Self-supplementing fume hood and energy-saving ventilation system

Abstract

The application provides a self-supplement air type fume hood and an energy-saving ventilation system, wherein the fume hood comprises a cabinet body, an air supplement assembly and a wind guide structure; the cabinet body has a wind collecting cavity which is open to the front face thereof, and the inner side of the wind collecting cavity has an exhaust passage which is communicated with a negative pressure generating assembly; the air supplement assembly is communicated with the wind collecting cavity, and is used for extracting outdoor air and discharging the outdoor air to the wind collecting cavity; the wind guide structure is arranged in the wind collecting cavity, and is used for making the outdoor air discharged by the air supplement assembly and indoor air enter the exhaust passage together, so that on one hand, the exhaust amount of indoor air can be reduced under the premise of ensuring the normal discharge of indoor pollutants; and on the other hand, since the indoor air is discharged under the joint action of the negative pressure generating assembly and the outdoor air, the vortex of indoor air in the wind collecting cavity can be avoided. The self-supplement air type fume hood and the energy-saving ventilation system provided by the application can reduce the loss of indoor air while ensuring the discharge effect of indoor pollutants, and realize the technical purpose of energy-saving ventilation.

Description

Technical Field

[0001] This application belongs to the field of laboratory ventilation technology, specifically relating to a self-replenishing fume hood and an energy-saving ventilation system. Background Technology

[0002] Laboratory ventilation systems are the cornerstone of ensuring the safe and reliable operation of the research environment. Their core function is to effectively remove pollutants such as harmful aerosols and chemical vapors generated during experiments, so as to prevent personnel exposure, protect instruments and equipment, and maintain indoor cleanliness.

[0003] To achieve this goal, existing technologies generally use fume hoods as the core device for local ventilation. Their traditional working principle relies on the negative pressure generated by the building's central exhaust system to capture and expel pollutants generated in the operating area.

[0004] The inventors discovered that the design of existing fume hoods has several inherent drawbacks: First, their performance is highly dependent on the stability of the central exhaust system, and continuous large-volume exhaust means that the indoor air that has been treated for temperature and humidity is directly discharged to the outside, resulting in huge energy waste and high operating costs; Second, the indoor air enters the cabinet under negative pressure, and its exhaust efficiency is difficult to keep in line with the intake efficiency, which will generate eddies, causing the gas exhaust direction to change, and it will not be able to enter the exhaust channel and will overflow back into the room. Utility Model Content

[0005] This application provides a self-replenishing fume hood and an energy-saving ventilation system, which aims to ensure the effective removal of indoor pollutants while reducing indoor air loss.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A self-replenishing fume hood is provided, comprising: The cabinet has an air collection chamber that is open to the front; the air collection chamber has an exhaust channel inside, and the exhaust channel is connected to a negative pressure generating component; An air supply assembly, connected to the air collection chamber, is used to draw in outdoor air and discharge it into the air collection chamber; and An air guide structure is installed inside the air collection chamber to direct the outdoor gas entering the air collection chamber toward the exhaust duct, so that the outdoor gas and indoor gas are introduced into the exhaust duct together, and the indoor gas is discharged under the combined action of the negative pressure generating component and the outdoor gas.

[0007] In one possible implementation, the air collection chamber has a partition extending in the vertical direction; the partition is positioned facing the opening of the cabinet, and its surface has multiple ventilation holes; The upper surface of the cabinet is provided with an exhaust port that communicates with the air collection chamber. The exhaust port is located on the side of the partition facing away from the open part of the cabinet and is connected to the negative pressure generating component. The side of the partition facing away from the open cabinet and the inner wall of the air collection chamber form the exhaust channel; gas can enter the exhaust channel through the vent and be discharged from the exhaust port.

[0008] In one possible implementation, the partition has multiple partitions; the multiple partitions are arranged side by side in the vertical direction, and adjacent partitions are connected. At least one of the partitions is located above the cabinet opening, and the partition located above the cabinet opening is inclined towards the cabinet opening from bottom to top.

[0009] In one possible implementation, an air intake is provided on the upper surface of the cabinet; the air intake is located on the side of the exhaust duct facing the open end of the cabinet and is connected to the air intake assembly to allow outdoor air to be exhausted; the air intake is also connected to the air guide structure to allow the incoming outdoor air to be exhausted into the air collection chamber.

[0010] In one possible implementation, the air supply component includes: The make-up air fan has its inlet located outdoors or connected to an air supply pipe extending outdoors for outdoor air to be discharged; the outlet of the make-up air fan is connected to the make-up air inlet.

