Nitrogen vacuum dryer with suction filtration and back flushing functions

Abstract

The invention discloses a nitrogen vacuum dryer with suction filtration and back flushing functions, which belongs to the technical field of drying equipment and comprises an outer barrel and a sealing cover which are mounted on an inner barrel, and a heating cavity for containing water is arranged between the inner barrel and the outer barrel. A water injection pipe and a water drainage pipe are installed on the outer cylinder and connected with the heating cavity. A plurality of supporting columns are installed on the bottom face of the outer cylinder. According to the nitrogen vacuum drying machine with the suction filtration and back flushing functions, the heating cavity and the multiple heating pipes are arranged, water in the heating cavity is heated through the heating pipes, then the water serves as a heat conduction medium, materials are evenly heated through the inner cylinder, the local temperature difference can be rapidly eliminated, and the heat conduction efficiency is improved. The problem of local overheating or underheating caused by direct heating of the heating pipe is avoided, and the drying quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of drying equipment, and particularly relates to a nitrogen vacuum dryer with a suction filtration and backwashing function. Background Art

[0002] In the fields of industrial production and scientific research, drying technology, as a key step in material processing, has witnessed a profound transformation from traditional natural drying to highly efficient mechanized drying. In particular, vacuum drying technology, with its ability to achieve efficient water removal at relatively low temperatures, has become the preferred method for drying heat-sensitive materials, easily oxidizable materials, and high-value-added products. As an important branch of vacuum drying technology, nitrogen vacuum drying technology not only creates an anaerobic or low-oxygen drying environment by filling nitrogen into the drying chamber, effectively preventing the oxidation and deterioration of materials during the drying process, but also utilizes the inert characteristics of nitrogen to improve the safety of the drying process. With the progress of nitrogen preparation technology and the reduction of costs, nitrogen vacuum drying technology has been widely applied in multiple industries such as chemical engineering, pharmaceuticals, and food, and has gradually become one of the mainstream technologies in the high-end drying market.

[0003] Although nitrogen vacuum drying technology performs well in many aspects, traditional nitrogen vacuum dryers still have the following deficiencies: First, traditional nitrogen vacuum dryers mostly adopt the method of directly heating the drying chamber with heating tubes. This method often has the problem of uneven heating, which easily leads to local overheating or underheating, thereby affecting the drying quality and the physical and chemical properties of the materials. Second, the pipeline for evacuating the drying chamber of traditional nitrogen vacuum dryers is fixed, and it is not conducive to air passing through the interior of the materials, resulting in a relatively large resistance when the vacuum pump evacuates. Third, traditional nitrogen vacuum dryers directly discharge the waste gas generated during the drying process. However, since there are some small particle materials remaining in the waste gas, the direct discharge of the waste gas will cause material waste and environmental pollution. Summary of the Invention

[0004] The purpose of the present invention is to provide a nitrogen vacuum dryer with a suction filtration and backwashing function, which is used to solve the technical problems in the prior art that traditional nitrogen vacuum dryers mostly adopt the method of directly heating the drying chamber with heating tubes. Although this method is simple to operate, it often has the problem of uneven heating, which easily leads to local overheating or underheating, thereby affecting the drying quality and the physical and chemical properties of the materials; the pipeline for evacuating the drying chamber of traditional nitrogen vacuum dryers is fixed, and it is not conducive to air passing through the interior of the materials, resulting in a relatively large resistance when the vacuum pump evacuates; traditional nitrogen vacuum dryers directly discharge the waste gas generated during the drying process. However, since there are some small particle materials remaining in the waste gas, the direct discharge of the waste gas will cause material waste and environmental pollution.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A nitrogen vacuum dryer with a suction filtration and backwashing function, comprising an outer cylinder and a sealing cover installed on an inner cylinder. A heating chamber for containing water is provided between the inner cylinder and the outer cylinder. It further includes: a plurality of heating tubes, all installed in the heating chamber; a horizontal tube, rotatably connected to the inner cylinder and the outer cylinder, and a plurality of vertical tubes with through holes are installed on the horizontal tube; a steam discharge mechanism, installed on the outer cylinder and communicated with the heating chamber; a suction filtration mechanism for pumping out the gas in the inner cylinder, which includes: a filtration box, with a filter plate installed inside; a vacuum pump, installed on the top surface of the filtration box, its suction pipe is rotatably connected to the horizontal tube, and its discharge pipe extends into the filtration box; a driving mechanism for driving the plurality of vertical tubes to swing back and forth by the steam discharged by the steam discharge mechanism and cleaning the filter plate; a nitrogen backwashing mechanism for conveying nitrogen into the inner cylinder through the horizontal tube and the vertical tubes.

