Air filtering device for drying liquid medicine and vacuum drying box

Abstract

The invention discloses an air filtering device for liquid medicine drying and a vacuum drying oven, and relates to the technical field of liquid medicine vacuum drying, and the air filtering device comprises an air filter body which comprises an air inlet pipe and a negative pressure pipe, and the air filter body is provided with a communication port; the valve body is mounted on the air filter body, and a main valve cavity is formed in the valve body; the main valve block slides in the main valve cavity and divides the main valve cavity into a first cavity and a second cavity, a valve hole is formed in the second cavity, and a first spring fixedly connected with the main valve block is arranged in the first cavity; the valve rod is slidably connected with the valve hole, a plug block is arranged at the bottom, and a second spring fixedly connected with the main valve block is fixedly arranged at the top; the valve body communicates with a first pipeline and a second channel. And when no pressure difference exists between the first cavity and the second cavity, the main valve block is reset to the position where the communicating opening is opened by the blocking block under the action of the first spring. The vacuum drying device has the effect of reducing the probability that the liquid material is sucked into the vacuum pump in the vacuum drying process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid vacuum drying, in particular to an air filtering device for liquid drying and a vacuum drying box. BACKGROUND

[0002] Traditional Chinese medicine decocted liquid and part of medical liquid materials are processed by a vacuum drying process. Generally, the liquid materials are placed in a container, and then the container is placed in a vacuum drying box for vacuum drying treatment.

[0003] The operation process of using the vacuum drying box for vacuum drying is as follows: a, placing the container containing the liquid materials in the vacuum drying box and closing the box door; b, opening the vacuum drying box valve and then opening the vacuum pump to start vacuumizing; c, after the pressure gauge of the vacuum drying box reaches the required value, closing the vacuum drying box valve and closing the vacuum pump; d, setting the heating temperature and starting the vacuum heating box to heat and dry; e, opening the air release valve and opening the vacuum drying box door after the pressure is restored to take out the container.

[0004] Because the liquid materials will boil under vacuum negative pressure, liquid splashing phenomenon will occur, and part of the splashed liquid materials will enter the vacuum pump through the vacuumizing pipeline, which increases the probability of vacuum pump failure. Therefore, an air filter is generally connected to the vacuumizing pipeline to filter the dust and liquid materials sucked in. However, it is found in actual use that even if the air filter is connected, part of the liquid materials will still enter the vacuum pump. The reasons are as follows: 1. During the vacuum adsorption process, water vapor is continuously sucked into the vacuum pump; 2. The liquid materials intercepted by the vacuum filter will concentrate at the bottom of the air filter, and water vapor will be generated in the vacuum filter and sucked into the vacuum pump; 3. During the time from closing the vacuum drying box valve to closing the vacuum pump, the liquid materials at the bottom of the air filter will generate a large amount of bubbles and bubble breaking phenomenon due to the instantaneous increase of pressure, resulting in liquid splashing.

[0005] Therefore, how to reduce the probability of liquid materials being sucked into the vacuum pump without affecting the normal air suction of the vacuum pump is a difficult problem in the vacuum drying process of traditional Chinese medicine liquid and other liquid materials. SUMMARY

[0006] In order to improve the defect that the traditional Chinese medicine liquid and other liquid materials are easily sucked into the vacuum pump during the vacuum drying process, the present application provides an air filtering device for liquid drying and a vacuum drying box.

[0007] The air filtering device for liquid drying provided by the present application adopts the following technical scheme: An air filtering device for liquid drying, comprising The air filter body comprises an air inlet pipe and a negative pressure pipe, and is provided with a communication port for connecting the air inlet pipe and the negative pressure pipe; The valve body is installed on the air filter body and is internally provided with a main valve cavity; The main valve block is attached to and slides in the main valve cavity, and divides the main valve cavity into a first chamber and a second chamber. The second chamber is provided with a valve hole at the bottom for communicating with the negative pressure pipe. The first chamber is provided with a first spring fixedly connected with the main valve block; The valve rod is slidably connected with the valve hole, is provided with a plug at the bottom, and is provided with a second spring fixedly connected with the main valve block at the top; The valve body is provided with a first channel for connecting the first chamber with the negative pressure pipe, and is further provided with a second channel for connecting the air inlet pipe with the second chamber; Before the air inlet pipe is closed, the main valve block is compressed by the first spring due to the pressure difference. The second spring is in a stretched state; After the air inlet pipe is closed, the main valve block moves to a position where the plug closes the bottom of the communication port; When there is no pressure difference between the first chamber and the second chamber, the main valve block is reset to a position where the plug opens the communication port under the action of the first spring.

