Fume hood free sterilizer

Abstract

The present invention discloses a fume hood-free digester, which relates to the technical field of test sample pretreatment equipment. The technical solution thereof includes a control console and a test tube rack for placing test tubes, a heating base is arranged on the control console, and a test tube capping rack is arranged on the upper end of the test tube rack; a waste gas absorption box is arranged on the side end of the control console, a pump is arranged on the waste gas absorption box, and both ends of the pump are connected to the waste gas absorption box through a pumping pipe and a suction pipe; an air duct installed on the waste gas absorption box is also arranged, and the side end of the air duct is connected to the test tube capping rack through a corrugated hose. The present invention can fully seal the test tube during the digestion process by setting the test tube capping rack, and at the same time cooperate with the pump to circulate and pump the waste gas absorption liquid in the waste gas absorption box, thereby generating a liquid circulation loop, and then the air duct is connected to the circulation loop, which can drain the waste gas generated in the test tube and mix it with the absorption liquid, thereby avoiding the environmental pollution problem caused by direct discharge of waste gas.

Description

Technical Field

[0001] The invention relates to the technical field of test sample pretreatment equipment, in particular to a fume hood-free digester. Background Art

[0002] A digester is a device used to process test samples and is often used in the field of scientific experiments. Conventional digesters on the market are currently large in size, difficult to maintain, and relatively inconvenient to operate. Imported facilities are expensive and difficult to introduce in batches. At the same time, since the digester generates a large amount of waste gas during the digestion process, the existing facilities need to use a ventilation system to ventilate the room, but the exhaust gas discharged to the outside will cause certain pollution to the environment. The above-mentioned problems make the cost of scientific experiments too high, which is not conducive to creating a good scientific research environment.

[0003] In view of this, the present invention is designed to solve the above-mentioned problems.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Summary of the invention

[0005] The object of the present invention is to solve the above-mentioned shortcomings and provide a fume hood-free dehumidifier.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A fume hood-free digester comprises a control console and a test tube rack for placing test tubes, wherein the control console is provided with a heating base for heating the bottom of the test tube, and the upper end of the test tube rack is provided with a test tube capping rack for buckling on the test tube; a waste gas absorption box for storing waste gas absorption liquid is provided at the side end of the control console, and a pump is provided on the waste gas absorption box, and both ends of the pump are connected to the waste gas absorption box through a pumping pipe and a suction pipe respectively to form a total liquid circulation loop of the digester; an air duct installed on the waste gas absorption box is also provided on the total liquid circulation loop, and the side end of the air duct is connected to the test tube capping rack through a corrugated hose; when the internal liquid is circulating, the air duct drains and sucks the gas in the test tube capping rack through the corrugated hose.

[0008] Furthermore, the air duct includes an outer hopper and an inner hopper arranged in the outer hopper; a liquid down pipe is arranged at the bottom of the outer hopper, and the outer hopper is connected to the total liquid circulation loop of the digester through the upper side and the liquid down pipe, and the corrugated hose is connected to the bottom of the outer hopper near the side end of the liquid down pipe; a liquid passage cavity for liquid to pass through is formed between the inner hopper and the outer hopper, and a flow collection pipe is arranged at the bottom of the inner hopper, the inner diameter of the flow collection pipe is smaller than the liquid down pipe and the bottom end thereof extends into the liquid down pipe.

[0009] Furthermore, the interior of the waste gas absorption box is also provided with an aeration component connected to the total liquid circulation loop, and the aeration component includes a liquid distribution tube plate connected to the lower liquid pipe and an aeration tube sheet evenly distributed on the liquid distribution tube plate and connected thereto; the aeration tube sheet is densely covered with micropores.

[0010] Furthermore, the test tube rack includes a rack plate for clamping test tubes and a lifting assembly arranged on a control console for controlling the lifting of the rack plate; the rack plate is evenly provided with a plurality of through holes for the test tubes to pass through and overlapping the outer edges of the upper mouths of the test tubes; the lifting assembly includes a threaded rod and a limit rod arranged at the upper corners of the console; the rack plate is threadedly connected to the threaded rod and slidably sleeved with the limit rod through connecting rods arranged at the four corners; the rack plate is also provided with a docking sleeve located outside the through hole; the test tube capping rack includes a sealing cap plug that is adaptably coupled to the docking sleeve and is hollow inside, a main connecting plate arranged on the sealing cap plug, and an exhaust unit and a dripping unit arranged on the main connecting plate.

[0011] Furthermore, the exhaust unit includes an exhaust branch pipe that slides in a limited position in a first limiting groove opened on the main connecting plate and is movably connected to the sealing cap plug, a plurality of exhaust main pipes that are connected to the exhaust branch pipes in the same row, and a manifold that is connected to the plurality of exhaust main pipes, and the manifold is connected to the corrugated hose.

[0012] Furthermore, the dripping unit includes a dripping tube that slides in a limited position in a second limiting groove opened on the main connecting plate and is movably connected with the sealing cap plug, and a connecting grid that connects all the dripping tubes.

[0013] Furthermore, a partition plate is provided inside the sealing cap plug, and the exhaust branch pipe and the drip tube located inside the sealing cap plug slide on the upper surface of the partition plate, and a first pipe opening and a second pipe opening are respectively provided on one side of the two opposite to the partition plate, and a first opening and a second opening are respectively provided on the partition plate, and a first opening and a second opening which are connected to the first pipe opening and the second pipe opening respectively.

