Chemical conveying system

Abstract

The utility model provides a chemical conveying system, and belongs to the technical field of chemical manufacturing. The chemical conveying system comprises a chemical conveying device and a filtering device. A ventilation opening is formed in the top of the chemical conveying device, and a chemical storage tank is installed in the chemical conveying device. The filtering device comprises a power unit and a filtering unit, and the power unit is located outside the chemical conveying device, corresponds to the ventilation opening in position and is used for providing airflow into the chemical conveying device; the filtering unit is located in the chemical conveying device, corresponds to the ventilation opening in position and is used for purifying airflow, the filtering cotton in the filtering unit can be taken out, and the chemical conveying system can effectively solve the problems that the filtering cotton is inconvenient to replace and unsafe.

Description

Technical Field

[0001] This application relates to the technical field of chemical manufacturing, and more particularly, to a chemical transfer system. Background Art

[0002] In the prior art, after a chemical transfer device has been used for a period of time, due to the exhaustion of the material, it is necessary to regularly replace the storage tank in the chemical transfer device. During the replacement process, toxic gases are likely to be generated due to material leakage and volatilization. Therefore, a filtering device is usually provided at the ventilation opening of the chemical transfer device to provide clean fresh air into the transfer device during the replacement process, so as to remove harmful gases through the internal air flow channel of the transfer device. Currently, when installing the filtering device, the filtering device is usually installed as a whole outside the chemical transfer device and above the ventilation opening, and its filtering unit is squeezed between the power unit and the chemical transfer device. Considering the cleanliness of the fresh air, it is necessary to regularly replace the filter cotton in the filtering unit. However, for the currently configured filtering device to replace the filter cotton, it is necessary to first move the power unit at the top. Since the power unit is relatively heavy, there are problems of inconvenient and unsafe replacement of the filter cotton. Utility Model Content

[0003] The purpose of this application is to provide a chemical transfer system that can effectively solve the problems of inconvenient and unsafe replacement of filter cotton.

[0004] The embodiments of this application are implemented as follows:

[0005] The embodiments of this application provide a chemical transfer system, including a chemical transfer device and a filtering device. A ventilation opening is provided at the top of the chemical transfer device, and a chemical storage tank is installed inside the chemical transfer device; the filtering device includes a power unit and a filtering unit. The power unit is located outside the chemical transfer device and corresponds to the position of the ventilation opening, and is used to provide air flow into the chemical transfer device; the filtering unit is located inside the chemical transfer device and corresponds to the position of the ventilation opening, and is used to purify the air flow, and the filter cotton in the filtering unit can be taken out.

[0006] In the above technical solution, the power unit and the filtering unit in the filtering device are separately arranged. Specifically, the power unit is arranged outside the chemical transfer device and corresponds to the ventilation opening, and the filtering unit is arranged inside the chemical transfer device and corresponds to the ventilation opening. That is, on the premise of ensuring the normal operation of the filtering device, the filtering unit is separately installed inside the chemical transfer device, so that it is not necessary to first move the relatively heavy power unit during the process of replacing the filter cotton, and thus the problems of inconvenient and unsafe replacement of the filter cotton can be effectively solved.

[0007] In some alternative embodiments, the filtering unit includes a filter cotton, a mounting seat, and a ventilation plate. The mounting seat is provided with an air flow channel and is connected to the inner wall of the top of the chemical transmission device. The first opening at one end of the air flow channel communicates with the ventilation opening, and the second opening at the other end communicates with the chamber inside the chemical transmission device, for delivering air flow into the chemical transmission device. The filter cotton is accommodated in the air flow channel for purifying the air flow. The ventilation plate is detachably connected to the side of the mounting seat where the second opening is provided, for replacing the filter cotton.

[0008] In the above technical solution, the filtering unit is set in the form of cooperation among the filter cotton, the mounting seat, and the ventilation plate. Specifically, the mounting seat is provided with an air flow channel and is connected to the inner wall of the top of the chemical transmission device. The filter cotton is accommodated in the air flow channel, and the ventilation plate is detachably connected to the side of the mounting seat where the second opening is provided. This form of filtering unit can stably install the filter cotton in the chemical transmission device while normally playing the role of air flow purification. At the same time, it also has the advantages of simple structure and convenient assembly.

[0009] In some alternative embodiments, the bottom of the mounting seat is provided with a second opening, and the ventilation plate is detachably connected to the bottom of the mounting seat.

[0010] In the above technical solution, the second opening is provided at the bottom of the mounting seat so that the ventilation plate is detachably connected to the bottom of the mounting seat, which is convenient for arranging the filtering unit in the chemical transmission device with limited horizontal space. At the same time, the form of the bottom opening is also convenient for replacing the filter cotton.

[0011] In some alternative embodiments, the mounting seat includes an annular side plate with through upper and lower ends and an air flow channel inside, an upward flanging extending inward at the upper end of the annular side plate, and a downward flanging extending inward at the lower end of the annular side plate. The upward flanging is connected to the inner wall of the top of the chemical transmission device, and the downward flanging is detachably connected to the ventilation plate.

[0012] In the above technical solution, the mounting seat is set in a specific form of cooperation among the upward flanging, the downward flanging, and the annular side plate with through upper and lower ends and an air flow channel inside. On the one hand, the setting of the upward flanging can increase the contact area between the mounting seat and the inner wall of the top of the chemical transmission device, thereby improving the connection stability between the two. On the other hand, the setting of the downward flanging can provide a relatively large connection area, which is convenient for connecting the mounting seat and the ventilation plate.

[0013] In some alternative embodiments, the filtering unit further includes a plurality of clamping blocks, and each clamping block is rotatably connected to the downward flanging so that each clamping block has a first state and a second state. When the clamping block is in the first state, at least part of the clamping block is located directly below the second opening to support the filter cotton; when the clamping block is in the second state, the clamping block is not located directly below the second opening.

[0014] In the above technical solution, when the second opening is provided at the bottom of the mounting base, the filter unit is further provided with a clamping block, and the clamping position has a first state capable of supporting the filter cotton and a second state not supporting the filter cotton. Specifically, during the process of replacing the filter cotton, when the ventilation plate is removed or before the ventilation plate is installed, the setting of the clamping block can prevent the filter cotton from falling directly, thus facilitating the operation of technicians.

[0015] In some alternative embodiments, the clamping block includes a supporting portion and a mounting portion that are fixedly connected to form a Z-shape. The mounting portion is rotatably connected to the downwardly turned edge so that the supporting portion can be rotated to the first state or the second state.

[0016] In the above technical solution, the clamping block is set in the form of a combination of a supporting portion and a mounting portion that are fixedly connected to form a Z-shape. Specifically, the mounting portion is used to be rotatably connected to the downwardly turned edge so that the supporting portion can be rotated to the first state or the second state. This form of clamping block has the advantages of being easy to toggle and easy to connect to the downwardly turned edge.

[0017] In some alternative embodiments, the ventilation plate includes a connection area at the circumferential edge and a ventilation area within the connection area. The connection area is detachably connected to the downwardly turned edge, and the ventilation area is provided with a plurality of ventilation holes distributed in an array.

[0018] In the above technical solution, the connection area of the ventilation plate is provided at the circumferential edge, the ventilation area is provided within the connection area, and a plurality of ventilation holes are provided in the ventilation area and distributed in an array. This form of ventilation plate has the advantages of being able to stably connect to the downwardly turned edge, having a relatively smooth air flow transportation, and good air outlet uniformity.

[0019] In some alternative embodiments, the connection area is provided with a plurality of mounting holes, and each mounting hole is correspondingly provided with a connecting member. The connecting member passes through the corresponding mounting hole and is configured not to fall off from the connection area. One end of the connecting member is detachably connected to the downwardly turned edge.

[0020] In the above technical solution, the specific form that the connecting member passes through the mounting hole and is configured not to fall off from the connection area can effectively prevent the connecting member from falling during the process of disassembling the ventilation plate.

[0021] In some alternative embodiments, the connecting member includes a nut, a screw rod section, and a threaded section that are connected in sequence. The screw rod section passes through the mounting hole, and the sizes of the nut and the threaded section are both larger than the aperture of the mounting hole so that the connecting member will not fall off from the connection area. The threaded section is threadedly connected to the downwardly turned edge.

[0022] In the above technical solution, the connecting member is set in the form of a nut, a screw rod section and a threaded section. Specifically, the screw rod section is passed through the mounting hole, and neither the nut nor the threaded section will fall off from the connection area. The threaded section is threadedly connected to the downward flanging, which has the advantages of relatively simple overall structure and convenient for manual operation.

[0023] In some alternative embodiments, the ventilation opening is located above the storage tank.

[0024] In the above technical solution, the ventilation opening is opened above the storage tank. When the filtering device is operating normally and delivering fresh air to the chemical transmission device, it can more effectively remove the harmful gases inside the chemical transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic distribution diagram of the filtering device provided by the embodiment of the present application in the chemical transmission device;

[0027] Figure 2 A schematic cross-sectional view of a combination of filtering units provided by the embodiment of the present application;

[0028] Figure 3 For Figure 2 a schematic structural diagram of the filtering unit after disassembly in

[0029] Figure 4 A schematic structural diagram of a mounting seat provided by the embodiment of the present application;

[0030] Figure 5 A schematic structural diagram of a clamping block provided by the embodiment of the present application;

[0031] Figure 6 A schematic structural diagram of a ventilation plate provided by the embodiment of the present application;

[0032] Figure 7 A schematic structural diagram of a connecting member provided by the embodiment of the present application;

[0033] Figure 8 For Figure 4 a partial enlarged view of part A in

[0034] Icons: 10 - Chemical transfer system; 100 - Chemical transfer device; 110 - Vent; 120 - Chemical storage tank; 200 - Filter device; 210 - Power unit; 220 - Filter unit; 221 - Filter cotton; 222 - Mounting seat; 2221 - Ring-shaped side plate; 2222 - Upper flanging; 2223 - Lower flanging; 2224 - Air flow channel; 2225 - First opening; 2226 - Second opening; 223 - Ventilation plate; 2231 - Connection area; 2231a - Mounting hole; 2231b - Connector; 2232 - Ventilation area; 2232a - Ventilation hole; 224 - Clamping block; 2241 - Support part; 2242 - Mounting part. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application that is claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0037] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0039] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not require the components to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] The following specifically describes a chemical transmission system of the present application.

[0042] Refer to Figure 1 , an embodiment of the present application provides a chemical transmission system 10, including a chemical transmission device 100 and a filtering device 200. A ventilation opening 110 is provided at the top of the chemical transmission device 100, and a chemical storage tank 120 is installed inside the chemical transmission device 100; the filtering device 200 includes a power unit 210 and a filtering unit 220. The power unit 210 is located outside the chemical transmission device 100 and corresponds to the position of the ventilation opening 110, and is used to provide air flow into the chemical transmission device 100; the filtering unit 220 is located inside the chemical transmission device 100 and corresponds to the position of the ventilation opening 110, and is used to purify the air flow, and the filter cotton 221 in the filtering unit 220 can be taken out.

[0043] In the present application, the power unit 210 and the filtering unit 220 in the filtering device 200 are separately arranged. Specifically, the power unit 210 is arranged outside the chemical transmission device 100 and corresponds to the ventilation opening 110, and the filtering unit 220 is arranged inside the chemical transmission device 100 and corresponds to the ventilation opening 110. That is, on the premise of ensuring the normal operation of the filtering device 200, the filtering unit 220 is separately installed inside the chemical transmission device 100, so that the relatively heavy power unit 210 does not need to be moved first during the process of replacing the filter cotton 221, and thus the problems of inconvenient replacement and insecurity of the filter cotton 221 can be effectively solved.

[0044] Refer to Figure 1 , as an example, the ventilation opening 110 is located above the storage tank.

[0045] In this embodiment, the ventilation opening 110 is provided above the storage tank. When the filtering device 200 operates normally to supply fresh air to the chemical transmission device 100, harmful gases inside the chemical transmission device 100 can be more effectively removed.

[0046] In other possible embodiments, the ventilation opening 110 can also be provided in the area above a non-storage tank.

[0047] Refer to Figure 2 and Figure 3 , as an example, the filtering unit 220 includes a filter cotton 221, a mounting seat 222, and a ventilation plate 223. The mounting seat 222 is provided with an air flow channel 2224 and is connected to the top inner wall of the chemical transmission device 100. The first opening 2225 at one end of the air flow channel 2224 communicates with the ventilation opening 110, and the second opening 2226 at the other end communicates with the chamber inside the chemical transmission device 100 for delivering air flow into the chemical transmission device 100. The filter cotton 221 is accommodated in the air flow channel 2224 for purifying the air flow. The ventilation plate 223 is detachably connected to the side of the mounting seat 222 where the second opening 2226 is provided for replacing the filter cotton 221.

[0048] In this embodiment, the filtering unit 220 is set in the form of cooperation among the filter cotton 221, the mounting seat 222, and the ventilation plate 223. Specifically, the mounting seat 222 is provided with an air flow channel 2224 and is connected to the top inner wall of the chemical transmission device 100. The filter cotton 221 is accommodated in the air flow channel 2224, and the ventilation plate 223 is detachably connected to the side of the mounting seat 222 where the second opening 2226 is provided. This form of filtering unit 220 can stably install the filter cotton 221 inside the chemical transmission device 100 while normally playing the role of air flow purification. At the same time, it also has the advantages of simple structure and convenient assembly.

[0049] It should be noted that the specific position where the second opening 2226 is provided is not limited. For example, it can be the bottom of the mounting seat 222 or the side wall of the mounting seat 222, and can be specifically adjusted according to actual needs.

[0050] Refer to Figure 4 , as an example, the bottom of the mounting seat 222 is provided with the second opening 2226, and the ventilation plate 223 is detachably connected to the bottom of the mounting seat 222.

[0051] In this embodiment, the second opening 2226 is provided at the bottom of the mounting seat 222 so that the ventilation plate 223 is detachably connected to the bottom of the mounting seat 222, which is convenient for setting the filtering unit 220 inside the chemical transmission device 100 where the horizontal space is relatively limited. At the same time, the form of the bottom opening is also convenient for replacing the filter cotton 221.

[0052] Referring to Figure 4 , as an example, the mounting base 222 includes an annular side plate 2221 with through upper and lower ends and an air flow channel 2224 inside, an upward flanging 2222 extending inwardly at the upper end of the annular side plate 2221, and a downward flanging 2223 extending inwardly at the lower end of the annular side plate 2221. The upward flanging 2222 is connected to the top inner wall of the chemical transfer device 100, and the downward flanging 2223 is detachably connected to the ventilation plate 223.

[0053] In this embodiment, the mounting base 222 is set in a specific form in which the upward flanging 2222, the downward flanging 2223, and the annular side plate 2221 with through upper and lower ends and an air flow channel 2224 inside cooperate with each other. On the one hand, the setting of the upward flanging 2222 can increase the contact area between the mounting base 222 and the top inner wall of the chemical transfer device 100, thereby improving the connection stability between the two. On the other hand, the setting of the downward flanging 2223 can provide a relatively large connection area 2231, thereby facilitating the connection between the mounting base 222 and the ventilation plate 223.

[0054] Referring to Figure 2 and Figure 3 , as an example, the filtering unit 220 further includes a plurality of clamping blocks 224, and each clamping block 224 is rotatably connected to the downward flanging 2223 so that each clamping block 224 has a first state and a second state. When the clamping block 224 is in the first state, at least part of the clamping block 224 is located directly below the second opening 2226 to support the filter cotton 221; when the clamping block 224 is in the second state, the clamping block 224 is not located directly below the second opening 2226.

[0055] In this embodiment, when the second opening 2226 is opened at the bottom of the mounting base 222, the filtering unit 220 is further provided with clamping blocks 224, and the positions have a first state capable of supporting the filter cotton 221 and a second state not supporting the filter cotton 221. Specifically, during the process of replacing the filter cotton 221, when the ventilation plate 223 is removed or before the ventilation plate 223 is installed, the setting of the clamping blocks 224 can prevent the filter cotton 221 from falling directly, thereby facilitating the operation of technicians.

[0056] To better understand the technical solution, the following is an auxiliary description in combination with the specific replacement process of the filter cotton 221: When the filter cotton 221 in the filter device 200 needs to be replaced, first, the ventilation plate 223 is detached from the lower flanging 2223. At this time, the clamping block 224 is in the first state to support the filter cotton 221 so that it will not fall off; then, by rotating the clamping block 224, it is changed from the first state to the second state, so that the old filter cotton 221 falls off; then, a new filter cotton 221 is placed, and by rotating the clamping block 224, it is changed from the second state to the first state, thereby realizing the installation of the new filter cotton 221; finally, the ventilation plate 223 is connected to the lower flanging 2223 again.

[0057] It should be noted that the form in which the clamping block 224 is rotatable on the upper side of the lower flanging 2223 is not limited and can be set according to the conventional selection in the art. For example, the clamping block 224 can be rotatably connected to the lower flanging 2223 through a fixing rod. Specifically, the fixing rod is connected to and protrudes from the inner wall of the lower flanging 2223, and the clamping block 224 is provided with a fixing hole that can be rotatably matched with the outer peripheral wall of the rod body of the fixing rod.

[0058] It should be noted that the specific structure of the clamping block 224 is not limited and can be adjusted according to actual needs.

[0059] Refer to Figure 5 , as an example, the clamping block 224 includes a support portion 2241 and an installation portion 2242 that are fixedly connected to each other to form a Z shape. The installation portion 2242 is rotatably connected to the lower flanging 2223 so that the support portion 2241 can be rotated to the first state or the second state.

[0060] In this embodiment, the clamping block 224 is set in the form of a combination of a support portion 2241 and an installation portion 2242 that are fixedly connected to each other to form a Z shape. Specifically, the installation portion 2242 is used to be rotatably connected to the lower flanging 2223 so that the support portion 2241 can be rotated to the first state or the second state. The clamping block 224 in this form has the advantages of being easy to toggle and easy to connect to the lower flanging 2223.

[0061] Refer to Figure 6 , as an example, the ventilation plate 223 includes a connection area 2231 located at the circumferential edge and a ventilation area 2232 located within the connection area 2231. The connection area 2231 is detachably connected to the lower flanging 2223, and the ventilation area 2232 is provided with a plurality of ventilation holes 2232a distributed in an array.

[0062] In this embodiment, the connection area 2231 of the ventilation plate 223 is arranged at the circumferential edge, the ventilation area 2232 is arranged within the connection area 2231, and a plurality of ventilation holes distributed in an array are formed in the ventilation area 2232. The ventilation plate 223 in this form has the advantages of being able to stably connect with the downward flanging 2223, smooth air flow transportation, and good air outlet uniformity.

[0063] Refer to Figure 6 , as an example, a handle is installed on the side of the ventilation plate 223 facing away from the downward flanging 2223.

[0064] In this embodiment, a handle is added to the ventilation plate 223, which is convenient for technicians to transfer the ventilation plate 223.

[0065] It should be noted that the form of the detachable connection between the ventilation plate 223 and the downward flanging 2223 is not limited and can be adjusted according to actual needs.

[0066] Refer to Figure 6 and Figure 7 , as an example, a plurality of mounting holes 2231a are formed in the connection area 2231, and each mounting hole 2231a is correspondingly provided with a connecting member 2231b. The connecting member 2231b passes through the corresponding mounting hole 2231a and is configured not to fall off from the connection area 2231. One end of the connecting member 2231b is detachably connected to the downward flanging 2223.

[0067] In this embodiment, the connecting member 2231b passes through the mounting hole 2231a and is configured not to fall off from the connection area 2231 in a specific form, which can effectively prevent the connecting member 2231b from falling off during the process of disassembling the ventilation plate 223.

[0068] Refer to Figure 7 , as an example, the connecting member 2231b includes a nut, a screw rod section, and a threaded section connected in sequence. The screw rod section passes through the mounting hole 2231a, and the sizes of the nut and the threaded section are both larger than the aperture of the mounting hole 2231a, so that the connecting member 2231b will not fall off from the connection area 2231, and the threaded section is threadedly connected to the downward flanging 2223.

[0069] In this embodiment, the connecting member 2231b is set in the form of cooperation between a nut, a screw rod section, and a threaded section. Specifically, the screw rod section passes through the mounting hole 2231a, the nut and the threaded section will not fall off from the connection area 2231, and the threaded section is threadedly connected to the downward flanging 2223, which has the advantages of relatively simple overall structure and convenient for manual operation.

[0070] Refer to Figure 8 , as an example, a fixing nut capable of being threadedly matched with the threaded section is provided on the inner wall of the area of the downward flanging 2223 corresponding to the mounting hole 2231a.

[0071] It should be noted that for the structural or functional units not specifically described or limited in the chemical substance delivery system, they can be set according to the conventional selection in the art.

[0072] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A chemical delivery system, characterized in that: include: A chemical transmission device, wherein a vent is provided on the top of the chemical transmission device, and a chemical storage tank is installed in the chemical transmission device; The filter device comprises a power unit and a filter unit, wherein the power unit is located outside the chemical transmission device and corresponds to the position of the vent, and is used to provide airflow into the chemical transmission device; the filter unit is located inside the chemical transmission device and corresponds to the position of the vent, and is used to purify the airflow, and the filter cotton in the filter unit can be taken out.

2. The chemical delivery system according to claim 1, characterized in that: The filter unit includes the filter cotton, a mounting seat and a ventilation plate. The mounting seat is provided with an air flow channel and is connected to the top inner wall of the chemical transmission device. A first opening at one end of the air flow channel is communicated with the ventilation port, and a second opening at the other end is communicated with a chamber in the chemical transmission device for conveying the air flow into the chemical transmission device. The filter cotton is accommodated in the air flow channel for purifying the air flow. The ventilation plate is detachably connected to a side of the mounting seat where the second opening is provided for replacing the filter cotton.

3. The chemical delivery system according to claim 2, characterized in that: The bottom of the mounting seat is provided with the second opening, and the ventilation plate is detachably connected to the bottom of the mounting seat.

4. The chemical delivery system according to claim 3, characterized in that: The mounting seat includes an annular side plate with upper and lower ends penetrating therethrough and having the airflow channel inside, an upper flange extending inwardly at the upper end of the annular side plate, and a lower flange extending inwardly at the lower end of the annular side plate, the upper flange being connected to the top inner wall of the chemical transfer device, and the lower flange being detachably connected to the ventilation plate.

5. The chemical delivery system according to claim 4, characterized in that: The filter unit also includes a plurality of blocks, each of which is rotatably connected to the lower flange so that each of the blocks has a first state and a second state. When the block is in the first state, at least a portion of the block is located directly below the second opening to support the filter cotton; when the block is in the second state, the block is not located directly below the second opening.

6. The chemical delivery system according to claim 5, characterized in that: The clamping block includes a supporting portion and a mounting portion which are fixed to each other and form a Z-shape, and the mounting portion is rotatably connected to the lower flange so that the supporting portion can be rotated to the first state or the second state.

7. The chemical delivery system according to claim 4, characterized in that: The ventilation plate comprises a connection area located at the circumferential edge and a ventilation area located within the connection area. The connection area is detachably connected to the lower flange, and the ventilation area is provided with a plurality of ventilation holes distributed in an array.

8. The chemical delivery system according to claim 7, characterized in that: The connection area is provided with a plurality of mounting holes, each of the mounting holes is provided with a corresponding connecting piece, the connecting piece is passed through the corresponding mounting hole and is configured not to fall off from the connection area, and one end of the connecting piece is detachably connected to the lower flange.

9. The chemical delivery system according to claim 8, characterized in that: The connecting piece includes a nut, a screw segment and a threaded segment connected in sequence, the screw segment is inserted into the mounting hole, the sizes of the nut and the threaded segment are larger than the aperture of the mounting hole so that the connecting piece will not fall off from the connecting area, and the threaded segment is threadedly connected to the lower flange.

10. The chemical delivery system according to claim 1, characterized in that: The vent is located above the storage tank.

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