High-performance ventilation cabinet
By setting up a horizontally connected first cavity and second cavity in the test counter, and using structures such as negative pressure devices and spacers, the problem of incomplete adsorption of harmful gases in the prior art is solved, and more efficient Gas discharge and ventilation effects.
Patent Information
- Application Number
- CN202421119515.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The fan design of the existing test counter causes the distance between harmful gases to pass on the test counter to be long, resulting in the problem of incomplete adsorption, especially the high density of harmful gases may remain in the cabinet.
A high-performance fume hood is designed. By setting a first cavity and a second cavity in the cabinet body and communicating in the horizontal direction, the gas enters the second cavity in the horizontal direction and discharges it with a negative pressure device. The deflector is used to isolate and guide the flow of gas, reduce gas flow resistance, and the air collector hood improves adsorption capacity.
It effectively shortens the gas discharge path, improves the gas suction speed and efficiency, reduces the residue of toxic gases, and reduces the simple structure reduces costs and improves ventilation performance.
Smart Images
Figure CN222326183U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of experimental testing instruments, in particular to a high-performance fume hood. Background Art
[0002] Experimenters usually do testing work indoors. In order to better allocate work processes and divide preparation areas, for example, the preparation of chemical reagents is usually completed on a separate test bench. In order to minimize the impact of external factors on the test process, the test bench is usually designed in the shape of a cabinet to avoid excessive volatilization or leakage of drugs in the environment around the test bench, which increases the cost of cleaning.
[0003] The above-mentioned counter for testing generally has a table top for testing inside, and the experimenter can perform experimental operations on the window. The experimenter generally uses chemicals, and harmful gases are inevitably generated during the experiment. Long-term contact is not good for health. Therefore, the test counter in the prior art will add a fan on the cabinet to absorb the harmful gases inside the counter, such as the experimental table top and the space near it, and discharge the harmful gases and then treat them scientifically. The fan of the existing test counter is usually designed at the top of the cabinet, which is convenient for directly connecting the top wall of the cabinet to absorb the harmful gases. Therefore, the above-mentioned method of absorbing harmful gases belongs to vertical adsorption, that is, the fan is located above the experimental table top. After the harmful gases evaporate from the experimental table top, they need to be adsorbed to the top of the cabinet before they can be discharged. This suction method makes the toxic gas pass a long distance on the experimental table top, which is easy to cause the problem of incomplete adsorption of harmful gases, especially for harmful gases with higher density, which may cause more harmful gases to remain in the cabinet. Therefore, the ventilation structure of the test counter needs to be further improved. Utility Model Content
[0004] The high-performance fume hood of the utility model can effectively solve the problem that the ventilation structure of the existing test cabinet is not conducive to exhausting harmful gases.
[0005] According to one aspect of the utility model, a high-performance fume hood is provided, comprising:
[0006] A cabinet, wherein the cabinet has a first cavity and a second cavity, the first cavity and the second cavity are arranged side by side in a horizontal direction, the first cavity has a laboratory table, and the second cavity is connected to the first cavity on a side close to the laboratory table;
[0007] and a negative pressure device, wherein the negative pressure device is disposed on the cabinet, and an input end of the negative pressure device is connected to the second cavity;
[0008] The negative pressure device generates a negative pressure attraction force, so that the gas in the first cavity enters the second cavity in a horizontal direction and is discharged into the cabinet.
[0009] In some embodiments, a partition plate is provided between the first cavity and the second cavity, and the partition plate is provided with a plurality of conducting ports, through which the gas in the first cavity enters the second cavity. Thus, the partition plate is used to isolate the gas in the first cavity from the gas in the second cavity to prevent backflow, and the conducting ports can prevent the gas in the first cavity from evaporating too quickly and being located at the top of the first cavity, and the gas can still enter the second cavity through the conducting ports and finally be discharged.