[0014] Furthermore, the interior of the waste gas absorption box is divided into a first liquid tank and a second liquid tank of equal space by a first partition, and aeration components are provided in the first liquid tank and the second liquid tank; a first valve box installed on the waste gas absorption box is provided between the suction pipe and the waste gas absorption box, and the first valve box is divided into a first total flow tank and a first diversion tank by a second partition, wherein the side end of the first total flow tank is connected with the suction pipe, and the bottom side of the first diversion tank is connected with the first liquid tank and the second liquid tank respectively through two groups of liquid pumping pipes; two groups of first liquid delivery holes for connecting the first total flow tank and the first diversion tank are provided on both sides of the second partition, and a first sealing and sliding piston block is provided in the first diversion tank, and the first piston block opens and closes the connecting port position of the first diversion tank and the liquid pumping pipe and the first liquid delivery hole on the same side of the connecting port alternately by sliding left and right; a second valve installed on the waste gas absorption box is provided between the pumping pipe and the waste gas absorption box The box, the second valve box is provided with a second total flow bin, a reversing bin, a second diverter bin and a liquid return bin isolated from each other, wherein the side end of the second total flow bin is connected with the pumping pipe, the side end of the liquid return bin is connected with the lower liquid pipe and a check valve is provided at the connecting port, the two sides of the second diverter bin are respectively connected to the two groups of liquid pipe plates through two groups of reflux pipes, and the side end of the reversing bin is connected with the upper side of the outer bucket through the absorption liquid delivery pipe; a second liquid delivery hole for communication is provided on the adjacent side walls of the second total flow bin and the reversing bin; third liquid delivery holes for communication are provided on both sides of the adjacent side walls of the second diverter bin and the liquid return bin, a second piston block with sealing sliding is provided in the second diverter bin, and the second piston block opens and closes the connecting port position of the second diverter bin and the reflux pipe and the third liquid delivery hole on the same side of the connecting port alternately by sliding left and right; a first driving assembly for synchronously driving the first piston block and the second piston block is also provided on the exhaust gas absorption box.

[0015] Furthermore, a heat exchange rack is also provided on the console. The heat exchange rack is made of a metal material with excellent thermal conductivity. The heat exchange rack is evenly provided with heat exchange sleeve holes for the test tubes to pass through, and the heat exchange sleeve holes are in contact with the test tube walls. A liquid injection cavity for liquid circulation is provided in the heat exchange rack. A liquid inlet and a liquid outlet connected to the liquid injection cavity are provided at the side end of the heat exchange rack. The reversing bin is connected to the liquid inlet through a cooling liquid delivery pipe, and the liquid return bin is connected to the liquid outlet through a cooling liquid return pipe, and a check valve is provided at the connecting port between the cooling liquid return pipe and the liquid return bin; a sealed sliding third piston block is provided in the reversing bin, and a fourth liquid delivery hole located on the symmetrical side of the second liquid delivery hole is also provided on the adjacent side walls of the second total flow bin and the reversing bin, and the third piston block opens and closes the connecting ports on both sides alternately by sliding left and right; a second driving component for driving the third piston block is also provided on the exhaust gas absorption box.

[0016] Furthermore, the first driving assembly includes a first reciprocating threaded screw rotatably arranged on the exhaust gas absorption box, a first motor driving the test tube rack console to rotate, and a first screw sleeve sleeved on the first reciprocating threaded screw, and the first screw sleeve is respectively connected to the first piston block and the second piston block through first connecting plates on both sides; the second driving assembly includes a second reciprocating threaded screw rotatably arranged on the exhaust gas absorption box, a second motor driving the second reciprocating threaded screw to rotate, and a second screw sleeve sleeved on the second reciprocating threaded screw, and the second screw sleeve is connected to the third piston block through a second connecting plate; a residual gear is also provided on the first reciprocating threaded screw, and a full gear periodically meshed with the residual gear is provided on the second reciprocating threaded screw.

[0017] Compared with the prior art, the beneficial effects of the present scheme are as follows: the present invention, through the provision of a test tube capping rack, can fully seal the test tube during the digestion process, and at the same time cooperate with a pump to circulate the waste gas absorption liquid in the waste gas absorption box, thereby generating a liquid circulation loop, and then connecting an air duct to the circulation loop, so that the waste gas generated in the test tube can be drained during the liquid circulation process, and fully mixed with the absorption liquid during the drainage process, thereby avoiding environmental pollution problems caused by direct discharge of waste gas, and at the same time also reducing the overall volume of the equipment, improving maintenance efficiency, and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a front perspective schematic diagram of an embodiment of the present invention;

[0020] Figure 2 is a side perspective schematic diagram of an embodiment of the present invention;

[0021] Figure 3 is a rear perspective schematic diagram of an embodiment of the present invention;

[0022] Figure 4 2 is a schematic top view of the internal structure of the exhaust gas absorption box in an embodiment of the present invention;

[0023] Figure 5 2 is a top perspective schematic diagram of the internal structure of the exhaust gas absorption box in an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the working state of an embodiment of the present invention;

[0025] Figure 7 is a front perspective schematic diagram of a heat exchange frame in an embodiment of the present invention;

[0026] Figure 8 is a cross-sectional perspective schematic diagram of a heat exchange frame in an embodiment of the present invention;

[0027] Fig. 9 is a rear perspective schematic diagram of a heat exchange frame in an embodiment of the present invention;

[0028] Fig.10 Schematic diagram of the upper structure of the exhaust gas absorption box in an embodiment of the present invention;

[0029] Fig.11 Schematic diagram of the internal structure of the exhaust gas absorption box in an embodiment of the present invention;

[0030] Fig.12 is a first-view schematic diagram of the pipeline layout in an embodiment of the present invention;

[0031] Fig.13 is a schematic diagram of the pipeline layout from a second viewing angle in an embodiment of the present invention;

[0032] Fig.14 is a schematic diagram of the coordination relationship between the first drive assembly and the second valve box structure in an embodiment of the present invention;

