Fresh air volume control device of micro-positive pressure ventilation system

Abstract

The utility model relates to a micro positive pressure ventilation system technical field, concretely is a kind of fresh air volume control device of micro positive pressure ventilation system, including adjusting box, air inlet pipe, air outlet pipe, fixed plate, the sliding plate being set to the fixed plate is directly opposite, and the driving element for driving the sliding plate is adopted to be close to or away from the fixed plate, the fixed plate and sliding plate will adjust the inside of box from left to right and be separated into air inlet cavity, adjusting cavity and air outlet cavity in order, a plurality of air inlet holes for communicating air inlet cavity and adjusting cavity are provided on the fixed plate, a plurality of adjusting columns of different lengths are provided on the side of fixed plate, the air inlet hole and adjusting column stagger distribution, air outlet hole is provided on the sliding plate and is directly opposite adjusting column, the air outlet hole communicates adjusting cavity and air outlet cavity, the air inlet pipe communicates air inlet cavity, and the air outlet pipe communicates air outlet cavity;The utility model does not need frequent adjustment centrifugal fan, guarantees the service life of centrifugal fan, can also rapidly adjust the exhaust volume of ventilation cabinet, and practicality is better.

Description

Technical Field

[0001] This utility model relates to the technical field of micro-positive pressure ventilation systems, specifically a fresh air volume control device for a micro-positive pressure ventilation system. Background Technology

[0002] A micro-positive pressure ventilation system is a technology that purifies air by controlling the pressure difference between indoors and outdoors. It creates a micro-positive pressure environment indoors by supplying more air through the duct than through the exhaust duct (typically about 10% more), forcing polluted air to escape through the exhaust duct. Existing micro-positive pressure ventilation systems mostly control airflow by installing gas pressure sensors indoors and outdoors, adjusting the operation of the supply fan based on the pressure difference. While this allows for airflow adjustment, actual tests have shown that frequent adjustments can shorten the average lifespan of centrifugal fans by 30%, and it cannot quickly adjust the exhaust volume of fume hoods, resulting in poor practicality. Therefore, a new airflow control device for micro-positive pressure ventilation systems is proposed. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned shortcomings by providing a fresh air volume control device for a micro-positive pressure ventilation system. This eliminates the need for frequent adjustments to the centrifugal fan, ensuring its service life, and also allows for rapid adjustment of the exhaust volume of the fume hood, resulting in improved practicality.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A fresh air volume control device for a micro-positive pressure ventilation system includes an adjustment box, an air inlet pipe and an air outlet pipe connecting the left and right ends of the adjustment box, a fixed plate fixed inside the adjustment box, a sliding plate facing the fixed plate, and a driving component for driving the sliding plate closer to or further away from the fixed plate. The fixed plate and the sliding plate divide the interior of the adjustment box into an air inlet chamber, an adjustment chamber, and an air outlet chamber from left to right. The fixed plate is provided with multiple air inlet holes connecting the air inlet chamber and the adjustment chamber. One side of the fixed plate is provided with multiple adjustment columns of different lengths. The air inlet holes are staggered from the adjustment columns. The sliding plate is provided with an air outlet hole facing the adjustment columns. The air outlet hole connects the adjustment chamber and the air outlet chamber. The air inlet pipe connects to the air inlet chamber, and the air outlet pipe connects to the air outlet chamber.

[0006] Furthermore, the adjusting column includes a short column with one end fixed to a fixed plate, multiple medium and short columns arranged in a ring around the axis of the short column, multiple medium columns arranged in a ring around the axis of the short column, and multiple long columns arranged in a ring around the axis of the short column.

[0007] Furthermore, at least four short columns, medium columns, and long columns are provided.

[0008] Furthermore, the inner wall of the regulating box is provided with multiple sliding grooves, and a slider is slidably connected in the sliding grooves. One end of the slider is fixedly connected to a sliding plate.

[0009] Furthermore, the driving component includes an electric push rod fixed to one end of the adjustment box, a control button electrically connected to the electric push rod, the piston rod head of the electric push rod extending into the adjustment box and drivingly connected to an adjustment rod, an adjustment frame fixed to the end of the adjustment rod, the adjustment rod being coaxially arranged with the piston rod head of the electric push rod, and a plastic telescopic tube being sleeved on the adjustment rod, the two ends of the plastic telescopic tube being sealed and connected to the inner end of the adjustment frame and the adjustment box, and the adjustment frame being fixedly connected to a sliding plate.

