A ventilation device

Abstract

The present invention relates to a ventilation device, comprising: a cabinet having an inner cavity, the inner cavity constituting a working cavity; a window provided on the front wall of the cabinet, the window being able to be opened along the height direction of the cabinet to form a front opening open to the indoor environment; a handle provided on the side of the window facing away from the inner cavity, a ventilation gap being provided between the handle and the window, the ventilation gap having a first opening and a second opening along the height direction, the first opening being provided toward the working cavity, the cross-sectional area of ​​the first opening being smaller than the cross-sectional area of ​​the second opening; and a lower air supply port provided below the cabinet, the lower air supply port being provided toward the inner cavity. The ventilation device of the present invention can effectively prevent internal pollutants from overflowing due to turbulence.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation, and in particular to ventilation equipment. Background Art

[0002] Ventilation equipment can generally be described as equipment that exhausts waste gas, harmful gas, particulate matter and other gases in a work space to the outside of the work space (usually outdoors). This type of equipment is widely used in industry and life. For example, factories that produce toxic, harmful or particulate gases in industrial production, biological and chemical laboratories in research and development institutions, kitchens that produce fumes when cooking, etc., all require ventilation equipment to isolate the toxic gases and particulate matter in a certain work space from the users, prevent the users from inhaling toxic and harmful gases and particulate matter, and discharge the toxic and harmful gases and particulate matter to the outdoors.

[0003] Most traditional ventilation equipment is equipped with a cabinet to provide a working chamber (working space), and a large amount of indoor ambient air is sent into the working chamber from the front opening of the cabinet, and a high-power fan is used to exhaust air from the working chamber to contain and treat harmful substances in the air. Unpredictable and inconsistent air flow patterns, such as vortex-type air organizations near the front opening, often occur. If there is turbulence and vortex in the air system in the working chamber of the ventilation equipment, there will be a risk of air overflow. When pollutants in the working chamber overflow into the breathing area due to turbulence, the health and safety of indoor workers will be threatened. Summary of the invention

[0004] In order to solve the above problems, the object of the present invention is to provide a ventilation device, comprising: a cabinet having an inner cavity, wherein the inner cavity constitutes a working cavity;

[0005] A viewing window is provided on the front wall of the cabinet, and the viewing window can be opened along the height direction of the cabinet to form a front opening open to the indoor environment;

[0006] A handle is provided on a side of the window facing away from the inner cavity, a ventilation gap is provided between the handle and the window, and along the height direction, the ventilation gap has a first opening and a second opening, the first opening is provided toward the working cavity, and a cross-sectional area of ​​the first opening is smaller than a cross-sectional area of ​​the second opening;

[0007] A lower air supply port is arranged below the cabinet body, and the lower air supply port is arranged toward the inner cavity to supply air into the working cavity.

[0008] Optionally, it also includes: an upper air supply port, which is arranged above the cabinet and located on the side of the window facing away from the inner cavity, and the upper air supply port is arranged toward the second opening to supply air into the working cavity through the ventilation gap.

[0009] Optionally, along the width direction of the cabinet, two ends of the ventilation gap have a third opening and a fourth opening respectively.

[0010] Optionally, the first opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively, and the second opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively.

[0011] Optionally, a cross-sectional area of ​​the ventilation gap gradually decreases in a direction from the second opening to the first opening.

[0012] Optionally, the portion of the handle facing the window is a concave arc surface.

[0013] Optionally, a base is further included, and the bottom of the window is provided with the base, and the part of the base facing the handle is flat.

[0014] Optionally, a base is further included, and the base is provided at the bottom of the window. The portion of the base facing the handle is a flat surface and an outwardly convex arc surface, and the outwardly convex arc surface protrudes toward the handle and is located below the base.

[0015] Optionally, the convex curved surface is closer to the working cavity than the plane.

[0016] Optionally, a base is further included, the base is provided at the bottom of the window, the portion of the handle facing the base is flat, and / or the portion of the base facing the handle is flat.

[0017] Optionally, a base is further included, the bottom of the window is provided with the base, the portion of the handle facing the base is a first plane and a second plane set at an angle, and / or the portion of the base facing the handle is a third plane and a fourth plane set at an angle.

[0018] Optionally, the handle and the window are spaced apart and connected via at least one connecting component, and the connecting component is located in the ventilation gap.

[0019] Optionally, the portion of the handle facing away from the window is an outwardly convex curved surface.

[0020] Optionally, the lower air outlet extends along the width direction of the cabinet, the ventilation gap extends along the width direction of the cabinet, the size of the lower air outlet in the width direction is greater than or equal to the size of the ventilation gap in the width direction, and the size of the ventilation gap in the width direction is greater than or equal to the size of the window in the width direction.

[0021] Optionally, the upper air outlet extends along the width direction of the cabinet, the ventilation gap extends along the width direction of the cabinet, the size of the upper air outlet in the width direction is greater than or equal to the size of the ventilation gap in the width direction, and the size of the ventilation gap in the width direction is greater than or equal to the size of the window in the width direction.

[0022] Optionally, the projection of the window along the height direction is completely located within the area where the lower air outlet is located.

[0023] Optionally, the lower air supply outlet includes a first part and a second part that are connected, the opening of the first part faces the window, and the opening of the second part faces the rear wall of the cabinet.

[0024] Optionally, the surface of the first part is a plane, and the surface of the second part is a plane or a convex curved surface.

