Laboratory exhaust fume purification fume hood

Abstract

The application discloses a laboratory waste gas purification fume hood, which comprises a cabinet body, a cabinet cavity of the cabinet body is communicated with a main filtering cavity, a limiting pipe is arranged in the main filtering cavity, one end of the limiting pipe is arranged on the inner wall of the main filtering cavity, the other end of the limiting pipe is arranged on one end of the main filtering cavity which is provided with a sealing plug, an opening is arranged on the limiting pipe, a filtering assembly is arranged on the limiting pipe in a sleeving mode, the filtering assembly can slide on the limiting pipe through a control assembly, so that the filtering assembly is compressed or stretched in the main filtering cavity, and an exhaust structure is arranged in the main filtering cavity. The fume hood can further stagger the gaps between filtering layers to form a three-dimensional non-uniform filtering network through the torsion action of the gear drive and the adjustment of the stretching range of the skeleton by the air cylinder (for example, the gap is increased to prevent blockage when the concentration is high, and the gap is reduced to improve the filtering efficiency when the concentration is low), so that the flexibility of capturing particles with different diameters is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of laboratory exhaust gas treatment technology, and in particular to a laboratory exhaust gas purification fume hood. Background Technology

[0002] Laboratory exhaust gases are diverse, and their specific components depend on the type of experiment, reagents used, and operating procedures. These include inorganic exhaust gases (hydrogen chloride HCl, hydrogen sulfide H2S, ammonia NH3, etc.), organic exhaust gases (ozone O3, hydrogen cyanide HCN, carbon monoxide CO, etc.), and common pollutants such as particulate matter (including dust, smoke, aerosols, etc.) generated during reactions.

[0003] However, while filters do need to be replaced, a large amount of particulate matter can reduce their lifespan. The main issue is that larger particles often clog the filters in the fume hood, reducing exhaust efficiency. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] To address the aforementioned problems, the present invention provides the following technical solution: a laboratory exhaust gas purification fume hood, comprising a cabinet body, wherein the cabinet cavity of the cabinet body is connected to a main filter cavity, a limiting tube is provided in the main filter cavity, one end of the limiting tube is located on the inner wall of the main filter cavity, and the other end is located at the end of the main filter cavity with a sealing plug, the limiting tube is provided with an opening, and a filter assembly is sleeved on the limiting tube, the filter assembly being able to slide on the limiting tube by a control component, so that the filter assembly is compressed or stretched within the main filter cavity, and an exhaust structure is provided within the main filter cavity.

[0006] Preferably, the filter assembly includes a filter body, a first sealing ring, an adsorption ring, a second sealing ring, a plurality of first frames, a plurality of second frames, and a plurality of elastic connectors. The plurality of first frames are elastically connected in series with the plurality of second frames through the plurality of elastic connectors. The outer surfaces of the first frames, elastic connectors, and second frames are wrapped with a cloth-like filter body.

[0007] Preferably, the second skeleton is slidably sleeved on the outer surface of the limiting tube, the outer surface of the first skeleton slides on the inner wall of the filter housing, and the filter body is in contact with the inner wall of the filter housing.

[0008] Preferably, one end of the filter body is provided with a second sealing ring that is magnetically attracted to the magnetic ring of the support frame at one end of the limiting tube. The support frame is located inside the main filter chamber. The other end of the filter body is provided with a first sealing ring, and the first sealing ring is provided with an adsorption ring that cooperates with the control component.

[0009] Preferably, the control component includes a slide rail, a slider, a main magnetic block, a gear, a motor, a cylinder, and a connecting rod, wherein the main magnetic block is magnetically attracted to the adsorption ring.

[0010] Preferably, the slide rail is disposed on the outer surface of the filter housing, the slider is slidably disposed on the slide rail, the cylinder is disposed on the outer surface of the filter housing away from the slider, and the connecting rod of the cylinder is connected to the slider.

[0011] Preferably, a main magnetic block is slidably mounted on the slider, and the main magnetic block meshes with a gear on the motor output shaft.