[0010] In some embodiments, the cabinet is provided with an exhaust port connected to the second cavity, the negative pressure device is arranged on the exhaust port, a guide plate is connected between the exhaust port and the partition plate, and the guide plate and the second cavity form a channel for guiding gas discharge. Thus, the guide plate is used to guide gas discharge, reduce resistance to gas flow, and improve suction force in the second cavity.
[0011] In some embodiments, an air collecting hood is connected between the exhaust port and the negative pressure device, and the air collecting hood reduces the gas passage between the exhaust port and the input end of the negative pressure device. Thus, the air collecting hood is conducive to improving the adsorption capacity of the negative pressure device.
[0012] In some embodiments, the cabinet body is provided with a movable cabinet door, and the cabinet door adjusts the opening and closing area of the first cavity by its movement, so that the cabinet door can prevent the test solution in the first cavity from splashing and causing contamination during the experiment.
[0013] In some embodiments, a traction group is further included, the traction group comprising:
[0014] A traction belt, a first end of which is connected to the cabinet door;
[0015] A fixed wheel, the fixed wheel being arranged on the cabinet;
[0016] a counterweight block, to which the second end of the traction belt is connected;
[0017] The cabinet door is positioned on the cabinet body by the traction group. Thus, the traction belt can traction the cabinet door to move, the fixed wheel cooperates with the traction belt so as to lock the cabinet door at a specific position, and the counterweight block is used to adapt a suitable weight for the cabinet door to move.
[0018] In some embodiments, the traction group is provided with at least two groups, and the traction groups are respectively connected to both sides of the cabinet door to balance the movement of the cabinet door. Thus, the two traction groups are conducive to keeping the cabinet door from tilting when moving, further improving the synchronization of the cabinet door, and facilitating the user to operate with one hand.
[0019] In some embodiments, a lower seat is further included, the lower seat being connected to the bottom of the cabinet, and the lower seat having a third cavity for storing items. Thus, the lower seat is convenient for storing items needed for the experiment, and can be replaced and used at any time.
[0020] In some embodiments, the third cavity is connected to the first cavity and / or the second cavity, and the negative pressure device generates a negative pressure attraction force, so that the gas in the third cavity enters the first cavity and / or the second cavity in a vertical direction. Thus, the gas generated in the third cavity can enter the first cavity and / or the second cavity and be discharged through the negative pressure device, which is conducive to ensuring the gas environment of the third cavity.
[0021] In some embodiments, an exhaust passage is provided between the third cavity and the first cavity and / or the second cavity, and the third cavity is connected to the first cavity and / or the second cavity through the exhaust passage. Thus, the third cavity is connected to the first cavity and / or the second cavity through the exhaust passage.
[0022] Compared with the prior art, the high-performance fume hood of the utility model has the following beneficial effects:
[0023] The cabinet of the present application can be tested in the first cavity, the second cavity is used to guide the gas, and the gas in the first cavity is sucked out through the negative pressure device. The second cavity is connected with the first cavity on the side close to the test table. After the negative pressure device is started, the gas in the first cavity enters the second cavity in the horizontal direction from the side closest to the test table, and there is no need to pass through the top of the first cavity in the vertical direction, which shortens the path of the gas in the first cavity to be discharged from the first cavity. The gas in the first cavity enters the second cavity more quickly and is finally discharged, which effectively ensures that there will not be too much toxic gas remaining in the first cavity. Even if there is a lot of toxic gas in the first cavity, the toxic gas will be transferred to the second cavity first. The second cavity is also beneficial to isolate the gas sucked out of the first cavity. The simple structure is conducive to reducing costs and has high performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the structure of the high-performance fume hood of the utility model;
[0025] Figure 2 It is a cross-sectional schematic diagram of the high-performance fume hood of the utility model;
[0026] Figure 3 for Figure 2 A magnified view of the structure in ;
[0027] Figure 4 This is a schematic diagram of the high-performance fume hood of the utility model after omitting the air collecting hood and the negative pressure device;
[0028] Figure 5 This is a schematic diagram of the high-performance fume hood of the utility model with the cabinet door omitted.