[0025] The present invention also provides a ventilation device, comprising: a cabinet having an inner cavity, wherein the inner cavity constitutes a working cavity;

[0026] A viewing window is provided on the front wall of the cabinet, and the viewing window can be opened along the height direction of the cabinet to form a front opening open to the indoor environment;

[0027] A handle is provided on a side of the window facing away from the inner cavity, a ventilation gap is provided between the handle and the window, and along the height direction, the ventilation gap has a first opening and a second opening, the first opening is provided toward the working cavity, and a cross-sectional area of ​​the first opening is smaller than a cross-sectional area of ​​the second opening;

[0028] An upper air supply port is arranged above the cabinet and located on a side of the window facing away from the inner cavity. The upper air supply port is arranged toward the second opening to supply air into the working cavity through the ventilation gap.

[0029] Optionally, along the width direction of the cabinet, two ends of the ventilation gap have a third opening and a fourth opening respectively.

[0030] Optionally, the first opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively, and the second opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively.

[0031] Optionally, a cross-sectional area of ​​the ventilation gap gradually decreases in a direction from the second opening to the first opening.

[0032] Optionally, the portion of the handle facing the window is a concave arc surface.

[0033] Optionally, a base is further included, and the bottom of the window is provided with the base, and the part of the base facing the handle is flat.

[0034] Optionally, a base is further included, and the base is provided at the bottom of the window. The portion of the base facing the handle is a flat surface and an outwardly convex arc surface, and the outwardly convex arc surface protrudes toward the handle and is located below the base.

[0035] Optionally, the convex curved surface is closer to the working cavity than the plane.

[0036] Optionally, a base is further included, the base is provided at the bottom of the window, the portion of the handle facing the base is flat, and / or the portion of the base facing the handle is flat.

[0037] Optionally, a base is further included, the bottom of the window is provided with the base, the portion of the handle facing the base is a first plane and a second plane set at an angle, and / or the portion of the base facing the handle is a third plane and a fourth plane set at an angle.

[0038] Optionally, the handle and the window are spaced apart and connected via at least one connecting component, and the connecting component is located in the ventilation gap.

[0039] Optionally, the portion of the handle facing away from the window is an outwardly convex curved surface.

[0040] Optionally, the upper air outlet extends along the width direction of the cabinet, the ventilation gap extends along the width direction of the cabinet, the size of the upper air outlet in the width direction is greater than or equal to the size of the ventilation gap in the width direction, and the size of the ventilation gap in the width direction is greater than or equal to the size of the window in the width direction.

[0041] As described above, the present invention provides a ventilation device, which has a cabinet and a window, wherein the cabinet has an inner cavity, and the inner cavity of the cabinet constitutes a working cavity of the ventilation device; the window is arranged on the front wall of the cabinet, and the window can be opened along the height direction of the cabinet to form a front opening open to the indoor environment. A handle is arranged on the side of the window facing away from the inner cavity of the cabinet, and a ventilation gap is arranged between the handle and the window. Along the height direction, the ventilation gap has a first opening and a second opening, and the first opening is arranged toward the working cavity, and the cross-sectional area of ​​the first opening is smaller than the cross-sectional area of ​​the second opening. In addition, a lower air supply port is arranged below the cabinet, and the lower air supply port is arranged toward the inner cavity to supply air into the working cavity.

[0042] The air supply from the lower air supply port is combined with the wind flowing through the ventilation gap to form a side "eight"-shaped air flow effect, realizing the ventilation Venturi effect, so that the middle wind speed is sandwiched in the middle and the flow rate is faster, which speeds up the air flow rate from the front opening toward the working chamber, and can better control leakage and improve the isolation of ventilation equipment and operators.

[0043] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a three-dimensional diagram of a ventilation device according to an embodiment of the present invention;

[0045] Figure 2 is a side view of a ventilation device according to an embodiment of the present invention Figure 1 ;

[0046] Figure 3 The position relationship between the handle and the window of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0047] Figure 4 is a top view of a handle and a window according to an embodiment of the present invention;

[0048] Figure 5 The positional relationship between the handle and the base of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0049] Figure 6 The position relationship between the handle and the base of the embodiment of the present invention is shown in FIG. Figure 3 ;

[0050] Figure 7 The position relationship between the handle and the base of the embodiment of the present invention is shown in FIG. Figure 4 ;

[0051] Figure 8 is a side view of a ventilation device according to an embodiment of the present invention Figure 2 ;

[0052] Fig. 9 Schematic diagram of the positional relationship of the handle, upper air outlet and window in an embodiment of the present invention;

[0053] Fig.10 Side view of ventilation device according to an embodiment of the present invention Figure 3 ;

[0054] Fig.11 is the velocity streamline of the ventilation device according to the embodiment of the present invention Figure 1 ;

[0055] Fig.12 is the velocity streamline of the ventilation device according to the embodiment of the present invention Figure 2 ;

[0056] Fig.13 is the velocity streamline of the ventilation device according to the embodiment of the present invention Figure 3 . DETAILED DESCRIPTION

[0057] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description.

