A fume hood

Abstract

The present invention discloses a fume hood, comprising a cabinet body, provided with an operating chamber; a ventilation pipe arranged in the operating chamber, comprising an air inlet section, a guide section and an air outlet section, wherein the bottom surface of the air inlet section is in close contact with the inner bottom surface of the operating chamber, the rear side surface of the guide section is in close contact with the rear end inner wall of the operating chamber, the upper end surface of the air outlet section is in close contact with the upper end inner wall of the operating chamber, the left and right sides of the ventilation pipe are in close contact with the left and right inner walls of the operating chamber, the air inlet of the air inlet section faces forward, and the air outlet of the air outlet section faces upward. By arranging the ventilation pipe in the fume hood, dust can enter from a single inlet to prevent dust from being raised during the experiment. At the same time, the side of the ventilation pipe is in close contact with the inner wall of the operating chamber to leave more operating space. The air inlet faces forward to ensure that the dust has the shortest travel when entering the ventilation pipe, thereby increasing the dust removal efficiency. The bottom surface of the air inlet section is in close contact with the bottom surface of the operating chamber, so that dust can enter from the bottom surface of the operating chamber to prevent dust from being raised.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, in particular to a fume hood. Background Art

[0002] When conducting experiments in the laboratory, harmful gases are often produced during the experiment. In order to prevent the harmful gases from harming the human body, the harmful gases must be discharged. Laboratories often use fume hoods to discharge the harmful gases produced during the experiment.

[0003] In the past, fume hoods absorbed and discharged harmful gases through a guide plate installed inside the cabinet and a negative pressure fan installed on the top of the cabinet. Since the previous fume hoods were equipped with multiple guide plates, there was a gap between each two adjacent guide plates, and the gap formed an air inlet. Since there were multiple air inlets, it was more convenient to absorb harmful gases. However, when absorbing dust, multiple air inlets caused dust to float everywhere, affecting the operation of the experimenters. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fume hood that can prevent dust from being raised when absorbing dust.

[0005] A fume hood according to an embodiment of the first aspect of the present invention comprises a cabinet body provided with an operating chamber; a ventilation duct arranged in the operating chamber, comprising an air inlet section, a guide section and an air outlet section, the bottom surface of the air inlet section is in close contact with the inner bottom surface of the operating chamber, the rear side surface of the guide section is in close contact with the rear end inner side wall of the operating chamber, the upper end surface of the air outlet section is in close contact with the upper end inner side wall of the operating chamber, the left and right sides of the ventilation duct are in close contact with the left and right inner side walls of the operating chamber, the air inlet of the air inlet section faces the operating station in front of the operating chamber, and the air outlet of the air outlet section faces the ventilation port above the cabinet body.

[0006] A fume hood according to an embodiment of the present invention has at least the following beneficial effects: by arranging the ventilation duct in the fume hood, dust can enter from a single inlet to prevent dust from being raised during the experiment; at the same time, the side of the ventilation duct is in close contact with the inner wall of the operating chamber to leave more operating space; the air inlet faces forward to ensure that the dust has the shortest distance when entering the ventilation duct, thereby increasing the dust removal efficiency; the bottom surface of the air inlet section is in close contact with the bottom surface of the operating chamber, so that dust can enter from the bottom surface of the operating chamber to prevent dust from being raised.

[0007] According to some embodiments of the present invention, the inner wall of the connection between the air inlet section and the guide section is provided with a transition arc surface, which can prevent dust from accumulating at the connection between the air inlet section and the guide section and clogging the ventilation pipe.

[0008] According to some embodiments of the present invention, the area of ​​the air outlet is larger than the area of ​​the air inlet, so as to increase the dust flow rate at the air inlet under the same negative pressure and facilitate dust collection.

[0009] According to some embodiments of the present invention, the inner wall of the air outlet is provided with a first slope, which slopes downward from front to back, and the first slope can prevent dust from accumulating and blocking the air outlet.

[0010] According to some embodiments of the present invention, the inner wall of the ventilation duct is provided with a plurality of guide structures, which can allow a mixture of dust and air to flow smoothly through the ventilation duct, thereby reducing dust adhering to the inner wall of the ventilation duct.