[0006] Preferably, the steam discharge mechanism includes: an exhaust pipe, installed on the outer cylinder; a pressure relief valve, installed on the exhaust pipe.

[0007] Preferably, the driving mechanism includes: a cross bar, rotatably connected to the exhaust pipe; a first fan blade, located inside the exhaust pipe and installed on the cross bar; an incomplete gear, installed at the lower end of the cross bar; a moving plate, with a rectangular through slot formed therethrough, and two first toothed plates meshing with the incomplete gear are installed in the rectangular through slot, and a second toothed plate is installed on the bottom surface of the moving plate; a toothed ring, fixedly sleeved on the horizontal tube and meshing with the second toothed plate.

[0008] Preferably, the driving mechanism further includes: a reciprocating lead screw, rotatably installed on the filtration box, and its upper end is fixedly connected to the incomplete gear; a lead screw nut, sleeved on the reciprocating lead screw; a cleaning brush, slidably connected to the inner wall of the filtration box, fixedly connected to the lead screw nut and in contact with the filter plate.

[0009] Preferably, the suction filtration mechanism further includes: a plurality of exhaust holes, formed through the front and back of the filtration box; a box door, hinged to the filtration box; a protective box, installed on the filtration box, and the moving plate and the incomplete gear are both located inside the protective box.

[0010] Preferably, the driving mechanism further includes: two guide plates, both installed on the moving plate, both passing through one side of the protective box and slidably connected to the protective box.

[0011] Preferably, the nitrogen backwashing mechanism includes: a high-pressure gas tank; a connecting pipe, one end of which is fixedly connected to the high-pressure gas tank, the other end of which is rotatably connected to the horizontal tube, and a valve is installed on the connecting pipe; a gas pulse assembly, installed on the connecting pipe.

[0012] Preferably, the gas pulse assembly includes: a fixed disk fixedly installed in the connecting pipe, with a plurality of first ventilation holes penetrating therethrough; a rotating disk rotatably installed in the connecting pipe, with a plurality of second ventilation holes penetrating therethrough; a mounting frame fixedly installed in the connecting pipe; a rotating shaft rotatably installed on the mounting frame; and a second fan blade installed on the rotating shaft.

[0013] Preferably, the nitrogen vacuum dryer with a suction filtration and backwashing function further includes: a discharge pipe installed on the bottom surface of the inner cylinder and extending outside the outer cylinder, and a discharge valve is installed on the discharge pipe.

[0014] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. The nitrogen vacuum dryer with a suction filtration and backwashing function in the present invention is provided with a heating chamber and a plurality of heating tubes. The heating tubes heat the water in the heating chamber, and then use the water as a heat conduction medium to uniformly heat the inner cylinder and the materials, which can quickly eliminate local temperature differences, avoid the problems of local overheating or underheating caused by direct heating of the heating tubes, and improve the drying quality.