[0058] The fume hood is an important equipment for controlling pollutants in the laboratory. Its function is to control the pollutants emitted from the cabinet and discharge them to the outside smoothly, without escaping into the room through the operating port of the fume hood, endangering the health and safety of the experimenters. There are two basic elements for evaluating the performance of the fume hood, the surface wind speed and the pollutant control concentration. The so-called surface wind speed refers to the speed on the operating surface of the fume hood. If the surface wind speed is too small, the control effect of the fume hood on the operating surface is not enough, and the pollutants in the cabinet can easily get rid of the predetermined airflow discharge path and escape from the fume hood through the operating surface; if the surface wind speed is too large, it is easy to generate turbulence in the area near the exit of the cabinet, affecting the airflow organization form of the fume hood, and pollutants may accumulate in the corners of the fume hood or escape from the operating surface. Generally, the surface wind speed is required to be controlled within the range of 0.4-0.6m / s.

[0059] Compared with the face velocity, the pollutant control concentration can more directly reflect the pollutant control effect of the exhaust hood. In the American ASHRAE 110-2016, the tracer gas depth at the breathing zone of the dummy in front of the hood is used as the control concentration, and the release rate of the tracer gas in the hood is 4L / min of SF6.

[0060] The main reason for the leakage of the fume hood is that there is no good airflow organization inside and outside the fume hood. The two important factors to ensure good airflow organization are the surface wind speed and the fume hood structure design.

[0061] The importance of face velocity has been mentioned above. The smaller the face velocity, the smaller the airflow inertia, the smaller the airflow anti-interference ability, and the fluctuation of pollutants in the cabinet can easily change the predetermined airflow organization, thereby escaping from the exhaust cabinet operation port.

[0062] The structural design of the fume hood is an important factor in determining the performance of the fume hood. Leakage in the fume hood generally occurs at the junction of the fluid and the wall. There are two reasons for this:

[0063] 1. Due to the viscosity of the fluid, the flow velocity is smaller the closer to the wall. The smaller the flow velocity, the smaller the flow inertia and the worse the anti-interference ability of the airflow;

[0064] 2. Due to the left and right sides of the exhaust cabinet operation port and the lower threshold 12a (reference Figure 1 ), improper design of the handle 16 at the lower edge of the window will cause the air flow boundary layer to separate, forming vortices, increasing the possibility of pollutants in the cabinet escaping.

[0065] First embodiment

[0066] For this purpose, refer to Figure 1 and Figure 2 The present invention provides a ventilation device 10, which includes a cabinet 11. The cabinet 11 has a front wall 11a, a rear wall, a left wall, a right wall, an upper wall and a lower wall. The front wall 11a and the rear wall are arranged opposite to each other, the left wall and the right wall are arranged opposite to each other, and the upper wall and the lower wall are arranged opposite to each other; a guide plate 20 is arranged on the rear wall. The above-mentioned walls enclose an inner cavity 12 of the cabinet 11, and the inner cavity 12 constitutes a working cavity of the ventilation device 10. Among them, when the ventilation device 10 is placed in an indoor environment, the wall of the cabinet 11 that the user faces during operation is the front wall 11a. A window 14 is provided on the front wall 11a of the cabinet 11, and the window 14 can be viewed along the height direction ( Figure 2 The cabinet body 11 is moved upward (as shown in the X direction) to open to form a front opening 11b open to the indoor environment, the front opening 11b serving as an operation port, and the window 14 is moved downward along the height direction of the cabinet body 11 to the lowest position to close the front opening 11b.

[0067] Among them, the position of the window 14 in the height direction determines the opening size of the front opening 11b. The applicant found that after the window 14 is opened, unpredictable and inconsistent air flow patterns, such as vortex-type air organization near the front opening 11b, will often occur, and negative pressure will be formed at the front opening 11b. If the air system in the working chamber of the ventilation device 10 has turbulence and vortex, and under the action of negative pressure, it will cause the risk of air overflow. When the pollutants in the working chamber overflow from the front opening 11b to the breathing area due to the turbulence and the negative pressure at the front opening 11b, the indoor workers will be at risk of inhaling pollutants in the breathing area, posing a threat to the health and safety of the indoor workers.

[0068] To this end, the present invention is provided with a handle 16 on the side of the window 14 facing away from the inner cavity 12, and a ventilation gap 17 is provided between the handle 16 and the window 14. Figure 3In the height direction, the ventilation gap 17 has a first opening 17b and a second opening 17a. The first opening 17b is arranged toward the working cavity (i.e., toward the inner cavity 12). The cross-sectional area of ​​the first opening 17b is smaller than the cross-sectional area of ​​the second opening 17a. In addition, the cabinet 11 is also provided with a lower air supply port 30. The lower air supply port 30 is arranged below the cabinet 11 and toward the inner cavity 12 to supply air into the working cavity. Fig.10 The black arrow shows the wind direction.

[0069] The “cross-sectional area” is the area of ​​a plane cut by a plane that is parallel to both the upper wall and the lower wall of the cabinet 11. It can also be understood as the size of the first opening 17b along the width direction of the cabinet 11 and the size along the depth direction of the cabinet 11 ( Figure 3 The product of the cross-sectional area of ​​the first opening 17b, the dimension of the second opening 17a along the width direction of the cabinet 11 and the dimension along the depth direction of the cabinet 11 ( Figure 3 When the first opening 17b and the second opening 17a have the same size in the width direction of the cabinet 11, the size of the first opening 17b in the depth direction of the cabinet 11 is smaller than the size of the second opening 17a in the depth direction of the cabinet 11.