[0011] In one possible implementation, the air guiding structure includes: The first air duct is located at the back of the cabinet, and its upper end is connected to the air intake to allow outdoor air to be discharged under the action of the air supply fan; and The second air duct is located on the lower side of the air collection chamber. One end of the second air duct is connected to the lower end of the first air duct, and the other end extends toward the front of the cabinet and has an air outlet toward the exhaust channel.

[0012] In one possible implementation, the air supply component further includes: A static compressor is installed inside the second air duct, with its outlet end connected to the air outlet, so that the gas discharge direction in the second air duct is parallel to the direction of the air outlet.

[0013] In one possible implementation, the air guiding structure includes: An air duct is formed on the inner wall of the front of the cabinet; one end of the air duct is connected to the air inlet to allow outdoor air to be discharged under the action of the air supply fan; the other end of the air duct is located on the upper side of the cabinet opening and is connected to the air collection chamber and is oriented towards the exhaust duct.

[0014] In one possible implementation, the air supply component further includes: Multiple flow dividers are spaced apart in the air collection cavity along the vertical direction, and an airflow channel is formed between adjacent flow dividers; one end of the airflow channel is connected to the air guide channel, and the other end is connected to the exhaust channel. The multiple airflow channels work together to divide the gas discharged from the air guide channel into multiple airflows and enter the exhaust channel; and each of the diversion plates has multiple vents to allow indoor gas to pass through, or to allow gas in adjacent airflow channels to pass through.

[0015] In this embodiment, the function of the air collection chamber is to collect indoor air and allow relevant pollutants to enter and ultimately be discharged. Specifically, under the action of the negative pressure generating component, a stable negative pressure environment is presented in the exhaust duct, thereby providing suction to the room so that indoor air carries pollutants into the air collection chamber. Simultaneously, the air supply component discharges outdoor air into the air collection chamber. The outdoor air entering the air collection chamber can change its direction under the action of the air guiding structure and ultimately enters the exhaust duct along with the indoor air. In this process, the outdoor air, on the one hand, occupies the gas space in the exhaust duct, thereby reducing the amount of indoor air discharged without affecting the discharge of pollutants; on the other hand, the outdoor air also provides thrust for the indoor air to be discharged into the exhaust duct, preventing eddies and other situations that could cause indoor air to overflow back into the indoor environment, thus improving the stability of this fume hood in use.

[0016] The self-replenishing air fume hood provided in this embodiment, compared with the prior art, can reduce indoor air loss while ensuring the effective removal of indoor pollutants, thus achieving the technical objective of energy-saving ventilation.

[0017] The technical solution adopted in this application also provides an energy-saving ventilation system, including the self-replenishing air fume hood proposed in any of the preceding claims.

[0018] The beneficial effects of the energy-saving ventilation system provided in this embodiment are the same as those of the aforementioned self-replenishing air fume hood, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1A three-dimensional structural diagram of the make-up air fume hood provided in the embodiments of this application; Figure 2 One of the cross-sectional structural schematic diagrams of the make-up air fume hood provided in the embodiments of this application; Figure 3 This is a three-dimensional structural diagram of the partition used in the embodiments of this application in its combined state; Figure 4 This is one of the three-dimensional structural diagrams of the first and second air guide pipes used in the embodiments of this application in a combined state; Figure 5 This is a second three-dimensional structural diagram of the first and second air ducts used in the embodiments of this application in a combined state; Figure 6 A second cross-sectional structural schematic diagram of the make-up air fume hood provided in the embodiments of this application; Figure 7 This is a three-dimensional structural diagram of the diverter plate used in the embodiments of this application in a combined state; Explanation of reference numerals in the attached drawings: 1. Cabinet; 11. Air collection chamber; 12. Exhaust duct; 13. Exhaust outlet; 14. Make-up air outlet; 2. Partition; 21. Vent hole; 3. Make-up air fan; 4. Static compressor; 5. Diverter plate; 51. Vent hole; 10. First air guide pipe; 20. Second air guide pipe; 201. Air supply outlet; 30. Air guide duct. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 7 The self-supplied air fume hood provided in this application will now be described. The self-supplied air fume hood proposed in this application includes a cabinet body 1, an air supply component, and an air guiding structure.

[0026] Cabinet 1 is usually located on the side of the laboratory; it should be noted that a single laboratory is usually equipped with multiple cabinets 1, that is, multiple fume hoods are equipped to operate simultaneously to achieve the exhaust of harmful gases from different areas of the laboratory.

