CN115007590B

CN115007590B - Fume chamber

Info

Publication number: CN115007590B
Application number: CN202210690117.1A
Authority: CN
Inventors: 卢丙利; 阮红正
Original assignee: E3 Green Technology Co ltd
Current assignee: E3 Green Technology Co ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-11-10
Anticipated expiration: 2042-06-17
Also published as: CN117225855A; CN115007590A

Abstract

The invention discloses a fume hood, which comprises a hood body, an air supplementing system and an upper air supplementing module, wherein an upper outer air supplementing port is arranged towards a partition channel at the top side of an inner cavity, the upper outer air supplementing port is not used for supplementing air from outside a window, and the lower air supplementing module is used for supplementing air from outside the window; at least 80% of the air supply quantity from the lower air supply module enters the air exhaust channel from the lower air exhaust area and a first air exhaust gap between the lower section guide plate and the bottom side of the inner cavity; at least 80% of the outdoor air supply quantity from the front opening enters the air exhaust channel from the middle air exhaust area and the second air exhaust gap between the middle section guide plate and the lower section guide plate; at least 80% of the make-up air from the upper make-up module enters the exhaust channel from the return channel. The invention can improve the air flow structure of the inner cavity and prevent the leakage of pollutants of the fume hood.

Description

Fume chamber

Technical Field

The invention relates to the technical field of ventilation, in particular to a fume hood.

Background

Ventilation devices can be generally described as devices for exhausting gases such as exhaust gases, harmful gases and particulate matters in a working space to outside (usually outdoors) the working space, and such devices have wide application in industry and life, for example, factory buildings for generating toxic harmful gases or particulate matters in industrial production, biological and chemical laboratories of research and development institutions, kitchen for generating cooking fume, etc., which require ventilation devices to isolate toxic gases and particulate matters in a working space from users, prevent users from inhaling toxic harmful gases and particulate matters, and exhaust toxic harmful gases and particulate matters to outside.

Fume hoods are important devices in laboratories to control contaminants. The function of the control cabinet is that pollutants emitted in the control cabinet are smoothly discharged outdoors, and the pollutants cannot be dissipated indoors through an operation port of the ventilation cabinet, so that the health and safety of experimental staff are endangered.

However, the existing fume hood has the phenomenon of pollutant overflow.

Disclosure of Invention

The invention aims to solve the technical problem that pollutants overflow in a fume hood. The invention provides a fume hood, which is characterized in that an upper air supplementing module with an upper inner air supplementing opening and an upper outer air supplementing opening is arranged, the upper outer air supplementing opening supplements air to a blocking channel, pollutants on the inner side of a window are cleaned and diluted, the top bypass air inlet speed is accelerated, the pollutants are prevented from overflowing through a bypass, and the aggregation of inert flow on the inner side of the window is eliminated.

In order to solve the technical problems, an embodiment of the invention discloses a fume hood, which comprises: the cabinet body is provided with an inner cavity, the inner cavity forms a working cavity, and a front opening which is opened to the indoor environment is formed at the front side of the inner cavity; the air supplementing system is used for supplementing air to the fume hood; the upper air supplementing module is arranged on the top side of the inner cavity and communicated with the air supplementing system, the upper air supplementing module comprises an upper inner air supplementing opening and an upper outer air supplementing opening, the upper inner air supplementing opening is arranged towards the working cavity, the upper outer air supplementing opening is arranged towards a partition channel on the top side of the inner cavity, and the upper outer air supplementing opening is not used for supplementing air from outside the window; the lower air supplementing module is arranged at the bottom side of the inner cavity and communicated with the air supplementing system, and comprises a lower air supplementing port which is arranged at least towards the working cavity; the air exhaust device comprises an inner cavity, and is characterized by further comprising a lower section guide plate, a middle section guide plate and an upper section guide plate which are arranged along the height direction, wherein the lower section guide plate, the middle section guide plate and the upper section guide plate are arranged at intervals with the rear inner lining plate of the inner cavity so as to form an air exhaust channel, and the air exhaust channel is communicated with an air exhaust system; a lower exhaust area is arranged on the lower section guide plate, and a middle exhaust area is arranged on the middle section guide plate; the upper section guide plate comprises an extension section, the extension section and the middle section guide plate are arranged at intervals along the depth direction to form a rotary channel, and the rotary channel extends along the height direction and is communicated with the exhaust channel; at least 80% of the make-up air volume from the lower make-up air module enters the exhaust channel from the lower exhaust area and a first exhaust gap between the lower baffle and the bottom side of the inner cavity; at least 80% of the outdoor air supply quantity from the front opening enters the air exhaust channel from the second air exhaust gap between the middle air exhaust area and the middle section guide plate and the lower section guide plate; at least 80% of the make-up air volume from the upper make-up air module enters the exhaust channel from the swivel channel.

By adopting the technical scheme, the air flow structure of the inner cavity is improved, and the leakage of pollutants of the fume hood is prevented.

According to another embodiment of the present invention, further comprising: the partition piece is arranged at the front opening and is positioned at the top side of the inner cavity, and the partition piece and the bottom side of the inner cavity are arranged at intervals along the height direction of the cabinet body; the window is arranged at the outer side of the partition piece, can move upwards or downwards along the height direction, is arranged at intervals with the partition piece along the depth direction of the cabinet body, and forms a partition channel, and the partition channel is communicated with the inner cavity; the upper inner air supplementing opening is arranged towards the working cavity, and the upper outer air supplementing opening is arranged towards the partition channel.

According to another embodiment of the present invention, the upper air supply module includes: the upper air supplementing box body is provided with an upper air supplementing cavity and an air inlet communicated with the upper air supplementing cavity, the upper air supplementing cavity is provided with a pore plate, external air enters the upper air supplementing cavity from the air inlet, and flows out of the upper air supplementing box body from the upper inner air supplementing opening and the upper outer air supplementing opening respectively after passing through the pore plate.

According to another specific embodiment of the invention, the upper air supplementing cavity comprises a first upper air supplementing cavity and a second upper air supplementing cavity, the air inlet is communicated with the first upper air supplementing cavity, and the upper inner air supplementing opening and the upper outer air supplementing opening are respectively communicated with the second upper air supplementing cavity; the orifice plate comprises a guide plate, and the guide plate is positioned between the first upper air supplementing cavity and the second upper air supplementing cavity; external air enters the first upper air supplementing air cavity from the air inlet, enters the second upper air supplementing air cavity after passing through the guide plate, and flows out of the upper air supplementing box body from the upper inner air supplementing opening and the upper outer air supplementing opening respectively.

According to another specific embodiment of the invention, the box body comprises a top plate, an arc plate, a connecting plate and a bottom plate, wherein the arc plate is arranged facing the inner cavity, the connecting plate extends along the height direction and is arranged back to the inner cavity, the upper inner air supplementing opening is arranged on the arc plate, and the upper outer air supplementing opening is arranged on the bottom plate;

the air inlet is arranged on the top plate along the height direction, and the second upper air supplementing air cavity is positioned below the first upper air supplementing air cavity;

the guide plate comprises a first inclined section, the first inclined section is connected with the connecting plate in an upward inclined mode, and the first inclined section is provided with a plurality of air filtering holes.

According to another specific embodiment of the invention, along the height direction, the first inclined section and the air inlet are staggered, and the first inclined section and the upper outer air supplementing opening are arranged opposite.

According to another embodiment of the invention, the air conditioner further comprises a third upper air supplementing cavity, the third upper air supplementing cavity is communicated with the second upper air supplementing cavity, the pore plate further comprises an upper air supplementing air filtering plate, and the upper air supplementing air filtering plate is located between the second upper air supplementing cavity and the third upper air supplementing cavity.

According to another specific embodiment of the invention, the bottom plate is further provided with an extension channel in a protruding mode, the inner cavity of the extension channel forms a third upper air supplementing cavity, the third upper air supplementing cavity is communicated with the second upper air supplementing cavity, and the end portion of the extension channel is provided with the upper air outlet.

According to another specific embodiment of the present invention, the air output of the second upper air-supplementing air chamber is greater than the air output of the third upper air-supplementing air chamber.

According to another embodiment of the invention, the upper air compensating box is arranged between the partition piece and the top lining plate of the inner cavity, and the partition piece supports the upper air compensating box.

According to another specific embodiment of the invention, the air supplementing system comprises an air supplementing channel arranged at the top of the cabinet body, an air outlet is formed in the bottom of the air supplementing channel, a first air passing channel is formed in a top lining plate of the inner cavity, the top lining plate is located between the air supplementing channel and the upper air supplementing box body, and the air outlet, the first air passing channel and the air inlet are communicated.

According to another embodiment of the present invention, the air supply device further comprises a lifting block, wherein the lifting block is located between the air supply channel and the top lining plate along the height direction, and the air supply channel and the top lining plate are arranged at intervals and form a wire passing channel; the elevating block is provided with a second air passage, and the air outlet, the first air passage, the second air passage and the air inlet are communicated.

According to another embodiment of the present invention, the method further comprises: the side air supplementing module comprises a side air outlet which is arranged towards the rear side of the inner cavity, and the side air supplementing module is communicated with the air supplementing system.