[0070] refer to Figure 2 The air supply from the lower air supply port 30 is combined with the wind flowing through the ventilation gap 17 to form a side "eight"-shaped air flow effect, realizing the ventilation Venturi effect, so that the intermediate wind speed is sandwiched in the middle, the flow rate is faster, and the air flow rate from the front opening 11b toward the working chamber is fast. The air flow rate at the front opening 11b is accelerated, preventing internal pollutants from overflowing at the front opening 11b, which can better control leakage, reduce the risk of indoor workers inhaling pollutants, and improve the isolation between the ventilation equipment and operators.

[0071] Among them, reference Figure 1 and Figure 2 , the lower air outlet 30 is along the width direction of the cabinet 11 ( Figure 1 The ventilation gap 17 extends along the width direction of the cabinet 11 ( Figure 1 The size of the lower air outlet 30 in the width direction is greater than or equal to the size of the ventilation gap 17 in the width direction. The size of the ventilation gap 17 in the width direction is greater than or equal to the size of the window 14 in the width direction. This design ensures the formation of a continuous air supply structure, which is conducive to the cooperation of the ventilation gap 17 and the lower air outlet 30 to form a side "eight"-shaped air flow effect, realizing the ventilation Venturi effect.

[0072] In addition, a lower air outlet 30 is provided below the cabinet 11, and the lower air outlet 30 actively supplies air to the inner cavity 12 of the ventilation device, forming a "push-pull principle" with the negative pressure behind the guide plate 20 in the ventilation device, and at the same time forming a wind curtain in the plane direction of the window 14 to prevent leakage at the threshold 12a. Due to the design of the handle 16, the first opening 17b and the second opening 17a at the upper edge of the front opening 11b, the fluid can flow smoothly into the working cavity, preventing the boundary layer from separating and generating vortices.

[0073] Specifically, refer to Fig.12 Combined with Fig.10 As shown in the figure, it can be seen from the velocity streamline diagram and the velocity distribution diagram that the wind speed coming out of the small end of the bottom of the ventilation gap 17 is higher than the indoor wind speed, and the fluid coming out of the lower air outlet 30, on the one hand, actively supplies air to the inner cavity of the ventilation equipment, forming a "push-pull principle" with the negative pressure on the rear side of the guide plate 20; on the other hand, the plane feature of the lower air outlet 30 forms a wind curtain in the direction of the window plane to prevent leakage at the threshold. Therefore, the lower air outlet 30 and the ventilation gap 17 are used in combination to effectively prevent the overflow of internal pollutants caused by turbulence, and reduce the risk of indoor workers inhaling pollutants.

[0074] Specifically, refer to Fig.10 The lower air outlet 30 includes a first part 31 and a second part 32 connected to each other. The opening of the first part 31 faces the window 14, and the opening of the second part 32 faces the rear wall of the cabinet 11. The surface of the first part 31 is a plane, and the surface of the second part 32 is a plane or a convex arc surface. Among them, the distance H between the outer side of the window 14 and the leftmost end of the lower air outlet 30 is in the range of 0mm to 20mm, excluding the end value, that is, the projection of the window 14 along the height direction is completely located in the area where the lower air outlet 30 is located.

[0075] Since the first part 31 is a plane, the plane characteristic air outlet of the lower air outlet 30 forms an upward wind curtain, and the left side of the wind curtain exceeds the outside of the window 14. A too large H will cause energy waste. The height J of the lower air outlet 30 is in the range of 40mm to 60mm. If the J value is too small, the air volume pushed to the guide plate 20 is small, and the thrust is insufficient. If the J value is too large, the threshold 12a is high, the operating space is small, and the operating discomfort is increased. The length K of the lower air outlet 30 is in the range of 55mm to 85mm. If the K value is too small, the horizontal characteristic length is not enough to form an effective wind curtain on the plane. If the K value is too large, the table operating space P is small.

[0076] In summary, the coordinated use of the ventilation gap 17 and the lower air outlet 30 produces a ventilation Venturi effect, which can better control leakage, reduce the risk of indoor workers inhaling pollutants, and improve the isolation between the ventilation equipment and the operators.

[0077] In addition, since the handle 16 of the present invention is provided with a ventilation gap 17, and the cross-sectional area of ​​the first opening 17b of the ventilation gap 17 is smaller than the cross-sectional area of ​​the second opening 17a, the wind enters the ventilation gap 17 through the second opening 17a with a larger opening, and then enters the working chamber through the first opening 17b with a smaller opening. That is, the air first enters the large area of ​​the ventilation gap 17, and then blows from the small area of ​​the ventilation gap 17 to the working chamber of the cabinet 11 and the bottom of the cabinet 11. Figure 2 The black dashed arrows in the figure represent the direction of air flow.

[0078] As mentioned above, the cross-sectional area of ​​the first opening 17b of the ventilation gap 17 is smaller than the cross-sectional area of ​​the second opening 17a, so that the airflow speed of the wind from the first opening 17b to the inner cavity 12 of the cabinet 11 can be increased. Figure 4 Combined with Figure 1 and Figure 2 As shown, along the width direction of the cabinet 11 ( Figure 1 and Figure 4 The ventilation gap 17 has a third opening 17c and a fourth opening 17d at both ends thereof. This means that the ventilation gap 17 is also provided with openings at both ends thereof in the width direction. In this way, the outside air can enter the ventilation gap 17 from the third opening 17c and the fourth opening 17d on the side and be blown out from the first opening 17b with a smaller opening. The third opening 17c and the fourth opening 17d increase the air intake of the ventilation gap 17, that is, the ventilation gap 17 is not only supplied with air from the second opening 17a, but also from the third opening 17c and the fourth opening 17d. When the size of the first opening 17b remains unchanged, increasing the air intake can further speed up the air flow velocity of the air sent out from the first opening 17b, so as to better sweep the pollutants overflowing into the breathing area into the working chamber.