[0010] The beneficial effects of this utility model are:

[0011] In practical applications, the regulating box is installed on the exhaust duct of the micro-positive pressure ventilation system via the inlet and outlet pipes. During use, the air blown by the centrifugal fan passes sequentially through the inlet pipe, inlet chamber, inlet hole, regulating chamber, outlet hole, outlet chamber, and outlet pipe. Due to the different lengths of the multiple regulating columns, as the driving component moves the sliding plate closer to the fixed plate, more and more regulating columns gradually insert into the outlet hole, reducing the amount of air that can pass through the outlet hole. Conversely, as the driving component moves the sliding plate away from the fixed plate, the number of regulating columns inserted into the outlet hole decreases, increasing the amount of air that can pass through the outlet hole. This invention eliminates the need for frequent adjustments to the centrifugal fan, ensuring its service life, and also allows for rapid adjustment of the exhaust volume of the fume hood, making it more practical. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a top view of the present invention;

[0014] Figure 3 yes Figure 2 Sectional view at point AA;

[0015] Figure 4 This is a schematic diagram of the structure of the sliding plate and the fixed plate in this utility model;

[0016] Reference numerals: 1. Adjustment box; 11. Air inlet chamber; 12. Adjustment chamber; 13. Air outlet chamber; 14. Slide groove; 2. Air inlet pipe; 3. Air outlet pipe; 4. Fixing plate; 41. Air inlet hole; 5. Sliding plate; 51. Air outlet hole; 52. Slider; 6. Drive component; 61. Electric push rod; 62. Adjustment rod; 63. Adjustment frame; 64. Plastic telescopic tube; 7. Adjustment column; 71. Short column; 72. Medium-short column; 73. Medium column; 74. Long column. Detailed Implementation

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a fresh air volume control device for a micro-positive pressure ventilation system includes an adjustment box 1, an air inlet pipe 2 and an air outlet pipe 3 connecting the left and right ends of the adjustment box 1, a fixed plate 4 fixed inside the adjustment box 1, a sliding plate 5 facing the fixed plate 4, and a driving component 6 for driving the sliding plate 5 to move closer to or away from the fixed plate 4. The fixed plate 4 and the sliding plate 5 divide the interior of the adjustment box 1 into an air inlet chamber 11, an adjustment chamber 12, and an air outlet chamber 13 from left to right. The fixed plate 4 is provided with a plurality of air inlet holes 41 connecting the air inlet chamber 11 and the adjustment chamber 12. A plurality of adjustment columns 7 of different lengths are provided on one side of the fixed plate 4. The air inlet holes 41 are staggered from the adjustment columns 7. The sliding plate 5 is provided with an air outlet hole 51 facing the adjustment columns 7. The air outlet hole 51 connects the adjustment chamber 12 and the air outlet chamber 13. The air inlet pipe 2 connects to the air inlet chamber 11, and the air outlet pipe 3 connects to the air outlet chamber 13.

[0018] The regulating box 1 is installed on the exhaust pipe of the micro-positive pressure ventilation system through the air inlet pipe 2 and the air outlet pipe 3. In use, the air blown by the centrifugal fan passes through the air inlet pipe 2, the air inlet chamber 11, the air inlet hole 41, the regulating chamber 12, the air outlet hole 51, the air outlet chamber 13, and the air outlet pipe 3 in sequence. Due to the different lengths of the multiple regulating columns 7, as the driving component 6 drives the sliding plate 5 closer to the fixed plate 4, more and more regulating columns 7 are gradually inserted into the air outlet hole 51, and the air volume that can pass through the air outlet hole 51 decreases. Conversely, as the driving component 6 drives the sliding plate 5 away from the fixed plate 4, the number of regulating columns 7 inserted into the air outlet hole 51 decreases, and the air volume that can pass through the air outlet hole 51 increases. This utility model eliminates the need for frequent adjustment of the centrifugal fan, ensuring the service life of the centrifugal fan, and can also quickly adjust the exhaust volume of the fume hood, making it more practical.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the adjusting column 7 includes a short column 71 fixed at one end to the fixed plate 4, multiple medium-short columns 72 arranged in a ring around the axis of the short column 71, multiple medium columns 73 arranged in a ring around the axis of the short column 71, and multiple long columns 74 arranged in a ring around the axis of the short column 71. In this embodiment, the lengths of the short column 71, medium-short column 72, medium column 73, and long column 74 gradually increase, giving the adjusting box 1 five adjusting positions. When the sliding plate 5 moves away from the fixed plate 4, When the short column 71, medium-short column 72, medium column 73, and long column 74 are not connected to the air outlet 51, the airflow through the regulating box 1 is at its maximum. When the sliding plate 5 is close to the fixed plate 4 until the medium-short column 72, medium column 73, and long column 74 are connected to the air outlet 51, the airflow through the regulating box 1 is at its minimum. When the sliding plate 5 is closest to the fixed plate 4, and the short column 71, medium-short column 72, medium column 73, and long column 74 are connected to the air outlet 51, the airflow through the regulating box 1 is closed.