[0029] In the figure: 1-cabinet, 11-first cavity, 12-second cavity, 112-laboratory table, 13-partition plate, 131-conduction port, 14-connection port, 15-guide plate, 16-wind collecting hood, 17-exhaust port, 18-cabinet door, 19-support frame, 2-negative pressure device, 3-lower seat, 31-third cavity, 32-exhaust channel, 41-traction belt, 42-fixed wheel, 43-counterweight block. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0032] The utility model relates to a high-performance fume hood, which can facilitate experimental personnel to carry out experimental operations. Even if harmful gases are generated inside, they can be effectively discharged outside the hood. The exhausted gases are generally guided to the outdoors through pipelines for scientific treatment, or are discharged after being purified in the pipeline, so as to avoid experimental personnel from contacting volatile gases for a long time during operation. The structure adopted is simple and the exhaust effect is excellent. The humanized design has preset spaces on the sides and bottom of the fume hood, which is convenient for installing and maintaining water, electricity and gas systems and has high performance value.
[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0034] Figure 1A high performance fume hood according to an embodiment of the present invention is schematically shown. Figure 1 As shown, the horizontal direction is direction A, the vertical direction is direction B (gravity direction), and direction C is left and right direction. The three directions are orthogonal to each other. The high-performance fume hood includes a cabinet body 1, a negative pressure device 2 and a lower seat body 3.
[0035] like Figure 1 , Figure 2 As shown, the main structure of the cabinet 1 is made of high-quality carbon steel (Q235, A3), and is roughly rectangular. The internal operating area is made of anti-corrosion materials and is completely isolated from the main structure. The multi-layer structure design ensures excellent internal anti-corrosion performance and the firmness of the overall structure. Anti-corrosion materials include organic and inorganic coatings, fiberglass, rubber products, inorganic plates, etc. The cabinet 1 has a first cavity 11 and a second cavity 12. The volume of the first cavity 11 is greater than that of the second cavity 12. The first cavity 11 faces the experimenter. The first cavity 11 has a laboratory table 112. The laboratory table 112 can be a physical and chemical plate or a ceramic plate. It has corrosion resistance and is convenient for long-term use by the experimenter. Other structures related to the experiment can also be arranged in the first cavity 11, such as a storage rack, a cleaning mechanism, a placement rack, etc. Therefore, the experimenter can perform experimental operations in the first cavity 11 through the laboratory table 112, wherein the first cavity 11 and the second cavity 12 are arranged side by side in the horizontal direction, the second cavity 12 is closer to the back of the cabinet 1, and the second cavity 12 and the first cavity 11 can be connected to each other.
[0036] like Figure 5As shown, a partition plate 13 is further provided inside the cabinet 1, and the partition plate 13 is vertically fixed inside the cabinet 1. The partition plate 13 is used to separate the first cavity 11 and the second cavity 12. In this embodiment, the second cavity 12 is interconnected with the first cavity 11 on the side close to the experimental table 112 (i.e., the bottom of the partition plate 13), and a connecting port 14 is provided at the bottom of the partition plate 13. The first cavity 11 and the second cavity 12 can be interconnected through the connecting port 14, so the connecting port 14 is closer to the experimental table 112. If toxic gas is generated on the experimental table 112, the gas can enter the connecting port 14 first. A plurality of conducting ports 131 are also provided on the partition plate 13 along the vertical direction. The conducting ports 131 are evenly distributed on the partition plate 13, that is, conducting ports 131 with different high ends are provided on the partition plate 13. The conducting ports 131 are located on the upper side of the connecting port 14, and are also used to connect the first cavity 11 and the second cavity 12. When the gas on the experimental table 112 evaporates too quickly, it can enter the second cavity 12 from the conducting ports 131. Preferably, the conducting ports 131 can be arranged in three rows along the horizontal direction, the sizes of the conducting ports 131 in the middle row are the same and arranged along the vertical direction, and the sizes of the conducting ports 131 in the two side rows arranged along the vertical direction gradually increase, so as to be more in line with the gas attraction mode, which helps to further increase the flow rate and also facilitates the attraction of harmful gases with higher density. In other embodiments, a one-way valve is provided in the conducting port 131, so that the gas in the first cavity 11 can flow into the second cavity 12 in one direction.
