edges of the LOW-E film layer is fully ensured, and the aims of flattening and saving energy of glass are fulfilled.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The forced convection device for producing vacuum LOW-E glass by the toughening furnace is characterized by comprising a roller way, a heating furnace wire, a first nozzle component and a second nozzle component, wherein the roller way and the heating furnace wire are arranged in the heating furnace, the first nozzle component is transversely arranged, the second nozzle component is longitudinally arranged, the heating furnace wire is arranged above the roller way, the first nozzle component is arranged below the furnace wire, and the second nozzle component is arranged above the furnace wire.

2. The forced convection device for producing vacuum LOW-E glass by the toughening furnace according to claim 1, wherein the first nozzle assembly comprises a high temperature resistant fan, a first convection air pipe and a convection air box, and air inlets at the left and right ends of the first convection air pipe are respectively connected with the high temperature resistant fan through the convection air boxes at the left and right sides.

3. The forced convection apparatus for producing vacuum LOW-E glass by using the toughening furnace as claimed in claim 2, wherein the first convection air duct is provided with downward nozzles, and the first nozzle assemblies are symmetrically arranged on the left and right sides.

4. The forced convection apparatus for vacuum LOW-E glass production by a tempering furnace according to claim 1, wherein a plurality of second nozzle assembly units independently controlled to operate are provided in said heating furnace.

5. The forced convection apparatus for producing vacuum LOW-E glass by using the toughening furnace as claimed in claim 4, wherein the second nozzle assembly in the second nozzle assembly unit comprises a second convection air pipe and an insulation box, the insulation box is arranged at the top of the heating furnace, one end of the second convection air pipe is arranged in the insulation box, the other end of the second convection air pipe is arranged in the heating furnace, and the insulation box is provided with an air inlet connected with the second convection air pipe.

6. The forced convection device for producing vacuum LOW-E glass by the toughening furnace according to claim 5, wherein a first electromagnetic valve and an electromagnetic pressure regulating valve are arranged at the air inlet.

7. The forced convection apparatus for producing vacuum LOW-E glass by using the toughening furnace as claimed in claim 5, wherein an exhaust port is further formed on the heat-preserving box, and a second electromagnetic valve and a valve are arranged at the exhaust port.

8. The forced convection apparatus for vacuum LOW-E glass production by a tempering furnace according to any one of claims 5 to 7, wherein said second convection duct is disposed in the heat-insulating box at one end thereof in a spiral shape.

9. The forced convection apparatus for vacuum LOW-E glass production by a tempering furnace according to claim 8, wherein a thermocouple for measuring temperature is provided in said second nozzle assembly unit.

10. The forced convection apparatus for vacuum LOW-E glass production in a tempering furnace according to claim 1, wherein nozzles of said first and second nozzle assemblies are spaced apart in vertical space.