[0008] By adopting the above technical scheme, when the vacuum pump is running and the air inlet pipe is not closed, the air pressure of the air inlet pipe is greater than that of the negative pressure pipe, the air pressure of the second chamber is greater than that of the first chamber, and the pressure difference drives the main valve block to move to the first chamber and compress the first spring. The main valve block drives the valve rod to move through the second spring. After the air inlet pipe is closed, the main valve block moves to a position where the plug closes the bottom of the communication port, thereby intercepting the liquid in the air filter body, reducing the probability of the liquid in the air filter body entering the vacuum pump due to the instantaneous change of the pressure difference after the air inlet pipe is closed, and improving the protection of the vacuum pump.

[0009] Optionally, the valve body is provided with a secondary valve cavity, and a secondary valve block is attached to and slides in the secondary valve cavity. The secondary valve block divides the secondary valve cavity into a third chamber and a fourth chamber; The fourth chamber is provided with an adjusting hole for communicating with the second chamber. The secondary valve block is fixedly provided with an adjusting rod penetrating through the adjusting hole. The side wall of the valve rod is provided with a clamping groove. The third chamber is provided with a third spring fixedly connected with the secondary valve block, so that the adjusting rod is tightly abutted against the clamping groove; The valve body is connected with a first pipeline for connecting the first chamber with the third chamber. The first pipeline is located on the side wall of the first chamber. The end of the main valve block is fixedly provided with a closing plate. The closing plate is attached to the side wall of the first chamber. The closing plate is provided with an opening hole; The closing plate blocks the first pipeline. After the air inlet pipe is closed, the closing plate can move to a position where the opening hole is connected with the first pipeline; After the first pipeline is opened, the secondary valve block can move to a position where the adjusting rod is separated from the clamping groove.

[0010] By adopting the technical scheme, in the process that the main valve block moves to the first chamber, the valve rod is locked by the adjusting rod and cannot move, the sliding of the main valve block can make the second spring be in a stretched state, after the intake pipe is closed, the pressure difference can drive the main valve block to move to the position where the closing plate opens the first pipeline, at this time, the air pressure of the third chamber is less than that of the fourth chamber, which can drive the auxiliary valve block to move to the third chamber, after the adjusting rod is separated from the clamping groove, the valve rod will quickly move up under the action of the second spring, and then the blocking block can close the communication port. In this way, before the intake pipe is closed, the valve rod will not move, and the communication port remains unblocked, and only after the intake port is closed, the communication port is quickly closed, the corresponding speed of the air pressure change is improved, and the protection effect of the vacuum pump is improved.

[0011] Optionally, the valve body is provided with an adjusting valve chamber above the main valve chamber, the adjusting valve chamber is provided with a plug hole connected with the top end of the first chamber, the valve body is threadedly connected with an adjusting screw, the adjusting screw is located in the adjusting valve chamber, an end of the adjusting screw is fixedly provided with a plug plate slidingly matched with the inner wall of the plug hole, and the first spring is abutted against the plug plate.

[0012] By adopting the technical scheme, the position of the plug plate is adjusted by rotating the adjusting screw, and then the force required for the main valve block to move to the position where the first pipeline is opened is adjusted.

[0013] Optionally, the bottom end of the main valve block is provided with a stabilizing groove, and the top end of the valve rod is fixedly provided with a stabilizing rod which always abuts against and slides in the inner wall of the stabilizing groove.

[0014] By adopting the technical scheme, the setting of the stabilizing rod can effectively improve the stability of the sliding of the valve rod.

[0015] Optionally, the air filter body further comprises a top cover, a filter cartridge and an outer shell. The intake pipe and the negative pressure pipe are both mounted on the top cover, the bottom of the top cover is provided with an air inlet communicated with the intake pipe, and the filter cartridge is mounted on the bottom of the top cover to cover the air inlet. The top cover is provided with a communication chamber, the bottom of the top cover is provided with a partition hole communicated with the communication chamber, and the communication port is located at the top of the communication chamber and communicated with the negative pressure pipe. The outer shell is mounted on the bottom of the top cover to cover the filter cartridge and the partition hole.

[0016] By adopting the technical scheme, after the air passes through the intake pipe, it enters the filter cartridge through the air inlet and enters the outer shell through the filter cartridge, and in the process of passing through the filter cartridge, the dust, particles and liquid in the air are intercepted, and part of the liquid will drip to the bottom of the outer shell. The air in the outer shell enters the communication chamber through the partition hole and enters the vacuum pump through the negative pressure pipe to be discharged, so that the air extraction and filtration in the extraction process are realized.

[0017] Optionally, the filter cartridge bottom is fixedly provided with an intercepting cover, the intercepting cover is downwardly trumpet-shaped, and the intercepting cover is opposite to the bottom of the shell.

[0018] By adopting the technical scheme, the intercepting cover can effectively intercept the liquid material that is upwardly splashed from the bottom of the shell under the negative pressure state.