[0015] 2. The nitrogen vacuum dryer with a suction filtration and backwashing function in the present invention is provided with a steam discharge mechanism and a driving mechanism. When the steam discharge mechanism discharges the water vapor generated in the heating chamber, the driving mechanism will use the impact force of the water vapor to drive the vertical pipe to swing back and forth. The swinging of the vertical pipe agitates the materials, promotes the penetration of air inside the materials, reduces the flow resistance, and improves the drying efficiency. And when the steam discharge mechanism discharges the water vapor, it will also clean the filter plate through the driving mechanism, avoiding the blockage of the filter plate.

[0016] 3. The nitrogen backwashing mechanism in the present invention is provided with a gas pulse assembly. When nitrogen passes through the connecting pipe, it will blow the second fan blade to rotate, and then drive the rotating disk to rotate, so that the connecting pipe intermittently conveys nitrogen into the horizontal pipe, thereby increasing the impact force when entering the horizontal pipe and the vertical pipe, which is beneficial for the nitrogen with impact force to backwash the through holes, effectively avoiding the problem of material blockage of the through holes, and also improving the utilization efficiency of nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a three-dimensional view of the nitrogen vacuum dryer with a suction filtration and backwashing function in the present invention; Figure 2 Schematic diagram of the internal structures of the inner cylinder and the outer cylinder in the present invention; Figure 3 Schematic diagram of the internal structure of the exhaust pipe in the present invention; Figure 4 Schematic diagram of the assembly structure of the horizontal pipe filtration mechanism and the nitrogen back-blowing mechanism in the present invention; Figure 5 In the present invention Figure 4 Enlarged schematic diagram of part A; Figure 6 Schematic diagram of the internal structure of the filter box in the present invention; Figure 7 Schematic diagram of the assembly structure of the horizontal pipe and the driving mechanism in the present invention; Figure 8 Stereogram of the nitrogen back-blowing mechanism in the present invention; Reference numerals: 100, inner cylinder; 101, outer cylinder; 102, heating cavity; 103, heating pipe; 104, discharge pipe; 105, sealing cover; 111, horizontal pipe; 112, vertical pipe; 113, through hole; 120, steam discharge mechanism; 121, exhaust pipe; 122, pressure relief valve; 200, filtration mechanism; 201, filter box; 2011, exhaust hole; 202, support leg; 203, box door; 204, filter plate; 205, vacuum pump; 206, suction pipe; 207, protective box; 300, driving mechanism; 301, cross bar; 302, first fan blade; 303, incomplete gear; 304, moving plate; 3041, first toothed plate; 3042, second toothed plate; 3043, guide plate; 305, toothed ring; 306, reciprocating lead screw; 307, lead screw nut; 308, cleaning brush; 400, nitrogen back-blowing mechanism; 401, high-pressure gas tank; 402, connecting pipe; 403, valve; 404, fixed disk; 405, rotating disk; 406, second ventilation hole; 407, mounting bracket; 408, rotating shaft; 409, second fan blade. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1: As shown in Figure 1 and Figure 2As shown in the figure, a nitrogen vacuum dryer with a suction filtration and backwashing function includes an outer cylinder 101 and a sealing cover 105 installed on an inner cylinder 100. A heating chamber 102 for containing water is provided between the inner cylinder 100 and the outer cylinder 101. A water injection pipe and a drain pipe are installed on the outer cylinder 101, and both the water injection pipe and the drain pipe are connected to the heating chamber 102. A plurality of support columns are installed on the bottom surface of the outer cylinder 101.

[0021] The nitrogen vacuum dryer with a suction filtration and backwashing function further includes a plurality of heating tubes 103, a horizontal tube 111, a steam discharge mechanism 120, a suction filtration mechanism 200, a driving mechanism 300, and a nitrogen backwashing mechanism 400.

[0022] The plurality of heating tubes 103 are all installed in the heating chamber 102; the horizontal tube 111 is rotatably connected to the inner cylinder 100 and the outer cylinder 101, and a plurality of vertical tubes 112 having through holes 113 are installed on the horizontal tube 111; the steam discharge mechanism 120 is installed on the outer cylinder 101, and the steam discharge mechanism 120 is communicated with the heating chamber 102.