[0027] The cabinet 1 has an air collection chamber 11 inside, and the air collection chamber 11 is open to the front of the cabinet 1; that is, the front of the cabinet 1 has an opening that communicates with the air collection chamber 11.

[0028] The air collection chamber 11 has an exhaust channel 12 inside, and this exhaust channel 12 is connected to a negative pressure generating component. Specifically, the exhaust channel 12 is located inside the air collection chamber 11, near the back of the cabinet 1. Its function is to collect the gas entering the air collection chamber 11 and exhaust the gas outward. The principle of gas collection is achieved by using a negative pressure generating component, which is a vacuum pump. This component can exhaust the gas in the exhaust channel 12 in a constant amount per unit time, so that the exhaust channel 12 is in a negative pressure environment, thereby allowing the gas in the air collection chamber 11 to be quickly discharged.

[0029] The make-up air assembly is connected to the air collection chamber 11 and is used to draw in outdoor air and discharge it into the air collection chamber 11. In special cases, the air drawn in by the make-up air assembly can also be indoor air, that is, ordinary indoor air that has not been treated for temperature and humidity. Similar to outdoor air, the use of this type of ordinary air will not affect the indoor air emission rate.

[0030] The air guide structure is set in the air collection chamber 11 so that the outdoor air discharged into the air collection chamber 11 through the air supply component is discharged towards the exhaust duct 12. During this discharge process, the outdoor air and the indoor air are discharged together into the exhaust duct 12, and the indoor air is discharged under the combined action of the negative pressure generating component and the outdoor air, thus reducing the working pressure of the negative pressure generating component.

[0031] In this embodiment, the function of the air collection chamber 11 is to collect indoor air and allow relevant pollutants to enter and ultimately be discharged. Specifically, under the action of the negative pressure generating component, a stable negative pressure environment is presented in the exhaust duct 12, thereby providing suction to the room so that the indoor air carries pollutants into the air collection chamber 11. Simultaneously with the indoor air entering the air collection chamber 11, the air supply component discharges outdoor air into the air collection chamber 11. The outdoor air entering the air collection chamber 11 can change its direction under the action of the air guiding structure and ultimately enter the exhaust duct 12 along with the indoor air. In this process, the outdoor air, on the one hand, occupies the gas space in the exhaust duct 12, thereby reducing the amount of indoor air discharged without affecting the discharge of pollutants; on the other hand, the outdoor air also provides thrust for the indoor air to be discharged into the exhaust duct 12, preventing eddies and other situations that could cause indoor air to overflow back into the indoor environment, thus improving the stability of this fume hood in use.

[0032] The self-replenishing air fume hood provided in this embodiment, compared with the prior art, can reduce indoor air loss while ensuring the effective removal of indoor pollutants, thus achieving the technical objective of energy-saving ventilation.

[0033] In some embodiments, such as Figure 2 and Figure 3 As shown, the air collection chamber 11 has a partition 2 extending in the vertical direction; the partition 2 is set with an opening facing the cabinet 1, and its surface has a plurality of ventilation holes 21 extending in the thickness direction.

[0034] The upper surface of the cabinet 1 is provided with an exhaust port 13 that communicates with the air collection chamber 11. The exhaust port 13 is located on the side of the partition 2 facing away from the open opening of the cabinet 1 and is connected to the negative pressure generating component.

[0035] Among them, the side of the partition 2 facing away from the open opening of the cabinet 1 and the inner wall of the air collection chamber 11 form an exhaust channel 12; based on this, in actual operation, the gas in the air collection chamber 11 can enter the exhaust channel 12 through the vent 21 and be discharged from the exhaust port 13.

[0036] In some embodiments, such as Figure 2 and Figure 3 As shown, partition 2 has multiple partitions.

[0037] Multiple partitions 2 are arranged side by side in the vertical direction; adjacent partitions 2 are connected, and each partition 2 abuts against the inner wall of the air collection chamber 11.

[0038] At least one partition 2 is located above the opening of the cabinet 1, and the partition 2 located above the opening of the cabinet 1 is inclined from bottom to top toward the opening of the cabinet 1, so that the partition 2 forms a structure that is wider at the bottom and narrower at the top on the other side away from the exhaust duct 12.

[0039] Since the gas typically flows horizontally after entering through the opening of cabinet 1, eddies tend to occur in the narrow zone, i.e., the upper half, of this structure. Therefore, the air guide structure can be designed specifically for the gas in the upper half, reducing the design complexity of the air guide path and improving the reliability of the device during operation.

[0040] In some embodiments, such as Figure 2 and Figure 6 As shown, an air supply vent 14 is provided on the upper surface of cabinet 1.