[0079] Continue to refer Figure 4 Combined with Figure 3 As shown, in this embodiment, the first opening 17b extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively, and the second opening 17a extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively. This is equivalent to the openings of the ventilation gap 17 being fully connected, and the wind can be blown from the ventilation gap 17 to the inner cavity 12 of the cabinet 11 as much as possible, thereby improving the utilization rate of the air; at the same time, it is also beneficial to increase the air flow speed of the air sent out from the first opening 17b.

[0080] According to the above description, the closer to the side wall, the slower the flow rate, and the easier it is to leak. Therefore, the first opening 17b extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively, and the second opening 17a extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively, to prevent the formation of boundary layer separation at the lower end of the handle 16 and the vortex generated.

[0081] It should be noted that the specific shape of the ventilation gap 17 of the present invention is not limited, as long as the following conditions are met: the cross-sectional area of ​​the first opening 17b of the ventilation gap 17 is smaller than the cross-sectional area of ​​the second opening 17a, which is conducive to increasing the air flow speed of the air sent out by the first opening 17b. That is, the specific shape of the area between the first opening 17b and the second opening 17a of the ventilation gap 17 is not limited. In this embodiment, reference Figure 5 , the cross-sectional area of ​​the ventilation gap 17 gradually decreases from the second opening 17a to the first opening 17b. In other embodiments, it can be other types, for example, the cross-sectional area of ​​the ventilation gap 17 decreases arithmetic or unequally in the direction from the second opening 17a to the first opening 17b. Regardless of the specific shape of the area between the first opening 17b and the second opening 17a of the ventilation gap 17, as long as the cross-sectional area of ​​the first opening 17b is smaller than the cross-sectional area of ​​the second opening 17a, the airflow velocity of the air sent out by the first opening 17b can be increased.

[0082] refer to Figure 2 The fume hood of the present invention further comprises a base 15, and the bottom of the window 14 is provided with a base 15. Figure 3 , the portion of the handle 16 facing the window 14 is a concave arc surface 16a, and the concave arc surface 16a is concave in the direction away from the window 14. Among them, the portion "facing the window" includes: the portion of the handle 16 facing the base 15 and the portion facing the window 14. In addition, the portion of the base 15 facing the handle 16 is a plane 15a and a convex arc surface 15b, and the convex arc surface 15b is convex toward the handle 16 and is located below the base 15. The use of the arc surface design smoothly transitions the change in the direction of the airflow, which is conducive to guiding the air entering the ventilation gap 17 to sweep toward the inner cavity 12 of the cabinet 11 and the bottom of the cabinet 11 to form an "air barrier"; it can also increase the airflow speed of the air at the first opening 17b.

[0083] Among them, reference Figure 3 In this embodiment, the convex arc surface 15b is closer to the working cavity than the plane 15a, which is more conducive to guiding the air entering the ventilation gap 17 to sweep toward the inner cavity 12 of the cabinet 11 and the bottom of the cabinet 11 to form an "air barrier"; further increasing the air flow velocity at the first opening 17b.

[0084] The design of the outer convex arc surface 15b, the inner concave arc surface 16a, the first opening 17b, and the second opening 17a combined with the lower air supply port 30 is conducive to forming a ventilation Venturi effect, which can better control leakage, reduce the risk of indoor workers inhaling pollutants, and improve the isolation between ventilation equipment and operators.

[0085] It should be noted that the specific shape of the portion of the base 15 facing the handle 16 is not limited. Figure 3 FIG. 1 shows that the portion of the base 15 facing the handle 16 is composed of a flat surface 15a and an outer convex curved surface 15b. Figure 6 The portion of the base 15 facing the handle 16 is a plane 15a.

[0086] For example, refer to Figure 5 , the portion of the handle 16 facing the base 15 is a plane, and the portion of the base 15 facing the handle 16 is a plane. In other embodiments, the portion of the handle 16 facing the base 15 is a plane, or the portion of the base 15 facing the handle 16 is a plane. For another example, referring to Figure 7 , the portion of the handle 16 facing the base 15 is the first plane 16b and the second plane 16c set at an angle, and the portion of the base 15 facing the handle 16 is the third plane 15c and the fourth plane 15d set at an angle. In other embodiments, the portion of the handle 16 facing the base 15 is the first plane 16b and the second plane 16c set at an angle, or the portion of the base 15 facing the handle 16 is the third plane 15c and the fourth plane 15d set at an angle.

[0087] In summary, no matter how the specific shape of the area between the first opening 17b and the second opening 17a of the ventilation gap 17 is designed, as long as the cross-sectional area of ​​the first opening 17b is smaller than the cross-sectional area of ​​the second opening 17a, the air flow velocity of the air sent out from the first opening 17b can be increased. For example, the portion of the handle 16 facing the base 15 and / or the portion of the base 15 facing the handle 16 is composed of a plane, a curved surface or any other shape.