[0023] The suction filtration mechanism 200 is used to extract the gas in the inner cylinder 100. The suction filtration mechanism 200 includes a filtration box 201 and a vacuum pump 205: a filter plate 204 is installed inside the filtration box 201, and a plurality of support legs 202 are installed on the bottom surface of the filtration box 201. The vacuum pump 205 is installed on the top surface of the filtration box 201, the suction pipe 206 of the vacuum pump 205 is rotatably connected to the horizontal tube 111, and the discharge pipe of the vacuum pump 205 extends into the filtration box 201.

[0024] The driving mechanism 300 can utilize the steam discharged by the steam discharge mechanism 120 to drive the plurality of vertical tubes 112 to swing back and forth and clean the filter plate 204. The nitrogen backwashing mechanism 400 is used to convey nitrogen into the inner cylinder 100 through the horizontal tube 111 and the vertical tubes 112. A bottom plate is provided below the outer cylinder 101, and the support columns, the support legs 202, and the nitrogen backwashing mechanism 400 are all installed on the bottom plate.

[0025] Specifically, by connecting the steam discharge mechanism 120 to an external heat recovery device, adding the material to be dried into the inner cylinder 100, and then inserting the sealing cover 105 into the inner cylinder 100. Then, water is injected into the heating chamber 102.

[0026] Start the vacuum pump 205. The vacuum pump 205 extracts the air inside the inner cylinder 100 through the suction pipe 206, the horizontal pipe 111, and the vertical pipe 112, making the inside of the inner cylinder 100 in a vacuum state. Then, by starting multiple heating pipes 103, heat the water, and then heat the inner cylinder 100 and the materials inside the inner cylinder 100 through the water. Since the inside of the inner cylinder 100 is in a vacuum state, the boiling point of the water in the materials inside the inner cylinder 100 will decrease, and thus the moisture in the materials can be vaporized at a lower temperature, avoiding thermal damage to the materials caused by high temperatures. At the same time, the vacuum environment also reduces air resistance, enabling the water vapor on the surface of the materials to quickly diffuse and be extracted by the vacuum pump 205, accelerating the drying speed.

[0027] When the moisture in the materials evaporates to a certain extent, start the nitrogen back-blowing mechanism 400 to inject nitrogen into the inner cylinder 100 to displace the residual oxygen and moisture.

[0028] After drying is completed, turn off the vacuum pump 205 and the heating pipes 103, slowly inject nitrogen into the drying chamber to restore normal pressure inside the inner cylinder 100, and finally take out the dried materials.

[0029] Among them, when the heating pipes 103 heat the water in the heating chamber 102, the water will vaporize into water vapor, and the water vapor will enter the external heat recovery device from the steam discharge mechanism 120 for heat recovery. When the water vapor is discharged from the steam discharge mechanism 120, it will drive the multiple vertical pipes 112 to swing back and forth through the drive mechanism 300. By swinging the vertical pipes 112, the positions of the vertical pipes 112 can be periodically changed, which can stir the materials, promote the penetration of air inside the materials, and reduce the flow resistance.

[0030] Heating the inner cylinder 100 through water has the following advantages compared with directly heating the inner cylinder 100 by the heating pipes 103: The contact area between the water and the inner cylinder 100 is larger, and the local temperature difference can be quickly eliminated, making the circumferential temperature uniformity of the inner cylinder 100 reach within ±2°C. However, when directly heated by the heating pipes 103, local overheating or underheating is likely to occur due to uneven spacing and power distribution of the heating pipes 103.

[0031] As Figures 1 - 3 shown, the steam discharge mechanism 120 includes an exhaust pipe 121 and a pressure relief valve 122. The exhaust pipe 121 is installed on the outer cylinder 101; the pressure relief valve 122 is installed on the exhaust pipe 121, and the pressure relief valve 122 is an adjustable pressure relief valve 122.