According to another embodiment of the invention, the lower and/or upper air make-up modules are in communication with the side air make-up modules to provide air make-up airflow to the air cavities of the side air make-up modules.

According to another embodiment of the invention, the ventilation cabinet further comprises a left upright post and a right upright post, and the lower air supplementing module is positioned between the left upright post and the right upright post along the width direction of the ventilation cabinet;

the inner cavity comprises a left inner lining plate and a right inner lining plate, the left inner lining plate is arranged on one side of the left upright post facing the rear side of the inner cavity, and the right inner lining plate is arranged on one side of the right upright post facing the rear side of the inner cavity;

the left upright post comprises a left upright post first air inlet and a left upright post air supplementing cavity extending along the height direction, a left upright post air outlet is formed in the part, facing the inner cavity, of the left upright post, the left upright post air supplementing cavity is communicated with the air supplementing system through the left upright post air outlet, and the left upright post air outlet is communicated with the left upright post air supplementing cavity; and/or the number of the groups of groups,

the right upright post comprises a right upright post first air inlet and a right upright post air supplementing cavity extending along the height direction, a right upright post air outlet is formed in the part, facing the inner cavity, of the right upright post, the right upright post air supplementing cavity is communicated with the air supplementing system through the right upright post air outlet, and the right upright post air outlet is communicated with the right upright post air supplementing cavity;

The side air supplementing module comprises the left upright post air supplementing cavity, the left upright post air outlet and the left upright post first air inlet; and/or the side air supplementing module comprises the right upright post air supplementing cavity, the right upright post air outlet and the right upright post first air inlet.

According to another specific embodiment of the invention, the left upright further comprises a left upright side air supplementing air filtering plate extending along the height direction, the left upright side air supplementing air filtering plate divides the left upright air supplementing cavity into a left upright front air supplementing cavity and a left upright rear air supplementing cavity, the left upright air outlet is communicated with the left upright front air supplementing cavity, and the left upright first air inlet is communicated with the left upright rear air supplementing cavity; and/or the number of the groups of groups,

the right stand still include the edge the right stand side air supply air filter plate that the direction of height extends, right stand side air supply air filter plate will the air supply chamber of right stand divides into before the air supply chamber of right stand and the air supply chamber behind the right stand, right stand air outlet with the air supply chamber intercommunication before the right stand, right stand first air intake with the air supply chamber intercommunication behind the right stand.

According to another embodiment of the invention, the extension and the middle deflector are arranged in parallel.

According to another embodiment of the invention, the depth of the swivel channel is 20mm to 1m in the height direction.

According to another specific embodiment of the invention, a lower air outlet is arranged between the two side edges of the other end of the lower section guide plate and the left lining plate and the right lining plate of the inner cavity, and a middle air outlet is arranged between the two side edges of the one end of the middle section guide plate and the left lining plate and the right lining plate of the inner cavity; along the depth direction of fume chamber, the projection of lower air exit with the projection of well air exit is followed the hypomere guide plate with the adjacent wiring symmetry of middle section guide plate.

According to another specific embodiment of the invention, along the width direction of the fume chamber, first gaps are respectively arranged between the two side edges of the other end of the lower section of the flow guide plate and the left lining plate and the right lining plate of the inner cavity, and the first gaps gradually increase from bottom to top;

along the width direction of fume chamber, the middle section guide plate the both sides limit of one end with have the second clearance respectively between the left interior welt of inner chamber and the right interior welt, the second clearance from bottom to top diminishes gradually.

According to another embodiment of the present invention, the air supply system includes:

the air supplementing channel is arranged at the top of the cabinet body and is provided with an air inlet;

the air inlet channel is communicated with the air supplementing channel, extends along the height direction and is positioned at the rear side of the cabinet body, and the working cavity is positioned between the air inlet channel and the lower air supplementing opening along the depth direction of the cabinet body;

the adjusting channel extends along the depth direction of the cabinet body and is provided with an inlet and an outlet along the depth direction, and the inlet of the adjusting channel is communicated with the outlet of the air inlet channel;

the upper air supplementing module comprises an air outlet channel, the air outlet channel is provided with the lower air supplementing port, and an inlet of the air outlet channel is connected with an outlet of the adjusting channel.

Drawings

FIG. 1 shows a front view of a fume hood in accordance with an embodiment of the present invention;

FIG. 2 shows a side view I of a fume hood of an embodiment of the present invention;

FIG. 3 shows a cross-sectional view of a fume hood according to an embodiment of the invention;

FIG. 4 shows a second cross-sectional view of a fume hood according to an embodiment of the invention;

FIG. 5 shows a second side view of a fume hood of an embodiment of the present invention;

FIG. 6 shows a perspective view of a make-up air module in a fume hood according to an embodiment of the invention;

FIG. 7 illustrates a cross-sectional view of an upper plenum module in a fume hood in accordance with an embodiment of the invention;

FIG. 8 illustrates a side view of an upper plenum module in a fume hood according to an embodiment of the invention;

FIG. 9 shows a second perspective view of a make-up air module in a fume hood according to an embodiment of the invention;

FIG. 10 shows a perspective view of the air make-up channel and the raised block in the fume hood of an embodiment of the present invention;

FIG. 11 illustrates a third perspective view of a make-up module in a fume hood according to an embodiment of the present invention;

FIG. 12 shows a top view of a first embodiment of the fume hood of the present invention;

FIG. 13 is an enlarged view of portion A of FIG. 12;

FIG. 14 illustrates a fourth perspective view of a make-up air module in a fume hood according to an embodiment of the present invention;

FIG. 15 shows a second top view of a fume hood according to an embodiment of the invention;

FIG. 16 is an enlarged view of portion B of FIG. 15;

FIG. 17 illustrates a side view of a baffle in a fume hood according to an embodiment of the present invention;

fig. 18 shows a schematic view of the airflow organization within a fume hood according to an embodiment of the invention.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description contains many specific details for the purpose of providing a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention.

The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 5, the present application provides a fume hood 1 comprising a hood body 10. The cabinet 10 has a top liner 101, a bottom liner 102, a rear liner 103, a left liner 105 (see fig. 17), and a right liner 104. Wherein the top lining board 101 and the bottom lining board 102 are disposed opposite to each other in the height direction (Z direction in fig. 1 to 5) of the fume hood 1, the left lining board 105 and the right lining board 104 are disposed opposite to each other in the width direction (X direction in fig. 1) of the fume hood 1, and the top lining board 101 is located at the rear side of the fume hood 1 in the depth direction (Z direction in fig. 2 to 4) of the fume hood 1. The top liner panel 101, the bottom liner panel 102, the rear liner panel 103, the left liner panel 105, and the right liner panel 104 define an inner chamber S of the cabinet 10, the inner chamber S constitutes a working chamber (S shown in fig. 2, 3, and 5) of the fume hood 1, and a front opening 1a that is opened to the indoor environment is formed on a front side (a side opposite to the rear liner panel 103 in the depth direction) of the inner chamber S. Illustratively, the front opening 1a serves as an operation port.

Illustratively, in this embodiment, a base cabinet 13 is provided below the cabinet 10 (i.e., below the interior chamber S), and the base cabinet 13 can be used to store reagents and materials required for the experiment. In fig. 1, three base cabinets 13 are shown below the cabinet body 10, but the number of the base cabinets 13 is not limited thereto, and a corresponding number of base cabinets 13 may be provided according to actual use requirements.

When the fume hood 1 is placed in an indoor environment, the front opening 1a of the cabinet 10 faces the user's work, and a partition 13 and a window 14 are provided at the front opening 1a of the cabinet 10. Referring to fig. 2 to 5, the partition 13 extends in the width direction of the cabinet 10 (see fig. 3 and 4), is located on the top side of the inner chamber S (below the top interior lining 101), and is spaced apart from the bottom side of the inner chamber S (e.g., the bottom interior lining 102) in the height direction of the cabinet 10. Fig. 5 shows that the partition 13 is arranged obliquely. In some possible embodiments, the partition 13 is arranged vertically. Illustratively, the partition 13 is connected with the left and right inner liners 105 and 104 in the width direction. The partition 13 is, for example, a partition glass.

The window 14 is disposed outside the partition 13, and the window 14 can move upward along the height direction of the cabinet 10 to open the front opening 1a, or the window 14 can move downward along the height direction of the cabinet 10. That is, the window 14 can be moved upward or downward with respect to the partition 13 in the height direction of the cabinet 10. In this embodiment, the window 14 and the partition member 13 are disposed at intervals in the depth direction of the cabinet 10, and a partition passage P1 (bypass) is formed, and the partition passage P1 communicates with the inner chamber S. Wherein the partition path P1 extends in the width direction of the fume hood 1 (shown in fig. 3 and 4).

In some possible embodiments, referring to fig. 3 and 4, the fume hood 1 of the present application further comprises a door lintel panel 141, the door lintel panel 141 being located at the top of the outside of the window 14 of the cabinet 10. That is, in the depth direction, the window 14 is located between the partition 13 and the lintel plate 141.

