An energy-saving purification fume hood

Abstract

The present invention belongs to the technical field of air purification, and in particular relates to an energy-saving purification fume hood, including: a cabinet body, a purification chamber is provided inside the cabinet body, a filter screen is slidably connected to the inner wall of the purification chamber in the vertical direction, and an exhaust port communicating with the outside is provided on the inner wall of the purification chamber; a flow guiding mechanism for improving the contact effect between air and the filter screen, and the flow guiding mechanism includes a pretreatment chamber provided inside the cabinet body. By setting the flow guiding mechanism and the pretreatment mechanism, when the air enters the purification chamber arranged in an inverted T shape, it is guided and gathered above the filter screen, increasing the contact time between the air and the filter screen when passing through the filter screen. At the same time, the spiral rod is driven to rotate by the rotating rod, and the relatively large particles are pushed towards the inner wall of the pretreatment chamber by centrifugal force, removing the relatively large particles in the air in advance during purification, improving the filtration efficiency and prolonging the service life of the filter screen.

Description

Technical Field

[0001] The present invention belongs to the technical field of air purification, and particularly relates to an energy-saving purification fume hood. Background Art

[0002] An energy-saving purification fume hood is a ventilation device specifically used in places such as laboratories. It aims to effectively purify harmful gases while reducing energy consumption through optimized design and technical means. It is usually equipped with an efficient air filtration system and an adjustable air flow control system to provide a safe and comfortable working environment while reducing energy consumption.

[0003] Existing purification fume hoods, such as an energy-saving air purification fume hood disclosed in Chinese Patent Publication No. CN217043919U, still have the following technical problems during use:

[0004] During the process of purifying air, it is impossible to ensure the contact time between the air and the filter screen, resulting in a relatively limited filtering effect of the filter screen on the air. At the same time, it is impossible to remove relatively large particles in the air in advance, resulting in these large particles being prone to clogging the filter screen, reducing the air purification effect and significantly shortening the service life of the filter screen;

[0005] During the process of purifying air, due to improper design of the filter screen aperture, some relatively small particles in the air are too small to be effectively captured, and there is a situation where the particles in the air "slip through" the filter screen, resulting in the filter screen being unable to effectively capture the particles in the air and further reducing the air purification effect. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems raised in the above background art, and provide an energy-saving purification fume hood that can increase the contact time between air and the filter screen when passing through the filter screen, and at the same time remove relatively large particles in the air before purification.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An energy-saving purification fume hood, comprising:

[0009] A cabinet body, a purification chamber is provided inside the cabinet body, a filter screen is slidably connected to the inner wall of the purification chamber in the vertical direction, and an exhaust port communicating with the outside is provided on the inner wall of the purification chamber;

[0010] A flow guiding mechanism for improving the contact effect between air and the filter screen. The flow guiding mechanism includes a pretreatment chamber provided inside the cabinet body. The space above the filter screen in the purification chamber is arranged in an inverted T shape, and an air delivery channel is communicated between the pretreatment chamber and the purification chamber;

[0011] A pretreatment mechanism for removing relatively large particles in the air in advance. The pretreatment mechanism includes a rotating rod rotatably connected inside the pretreatment chamber. A screw rod is fixedly connected to the rotating rod. A storage chamber is provided in the cabinet at a position below the pretreatment chamber. A driving motor is provided inside the cabinet. The bottom end of the rotating rod passes through the bottom wall of the storage chamber and is fixedly connected to the output shaft of the driving motor.

[0012] Preferably, an air pipe is fixedly communicated with the inner wall of the pretreatment chamber, and the other end of the air pipe is communicated with an air pump.

[0013] Preferably, a discharge port is communicated between the inside of the storage chamber and the outside of the cabinet.

[0014] Preferably, an air flow extrusion mechanism is provided inside the cabinet for periodically changing the flow state of the air flow to improve the capture probability of particles in the air by the filter net. The air flow extrusion mechanism includes a transmission rod rotatably connected inside the cabinet. A cam is fixedly connected to the transmission rod, and a rotation groove for the cam to rotate is provided inside the cabinet. A support plate is fixedly connected inside the purification chamber. A lifting frame is provided at a position below the support plate inside the purification chamber. Two connecting rods are fixedly connected between the lifting frame and the filter net, and the connecting rods penetrate and are slidably connected to the support plate. A limiting groove is provided on the side wall of the purification chamber. A limiting block is fixedly connected to the lifting frame and is slidably connected to the inner wall of the limiting groove in the vertical direction. The cam periodically abuts against and pushes the limiting block to move downward. Two first springs are provided between the lifting frame and the bottom wall of the purification chamber.

[0015] Preferably, a transmission mechanism is further provided inside the cabinet for driving the air flow extrusion mechanism to work synchronously during the operation of the rotating rod. The transmission mechanism includes a bevel gear fixedly connected to the transmission rod, and a first bevel gear ring meshing with the bevel gear is fixedly connected to the rotating rod.

[0016] Preferably, an adjusting mechanism is provided inside the purification chamber for adaptively adjusting the position of the filter net according to the air flow rate. The adjusting mechanism includes a rotating cylinder rotatably connected through the filter net. Axial flow fan blades are provided on the rotating cylinder. Two symmetrically arranged sliding grooves are provided at the upper end of the lifting frame. A moving block is slidably connected in the sliding grooves. A triangular guiding plate is fixedly connected to the moving block. Two symmetrically arranged guiding rollers are rotatably connected inside the purification chamber. The guiding rollers are in contact with and roll on the triangular guiding plate at the corresponding position. A hydraulic mechanism is provided between the rotating cylinder and the moving block for automatically adjusting the position of the triangular guiding plate according to the air flow rate.