[0041] The air intake vent 14 is located on the side of the exhaust duct 12 facing the open side of the cabinet 1, that is, on the side closer to the open side of the cabinet 1 than the aforementioned exhaust vent 13. The air intake vent 14 is connected to the aforementioned air intake assembly to allow outdoor air to be exhausted. In addition, the air intake vent 14 is also connected to the air guide structure to allow the incoming outdoor air to be exhausted into the air collection chamber 11.

[0042] In some embodiments, such as Figure 2 and Figure 6 As shown, the make-up air assembly includes a make-up air fan 3.

[0043] The inlet of the make-up air fan 3 is located outdoors, or is connected to an air supply pipe extending outdoors to allow outdoor air to be discharged; in special cases, the air supply pipe is located indoors and far away from the area where the temperature and humidity regulated air is located. The outlet of the make-up air fan 3 is connected to the make-up air inlet 14 to allow air to enter.

[0044] It should be noted that the operating principle of the air supply fan 3 is to actively send fresh air into the air supply port 14 through mechanical power to prevent local negative pressure from forming in the air collection chamber 11 and generating eddies.

[0045] In some embodiments, such as Figure 2 , Figure 4 and Figure 5 As shown, the air guiding structure includes a first air guiding pipe 10 and a second air guiding pipe 20.

[0046] The first air duct 10 is located on the back of the cabinet 1, that is, on the outside of the cabinet 1; in special cases, it can also be a cavity opened inside the back panel of the cabinet 1, which cooperates with the inner peripheral wall of the back panel to form the first air duct 10. The upper end of the first air duct 10 is connected to the air supply port 14 so that outdoor air can be discharged under the action of the air supply fan 3.

[0047] The second air duct 20 is located on the lower side of the air collection chamber 11. One end of it is connected to the lower end of the first air duct 10, and the other end extends toward the front of the cabinet 1 and has an air outlet 201 facing the exhaust channel 12.

[0048] By using the above-mentioned technical solutions, the first air duct 10 and the second air duct 20 work together to adjust the direction of the gas discharged by the make-up air fan 3 multiple times, so that the gas is discharged into the air collection chamber 11 through the air outlet 201. Based on this structure, by setting the orientation of the air outlet 201, the direction of the make-up airflow can be ensured, thereby achieving the fundamental technical purpose of this device, namely, reducing indoor air loss through make-up air and ensuring the delivery of indoor gas to the exhaust duct 12.

[0049] In some embodiments, such as Figure 4 As shown, the make-up air assembly also includes a static compressor 4.

[0050] The static compressor 4 is installed inside the second air duct 20, and its outlet end is connected to the air outlet 201 so that the gas discharge direction in the second air duct 20 is parallel to the direction of the air outlet 201.

[0051] The static compressor 4 serves to stabilize airflow, reduce wind speed, and balance system pressure, thereby reducing dynamic pressure, increasing static pressure, and achieving air distribution and mixing. Here, the static compressor 4 ensures that the gas entering the air supply vent 201 has a certain degree of propagation, thus "pushing" the indoor air entering the air collection chamber 11 into the exhaust duct 12.

[0052] In some embodiments, such as Figure 6 As shown, the air guiding structure includes an air guiding channel 30.

[0053] The air duct 30 is located on the inner wall of the front of the cabinet 1; one end of the air duct 30 is connected to the air supply port 14 so that outdoor air can be discharged under the action of the air supply fan 3; the other end of the air duct 30 is located on the upper side of the opening of the cabinet 1, and is connected to the air collection chamber 11 and is set towards the exhaust duct 12.

[0054] like Figure 6 As shown, the gas discharged through the air guide duct 30 will be transported to the area where eddies are likely to occur, and the indoor gas that would have caused eddies will be dispersed and discharged back into the exhaust duct 12 to prevent the gas from overflowing back to the outside.

[0055] In some embodiments, such as Figure 6 and Figure 7 As shown, the make-up air assembly also includes multiple splitter plates 5.

[0056] Multiple diverter plates 5 are disposed within the air collection chamber 11 and are arranged at intervals along the vertical direction. After assembly, the end of each diverter plate 5 abuts against the aforementioned partition plate 2, and the plate surface orientation is perpendicular to the plate surface orientation of the partition plate 2. An airflow channel is formed between adjacent diverter plates 5, one end of which is connected to the air guide channel 30 and the other end is connected to the exhaust channel 12, so as to realize the gas delivery from the air guide channel 30 to the exhaust channel 12.