[0088] Continue to refer Figure 2 Combined with Figure 3 , Figure 4 and Figure 6 As shown, the handle 16 and the viewing window 14 are spaced apart and connected via at least one connecting component 18 , and the connecting component 18 is located in the ventilation gap 17 . Figure 4 Three connecting parts 18 are shown in the figure. In other embodiments, other numbers of connecting parts 18 may be provided. The specific type of the connecting parts 18 is not limited. In this embodiment, the connecting parts 18 are bolts. The connecting parts 18 are located in the ventilation gap 17 and can play a role in connecting the handle 16 and the window 14.

[0089] Continue to refer Figure 3 The portion of the handle 16 facing away from the viewing window 14 is an outwardly convex arc surface 16aa, which is convenient for the user to hold the handle 16 on the one hand, and guides the air outside the handle 16 to blow along the outwardly convex arc surface 16aa toward the inner cavity 12 of the cabinet 11 and the bottom of the cabinet 11, so that pollutants overflowing into the breathing area can be swept into the working cavity, guiding the pollutants away from the user's breathing area.

[0090] At the same time, reference Figure 2 The outer convex arc surface 16aa is combined with the outer convex arc surface 15b, the inner concave arc surface 16a, the first opening 17b, the second opening 17a and the lower air supply port 30, which is conducive to forming a ventilation Venturi effect, can better control leakage, reduce the risk of indoor workers inhaling pollutants, and improve the isolation between the ventilation equipment and the operators.

[0091] In addition, reference Figure 2 An upper air supply port 13 is also provided above the cabinet 11. The upper air supply port 13 is located on the side of the window 14 facing away from the inner cavity 12 of the cabinet 11. The upper air supply port 13 is arranged toward the second opening 17a to supply air into the working cavity through the ventilation gap 17.

[0092] Continue to refer Figure 1 and Figure 2 , the upper air outlet 13 is along the width direction of the cabinet 11 ( Figure 1 The ventilation gap 17 extends along the width direction of the cabinet 11 ( Figure 1 The upper air outlet 13 extends in the width direction (as shown in the Y direction), and the size of the upper air outlet 13 in the width direction is greater than or equal to the size of the ventilation gap 17 in the width direction. The size of the ventilation gap 17 in the width direction is greater than or equal to the size of the window 14 in the width direction. This design ensures the formation of a continuous air supply structure, so that the air blown out from the upper air outlet 13 can be blown to the ventilation gap 17 over a large area, and then quickly blown to the window 14 from the ventilation gap 17, sweeping the pollutants overflowing into the breathing area into the working chamber, and guiding the pollutants away from the user's breathing area.

[0093] refer to Figure 8 , the distance A between the outside of the window 14 and the handle 16 (i.e. Figure 3The value of A is shown in Figure 1 (L) between 30mm and 50mm, including 30mm and 50mm. The larger the value of A, the more the handle 16 extends out, affecting the operator's breathing area and increasing discomfort (touching the nose); the smaller the value of A, the smaller the second opening 17a at the upper end of the handle 16, and the smaller the amount of air entering. In addition, the distance B between the outer side of the window 14 and the inner side of the upper air outlet 13 is within the range of A±10mm, including A+10mm and A-10mm. If the value of B is too small, the air discharged from the upper air outlet 13 directly hits the window 14, resulting in a loss of kinetic energy. If B is too large, most of the air volume is on the left outer side of the handle 16, and the amount of air entering the handle 16 is small. In addition, the width C of the upper air outlet 13 is 2*A-15mm. If C is too large, the amount of air flowing downward from the outer side of the handle 16 is large, which interferes with the indoor wind entering the front opening 11b of the ventilation device from the room. If C is too small, the flow section of the upper air outlet 13 is small, the resistance is large, and the energy consumption of the air supply fan is large. Meanwhile, an upper air outlet 13 that is too small will generate an excessively high wind speed at the outlet. Figure 8 The figure shows that the surface of the upper air outlet 13 is a curved surface. In other embodiments, the surface of the upper air outlet 13 is a 45° inclined surface.

[0094] refer to Fig. 9 , the vertical distance D between the bottom of the base 15 and the bottom of the handle 16 is between 0 and 40 mm, including 40 mm and excluding 0 mm; the horizontal distance E between the bottom of the base 15 and the bottom of the handle 16 (i.e. Figure 3 When E=0, the air supply direction is perpendicular to the window 14. When E=0, D takes the maximum value of 40. On the contrary, when E=40, D=0, ensuring the size of the first opening 17b at the lower side of the handle 16. In addition, refer to Fig. 9 The angle α between the line between the top and the bottom of the handle 16 and the window 14 is between 20° and 45°, including 20° and 45°. The ventilation gap 17 designed according to the above parameters is conducive to catching wind so that air enters the working chamber of the ventilation device through the ventilation gap 17, preventing pollutants in the ventilation device from overflowing.

[0095] refer to Figure 2 and Fig.10 After the lower air outlet 30 and the upper air outlet 13 are simultaneously set on the ventilation equipment, combined with Fig.13 Combined with Figures 1 to 3, it can be seen from the velocity streamline diagram and the velocity distribution diagram that the fluid coming out of the upper air outlet 13 reaches the ventilation gap 17, and the wind speed coming out of the small end of the ventilation gap 17 reaches about 0.6m / s (not limited to 0.6m / s), and the wind speed increases. This flow rate can effectively control the fluctuation of the exhaust volume and the disturbance caused by the generation of pollutants in the ventilation equipment, and reduce the leakage rate. The fluid coming out of the lower air outlet 30, on the one hand, cooperates with the ventilation gap 17 to form a ventilation Venturi effect; on the other hand, it actively supplies air to the lower end of the inner cavity of the ventilation equipment, and forms a "push-pull principle" with the negative pressure on the rear side of the guide plate 20; in addition, the plane feature of the lower air outlet 30 forms a wind curtain in the direction of the window plane to prevent leakage at the threshold. Therefore, the upper air outlet 13, the lower air outlet 30 and the ventilation gap 17 are used in combination to effectively prevent the overflow of internal pollutants caused by turbulence, and reduce the risk of indoor workers inhaling pollutants.