[0032] Specifically, when the pressure inside the heating chamber 102 exceeds the preset pressure value of the pressure relief valve 122, the pressure relief valve 122 will open, allowing the water vapor inside the heating chamber 102 to be discharged through the exhaust pipe 121. And by setting the pressure relief valve 122, the water vapor discharged through the exhaust pipe 121 has a certain impact force, which can ensure that the drive mechanism 300 can operate.

[0033] As Figures 4 - 7 shown, the drive mechanism 300 includes a cross bar 301, a first fan blade 302, an incomplete gear 303, a moving plate 304, and a toothed ring 305. The cross bar 301 is rotatably connected to the exhaust pipe 121; the first fan blade 302 is located inside the exhaust pipe 121 and is mounted on the cross bar 301; the incomplete gear 303 is mounted at the lower end of the cross bar 301; the moving plate 304 is provided with a rectangular through groove, and two first toothed plates 3041 meshing with the incomplete gear 303 are installed in the rectangular through groove. A second toothed plate 3042 is mounted on the bottom surface of the moving plate 304; the toothed ring 305 is fixedly sleeved on the horizontal pipe 111, and the toothed ring 305 is meshingly connected with the second toothed plate 3042.

[0034] Specifically, when the water vapor is discharged through the exhaust pipe 121, it will blow the first fan blade 302 to rotate, thereby driving the cross bar 301 and the incomplete gear 303 to rotate. The rotating incomplete gear 303 will drive the moving plate 304 to reciprocate back and forth through the two first toothed plates 3041, thereby driving the second toothed plate 3042 to reciprocate back and forth, thereby driving the toothed ring 305 and the horizontal pipe 111 to alternately rotate clockwise and counterclockwise, thereby driving the vertical pipe 112 to swing back and forth.

[0035] As Figure 6 and Figure 7 shown, the drive mechanism 300 further includes a reciprocating lead screw 306, a lead screw nut 307, and a cleaning brush 308. The reciprocating lead screw 306 is rotatably mounted on the filter box 201, and the upper end of the reciprocating lead screw 306 is fixedly connected to the incomplete gear 303; the lead screw nut 307 is sleeved on the reciprocating lead screw 306; the cleaning brush 308 is slidably connected to the inner wall of the filter box 201, the cleaning brush 308 is fixedly connected to the lead screw nut 307, and the cleaning brush 308 contacts the filter plate 204.

[0036] Specifically, when the vacuum pump 205 operates, it will not only extract the gas in the inner cylinder 100, but also extract some small particle materials and transport them into the filter box 201. The filter plate 204 in the filter box 201 will filter the gas and leave the small particle materials in the filter box 201.

[0037] When the incomplete gear 303 rotates, it will drive the reciprocating lead screw 306 to rotate, thereby causing the lead screw nut 307 to reciprocate up and down, thereby driving the cleaning brush 308 to reciprocate up and down. The moving cleaning brush 308 will clean the filter plate 204 and brush off the small particle materials attached to the filter plate 204, thus preventing the small particle materials from clogging the filter plate 204.

[0038] As Figure 4 and Figure 6As shown, the suction filtration mechanism 200 further includes a plurality of exhaust holes 2011, a box door 203, and a protective box 207.

[0039] The plurality of exhaust holes 2011 are penetrated and opened on the front and back surfaces of the filter box 201; the box door 203 is hinged to the filter box 201; the protective box 207 is installed on the filter box 201, and the moving plate 304 and the incomplete gear 303 are both located inside the protective box 207.

[0040] Specifically, the gas filtered by the filter plate 204 will be discharged from the exhaust holes 2011. When it is necessary to take out the small particle materials in the filter box 201, the box door 203 can be opened to take out the materials.

[0041] As Figure 7 shown, the driving mechanism 300 further includes two guide plates 3043. The two guide plates 3043 are both installed on the moving plate 304, and the two guide plates 3043 penetrate through one side of the protective box 207 and are slidably connected to the protective box 207.

