Tubular heating furnace device

Abstract

The utility model relates to the technical field of heating furnaces, and discloses a tubular heating furnace device which comprises two shells which are oppositely arranged and can be overturned, opened and closed in the longitudinal direction, furnace bodies are embedded in the opposite sides of the two shells, and a combustion tube used for sample combustion is arranged on one side of each furnace body in a penetrating mode. A heating mechanism for heating the combustion tube is arranged in the furnace body; a heat preservation and insulation layer is arranged on the outer side of the furnace body and located between the furnace body and the shell. The heat preservation and insulation layer comprises a box body for containing the furnace body, and a heat insulation assembly is arranged between the box body and the furnace body. The heat preservation and insulation layer is additionally arranged between the furnace body and the shell, so that in the process of heating the combustion tube, the temperature in the furnace can be blocked, too fast loss of the temperature is avoided, the furnace body and the shell can be separated through the heat insulation assembly, and deformation of the shell caused by heating is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heating furnaces, in particular to a tubular heating furnace device. Background Art

[0002] In order to measure the total amount of halogen acid gases other than hydrofluoric acid released during combustion of a mixture based on halogenated polymers and / or halogen-containing additives, it is necessary to heat the mixture taken from the cable or optical cable structure in a heating furnace so that it burns to generate gas for subsequent composition measurement.

[0003] However, the existing heating furnace equipment on the market has no internal thermal insulation layer, which will lead to slow heating and thus fail to meet the test requirements (uniformly heating to 800±10℃ within 40±5 minutes). Moreover, after heating to 800℃, the outer shell of the equipment will be severely deformed due to the high temperature, affecting the test. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a tubular heating furnace device, by adding a thermal insulation layer between the furnace body and the outer shell, so that during the heating process, the temperature in the furnace can be blocked to prevent the temperature from being lost too quickly, and the furnace body and the outer shell of the heating furnace can be isolated to prevent the outer shell from being deformed due to heat.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A tubular heating furnace device, comprising two shells arranged opposite to each other and capable of being turned over and opened and closed in the longitudinal direction, a furnace body is embedded in the opposite sides of the two shells, a combustion tube for sample combustion is penetrated through one side of the furnace body, and a heating mechanism for heating the combustion tube is arranged inside the furnace body;

[0007] A heat-insulating layer is arranged on the outer side of the furnace body, and the heat-insulating layer is located between the furnace body and the outer shell; the heat-insulating layer comprises a box body for accommodating the furnace body, and a heat-insulating component is arranged between the box body and the furnace body.

[0008] In a preferred embodiment of the utility model, a furnace for installing the heating mechanism is provided inside the furnace body, and grooves for placing the combustion tube are provided at both ends of the furnace.

[0009] In a preferred embodiment of the utility model, the heating mechanism includes a support tube fixedly installed inside the furnace, and the support tube is evenly wound with heating wires.

[0010] In a preferred embodiment of the utility model, a telescopic mechanism is provided on one side of the two shells, and a self-locking mechanism for fixing the relative positions of the two shells is provided on the other side, and both ends of the telescopic mechanism are respectively rotatably connected to the two shells.

[0011] In a preferred embodiment of the utility model, the self-locking mechanism includes a supporting plate and a supporting rod that cooperate with each other, and one end of the supporting plate is rotatably mounted on one of the housings, and the supporting rod is fixedly mounted on the other housing;

[0012] The support plate is provided with a guide groove, and one end of the guide groove close to the support rod is connected with an upward clamping groove, the angle between the clamping groove and the guide groove is less than 90 degrees, and the support rod is slidably embedded in the guide groove and the clamping groove.

[0013] In a preferred embodiment of the utility model, the combustion tube comprises a tube body, two ends of the tube body are respectively connected with a tube head and a tube tail, and the tube head is also connected to the air supply system.