[0096] Second embodiment

[0097] The difference between this embodiment and the first embodiment is that only the upper air outlet 13 is provided in this embodiment, and the lower air outlet 30 is not provided. The rest of the designs are the same, such as the design of the ventilation gap 17, the design of the handle 16, the design of the window 14, etc. Figure 1 and Figure 2 An upper air supply port 13 is provided above the cabinet 11. The upper air supply port 13 is located on the side of the window 14 facing away from the inner cavity 12 of the cabinet 11. The upper air supply port 13 is arranged toward the second opening 17a of the ventilation gap to supply air into the working cavity through the ventilation gap 17.

[0098] Since the handle 16 of the present invention is provided with a ventilation gap 17, and the cross-sectional area of ​​the first opening 17b of the ventilation gap 17 is smaller than the cross-sectional area of ​​the second opening 17a, and the upper air supply port 13 is combined to supply air to the ventilation gap 17, the air enters the ventilation gap 17 from the second opening 17a with a large opening, and then enters the working chamber from the first opening 17b with a small opening. That is, the air delivered to the ventilation gap 17 by the upper air supply port 13 will first enter the large area of ​​the ventilation gap 17, and then be blown to the working chamber of the cabinet 11 and the bottom of the cabinet 11 from the small area of ​​the ventilation gap 17. Figure 2 The black dashed arrows in the figure represent the direction of air flow.

[0099] refer to Fig.11 Combined with Figures 1 to 3 , Fig.11 The figure shows the flow trajectory of the fluid from the upper air outlet 13 to the ventilation gap 17 and then to the ventilation device. Fig.11 Combined with Figures 1 to 3 , Fig.11It is shown that the fluid flows out from the upper air outlet 13 at a wind speed of about 0.3m / s (not limited to 0.3m / s), and the speed increases to about 0.6m / s (not limited to 0.6m / s) after reaching the small end of the ventilation gap 17. This flow rate can effectively control the fluctuation of the exhaust volume and the disturbance when pollutants are generated in the ventilation equipment, and reduce the leakage rate.

[0100] That is, the first opening 17b with a small opening speeds up the airflow velocity of the air sent out by the first opening 17b, and can sweep the pollutants overflowing into the breathing area into the working chamber, guiding the pollutants away from the user's breathing area. This is equivalent to accelerating the airflow velocity of the air at the front opening 11b under the joint action of the upper air supply port 13 and the ventilation gap 17, and the air blown from the ventilation gap 17 to the inner cavity 12 of the cabinet 11 and the bottom of the cabinet 11 forms an "air barrier", preventing the negative pressure and turbulence formed at the front opening 11b from causing internal pollutants to overflow, thereby reducing the risk of indoor workers inhaling pollutants.

[0101] As mentioned above, the cross-sectional area of ​​the first opening 17b of the ventilation gap 17 is smaller than the cross-sectional area of ​​the second opening 17a. Under the coordinated action of the upper air outlet 13, the air flow velocity of the wind blowing from the first opening 17b to the inner cavity 12 of the cabinet 11 and the lower part of the cabinet 11 can be accelerated. The upper air outlet 13 of the present invention has an air inlet port and an air outlet port. The air inlet port is connected to the air inlet channel (not shown) of the ventilation device 10 or to the air inlet channel of the indoor environment, and is used to blow air to the inner cavity 12 of the cabinet 11 and the lower part of the cabinet 11. Among them, the air outlet port is arranged toward the second opening 17a of the ventilation gap 17.

[0102] Continue to refer Figure 4 Combined with Figure 3 As shown, in this embodiment, the first opening 17b extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively, and the second opening 17a extends along the width direction of the cabinet 11 to communicate with the third opening 17c and the fourth opening 17d respectively. The openings equivalent to the ventilation gap 17 are fully connected, which is conducive to the upper air supply port 13 blowing air to the ventilation gap 17, and the air blown out by the upper air supply port 13 is blown to the inner cavity 12 of the cabinet 11 and the bottom of the cabinet 11 through the ventilation gap 17 as much as possible, thereby improving the utilization rate of the air blown out by the upper air supply port 13; at the same time, it is also conducive to improving the air flow speed of the air sent out by the first opening 17b.

[0103] Continue to refer Figure 1 and Figure 2 , the upper air outlet 13 is along the width direction of the cabinet 11 ( Figure 1 The ventilation gap 17 extends along the width direction of the cabinet 11 ( Figure 1The upper air outlet 13 extends in the width direction (as shown in the Y direction), and the size of the upper air outlet 13 in the width direction is greater than or equal to the size of the ventilation gap 17 in the width direction. The size of the ventilation gap 17 in the width direction is greater than or equal to the size of the window 14 in the width direction. This design ensures the formation of a continuous air supply structure, so that the air blown out from the upper air outlet 13 can be blown to the ventilation gap 17 over a large area, and then quickly blown to the window 14 from the ventilation gap 17, sweeping the pollutants overflowing into the breathing area into the working chamber, and guiding the pollutants away from the user's breathing area.