With continued reference to fig. 2-5, the fume hood 1 of the present application further includes a ventilation system 40 and an exhaust system 50. The air supply system 40 is used for supplying air to the inner cavity S of the fume hood 1 (for example, supplying air to each air supply module, and the air supply flow is shown as B). The exhaust system 50 is for exhausting air (shown as Q1 in fig. 5) that has entered the working chamber through the front opening 1a, air (shown as Q2, Q3, Q4, and Q5 in fig. 5) that has entered the working chamber through the air supply system 40, and a partition passage P1 described later, from the working chamber (exhaust air flow shown as P). Wherein Q4 is derived from a side air make-up module (e.g., a post) described in detail below.

In the embodiment of the present application, the fume hood 1 further includes an upper air compensating module 20 and a lower air compensating module 30. Wherein, the upper air compensating module 20 is disposed on the top side of the inner cavity S (for example, below the top lining board 101) and is communicated with the air compensating system 40, the upper air compensating module 20 includes an upper inner air compensating port 21 and an upper outer air compensating port 22, and the upper inner air compensating port 21 is disposed towards the working cavity and is located in the space between the rear lining board 103 and the partition member 13; the upper outer air supply port 22 is disposed toward the partition path P1, and the upper outer air supply port 22 is located within the partition path P1, for example. Illustratively, the upper inner and outer supply ports 21 and 22 described above extend in the width direction of the fume hood 1, respectively.

Illustratively, in the width direction, the upper inner air supply port 21 can supply air obliquely downward or horizontally or vertically downward toward the inside of the working chamber (shown as Q2 and Q6 in fig. 5). By the arrangement, a flow guide channel is formed at the upper part of the inner cavity S, vortex is reduced, the vortex is pushed to the back part of the cabinet body 10, the vortex is far away from a user, the pollution discharge efficiency at the top is accelerated, the stay time of pollutants is shortened, and the high-density aggregation of the pollutants is reduced.

The present application is provided with the upper outer air supply port 22, and the upper outer air supply port 22 can supply air to the partition path P1 in the width direction (shown as Q5 in fig. 5), that is, the outside of the window 14 of the fume hood 1 of the present application is not provided with the air supply structure, and the upper outer air supply port 22 supplies air not from the outside of the window 14 but from the partition path P1 between the window 14 and the partition member 13. After the arrangement, the air supply of the upper outer air supply port 22 can clean and dilute pollutants on the inner side of the window 14, quicken the air inlet speed of the top bypass (partition channel P1), prevent the pollutants from overflowing through the bypass, eliminate the aggregation of inert flow on the inner side of the window 14 and improve the safety of a user using the fume hood 1.

In some possible embodiments, the height of the upper outer supply port 22 to the bottom side of the inner chamber S is between 750mm and 1600mm in the height direction. The wind speed of the upper outer air supply port 22 is between 0.3m/s and 1.5 m/s. After such setting, the air current (air curtain or air curtain) that upper outer air supply mouth 22 provided to cut off passageway P1 does not influence the face wind speed, when preventing that the pollutant from passing through the bypass excessive, can also make the pollutant that gives off in the cabinet, and smoothly arrange outdoors, and can not dispel indoors through the operation mouth of fume chamber 1, endanger experimenter's health and safety.

The lower air supply module 30 is disposed at the bottom side of the inner cavity S and is in communication with the air supply system 40. Illustratively, the lower plenum 30 is spaced from the partition path P1 described above in the height direction. The lower air supply module 30 includes a lower air supply port 31, the lower air supply port 31 extends along the width direction, and the lower air supply port 31 is at least arranged towards the working chamber. Illustratively, the lower supply port 31 can supply air obliquely upward or horizontally or vertically downward toward the interior of the working chamber (shown as Q3 in fig. 5).

Referring to fig. 6, the source of air make-up in the working chamber of the present application includes: an upper outer air supply port 22, an upper inner air supply port 21, a lower air supply port 31, and a front opening 1a. Illustratively, the upper and lower air supply ports 21 and 31 have a 25% air supply rate, a 15% air supply rate, and a 50% air supply rate.

Since the upper inner air supply port 21, the upper outer air supply port 22, and the lower air supply port 31 extend in the lateral width direction of the working chamber, air can be uniformly supplied, and the formation of turbulence can be prevented. The risk of the inhalation of harmful substances by operators is reduced, the air blown out by each air supply port forms an air barrier, the effect of buffering the air in the working cavity and the environment outside the cabinet can be achieved, and the overflow risk is effectively prevented. Meanwhile, after the air supply ports are arranged, the air quantity fed from the front opening 1a can be reduced, so that the energy consumption of the air conditioner is reduced, and the stable push-pull air flow mode can be established in the working cavity due to the arrangement of the upper inner air supply port 21, so that the risk of air overflow in the working cavity is greatly reduced.

The structure of the upper air supplement module 20 will be described in detail.

In some possible embodiments, referring to fig. 7 to 9, the upper air supplement module 20 includes: and (5) an upper air supplementing box body. Illustratively, referring to FIG. 5, an upper plenum box is provided between the partition 13 and the top liner panel 101 of the interior cavity S, the partition 13 supporting the upper plenum box. However, the present application is not limited thereto, and the installation method of installing the upper air compensating box body on the top lining plate 101 of the inner chamber S to supply air to the working chamber and the partition passage P1 is within the scope of the present application. For example, the upper air supplementing box body is connected with the left lining plate and the right lining plate along the width direction.

The upper air supplementing box body is provided with an upper air supplementing cavity (for example, a first upper air supplementing cavity S1, a second upper air supplementing cavity S2 and a third upper air supplementing cavity S3 which are described later) and an upper air supplementing air inlet 2011 communicated with the upper air supplementing cavity, the upper air supplementing cavity is provided with a pore plate (comprising a flow guide plate 205 and an upper air supplementing air filtering plate 206 which are described later), external air enters the upper air supplementing cavity from the upper air supplementing air inlet 2011, and flows out of the upper air supplementing box body from an upper inner air supplementing opening 21 and an upper outer air supplementing opening 22 after passing through the pore plate. That is, the upper air supply module 20 of the present application is a box structure, the box has an upper air supply cavity, and after the external air enters the upper air supply cavity from the upper air supply inlet 2011, the external air enters the upper inner air supply port 21 and the upper outer air supply port 22 uniformly due to the steady flow effect of the orifice plate.

In the present application, fig. 7 and 8 show that the upper air supply chamber of the upper air supply chamber body is one and extends in the width direction. In some possible embodiments, the upper air supplementing cavities of the upper air supplementing box body can be multiple, such as two, three, four, etc.

As shown in fig. 7 and 9, the upper air compensating box and the orifice plate (including the guide plate 205 and the upper air compensating air filter plate 206 described later) extend in the width direction of the fume hood 1, respectively.

Referring to fig. 7 and 8, in the embodiment of the present application, the upper wind supplementing cavities include a first upper wind supplementing cavity S1, a second upper wind supplementing cavity S2, and a third upper wind supplementing cavity S3. That is, the upper wind supplementing wind cavity comprises three wind cavities. The upper air supplementing inlet 2011 is arranged in the first upper air supplementing cavity S1 and is communicated with the first upper air supplementing cavity S1; the upper inner air supplementing port 21 is arranged in the second upper air supplementing air cavity S2 and is communicated with the second upper air supplementing air cavity S2; the upper outer air supply port 22 is arranged in the third upper air supply cavity S3 and is communicated with the third upper air supply cavity S3. Along the height direction (shown in the Z direction in fig. 8), the second upper wind supplementing wind cavity S2 is located between the first upper wind supplementing wind cavity S1 and the third upper wind supplementing wind cavity S3, and the first upper wind supplementing wind cavity S1, the second upper wind supplementing wind cavity S2 and the third upper wind supplementing wind cavity S3 are communicated.

The orifice plate includes guide plate 205 and upper air compensating air filter 206, is equipped with a plurality of first air filter holes 20531 that distribute along the width direction on the guide plate 205, is equipped with a plurality of second air filter holes 2061 that distribute along the width direction on the upper air compensating air filter 206. In the height direction, the deflector 205 is located between the first upper supplemental air chamber S1 and the second upper supplemental air chamber S2; outside air enters the first upper air supplementing cavity S1 through the upper air supplementing air inlet 2011, and the upper air supplementing air filtering plate 206 is located between the second upper air supplementing cavity S2 and the third upper air supplementing cavity S3. That is, the baffle 205 and the upper supplemental air filter 206 divide the upper supplemental air chamber into a first upper supplemental air chamber S1, a second upper supplemental air chamber S2, and a third upper supplemental air chamber S3.

Outside air from the air supplementing system 40 enters the first upper air supplementing air cavity S1 from the upper air supplementing air inlet 2011, flows along the guide plate 205 and passes through the first air filtering holes 20531 on the guide plate 205 to reach the second upper air supplementing, and in the first upper air supplementing air cavity S1, the wind speed is reduced, dynamic pressure is converted into static pressure, and the pressure stabilizing effect is achieved. Under the action of static pressure, the air quantity uniformly passes through the air filtering holes on the guide plate 205, and the air from the air filtering holes on the guide plate 205 reaches uniform air speed in the width direction.