[0014] In a preferred embodiment of the utility model, one end of the tube head is connected with a detection port and a feeding port, the detection port and the feeding port are parallel to the axis of the tube body, and the tube head is also provided with an air inlet for connecting to the air supply system.

[0015] In a preferred embodiment of the utility model, the gas supply system includes a gas cylinder storing compressed air, the gas cylinder is connected to the air inlet through a pipeline, and a valve and a flow meter are also provided on the pipeline. Beneficial Effects

[0016] (1) In the present invention, a heat-insulating layer is added between the furnace body and the outer shell so that during the heating process of the combustion tube, the temperature inside the furnace can be blocked to prevent the temperature from being lost too quickly. In addition, the furnace body and the outer shell can be separated by a heat-insulating component to prevent the outer shell from being deformed due to heat.

[0017] (2) In the utility model, the telescopic mechanism can be used to realize the automatic opening and closing of the upper and lower parts of the heating furnace, saving manpower, and the self-locking mechanism can be used to fix the relative positions of the two shells after they are opened, preventing the upper shell from accidentally falling due to its own weight after the telescopic mechanism fails, thereby avoiding safety accidents and improving the safety of the device.

[0018] (3) With regard to the above-mentioned self-locking mechanism, during the opening and closing process of the heating furnace, the support rod slides along the guide groove. When the heating furnace is opened to a certain angle, the support rod is located at the end of the guide groove and then slides into the slot to be fixed. At this time, the support plate acts as a two-force rod to prevent the heating furnace from closing accidentally. The mechanical self-locking structure can greatly improve the safety performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model with a combustion tube;

[0020] Figure 2 It is a schematic diagram of the structure of the utility model without the combustion tube;

[0021] Figure 3 It is a schematic diagram of the internal structure of the utility model;

[0022] Figure 4 It is a side view structural schematic diagram of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the self-locking mechanism of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the gas supply system of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the combustion tube of the utility model;

[0026] Figure 8 It is a schematic diagram of the structure of the utility model for testing;

[0027] Among them, 1. outer shell; 2. furnace body; 21. groove; 3. heating mechanism; 41. box body; 42. thermal insulation component; 5. telescopic mechanism; 6. self-locking mechanism; 61. support plate; 62. guide groove; 63. slot; 64. support rod; 8. combustion tube; 81. tube body; 82. tube head; 821. air inlet; 822. detection port; 823. feeding port; 83. tube tail; 9. gas supply system; 91. gas storage bottle; 92. valve; 93. flow meter. DETAILED DESCRIPTION

[0028] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention. Embodiment 1

[0029] like Figure 1-2 As shown, a tubular heating furnace device includes two oppositely arranged shells 1 and a base for supporting the two shells 1, a furnace body 2 is embedded on the opposite sides of the two shells 1, a combustion tube 8 for sample combustion is penetrated on one side of the furnace body 2, and a heating mechanism 3 for heating the combustion tube 8 is arranged inside the furnace body 2.

[0030] The two shells 1 are rotatably connected via a hinge structure, so that the two shells 1 can be flipped longitudinally to realize the opening and closing of the heating furnace device, thereby facilitating the placement of the combustion tube 8 and the maintenance of the internal components of the heating furnace device.

[0031] The effective length of the furnace body should be 480mm-620mm, its inner diameter should be 38mm-62mm, and it is equipped with an adjustable electric heating system; a furnace for installing the heating mechanism 3 is provided inside the furnace body 2, and grooves 21 for placing the combustion tube 8 are provided at both ends of the furnace body. The grooves 21 are provided on the furnace body 2, at both ends of the furnace body, and the function of the grooves 21 here is to avoid and position, so as to avoid interference between the furnace body 2 and the combustion tube 8 when the heating furnace is closed, and ensure that the heating mechanism 3 in the furnace body can fully heat the combustion tube 8 on the basis of convenient installation.

