Laboratory waste gas purification ventilation cabinet

Abstract

The laboratory waste gas purification ventilation cabinet 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 located at the end, provided with a sealing plug, of the main filtering cavity, an open hole is formed in the limiting pipe, and the open hole is communicated with the main filtering cavity. The limiting pipe is sleeved with a filtering assembly, the filtering assembly can slide on the limiting pipe through a control assembly so that the filtering assembly can be located in the main filtering cavity to be compressed or stretched, and an exhaust structure is arranged in the main filtering cavity. The air cylinder is used for adjusting the stretching amplitude of the framework (for example, gaps are increased to prevent blockage during high concentration, and gaps are reduced to improve the filtering efficiency during low concentration), and the gear-driven twisting action is used for further staggering the gaps of the filtering layers to form a three-dimensional non-uniform filtering network, so that the capturing flexibility of particles with different particle sizes is remarkably enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of laboratory waste gas treatment, and particularly to a laboratory waste gas purification fume hood. Background Art

[0002] There are various types of laboratory waste gases, and the specific components depend on the experimental type, reagent use, and operation process. For example, inorganic waste gases (such as hydrogen chloride HCl, hydrogen sulfide H2S, ammonia NH3, etc.), organic waste gases (such as ozone O3, hydrogen cyanide HCN, carbon monoxide CO, etc.), and also common pollutants such as particulate matter generated during the reaction (including dust, soot, aerosol, etc.);

[0003] However, although the filter mesh needs to be replaced, a large amount of particulate matter will reduce the service life of the filter mesh. The most important thing is that larger particle sizes often cause the filter mesh of the fume hood to be blocked, reducing the exhaust efficiency. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] To solve the above-mentioned problems, the present invention provides the following technical solution: A laboratory waste gas purification fume hood, including a cabinet body, the cabinet cavity of the cabinet body is connected to the main filtration cavity, a limiting tube is provided in the main filtration cavity, and one end of the limiting tube is arranged on the inner wall of the main filtration cavity, and the other end is located at the end of the main filtration cavity with a sealing plug. Openings are provided on the limiting tube, and a filtration component is sleeved on the limiting tube. The filtration component can slide on the limiting tube through a control component so that the filtration component is compressed or stretched in the main filtration cavity, and an exhaust structure is provided in the main filtration cavity.

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

[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 magnetically attracts the magnetic ring of the support frame at one end of the limiting pipe. The support frame is arranged inside the main filter chamber. The other end of the filter body is provided with a first sealing ring, and an adsorption ring is arranged on the first sealing ring to cooperate 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. The main magnetic block magnetically attracts the adsorption ring.

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

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

[0012] Preferably, the number of the openings is multiple and is close to one end of the limiting pipe located at the exhaust port. A ventilation structure is arranged at the exhaust port.

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

[0014] Preferably, a filter housing is arranged on the cabinet body, and the cabinet cavity of the cabinet body is communicated with the filter housing through the main filter chamber.

[0015] The beneficial effects of the present invention are as follows: Adaptive filtration accuracy: The cylinder adjusts the stretching amplitude of the skeleton (for example, increasing the gap to prevent blockage at high concentrations and reducing the gap to improve the filtration efficiency at low concentrations). Combining with the twisting action driven by the gear in Embodiment 2, the gaps of the filter layer can be further staggered to form a three-dimensional non-uniform filtration network, significantly enhancing the capture flexibility for particles of different particle sizes.

[0016] The axial deformation in Embodiment 1 and the radial twisting in Embodiment 2 can operate independently or synchronously. For example, when processing highly viscous particles, first compress the filter body to reduce the gap to intercept large particles, and then shake off the attached impurities through the twisting action, realizing the synergistic optimization of "interception-self-cleaning", and further improving the filtration efficiency (compared with the static filtration structure).

[0017] Through the strong magnetic adsorption and fixation of the magnetic ring and the second sealing ring, and the auxiliary positioning of the main magnetic block, the replacement time of the filter component is shortened, and the opening structure of the limiting pipe increases the filtration space, improving the filtration capacity and the self-cleaning ability.

[0018] Utilizing the deformation potential energy of the elastic connecting piece, automatically trigger high-frequency stretching / twisting (such as the shaking-off mode in Embodiment 1) during the non-filtration period, and cooperate with the ventilation structure to form a directional air flow, which can improve the removal of attached particles and extend the service life of the filter body. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Among them:

[0020] Figure 1 It is a three-dimensional view of the whole of this embodiment.