After the air volume reaches the second upper air supplementing air cavity S2, most of the air volume is discharged from the upper inner air outlet and enters the working cavity, and a small part of the air volume passes through the second air filtering holes 2061 on the upper air supplementing air filtering plate 206 and reaches the third upper air supplementing air cavity S3. That is, the air output of the second upper supplemental air chamber S2 is greater than the air output of the third upper supplemental air chamber S3. That is, the air volume of the upper air outlet is smaller than that of the upper inner air outlet. By this arrangement, the surface wind speed can be kept unaffected. Illustratively, the amount of air passing through the upper supplemental air filter 206 may be determined by the concentration of the arrangement of perforations on the upper supplemental air filter 206. In some possible embodiments, the open area of the upper inner air outlet is 1.5 to 4 times the open area of the upper outer air outlet.

The air quantity reaching the third upper air supplementing air cavity S3 is discharged from the upper air outlet and enters the partition channel P1.

In some possible embodiments, the upper supplemental air chamber is not limited to three air chambers, but may be a greater number of air chambers, for example four air chambers, or may be a lesser number of air chambers, for example two. In some possible embodiments, the upper supplemental air chamber includes a first upper supplemental air chamber S1 and a second upper supplemental air chamber S2, for example, by removing the upper supplemental air filter plate 206 in fig. 8, the original second air chamber and the third air chamber are combined into one air chamber. The upper inner air supplementing opening 21 and the upper outer air supplementing opening 22 are both arranged in the second upper air supplementing air cavity S2 and are respectively communicated with the second upper air supplementing air cavity S2.

Thus, the orifice plate includes a baffle 205, the baffle 205 being located between the first upper supplemental air chamber S1 and the second upper supplemental air chamber S2; the external air enters the first upper air supplementing cavity S1 through the upper air supplementing air inlet 2011, enters the second upper air supplementing cavity S2 after passing through the guide plate 205, and flows out of the upper air supplementing box body through the upper inner air supplementing opening 21 and the upper outer air supplementing opening 22 respectively.

The embodiment of the application is exemplified by three wind chambers.

In some possible embodiments, one or more of the first upper supplemental air chamber S1, the second upper supplemental air chamber S2, or the third upper supplemental air chamber S3 may be formed by a plurality of subchambers.

With continued reference to fig. 7 to 9, the upper air supplementing box of the present application includes a top plate 201, an arc plate 202, a connecting plate 204 and a bottom plate 203, the arc plate 202 is disposed facing the inner cavity S, the connecting plate 204 extends in the height direction and is disposed opposite to the inner cavity S, the upper inner air supplementing opening 21 is disposed on the arc plate 202, and the upper outer air supplementing opening 22 is disposed on the bottom plate 203; along the height direction, the upper air supplementing inlet 2011 is disposed on the top plate 201, and the second upper air supplementing air cavity S2 is located below the first upper air supplementing air cavity S1.

As shown in fig. 7 and 8, the baffle 205 extends in the width direction to be connected with the end plate 208 of the box body to enclose a first upper supplemental air chamber S1 with the top plate 201, the arc-shaped plate 202 and the connecting plate 204, the upper supplemental air filter 206 extends in the width direction to be connected with the end plate 208 of the box body to enclose a second upper supplemental air chamber S2 with the baffle 205, the arc-shaped plate 202, the bottom plate 203 and the connecting plate 204, and the upper supplemental air filter 206 extends in the width direction to be connected with the end plate 208 of the box body to enclose a third upper supplemental air chamber S3 with the extension passage 207.

In some possible embodiments, the deflector 205 includes a first inclined section 2053, where the first inclined section 2053 is inclined upward and connected to the connection plate 204, and the first inclined section 2053 is provided with a plurality of first air filtering holes 20531. The first air filtering holes 20531 of the air deflector 205 are formed in the first inclined section 2053, so that air can be prevented from blowing against the first air filtering holes 20531, and the air can be blown onto the connecting plate 204 after flowing out of the first air filtering holes 20531 on the first inclined section 2053, thereby achieving a steady flow effect.

The bottom plate 203 further has an extension channel 207 protruding downward, an inner cavity S of the extension channel 207 forms a third upper air-compensating air cavity S3, the third upper air-compensating air cavity S3 is communicated with the second upper air-compensating air cavity S2, and an upper air outlet is provided at an end of the extension channel 207. Illustratively, the extension channel 207 is located in the partition channel P1, so as to sufficiently clean and dilute contaminants inside the window 14, accelerate the top bypass air intake speed, prevent contaminants from overflowing through the bypass, eliminate the accumulation of inert flow inside the window 14, and further make the fume hood 1 compact.

Illustratively, the first inclined segment 2053 is disposed offset from the upper supplemental air inlet 2011 in a height direction, and the first inclined segment 2053 is disposed opposite the upper outer supplemental air inlet 22. That is, the upper supplemental air intake 2011 is not disposed opposite to the first inclined section 2053, so that the air is prevented from directly blowing the first air filtering holes 20531 on the first inclined section 2053, and the air output is uniform. Meanwhile, in the height direction, the plurality of first air filtering holes 20531 of the first inclined section 2053, the upper air compensating air filtering plate 206 and the upper air outlet are in one-to-one correspondence. Under the action of static pressure, the wind from the second wind filtering holes 2061 on the upper wind supplementing filter plate 206 has uniform wind speed in the width direction, and then the wind blown to the partition channel P1 from the upper wind outlet is uniform in wind speed, so that the surface wind speed is not influenced. And the air outlet of the upper air outlet can be regulated.

Illustratively, the upper supplemental air intake 2011 is disposed at an end of the top plate 201 proximate to the interior cavity S. For example, as shown in fig. 8, the upper supplemental air intake 2011 is disposed on the left side of the upper supplemental air box, and the first inclined section 2053 is disposed on the right side of the upper supplemental air box. After such arrangement, after the external air enters the first upper air-supplementing air cavity S1 from the upper air-supplementing air inlet 2011, the external air flows along the depth direction and flows to the first air-filtering holes 20531 on the first inclined section 2053, so that the flowing distance of the external air in the first upper air-supplementing air cavity S1 is prolonged, which is beneficial to the uniformity of the air outlet of the first air-filtering holes 20531.

Illustratively, the baffle 205 further includes a straight segment 2052, the straight segment 2052 being connected to an end of the first angled segment 2053 that is not connected to the connection plate 204, the straight segment 2052 and the first angled segment 2053 being disposed at an obtuse angle (the complement of α in fig. 8). Illustratively, the straight section 2052 of the baffle 205 is parallel to the top plate 201.

In some possible embodiments, the angle between the extension of the straight segment 2052 and the extension of the first angled segment 2053 is α,20 β.ltoreq.α.ltoreq.80 °. Within this parameter range, the air outlet of the first air filtering holes 20531 can be made uniform.

In some possible embodiments, referring to FIG. 8, the distance from the web 204 at the intersection of the extension of the straight segment 2052 and the extension of the first sloped segment 2053 (shown as O in FIG. 8) is W,30 mm.ltoreq.W.ltoreq.150 mm. By the arrangement, the air outlet of the first air filtering holes 20531 can be uniform.

In some possible embodiments, the baffle 205 further includes a second inclined section 2051, the second inclined section 2051 being connected to the arc plate 202 by being inclined upward, and two ends of the straight section 2052 being connected to the first inclined section 2053 and the second inclined section 2051, respectively. Illustratively, the upper supplemental air intake 2011 is located above the second sloped section 2051 in the height direction. After the arrangement, the external air enters the first upper air supplementing cavity S1 from the upper air supplementing air inlet 2011, and can fall along the inclined plane of the second inclined section 2051, so that the resistance loss is reduced, and the air is beneficial to flowing in the first inclined section 2053.

In some possible embodiments, the upper supplemental air filter 206 is connected to the connection plate 204 at one end and to the bottom plate 203 at the other end. The upper air compensating air filtering plate 206 is lapped on the bottom plate 203 and is perpendicular to the connecting plate 204, the extending channel 207 extends downwards from the connection parts of the upper air compensating air filtering plate 206 and the connecting plate 204 respectively with the upper air compensating air filtering plate 206, and one side wall (the right side wall of the extending channel 207 shown in fig. 8) of the extending channel 207 is in the same plane with the connecting plate 204. The left side wall of the extension channel 207 is shown in fig. 8 connected to the bottom plate 203 and extends downward. Illustratively, the extension channel 207 is inverted trapezoidal in shape. It is convenient to extend the extension passage 207 into the partition passage P1.

It should be noted that, the structure of the upper air compensating box body of the present application is not limited to the structure shown in fig. 8, and the structure having the upper air compensating inlet 2011, the upper air compensating cavity, the upper outer air compensating opening 22 and the upper inner air compensating opening 21 all fall within the protection scope of the present application.

Referring to fig. 7 and 9, the upper air supply inlet 2011 of the embodiment of the present application is an elongated slot, and the upper air supply inlet 2011 includes one or more than one. Two upper supplemental air intakes 2011 are shown in fig. 9. In some possible embodiments, the number of the upper air-supplementing air inlets 2011 may be more, so as to provide external air to the upper air-supplementing air cavity.