[0037] Further, such as Figure 2 , Figure 4 As shown, a guide plate 15 is provided inside the cabinet 1. The guide plate 15 is made of the same corrosion-resistant material as the cabinet 1. The guide plate 15 is used to guide the gas to be discharged. An exhaust port 17 is provided on the top of the cabinet 1. The exhaust port 17 is connected to the second cavity 12 and is used to guide the gas from the second cavity 12. The guide plate 15 is arranged between the exhaust port 17 and the partition plate 13. The guide plate 15 and the top of the second cavity 12 form a channel for guiding the gas to be discharged. Since the guide plate 15 is arranged to be tilted upward, the gas volume guided from the second cavity 12 to the exhaust port 17 in the above-mentioned channel gradually increases, which helps to increase the flow rate of the gas. The two sides of the guide plate 15 are sealed and connected to the inner wall of the first cavity 11 to avoid leakage near the guide plate 15 and reduce the negative pressure suction.
[0038] The negative pressure device 2 is used to generate negative pressure attraction so as to suck out the toxic gas in the cabinet 1. The negative pressure device 2 is arranged on the top of the cabinet 1. Specifically, the negative pressure device 2 has an input end and an output end. The input end of the negative pressure device 2 is connected to the exhaust port 17, and the output end of the negative pressure device 2 can be guided to the outdoors together with the duct. The negative pressure device 2 is preferably a fan, or it can be a device that can generate negative pressure, such as an air pump. It can be seen that the input end of the negative pressure device 2 is connected to the second cavity 12.
[0039] Further, such as Figure 1 As shown, an air collecting hood 16 is connected between the exhaust port 17 and the negative pressure device 2. The air collecting hood 16 is roughly funnel-shaped, and its structure of being narrow at the top and wide at the bottom is conducive to adapting to the shape of the exhaust port 17. Therefore, the air collecting hood 16 reduces the gas passage between the exhaust port 17 and the input end of the negative pressure device 2, making the volume entering the input end of the negative pressure device 2 smaller, which is conducive to increasing the flow rate of the gas and further increasing the suction effect.
[0040] When in use, the negative pressure device 2 is started to generate negative pressure attraction to suck the second cavity 12. The toxic gas generated in the first cavity 11 enters the first cavity 11 through the connecting port 14 or the conducting port 131, and is finally discharged to the outside after passing through the exhaust port 17. It can be seen that the gas in the first cavity 11 enters the second cavity 12 through the connecting port 14 or the conducting port 131 in the horizontal direction and is discharged to the cabinet 1, so that the harmful gas enters the second cavity 12 first. Under the attraction of the negative pressure device 2, the second cavity 12 is conducive to isolating the harmful gas. The smaller volume of the second cavity 12 is conducive to improving the attraction, and the suction effect on the harmful gas is better. Less harmful gas residue in the first cavity 11.
[0041] The lower seat body 3 is connected to the bottom of the cabinet body 1 and can be used as the base of the cabinet body 1. Figure 2 , Figure 3 As shown, the lower seat body 3 has a third cavity 31 inside, which is used to store items required for the experiment, such as chemical reagents, solutions, etc. Of course, the lower seat body 3 is also provided with a movable bottom door structure. Usually, the stored items sometimes volatilize a small amount of harmful gas. The gas in the third cavity 31 can be connected through the first cavity 11 and / or the second cavity 12 to guide the gas to the outside of the cabinet. In this embodiment, the third cavity 31 is connected with the second cavity 12. Specifically, an exhaust channel 32 is provided between the third cavity 31 and the second cavity 12. The exhaust channel 32 can be a pipeline structure, a connecting groove structure, etc. The exhaust channel 32 enables the third cavity 31 to communicate with the second cavity 12. The exhaust channel 32 directly connects with the second cavity 12 to prevent the gas in the third cavity 31 from re-entering the first cavity 11, so as to reduce the problem of residual harmful gas in the first cavity 11. Therefore, when the negative pressure device 2 generates negative pressure attraction, the gas in the third cavity 31 can enter the second cavity 12 along the vertical direction, and finally be output to the outside of the cabinet through the exhaust port 17, further improving the ventilation effect of the high-performance fume hood.