[0033] Fig.15 is a schematic diagram of the coordination relationship between the first drive assembly and the second drive assembly in an embodiment of the present invention;

[0034] Fig.16 is a schematic diagram of the connection relationship between the second valve box and the pipeline in an embodiment of the present invention;

[0035] Fig.17 is a schematic diagram of the connection relationship between the first valve box and the pipeline in an embodiment of the present invention;

[0036] Fig.18 is a schematic diagram of the internal structure of the first valve box in an embodiment of the present invention;

[0037] Fig.19 is a schematic diagram of the internal structure of the second valve box in an embodiment of the present invention;

[0038] Fig. 20 is a cross-sectional perspective schematic diagram of an air bleed hopper in an embodiment of the present invention;

[0039] Fig.21 is a schematic structural diagram of a shelf plate in an embodiment of the present invention;

[0040] Fig. 22 1 is a schematic diagram of the disassembly of a test tube capping rack and a rack plate in an embodiment of the present invention;

[0041] Fig.23 is a schematic diagram of a combined cross-section of a test tube capping rack and a rack plate in an embodiment of the present invention;

[0042] Fig.24 is a schematic structural diagram of a test tube capping rack according to an embodiment of the present invention;

[0043] Fig.25 Schematic diagram of the matching relationship between the sealing cap plug, the exhaust branch pipe and the dripping pipe in the embodiment of the present invention;

[0044] Fig.26 is a schematic diagram of the internal structure of the sealing cap plug in an embodiment of the present invention;

[0045] Fig. 27 1 is a schematic diagram of the structure of the exhaust branch pipe and the dripping pipe in an embodiment of the present invention when viewed from above;

[0046] Fig.28 yes Fig.23 A magnified schematic diagram of center A.

[0047] In the figure: 1. control console; 11. test tube rack; 12. heating base; 2. exhaust gas absorption box; 20. test tube capping rack; 21. pump; 22. pumping pipe; 23. suction pipe; 24. air hopper; 25. corrugated hose; 26. first partition; 27. first liquid tank; 28. second liquid tank; 3. outer bucket; 31. inner bucket; 32. lower liquid pipe; 33. liquid cavity; 34. collecting flow pipe; 4. liquid distribution tube plate; 41. aeration tube segment; 5. rack plate; 51, through hole; 52, threaded rod; 53, limit rod; 54, connecting rod; 55, docking sleeve; 56, sealing cap plug; 57, main connecting plate; 58, first limit groove; 59, second limit groove; 6, exhaust branch pipe; 61, exhaust main pipe; 62, confluence pipe; 63, drip pipe; 64, connecting grid; 65, partition plate; 66, first pipe opening; 67, second pipe opening; 68, first through port; 69, second through port; 7, first valve box; 7 1. Second baffle; 72. First total flow chamber; 73. First shunt chamber; 74. Liquid extraction pipe; 75. First liquid delivery hole; 76. First piston block; 8. Second valve box; 81. Second total flow chamber; 82. Reversing chamber; 83. Second shunt chamber; 84. Liquid return chamber; 85. Reflux pipe; 86. Absorption liquid delivery pipe; 87. Second liquid delivery hole; 88. Third liquid delivery hole; 89. Second piston block; 9. Heat exchange rack; 91. Heat exchange jacket hole; 92. Liquid injection chamber ; 93. Liquid inlet; 94. Liquid outlet; 95. Cooling liquid delivery pipe; 96. Cooling liquid return pipe; 97. Third piston block; 98. Fourth liquid delivery hole; 101. First reciprocating threaded screw; 102. First motor; 103. First screw sleeve; 104. First connecting plate; 105. Second reciprocating threaded screw; 106. Second motor; 107. Second screw sleeve; 108. Second connecting plate; 109. Residual gear; 1010. Complete gear. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0049] like Figure 1-28 The fume hood-free digester shown in the figure comprises a control console 1 and a test tube rack 11 for placing test tubes, the control console 1 is provided with a heating base 12 for heating the bottom of the test tube, and the upper end of the test tube rack 11 is matched with a test tube capping rack 20 for buckling on the test tube; a waste gas absorption box 2 for storing waste gas absorption liquid is provided at the side end of the control console 1, and a pump 21 is provided on the waste gas absorption box 2, and both ends of the pump 21 are connected to the waste gas absorption box 2 through a pumping pipe 22 and a suction pipe 23 respectively to form a total liquid circulation loop of the digester; an air duct 24 installed on the waste gas absorption box 2 is also provided on the total liquid circulation loop, and the side end of the air duct 24 is connected to the test tube capping rack 20 through a corrugated hose 25, and the corrugated hose 25 is connected to the test tube capping rack 20. The corrugated hose 25 is made of high-temperature resistant material; when the internal liquid circulates in the air duct 24, the gas in the test tube capping rack 20 is drained and sucked through the corrugated hose 25. The air duct 24 includes an outer duct 3 and an inner duct 31 arranged in the outer duct 3; a liquid down pipe 32 is arranged at the bottom of the outer duct 3, and the outer duct 3 is connected to the total liquid circulation loop of the digester through the upper side and the liquid down pipe 32. The corrugated hose 25 is connected to the bottom of the outer duct 3 near the side end of the liquid down pipe 32; a liquid passage cavity 33 for liquid to pass through is formed between the inner duct 31 and the outer duct 3, and a flow collection pipe 34 is arranged at the bottom of the inner duct 31. The inner diameter of the flow collection pipe 34 is smaller than that of the liquid down pipe 32, and its bottom end extends into the liquid down pipe 32.