[0057] Through the combined action of multiple airflow channels, the gas discharged from the air guide channel 30 can be divided into multiple airflows and enter the exhaust channel 12; and each diverter plate 5 has multiple vents 51 to allow indoor gas to pass through, or to allow gas in adjacent airflow channels to pass through, forming a local negative pressure environment, ensuring that indoor gas can be stably delivered into the exhaust channel 12, and avoiding eddies in the air collection chamber 11.

[0058] Based on the same inventive concept, embodiments of this application also provide an energy-saving ventilation system, including the self-replenishing air fume hood proposed in any of the preceding claims.

[0059] The beneficial effects of the energy-saving ventilation system provided in this embodiment are the same as those of the aforementioned self-replenishing air fume hood, and will not be repeated here.

[0060] The above content is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A self-contained air fume hood, characterized in that, include: The cabinet has an air collection chamber that opens to its front; The air collection chamber has an exhaust channel inside, and the exhaust channel is connected to a negative pressure generating component. The air supply component is connected to the air collection chamber and is used to draw in outdoor air and discharge it into the air collection chamber. as well as An air guide structure is installed inside the air collection chamber to direct the outdoor gas entering the air collection chamber toward the exhaust duct, so that the outdoor gas and indoor gas are introduced into the exhaust duct together, and the indoor gas is discharged under the combined action of the negative pressure generating component and the outdoor gas.

2. The self-supplied air fume hood as described in claim 1, characterized in that, The air collection chamber has a partition extending in the vertical direction; the partition is set towards the opening of the cabinet, and its surface has multiple ventilation holes; The upper surface of the cabinet is provided with an exhaust port that communicates with the air collection chamber. The exhaust port is located on the side of the partition facing away from the open part of the cabinet and is connected to the negative pressure generating component. The side of the partition facing away from the open cabinet and the inner wall of the air collection chamber form the exhaust channel; gas can enter the exhaust channel through the vent and be discharged from the exhaust port.

3. The self-supplied air fume hood as described in claim 2, characterized in that, The partition has multiple partitions; the multiple partitions are arranged side by side in the vertical direction, and adjacent partitions are connected. At least one of the partitions is located above the cabinet opening, and the partition located above the cabinet opening is inclined towards the cabinet opening from bottom to top.

4. The self-contained air fume hood as described in any one of claims 1-3, characterized in that, An air inlet is provided on the upper surface of the cabinet; the air inlet is located on the side of the exhaust duct facing the open end of the cabinet and is connected to the air inlet assembly to allow outdoor air to be discharged; the air inlet is also connected to the air guide structure to allow the incoming outdoor air to be discharged into the air collection chamber.

5. The self-replenishing air fume hood as described in claim 4, characterized in that, The air supply component includes: The make-up air fan has its inlet located outdoors or connected to an air supply pipe extending outdoors for outdoor air to be discharged; the outlet of the make-up air fan is connected to the make-up air inlet.

6. The self-replenishing air fume hood as described in claim 5, characterized in that, The air guiding structure includes: The first air duct is located at the back of the cabinet, and its upper end is connected to the air intake to allow outdoor air to be discharged under the action of the air supply fan; and The second air duct is located on the lower side of the air collection chamber. One end of the second air duct is connected to the lower end of the first air duct, and the other end extends toward the front of the cabinet and has an air outlet toward the exhaust channel.

7. The self-replenishing air fume hood as described in claim 6, characterized in that, The air supply component also includes: A static compressor is installed inside the second air duct, with its outlet end connected to the air outlet, so that the gas discharge direction in the second air duct is parallel to the direction of the air outlet.

8. The self-replenishing air fume hood as described in claim 5, characterized in that, The air guiding structure includes: An air duct is formed on the inner wall of the front of the cabinet; one end of the air duct is connected to the air inlet to allow outdoor air to be discharged under the action of the air supply fan; the other end of the air duct is located on the upper side of the cabinet opening and is connected to the air collection chamber and is oriented towards the exhaust duct.

9. The self-supplied air fume hood as described in claim 8, characterized in that, The air supply component also includes: Multiple flow dividers are spaced apart in the air collection cavity along the vertical direction, and an airflow channel is formed between adjacent flow dividers; one end of the airflow channel is connected to the air guide channel, and the other end is connected to the exhaust channel. The multiple airflow channels work together to divide the gas discharged from the air guide channel into multiple airflows and enter the exhaust channel; and each of the diversion plates has multiple vents to allow indoor gas to pass through, or to allow gas in adjacent airflow channels to pass through.

10. An energy-saving ventilation system, characterized in that, Includes the self-supplementing fume hood as described in any one of claims 1-9.

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