[0021] Figure 2 For this embodiment Figure 1 Part of the three-dimensional view.

[0022] Figure 3 It is a three-dimensional view of the filter component of this embodiment.

[0023] Figure 4 It is a structural diagram of the interior of the filter component of this embodiment.

[0024] Figure 5 For this embodiment Figure 2 Partial schematic diagram.

[0025] Figure 6 It is a three-dimensional view of the internal structure of the filter component of this embodiment.

[0026] Figure 7 For this embodiment Figure 1 Three-dimensional view of the filter housing in this embodiment.

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

[0028] Filter component 200, filter body 201, first sealing ring 202, adsorption ring 202a, second sealing ring 203, first skeleton 204, second skeleton 205, elastic connecting piece 206, exhaust structure 300;

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

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings of the specification.

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

[0032] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other from other embodiments.

[0033] Embodiment 1

[0034] Refer to Figures 1 to 7, which is an embodiment of the present invention. This embodiment provides a laboratory exhaust gas purification fume hood, including a cabinet body 100. The cabinet cavity 100a of the cabinet body 100 is communicated with the main filtration cavity 100c. A filtration housing 101 is provided on the cabinet body 100. The cabinet cavity 100a of the cabinet body 100 is communicated with the filtration housing 101 through the main filtration cavity 100c. A limiting tube 103 is provided in the main filtration cavity 100c. One end of the limiting tube 103 is arranged on the inner wall of the main filtration cavity 100c, and the other end is located at the end of the main filtration cavity 100c with a sealing plug 105. A plurality of openings 103a are provided on the limiting tube 103, and the number of the openings 103a is multiple and close to the end of the limiting tube 103 at the exhaust port 101b. An exhaust structure 300 is provided at the exhaust port 101b. A filtration component 200 is sleeved on the limiting tube 103. The filtration component 200 can slide on the limiting tube 103 through a control component 400, so that the filtration component 200 is compressed or stretched in the main filtration cavity 100c. An exhaust structure 300 is provided in the main filtration cavity 100c; The filtration 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 skeletons 204, a plurality of second skeletons 205 and a plurality of elastic connecting pieces 206. The plurality of first skeletons 204 are elastically connected in series with the plurality of second skeletons 205 through the plurality of elastic connecting pieces 206. The outer surfaces of the first skeleton 204, the elastic connecting piece 206 and the second skeleton 205 are wrapped with a cloth-like filter body 201; The second skeleton 205 is slidably sleeved on the outer surface of the limiting tube 103, and the outer surface of the first skeleton 204 slides on the inner wall of the filtration housing 101, and the filter body 201 is in contact with the inner wall of the filtration 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 arranged inside the main filtration cavity 100c. The other end of the filter body 201 is provided with a first sealing ring 202, and an adsorption ring 202a is provided on the first sealing ring 202 to cooperate with the control component 400; The control component 400 includes a slide rail 401, a slider 402, a main magnet 403, a gear 404, a motor 405, a cylinder 406 and a connecting rod 407. The main magnet 403 is magnetically attracted to the adsorption ring 202a; The slide rail 401 is arranged on the outer surface of the filtration housing 101. The slider 402 is slidably arranged on the slide rail 401. The cylinder 406 is arranged on the outer surface of the filtration housing 101 away from the slider 402. The connecting rod 407 of the cylinder 406 is connected with the slider 402;

[0035] Specifically, the cabinet cavity 100a of the cabinet body 100 is communicated with 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 communicated with the outside. A limiting tube 103 is arranged in the main filter cavity, one end of which is fixed on the inner wall of the main filter cavity, and the other end extends to the end with a sealing plug 105. At the sealing plug 105, the filter assembly 200 can be conveniently replaced on the limiting tube 103. A plurality of openings 103a are provided on the limiting tube 103, and one end of these openings is close to the exhaust port 101b, ensuring that the openings 103a are inside the filter assembly 200 in the minimum compressed state of the filter assembly 200. An exhaust structure 300 (exhaust fan) is provided at the exhaust port 101b for providing exhaust air to suck the air in the cabinet communicated with the laboratory. The filter assembly 200 is installed on the limiting tube 103, and the filter assembly can slide on the limiting tube 103 through the control assembly 400, so as to realize the compression or stretching of the filter assembly in the main filter cavity 100c.