[0050] When the device is digesting, the test tube is placed on the test tube rack 11, and the test tube cover rack 20 is buckled on the upper mouth of the test tube. The heating base 12 is provided with a plurality of arc grooves for placing the bottom of the test tube. The heating base 12 performs digestion by heating the bottom of the test tube. During the digestion process, the waste gas enters the inside of the test tube cover rack 20, and the pump 21 is started synchronously. The waste gas absorption liquid (usually sodium hydroxide solution) in the waste gas absorption box 2 is pumped and refluxed through the pumping pipe 22 and the suction pipe 23, thereby forming a liquid circulation loop. At the same time, the air duct 24 is connected to this circulation loop, so that the waste gas absorption liquid enters the liquid passage cavity 33, flows into the collecting pipe 34, and enters the lower liquid pipe 32 for reflux. The high-speed flow of the water flow The movement will cause negative pressure to appear at the connection point between the lower liquid pipe 32 and the outer bucket 3, and then the waste gas in the test tube capping rack 20 will be drained through the corrugated hose 25, so that it enters the outer bucket 3 through the corrugated hose 25 and refluxes with the absorption liquid. During the reflux process, it is fully mixed and reacted with the waste gas, and the unreacted waste gas continues to react in the waste gas absorption box 2 or during the liquid circulation process until it is completely absorbed by the absorption liquid, thereby achieving the effect of efficient absorption of waste gas. Compared with traditional waste gas suction, this structure does not need to use a larger sealing cover to collect and then suck the waste gas, but instead simultaneously drains and mixes the waste gas during the circulation process of the absorption liquid. The overall volume is smaller and the absorption efficiency is relatively more efficient.

[0051] In one embodiment, an aeration assembly connected to the total liquid circulation loop is also provided inside the waste gas absorption box 2, and the aeration assembly includes a liquid distribution tube plate 4 connected to the lower liquid pipe 32 and an aeration tube sheet 41 evenly distributed on the liquid distribution tube plate 4 and connected thereto; the aeration tube sheet 41 is densely covered with micropores.

[0052] When the exhaust gas absorption box 2 is filled with absorption liquid, its liquid level height is preferably to completely immerse the aeration tube sheet 41. After entering the liquid passage cavity 33, the absorption liquid mixed with the exhaust gas returns to the exhaust gas absorption box 2 through the lower liquid pipe 32 and flows into the liquid separator plate 4. The liquid separator plate 4 is diverted into the aeration tube sheet 41, and the aeration is dispersed into the absorption liquid through the micropores on the aeration tube sheet 41 into the total absorption liquid, thereby ensuring that the unabsorbed exhaust gas can be more fully and evenly mixed with the absorption liquid, thereby improving the overall exhaust gas absorption efficiency.

[0053] In one embodiment, the test tube rack 11 includes a rack plate 5 for clamping test tubes and a lifting assembly arranged on the control console 1 for controlling the lifting of the rack plate 5; a plurality of through holes 51 are evenly distributed on the rack plate 5 for the test tubes to pass through and overlap the outer edges of the upper mouths of the test tubes; the lifting assembly includes a threaded rod 52 and a limit rod 53 arranged at the upper corners of the control console 1; the rack plate 5 is threadedly connected to the threaded rod 52 and slidably sleeved with the limit rod 53 through connecting rods 54 arranged at the four corners; a docking sleeve 55 is also arranged on the rack plate 5 and is located outside the through hole 51; the test tube capping rack 20 includes a sealing cap plug 56 that is adaptably matched with the docking sleeve 55 and is hollow inside, a main connecting plate 57 arranged on the sealing cap plug 56, and an exhaust unit and a drip unit arranged on the main connecting plate 57.

[0054] The threaded rods 52 are optimally arranged into two groups and are located at diagonal positions on the console 1, and the limit rods 53 are set at the other two diagonal positions of the console 1. The threaded rods 52 drive the shelf 5 to rise and fall by rotating, so that when the sample reaction inside the test tube is completed, the shelf 5 is controlled to rise, so that the test tube mounted on the shelf 5 is separated from the heating base 12, thereby preventing the preheat in the heating base 12 from being transferred to the test tube, thereby improving the cooling efficiency of the test tube.

[0055] In one embodiment, the exhaust unit includes an exhaust branch pipe 6 that slides in a limited position in a first limiting groove 58 opened on the main connecting plate 57 and is movably connected to the sealing cap plug 56, a plurality of exhaust main pipes 61 that are commonly connected to the exhaust branch pipes 6 located in the same row, and a manifold 62 that is commonly connected to the plurality of exhaust main pipes 61, the manifold 62 is connected to the corrugated hose 25, the drip unit includes a drip tube 63 that slides in a limited position in a second limiting groove 59 opened on the main connecting plate 57 and is movably connected to the sealing cap plug 56, and a connecting grid 64 that connects all the drip tubes 63, a partition plate 65 is provided inside the sealing cap plug 56, the exhaust branch pipe 6 and the drip tube 63 are partially located inside the sealing cap plug 56 and slide on the upper surface of the partition plate 65, and a first pipe opening 66 and a second pipe opening 67 are respectively provided on one side of the two opposite to the partition plate 65, and a first opening 68 and a second opening 69 that are respectively connected to the first pipe opening 66 and the second pipe opening 67 are provided on the partition plate 65.