[0012] Preferably, the number of openings is multiple and they are located near the end of the limiting tube at the exhaust port, and the exhaust port is provided with an exhaust structure.

[0013] Preferably, the exhaust structure is a fan-type exhaust fan.

[0014] Preferably, the cabinet is provided with a filter housing, and the cabinet cavity of the cabinet is connected to the filter housing through the main filter cavity.

[0015] The beneficial effects of the present invention are: adaptive filtration accuracy: the cylinder adjusts the stretching amplitude of the skeleton (such as increasing the gap to prevent clogging when the concentration is high, and reducing the gap to improve filtration efficiency when the concentration is low). Combined with the gear-driven twisting action of Embodiment 2, the gaps of the filter layers can be further staggered to form a three-dimensional non-uniform filtration network, which significantly enhances the flexibility of capturing particles of different sizes.

[0016] The axial deformation of Example 1 and the radial torsion of Example 2 can operate independently or simultaneously. For example, when processing highly viscous particles, the filter body is first compressed to reduce the gap and intercept large particles, and then the attached impurities are shaken off by the torsion action, so as to achieve the synergistic optimization of "interception-self-cleaning" and further improve the filtration efficiency (compared to the static filter structure).

[0017] The filter assembly is fixed by strong magnetic adsorption between the magnetic ring and the second sealing ring, and with the auxiliary positioning of the main magnetic block, the replacement time of the filter assembly is shortened. In addition, the opening structure of the limiting tube increases the filtration space, thereby improving the filtration capacity and self-cleaning ability.

[0018] By utilizing the deformation potential energy of the elastic connector, high-frequency expansion / twist (such as the shaking mode in Example 1) is automatically triggered during non-filtration periods. This, combined with the exhaust structure, forms a directional airflow, which can improve the removal of attached particles and extend the service life of the filter. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a perspective view of the entire embodiment.

[0021] Figure 2 This is an example. Figure 1 Partial 3D view.

[0022] Figure 3 This is a perspective view of the filter component in this embodiment.

[0023] Figure 4 This is a structural diagram of the internal structure of the filter component in this embodiment.

[0024] Figure 5 This is an example. Figure 2 A partial schematic diagram.

[0025] Figure 6 This is a perspective view of the internal structure of the filter component in this embodiment.

[0026] Figure 7 This is an example. Figure 1 A 3D view of the filter housing.

[0027] In the figure: cabinet 100, cabinet cavity 100a, main filter cavity 100c, secondary filter cavity 100e, filter housing 101, air inlet 101a, exhaust port 101b, limiting tube 103, opening 103a, support frame 104, magnetic ring 104a, sealing plug 105;

[0028] Filter assembly 200, filter body 201, first sealing ring 202, adsorption ring 202a, second sealing ring 203, first frame 204, second frame 205, elastic connector 206, exhaust structure 300;

[0029] Control component 400, slide rail 401, slider 402, main magnetic block 403, gear 404, motor 405, cylinder 406, connecting rod 407. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figures 1 to 7This embodiment of the invention provides a laboratory exhaust gas purification fume hood, including a cabinet body 100. The cabinet cavity 100a of the cabinet body 100 is connected to a main filter cavity 100c. A filter housing 101 is provided on the cabinet body 100. The cabinet cavity 100a of the cabinet body 100 is connected to the filter housing 101 through the main filter cavity 100c. A limiting tube 103 is provided inside the main filter cavity 100c, with one end of the limiting tube 103 located on the inner wall of the main filter cavity 100c and the other end located at the end of the main filter cavity 100c with a sealing plug 105. The limiting tube 103 has multiple openings 103a. And near the end of the limiting tube 103 located at the exhaust port 101b, an exhaust structure 300 is provided at the exhaust port 101b, and a filter assembly 200 is sleeved on the limiting tube 103. The filter assembly 200 can slide on the limiting tube 103 through the control assembly 400, so that the filter assembly 200 is compressed or stretched within the main filter chamber 100c. An exhaust structure 300 is provided within the main filter chamber 100c. The filter assembly 200 includes a filter body 201, a first sealing ring 202, an adsorption ring 202a, a second sealing ring 203, several first frames 204, several second frames 205, and several elastic connectors 206. A first frame 204 is elastically connected in series with several second frames 205 via several elastic connectors 206. The outer surfaces of the first frame 204, the elastic connectors 206, and the second frames 205 are covered with a cloth-like filter body 201. The second frames 205 are slidably sleeved on the outer surface of the limiting tube 103. The outer surface of the first frame 204 slides against the inner wall of the filter housing 101, and the filter body 201 is in contact with the inner wall of the filter housing 101. One end of the filter body 201 is provided with a second sealing ring 203, which is magnetically attracted to the magnetic ring 104a of the support frame 104 at one end of the limiting tube 103. The support frame 104 is located in the main filter chamber 100c. Inside, the other end of the filter body 201 is provided with a first sealing ring 202, and the first sealing ring 202 is provided with an adsorption ring 202a that cooperates with the control component 400; the control component 400 includes a slide rail 401, a slider 402, a main magnetic block 403, a gear 404, a motor 405, a cylinder 406 and a connecting rod 407, the main magnetic block 403 and the adsorption ring 202a are magnetically attracted; the slide rail 401 is provided on the outer surface of the filter housing 101, the slider 402 is slidably provided on the slide rail 401, the cylinder 406 is provided on the outer surface of the filter housing 101 away from the slider 402, and the connecting rod 407 of the cylinder 406 is connected to the slider 402;

[0035] Specifically, the cabinet cavity 100a of the cabinet 100 is connected to the main filter cavity 100c of the filter housing 101. The filter housing 101 also has an air inlet 101a located in the cabinet cavity 100a and an exhaust port 101b communicating with the outside. A limiting tube 103 is provided in the main filter cavity, one end of which is fixed to the inner wall of the main filter cavity, and the other end extends to the end with a sealing plug 105. The filter assembly 200 can be easily replaced on the limiting tube 103 at the sealing plug 105. The limiting tube 103 is provided with multiple openings 103a. These openings are close to the end of the exhaust port 101b to ensure that the openings 103a are inside the filter assembly 200 when the filter assembly 200 is in its minimum compressed state. An exhaust structure 300 (exhaust fan) is provided at the exhaust port 101b to provide exhaust air to draw air from the cabinet into the laboratory. A filter assembly 200 is installed on the limiting tube 103. The filter assembly can slide on the limiting tube 103 through the control assembly 400, thereby realizing the compression or stretching of the filter assembly in the main filter chamber 100c.

[0036] The filter assembly 200 includes a filter body 201, a first sealing ring 202, an adsorption ring 202a, a second sealing ring 203, several first skeletons 204, several second skeletons 205, and several elastic connectors 206. The first skeletons 204 and second skeletons 205 are connected in series via elastic connectors 206. The outer surface of the first skeletons 204 and second skeletons 205 is covered with a cloth-like filter body 201, which serves as a carrier for filtering laboratory gases. Under the stretching and compression of the first skeletons 204 and second skeletons 205, the filtration gap of the mesh structure of the cloth-like filter body 201 can be changed, and the elastic deformation of the elastic connectors 206 also has this effect. Specifically, when the first skeletons 204 and second skeletons 205 are stretched, the elastic connectors 206 elastically arch, and the gap of the cloth-like filter body 201 becomes larger; conversely, the gap becomes smaller. The cloth-like filter body 201 will fill most of the main filter chamber 100c. At the same time, the limiting tube 103, due to its opening 103a, also serves as a filtration space along with the main filter chamber 100c. The second frame 205 is slidably sleeved on the outer surface of the limiting tube 103, and the filter body 201 is in contact with the inner wall of the filter housing 101, which plays the role of stabilizing the sliding of the entire filter assembly 200 on the limiting rod 103. The outer surface of the first frame 204 slides on the inner wall of the filter housing 101, so that the outer surface of the cloth filter body 201 blocks the main filter chamber 100c, so that the gas can only pass through the gap of the cloth filter body 201 to achieve filtration. One end of the filter body 201 is provided with a second sealing ring 203, which is magnetically attracted to the magnetic ring 104a of the support frame 104 at one end of the limiting tube 103, which can facilitate the fixing of the filter assembly 200 and the replacement of the filter assembly 200. The support frame 104 is located in the main filter chamber. The other end of the filter body 201 is provided with a first sealing ring 202. The two sealing rings also serve to prevent the filter assembly 200 from being sealed at the limiting rod 103. The first sealing ring is provided with an adsorption ring 202a, which works in conjunction with the control assembly 400. The control assembly 400 includes a slide rail 401, a slider 402, a main magnetic block 403, a gear 404, a motor 405, a cylinder 406, and a connecting rod 407. The main magnetic block 403 is magnetically attracted to the adsorption ring 202a. The slide rail 401 is located on the outer surface of the filter housing 101, and the slider 402 is slidably mounted on the slide rail 401. The cylinder 406 is located on the outer surface of the filter housing 101 away from the slider 402, and its connecting rod 407 is connected to the slider 402. It is mainly attracted by the magnetic attraction of the main magnetic block 403 through the adsorption ring 202a, and the cylinder 406 drives the main magnetic block 403 on the slider 402 to stretch and compress multiple skeletons. When stretched, the skeletons are connected by the elastic connector 206, so they have elastic potential energy, which can make the cloth filter body 201 on the outer surface of multiple skeletons uniformly return to its original state. When compressed, the elastic connector 206 has compressive elastic potential energy, which avoids the skeletons from being too close and prevents the problem of filter blockage caused by the small gap of the cloth filter body 201.

[0037] It is worth mentioning that when the filter assembly 200 is not filtering gas, the main magnetic block 403 on the slider 402 is driven by the cylinder 406 to make multiple skeletons stretch and compress quickly, shaking off the particulate impurities adsorbed by the cloth filter body 201. The particles are discharged through the secondary filter chamber 100e of the limiting tube 103 and the main filter chamber 100c of the filter housing 101 by opening the exhaust structure 300, thereby achieving self-cleaning of the filter body 201, improving its service life and the smoothness of the subsequent filter body 201 in the filtration process.

[0038] The cylinder 406 drives the main magnetic block 403 on the slider 402 to infinitely adjust the stretching and compression of multiple frames. Theoretically, the overall gap size of the filter body 201 can be adjusted at will. Thus, depending on the actual situation, such as setting a smoke concentration detection sensor in the cabinet cavity 100a to cooperate with the cylinder 406, when the particle density is high, the cylinder 406 stretches the filter component 200 to increase the filter gap and make the filtration smooth. When there is a lot of gas, the filter component is stretched slightly. Theoretically, an intelligent and controllable filtration effect can be achieved.

[0039] To replace the filter assembly 200: Remove the sealing plug 105, place the end of the filter assembly 200 with the second sealing ring 203 onto the limiting rod 103, and use the main magnetic block 403 to attract the second sealing ring 203 to attract the magnetic ring 104a on the support frame 104 of the limiting rod 103 (the magnetic force of the magnetic ring 104a is greater than that of the main magnetic block 403). Then, fully cover the second frame 205 onto the limiting rod 103. Finally, allow the adsorption ring 202a of the first sealing ring 202 to attract the main magnetic block 403 for installation. Afterward, put the sealing plug 105 back on for easier removal. Remove the sealing plug 105, allow the main magnetic block 403 to push the adsorption ring 202a closer to the sealing plug 105, and finally pull out the filter assembly 200.

[0040] Example 2

[0041] Reference Figure 7 In another embodiment of the present invention, a main magnetic block 403 is slidably provided on the slider 402. The main magnetic block 403 meshes with the gear 404 of the output shaft of the motor 405, causing multiple first skeletons 204, second skeletons 205, and elastic connectors 206 to twist in opposite directions. During the twisting process, the gap of the cloth filter body 201 can be further changed, and the gap of the cloth filter body 201 between adjacent first skeletons 204 and second skeletons 205 can be staggered or overlapped to further change the gap of the cloth filter body 201.

[0042] It is worth mentioning that, in conjunction with the change of the gap of the cloth filter body 201 by stretching or compressing in Embodiment 1, this embodiment can achieve the effect of changing the filtration effect by twisting the cloth filter body 201 without stretching or compressing the cloth filter body 201, and can also achieve the filtration effect by stretching and compressing the cloth filter body 201 alone, or can simultaneously change the filtration effect by both methods.

[0043] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0044] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A laboratory exhaust gas purification fume hood, characterized in that: The system includes a cabinet (100), the cabinet cavity (100a) of which is connected to the main filter cavity (100c). A limiting tube (103) is provided inside the main filter cavity (100c), with one end of the limiting tube (103) located on the inner wall of the main filter cavity (100c) and the other end located at the end of the main filter cavity (100c) with a sealing plug (105). An opening (103a) is provided on the limiting tube (103), and a filter assembly (200) is fitted onto the limiting tube (103). The filter assembly (200) is controlled by... The component (400) can slide on the limiting tube (103) to compress or stretch the filter component (200) within the main filter chamber (100c), which is provided with an exhaust structure (300). The filter component (200) includes a filter body (201), a first sealing ring (202), an adsorption ring (202a), a second sealing ring (203), a plurality of first frames (204), a plurality of second frames (205), and a plurality of elastic connectors (206). The plurality of first frames (204) are connected by... Several elastic connectors (206) are elastically connected in series with several second skeletons (205). The outer surfaces of the first skeleton (204), elastic connectors (206), and second skeletons (205) are wrapped with cloth-like filter bodies (201). One end of the filter body (201) is provided with a second sealing ring (203) which is magnetically attracted to the magnetic ring (104a) of the support frame (104) at one end of the limiting tube (103). The support frame (104) is located inside the main filter chamber (100c). The other end of the filter body (201) is provided with a first sealing ring (202). The first sealing ring (202) is provided with an adsorption ring (202a) that cooperates with the control component (400). The control component (400) includes a slide rail (401), a slider (402), a main magnetic block (403), a gear (404), a motor (405), a cylinder (406), and a connecting rod (407). The main magnetic block (403) is magnetically attracted to the adsorption ring (202a). The main magnetic block (403) is slidably provided on the slider (402). The main magnetic block (403) meshes with the gear (404) on the output shaft of the motor (405).

2. The laboratory exhaust gas purification fume hood as described in claim 1, characterized in that: The second skeleton (205) is slidably sleeved on the outer surface of the limiting tube (103), the outer surface of the first skeleton (204) slides on the inner wall of the filter housing (101), and the filter body (201) is in contact with the inner wall of the filter housing (101).

3. The laboratory exhaust gas purification fume hood as described in claim 1, characterized in that: The slide rail (401) is located on the outer surface of the filter housing (101), the slider (402) is slidably located on the slide rail (401), and the cylinder (406) is located on the outer surface of the filter housing (101) away from the slider (402). The connecting rod (407) of the cylinder (406) is connected to the slider (402).

4. The laboratory exhaust gas purification fume hood as described in claim 1, characterized in that: The number of openings (103a) is multiple and they are located near the end of the exhaust port (101b) close to the limiting tube (103). The exhaust port (101b) is provided with an exhaust structure (300).

5. The laboratory exhaust gas purification fume hood as described in claim 4, characterized in that: The exhaust structure (300) is a fan-bladed exhaust fan.

6. The laboratory exhaust gas purification fume hood as described in claim 1, characterized in that: The cabinet (100) is provided with a filter housing (101), and the cabinet cavity (100a) of the cabinet (100) is connected to the filter housing (101) through the main filter cavity (100c).

Images