[0036] 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 skeletons 204, a plurality of second skeletons 205, and a plurality of elastic connectors 206. The first skeleton 204 and the second skeleton 205 are connected in series through the elastic connectors 206, and the outer surface is wrapped with a cloth-like filter body 201. The cloth-like filter body 201 is a carrier for filtering laboratory gases. Under the stretching and compression of the first skeleton 204 and the second skeleton 205, the filtering 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 skeleton 204 and the second skeleton 205 are stretched, the elastic connectors 206 are elastically arched, and the gap of the cloth-like filter body 201 becomes larger, otherwise the gap becomes smaller. And the cloth-like filter body 201 will fill most of the main filter cavity 100c. At the same time, the limiting tube 103 and the main filter cavity 100c with openings 103a serve as the filtering space. The second skeleton 205 is slidably sleeved on the outer surface of the limiting tube 103, and the filter body 201 contacts the inner wall of the filter housing 101, playing a role in the stable sliding of the entire filter component 200 on the limiting rod 103. The outer surface of the first skeleton 204 slides on the inner wall of the filter housing 101, so that the outer surface of the cloth-like filter body 201 blocks the main filter cavity 100c, allowing the gas to pass only through the gaps of the cloth-like filter body 201 to achieve filtration. One end of the filter body 201 is provided with a second sealing ring 203, which is magnetically adsorbed to the magnetic ring 104a of the support frame 104 at one end of the limiting tube 103, which can facilitate the fixation of the filter component 200 and the replacement of the filter component 200. The support frame 104 is arranged in the main filter cavity. The other end of the filter body 201 is provided with a first sealing ring 202. The two sealing rings also play a role in preventing the sealing of the filter component 200 at the limiting rod 103. The first sealing ring is provided with an adsorption ring 202a, which is used in cooperation with the control component 400. The control component 400 includes a slide rail 401, a slider 402, a main magnet 403, a gear 404, a motor 405, a cylinder 406, and a connecting rod 407. The main magnet 403 is magnetically adsorbed to the adsorption ring 202a. The slide rail 401 is arranged on the outer surface of the filter housing 101, and the slider 402 is slidably arranged on the slide rail 401. The cylinder 406 is arranged 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. Mainly through the magnetic attraction between the adsorption ring 202a and the main magnet 403, and driving the main magnet 403 on the slider 402 through the cylinder 406, the plurality of skeletons are stretched and compressed. When stretched, the skeletons are connected by the elastic connectors 206, so there is elastic potential energy, which can realize the uniform restoration of the original state of the cloth-like filter body 201 on the outer surfaces of the plurality of skeletons, and when compressed, the elastic connectors 206 have elastic potential energy of compression, avoiding the skeletons being too close to each other and preventing the problem of filter blockage caused by too small gaps in the cloth-like filter body 201;

[0037] It is worth mentioning that when the filtering component 200 does not filter gas, the main magnet 403 on the slider 402 is driven by the cylinder 406 to quickly stretch and compress multiple skeletons, shake off the particulate impurities adsorbed by the cloth-like filter body 201, and discharge the particles through the auxiliary filtering cavity 100e of the limiting pipe 103 and the main filtering cavity 100c of the filtering housing 101 by opening the exhaust structure 300, so as to realize the self-cleaning of the filter body 201, improve its service life and the smoothness of the subsequent filter body 201 during the filtering process;

[0038] The stretching and compression of multiple skeletons are adjusted infinitely by driving the main magnet 403 on the slider 402 through the cylinder 406. Theoretically, the overall gap size of the filter body 201 can be adjusted arbitrarily. Therefore, according to 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 filtering component 200 is stretched by the cylinder 406 to increase the filtering gap to make the filtering smooth. When there is more gas, the filtering component is stretched slightly. Theoretically, an intelligent and controllable filtering effect can be achieved;

[0039] Replacement of the filtering component 200: By removing the sealing plug 105, one end of the filtering component 200 with the second sealing ring 203 is sleeved on the limiting rod 103, and the second sealing ring 203 is adsorbed to the magnetic ring 104a on the support frame 104 of the limiting rod 103 by the adsorption of the main magnet 403 (the magnetic force of the magnetic ring 104a is greater than that of the main magnet 403), so that the second skeleton 205 is completely sleeved on the limiting rod 103. Finally, the adsorption ring 202a of the first sealing ring 202 is adsorbed to the main magnet 403 to complete the installation. Finally, the sealing plug 105 is sleeved on, and the removal is more convenient. Remove the sealing plug 105, let the main magnet 403 push the adsorption ring 202a to a position close to the sealing plug 105, and finally pull out the filtering component 200 with force.