[0056] The exhaust branch pipe 6 and the dripping tube 63 can be aligned and staggered with the first opening 68 and the second opening 69 on the partition plate 65 by sliding. Before digestion, the sample in the test tube is placed on the test tube rack 11, and then the test tube cover rack 20 is buckled, and then the connection grid 64 is controlled to make all groups of dripping tubes 63 move synchronously and align with the second opening 69, and then the sodium peroxide is dripped into the dripping tube 63 in order by using a pipette, and slides through the second opening 69 in the dripping tube 63. , and finally drip into the test tube. When the dripping in all groups of test tubes is completed, the dripping tube 63 is moved to be offset with the second opening 69, and the exhaust main pipe 61 is controlled to move as a whole, so that the exhaust branch pipe 6 moves to be aligned with the first opening 68. At this time, the exhaust gas generated by the test tube during the digestion process will enter the exhaust main pipe 61 through the exhaust branch pipe 6, and enter the confluence pipe 62 through the exhaust main pipe 61, and then flow into the outer bucket 3 through the corrugated hose 25 during the circulation of the absorption liquid in the air duct 24.

[0057] In one embodiment, the interior of the exhaust gas absorption box 2 is divided into a first liquid tank 27 and a second liquid tank 28 of equal space by a first partition 26, and aeration components are provided in the first liquid tank 27 and the second liquid tank 28; a first valve box 7 installed on the exhaust gas absorption box 2 is provided between the suction pipe 23 and the exhaust gas absorption box 2, and the first valve box 7 is divided into a first total flow tank 72 and a first diversion tank 73 by a second partition 71, wherein the side end of the first total flow tank 72 is connected to the suction pipe 23, and the bottom side of the first diversion tank 73 is connected to the first liquid tank 27 and the second liquid tank 28 respectively through two groups of suction pipes 74; two groups of first liquid delivery holes 75 for connecting the first total flow tank 72 and the first diversion tank 73 are provided on both sides of the second partition 71, and the first diversion tank 73 has a first liquid delivery hole 75 for connecting the first total flow tank 72 and the first diversion tank 73. A sealing and sliding first piston block 76 is provided, and the first piston block 76 opens and closes the connecting port position of the first diverter bin 73 and the liquid pumping pipe 74 and the first liquid delivery hole 75 on the same side of the connecting port in an alternating manner by sliding left and right; a second valve box 8 installed on the waste gas absorption box 2 is provided between the pumping pipe 22 and the waste gas absorption box 2, and the second valve box 8 is provided with a second total flow bin 81, a reversing bin 82, a second diverter bin 83, and a liquid return bin 84 which are isolated from each other, wherein the side end of the second total flow bin 81 is connected to the pumping pipe 22, the side end of the liquid return bin 84 is connected to the lower liquid pipe 32 and a check valve is provided at the connecting port position, the two sides of the second diverter bin 83 are respectively connected to the two groups of liquid pipe plates 4 through two groups of reflux pipes 85, and the side end of the reversing bin 82 is connected to the absorption and delivery The liquid pipe 86 is connected to the upper side of the outer bucket 3; a second liquid delivery hole 87 for communication is provided on the adjacent side walls of the second total flow chamber 81 and the reversing chamber 82; third liquid delivery holes 88 for communication are provided on both sides of the adjacent side walls of the second shunt chamber 83 and the return liquid chamber 84, and a sealed and sliding second piston block 89 is provided in the second shunt chamber 83. The second piston block 89 slides left and right to stagger the opening position of the second shunt chamber 83 and the return pipe 85 and the third liquid delivery hole 88 on the same side of the connecting port to open and close; the exhaust gas absorption box 2 is also provided with a first drive component for synchronously driving the first piston block 76 and the second piston block 89, and the control console 1 is also provided with a heat exchange frame 9, which is made of metal with excellent thermal conductivity, and has evenly distributed openings on the heat exchange frame 9. There is a heat exchange sleeve hole 91 for the test tube to pass through, and the heat exchange sleeve hole 91 is in contact with the test tube wall. A liquid injection cavity 92 for liquid circulation is arranged in the heat exchange frame 9. A liquid inlet 93 and a liquid outlet 94 connected to the liquid injection cavity 92 are provided at the side end of the heat exchange frame 9. The reversing chamber 82 is connected to the liquid inlet 93 through a cooling liquid delivery pipe 95, and the return liquid chamber 84 is connected to the liquid outlet 94 through a cooling liquid return pipe 96. A check valve is provided at the connecting port of the cooling liquid return pipe 96 and the return liquid chamber 84. A sealed sliding third piston block 97 is provided in the reversing chamber 82. A fourth liquid delivery hole 98 located on the symmetrical side of the second liquid delivery hole 87 is also provided on the adjacent side walls of the second total flow chamber 81 and the reversing chamber 82. The third piston block 97 opens and closes the connecting ports on both sides alternately by sliding left and right.The exhaust gas absorption box 2 is also provided with a second drive assembly for driving the third piston block 97, the first drive assembly includes a first reciprocating threaded screw 101 rotatably arranged on the exhaust gas absorption box 2, a first motor 102 driving the test tube rack 11 console 1 to rotate, and a first screw sleeve 103 sleeved on the first reciprocating threaded screw 101, the first screw sleeve 103 is respectively connected to the first piston block 76 and the second piston block 89 through the first connecting plates 104 on both sides; the second drive assembly includes a second reciprocating threaded screw 101 rotatably arranged on the exhaust gas absorption box 2 5. A second motor 106 driving the second reciprocating threaded screw 105 to rotate and a second screw sleeve 107 sleeved on the second reciprocating threaded screw 105, the second screw sleeve 107 is connected to the third piston block 97 through a second connecting plate 108, and the first valve box 7 and the second valve box 8 are both provided with a limiting slide groove for the first connecting plate 104 and the second connecting plate 108 to limit the sliding movement; a residual gear 109 is also provided on the first reciprocating threaded screw 101, and a full gear 1010 periodically meshing with the residual gear 109 is provided on the second reciprocating threaded screw 105. ;