[0104] refer to Figure 8 , the distance A between the outside of the window 14 and the handle 16 (i.e. Figure 3 The value of A is shown in Figure 1 (L) between 30mm and 50mm, including 30mm and 50mm. The larger the value of A, the more the handle 16 extends out, affecting the operator's breathing area and increasing discomfort (touching the nose); the smaller the value of A, the smaller the second opening 17a at the upper end of the handle 16, and the smaller the amount of air entering. In addition, the distance B between the outer side of the window 14 and the inner side of the upper air outlet 13 is within the range of A±10mm, including A+10mm and A-10mm. If the value of B is too small, the air discharged from the upper air outlet 13 directly hits the window 14, resulting in a loss of kinetic energy. If B is too large, most of the air volume is on the left outer side of the handle 16, and the amount of air entering the handle 16 is small. In addition, the width C of the upper air outlet 13 is 2*A-15mm. If C is too large, the amount of air flowing downward from the outer side of the handle 16 is large, which interferes with the indoor wind entering the front opening 11b of the ventilation device from the room. If C is too small, the flow section of the upper air outlet 13 is small, the resistance is large, and the energy consumption of the air supply fan is large. Meanwhile, an upper air outlet 13 that is too small will generate an excessively high wind speed at the outlet. Figure 8 The figure shows that the surface of the upper air outlet 13 is a curved surface. In other embodiments, the surface of the upper air outlet 13 is a 45° inclined surface.

[0105] In summary, the above embodiments provided by the present invention are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A ventilation device, characterized in that: include: The cabinet has an inner cavity, and the inner cavity constitutes a working cavity; A viewing window is provided on the front wall of the cabinet, and the viewing window can be opened along the height direction of the cabinet to form a front opening open to the indoor environment; A handle is arranged on a side of the window facing away from the inner cavity, a ventilation gap is provided between the handle and the window, and along the height direction, the ventilation gap has a first opening and a second opening, the first opening is arranged toward the working cavity, and a cross-sectional area of ​​the first opening is smaller than a cross-sectional area of ​​the second opening; A lower air supply port is provided below the cabinet, and the lower air supply port is arranged toward the inner cavity so as to supply air into the working cavity; An upper air supply port is arranged above the cabinet and located on a side of the window facing away from the inner cavity, and the upper air supply port is arranged toward the second opening to supply air into the working cavity through the ventilation gap; The lower air outlet includes a first part and a second part that are connected, wherein an opening of the first part faces the viewing window, and an opening of the second part faces a rear wall of the cabinet.

2. The ventilation device according to claim 1, characterized in that Along the width direction of the cabinet, two ends of the ventilation gap are respectively provided with a third opening and a fourth opening.

3. The ventilation device according to claim 2, characterized in that The first opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively, and the second opening extends along the width direction of the cabinet to be communicated with the third opening and the fourth opening respectively.

4. The ventilation device according to claim 1, characterized in that In a direction from the second opening to the first opening, a cross-sectional area of ​​the ventilation gap gradually decreases.

5. The ventilation device according to claim 4, characterized in that The portion of the handle facing the window is a concave arc surface.

6. The ventilation device according to claim 1 or 4, characterized in that: It also includes a base, which is arranged at the bottom of the window, and a portion of the base facing the handle is a plane.

7. The ventilation device according to claim 1 or 4, characterized in that: It also includes a base, which is arranged at the bottom of the window, and the part of the base facing the handle is a flat surface and an outwardly convex arc surface, and the outwardly convex arc surface protrudes toward the handle and is located below the base.

8. The ventilation device according to claim 7, characterized in that The outer convex arc surface is closer to the working chamber than the plane.

9. The ventilation device according to claim 1 or 4, characterized in that: It also includes a base, the bottom of the window is provided with the base, the portion of the handle facing the base is a plane, and / or the portion of the base facing the handle is a plane.

10. The ventilation device according to claim 1 or 4, characterized in that: It also includes a base, the bottom of the window is provided with the base, the portion of the handle facing the base is a first plane and a second plane set at an angle, and / or the portion of the base facing the handle is a third plane and a fourth plane set at an angle.

11. The ventilation device according to claim 1, characterized in that The handle and the window are spaced apart and connected via at least one connecting component, and the connecting component is located in the ventilation gap.

12. The ventilation device according to claim 1, characterized in that The portion of the handle facing away from the viewing window is an outwardly convex curved surface.

13. The ventilation device according to claim 1, characterized in that The lower air outlet extends along the width direction of the cabinet, the ventilation gap extends along the width direction of the cabinet, the size of the lower air outlet in the width direction is greater than or equal to the size of the ventilation gap in the width direction, and the size of the ventilation gap in the width direction is greater than or equal to the size of the window in the width direction.

14. The ventilation device according to claim 2, characterized in that The upper air outlet extends along the width direction of the cabinet, the ventilation gap extends along the width direction of the cabinet, the size of the upper air outlet in the width direction is greater than or equal to the size of the ventilation gap in the width direction, and the size of the ventilation gap in the width direction is greater than or equal to the size of the window in the width direction.

15. The ventilation device according to claim 1, characterized in that The projection of the viewing window along the height direction is completely located in the area where the lower air outlet is located.

16. The ventilation device according to claim 1, characterized in that The surface of the first part is a plane, and the surface of the second part is a plane or a convex arc surface.

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