[0042] Further, such as Figure 1As shown, a movable cabinet door 18 is also provided on the cabinet body 1. The cabinet door 18 can slide with the guide rail structure arranged on the inner wall of the cabinet body 1. The cabinet door 18 is made of a material with explosion-proof glass. The cabinet door 18 can move up and down in the vertical direction. The required height can be manually adjusted by the experimenter. The cabinet door 18 is used to cover the first cavity 11 and can make the first cavity 11 form a closed space when necessary. Therefore, the cabinet door 18 adjusts the opening and closing area of the first cavity 11 through its moving action to avoid the test solution splashing out of the cabinet and causing pollution during the experiment.
[0043] Specifically, Figure 4 As shown, the high-performance fume hood also includes a traction group, which is arranged on the cabinet body 1. The traction group includes a traction belt 41, a fixed wheel 42 and a counterweight 43. The traction belt 41 adopts a belt structure with single-sided teeth, which has two ends, a first end connected to the top of the cabinet door 18, and a second end connected to the counterweight 43, for pulling the cabinet door 18; the fixed wheel 42 is arranged on the top of the cabinet body 1, and a support frame 19 is provided on the top of the cabinet body 1. The fixed wheel 42 is fixedly arranged on the support frame 19. There are two fixed wheels 42 of a single traction group. The fixed wheel 42 adopts a directional wheel with a gear structure, which can be abutted and matched with the single-sided tooth structure of the traction belt 41, or the fixed wheel 42 adopts a damping pulley, which has a certain resistance, and can only rotate after overcoming the relative resistance after being driven by the traction belt 41. The counterweight block 43 is arranged on the back of the cabinet body 1 and can move in the vertical direction under the drive of the traction belt 41. Its weight is equivalent to the weight of the cabinet door 18. Usually, the weight of the counterweight block 43 is greater than the weight of the cabinet door 18, so that the cabinet door 18 can move upward under the deadweight of the counterweight block 43 in an emergency to avoid accidental sliding and injuring the experimenter.
[0044] In this embodiment, two traction groups are provided, which are respectively connected to the two sides of the cabinet door 18 to balance the movement of the cabinet door 18 and prevent the cabinet door 18 from tilting when moving, which is beneficial to the synchronization of the movement of the cabinet door 18 and convenient for the experimenter to operate with one hand. When in use, the experimenter can adjust the opening and closing area of the first cavity 11 according to the required height of the cabinet door 18. For example, when the cabinet door 18 is opened to move it upward, the single-sided teeth of the traction belt 41 move on the gear of the fixed wheel 42 and change the abutment position, forming friction resistance with each other, and then under the action of the counterweight block 43, the thrust of the experimenter and the traction force of the counterweight block 43 make the traction belt 41 drive the cabinet door 18 to move, and finally hover at a specific position.
[0045] In some embodiments, a lighting device is provided in the first cavity 11, which includes a lighting tube and a lighting cover, and two sets are provided. The two sets of lighting tubes cooperate with the highly reflective lighting cover to ensure that the illumination of the operating area is not less than 400 Lux.