[0058] The power mechanism on the digester is controlled by PLC, so that the overall digestion process can be carried out accurately. Since the digestion process is divided into two stages, in the first stage, the test tube is heated and digested, and a chemical reaction occurs inside it to produce waste gas. After the reaction has been going on for a certain period of time, the amount of waste gas generated gradually decreases until it stops completely. At this time, it enters the second stage. In the second stage, the test tube needs to be cooled. In order to accelerate this process, the waste gas absorption box 2 is divided into a first liquid tank 27 and a second liquid tank 28. The first liquid tank 27 and the second liquid tank 28 store the same amount of waste gas absorption liquid. One group of waste gas absorption liquid is used for waste gas absorption in the first stage (in this process, the waste gas absorption liquid will be due to the reaction with the high-temperature waste gas). Mixing and temperature rise), when the absorption is completed, another set of waste gas absorption liquid is used as a coolant to circulate in the heat exchange rack 9 to cool the test tube, thereby completing a digestion process. After this process is completed, the absorption liquid that has not absorbed the waste gas can be used for the waste gas absorption of the next digestion test. After the first stage of the second test is over, the absorption liquid that has absorbed the waste gas has been completely cooled, and it can be used as a coolant to cool the test tube, thereby realizing the alternating use of the waste gas absorption liquid for cooling and waste gas absorption, and at the same time ensuring that the absorption liquid in the waste gas absorption box 2 is filled to complete two tests, reducing the liquid replacement work, thereby greatly improving the test efficiency as a whole.

[0059] The specific implementation process is: in the initial state, the first piston block 76, the second piston block 89, and the third piston block 97 are located on the same side. When the first stage of the first test is carried out, the test tube is heated and digested by the heating base 12. Waste gas is generated in this process. The pump 21 is started synchronously during the digestion process. At this time, it generates a suction force into the first total flow chamber 72 through the suction pipe 23. The first piston block 76 is located in the first diversion chamber 73, and the first liquid delivery hole 75 on one side of the second partition plate 71 is blocked, and the first liquid delivery hole 75 on the other side is opened, and then the first diversion chamber 73 is sucked into the first liquid chamber 27 through the suction pipe 74 on the same side as the opened first liquid delivery hole 75, so that the waste gas absorption liquid therein enters the first diversion chamber 73 through the suction pipe 74, and passes through the first total flow chamber 72, the suction pipe 23, and the suction pipe 23. The suction pipe 23 flows into the pumping pipe 22, and then the absorption liquid enters the second total flow chamber 81 in the second valve box 8 through the pumping pipe 22. At this time, the third piston block 97 blocks the connecting port between the reversing chamber 82 and the cooling liquid delivery pipe 95, so that the absorption liquid enters the reversing chamber 82 through the second liquid delivery hole 87 and then flows to the absorption liquid delivery pipe 86, thereby entering the air hopper 24, and refluxes to the return liquid chamber 84 through the lower liquid pipe 32 on the air hopper 24. The second piston block 89 is located on the same side of the first piston block 76, so that after the absorption liquid enters the return liquid chamber 84, it will enter the reflux pipe 85 on the same side as the suction pipe 74 that is pumping liquid through the third liquid delivery hole 88 on one side, and reflux to the aeration component through the reflux pipe 85 to enter the absorption liquid in the first liquid chamber 27, completing the liquid circulation.

[0060] When the first stage is over, the heating base 12 stops heating, and the threaded rod 52 rotates, thereby driving the frame plate 5 to lift the test tube, so that the bottom of the test tube is separated from the heating base 12, and then the first motor 102 is started, thereby driving the first reciprocating threaded screw 101 to rotate. When the first reciprocating threaded screw 101 rotates, the second reciprocating threaded screw 105 is driven to rotate through the meshing of the residual gear 109 and the full gear 1010 (the first reciprocating threaded screw 101 rotates so that the first screw sleeve 101 at its upper end is 3 moves from one threaded end to the other threaded end, the second reciprocating threaded screw 105 also drives the second screw sleeve 107 to move from one threaded end to the other threaded end), thereby causing the first piston block 76 and the second piston block 89 to switch directions, and the third piston block 97 also switches directions at the same time. At this time, the switching of the first piston block 76 closes the liquid extraction pipe 74 connected to the first liquid tank 27, and opens the liquid extraction pipe 74 connected to the second liquid tank 28, thereby sucking up the waste gas absorption liquid in the second liquid tank 28 and passing through The first liquid delivery hole 75 enters the first total flow chamber 72, and then flows to the suction pipe 23 and the pumping pipe 22 to enter the second total flow chamber 81. Due to the reversal of the third piston block 97, the communication port position between the reversing chamber 82 and the cooling liquid delivery pipe 95 is opened, and the absorption liquid enters the cooling liquid delivery pipe 95 through the reversing chamber 82 and flows into the injection chamber 92 in the heat exchange frame 9. The absorption liquid exchanges heat with the outer surface of the test tube through the heat exchange frame 9, and then continuously absorbs heat to cool the test tube. Then the absorption liquid flows back to the cooling chamber through the liquid outlet 94. The waste gas absorption liquid enters the return liquid pipe 96 and enters the return liquid tank 84 (because a check valve is provided between the lower liquid pipe 32 and the return liquid tank 84, it will not flow into the lower liquid pipe 32). At this time, the second piston block 89 is reversed, so that the return pipe 85 on the other side thereof is opened, so that the absorption liquid flows back to the aeration component in the second liquid tank 28, thereby realizing the circulation cooling effect of the waste gas absorption liquid in the second liquid tank 28. After cooling for a certain period of time, the pump 21 stops operating, the test tube is taken out to obtain the sample, and a digestion operation is completed.

