A double-door observation sight glass for a furnace

Abstract

The present invention relates to a double-door observation sight glass for a furnace, which is characterized in that: it includes a housing, ear seats, a glass sight glass door, a metal door and a locking assembly. Ear seats are symmetrically arranged on the left and right sides of the end of the housing. A glass sight glass door and a metal door are respectively rotatably installed on each ear seat through a pivot. The glass sight glass door and the metal door are locked at the port of the housing through the locking assembly. The design of the present invention is scientific and reasonable, and has the advantages of unrestricted aperture, strong anti-pollution ability, good heat insulation effect, easy maintenance, convenient use and easy implementation. It is a double-door observation sight glass for a furnace with high innovation.

Description

Technical Field

[0001] The invention belongs to the field of rake furnaces, and relates to an observation sight glass, in particular to a double-door observation sight glass for furnaces. Background Art

[0002] The observation sight glass, also called an observation hole, is one of the essential functional devices on industrial thermal equipment. Its function is to observe the operation inside the equipment from the outside of the equipment. The more convenient the observation work is, the more conducive it is to timely discover problems in aspects such as process control and equipment safety, which is crucial for the safe, stable, and efficient operation of the equipment.

[0003] Currently, the fully sealed observation sight glasses used on thermal equipment in various industries are essentially of a plug structure with a glass sheet at the end, that is, a glass sheet is inlaid at the end of a cylindrical outer shell, and the other end of the cylindrical outer shell is arranged on a reserved hole in the furnace wall. The observation sight glass of this structure has the following problems: 1. The furnace ash in the furnace chamber is easily contaminated on the glass sheet of the observation sight glass. The glass sight glass is very easy to accumulate carbon and turn black, and the carbon black is not easy to remove. After a long time, it is easy to cover the glass sheet. Since the glass sheet is fixedly installed on the outer shell, it is not easy to clean the glass sheet, and the maintenance is difficult. This is also the main reason why some observation sight glasses are abandoned by operators for a long time and become ineffective; 2. In order to solve the problem that the glass sheet is easily contaminated, there is a structure in the prior art of installing a ball valve at the reserved hole in the furnace wall and then installing the observation sight glass. However, in order to ensure the effective observation aperture of the observation sight glass, it is necessary to make the aperture of the ball valve larger. After the aperture of the ball valve becomes larger, the corresponding overall ball valve will become larger, which not only increases the area required for installing the observation sight glass, but also increases the weight and cost of the entire furnace body; 3. Due to the limitation of the installation space, the observation aperture of the existing observation sight glass will not be too large, generally not larger than DN80. However, when the furnace chamber temperature is greater than 650 °C, if the net aperture of the observation sight glass is not large enough, the situation inside the furnace chamber cannot be clearly seen, and the purpose of observation cannot be achieved; 4. During maintenance, specific or heavy tools are required, the work is complicated, and the requirements for the responsibility and work skills of maintenance personnel are relatively high. The actual situation at most use sites is that once it is contaminated and turns black or dirty, no one will maintain and use it anymore, and sometimes serious production or equipment accidents will occur. Summary of the Invention

[0004] The purpose of the invention is to provide a double-door observation sight glass for a rake furnace with a scientific and reasonable structural design, an unrestricted aperture, strong anti-pollution ability, easy maintenance, convenient use, and easy implementation.

[0005] The invention solves its technical problems through the following technical solutions:

[0006] A double-door observation sight glass for a furnace, characterized in that it includes a housing, ear seats, a glass sight glass door, a metal door and a locking assembly. Ear seats are symmetrically arranged on the left and right sides of the end of the housing. A glass sight glass door and a metal door are respectively rotatably installed on each ear seat through a pivot. The glass sight glass door and the metal door are locked at the port of the housing through the locking assembly.

[0007] Moreover, the locking assembly includes a tongue piece, a threaded seat and a locking set screw. Tongue pieces horizontally extending inwardly of the door body are provided at the upper and lower ends of the glass sight glass door and the metal door. Threaded seats are installed at the upper and lower ends of the housing. An insertion opening for inserting the tongue piece is provided in the middle of the bottom surface of the threaded seat. A threaded through hole is provided in the threaded seat, and a locking set screw for locking the tongue piece is threadedly installed in the threaded through hole.

[0008] Moreover, it further includes a door handle, and door handles are installed at one ends of the glass sight glass door and the metal door away from the pivot.

[0009] Moreover, it further includes a heat insulation layer. A heat insulation layer is provided on the inner wall of the housing. A pressing retaining ring is provided on the outer end surface of the heat insulation layer. The pressing retaining ring is fixedly installed by screws evenly distributed in a circle on the housing.

[0010] Moreover, it further includes a sealing ring, and a sealing ring is provided at the outer end of the pressing retaining ring.

[0011] The advantages and beneficial effects of the present invention are as follows:

[0012] 1. For this double-door observation sight glass for a furnace, through the design of the double doors of the glass sight glass door and the metal door, it can be switched according to the usage needs. After the glass sight glass door is opened, it can be cleaned. In the normal state, the door with the glass sight glass is opened into the ambient air, thereby improving its anti-pollution ability; through the pivot, the two doors can also be disassembled for convenient cleaning. And, it is not restricted by valves. As long as the installation space permits, it can maximize the diameter of the observation sight glass to meet the purpose of effective observation.

[0013] 2. For this double-door observation sight glass for a furnace, through the design of the locking assembly, the quick closing, locking and opening of the glass sight glass door and the metal door are realized, which is convenient for operation while meeting the usage requirements.

[0014] 3. The double-door observation sight glass for this furnace, due to the limitation of the observation aperture on the existing observation sight glass, makes it difficult for the observation sight glass itself to be equipped with a thermal insulation layer. When the furnace temperature is greater than 400 °C, it is necessary to introduce cooling air into the observation sight glass to cool it down. However, in some equipment processes, it is not allowed to introduce cold air into the equipment. Through the improvement of the structure of this observation sight glass, the aperture of the observation sight glass is increased, thereby increasing the design of the thermal insulation layer, playing a role in heat insulation, and avoiding damage to the observation sight glass caused by high temperature; at the same time, the operation of introducing cold air into the equipment to cool it down is omitted, saving costs and facilitating operation.

[0015] 4. The double-door observation sight glass for this furnace, through the design of the sealing retaining ring, can ensure the sealing performance after the door is closed.

[0016] 5. The design of the present invention is scientific and reasonable, with the advantages of unrestricted aperture, strong anti-pollution ability, good heat insulation effect, easy maintenance, convenient use, and easy implementation. It is a double-door observation sight glass for furnaces with high innovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is Figure 1 the sectional view taken along the line A-A of

[0019] Figure 3 is the top view of the present invention.

[0020] DESCRIPTION OF THE REFERENCE NUMERALS

[0021] 1 - Locking set screw, 2 - Threaded seat, 3 - Tongue piece, 4 - Screw, 5 - Door handle, 6 - Pivot, 7 - Outer shell, 8 - Furnace wall reserved hole, 9 - Thermal insulation layer, 10 - Compression retaining ring, 11 - Sealing ring, 12 - Metal door, 13 - Glass sight glass door, 14 - Ear seat. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0023] A double-door observation sight glass for a furnace, characterized in that: it includes an outer shell 7, an ear seat 14, a glass sight glass door 13, a metal door 12 and a locking assembly. Ear seats are symmetrically arranged on the left and right sides of the end of the outer shell. A glass sight glass door and a metal door are respectively rotatably installed on each ear seat through a pivot 6. The glass sight glass door and the metal door are locked at the port of the outer shell through the locking assembly. The outer shell is cylindrical and is concentrically arranged with the furnace wall reserved hole. After the glass sight glass door or the metal door is closed, it covers the outer side of the barrel opening of the outer shell, and the inner side of the barrel opening is welded at the furnace wall reserved hole 8.

[0024] The described locking assembly includes a tongue piece 3, a threaded seat 2 and a locking set screw 1. Tongue pieces horizontally extending inwardly of the door are provided at both upper and lower ends of the glass sight glass door and the metal door. Threaded seats are installed at both upper and lower ends of the housing. An insertion opening for inserting the tongue piece is provided in the middle of the bottom surface of the threaded seat. A threaded through hole is provided in the threaded seat, and a locking set screw for locking the tongue piece is threadedly installed in the threaded through hole. The locking assemblies provided up and down on the housing can fix the closed glass sight glass door or metal door, and only need to screw the locking set screw, which is simple and convenient.

[0025] It further includes a door handle 5, and the door handle is installed at one end of the glass sight glass door and the metal door away from the pivot. The provision of the door handle facilitates the opening and closing of the glass sight glass door and the metal door.

[0026] It further includes a heat insulation layer 9. A heat insulation layer is provided on the inner wall of the housing, and a pressing retaining ring 10 is provided on the outer end surface of the heat insulation layer. The pressing retaining ring is fixedly installed by screws 4 evenly distributed in a circle on the housing. A 50-mm-thick fiber heat insulation layer is provided in a circle on the inner wall of the cylinder. This heat insulation layer can effectively protect the housing from the influence of high temperature and extend the service life of the device. After the heat insulation layer is formed in a circle, its diameter is greater than or equal to the diameter of the reserved hole in the furnace wall.

[0027] It further includes a sealing ring 11. A sealing ring is provided at the outer end of the pressing retaining ring, which can play a sealing role after the glass sight glass door or the metal door is closed.

[0028] The present invention does not require the installation of valves and flange connections. When the net caliber is the same, the cost is much lower than and the external dimensions are much smaller than the prior art. As long as the installation space permits, there is no limit to the maximum caliber (the outer diameter of the cylinder net caliber There are already application examples);

[0029] As long as the installation space permits, there is no limit to the length either. It has a self-contained heat insulation layer structure and does not require cooling air to be introduced into the observation hole, and can be applied to thermal equipment with any furnace temperature;

[0030] Anti-pollution, because: when the observation function is not in use, the door with the glass sight glass is in the open state and is completely in the air in the natural state, without carbon deposition problems. Occasionally, there is a small amount of dust accumulation, which can be wiped off;

[0031] Operations such as opening / closing, locking / relaxing, disassembling / assembling of the two doors can be carried out by hand without the need to use any tools at all, and one opening and one closing can be completed within 5 seconds (much faster than the opening / closing speed of the spectacle valve used for cutting off toxic gas). Even if one of the doors is completely removed, it will not affect the sealing performance of the observation hole and the normal operation of the device at all.

[0032] In summary, the advantages of the present invention are as follows: low cost, extremely few usage restrictions, unrestricted observation aperture, extremely convenient maintenance and use, and it is a revolutionary improvement to the existing high-temperature observation hole.

[0033] During use, directly weld the metal shell of this observation sight glass to the reserved hole in the furnace wall; when observation is not required, close the metal door. At this time, the glass sight glass door is in the open position; when observation is required, open the metal door and close the glass sight glass door; when any one of the doors is closed, it is locked by two locking set screws arranged up and down; the compression retaining ring is used to compress the heat insulation layer, and the sealing ring (soft cushion layer) on its back can achieve complete sealing when the door is closed; loosen the 4 screws on the outer periphery of the shell, and the compression retaining ring can be taken out to realize the installation or maintenance of the heat insulation layer; remove the pivot, and the door can be taken down as a whole, which is very convenient for maintenance.

[0034] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art can understand that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A double-door observation sight glass for a furnace, characterized in that: It includes a housing, ear seats, a glass viewing door, a metal door and a locking assembly. Ear seats are symmetrically arranged on the left and right sides at the end of the housing. A glass viewing door is rotatably mounted on the ear seat at one end through a pivot, and a metal door is rotatably mounted on the ear seat at the other end through a pivot. The glass viewing door and the metal door are locked at the port of the housing through the locking assembly; The locking assembly includes a tongue piece, a threaded seat and a locking set screw. Tongue pieces horizontally extending inwardly into the door body are provided at both the upper and lower ends of the glass viewing door and the metal door. Threaded seats are installed at both the upper and lower ends of the housing. An insertion opening for inserting the tongue piece is provided in the middle of the bottom surface of the threaded seat. A threaded through hole is provided in the threaded seat, and a locking set screw for locking the tongue piece is threadedly installed in the threaded through hole; It further includes a heat insulation layer. A heat insulation layer is provided on the inner wall of the housing. A pressing retaining ring is provided on the outer end face of the heat insulation layer, and the pressing retaining ring is fixedly installed by screws evenly distributed in a circle on the housing. It further includes a sealing ring. A sealing ring is provided at the outer end of the pressing retaining ring; During use, the housing of this observation sight glass is directly welded to the reserved hole in the furnace wall. When observation is not required, the metal door is closed. At this time, the glass viewing door is in the open position. When observation is required, the metal door is opened and the glass viewing door is closed. When any one of the doors is closed, it is locked by two locking set screws arranged vertically. The pressing retaining ring is used to press the heat insulation layer, and the sealing ring on its back can achieve complete sealing when the door is closed. By loosening the screws on the outer periphery of the housing, the pressing retaining ring can be taken out to install or maintain the heat insulation layer. By removing the pivot, the door can be taken off as a whole.

2. The double-door observation sight glass for furnace according to claim 1, wherein: It further includes door handles. Door handles are installed at the ends of the glass viewing door and the metal door away from the pivot.

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