Referring to fig. 2 to 6 and 9, the air supply system 40 of the present application includes an air supply channel 41 disposed at the top of the cabinet 10, an air supply inlet 411 is disposed at the top of the air supply channel 41, an air supply outlet 412 (see fig. 10) is disposed at the bottom of the air supply channel 41, a first air passage 1012 is disposed on a top lining plate 101 of the inner cavity S, and the top lining plate 101 is disposed between the air supply channel 41 and the upper air supply box, and the air supply outlet 412, the first air passage 1012 and the upper air supply inlet 2011 are communicated. That is, the air supply enters the air supply channel 41 from the air supply inlet 411, flows through the air supply outlet 412 at the bottom of the air supply channel 41, the first air passage 1012 on the top lining board 101, the upper air supply inlet 2011, and enters the upper air supply cavity of the upper air supply module 20.

In some possible embodiments, referring to fig. 5 and 9, the fume hood 1 further includes a lifting block 1011, the lifting block 1011 being located between the air supply channel 41 and the top interior lining 101 in the height direction, the air supply channel 41 being spaced apart from the top interior lining 101 and forming a wire passing channel (through which a wire is passed); the lifting block 1011 is provided with a second air-passing channel 10111, and an air-supplementing air outlet, a first air-passing channel 1012, the second air-passing channel 10111 and an upper air-supplementing air inlet 2011 are communicated. The air supply enters the upper air supply module 20 from the air supply outlet 412 at the bottom of the air supply channel 41 through the heightening block 1011 and the top lining plate 101. The upper or lower surface of the elevating block 1011 contacts with the air supply channel 41 and the top lining plate 101, and the bonding surface is adhered with sealing foam.

Because the heightening block 1011 is arranged, the air supplementing channel 41 can not be in large-area contact with the top inner lining plate 101, and can not press the cable used by the fume hood 1, thereby being convenient for changing the corresponding cable when maintaining equipment.

Referring to fig. 9 and 10, the air supply outlet 412, the first air-passing channel 1012, the second air-passing channel 10111, and the upper air supply inlet 2011 are elongated slots, and the air supply outlet 412, the first air-passing channel 1012, the second air-passing channel 10111, and the upper air supply inlet 2011 include one or more than one and are in one-to-one correspondence. Fig. 9 and 10 show that the air supply outlet 412, the first air-passing channel 1012, the second air-passing channel 10111 and the upper air-supply inlet 2011 are respectively two, and in the height direction, each air supply outlet 412, the first air-passing channel 1012, the second air-passing channel 10111 and the upper air-supply inlet 2011 are in one-to-one correspondence, so that two independent air supply paths are formed rather, and do not interfere with each other.

Referring to fig. 2 to 6 and 9, the air supply system 40 of the present application further includes an air inlet channel 42 communicating with the air supply channel 41, the air inlet channel 42 extending in a height direction and being located at a rear side of the cabinet 10, and a working chamber being located between the air inlet channel 42 and the lower air supply port 31 in a depth direction of the cabinet 10; a regulating passage 43 extending in the depth direction of the cabinet 10, the regulating passage 43 having an inlet and an outlet in the depth direction, the inlet of the regulating passage 43 communicating with the outlet of the air intake passage 42; the upper air compensating module 20 comprises an air outlet channel, the air outlet channel is provided with a lower air compensating opening 31, and an inlet of the air outlet channel is connected with an outlet of the adjusting channel 43.

Illustratively, the external air from the air inlet channel 42 enters the adjusting channel 43, which is equivalent to the small space entering the large space, and after passing through the orifice plate in the adjusting channel 43, the external air reduces the influence of jet flow on the flow field, converts partial dynamic pressure into static pressure, reduces the speed of the external air, and finally the air outlet has uniform air speed, so that the lower air supply port 31 can supply air to the working cavity of the ventilation cabinet 1 uniformly, and the functions of stabilizing pressure and reducing noise are achieved.

Illustratively, the air intake passage 42 includes a first air intake passage 42 and a second air intake passage 42 disposed at intervals in the width direction, the two air intake passages 42 extending along the height, respectively.

Illustratively, the air compensating duct 41 includes a first portion 412, a second portion 413 and a third portion 414, which are sequentially communicated, the first portion 412 is communicated with one of the air inlet ducts 42, the air compensating inlet 411 is disposed in the second portion 413, and the third portion 414 is communicated with the other air inlet duct 42. Illustratively, the first and third portions 412, 414 of the supplemental air channel 41 each extend in a depth direction, and the second portion 412 of the extension channel 207 extends in a width direction.

In fluid mechanics: the fluid has the characteristic of viscosity, and the flow velocity of the fluid in the middle of the pipeline is the fastest in the flowing process of the pipeline, and the flow velocity of the fluid at the inner wall of the pipeline is the slowest. The reason is that: the fluid and the tube wall have friction with each other, known as viscous forces, which impede flow.

The capturing capacity is the weakest at the position where the flow velocity is the slowest on the left and right inner side walls of the through cabinet (i.e., the left and right inner liners 105 and 104). Often the point where the contaminant escapes.

For this purpose, referring to fig. 6 and 11, the fume hood 1 of the present application further comprises: the side air supplementing module comprises a side air outlet arranged towards the rear side of the inner cavity S, and the side air supplementing module is communicated with the air supplementing system 40. The side air make-up module blows air to the rear side (e.g., baffle 205 described below) facing the interior chamber S to accelerate flow, i.e., to accelerate the interior wall flow rate, eliminate inert flow or backflow, and enhance the interior wall contaminant capturing capacity. Therefore, the application adds the active air supply structure at the inner wall, thereby reducing the risk of pollutant leakage.

That is, referring to fig. 5 and 6, the source of supplemental air within the working chamber of the present application includes: an upper outer air supply port 22 (Q2), an upper inner air supply port 21 (Q2), a lower air supply port 31 (Q3), a front opening 1a (Q1) and a side air outlet port (Q4).

Illustratively, the lower and/or upper air make-up modules 30, 20 are in communication with the side air make-up modules to provide a make-up airflow to the air cavities of the side air make-up modules. That is, the lower air-supplementing module 30 described in the above embodiment supplies the air-supplementing air flow to the air chambers of the side air-supplementing module, or the upper air-supplementing module 20 described in the above embodiment supplies the air-supplementing air flow to the air chambers of the side air-supplementing module, or both the lower air-supplementing module 30 and the upper air-supplementing module 20 described in the above embodiment supplies the air-supplementing air flow to the air chambers of the side air-supplementing module.

The specific structure of the side air supply module is described in detail below.

Referring to fig. 1, 6 and 17, the fume hood 1 according to the embodiment of the present application further includes a left upright 11 and a right upright 12, and the lower air supplementing module 30 is located between the left upright 11 and the right upright 12 in the width direction of the fume hood 1. In the depth direction, the left pillar 11 is located on the front side of the left lining board 105, and the right pillar 12 is located on the front side of the right lining board 104. That is, the left lining plate 105 is mounted on the side of the left pillar 11 facing the rear side of the inner chamber S, and the right lining plate 104 is mounted on the side of the right pillar 12 facing the rear side of the inner chamber S.

Referring to fig. 11 to 13, the right pillar 12 includes a right pillar first air inlet 1211 and a right pillar air supply chamber extending in a height direction, a right pillar air outlet is provided at a portion of the right pillar 12 facing the inner chamber S, and the right pillar air supply chamber communicates with the air supply system 40 through the right pillar air outlet, and the right pillar air outlet communicates with the right pillar air supply chamber.

The side air supplementing module comprises a left upright post air supplementing cavity, a left upright post air outlet and a left upright post first air inlet.

Illustratively, the structure of the left upright 11 is identical to the structure of the right upright 12. The portion of the left upright 11 facing the inner cavity S is provided with a left upright air outlet, and the left upright air supplementing cavity is communicated with the air supplementing system 40 through the left upright air outlet, and the left upright air outlet is communicated with the left upright air supplementing cavity.

The side air supplementing module comprises a right upright post air supplementing cavity, a right upright post air outlet and a right upright post first air inlet 1211.

That is, in the embodiment of the present application, the side air supply modules are formed by the left pillar 11 and the right pillar 12, respectively. In some possible embodiments, the side air supplementing module may be formed by the left upright 11, or the side air supplementing modules may be formed by the right upright 12. In the embodiment of the application, the left upright 11 and the right upright 12 form a side air supplementing module at the same time.

Referring to fig. 13, the right column 12 further includes a right column side air compensating filter 1224 extending in the height direction, the right column side air compensating filter 1224 dividing the right column air compensating chamber into a right column front air compensating chamber 122 and a right column rear air compensating chamber 121, the right column air outlet communicating with the right column front air compensating chamber 122, the right column first air inlet 1211 communicating with the right column rear air compensating chamber 121.

Correspondingly, the left upright 11 further comprises a left upright side air supplementing air filtering plate extending along the height direction, the left upright side air supplementing air filtering plate divides the left upright air supplementing air cavity into a left upright front air supplementing air cavity and a left upright rear air supplementing air cavity, the left upright air outlet is communicated with the left upright front air supplementing air cavity, and the left upright first air inlet is communicated with the left upright rear air supplementing air cavity.