[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, at least four short columns 72, medium columns 73 and long columns 74 are provided. In this embodiment, the airflow force on the sliding plate 5 can be more uniform by using at least four short columns 72, at least four medium columns 73, and at least four long columns 74 in a ring array.

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the inner wall of the regulating box 1 is provided with multiple sliding grooves 14, and a slider 52 is slidably connected in the sliding groove 14. One end of the slider 52 is fixedly connected to the sliding plate 5. In this embodiment, the slider 52 guides the sliding plate 5 by sliding along the sliding groove 14, so that the regulating column 7 can be more accurately inserted into the air outlet 51.

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the driving component 6 includes an electric push rod 61 fixed to one end of the regulating box 1, a control button electrically connected to the electric push rod 61, the piston rod head of the electric push rod 61 extending into the regulating box 1 and driving the regulating rod 62, and an regulating frame 63 fixed to the end of the regulating rod 62. The regulating rod 62 and the piston rod head of the electric push rod 61 are coaxially arranged, and a plastic telescopic tube 64 is sleeved on the regulating rod 62. The two ends of the plastic telescopic tube 64 are sealed and connected to the regulating frame 63 and the inner end of the regulating box 1. The regulating frame 63 is fixedly connected to the sliding plate 5. In this embodiment, the electric push rod 61 can be controlled by the control button. The electric push rod 61 drives the regulating rod 62 to drive the regulating frame 63, so that the sliding plate 5 moves closer to or away from the fixed plate 4 in the regulating box 1. The two ends of the plastic telescopic tube 64 are sealed and connected to the sliding plate 5 and the regulating box 1, which can prevent air leakage from the air outlet cavity 13.

[0023] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the scope defined by this utility model.

Claims

1. A fresh air volume control device for a micro-positive pressure ventilation system, characterized in that: The device includes an adjustment box, an air inlet pipe and an air outlet pipe connecting the left and right ends of the adjustment box, a fixed plate fixed inside the adjustment box, a sliding plate opposite to the fixed plate, and a driving component for driving the sliding plate closer to or further away from the fixed plate. The fixed plate and the sliding plate divide the interior of the adjustment box into an air inlet chamber, an adjustment chamber, and an air outlet chamber from left to right. The fixed plate has multiple air inlet holes connecting the air inlet chamber and the adjustment chamber. One side of the fixed plate has multiple adjustment columns of different lengths. The air inlet holes are staggered from the adjustment columns. The sliding plate has an air outlet hole opposite to the adjustment columns. The air outlet hole connects the adjustment chamber and the air outlet chamber. The air inlet pipe connects to the air inlet chamber, and the air outlet pipe connects to the air outlet chamber.

2. The fresh air volume control device for a micro-positive pressure ventilation system according to claim 1, characterized in that, The adjusting column includes a short column with one end fixed to a fixed plate, multiple medium and short columns arranged in a ring around the axis of the short column, multiple medium columns arranged in a ring around the axis of the short column, and multiple long columns arranged in a ring around the axis of the short column.

3. The fresh air volume control device for a micro-positive pressure ventilation system according to claim 2, characterized in that, The short, medium, and long columns are each provided with at least four columns.

4. The fresh air volume control device for a micro-positive pressure ventilation system according to claim 1, characterized in that, The inner wall of the regulating box is provided with multiple sliding grooves, and a slider is slidably connected in the sliding grooves. One end of the slider is fixedly connected to a sliding plate.

5. The fresh air volume control device for a micro-positive pressure ventilation system according to claim 1, characterized in that, The driving component includes an electric push rod fixed to one end of the adjustment box, a control button electrically connected to the electric push rod, the piston rod head of the electric push rod extending into the adjustment box and driving an adjustment rod, an adjustment frame fixed to the end of the adjustment rod, the adjustment rod being coaxially arranged with the piston rod head of the electric push rod, and a plastic telescopic tube being sleeved on the adjustment rod, the two ends of the plastic telescopic tube being sealed and connected to the inner end of the adjustment frame and the adjustment box, and the adjustment frame being fixedly connected to a sliding plate.

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