[0040] Embodiment 2

[0041] Refer to Figure 7 , which is another embodiment of the present invention. In this embodiment, a main magnet 403 is slidably arranged on the slider 402, and the main magnet 403 is meshed with the gear 404 of the output shaft of the motor 405, so that multiple first skeletons 204, second skeletons 205 and elastic connectors 206 are twisted in a reverse direction. During the twisting process, the gap of the cloth-like filter body 201 can be further changed, and the gaps of the cloth-like 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-like filter body 201;

[0042] It is worth mentioning that, in cooperation with changing the gap of the cloth-like filter 201 in the form of stretching or compressing in Embodiment 1, it is possible to distort the cloth-like filter 201 to change the filtering effect when the cloth-like filter 201 is not stretched and compressed, and it is also possible to change the filtering effect only by stretching and compressing the cloth-like filter 201, or to simultaneously change the filtering effect by both methods.

[0043] It is important to note that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (for example, changes in the dimensions, scales, structures, shapes and proportions of various elements, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures that perform the recited function described herein, and not only structurally equivalent but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

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

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A laboratory waste gas purification fume hood, characterized in that: It includes a cabinet body (100). The cabinet cavity (100a) of the cabinet body (100) is communicated with the main filter cavity (100c). A limiting tube (103) is arranged in the main filter cavity (100c). One end of the limiting tube (103) is arranged on the inner wall of the main filter cavity (100c), and the other end is located at one end of the main filter cavity (100c) with a sealing plug (105). An opening (103a) is arranged on the limiting tube (103). A filter assembly (200) is sleeved on the limiting tube (103). The filter assembly (200) can slide on the limiting tube (103) through a control assembly (400) so that the filter assembly (200) is compressed or stretched in the main filter cavity (100c). An exhaust structure (300) is arranged in the main filter cavity (100c).

2. The laboratory exhaust gas purification fume hood according to claim 1, characterized in that: The filter assembly (200) includes a filter body (201), a first sealing ring (202), an adsorption ring (202a), a second sealing ring (203), a plurality of first skeletons (204), a plurality of second skeletons (205) and a plurality of elastic connectors (206). The plurality of first skeletons (204) are elastically connected in series with the plurality of second skeletons (205) through the plurality of elastic connectors (206). The outer surfaces of the first skeletons (204), the elastic connectors (206) and the second skeletons (205) are wrapped with a cloth-like filter body (201).

3. The laboratory waste gas purification fume hood according to claim 2, wherein: 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).

4. The laboratory waste gas purification fume hood according to claim 3, wherein: 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 arranged inside the main filter cavity (100c). The other end of the filter body (201) is provided with a first sealing ring (202). An adsorption ring (202a) is arranged on the first sealing ring (202) and is matched with the control assembly (400).

5. The laboratory exhaust gas purification fume hood according to claim 4, characterized in that: The control assembly (400) includes a slide rail (401), a slider (402), a main magnet block (403), a gear (404), a motor (405), a cylinder (406) and a connecting rod (407). The main magnet block (403) is magnetically attracted to the adsorption ring (202a).

6. The laboratory waste gas purification fume hood according to claim 5, characterized in that: The slide rail (401) is arranged on the outer surface of the filter housing (101). The slider (402) is slidably arranged on the slide rail (401). The cylinder (406) is arranged on the outer surface of the filter housing (101) far away from the slider (402). The connecting rod (407) of the cylinder (406) is connected with the slider (402).

7. The laboratory waste gas purification fume hood according to claim 6, characterized in that: The main magnet block (403) is slidably arranged on the slider (402). The main magnet block (403) is meshed with the gear (404) on the output shaft of the motor (405).

8. The laboratory exhaust gas purification fume hood according to claim 1, wherein: The number of the openings (103a) is multiple and is close to one end of the limit tube (103) located at the exhaust port (101b), and an exhaust structure (300) is provided at the exhaust port (101b).

9. The laboratory waste gas purification fume hood according to claim 8, characterized in that: The exhaust structure (300) is a fan blade type exhaust fan.

10. The laboratory waste gas purification fume hood according to claim 1, characterized in that: A filter housing (101) is provided on the cabinet body (100), and a cabinet cavity (100a) of the cabinet body (100) is communicated with the filter housing (101) through a main filter cavity (100c).

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