[0011] According to some embodiments of the present invention, the air inlet is provided with a plurality of drainage gaps, the plurality of drainage gaps are correspondingly connected to a plurality of the guide structures, and the drainage gaps are connected to the operating cavity to facilitate the entry of dust in the operating cavity.

[0012] According to some embodiments of the present invention, a baffle is hinged inside the air inlet, and the baffle is used to adjust the amount of air entering from the air inlet.

[0013] According to some embodiments of the present invention, the lower edge of the air inlet is configured as a second slope that slopes downward and forward, and the second slope can guide dust into the ventilation duct along the slope to prevent dust from accumulating at the lower edge of the air inlet.

[0014] According to some embodiments of the present invention, a negative pressure fan is further included, wherein an input end of the negative pressure fan is connected to the air outlet, and the negative pressure fan is used to provide negative pressure to absorb dust.

[0015] According to some embodiments of the present invention, a storage bin is further included, which is arranged at the lower end of the cabinet body. A door opening is opened in the front of the cabinet body. A cabinet door is slidably connected to the door opening. The cabinet door can open and close the door opening by sliding vertically. The storage bin can be used to store experimental equipment.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A schematic diagram of the structure of a fume hood according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view of a fume hood in a three-dimensional perspective is shown;

[0020] Figure 3 for Figure 1 A cross-sectional view of a fume hood is shown;

[0021] Figure 4 for Figure 1 A schematic diagram of the structure of the ventilation duct of the fume hood is shown;

[0022] Figure 5 for Figure 1 A cross-sectional view showing a perspective view of the ventilation duct of a fume hood.

[0023] Cabinet 100, cavity 110, ventilation duct 200, air inlet section 210, air outlet section 220, air inlet 211,

[0024] The air outlet 221, the transition arc surface 230, the first inclined surface 221a, the flow guide structure 240, the second inclined surface 211a,

[0025] Drainage gap 211b, shield 211c, fan 300, storage bin 400, door opening 120, cabinet door 130 DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figures 1 to 5 A fume hood comprises a cabinet body 100 and a ventilation duct 200, wherein the cabinet body 100 is provided with an operating chamber 110; the ventilation duct 200 is arranged in the operating chamber 110, and the ventilation duct 200 comprises an air inlet section 210, a guide section 250 and an air outlet section 220, wherein the bottom surface of the air inlet section 210 is in close contact with the inner bottom surface of the operating chamber 110, the rear side surface of the guide section 250 is in close contact with the rear end inner side wall of the operating chamber 110, the upper end surface of the air outlet section 220 is in close contact with the upper end inner side wall of the operating chamber 110, the left and right sides of the ventilation duct 200 are in close contact with the left and right inner side walls of the operating chamber 110, the air inlet 211 of the air inlet section 210 faces the operating station in front of the operating chamber 110, and the air outlet 221 of the air outlet section 220 faces the air vent above the cabinet body (100). By arranging a ventilation duct 200 in the fume hood, dust can enter from a single inlet to prevent dust from being raised during the experiment. At the same time, the side of the ventilation duct 200 is close to the inner wall of the operating chamber 110 to leave more operating space. The air inlet 211 is facing the operating station in front of the operating chamber 110, which can ensure that the dust has the shortest distance when entering the ventilation duct 200, thereby increasing the dust removal efficiency. The bottom surface of the air inlet section 210 is close to the bottom surface of the operating chamber 110, so that dust can enter from the bottom surface of the operating chamber 110 and prevent dust from being raised.

[0031] It should be noted that the operating cavity 110 is rectangular, and the width of the outer contour of the ventilation duct 200 in the left-right direction is 1mm to 2mm smaller than the width of the rectangle of the operating cavity 110 in the left-right direction, and the vertical height of the outer contour of the ventilation duct 200 is 1mm to 2mm smaller than the vertical height of the rectangle of the operating cavity 110, that is, the ventilation duct 200 can be filled into the operating cavity 110, and the gap at the contact point between the operating cavity 110 and the ventilation duct 200 is reduced.

[0032] It should be noted that the air outlet 221 is set to be circular and the air inlet 211 is set to be rectangular. The rectangular air inlet 211 can ensure the dust suction width, that is, the dust within the width of the operating chamber 110 can enter the air inlet 211; the air outlet 221 is set to be circular to facilitate the connection of the dust suction pipe.

[0033] In some embodiments, the inner wall of the connection between the air inlet section 210 and the guide section 250 is provided with a transition camber 230, and the transition camber 230 can prevent dust from accumulating at the connection between the air inlet section 210 and the guide section 250 and blocking the ventilation duct 200. It can be understood that one end of the transition camber 230 is connected to the inner bottom surface of the air inlet section 210, and the other end is connected to the rear end inner wall of the guide section 250, and the inner bottom surface of the air inlet section 210 and the rear end inner wall of the guide section 250 are both tangent to the connection between the transition camber 230; it should be noted that the transition camber 230 can also play a role in reducing the vortex effect of the air-dust mixture between the air inlet section 210 and the guide section 250, so that the air-dust mixture flows more stably in the ventilation duct 200.

[0034] In some embodiments, the area of ​​the air outlet 221 is larger than the area of ​​the air inlet 211, which is convenient for increasing the dust flow rate at the air inlet 211 under the same negative pressure and facilitating dust collection. It should be understood that when the area of ​​the air inlet 211 is smaller than the area of ​​the air outlet 221 under the same negative pressure, the flow rate of the air-dust mixture at the air inlet 211 will become faster. According to the continuity equation Q=Sv=C, where C is a constant, Q is a flow rate, S is a cross-sectional area, and v is a flow rate, that is, when an ideal fluid flows steadily, the volume flow rates of each cross section in the tube are equal; under the same negative pressure, the fluid in the tube can be guaranteed to flow steadily, that is, when the area of ​​the air outlet 221 is larger than the area of ​​the air inlet 211, the flow rate of the air-dust mixture at the air inlet 211 is greater than the flow rate at the air outlet 221. It should be understood that although the air-dust mixture is not an ideal fluid, the continuity equation can satisfy the relationship between the cross section and the flow rate.

[0035] In some embodiments, the inner wall of the air outlet 221 is provided with a first slope 221a, and the first slope 221a is inclined downward from front to back. The first slope 221a can prevent dust accumulation from blocking the air outlet 221. It should be noted that the inclination angle of the slope is between 45° and 60° when observed from a left perspective. This inclination angle is determined according to the length of the air outlet section 220 in the front and rear directions. The first slope 221a is set because the space of the air outlet section 220 is too large. Compared with setting the inner wall of the front end of the air outlet section 220 to a vertical type, the first slope 221a is not easy to cause dust to accumulate.

[0036] In some embodiments, the inner wall of the ventilation duct 200 is provided with a plurality of guide structures 240. The guide structures 240 can make the mixture of dust and air flow smoothly through the ventilation duct 200, thereby reducing the dust attached to the inner wall of the ventilation duct 200. It should be noted that the guide structure 240 can be a guide groove or a guide ridge; when the guide structure 240 is a guide groove, the guide groove plays a guiding role, and the depth of the guide groove is between 0.25mm and 0.5mm; when the guide structure 240 is a guide ridge, the channel between two adjacent guide ridges plays a guiding role, and the height of the guide ridge is between 0.25mm and 0.5mm.

[0037] In some embodiments, the air inlet 211 is provided with a plurality of drainage gaps 211b, and the plurality of drainage gaps 211b are connected to a plurality of guide structures 240 in correspondence. The drainage gaps 211b are connected to the operating chamber 110 to facilitate the entry of dust in the operating chamber 110. It can be understood that the drainage gaps 211b are mainly used to guide the flow direction of the mixture of air and dust, standardize the flow direction of the mixture of air and dust at the drainage gaps 211b, and then guide the mixture of air and dust out of the operating chamber 110 through the guide structure 240. The drainage gaps 211b are connected to the guide structures 240 in correspondence, with the aim of enabling the guide structure 240 to immediately guide the air-dust mixture entering from the drainage gaps 211b.