[0042] Specifically, by setting the guide plates 3043, the moving plate 304 can only move horizontally back and forth.

[0043] As Figure 1 and Figure 2 shown, the nitrogen vacuum dryer with a suction filtration and backwashing function further includes a discharge pipe 104. The discharge pipe 104 is installed on the bottom surface of the inner cylinder 100, and the lower end of the discharge pipe 104 extends outside the outer cylinder 101. A discharge valve is installed on the discharge pipe 104. By setting the discharge pipe 104, it is convenient to export the dried materials in the inner cylinder 100.

[0044] Working principle: In specific use, first connect the steam discharge mechanism 120 to an external heat recovery device, then add the materials to be dried into the inner cylinder 100, and then insert the sealing cover 105 into the inner cylinder 100. Then, inject water into the heating chamber 102.

[0045] Then, start the vacuum pump 205. The vacuum pump 205 pumps out the air inside the inner cylinder 100 through the suction pipe 206, the horizontal pipe 111, and the vertical pipe 112, so that the inside of the inner cylinder 100 is in a vacuum state. Then, start a plurality of heating tubes 103 to heat the water, and heat the inner cylinder 100 and the materials inside the inner cylinder 100 by raising the water temperature.

[0046] Since the inside of the inner cylinder 100 is in a vacuum state, the boiling point of the water in the materials inside the inner cylinder 100 will decrease, so that the moisture in the materials can be vaporized at a lower temperature, thus avoiding thermal damage to the materials caused by high temperature. At the same time, the vacuum environment also reduces the air resistance, enabling the water vapor on the surface of the materials to quickly diffuse and be pumped out by the vacuum pump 205, accelerating the drying speed.

[0047] When the moisture in the material evaporates to a certain extent, nitrogen is injected into the inner cylinder 100 by starting the nitrogen back-blowing mechanism 400 to displace the residual oxygen and moisture.

[0048] After drying is completed, the vacuum pump 205 and the heating tube 103 are turned off, and nitrogen is slowly injected into the drying chamber to restore normal pressure in the inner cylinder 100. Finally, the dried material is taken out.

[0049] Among them, when the heating tube 103 heats the water in the heating chamber 102, the water will vaporize into water vapor, resulting in an increase in pressure in the heating chamber 102. When the pressure in the heating chamber 102 exceeds the preset pressure value of the pressure relief valve 122, the pressure relief valve 122 will automatically open, and the water vapor in the heating chamber 102 will be discharged through the exhaust pipe 121. The water vapor discharged through the exhaust pipe 121 will blow the first fan blade 302 to rotate, thereby driving the cross bar 301 and the incomplete gear 303 to rotate. The rotating incomplete gear 303 will drive the moving plate 304 to reciprocate back and forth through two first toothed plates 3041, thereby driving the second toothed plate 3042 to reciprocate back and forth, and then driving the toothed ring 305 and the horizontal pipe 111 to rotate clockwise and counterclockwise alternately, and then driving the vertical pipe 112 to swing back and forth. The swinging vertical pipe 112 can stir the material, promote the penetration of air inside the material, reduce the flow resistance, and thus facilitate the vacuum pump 205 to extract the gas in the inner cylinder 100.

[0050] Moreover, when the incomplete gear 303 rotates, it will drive the reciprocating lead screw 306 to rotate, thereby causing the lead screw nut 307 to reciprocate up and down, and then driving the cleaning brush 308 to reciprocate up and down. The moving cleaning brush 308 will clean the filter plate 204 and brush off the small particle materials attached to the filter plate 204, thereby preventing the small particle materials from blocking the filter plate 204.

[0051] Embodiment 2: As Figure 1 、 Figure 2 and Figure 8 shown, in the case where other parts are the same as those in Embodiment 1, the difference between this embodiment and Embodiment 1 is that the nitrogen back-blowing mechanism 400 includes a high-pressure gas tank 401, a connecting pipe 402, and a gas pulse assembly.