[0061] Then, when the second digestion operation is required, the test tubes are continued to be placed, and then the system controls the second motor 106 to start, so that the second reciprocating threaded screw 105 rotates, so that the second threaded screw sleeve 107 drives the third piston block 97 to change direction, so that the communication port position between the reversing bin 82 and the absorption liquid delivery pipe 86 is opened, and at the same time, although the rotation of the second reciprocating threaded screw 105 drives the full gear 1010 to rotate, the rotation of the full gear 1010 will not affect the rotation of the residual gear 109, and then the first reciprocating threaded screw 10 1 does not rotate, at this time, the first piston block 76 and the second piston block 89 do not reverse, and then when the pump 21 is continuously started, the circulating absorption liquid in the second liquid tank 28 is still circulated and sucked by the pump, and when it flows through the reversing tank 82, it will enter the air duct 24 through the absorption liquid delivery pipe 86, and then begin to absorb the exhaust gas of the second test and flow back to the second liquid tank 28. When the first stage of the second test is over, the first motor 102 is driven again, so that the first piston block 76, the third piston block 97, and the second piston block 98 are rotated. The block 89 is reversed synchronously, and at this time, the pump 21 starts to pump the absorption liquid that has absorbed the exhaust gas in the first liquid tank 27, and pumps it into the cooling liquid delivery pipe 95 to realize the second stage of cooling cycle. Therefore, the overall process uses the exhaust gas absorption liquid in the first liquid tank 27 and the second liquid tank 28 to alternately complete the exhaust gas absorption and cooling cycle work in the two tests. At the same time, the device only uses two sets of motors (i.e., the first motor 102 and the second motor 106) for the liquid circuit circulation control in the first valve box 7 and the second valve box 8. Combined with the transmission structure of the residual gear 109 and the full gear 1010, the switching effect of the four modes of alternating circulation control of the absorption liquid in the first liquid tank 27 and the second liquid tank 28 and using the absorption liquid for cooling is realized. The control structure is simplified to the maximum extent, so that the above-mentioned work can be realized with the cooperation of the minimum drive unit, reducing the complexity of circuit control, improving the overall durability of the equipment, reducing maintenance costs, and greatly reducing the overall manufacturing cost of the equipment, and its application prospects are more extensive.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A fume hood-free digester, comprising a control console (1) and a test tube rack (11) for placing test tubes, wherein the control console (1) is provided with a heating base (12) for heating the bottom of the test tube, and wherein: The upper end of the test tube rack (11) is equipped with a test tube capping rack (20) for buckling onto the test tube; A waste gas absorption box (2) for storing waste gas absorption liquid is arranged at the side end of the control console (1); a pump (21) is arranged on the waste gas absorption box (2); two ends of the pump (21) are connected to the waste gas absorption box (2) through a pumping pipe (22) and a suction pipe (23) respectively, to form a total liquid circulation loop of the digester; The liquid total circulation loop is also provided with an air induction hopper (24) mounted on the waste gas absorption box (2), and the side end of the air induction hopper (24) is connected to the test tube capping rack (20) through a corrugated hose (25); The air duct (24) drains and sucks the gas in the test tube capping rack (20) through the corrugated hose (25) when the internal liquid is circulating. The air bleed bucket (24) comprises an outer bucket (3) and an inner bucket (31) arranged inside the outer bucket (3); A liquid down pipe (32) is provided at the bottom of the outer bucket (3); the outer bucket (3) is connected to the liquid total circulation loop of the digester through the upper side and the liquid down pipe (32); the corrugated hose (25) is connected to the bottom of the outer bucket (3) near the side end of the liquid down pipe (32); A liquid passage cavity (33) for liquid to pass through is formed between the inner bucket (31) and the outer bucket (3). A flow collecting pipe (34) is provided at the bottom of the inner bucket (31). The inner diameter of the flow collecting pipe (34) is smaller than that of the lower liquid pipe (32), and the bottom end of the flow collecting pipe (34) extends into the lower liquid pipe (32).

2. The fume hood-free digester according to claim 1, characterized in that: An aeration assembly connected to the liquid total circulation loop is also provided inside the waste gas absorption box (2), the aeration assembly comprising a liquid distribution pipe plate (4) connected to the lower liquid pipe (32) and aeration pipe sheets (41) evenly distributed on the liquid distribution pipe plate (4) and connected thereto; The aeration tube sheet (41) is densely covered with micropores.

3. The fume hood-free digester according to claim 1 or 2, characterized in that: The test tube rack (11) comprises a rack plate (5) for clamping the test tube and a lifting assembly arranged on the control console (1) for controlling the lifting of the rack plate (5); The frame plate (5) is evenly provided with a plurality of through holes (51) for the test tubes to pass through and overlapping the outer edges of the upper ends of the test tubes. The lifting assembly comprises a threaded rod (52) and a limit rod (53) arranged at the upper corner of the console (1). The frame plate (5) is threadedly connected to the threaded rod (52) and slidably sleeved with the limit rod (53) through connecting rods (54) arranged at the four corners. The frame plate (5) is also provided with a docking sleeve (55) located at the periphery of the through hole (51); The test tube capping rack (20) comprises a sealing cap plug (56) which is adapted to be matched with the docking sleeve (55) and has a hollow interior, a main connecting plate (57) arranged on the sealing cap plug (56), and an exhaust unit and a dripping unit arranged on the main connecting plate (57).

4. The fume hood-free digester according to claim 3, characterized in that: The exhaust unit comprises an exhaust branch pipe (6) which is limitedly slidable in a first limit groove (58) provided on the main connection plate (57) and movably connected to the sealing cap plug (56), a plurality of exhaust main pipes (61) which are in common communication with the exhaust branch pipes (6) located in the same row, and a manifold (62) which is in common communication with the plurality of exhaust main pipes (61), wherein the manifold (62) is in communication with the corrugated hose (25).

5. The fume hood-free digester according to claim 4, characterized in that: The dripping unit comprises a dripping tube (63) which slides in a limited position in a second limited groove (59) provided on the main connecting plate (57) and is movably connected to the sealing cap plug (56), and a connecting grid frame (64) which connects all the dripping tubes (63).

6. The fume hood-free digester according to claim 4 or 5, characterized in that: A partition plate (65) is provided inside the sealing cap plug (56); the exhaust branch pipe (6) and the dripping pipe (63) are located inside the sealing cap plug (56) and slide on the upper surface of the partition plate (65); and a first pipe opening (66) and a second pipe opening (67) are respectively provided on a side of the two pipes opposite to the partition plate (65); and a first opening (68) and a second opening (69) are respectively provided on the partition plate (65) and are in communication with the first pipe opening (66) and the second pipe opening (67).

7. The fume hood-free digester according to claim 5, characterized in that: The interior of the exhaust gas absorption box (2) is divided into a first liquid bin (27) and a second liquid bin (28) of equal space by a first partition plate (26), and an aeration component is disposed in both the first liquid bin (27) and the second liquid bin (28); A first valve box (7) mounted on the exhaust gas absorption box (2) is provided between the suction pipe (23) and the exhaust gas absorption box (2); the first valve box (7) is divided into a first total flow bin (72) and a first diversion bin (73) by a second partition plate (71); the side end of the first total flow bin (72) is in communication with the suction pipe (23); and the bottom side of the first diversion bin (73) is in communication with the first liquid bin (27) and the second liquid bin (28) respectively by two groups of liquid extraction pipes (74); Two groups of first liquid delivery holes (75) for connecting the first total flow chamber (72) and the first flow distribution chamber (73) are provided on both sides of the second partition plate (71); a first piston block (76) is provided in the first flow distribution chamber (73) for sealing and sliding; the first piston block (76) slides left and right to alternately open and close the communication port position between the first flow distribution chamber (73) and the liquid extraction pipe (74) and the first liquid delivery hole (75) on the same side as the communication port; A second valve box (8) mounted on the exhaust gas absorption box (2) is provided between the pumping pipe (22) and the exhaust gas absorption box (2), and a second total flow bin (81), a reversing bin (82), a second diverting bin (83), and a liquid return bin (84) are provided in the second valve box (8), wherein the side end of the second total flow bin (81) is connected to the pumping pipe (22), the side end of the liquid return bin (84) is connected to the lower liquid pipe (32), and a check valve is provided at the communication port, the two sides of the second diverting bin (83) are respectively connected to the two groups of liquid pipe plates (4) through two groups of return pipes (85), and the side end of the reversing bin (82) is connected to the upper side of the outer bucket (3) through the absorption liquid delivery pipe (86); Second liquid delivery holes (87) for communication are provided on adjacent side walls of the second total flow chamber (81) and the reversing chamber (82); A third liquid delivery hole (88) for communication is provided on both sides of the adjacent side walls of the second diverter chamber (83) and the return liquid chamber (84); a second piston block (89) is provided in the second diverter chamber (83) for sealing and sliding; the second piston block (89) slides left and right to alternately open and close the communication port position between the second diverter chamber (83) and the return pipe (85) and the third liquid delivery hole (88) on the same side as the communication port; The exhaust gas absorption box (2) is also provided with a first drive assembly for synchronously driving the first piston block (76) and the second piston block (89).

8. The fume hood-free digester according to claim 7, characterized in that: The control console (1) is also provided with a heat exchange frame (9), the heat exchange frame (9) is made of a metal material with excellent heat conductivity, the heat exchange frame (9) is evenly provided with heat exchange holes (91) for the test tubes to pass through, and the heat exchange holes (91) are in contact with the walls of the test tubes, the heat exchange frame (9) is provided with a liquid injection cavity (92) for liquid circulation, the side end of the heat exchange frame (9) is provided with a liquid inlet (93) and a liquid outlet (94) which are connected to the liquid injection cavity (92), the reversing chamber (82) is connected to the liquid inlet (93) through a cooling liquid delivery pipe (95), the liquid return chamber (84) is connected to the liquid outlet (94) through a cooling liquid return pipe (96), and a check valve is provided at the connection position between the cooling liquid return pipe (96) and the liquid return chamber (84); A third piston block (97) is provided in the reversing chamber (82) for sealing and sliding. A fourth liquid delivery hole (98) is also provided on the adjacent side walls of the second total flow chamber (81) and the reversing chamber (82) and is located on the symmetrical side of the second liquid delivery hole (87). The third piston block (97) opens and closes the communication ports on both sides alternately by sliding left and right. The exhaust gas absorption box (2) is also provided with a second driving assembly for driving the third piston block (97).

9. The fume hood-free digester according to claim 8, characterized in that: The first driving assembly comprises a first reciprocating threaded screw (101) rotatably arranged on the exhaust gas absorption box (2), a first motor (102) driving the test tube rack (11) control console (1) to rotate, and a first screw sleeve (103) sleeved on the first reciprocating threaded screw (101), the first screw sleeve (103) being respectively connected to the first piston block (76) and the second piston block (89) via first connecting plates (104) on both sides; The second driving assembly comprises a second reciprocating threaded screw (105) rotatably arranged on the exhaust gas absorption box (2), a second motor (106) driving the second reciprocating threaded screw (105) to rotate, and a second screw sleeve (107) sleeved on the second reciprocating threaded screw (105), the second screw sleeve (107) being connected to the third piston block (97) via a second connecting plate (108); The first reciprocating threaded screw (101) is also provided with a residual gear (109), and the second reciprocating threaded screw (105) is provided with a full gear (1010) that periodically meshes with the residual gear (109).

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