As shown in fig. 11 and 13, in the width direction, both sides of the lower air supply module 30 are provided with a left lower air supply outlet and a right lower air supply outlet 301; the left upright post first air inlet is arranged on one side of the left upright post 11 facing the downward air supplementing module 30, and the left lower air supplementing air outlet is communicated with the left upright post first air inlet; the right pillar first air inlet 1211 is disposed on a side of the right pillar 12 facing the downward air supply module 30, and the right lower air supply outlet 301 is communicated with the right pillar first air inlet 1211. That is, the air-make-up air flow is provided to the left post-air-make-up air chamber and the right post-air-make-up air chamber 121 by the lower air-make-up module 30.

Because the lower air supplementing module 30 supplements air from the rear side of the fume hood 1, the lower air supplementing module 30 can provide a part of air volume from the air supplementing system 40 to the left upright 11 and the right upright 12 to form side air supplementing, and other air supplementing systems 40 are not required to be additionally arranged, so that parts are saved, the structure is compact, and the existing air supplementing systems 40 are fully utilized for side air supplementing.

Also, fig. 11 shows that the air supply channel 41 supplies the external air to the air supply chamber 431 of the air supply channel 43 through the air supply inlet 411, and the air supplied from the air supply chamber 431 to the lower air supply module 30 is uniform, so that the air supply flows supplied from the lower air supply module 30 to the left post-air supply chamber and the right post-air supply chamber 121 are also uniform, and then the air outlets from the left post-air outlet and the right post-air outlet are also uniform. The flow speed of the inner wall surface is quickened, inert flow or backflow is eliminated, and the pollutant capturing capacity of the inner wall is enhanced. Thus, combining the lower air make-up module 30 with the side air make-up module formed by the left and right uprights 11, 12 creates a "1+1 > 2" effect.

With continued reference to fig. 13, the right upright 12 includes a first arm 1221, a second arm 1222, and a third arm 1223 that are disposed at intervals along a width direction (shown in an X direction in fig. 13), the first arm 1221 and the second arm 1222 of the right upright 12 clamp a right upright air outlet plate 1225, the right upright air outlet plate 1225 is provided with a plurality of right upright air outlets along a height direction, and the first arm 1221, the second arm 1222, the right upright air outlet plate 1225, and the right upright side air compensating filter 1224 of the right upright 12 enclose a right upright front air compensating cavity 122; the second arm 1222 and the third arm 1223 of the right pillar 12 clamp the left interior lining 105.

The left upright post 11 comprises a first arm, a second arm and a third arm, the first arm and the second arm of the left upright post 11 clamp a left upright post air outlet plate, the left upright post air outlet plate is provided with a plurality of left upright post air outlets along the height direction, and the first arm, the second arm, the left upright post air outlet plate and the left upright post side air supplementing filter plate of the left upright post 11 enclose a left upright post front air supplementing cavity; the second and third arms of the left upright 11 clamp the left interior lining 105.

By the arrangement, the structure of the fume chamber 1 is compact, the left column front air supplementing cavity and the right column front air supplementing cavity 122 are formed when the left column 11 and the right column 12 are used for clamping the lower air supplementing module 30, the left inner lining plate 105 and the right inner lining plate 104, and inward air supplementing along the left inner lining plate 105 and the right inner lining plate 104 is realized.

After the air enters the right column first air inlet 1211 from the right lower air supply outlet 301, the air reaches the right column rear air supply chamber 121. In the air supplementing cavity 121 behind the right upright post, the air speed is reduced, dynamic pressure is converted into static pressure, and the pressure stabilizing effect is achieved. Under the action of static pressure, the air quantity uniformly passes through the right upright post side air supplementing air filtering plate 1224, and the air coming out of the right upright post side air supplementing air filtering plate 1224 reaches uniform air speed in the width direction. The air supplementing filter plate 1224 enters the front air supplementing cavity 122 of the right upright post from the side of the right upright post, and is discharged from the air outlet hole plate 1225 of the right upright post. The right post outlet hole plate 1225 serves to prevent foreign matter from entering the wind chamber and further to even out the flow. The air quantity discharged from the right column air outlet hole plate 1225 plays a role in accelerating the flow velocity of the inner wall surface and eliminating the inert flow or reflux.

Similarly, the wind enters the first air inlet of the left upright post from the left lower wind supplementing air outlet and reaches the wind supplementing cavity of the left upright post. In the air supplementing cavity behind the left upright post, the wind speed is reduced, dynamic pressure is converted into static pressure, and the pressure stabilizing effect is achieved. Under the action of static pressure, the air quantity uniformly passes through the left column side air supplementing and filtering plate, and the air from the left column side air supplementing and filtering plate reaches uniform air speed in the width direction. The air supplementing filter plate on the left upright post side enters the air supplementing cavity in front of the left upright post and is discharged from the air outlet hole plate of the left upright post. The left upright post air outlet hole plate plays a role in preventing foreign matters from entering the air cavity and further homogenizing the flow. The air quantity discharged from the left upright post air outlet hole plate plays a role in accelerating the flow velocity of the inner wall surface and eliminating the inert flow or backflow.

In some possible embodiments, the volume of the left post front make-up air chamber is less than the volume of the left post rear make-up air chamber, and the volume of the right post front make-up air chamber 122 is less than the volume of the right post rear make-up air chamber 121. Illustratively, the volume of the left post rear supplemental air chamber is 1-8 times the volume of the left post front supplemental air chamber; the volume of the right post rear air-supplementing air cavity 121 is 1-8 times that of the right post rear air-supplementing air cavity 121. After the arrangement, the flow stabilizing effect can be achieved, so that the air outlet of the left upright post 11 and the air outlet of the right upright post 12 are uniform.

Fig. 11 and 13 illustrate the supply of make-up air to the air chambers of left and right columns 11 and 12 by lower make-up air module 30 as described in the above embodiments.

In other embodiments, referring to fig. 14-16, the upper supplemental air module 20 described by way of example above provides supplemental air flow to the air chambers of the side supplemental air modules. The left upright 11 further comprises a left upright second air inlet, and the left upright second air inlet is located above the left upright first air inlet. The right column 12 also includes a right column second air inlet 1212, the right column second air inlet 1212 being located above the right column first air inlet 1211.

Referring to fig. 14, in the width direction, upper left and right air-supply outlets 2012 and 2012 are provided on both sides of the upper air-supply module 20; the left upright post second air inlet is arranged on one side of the left upright post 11 facing the air supplementing module 20, and the left upper air supplementing air outlet 2012 is communicated with the left upright post second air inlet; the right column second air inlet 1212 is disposed on a side of the right column 12 facing the air make-up module 20, and the upper right air make-up air outlet is communicated with the right column second air inlet 1212. That is, the air-make-up air flow is provided through the upper air-make-up module 20 to the left post-make-up air chamber and the right post-make-up air chamber 121.

Because the upper air supplementing module 20 is an air supplementing channel 41 for supplementing air, the upper air supplementing module 20 can provide a part of air volume from the air supplementing channel 41 for the left upright 11 and the right upright 12 to form side air supplementing, and other air supplementing systems 40 are not required to be additionally arranged, so that parts are saved, the structure is compact, and the existing air supplementing systems 40 are fully utilized for side air supplementing.

Also, fig. 8 shows that the air supply channel 41 supplies external air to the upper air supply module 20 through the air supply inlet 411, and the supplied air is uniform, so that the air supply flows supplied from the upper air supply module 20 to the left post-air supply chamber and the right post-air supply chamber 121 are also uniform, and then the air outlets of the left post-air outlet and the right post-air outlet are also uniform. The flow speed of the inner wall surface is quickened, inert flow or backflow is eliminated, and the pollutant capturing capacity of the inner wall is enhanced. Thus, combining the upper air make-up module 20 with the side air make-up module formed by the left and right uprights 11, 12 creates a "1+1 > 2" effect.

In some possible embodiments, referring to fig. 2 to 5 and 17, the fume hood 1 of the present application further includes a lower stage baffle 52, a middle stage baffle 53 and an upper stage baffle 54 disposed in a height direction, and the lower stage baffle 52, the middle stage baffle 53 and the upper stage baffle 54 are disposed at intervals from a rear interior lining 103 of the inner chamber S to form an exhaust passage P2, and the exhaust passage P2 communicates with an exhaust outlet 51 of the exhaust system 50. Fig. 2 and 3 show that the exhaust duct P2 extends in the height direction as a whole.

The lower-stage baffle plate 52 and the middle-stage baffle plate 53 are provided with a plurality of through holes.

Illustratively, a plurality of lower-stage through holes 521 are provided in a large area on the panel of the lower-stage baffle plate 52, and the plurality of lower-stage through holes 521 are distributed in the left-right width direction of the lower-stage baffle plate 52, so that heavy pollutants can be discharged out of the fume hood 1. Illustratively, the upper part of the table top is within 500mm in the height direction, which is the main position of a pollutant generating source, the lower guide plate 52 is added with a long groove feature (a lower penetrating hole 521), the wind speed of the groove is increased, and pollutant discharge is accelerated.

The middle part of the panel of the middle guide plate 53 is provided with a plurality of middle through holes 531 near the lower part, and the plurality of middle through holes 531 are distributed in the left-right width direction of the middle guide plate 53, so that pollutants in the middle part can be discharged out of the fume hood 1. In the width direction, the middle position is the main position of the pollution source, the middle guide plate 53 is slotted (the middle through hole 531) to increase the wind speed and accelerate the discharge. And the corner positions of the edges reduce the air discharge quantity and have no holes.