[0032] The base is provided with an electric control box and an electric control system. The electric control system is controlled by PLC software to make the temperature of the heating furnace rise at a uniform speed. The sample is the sample to be burned and tested. Here, the sample is a mixture taken from a cable or optical cable structure. The sample is placed in a combustion tube 8, which is located between two heating mechanisms 3. Under the baking of the heating mechanism 3, the temperature in the combustion tube 8 rises, the sample is ignited, and the combustion is completed, and then the next step of detection and processing is carried out.

[0033] As mentioned above, the heating mechanism 3 includes a support tube fixedly installed inside the furnace, and a heating wire is evenly wound on the support tube. The support tube is preferably a ceramic tube, and the heating wire is evenly wound on the ceramic tube. The power of the heating wire is about 3.4kW; when the heating wire is powered on, it converts electrical energy into heat energy to heat the combustion tube 8.

[0034] The furnace body 2 is formed by ceramic fiber through mold opening, and 12 ceramic tubes with a diameter of 25 mm are installed inside the furnace body 2, and each ceramic tube is evenly surrounded by a heating wire.

[0035] like Figure 3 As shown, a thermal insulation layer is provided on the outer side of the furnace body 2 , and the thermal insulation layer is located between the furnace body 2 and the outer shell 1 ; the thermal insulation layer includes a box body 41 for containing the furnace body 2 , and a thermal insulation component 42 is provided between the box body 41 and the furnace body 2 .

[0036] As mentioned above, the box body 41 is made of stainless steel, and the heat insulation component 42 is made of thermal insulation cotton. On the outside of the furnace body 2, a box body 41 is made of stainless steel. The size of the box body 41 is 40mm±5mm higher than the length, width and height of the furnace body 2. After the furnace body 2 is placed in the box body 41, it is evenly filled with thermal insulation cotton to ensure that it is tight enough.

[0037] By adding a thermal insulation layer between the furnace body 2 and the outer shell 1, the temperature in the furnace can be blocked during the heating process of the combustion tube 8 to avoid excessive temperature loss, and the furnace body 2 and the outer shell 1 can be separated by the insulation component 42 to prevent the outer shell 1 from overheating and deformation.

[0038] like Figure 1-Figure 2 , Figure 4-Figure 5 As shown, a telescopic mechanism 5 is provided on one side of the two housings 1 , and a self-locking mechanism 6 for fixing the relative positions of the two housings 1 is provided on the other side, and both ends of the telescopic mechanism 5 are rotatably connected to the two housings 1 respectively.

[0039] As mentioned above, the telescopic mechanism 5 preferably adopts a cylinder, which can be used to realize the automatic opening and closing of the upper and lower parts of the heating furnace, and the self-locking mechanism 6 can be used to fix the relative position of the two shells 1 after opening, to prevent the shell 1 located on the upper side from accidentally falling due to its own weight after the telescopic mechanism 5 fails, to avoid safety accidents, and to improve the safety of the device.

[0040] As mentioned above, the self-locking mechanism 6 includes a supporting plate 61 and a supporting rod 64 that cooperate with each other, and one end of the supporting plate 61 is rotatably mounted on one of the shells 1, and the supporting rod 64 is fixedly mounted on the other shell 1; a guide groove 62 is provided on the supporting plate 61, and an end of the guide groove 62 close to the supporting rod 64 is connected to an upward card groove 63, the angle between the card groove 63 and the guide groove 62 is less than 90 degrees, and the supporting rod 64 is slidably embedded in the guide groove 62 and the card groove 63.

[0041] When the two shells 1 of the heating furnace are opening and closing, the support rod 64 slides along the guide groove 62. When the heating furnace is opened to a certain angle, the support rod 64 is located at the end of the guide groove 62 and then slides into the card slot 63 for fixation. At this time, the support plate 61 acts as a two-force rod to prevent the heating furnace from closing accidentally. The mechanical self-locking structure can greatly improve the safety performance of the device.

[0042] Among them, the guide groove 62 is connected to the card slot 63, and there is an acute angle between the two; when the heating furnace is opened to the maximum angle, the support rod 64 bypasses the end of the guide groove 62 and can reach the card slot 63. Due to the direction and structure of the card slot 63, the weight of the outer shell 1 located above acts on the support rod 64 through the support plate 61, realizing mechanical self-locking.

[0043] like Figure 6-Figure 7 As shown, the combustion tube 8 includes a tube body 81 , and two ends of the tube body 81 are respectively connected to a tube head 82 and a tube tail 83 , and the tube head 82 is also connected to the air supply system 9 .

[0044] The combustion tube 8 is made of a quartz glass tube, and its inner diameter should be 30mm-46mm; the length of the combustion tube 8 extending from the inlet side of the tubular furnace should be 60mm-200mm, and the length extending from the outlet side should be 60mm-100mm; and an initial gap should be left for thermal expansion; the length of the combustion tube 8 extending should be the length of a section of the tube with a substantially unchanged diameter; before each sample, the entire combustion tube 8 should be calcined at a temperature of about 950°C to achieve the purpose of cleaning.

[0045] One end of the tube head 82 is connected with a detection port 822 and a feeding port 823, which are parallel to the axis of the tube body 81, and the tube head 82 is also provided with an air inlet 821 for connecting to the air supply system 9. The detection port 822 can be used for a temperature measuring device such as a thermocouple to extend into the combustion tube 8 to detect the temperature change inside the combustion tube 8; the feeding port 823 is used to feed the sample to be burned into the combustion tube 8 for heating and combustion.

[0046] The gas supply system 9 includes a gas cylinder 91 storing compressed air. The gas cylinder 91 is connected to the air inlet 821 through a pipeline, and a valve 92 and a flow meter 93 are also provided on the pipeline.

[0047] As mentioned above, the gas used for combustion should be air. The gas cylinder 91 that can provide high-purity air is adjusted and controlled by the valve 92 (pressure reducing valve and needle valve), and the air flow rate is controlled within an appropriate range by the flow meter 93.

[0048] The gas supply system 9 can be selected by the following methods:

[0049] (1) When using artificial air or bottled compressed air, the air should be injected from the tube head 82 of the combustion tube 8, that is, from the beginning of the quartz glass tube;

[0050] (2) Use compressed air provided by the laboratory. The air should be filtered and dried and should be injected from the beginning of the quartz glass tube;

[0051] (3) When using laboratory ambient air, the air should be filtered and dried. In this case, the mixture of air and combustion gas should be sucked out by a pump.

[0052] Working principle:

[0053] With the support of the base, the telescopic mechanism 5 can be used to ensure that the upper and lower shells 1 of the heating furnace device can be automatically opened and closed; when working, the two shells 1 are in a closed state, and the combustion tube 8 passes through the two furnace bodies 2 inside the device. When the heating wire is energized, it will convert electrical energy into thermal energy to heat the combustion tube 8 in the furnace, thereby heating the internal sample and causing the sample to burn. The gas generated by the combustion will be passed from the other end of the combustion tube 8 to the corresponding detection device for detection; and in this process, the temperature in the furnace can be blocked by adding a thermal insulation layer between the furnace body 2 and the shell 1 to avoid excessive temperature loss, and the furnace body 2 and the shell 1 can be separated by the thermal insulation component 42 to prevent the shell 1 from overheating and deformation. Embodiment 2

[0054] like Figure 8 As shown, based on the first embodiment, a device for detecting the composition of combustion gas is connected to one end of the pipe tail 83, which includes corresponding washing bottles, empty bottles, and volumetric bottles.

[0055] Test steps:

[0056] (1) Place the empty combustion boat in the combustion tube 8 of the tube furnace and place it in the center of the tube furnace; use a needle valve to adjust the air flow to the specified value and keep it constant during the test. Place a thermocouple or other appropriate temperature measuring device at the sample point in the empty combustion boat, and then increase the temperature evenly within 40±5 minutes, and maintain the temperature at 800℃±10℃ for 20±1 minutes. The heating method developed by the above procedure can ensure that the required sample heating rate and temperature are achieved during the test.