[0019] Optionally, the inner bottom wall of the shell is provided with a mounting frame, and a plurality of splash-proof plates are fixedly arranged on the mounting frame.

[0020] By adopting the technical scheme, the liquid material that drips from the filter cartridge falls on the splash-proof plates and drips along the splash-proof plates to the bottom of the shell for accumulation.

[0021] Optionally, the bottom of the shell is provided with a discharge hole, and a discharge plug is threadedly connected to the discharge hole.

[0022] By adopting the technical scheme, the liquid material at the bottom of the shell can be conveniently discharged through the discharge hole by opening the discharge plug.

[0023] Optionally, the filter cartridge comprises a cartridge shell and filter core pipes, the cartridge shell is mounted on the inner bottom wall of the top cover, the cartridge shell circumferential outer wall is a breathable mesh structure, and the cartridge shell is open at the upper end and the lower end; The filter core pipes are a plurality of pipes and are inserted into the cartridge shell, and the upper end and the lower end of each filter core pipe are curved and arranged in different rotation directions.

[0024] By adopting the technical scheme, the cartridge shell provides a basis for the installation of the filter core pipes.

[0025] The application also provides a vacuum drying box adopting the following technical scheme. The vacuum drying box comprises the air filtering device, a box body, and a vacuum pump. The box body is provided with a vacuum port for connecting the inside of the box body with the outside. The air inlet pipe is communicated with the vacuum port through a hose.

[0026] The application has at least one of the following beneficial technical effects. 1、In the intake pipe closed, by the pressure difference let main valve block moves and makes the second spring in the tensile state, after the intake pipe closed, the instantaneous pressure difference changes will make the main valve block continues to move and makes the first pipeline open, and then makes the secondary valve block moves, remove the fixed to the valve rod, the valve rod under the action of the second spring slip, and then make the block quickly closed communication, realized the intake pipe closed, the automatic closing of the negative pressure pipe, and then reduce the liquid material into the vacuum pump probability; 2、In the vacuum pump also closed, the first chamber, the second chamber, the third chamber and the fourth chamber of the same air pressure, the secondary valve block under the action of the third spring makes the adjusting rod and the valve rod abuts, the main valve block under the action of the first spring drives the main valve block reset, and then moves the valve rod to the position of the adjusting rod clamped in the card slot, realizes the automatic reset and locking of the valve rod position under normal pressure; 3、The filter core pipe in the filter cartridge is not only convenient to replace, but also can realize the effective filtration of the particles, dust and liquid material carried in the air under the premise of reducing air resistance, wherein the intercepted liquid material will be accumulated at the bottom of the shell, and the setting of the splash plate and the interception cover can effectively reduce the probability of the splashing liquid being sucked upward. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the embodiment of the application; Figure 2 is a structural schematic diagram of the air filter body; Figure 3 is a sectional view showing the air flow direction inside the air filter body; Figure 4 is a partial sectional view showing the initial state of the main valve block; Figure 5 is Figure 4 is an enlarged view of the card slot in part A; Figure 6 is a partial sectional view showing the first pipeline open state; Figure 7 is a partial sectional view showing the position of the main valve block before the intake pipe is closed; Figure 8 is a partial sectional view showing the position of the main valve block after the intake pipe is closed; Figure 9 is a partial sectional view showing the position of the secondary valve block after the first channel is opened; Figure 10 is a partial sectional view showing the internal structure of the filter cartridge; Figure 11 is a partial sectional exploded view showing the mounting relationship of the filter cartridge.

[0028] In the figure, 1, air filter body; 11, air inlet pipe; 12, negative pressure pipe; 13, top cover; 131, communication cavity; 1311, communication port; 132, air inlet; 133, grid hole; 134, protective fence; 14, filter cartridge; 141, cartridge shell; 1411, bottom plate; 1412, sleeve; 1413, protective mesh plate; 1414, middle rod; 1415, interception cover; 142, filter core pipe; 15, shell; 151, mounting frame; 1511, splash plate; 152, discharge hole; 1521, discharge plug; 2, valve body; 21, main valve cavity; 211, first chamber; 212, second chamber; 2121, valve hole; 213, first channel; 214, second channel; 215, first pipeline; 22, auxiliary valve cavity; 221, third chamber; 222, fourth chamber; 2221, adjusting hole; 23, adjusting valve chamber; 231, plug hole; 3, plugging assembly; 31, main valve block; 311, first spring; 312, second spring; 313, closing plate; 3131, opening hole; 314, stabilizing groove; 32, valve rod; 321, clamping groove; 322, blocking block; 323, stabilizing rod; 33, auxiliary valve block; 331, third spring; 34, adjusting rod; 4, adjusting assembly; 41, adjusting screw rod; 42, plug plate; 5, box body; 51, vacuum port. DETAILED DESCRIPTION

[0029] The following will be described in detail with reference to the accompanying drawings. Figures 1-11 The present application is further described in detail.

[0030] The present application discloses an air filtering device for liquid drying and a vacuum drying box. The following will be described starting from the vacuum drying box.

[0031] Reference Figure 1 And Figure 2 The vacuum drying box comprises a box body 5, a vacuum pump and an air filtering device. The air filtering device comprises an air filter body 1 and a valve body 2. In combination with Figure 3 The air filter body 1 comprises an air inlet pipe 11, a negative pressure pipe 12, a top cover 13, a filter cartridge 14 and a shell 15. The air inlet pipe 11 and the negative pressure pipe 12 are both mounted on the top cover 13, and the top cover 13 is provided with an air inlet 132 at the bottom for communicating with the air inlet pipe 11. The filter cartridge 14 is mounted at the bottom of the top cover 13, and the air inlet 132 is covered therein. The top cover 13 is provided with a communication cavity 131 inside, and the top wall of the communication cavity 131 is provided with a communication port 1311 for communicating with the bottom of the negative pressure pipe 12. The bottom of the top cover 13 is provided with a plurality of grid holes 133 for communicating with the communication cavity 131, which are distributed at equal intervals around the central axis of the top cover 13. The shell 15 is mounted at the bottom of the top cover 13, and the filter cartridge 14 and the grid holes 133 are both covered inside. The shell 15 is made of light-transmitting material, which is transparent plastic material in this embodiment, for facilitating observation.

[0032] The box 5 is provided with a vacuum port 51 for connecting the inside of the box 5 with the outside. The vacuum port 51 is provided with a valve for controlling the opening and closing of the vacuum port 51. The air inlet of the vacuum pump is connected with the negative pressure pipe 12 through a hose, and the air inlet pipe 11 is connected with the vacuum port 51 through a hose. When the valve of the vacuum port 51 is closed, the air inlet pipe 11 is in a closed state. The valve body 2 is fastened on the top of the top cover 13 by bolts, and the valve body 2 is provided with a plugging assembly 3 for plugging the communication port 1311 when the vacuum pump is running and the air inlet pipe 11 is closed.

[0033] The air in the box 5 is extracted by the vacuum pump. In this process, the air in the box 5 passes through the air inlet pipe 11 and the air inlet 132 in sequence and enters the filter cartridge 14, and the air is filtered during the process of passing through the filter cartridge 14. After the air passes through the filter cartridge 14, it flows to the partition hole 133 from the space formed by the filter cartridge 14 and the outer shell 15, and enters the communication cavity 131 through the partition hole 133. The air in the communication cavity 131 finally passes through the communication port 1311 and enters the negative pressure pipe 12, and then enters the vacuum pump. When the negative pressure state of the box 5 meets the requirements, the valve of the vacuum port 51 is closed, the air inlet pipe 11 is in a closed state, the communication port 1311 is plugged by the plugging assembly 3, thereby reducing the probability of the liquid in the outer shell 15 entering the vacuum pump due to boiling, and improving the protection effect on the vacuum pump.

[0034] Reference Figure 3 and Figure 4 The plugging assembly 3 includes a main valve block 31, a valve rod 32, a secondary valve block 33 and an adjusting rod 34. The valve body 2 is provided with a main valve cavity 21 above the communication port 1311, and the main valve block 31 is slidably arranged in the main valve cavity 21. The main valve block 31 divides the main valve cavity 21 into a first chamber 211 and a second chamber 212, wherein the first chamber 211 is located above the main valve block 31. The second chamber 212 is provided with a valve hole 2121 at the bottom for communicating with the negative pressure pipe 12, and the valve rod 32 is slidably connected with the valve hole 2121. The first spring 311 is fixed on the top of the main valve block 31, and the other end of the first spring 311 is abutted against the top wall in the first chamber 211. The second spring 312 is fixed on the bottom of the main valve block 31, and the other end of the second spring 312 is fixedly connected with the top of the valve rod 32. The main valve block 31 is provided with a stabilizing groove 314 at the bottom end, and the stabilizing rod 323 is fixedly arranged at the top end of the valve rod 32, and the stabilizing rod 323 is always located in the stabilizing groove 314 and slidably connected with the stabilizing groove 314. The valve rod 32 cannot be pulled out of the main valve cavity 21 through the valve hole 2121, and the plug 322 is fixedly arranged at the bottom end of the valve rod 32 and can close the bottom of the communication port 1311.

[0035] Reference Figure 4 and Figure 5The valve body 2 is provided with a first passage 213 for connecting the first chamber 211 with the negative pressure pipe 12, and the first passage 213 is partially located on the top cover 13. The valve body 2 is also provided with a second passage 214 for connecting the second chamber 212 with the air inlet pipe 11, and the second passage 214 is partially located on the top cover 13. The valve body 2 is further provided with a sub valve cavity 22, which is located on one side of the second chamber 212. A sub valve block 33 is attached to and slides in the sub valve cavity 22, and the sub valve block 33 horizontally slides and separates the sub valve cavity 22 into a third chamber 221 and a fourth chamber 222. The fourth chamber 222 is closer to the second chamber 212. The inner side wall of the fourth chamber 222 is provided with an adjusting hole 2221 for connecting with the second chamber 212, and an adjusting rod 34 is fixedly arranged on the sub valve block 33 and extends into the second chamber 212 from the adjusting hole 2221. The side wall of the third chamber 221 is fixedly provided with a third spring 331 on the side of the sub valve block 33, and the other end of the third spring 331 abuts against the inner wall of the third chamber 221. The side wall of the valve rod 32 is provided with a clamping groove 321 for inserting the adjusting rod 34 at the position opposite to the adjusting hole 2221.

[0036] When the pressure of the first chamber 211 and the second chamber 212 is the same, the first spring 311 is not in the stretched state, and the second spring 312 is not in the compressed state. At this time, the stabilizing rod 323 abuts against the inner top wall of the stabilizing groove 314, the main valve block 31 moves to the position where the adjusting rod 34 is located in the clamping groove 321, and the blocking block 322 is located at the position farthest from the communication port 1311.

[0037] When the pressure of the third chamber 221 and the fourth chamber 222 is the same, the third spring 331 will abut against the adjusting rod 34 in the clamping groove 321 through the sub valve block 33.

[0038] Reference Figure 6 The valve body 2 is provided with a first passage 213 for connecting the first chamber 211 with the negative pressure pipe 12, and the first passage 213 is partially located on the top cover 13. The valve body 2 is also provided with a second passage 214 for connecting the second chamber 212 with the air inlet pipe 11, and the second passage 214 is partially located on the top cover 13. The valve body 2 is further provided with a sub valve cavity 22, which is located on one side of the second chamber 212. A sub valve block 33 is attached to and slides in the sub valve cavity 22, and the sub valve block 33 horizontally slides and separates the sub valve cavity 22 into a third chamber 221 and a fourth chamber 222. The fourth chamber 222 is closer to the second chamber 212. The inner side wall of the fourth chamber 222 is provided with an adjusting hole 2221 for connecting with the second chamber 212, and an adjusting rod 34 is fixedly arranged on the sub valve block 33 and extends into the second chamber 212 from the adjusting hole 2221. The side wall of the third chamber 221 is fixedly provided with a third spring 331 on the side of the sub valve block 33, and the other end of the third spring 331 abuts against the inner wall of the third chamber 221. The side wall of the valve rod 32 is provided with a clamping groove 321 for inserting the adjusting rod 34 at the position opposite to the adjusting hole 2221.

[0039] Reference Figure 7 When the vacuum pump is working and the air inlet pipe 11 is not closed, the pressure difference between the first chamber 211 and the second chamber 212 is sufficient to move the main valve block 31 upward. The main valve block 31 will compress the first spring 311 and stretch the second spring 312 during the upward movement, and in this process, the first pipe 215 is closed by the closing plate 313, and the adjusting rod 34 is located in the adjusting groove.

[0040] Reference Figure 8 and Figure 9, When the vacuum pump works and the inlet pipe 11 is closed, the pressure of the negative pressure pipe 12 tends to be vacuum, the pressure instantaneously decreases, and the pressure difference between the first chamber 211 and the second chamber 212 drives the main valve block 31 to continue to move upwards, and drives the closing plate 313 to move to a position where the opening hole 3131 is in communication with the first pipeline 215, so as to open the first pipeline 215. After the first pipeline 215 is opened, the pressure difference between the third chamber 221 and the fourth chamber 222 drives the auxiliary valve block 33 to move towards the third chamber 221, so as to compress the third spring 331 and make the adjusting rod 34 disengage from the clamping groove 321. Since the valve rod 32 loses the locking of the adjusting rod 34, the valve rod 32 will be quickly moved upwards to the position where the blocking block 322 closes the communication port 1311 under the action of the pulling force of the second spring 312, and remains in the tension state.

[0041] Reference Figure 4 When the vacuum pump stops working, the pressures of the first chamber 211, the second chamber 212, the third chamber 221 and the fourth chamber 222 are the same, the third spring 331 abuts against the inner wall of the valve rod 32 with the adjusting rod 34, the main valve block 31 moves downwards under the action of the first spring 311 and the second spring 312, and then drives the valve rod 32 to move downwards, so as to open the communication port 1311. After the valve rod 32 moves to the position where the adjusting rod 34 re-engages in the clamping groove 321, the valve rod 32 stops moving, so as to reset and re-lock the position of the valve rod 32.

[0042] In this way, the locked state of the valve rod 32 can be utilized, the second spring 312 is stretched and stored energy by the upward movement of the main valve block 31, and then the main valve block 31 can be quickly moved to the state of opening the first pipeline 215 after the inlet pipe 11 is closed, the auxiliary valve block 33 is quickly moved correspondingly, the valve rod 32 is quickly pulled upwards at the moment when the adjusting rod 34 disengages from the clamping groove 321, and the communication port 1311 is quickly closed. After the inlet pipe 11 is closed, the liquid in the shell 15 will also be partially boiled due to the decrease of the pressure, so as to cause splashing of the liquid. The liquid entering the vacuum pump can be reduced by quickly closing the communication port 1311, and the protection effect on the vacuum pump is improved. The first spring 311, the second spring 312 and the third spring 331 are AISI316 stainless steel materials.

[0043] Reference Figure 4The valve body 2 is further provided with an adjusting assembly 4 for adjusting the pushing force required for the main valve block 31 to move to the open position of the first pipeline 215. The adjusting assembly 4 comprises an adjusting screw 41 and a plug plate 42. An adjusting valve chamber 23 is formed in the valve body 2 and is located above the main valve cavity 21. The adjusting valve chamber 23 is provided with a plug hole 231 connected to the top end of the first cavity 211. The adjusting screw 41 is threadedly connected to the valve body 2 and is located in the adjusting valve chamber 23. The plug plate 42 is fixedly arranged at the end of the adjusting screw 41 and is in sliding fit with the inner wall of the plug hole 231 to close the plug hole 231. The first spring 311 is in abutting fit with the plug plate 42. The position of the plug plate 42 is adjusted by rotating the adjusting screw 41, so as to adjust the force required for the main valve block 31 to move to the position where the open hole 3131 is in communication with the first pipeline 215.

[0044] With reference to Figure 10 and Figure 11 The filter cartridge 14 comprises a cartridge shell 141 and filter core pipes 142. The cartridge shell 141 is threadedly mounted on the inner bottom wall of the top cover 13, and the circumferential outer wall of the cartridge shell 141 is a breathable metal mesh structure. The filter core pipes 142 are a plurality of polyester fiber materials in this embodiment. The cartridge shell 141 is open at both the top and bottom ends, and a center rod 1414 is arranged in the center of the cartridge shell 141. A bottom plate 1411 is mounted on the bottom of the filter cartridge 14 by bolts and is mounted on the center rod 1414. The bottom plate 1411 is a frame structure, and protective mesh plates 1413 are mounted on the top of the bottom plate 1411 and the top of the cartridge shell 141. A plurality of sleeves 1412 are mounted on the protective mesh plates 1413 for inserting and fixing the filter core pipes 142.

[0045] When installing the filter core pipes 142, one end of each filter core pipe 142 is inserted and fixed on the sleeve 1412 in the cartridge shell 141, and then the bottom plate 1411 is buckled, so that the sleeve 1412 of the bottom plate 1411 is inserted into the corresponding filter core pipe 142. Then, the bottom plate 1411 is rotated to drive the plurality of filter core pipes 142 to twist through the sleeves 1412, so that the filter core pipes 142 are bent to rotate in different directions at the top and bottom ends. Then, the bottom plate 1411 is fastened on the center rod 1414 by bolts. In this way, the filter core pipes 142 are not only convenient to disassemble and replace, but also make the air fully contact with the inner wall of the filter core pipes 142 during the process of passing through the filter core pipes 142, thereby improving the air filtration effect.

[0046] The circumferential outer wall bottom of the cylinder shell 141 is fixedly provided with an interception cover 1415 made of rubber and in the shape of a downward trumpet. The bottom of the outer shell 15 is in the shape of a downward circular arc. The inner bottom wall of the outer shell 15 is provided with a mounting rack 151, and the mounting rack 151 is fixedly provided with a plurality of splash plates 1511. The splash plates 1511 are ring plates and are arranged downwardly in a direction away from the central axis of the outer shell 15. The radii of the plurality of splash plates 1511 are different, and the closer to the central axis of the outer shell 15, the smaller the radius and the higher the installation height. The bottom of the outer shell 15 is provided with a discharge hole 152, and the discharge hole 152 is threadedly connected with a discharge plug 1521. The inner top wall of the top cover 13 is further fixedly provided with a protective fence 134, and the grid hole 133 is located outside the space surrounded by the protective fence 134. After the filter cartridge 14 is installed, it is located in the protective fence 134, and the protective fence 134 is made of rubber.

[0047] During the process of air passing through the filter cartridge 14, dust, particles and liquid materials in the air are intercepted by the filter core pipe 142, and the liquid materials drop onto the splash plates 1511 below and then fall along the splash plates 1511 to the inner bottom wall of the outer shell 15. The distribution and layout of the splash plates 1511 not only facilitate the drainage of the liquid materials to the bottom of the outer shell 15, but also intercept the splashing of the liquid materials accumulated at the bottom of the outer shell 15. If the liquid materials in the outer shell 15 are accumulated too much, the liquid materials in the outer shell 15 can be discharged by opening the discharge plug 1521. The interception cover 1415 can further intercept the liquid materials splashing from the splash plates 1511, further improving the protection effect of the vacuum pump. The protective fence 134 can effectively reduce the probability of air flowing directly through the cylinder shell 141 to the grid hole 133 and can also intercept the liquid materials and water vapor passing through the cylinder shell 141.

[0048] In the embodiment, the first spring The implementation principle of the air filtering device for drying liquid medicine and the vacuum drying box is as follows: during the process of vacuumizing the box body 5, air enters the filter cartridge 14 through the air inlet pipe 11. The air is filtered and intercepted by the filter cartridge 14 to remove dust, particles and liquid materials therefrom, and the liquid materials drop to the bottom of the outer shell 15. After the air passes through the filter cartridge 14, it enters the negative pressure pipe 12 from the communication cavity 131 and then enters the vacuum pump.

[0049] The air pressure of the negative pressure pipe 12 is less than that of the air inlet pipe 11, so that the air pressure of the first chamber 211 is less than that of the second chamber 212, and the main valve block 31 moves upward to stretch the second spring 312. The main valve block 31 moves to a balanced position.

[0050] After the air inlet pipe 11 is closed, the air pressure of the air inlet pipe 11 is initially the same as the air pressure in the box 5, the air pressure of the negative pressure pipe 12 is infinitely close to the negative pressure, and then the air pressure of the first chamber 211 is suddenly reduced, so that the main valve block 31 continues to move upward to the position of opening the first pipe 215. Because the first pipe 215 is opened, the air pressure of the third chamber 221 is less than that of the fourth chamber 222, the auxiliary valve block 33 drives the adjusting rod 34 to move to the position of being separated from the clamping groove 321, and then the valve rod 32 is quickly moved upward under the action of the second spring 312, the plug closes the communication port 1311, and the quick response of closing the negative pressure pipe 12 is realized.

[0051] Because the air pressure in the shell 15 will quickly decrease after the air inlet pipe 11 is closed, the liquid material accumulated at the bottom of the shell 15 will produce the phenomenon of boiling and splashing, the splash-proof plate 1511 and the interception cover 1415 play the role of intercepting the splashed liquid material, and because the negative pressure pipe 12 is automatically closed, the probability of the liquid material being sucked into the vacuum pump can be further reduced, and the protection effect on the vacuum pump is improved.

[0052] The embodiments of the specific embodiment are the preferred embodiments of the application, and are not intended to limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. An air filtration device for drying liquid medicine, characterized in that: include The air filter body (1) comprises an air inlet pipe (11) and a negative pressure pipe (12); the air filter body (1) is provided with a communication port (1311) for connecting the air inlet pipe (11) and the negative pressure pipe (12); The valve body (2) is mounted on the air filter body (1) and has a main valve chamber (21) formed therein; The main valve block (31) is fitted and slidably mounted in the main valve cavity (21), dividing the main valve cavity (21) into a first chamber (211) and a second chamber (212). The bottom of the second chamber (212) is provided with a valve hole (2121) connected to the negative pressure pipe (12). The first chamber (211) is provided with a first spring (311) fixedly connected to the main valve block (31). The valve stem (32) is slidably connected to the valve hole (2121), a blocking block (322) is provided at the bottom, and a second spring (312) fixedly connected to the main valve block (31) is fixed at the top; The valve body (2) is provided with a first passage (213) for communicating the first chamber (211) and the negative pressure pipe (12), and is also provided with a second passage (214) for communicating the air inlet pipe (11) and the second chamber (212). Before the air inlet pipe (11) is closed, the main valve block (31) compresses the first spring (311) due to the pressure difference, and the second spring (312) is in a stretched state; After the air inlet pipe (11) is closed, the main valve block (31) moves to a position where the blocking block (322) seals the bottom of the communication port (1311); When there is no pressure difference between the first chamber (211) and the second chamber (212), the main valve block (31) is reset to a position where the blocking block (322) opens the communication port (1311) under the action of the first spring (311).

2. The air filter device for drying liquid medicine according to claim 1, characterized in that: The valve body (2) is provided with an auxiliary valve chamber (22), and an auxiliary valve block (33) is slidingly fitted in the auxiliary valve chamber (22). The auxiliary valve block (33) divides the auxiliary valve chamber (22) into a third chamber (221) and a fourth chamber (222). The fourth chamber (222) is provided with an adjusting hole (2221) communicating with the second chamber (212); the auxiliary valve block (33) is fixedly provided with an adjusting rod (34) passing through the adjusting hole (2221); a clamping groove (321) is provided on the side wall of the valve rod (32); and the third chamber (221) is provided with a third spring (331) fixedly connected to the auxiliary valve block (33) so that the adjusting rod (34) and the clamping groove (321) are tightly pressed against each other. The valve body (2) is connected to a first pipe (215) for connecting the first chamber (211) and the third chamber (221). The first pipe (215) is located on the side wall of the first chamber (211). A closing plate (313) is fixed to the end of the main valve block (31). The closing plate (313) is in contact with the side wall of the first chamber (211). The closing plate (313) is provided with an opening hole (3131). The closing plate (313) blocks the first pipe (215). Only after the air inlet pipe (11) is closed can the closing plate (313) be moved to a position where the opening hole (3131) is in communication with the first pipe (215). After the first pipeline (215) is opened, the auxiliary valve block (33) can move to a position where the regulating rod (34) is disengaged from the clamping groove (321).

3. The air filter device for drying liquid medicine according to claim 2, characterized in that: The valve body (2) is provided with a regulating valve chamber (23) above the main valve cavity (21). The regulating valve chamber (23) is provided with a plug hole (231) connected to the top of the first cavity (211). The valve body (2) is threadedly connected with an adjusting screw (41). The adjusting screw (41) is located in the regulating valve chamber (23). The end of the adjusting screw (41) is fixed with a plug plate (42) that fits and slides with the inner wall of the plug hole (231). The first spring (311) is tightly pressed against the plug plate (42).

4. The air filter device for drying liquid medicine according to claim 1, characterized in that: A stabilizing groove (314) is provided at the bottom end of the main valve block (31), and a stabilizing rod (323) is fixedly provided at the top end of the valve stem (32). The stabilizing rod (323) always abuts against and slides against the inner wall of the stabilizing groove (314).

5. The air filter device for drying liquid medicine according to claim 1, characterized in that: The air filter body (1) further comprises a top cover (13), a filter cartridge (14) and a housing (15); The air inlet pipe (11) and the negative pressure pipe (12) are both installed on the top cover (13). The bottom of the top cover (13) is provided with an air inlet (132) communicating with the air inlet pipe (11). The filter cartridge (14) is installed at the bottom of the top cover (13) to cover the air inlet (132). A communication cavity (131) is provided in the top cover (13), a grid hole (133) communicating with the communication cavity (131) is provided at the bottom of the top cover (13), and a communication port (1311) is located at the top of the communication cavity (131) and communicates with the negative pressure tube (12); The outer shell (15) is installed at the bottom of the top cover (13) and covers the filter cartridge (14) and the grid holes (133) inside.

6. The air filter device for drying liquid medicine according to claim 5, characterized in that: An interception cover (1415) is fixedly provided at the bottom of the filter cartridge (14). The interception cover (1415) is in a downward trumpet shape and is directly opposite to the bottom of the shell (15).

7. The air filtration device for liquid medicine drying according to claim 5, characterized in that: The inner bottom wall of the housing (15) is provided with a mounting frame (151), and a plurality of splash plates (1511) are fixedly provided on the mounting frame (151). Liquid material falling on the splash plates (1511) will flow to the inner bottom wall of the housing (15).

8. The air filter device for drying liquid medicine according to claim 7, characterized in that: A discharge hole (152) is provided at the bottom of the housing (15), and a discharge plug (1521) is threadedly connected to the discharge hole (152).

9. The air filter device for drying liquid medicine according to claim 5, characterized in that: The filter cartridge (14) comprises a cartridge shell (141) and a filter core tube (142). The cartridge shell (141) is mounted on the inner bottom wall of the top cover (13). The circumferential outer wall of the cartridge shell (141) is a breathable mesh structure. The cartridge shell (141) is provided with openings at both upper and lower ends. There are multiple filter core tubes (142) inserted into the cylindrical shell (141), with upper and lower ends bent in different rotation directions.

10. A vacuum drying oven comprising the air filter device according to any one of claims 1 to 9, characterized in that: It also includes a box (5) and a vacuum pump, wherein the air inlet of the vacuum pump is connected to the negative pressure pipe (12) through a hose; The box body (5) is provided with a vacuum port (51) for communicating the interior with the outside world, and the vacuum port (51) is provided with a valve; The air inlet pipe (11) is communicated with the vacuum port (51) through a hose.

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