Illustratively, no through holes are provided in the upper baffle 54.

By adopting the structure, the average surface wind speed can be reduced, thereby reducing the overall exhaust air quantity requirement. In addition, the gas in the working chamber is advantageously guided to the exhaust area to avoid generation of air vortex, and the through holes in the baffle plate 205 are distributed in the entire left-right width direction of the baffle plate 205, so that continuous exhaust of the wide surface of the entire working chamber is advantageously provided.

Referring to fig. 2 to 5, in the embodiment of the present application, the upper stage baffle 54 includes an extension stage 542, the extension stage 542 is located between the rear interior lining 103 and the middle stage baffle 53, and the projection of the extension stage 542 overlaps with the projection of the middle stage baffle 53 in the depth direction of the fume hood 1; the extending section 542 is spaced apart from the middle guide plate 53 in the depth direction to form a revolving passage P3, and the revolving passage P3 extends in the height direction and communicates with the exhaust passage P2.

The conventional design of the baffle 205 generally sets the upper baffle 54 and the middle baffle 53 at intervals in the height direction to form an exhaust gap, or directly connects them fixedly without forming an exhaust gap. While the air flow in the working chamber rises so that a large vortex is formed in the upper part of the inner side.

Referring to fig. 5 and 18, in the embodiment of the present application, the long and narrow channel (the turning channel P3) between the upper guide plate 54 and the middle guide plate 53 is designed, and the rising air flow is extracted in the opposite direction (downward movement) and then discharged. Rather than a conventional design, causes the airflow to rise, thereby creating a large vortex. That is, the rising air flow enters the slit passage (turning passage P3), and H in fig. 5 shows the direction in which the air flow enters the turning passage P3; the air flow enters the long and narrow channel, then flows downwards, enters the exhaust channel P2, then ascends into the channel between the upper-stage deflector 54 and the rear lining plate 103, and is exhausted through the exhaust outlet 51 of the exhaust channel P2.

In some possible embodiments, the depth of the swivel channel P3 is 20mm to 1m in the height direction. The inner cavity S airflow structure can be improved, so that the airflow structure forms a stable laminar flow fluid form, and pollutants can be rapidly discharged.

The present application is not limited to the specific shape of the turning channel P3, and the structure capable of forming a channel extracted in the reverse direction (downward movement) using the ascending air flow falls within the scope of the present application.

In some possible embodiments, the extending section 542 is at an angle of-20 ° to the vertical in the height direction, and the mid-section baffle 53 is at an angle of-20 ° to the vertical in the height direction. That is, the range in which the extending section 542 is inclined 20 ° to the left or 20 ° to the right is the arrangement position of the extending section 542, and the range in which the middle stage baffle 53 is inclined 20 ° to the left or 20 ° to the right is the arrangement position of the middle stage baffle 53.

Fig. 5 shows that the extension 542 and the middle baffle 53 are arranged in parallel. At this time, the angle between the extending section 542 and the vertical line in the height direction is 0 °, and the angle between the middle stage baffle 53 and the vertical line in the height direction is 0 °.

Illustratively, the width of the swivel channel P3 is between 10mm and 80mm. By the arrangement, the airflow structure of the inner cavity S can be improved, so that the airflow structure forms a stable laminar flow fluid form, and pollutants can be rapidly discharged.

In some possible embodiments, referring to fig. 4 and 5, the rear lining panel 103 is provided with first, second and third connection members 15, 16, 17 at intervals in the height direction. Illustratively, the first, second, and third connectors 15, 16, 17 each extend in the depth direction.

The lower guide plate 52 is vertically arranged along the height direction, one end of the lower guide plate 52 is connected with the first connecting piece 15 and is arranged at intervals with the bottom side of the inner cavity S to form a first exhaust gap communicated with the exhaust channel P2, and the other end of the lower guide plate 52 is connected with the second connecting piece 16; along the height direction, the middle section guide plate 53 is vertically arranged, one end of the middle section guide plate 53 is connected with the second connecting piece 16, a second exhaust gap communicated with the exhaust channel P2 is formed between the middle section guide plate and the lower section guide plate 52, and the other end of the lower section guide plate 52 is connected with the third connecting piece 17; the upper-stage baffle 54 further includes an inclined section 541 in the height direction, one end of the extending section 542 is connected to the third connecting member 17, the other end of the extending section 542 is connected to one end of the inclined section 541, and the other end of the inclined section 541 is inclined toward the front side of the inner chamber S and is connected to the top lining plate 101 of the inner chamber S.

In some possible embodiments, the other end of the inclined section 541 forms a third exhaust gap with the top liner panel 101 of the interior cavity S that communicates with the exhaust passage P2. The top gas flow may be vented from this gap and Q6 in fig. 5 and 18 shows the gas flow entering this gap.

With continued reference to fig. 17, the lower-stage baffle plate 52 is provided with a lower exhaust area, and the lower exhaust area includes a plurality of lower-stage through holes 521; the middle air exhaust area is arranged on the middle air guide plate 53 and comprises a plurality of middle through holes 531.

The main reason for the leakage of the fume hood 1 is that no good air flow structure is formed inside and outside the fume hood 1.

For this purpose, with reference to fig. 18, in another embodiment of the application, the working chamber of the fume hood 1 is divided into three air flow organization areas from bottom to top in the height direction: A. b, C. Wherein, in FIG. 18, a gas flow organization area A is formed below a broken line M-M, and a gas flow organization area B is formed between the broken line M-M and the broken line L-L; the air flow organization area C is formed above the dashed line L-L in FIG. 18.

In the airflow organization area a: at least 80% of the make-up air from the lower make-up air module 30 enters the exhaust channel P2 from the lower exhaust area and the first exhaust gap between the lower baffle 52 and the bottom side of the interior chamber S.

In the airflow tissue region B: at least 80% of the outdoor supplemental air quantity from the front opening 1a enters the exhaust passage P2 from the intermediate exhaust area and the second exhaust gap between the middle stage baffle 53 and the lower stage baffle 52.

In the airflow texture region C: at least 80% of the make-up air from the upper make-up air module 20 enters the exhaust channel P2 from the return channel P3.

Equivalently, the air supply port of the lower air supply module 30 mainly corresponds to the lower air exhaust area on the lower section guide plate 52, and the air supply port of the air supply module mainly enters the lower air exhaust area of the lower section guide plate 52. The front opening 1a mainly corresponds to a middle exhaust area on the middle section guide plate 53, and the air supplementing quantity of the front opening 1a mainly enters the middle exhaust area of the middle section guide plate 53. The upper air compensating module 20 mainly corresponds to the rotary channel P3, and the air compensating quantity of the upper air compensating module 20 mainly enters the rotary channel P3.

After the arrangement is as follows: 1) The air supply reduces the air quantity extracted from the window opening (front opening) so as to achieve the purpose of energy conservation; 2) The arrangement of the air supply ports prevents pollutants from overflowing from the window openings, and the air supply ports are arranged on the upper side and the lower side of the fume hood 1 to prevent the pollutants from escaping from the fume hood; 3) Aiming at a plurality of air supply openings and window openings, the guide plate structure of the embodiment of the application is used to ensure that each air supply opening corresponds to an air suction opening on the guide plate; 4) Finally, the stability of the airflow structure is ensured, and a laminar flow state is achieved without turbulent flow and turbulent flow, so that pollutants can be rapidly discharged.

The air exhaust proportion of each guide plate in the aspect of height, the width and the depth of the rotary channel P3 can be adjusted, and the air flow organization can be achieved through CFD simulation, so that the air flow organization of the inner cavity S is improved, and the air flow organization forms a stable laminar flow fluid form.

In some possible embodiments, at least 90% of the make-up air volume from the upper inner make-up air port 21 enters the exhaust channel P2 from the third exhaust gap between the swivel channel P3 and the other end of the inclined section 541 and the top liner panel 101 of the inner cavity S; at least 80% of the supply air quantity from the upper outer supply air port 22 enters the exhaust air passage P2 from the turning passage P3, and the rest enters the exhaust air passage P2 from the middle exhaust air area. By this arrangement, the airflow structure of the inner cavity S is further improved, and leakage of pollutants of the fume hood 1 is prevented.

In some possible embodiments, with continued reference to fig. 17, a lower exhaust port 55 is provided between the two sides 522 of the other end of the lower baffle 52 and the left and right interior liners 105, 104 of the inner chamber S, and a middle exhaust port 56 is provided between the two sides 532 of the one end of the middle baffle 53 and the left and right interior liners 105, 104 of the inner chamber S; along the depth direction of the fume hood 1, the projection of the lower air outlet 55 and the projection of the middle air outlet 56 are symmetrical along the adjacent lines (indicated by a broken line L in fig. 17) of the lower-stage baffle 52 and the middle-stage baffle 53.

