Weighing cover capable of adjusting wind speed

Abstract

The utility model discloses a weighing cover capable of adjusting air speed, which comprises a cover body, a working area arranged on the front side of the cover body, a backflow area arranged on the rear side of the cover body, a laminar flow cover arranged on the upper side of the cover body, a backflow area communicated with the laminar flow cover, a secondary filtering system and a fan arranged in the backflow area, an air inlet arranged at the bottom of the front side of the backflow area, and an air supply system arranged in the laminar flow cover. An air passing hole is formed in the bottom of the laminar flow cover, a distance induction sensor capable of inducting the height of the operation surface is arranged below the air supply system in the laminar flow cover, and the distance induction sensor is electrically connected with the air supply system; the distance induction sensor capable of inducting the height of the operation surface is arranged below the air supply system in the laminar flow cover, and the distance induction sensor is electrically connected with the air supply system, so that the distance induction sensor can detect and judge the height of the operation surface in the working area and then transmit a signal to the air supply system; the air supply system can release and convey different air speeds according to the heights of the operation surfaces, that is, the air speed can be adjusted adaptively when the operation surfaces with different heights are weighed.

Description

Technical Field

[0001] The utility model belongs to the technical field of weighing hoods, in particular to a weighing hood with adjustable wind speed. Background Art

[0002] Weighing hood is a kind of local purification equipment used in pharmaceutical, microbiological research and scientific experiments. It provides a vertical one-way airflow. Part of the clean air circulates in the working area, and part is discharged to the nearby area, so that negative pressure is generated in the working area to prevent cross contamination and ensure a high cleanliness environment in the working area.

[0003] Regarding the weighing cover, in the prior art, after searching, the utility model patent with Chinese patent publication number CN219455289U discloses a silent weighing cover, such as Figure 1 As shown, it mainly includes a cover body a, a working area b is arranged on the front side of the cover body a, a rear reflow area c is arranged on the rear side of the cover body a, a laminar flow cover d is arranged on the upper side of the cover body a, the reflow area c and the laminar flow cover d are communicated, a flow hole e is arranged at the bottom of the laminar flow cover d, a secondary filter f is arranged at the bottom of the reflow area c, an air inlet g is arranged on the front side of the reflow area c at a position corresponding to the secondary filter f, a fan g is arranged on the upper part of the secondary filter f in the reflow area c, and an air supply system k is arranged in the laminar flow cover d.

[0004] In the prior art, weighing hoods similar to the above-mentioned technical solutions are found to have room for improvement during actual implementation: the wind speed of the air supply in the weighing hood is fixed, but the items weighed in actual implementation are diverse, and the operating surface is divided into many heights. The wind speed at each height needs to reach a certain value to implement the downward protection of the air flow laminar flow, resulting in poor protection effect at lower positions of the operating surface in some weighing processes, creating a risk of cross contamination, and a risk of materials being blown away at higher positions of the operating surface. Therefore, when weighing at operating surfaces at different heights, the wind speed cannot be adjusted accordingly. Utility Model Content

[0005] In view of the shortcomings and defects in the prior art, the purpose of the utility model is to provide a weighing hood with adjustable wind speed, which solves the problem that the wind speed of the weighing hood in the prior art cannot be adjusted accordingly when weighing on operating surfaces at different heights.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: a weighing hood with adjustable wind speed, comprising a hood body, a working area is provided on the front side of the hood body, a reflow area is provided on the rear side of the hood body, a laminar flow hood is provided on the upper side of the hood body, the reflow area is communicated with the laminar flow hood, a secondary filtration system and a fan are provided in the reflow area, an air inlet is provided at the bottom of the front side of the reflow area, an air supply system is provided in the laminar flow hood, air holes are provided at the bottom of the laminar flow hood, a distance sensing sensor capable of sensing the height of an operating surface is provided below the air supply system in the laminar flow hood, the distance sensing sensor is electrically connected to the air supply system, a filter net is detachably provided on the front side of the air inlet, a filter membrane is detachably provided on the front side of the filter net, and a dust collecting box is provided at the bottom of the working area at the lower side of the air inlet.

[0007] As a further improvement of the utility model, the filter screen is connected to the reflow zone by bolts.

[0008] As a further improvement of the utility model, the edges around the filter membrane are bonded to the filter screen.

[0009] As a further improvement of the utility model, a flow equalizing membrane is detachably provided at the bottom of the laminar flow hood.

[0010] As a further improvement of the utility model, the flow balancing membrane is connected to the laminar flow hood by bolts.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] 1. A distance sensing sensor capable of sensing the height of the operating surface is arranged below the air supply system in the laminar flow hood, and the distance sensing sensor is electrically connected to the air supply system. The distance sensing sensor can detect and determine the height of the operating surface in the working area, and then transmit the signal to the air supply system. The air supply system can release and deliver different wind speeds according to the height of the operating surface. When the height of the operating surface is low, the distance sensing sensor sends a high wind speed signal, and the air supply system delivers a larger amount of air. When the height of the operating surface is high, the distance sensing sensor sends a low wind speed signal, and the air supply system delivers a smaller amount of air. This allows the air volume at the height of the operating surface to achieve an adaptive balance, that is, when operating surfaces at different heights are weighed, the wind speed can be adjusted accordingly.

[0013] In addition, by setting a filter at the air inlet and a filter membrane on the front side of the filter, the incoming air can be filtered to prevent external impurities from entering the reflux area. In addition, by setting a filter membrane, the air can be further filtered, and the filter membrane can be conveniently removed for cleaning. After the filter membrane is removed, the weighing hood can still work, and the filter can still filter the air without stopping.