[0052] The high-pressure gas tank 401 is filled with nitrogen; one end of the connecting pipe 402 is fixedly connected to the high-pressure gas tank 401, the other end of the connecting pipe 402 is rotatably connected to the horizontal pipe 111, and a valve 403 is installed on the connecting pipe 402; the gas pulse assembly is installed on the connecting pipe 402.

[0053] Specifically, after the valve 403 is opened, the nitrogen in the high-pressure gas tank 401 will enter the horizontal pipe 111 through the connecting pipe 402, and then be discharged through multiple vertical pipes 112. When the nitrogen passes through the through holes 113 on the vertical pipes 112, the through holes 113 can be back-blown to prevent material blockage of the through holes 113.

[0054] As Figure 8 shown, the gas pulse assembly includes a fixed disk 404, a rotating disk 405, a mounting bracket 407, a rotating shaft 408, and a second fan blade 409.

[0055] The fixed disk 404 is fixedly installed in the connecting pipe 402, and a plurality of first ventilation holes are penetrated through the fixed disk 404; the rotating disk 405 is rotatably installed in the connecting pipe 402, and a plurality of second ventilation holes 406 are penetrated through the rotating disk 405; the rotating disk 405 and the fixed disk 404 have the same size, and the second ventilation holes 406 and the first ventilation holes have the same size. When the rotating disk 405 rotates, the second ventilation holes 406 will be intermittently communicated with the first ventilation holes. The mounting bracket 407 is fixedly installed in the connecting pipe 402; the rotating shaft 408 is rotatably installed on the mounting bracket 407; the second fan blade 409 is installed on the rotating shaft 408.

[0056] Specifically, when the nitrogen passes through the connecting pipe 402, it will blow the second fan blade 409 to rotate, thereby driving the rotating shaft 408 to rotate, thereby driving the rotating disk 405 to rotate, so that the second ventilation holes 406 on the rotating disk 405 and the first ventilation holes on the fixed disk 404 are intermittently communicated. When the second ventilation holes 406 are communicated with the first ventilation holes, the nitrogen will enter the horizontal pipe 111 through the connecting pipe 402. When the second ventilation holes 406 are staggered from the first ventilation holes, the nitrogen cannot enter the horizontal pipe 111 through the connecting pipe 402.

[0057] Working principle: When it is necessary to transport nitrogen into the inner cylinder 100, by opening the valve 403, the nitrogen in the high-pressure gas tank 401 will enter the horizontal pipe 111 through the connecting pipe 402, and then be discharged through multiple vertical pipes 112. When the nitrogen passes through the through holes 113 on the vertical pipes 112, the through holes 113 can be back-blown to prevent material blockage of the through holes 113.

[0058] Moreover, when nitrogen gas passes through the connecting pipe 402, it will blow the second fan blade 409 to rotate, thereby driving the rotating shaft 408 to rotate, further driving the rotating disk 405 to rotate, and further causing the second ventilation holes 406 on the rotating disk 405 to be intermittently communicated with the first ventilation holes on the fixed disk 404, so that the connecting pipe 402 intermittently conveys nitrogen gas into the horizontal pipe 111. And because the nitrogen gas in the high-pressure gas tank 401 needs to pass through the second ventilation holes 406 and the first ventilation holes in a very short time, an instantaneous high-pressure pulse will be formed when the nitrogen gas passes through the second ventilation holes 406 and the first ventilation holes, making the impact force of the nitrogen gas entering the horizontal pipe 111 and the vertical pipe 112 greater, which is more conducive to back-blowing the through hole 113 and preventing the material from blocking the through hole 113.

[0059] Among them, by injecting nitrogen gas into the inner cylinder 100, the residual oxygen can also be replaced to form an inert atmosphere to prevent the material from undergoing an oxidation reaction, thereby protecting the chemical properties of the material; and for flammable, explosive or toxic materials, nitrogen gas can dilute the oxygen concentration in the system and reduce the risk of explosion or combustion.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A nitrogen vacuum dryer with a suction filtration and back-blowing function, comprising an outer cylinder and a sealing cover installed on an inner cylinder. A heating cavity for containing water is provided between the inner cylinder and the outer cylinder, and it is characterized in that, Also includes: A plurality of heating tubes are installed in the heating chamber; A horizontal tube, rotatably connected to the inner tube and the outer tube, and a plurality of vertical tubes with through holes are installed on the horizontal tube; A steam exhaust mechanism is installed on the outer cylinder and communicated with the heating chamber; The filtration mechanism is used to extract the gas in the inner cylinder, and includes: A filter box, wherein a filter plate is installed inside; A vacuum pump is installed on the top surface of the filter box, the air extraction pipe of the vacuum pump is rotatably connected to the horizontal pipe, and the air outlet pipe of the vacuum pump extends into the filter box; A driving mechanism, used for utilizing the steam discharged from the steam discharge mechanism to drive the plurality of vertical pipes to swing back and forth, and to clean the filter plates; The nitrogen backflush mechanism is used to transport nitrogen to the inner cylinder through the horizontal pipe and the vertical pipe.

2. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 1, wherein The steam exhaust mechanism comprises: An exhaust pipe, mounted on the outer cylinder; A pressure relief valve is installed on the exhaust pipe.

3. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 2, characterized in that, The driving mechanism comprises: A cross bar, rotatably connected to the exhaust pipe; A first fan blade is located in the exhaust pipe and mounted on the crossbar; An incomplete gear is mounted at the lower end of the crossbar; The movable plate is penetrated by a rectangular through slot, two first tooth plates meshing with incomplete gears are installed in the rectangular through slot, and a second tooth plate is installed on the bottom surface of the movable plate; The gear ring is fixedly sleeved on the transverse tube and meshedly connected with the second gear plate.

4. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 3, characterized in that, The driving mechanism further comprises: A reciprocating screw, rotatably mounted on the filter box, with an upper end fixedly connected to the incomplete gear; A lead screw nut, sleeved on the reciprocating lead screw; A cleaning brush is slidably connected to the inner wall of the filter box, fixedly connected to the lead screw nut, and in contact with the filter plate.

5. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 3, characterized in that, The filtration mechanism also includes: A plurality of exhaust holes are provided on the front and back of the filter box; A box door, hinged to the filter box; A protection box is installed on the filter box, and the moving plate and the incomplete gear are both located in the protection box.

6. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 5, characterized in that, The driving mechanism further comprises: Two guide plates are both mounted on the movable plate, penetrate one side of the protection box and are slidably connected with the protection box.

7. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 1, characterized in that, The nitrogen backflush mechanism comprises: High-pressure gas tanks; A connecting pipe, one end of which is fixedly connected to the high-pressure gas tank and the other end of which is rotatably connected to the horizontal pipe, and a valve is installed on the connecting pipe; A gas pulse assembly is installed on the connecting pipe.

8. The nitrogen vacuum dryer with a suction filtration and back-blowing function according to claim 7, characterized in that, The gas pulse assembly comprises: A fixed plate, fixedly installed in the connecting pipe, and having a plurality of first vent holes extending therethrough; A rotating disk is rotatably mounted in the connecting pipe and has a plurality of second vent holes extending therethrough; A mounting frame, fixedly mounted in the connecting pipe; A rotating shaft, rotatably mounted on the mounting frame; The second fan blade is mounted on the rotating shaft.

9. The nitrogen vacuum dryer with a suction filtration and backwashing function according to claim 1, wherein, Also includes: A discharge pipe is installed on the bottom surface of the inner cylinder and extends to the outside of the outer cylinder. A discharge valve is installed on the discharge pipe.

Images