[0057] (2) After the above heating procedure is completed, all washed bottles and empty bottles should be disassembled and the contents should be poured into a 1000ml volumetric flask. The empty bottles, washed bottles, connecting tubes, the end caps of the cooled combustion tube 8 and the quartz wool plugs should be rinsed with distilled water or deionized water. The rinse liquid should also be poured into the volumetric flask and added to the 1000ml mark.

[0058] (3) Through the blank combustion boat test and the combustion boat test after placing the sample, the volume of 0.1 mol / L ammonium thiocyanate solution used for the blank test and the volume of 0.1 mol / L ammonium thiocyanate solution consumed in the sample test were recorded respectively. Finally, the test results were obtained using the calculation formula for the halogen acid gas content.

[0059] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A tubular heating furnace device, characterized in that: It comprises two shells (1) arranged opposite to each other and capable of being turned over and opened and closed in the longitudinal direction, a furnace body (2) being embedded in one side of the two shells (1) opposite to each other, a combustion tube (8) for burning a sample being penetrated through one side of the furnace body (2), and a heating mechanism (3) for heating the combustion tube (8) being arranged inside the furnace body (2); A heat-insulating layer is provided on the outside of the furnace body (2), and the heat-insulating layer is located between the furnace body (2) and the outer shell (1); the heat-insulating layer comprises a box body (41) for containing the furnace body (2), and a heat-insulating component (42) is provided between the box body (41) and the furnace body (2).

2. The tubular heating furnace device according to claim 1, characterized in that: A furnace for installing the heating mechanism (3) is provided inside the furnace body (2), and grooves (21) for placing the combustion tube (8) are provided at both ends of the furnace.

3. The tubular heating furnace device according to claim 2, characterized in that: The heating mechanism (3) comprises a support tube fixedly mounted inside the furnace, and a heating wire is evenly wound around the support tube.

4. The tubular heating furnace device according to claim 1, characterized in that: A telescopic mechanism (5) is provided on one side of the two shells (1), and a self-locking mechanism (6) for fixing the relative positions of the two shells (1) is provided on the other side, and both ends of the telescopic mechanism (5) are respectively rotatably connected to the two shells (1).

5. The tubular heating furnace device according to claim 4, characterized in that: The self-locking mechanism (6) comprises a supporting plate (61) and a supporting rod (64) that cooperate with each other, and one end of the supporting plate (61) is rotatably mounted on one of the housings (1), and the supporting rod (64) is fixedly mounted on the other housing (1); The support plate (61) is provided with a guide groove (62), and one end of the guide groove (62) close to the support rod (64) is connected to an upward clamping groove (63), the included angle between the clamping groove (63) and the guide groove (62) is less than 90 degrees, and the support rod (64) is slidably embedded in the guide groove (62) and the clamping groove (63).

6. The tubular heating furnace device according to claim 1, characterized in that: The combustion tube (8) comprises a tube body (81), and two ends of the tube body (81) are respectively connected to a tube head (82) and a tube tail (83), and the tube head (82) is also connected to the gas supply system (9).

7. The tubular heating furnace device according to claim 6, characterized in that: One end of the tube head (82) is connected to a detection port (822) and a feeding port (823); the detection port (822) and the feeding port (823) are parallel to the axis of the tube body (81); and the tube head (82) is also provided with an air inlet (821) for connecting to the air supply system (9).

8. The tubular heating furnace device according to claim 7, characterized in that: The gas supply system (9) comprises a gas storage bottle (91) storing compressed air, the gas storage bottle (91) being connected to the gas inlet (821) via a pipeline, and a valve (92) and a flow meter (93) are also provided on the pipeline.

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