[0038] In some embodiments, a baffle 211c is hinged in the air inlet 211, and the baffle 211c is used to adjust the air volume entering from the air inlet 211, that is, the air inlet area of ​​the air inlet 211 is adjustable, and is used to increase or decrease the amount of air-dust mixture entering the ventilation duct 200 from the air inlet 211, so as to prevent the amount of air-dust mixture entering the ventilation duct 200 from being too large, resulting in dust accumulation, and also to prevent the amount of air-dust mixture entering the ventilation duct 200 from being too small, resulting in the dust not being absorbed in time. In some embodiments, a handle is connected to the left end and / or the right end of the baffle 211c, and the handle can conveniently adjust the opening and closing degree of the baffle. It should be understood that the handle is arranged outside the cabinet 100, that is, the baffle 211c is also hinged to the cabinet 100; a block is also arranged on the cabinet 100, and the block is used to block the handle to maintain the position of the baffle 211c.

[0039] In some embodiments, the lower edge of the air inlet 211 is configured as a second slope 211a that is inclined from top to bottom and forward. The second slope 211a can guide dust along the slope into the ventilation duct 200 to prevent dust from accumulating at the lower edge of the air inlet 211. The second slope 211a is intended to maintain a smooth transition between the lower edge of the air inlet 211 and the lower inner wall of the operating chamber 110 to prevent dust from accumulating at the lower edge of the air inlet 211 and affecting the cleanliness of the operating chamber 110.

[0040] In some embodiments, a negative pressure fan 300 is also included, and the input end of the negative pressure fan 300 is connected to the air outlet 221. The negative pressure fan 300 is used to provide negative pressure to absorb dust. It should be understood that the power of the negative pressure fan is constant and the negative pressure generated is unchanged.

[0041] In some embodiments, a storage bin 400 is further included. The storage bin 400 is disposed at the lower end of the cabinet body 100. A door opening 120 is provided in the front of the cabinet body 100. A cabinet door 130 is slidably connected to the door opening 120. The cabinet door 130 can slide vertically to open and close the door opening 120. The storage bin 400 can be used to store experimental equipment. It should be understood that the storage bin 400 is connected to a bin door.

[0042] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A fume hood, characterized in that: include: The cabinet (100) is provided with an operating chamber (110); The ventilation duct (200) is arranged in the operating chamber (110), comprising an air inlet section (210), a flow guide section (250) and an air outlet section (220); the bottom surface of the air inlet section (210) is in close contact with the inner bottom surface of the operating chamber (110); the rear side surface of the flow guide section (250) is in close contact with the rear inner side wall of the operating chamber (110); the upper end surface of the air outlet section (220) is in close contact with the upper inner side wall of the operating chamber (110); the left and right sides of the ventilation duct (200) are in close contact with the left and right inner side walls of the operating chamber (110); the air inlet (211) of the air inlet section (210) faces the operating station in front of the operating chamber (110); and the air outlet (221) of the air outlet section (220) faces the ventilation opening above the cabinet (100); The inner wall of the air outlet (221) is provided with a first inclined surface (221a), the first inclined surface (221a) being inclined downward from front to back, the inner wall of the ventilation pipe (200) is provided with a plurality of flow guiding structures (240), the air inlet (211) is provided with a plurality of flow guiding notches (211b), and the plurality of flow guiding notches (211b) are connected to the plurality of flow guiding structures (240) in a one-to-one correspondence.

2. A fume hood according to claim 1, characterized in that: The inner wall of the connection between the air inlet section (210) and the flow guide section (250) is provided with a transition cambered surface (230).

3. A fume hood according to claim 1, characterized in that: The air outlet (221) is larger than the air inlet (211).

4. A fume hood according to claim 1, characterized in that: A baffle (211c) is hingedly connected inside the air inlet (211), and the baffle (211c) is used to adjust the amount of air entering from the air inlet (211).

5. A fume hood according to claim 1, characterized in that: The lower edge of the air inlet (211) is arranged as a second inclined surface (211a) that slopes downward and forward.

6. A fume hood according to claim 1, characterized in that: It also comprises a negative pressure fan (300), the input end of the negative pressure fan (300) being connected to the air outlet (221), and the negative pressure fan (300) being used to absorb dust.

7. A fume hood according to claim 1, characterized in that: The cabinet (100) further comprises a storage bin (400), wherein the storage bin (400) is arranged at the lower end of the cabinet body (100), a door opening (120) is provided in front of the cabinet body (100), a cabinet door (130) is slidably connected to the door opening (120), and the cabinet door (130) can open and close the door opening (120) by sliding vertically.

Images