Illustratively, along the width direction of the fume hood 1, first gaps are respectively formed between two side edges 522 of the other end of the lower-stage flow guide plate 52 and the left and right inner lining plates 105 and 104 of the inner cavity S, and the first gaps gradually increase from bottom to top, that is, the shape of the lower air outlet 55 gradually increases from bottom to top. Along the width direction of the fume chamber 1, second gaps are respectively formed between the two side edges 532 of one end of the middle section flow guide plate 53 and the left inner lining plate 105 and the right inner lining plate 104 of the inner cavity S, and the second gaps gradually decrease from bottom to top, that is, the shape of the middle air outlet 56 gradually decreases from bottom to top.

In some possible embodiments, at least 70% of the make-up air from the side make-up air module enters the exhaust channel P2 from the exhaust gaps between the lower and middle section baffles 52, 53 and the left and right liners of the interior chamber S, and the remainder enters the exhaust channel P2 from the lower and middle exhaust vents 55, 56.

After the arrangement is as follows: 1) The air supply reduces the air quantity extracted from the window opening (front opening) so as to achieve the purpose of energy conservation; 2) The arrangement of the air supply ports prevents pollutants from overflowing from the window openings, and the air supply ports are arranged on the upper side, the lower side, the left side and the right side of the fume hood 1, so that the pollutants are prevented from coming out in all aspects; 3) Aiming at a plurality of air supply openings and window openings, the guide plate structure of the embodiment of the application is used to ensure that each air supply opening corresponds to an air suction opening on the guide plate; 4) Finally, the stability of the airflow structure is ensured, and a laminar flow state is achieved without turbulent flow and turbulent flow, so that pollutants can be rapidly discharged.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the invention with reference to specific embodiments, and it is not intended to limit the practice of the invention to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present invention.

Claims

1. A fume hood, comprising:

the cabinet body is provided with an inner cavity, the inner cavity forms a working cavity, and a front opening which is opened to the indoor environment is formed at the front side of the inner cavity;

the air supplementing system is used for supplementing air to the fume hood;

the upper air supplementing module is arranged on the top side of the inner cavity and communicated with the air supplementing system, the upper air supplementing module comprises an upper inner air supplementing opening and an upper outer air supplementing opening, the upper inner air supplementing opening is arranged towards the working cavity, the upper outer air supplementing opening is arranged towards a partition channel on the top side of the inner cavity, and the upper outer air supplementing opening is not used for supplementing air from outside the window;

the lower air supplementing module is arranged at the bottom side of the inner cavity and communicated with the air supplementing system, and comprises a lower air supplementing port which is arranged at least towards the working cavity;

The air exhaust device comprises an inner cavity, and is characterized by further comprising a lower section guide plate, a middle section guide plate and an upper section guide plate which are arranged along the height direction, wherein the lower section guide plate, the middle section guide plate and the upper section guide plate are arranged at intervals with the rear inner lining plate of the inner cavity so as to form an air exhaust channel, and the air exhaust channel is communicated with an air exhaust system;

a lower exhaust area is arranged on the lower section guide plate, and a middle exhaust area is arranged on the middle section guide plate;

the upper section guide plate comprises an extension section, the extension section and the middle section guide plate are arranged at intervals along the depth direction to form a rotary channel, and the rotary channel extends along the height direction and is communicated with the exhaust channel;

at least 80% of the make-up air volume from the lower make-up air module enters the exhaust channel from the lower exhaust area and a first exhaust gap between the lower baffle and the bottom side of the inner cavity;

at least 80% of the outdoor air supply quantity from the front opening enters the air exhaust channel from the second air exhaust gap between the middle air exhaust area and the middle section guide plate and the lower section guide plate;

at least 80% of the make-up air volume from the upper make-up air module enters the exhaust channel from the swivel channel.

2. The fume hood of claim 1, further comprising: the partition piece is arranged at the front opening and is positioned at the top side of the inner cavity, and the partition piece and the bottom side of the inner cavity are arranged at intervals along the height direction of the cabinet body; the window is arranged at the outer side of the partition piece, can move upwards or downwards along the height direction, is arranged at intervals with the partition piece along the depth direction of the cabinet body, and forms a partition channel, and the partition channel is communicated with the inner cavity; the upper inner air supplementing opening is arranged towards the working cavity, and the upper outer air supplementing opening is arranged towards the partition channel.

3. The fume hood of claim 2, wherein the upper air make-up module comprises: the upper air supplementing box body is provided with an upper air supplementing cavity and an air inlet communicated with the upper air supplementing cavity, the upper air supplementing cavity is provided with a pore plate, external air enters the upper air supplementing cavity from the air inlet, and flows out of the upper air supplementing box body from the upper inner air supplementing opening and the upper outer air supplementing opening respectively after passing through the pore plate.

4. A fume hood according to claim 3 wherein said upper supplemental air cavities include a first upper supplemental air cavity and a second upper supplemental air cavity, said air inlet being in communication with said first upper supplemental air cavity, said upper inner and outer air inlets being in communication with said second upper supplemental air cavity, respectively; the orifice plate comprises a guide plate, and the guide plate is positioned between the first upper air supplementing cavity and the second upper air supplementing cavity; external air enters the first upper air supplementing air cavity from the air inlet, enters the second upper air supplementing air cavity after passing through the guide plate, and flows out of the upper air supplementing box body from the upper inner air supplementing opening and the upper outer air supplementing opening respectively.

5. The fume hood of claim 4, wherein the housing includes a top plate, an arcuate plate, a connecting plate, and a bottom plate, the arcuate plate disposed facing the interior cavity, the connecting plate extending in a height direction and disposed away from the interior cavity, the upper inner supply port being disposed in the arcuate plate, the upper outer supply port being disposed in the bottom plate;

6. The fume hood of claim 5, wherein the first angled section is offset from the air inlet along the height direction, and wherein the first angled section is disposed opposite the upper outer supply port.

7. The fume hood of any one of claims 4 to 6, further comprising a third upper supplemental air chamber in communication with the second upper supplemental air chamber, the orifice plate further comprising an upper supplemental air filter plate positioned between the second upper supplemental air chamber and the third upper supplemental air chamber.

8. The fume hood of claim 7, wherein the bottom plate further comprises an extension channel protruding downward, an inner cavity of the extension channel forms a third upper air-supplementing air cavity, the third upper air-supplementing air cavity is communicated with the second upper air-supplementing air cavity, and an upper air outlet is formed at an end of the extension channel.

9. The fume hood of claim 7, wherein an air output of the second upper supplemental air chamber is greater than an air output of the third upper supplemental air chamber.

10. A fume hood according to claim 3 wherein said upper plenum box is disposed between said partition and a top liner of said interior cavity, said partition supporting said upper plenum box.

11. A fume hood according to any one of claims 3 to 6 and 8 to 10 wherein said air supply system comprises an air supply duct provided at the top of said hood body, an air outlet being provided at the bottom of said air supply duct, a top liner of said interior cavity being provided with a first air supply duct, said top liner being located between said air supply duct and said upper air supply duct, said air outlet, said first air supply duct and said air inlet being in communication.

12. The fume hood of claim 11, further comprising a raised block located between the air make-up channel and the top interior lining panel in the height direction, the air make-up channel being spaced from the top interior lining panel and forming a through-line channel; the elevating block is provided with a second air passage, and the air outlet, the first air passage, the second air passage and the air inlet are communicated.

13. A fume hood according to any one of claims 1 to 6, 8 to 10, 12, further comprising: the side air supplementing module comprises a side air outlet which is arranged towards the rear side of the inner cavity, and the side air supplementing module is communicated with the air supplementing system.

14. A fume hood according to claim 13 wherein said lower and/or upper air make-up modules are in communication with said side air make-up modules to provide a make-up air flow to the air cavities of said side air make-up modules.

15. The fume hood of claim 14, further comprising a left upright and a right upright, wherein the lower air make-up module is located between the left upright and the right upright along a width direction of the fume hood;

16. The fume hood of claim 15, wherein the left column further comprises a left column side air-make-up air filter extending in the height direction, the left column side air-make-up air filter separating the left column air-make-up cavity into a left column front air-make-up cavity and a left column rear air-make-up cavity, the left column air outlet in communication with the left column front air-make-up cavity, the left column first air inlet in communication with the left column rear air-make-up cavity; and/or the number of the groups of groups,

17. A fume hood according to any one of claims 1 to 6, 8 to 10, 12, 14 to 16 wherein said extension section and said mid-section baffle are disposed in parallel.

18. A fume hood according to any one of claims 1 to 6, 8 to 10, 12, 14 to 16 wherein the depth of said swivel channel is 20mm to 1m in said height direction.

19. The fume hood of any one of claims 1 to 6, 8 to 10, 12, 14 to 16, wherein a lower exhaust port is provided between both sides of the other end of the lower stage baffle and the left and right interior panels of the interior chamber, and a middle exhaust port is provided between both sides of the one end of the middle stage baffle and the left and right interior panels of the interior chamber; along the depth direction of fume chamber, the projection of lower air exit with the projection of well air exit is followed the hypomere guide plate with the adjacent wiring symmetry of middle section guide plate.

20. The fume hood of claim 19, wherein, along a width direction of the fume hood, first gaps are respectively formed between both side edges of the other end of the lower-stage baffle and left and right interior liners of the inner cavity, and the first gaps gradually increase from bottom to top;

21. A fume hood according to any one of claims 1 to 6, 8 to 10, 12, 14 to 16, 20 wherein said air make-up system comprises: