A special exhaust purification device above the muffle furnace

Abstract

The present invention relates to a special exhaust purification device above a muffle furnace, belonging to the technical field of exhaust purification equipment. The device includes a curved exhaust hood, a convergent pipe, a first exhaust duct, an activated carbon purification device, a fan, and a second exhaust duct, wherein: an arc-shaped guide plate is provided inside the inlet end of the curved exhaust hood; the outlet end of the curved exhaust hood is fixedly connected to the first exhaust duct via the convergent pipe, the outlet end of the first exhaust duct is fixedly connected to the activated carbon purification device, the outlet end of the activated carbon purification device is sequentially connected to the fan and the second exhaust duct, and the outlet end of the second exhaust duct extends outdoors. Harmful gases and smoke generated by the muffle furnace enter through the curved exhaust hood, are sequentially transported to the activated carbon purification device through the convergent pipe, the air volume regulating valve, and the first exhaust duct for adsorption purification, and the purified exhaust gas is sequentially discharged outdoors through the fan and the second exhaust duct. The device provided by the present invention can effectively collect and purify harmful gases and smoke generated during the operation of the muffle furnace.

Description

Technical Field

[0001] The invention belongs to the technical field of exhaust purification equipment, and in particular relates to a special exhaust purification device above a muffle furnace. Background Art

[0002] When the laboratory muffle furnace is in operation, harmful gases and smoke are generated due to high-temperature heating, ashing and other processes, and diffuse into the experimental site through the entrance of the muffle furnace. If they cannot be effectively eliminated, the smoke alarm will sound, and it will affect the laboratory environment and the health of the experimenters.

[0003] Most domestic laboratories have muffle furnace rooms equipped with axial flow fans for comprehensive exhaust. However, conventional comprehensive exhaust cannot quickly and effectively remove the instantaneous pollution generated when the muffle furnace door is opened, nor can it quickly remove the harmful substances emitted from the muffle furnace door gap. It can only slowly remove the harmful substances through fresh air replacement. Therefore, there is an urgent need to realize an exhaust device that can quickly remove the harmful substances generated when the muffle furnace is in operation and when the door is opened, so as to solve the problem of the diffusion of harmful substances generated by the muffle furnace. Summary of the Invention

[0004] In order to solve the defects of the prior art, the purpose of the present invention is to provide a special exhaust purification device above the muffle furnace, which can effectively collect and purify the harmful gases and smoke generated when the muffle furnace is in operation.

[0005] In order to achieve the above purpose, a technical solution adopted by the present invention is:

[0006] A special exhaust purification device above a muffle furnace includes a curved exhaust hood, a tapered pipe, a first exhaust duct, an activated carbon purification device, a fan, and a second exhaust duct, wherein:

[0007] An arc-shaped guide plate is provided inside the inlet end of the arc-shaped exhaust hood; the outlet end of the arc-shaped exhaust hood is fixedly connected to the first exhaust duct through the tapered tube, the outlet end of the first exhaust duct is fixedly connected to the activated carbon purification device, the outlet end of the activated carbon purification device is connected to the fan and the second exhaust duct in sequence, and the outlet end of the second exhaust duct extends outdoors.

[0008] Furthermore, in the special exhaust purification device above the muffle furnace as described above, the curved exhaust hood is a semicircular 90° exhaust hood, and its inlet end is open downward; the length of the curved exhaust hood is consistent with the side length of the muffle furnace opening, the width range is 100mm~200mm, and the height range is 100mm~200mm and is consistent with its width dimension.

[0009] Furthermore, in the special exhaust purification device above the muffle furnace as described above, the arc guide plates are 90° arc guide plates, and the number is not less than three, wherein the spacing between the arc guide plates on both sides is greater than the spacing between the arc guide plates in the middle, and the specific spacing size is determined based on the results of fluid numerical simulation.

[0010] Furthermore, as described above, the dedicated exhaust purification device above the muffle furnace, the tapered tube is fixed above the muffle furnace, and its side length gradually decreases from the end close to the curved exhaust hood to the end close to the first exhaust duct, and its maximum side length is consistent with the side length of the muffle furnace opening, and the height range is 100mm~200mm and is consistent with the curved exhaust hood.

[0011] Furthermore, in the above-mentioned dedicated exhaust purification device above the muffle furnace, the tapered pipe is a square tapered pipe with a tapering angle of 60° to 90°.

[0012] Furthermore, in the above-mentioned dedicated exhaust purification device above the muffle furnace, the first exhaust duct is a circular duct with a diameter of 100mm~200mm and is consistent in height with the tapered pipe.

[0013] Furthermore, in the above-mentioned dedicated exhaust purification device above the muffle furnace, an air volume regulating valve is provided at the front end of the first exhaust duct for regulating the air volume in the duct; a sealing gasket is provided at the connection between the air volume regulating valve and the first exhaust duct.

[0014] Furthermore, in the dedicated exhaust purification device above the muffle furnace as described above, the inlet end of the activated carbon purification device is a circular inlet with a size of 100mm~200mm and is consistent with the size of the first exhaust duct, and its outlet end size is consistent with its inlet end size; the inlet size of the fan is consistent with the outlet end size of the activated carbon purification device.

[0015] Furthermore, in the dedicated exhaust purification device above the muffle furnace as described above, the air volume processed by the activated carbon purification device is consistent with the calculated exhaust volume of the arc-shaped exhaust hood; the exhaust volume of the fan is consistent with the air volume processed by the activated carbon purification device.

[0016] Furthermore, as described above, the dedicated exhaust purification device above the muffle furnace is provided with flanges and sealing gaskets for sealing at the connection between the outlet end of the tapered tube and the inlet end of the first exhaust duct, the connection between the outlet end of the first exhaust duct and the inlet end of the activated carbon purification device, the connection between the outlet end of the activated carbon purification device and the inlet end of the fan, and the connection between the outlet end of the fan and the inlet end of the second exhaust duct.

[0017] The use of the special exhaust purification device above the muffle furnace of the present invention has the following significant technical effects:

[0018] (1) The structure composed of the arc-shaped exhaust hood and the arc-shaped guide plate is used to achieve uniform exhaust at the exhaust hood opening, with an average wind speed of not less than 4m / s. The wind speed at the muffle furnace control point is controlled to be not less than 1m / s by adjusting the air volume, which can quickly and effectively remove the harmful gases and smoke generated by the muffle furnace;

[0019] (2) A smaller air volume can be used to effectively exhaust harmful gases and smoke generated by the muffle furnace, greatly saving energy;

[0020] (3) The exhaust hood matches the size of the muffle furnace and can be directly installed on the muffle furnace, which is quick and convenient; the whole device occupies a small area and is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural front view of a special exhaust purification device above a muffle furnace provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A top view of the structure of the device;

[0023] Figure 3 for Figure 1 A structural perspective view of the device;

[0024] Figure 4 is the numerical simulation result of the flow field;

[0025] In the figure: 1- curved exhaust hood, 2- curved guide plate, 3- tapering pipe, 4- air volume regulating valve, 5- first exhaust duct, 6- activated carbon purification device, 7- fan, 8- second exhaust duct. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to specific embodiments and the accompanying drawings.

[0027] In order to solve the problem of diffusion of harmful gases and smoke generated during the operation of laboratory muffle furnace, the present invention provides a special exhaust purification device above the muffle furnace. Figure 1-Figure 3The following are the front, top, and perspective views of the device, respectively. The device comprises a curved exhaust hood 1, a curved guide plate 2, a tapered pipe 3, a first exhaust duct 5, an activated carbon purification device 6, a fan 7, and a second exhaust duct 8. The curved guide plate 2 is disposed within the inlet of the curved exhaust hood 1, the outlet of the curved exhaust hood 1 is fixedly connected to the inlet of the first exhaust duct 5 via the tapered pipe 3, the outlet of the first exhaust duct 5 is fixedly connected to the inlet of the activated carbon purification device 6, the outlet of the activated carbon purification device 6 is sequentially connected to the fan 7 and the second exhaust duct 8, and the outlet of the second exhaust duct 8 extends outdoors. Harmful gases and smoke generated by the muffle furnace enter through the curved exhaust hood 1, are transported to the activated carbon purification device 6 for adsorption purification via the tapered pipe 3, the air volume regulating valve 4, and the first exhaust duct 5, and the purified exhaust is discharged outdoors via the fan 7 and the second exhaust duct 8.

[0028] The curved exhaust hood 1 is a semicircular 90° exhaust hood. The inlet end of the curved exhaust hood 1 is the inlet for harmful substances. The exhaust hood opening faces downward. The length of the curved exhaust hood is consistent with the side length of the muffle furnace opening. The width of the curved exhaust hood is 100mm~200mm. The height of the curved exhaust hood is 100mm~200mm and is consistent with the width of the exhaust hood.

[0029] The arc-shaped guide plate 2 is fixedly arranged in the arc-shaped exhaust hood 1, so that the wind speed at the outlet of the arc-shaped exhaust hood 1 is uniform, and the average wind speed is not less than 4m / s. In this embodiment, the arc-shaped guide plate 2 is a 90° arc-shaped guide plate, and the number of guide plates is not less than 3. The distance between the guide plates on both sides is larger, and the distance between the guide plates in the middle is smaller. The specific size is obtained from the Fluent numerical simulation results. For example, when the size of the hood opening of the arc-shaped exhaust hood 1 is 200mm, three arc-shaped guide plates 2 are set, and the thickness of the arc-shaped guide plates is 1mm, it is obtained from the numerical simulation results that when the wind speed is uniform, the distance between the arc-shaped guide plates 2 from bottom to top is 61mm, 35mm, 40mm, and 60mm respectively. The numerical simulation results of the flow field are as follows. Figure 4 shown.

[0030] The reducer 3 is fixedly connected to the outlet end of the curved exhaust hood 1 and secured above the muffle furnace. Its maximum side length matches the length of the muffle furnace opening, and its height is 100-200 mm, consistent with the height of the curved exhaust hood 1. In this embodiment, the reducer 3 is a square reducer with a taper angle of 60°-90°.

[0031] The inlet end of the first exhaust duct 5 is fixedly connected to the outlet end of the reducer 3, and a flange and a sealing gasket are provided at the connection. In this embodiment, the first exhaust duct 5 is a circular duct with a diameter of 100mm-200mm and is consistent in height with the reducer 3.

[0032] The inlet end of the first exhaust duct 5 is provided with an air volume regulating valve 4, which can regulate the air volume in the duct. The connection between the air volume regulating valve 4 and the first exhaust duct 5 is sealed with a sealing gasket.

[0033] The inlet of the activated carbon purification device 6 is connected to the outlet of the first exhaust duct 5, with a flange and gasket sealing the connection. The dimensions of the outlet of the activated carbon purification device 6 are consistent with those of its inlet. In this embodiment, the inlet of the activated carbon purification device 6 is circular, measuring 100-200 mm, and consistent with the dimensions of the first exhaust duct 5. The air volume processed by the activated carbon purification device 6 is consistent with the calculated exhaust volume of the curved exhaust hood 1.

[0034] The inlet end of the fan 7 is connected to the outlet end of the activated carbon purification device 6, and the connection is sealed with a flange and a sealing gasket. The size of the inlet end of the fan 7 is consistent with the size of the outlet end of the activated carbon purification device 6, and its exhaust volume is consistent with the air volume processed by the activated carbon purification device 6.

[0035] The outlet end of the fan 7 is connected to the inlet end of the second exhaust duct 8, and the connection is provided with a flange and a sealing gasket for sealing. The outlet end of the second exhaust duct 8 extends outdoors.

[0036] The special exhaust purification device above the muffle furnace provided by the present invention can achieve a uniform wind speed at the hood opening of not less than 4 m / s by arranging a guide plate at the exhaust hood opening, and the wind speed at each control point of the muffle furnace is not less than 1 m / s, so that the exhaust purification device can effectively collect harmful gases and smoke generated during the operation of the muffle furnace and discharge them outdoors after purification; sealing gaskets are provided at the connection points of each point of the exhaust purification device to prevent leakage of harmful substances, thereby ultimately solving the diffusion problem of harmful substances generated by the muffle furnace.

[0037] The above embodiments are merely illustrative of the present invention, and the present invention may also be implemented in other specific ways or in other specific forms without departing from the gist or essential characteristics of the present invention. Therefore, the described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is to be determined by the appended claims, and any variations equivalent to the intent and scope of the claims are intended to be within the scope of the present invention.

Claims

1. A special exhaust purification device above a muffle furnace, characterized in that: The device comprises an arc-shaped exhaust hood (1), a tapered pipe (3), a first exhaust duct (5), an activated carbon purification device (6), a fan (7) and a second exhaust duct (8), wherein: An arc-shaped guide plate (2) is provided inside the inlet end of the arc-shaped exhaust hood (1); the outlet end of the arc-shaped exhaust hood (1) is fixedly connected to the first exhaust duct (5) through the convergent tube (3); the outlet end of the first exhaust duct (5) is fixedly connected to the activated carbon purification device (6); the outlet end of the activated carbon purification device (6) is connected to the fan (7) and the second exhaust duct (8) in sequence; the outlet end of the second exhaust duct extends outdoors; The arc-shaped exhaust hood (1) is a semicircular 90° exhaust hood, with its inlet opening facing downward; the length of the arc-shaped exhaust hood (1) is consistent with the length of the side of the muffle furnace opening, the width range is 100mm~200mm, and the height range is 100mm~200mm and consistent with its width; The arc-shaped guide plates (2) are 90° arc-shaped guide plates, and the number thereof is not less than three, wherein the spacing between the arc-shaped guide plates (2) on both sides is greater than the spacing between the arc-shaped guide plates (2) in the middle, and the specific spacing size is determined according to the results of fluid numerical simulation; The tapered tube (3) is fixed above the muffle furnace, and its side length gradually decreases from the end close to the arc-shaped exhaust hood (1) to the end close to the first exhaust duct (5), and its maximum side length is consistent with the side length of the muffle furnace opening. The height range is 100 mm to 200 mm, and is consistent with the height range of the arc-shaped exhaust hood (1); The first exhaust duct (5) is a circular duct with a diameter of 100 mm to 200 mm and is in the same height as the tapered pipe (3); an air volume regulating valve (4) is provided at the front end of the first exhaust duct (5) for regulating the air volume in the duct; a sealing gasket is provided at the connection between the air volume regulating valve (4) and the first exhaust duct (5).

2. The dedicated exhaust purification device above the muffle furnace according to claim 1, characterized in that: The reducer (3) is a square reducer with a reduction angle of 60° to 90°.

3. The dedicated exhaust purification device above the muffle furnace according to claim 1, characterized in that: The inlet end of the activated carbon purification device (6) is a circular inlet with a size of 100 mm to 200 mm and is consistent with the size of the first exhaust duct (5), and the size of its outlet end is consistent with the size of its inlet end; the inlet size of the fan (7) is consistent with the size of the outlet end of the activated carbon purification device (6).

4. The dedicated exhaust purification device above the muffle furnace according to claim 3, characterized in that: The air volume processed by the activated carbon purification device (6) is consistent with the calculated exhaust volume of the arc-shaped exhaust hood (1); the exhaust volume of the fan (7) is consistent with the air volume processed by the activated carbon purification device (6).

5. The dedicated exhaust purification device above the muffle furnace according to claim 4, characterized in that: The connection between the outlet end of the tapered pipe (3) and the inlet end of the first exhaust duct (5), the connection between the outlet end of the first exhaust duct (5) and the inlet end of the activated carbon purification device (6), the connection between the outlet end of the activated carbon purification device (6) and the inlet end of the fan (7), and the connection between the outlet end of the fan (7) and the inlet end of the second exhaust duct (8) are all provided with flanges and sealing gaskets.

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