[0014] In addition, a dust collecting box is provided at the lower side of the air inlet at the bottom of the working area. When the filter net or filter membrane filters dust or impurities, it will receive the impurities or dust falling from above, preventing dust or impurities from falling into the working area and increasing the difficulty of cleaning.

[0015] 2. A detachable flow-equalizing membrane is provided at the bottom of the laminar flow hood, so that the wind can be evenly dispersed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 It is a structural schematic diagram of the prior art;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 for Figure 2 A magnified view at point A;

[0020] Figure 4 for Figure 2 Enlarged view at B;

[0021] In the figure: 1. hood body; 2. working area; 3. laminar flow hood; 4. secondary filtration system; 5. fan; 6. air inlet; 7. air supply system; 8. air hole; 9. distance sensing sensor; 10. filter screen; 11. filter membrane; 12. dust collecting box; 13. flow equalizing membrane; 14. recirculation area. DETAILED DESCRIPTION

[0022] The following is combined with Figure 2-4 The utility model is further described in detail. For a clearer illustration, only the structure related to the utility model is shown in the figure.

[0023] For the convenience of description, the coordinate system is defined as Figure 2 As shown, the left-right direction is the horizontal direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0024] The utility model embodiment discloses a wind speed adjustable weighing hood. Figure 2 A wind speed adjustable weighing hood comprises a hood body 1, a working area 2 is arranged at the front side of the hood body 1, a reflow area 14 is arranged at the rear side of the hood body 1, a laminar flow hood 3 is arranged at the upper side of the hood body 1, the reflow area 14 is communicated with the laminar flow hood 3, a secondary filtering system 4 and a fan 5 are arranged in the reflow area 14, the secondary filtering system 4 is a primary high efficiency filter and a high-grade high efficiency filter, such as Figure 3As shown, an air inlet 6 is provided at the bottom of the front side of the recirculation zone 14, an air supply system 7 is provided in the laminar flow hood 3, and an air hole 8 is provided at the bottom of the laminar flow hood 3. A distance sensing sensor 9 capable of sensing the height of the operating surface is provided below the air supply system 7 in the laminar flow hood 3, and the distance sensing sensor 9 is electrically connected to the air supply system 7. A filter screen 10 is detachably provided at the front side of the air inlet 6 by bolts, and a filter membrane 11 is detachably provided at the front side of the filter screen 10. Specifically, the edges of the filter membrane 11 are bonded to the filter screen 10. A dust collecting box 12 is provided at the lower side of the air inlet 6 at the bottom of the working area 2. The dust collecting box 12 is provided at the lower side of the air inlet 6 at the bottom of the working area 2. When the filter screen 10 or the filter membrane 11 filters dust or impurities, it will receive the impurities or dust falling from above, so as to prevent dust or impurities from falling into the working area 2 and increasing the difficulty of cleaning.

[0025] In addition, if Figure 2 and Figure 4 As shown, a flow balancing membrane 13 is detachably provided at the bottom of the laminar flow hood 3 , and the flow balancing membrane 13 is bolted to the laminar flow hood 3 .

[0026] The utility model provides a distance sensing sensor 9 capable of sensing the height of the operating surface below the air supply system 7 in the laminar flow hood 3. The distance sensing sensor 9 is electrically connected to the air supply system 7. The distance sensing sensor 9 can detect and determine the height of the operating surface in the working area 2, and then transmit the signal to the air supply system 7. The air supply system 7 can release and deliver different wind speeds according to the height of the operating surface. When the height of the operating surface is low, the distance sensing sensor 9 emits a high wind speed signal, and the air supply system 7 delivers a larger air volume. When the height of the operating surface is high, the distance sensing sensor 9 emits a low wind speed signal, and the air supply system 7 delivers a smaller air volume, so that the air volume at the height of the operating surface can reach an adaptive balance.

[0027] In addition, by providing a filter net 10 at the air inlet 6 and a filter membrane 11 on the front side of the filter net 10, the incoming air can be filtered to prevent external impurities from entering the reflux area 14. In addition, by providing the filter membrane 11, the air can be further filtered, and the filter membrane 11 can be conveniently removed for cleaning. After the filter membrane 11 is removed, the weighing hood can still work, and the filter net 10 can still filter the air without stopping the machine.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. It should be understood that the specific implementation methods described herein are only used to understand the present utility model, and are not used to limit the present utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present utility model.

Claims

1. A weighing hood with adjustable wind speed, comprising a hood body, a working area is arranged on the front side of the hood body, a reflow area is arranged on the rear side of the hood body, a laminar flow hood is arranged on the upper side of the hood body, the reflow area is communicated with the laminar flow hood, a secondary filtration system and a fan are arranged in the reflow area, an air inlet is arranged at the bottom of the front side of the reflow area, an air supply system is arranged in the laminar flow hood, and an air hole is arranged at the bottom of the laminar flow hood, characterized in that: A distance sensing sensor capable of sensing the height of the operating surface is arranged below the air supply system in the laminar flow hood, and the distance sensing sensor is electrically connected to the air supply system. A filter screen is detachably provided on the front side of the air inlet, and a filter membrane is detachably provided on the front side of the filter screen. A dust collecting box is provided on the lower side of the air inlet at the bottom of the working area.

2. The wind speed adjustable weighing hood according to claim 1, characterized in that: The filter screen is connected with the recirculation zone by bolts.

3. The wind speed adjustable weighing hood according to claim 1, characterized in that: The edges of the filter membrane are bonded to the filter net.

4. The wind speed adjustable weighing hood according to claim 1, characterized in that: The bottom of the laminar flow hood is detachably provided with a flow-averaging membrane.

5. The wind speed adjustable weighing hood according to claim 4, characterized in that: The flow balancing membrane is connected with the laminar flow hood by bolts.

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