[0046] In other embodiments, an electric control alarm system is provided on the cabinet 1, including a central control system, a tachometer, a buzzer, a lamp body, a temperature sensor, a display screen and an operating switch. The central control system is electrically connected to the tachometer, the buzzer, the lamp body, the temperature sensor, the display screen and the operating switch. The central control system includes a digital-to-analog converter, a single-chip microcomputer and a peripheral circuit, which is similar to the central control function of an industrial computer. The display screen and the operating switch are arranged on both sides of the cabinet 1. The tachometer is used to detect the speed of the negative pressure device 2, such as the fan. When the speed exceeds the normal operating range, the central control system controls the buzzer to alarm and the lamp body to flash. The temperature sensor is arranged in the first cavity 11. When the temperature sensor detects that the temperature in the first cavity 11 exceeds the normal range, the signal is transmitted to the central control system. The central control system controls the buzzer to alarm and the lamp body to flash, and displays the alarm information on the display screen. Further, the central control system also includes a timing module, which can realize the countdown reminder function, so as to facilitate operators to conduct various precision experiments. Furthermore, the electric control alarm system also includes a position sensor and a motor, which are electrically connected to the central control system. The position sensor is arranged on the cabinet body 1, and also detects the moving position of the cabinet door 18. The output end of the motor is connected to the traction belt 41 for driving. The travel of the cabinet door 18 is automatically controlled by the central control system. When the cabinet door 18 exceeds the set height, the motor is controlled to drive the cabinet door 18 to automatically return to a safe height. This further improves the performance of the fume hood.
[0047] The above description is only a preferred embodiment of the present invention. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. This does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A high performance fume hood, characterized in that: include: A cabinet, wherein the cabinet has a first cavity and a second cavity, the first cavity and the second cavity are arranged side by side in a horizontal direction, the first cavity has a laboratory table, and the second cavity is connected to the first cavity on a side close to the laboratory table; and a negative pressure device, wherein the negative pressure device is disposed on the cabinet, and an input end of the negative pressure device is connected to the second cavity; The negative pressure device generates a negative pressure attraction force, so that the gas in the first cavity enters the second cavity in a horizontal direction and is discharged into the cabinet.
2. The high performance fume hood according to claim 1, characterized in that: A partition plate is provided between the first cavity and the second cavity. The partition plate is provided with a plurality of conducting openings. The gas in the first cavity enters the second cavity through the conducting openings.
3. The high performance fume hood according to claim 2, characterized in that: The cabinet is provided with an exhaust port connected to the second cavity, the negative pressure device is arranged on the exhaust port, a guide plate is connected between the exhaust port and the partition plate, and the guide plate and the second cavity form a channel for guiding gas discharge.
4. The high performance fume hood according to claim 3, characterized in that: An air collecting hood is connected between the exhaust port and the negative pressure device, and the air collecting hood narrows the gas passage between the exhaust port and the input end of the negative pressure device.
5. The high performance fume hood according to claim 1, characterized in that: The cabinet body is provided with a movable cabinet door, and the cabinet door adjusts the opening and closing area of the first cavity through its movement.
6. The high performance fume hood according to claim 5, characterized in that: Also included is a traction group, the traction group comprising: A traction belt, a first end of which is connected to the cabinet door; A fixed wheel, the fixed wheel being arranged on the cabinet; a counterweight block, to which the second end of the traction belt is connected; The cabinet door is positioned on the cabinet body through the traction group.
7. The high performance fume hood according to claim 6, characterized in that: The traction groups are provided with at least two groups, and the traction groups are respectively connected to the two sides of the cabinet door to balance the movement of the cabinet door.
8. The high performance fume hood according to claim 1, characterized in that: It also includes a lower seat body, which is connected to the bottom of the cabinet body and has a third cavity for storing items.
9. The high performance fume hood according to claim 8, characterized in that: The third cavity is communicated with the first cavity and / or the second cavity, and the negative pressure device generates a negative pressure attraction force, so that the gas in the third cavity enters the first cavity and / or the second cavity in a vertical direction.
10. The high performance fume hood according to claim 9, characterized in that: An exhaust passage is provided between the third cavity and the first cavity and / or the second cavity, and the third cavity is communicated with the first cavity and / or the second cavity through the exhaust passage.