[0017] Preferably, the hydraulic mechanism includes a control block fixedly connected to the top of the rotating cylinder. An annular liquid storage cavity is formed inside the control block. A diversion cavity communicating with the inside of the rotating cylinder is formed at the bottom of the annular liquid storage cavity. A plurality of centrifugal grooves are formed on the inner wall of the annular liquid storage cavity and are distributed in a circumferential array. A piston plate is hermetically and slidably connected inside the centrifugal groove. A second spring is arranged between the piston plate and the inner wall of the centrifugal groove. A hollow block is fixedly connected to the inner bottom wall of the purification cavity through a support column. The upper end of the hollow block is fixedly connected with a sealing sleeve hermetically connected to the rotating cylinder, and the inside of the rotating cylinder communicates with the inside of the hollow block. Control grooves are formed on both inner walls of the lifting frame. Liquid infusion hoses communicate between the control grooves and the inside of the hollow block. A piston block is hermetically and slidably connected inside the control groove. A push rod is fixedly connected between the moving block and the piston block at the corresponding position. A liquid storage space is formed among the centrifugal groove, the annular liquid storage cavity, the diversion cavity, the rotating cylinder, the sealing sleeve, the hollow block, the liquid infusion hose, and the control groove, and the liquid storage space is filled with hydraulic oil.

[0018] Preferably, a plurality of stirring rods distributed in a circumferential array are rotatably connected to the position of the rotating cylinder above the filter screen. A plurality of groups of stirring plates are fixedly connected to the stirring rods. A second bevel gear ring is fixedly connected to the filter screen. A third bevel gear ring meshing with the second bevel gear is fixedly connected to the stirring rod.

[0019] Compared with the existing technology, the advantages of this energy-saving purification fume hood are as follows:

[0020] 1. By setting the diversion mechanism and the pretreatment mechanism, when purifying air, the air is guided and gathered above the filter screen when entering the purification cavity arranged in an inverted T shape, improving the contact time between the air and the filter screen when passing through the filter screen. During the process of the air passing through the pretreatment cavity, the spiral rod is driven to rotate by the rotating rod, causing the air to rotate when entering the pretreatment cavity. The relatively large particles are pushed towards the inner wall of the pretreatment cavity by centrifugal force and move downward along the inner wall. The relatively large particles in the air are removed in advance during purification, so that the remaining fine particles can be more effectively captured when passing through the filter screen, improving the filtration efficiency and prolonging the service life of the filter screen.

[0021] 2. By setting the air flow extrusion mechanism, during the process of the filter screen purifying air, the cam can be driven to rotate by the transmission rod, driving the filter screen to perform reciprocating vertical displacement and vibrate, so that the filter screen can intermittently extrude the air, further changing the flow state of the air flow periodically, increasing the interaction between the particles in the air and the filter screen, reducing the situation where the particles in the air "slip over" the filter screen. At the same time, the vibrating filter screen can further prevent the filter screen from being blocked.

[0022] 3. By providing an adjustment mechanism, in the process of air entering the purification chamber, the impact force generated during air flow will drive the rotating cylinder to rotate through the axial flow fan blades, and the air flow rate when passing above the filter net will be adjusted according to the rotation speed of the rotating cylinder. When the air flow rate when entering the purification chamber is relatively large, the space between the filter net and the top wall of the purification chamber increases, thereby slowing down the air flow rate when passing through the filter net, avoiding the situation where particles cannot fully contact the filter net due to too fast air flow rate and reducing the capture efficiency. When the air flow rate when entering the purification chamber is relatively small, the space between the filter net and the top wall of the purification chamber decreases, increasing the air flow rate when passing through the filter net, and avoiding the excessive accumulation of particles on the filter net caused by the air contacting the filter net for a long time, resulting in blockage of the filter net. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0024] Figure 2 is an internal structural schematic diagram of the present invention;

[0025] Figure 3 is Figure 2 an enlarged view of part A in

[0026] Figure 4 is a partial structural schematic diagram of the rotating cylinder in the present invention;

[0027] Figure 5 is Figure 4 an enlarged view of part B in

[0028] Figure 6 is Figure 4 an enlarged view of part C in

[0029] In the figure: 1. Cabinet body; 11. Purification chamber; 12. Filter screen; 13. Exhaust port; 2. Flow guiding mechanism; 21. Pretreatment chamber; 22. Air delivery channel; 3. Pretreatment mechanism; 31. Rotating rod; 32. Screw rod; 33. Storage chamber; 34. Driving motor; 4. Air delivery pipe; 5. Air flow extrusion mechanism; 51. Transmission rod; 52. Cam; 53. Support plate; 54. Lifting frame; 55. Connecting rod; 56. Limit groove; 57. Limit block; 58. First spring; 6. Transmission mechanism; 61. Bevel gear; 62. First bevel gear ring; 7. Adjusting mechanism; 71. Rotating cylinder; 72. Axial flow fan blade; 73. Sliding groove; 74. Moving block; 75. Triangular guiding plate; 76. Guiding roller; 8. Hydraulic mechanism; 81. Control block; 82. Annular liquid storage chamber; 83. Flow guiding chamber; 84. Centrifugal groove; 85. Piston plate; 86. Second spring; 87. Hollow block; 88. Sealing sleeve; 89. Control groove; 810. Infusion hose; 811. Piston block; 812. Push rod; 9. Stirring rod; 91. Stirring plate; 92. Second bevel gear ring; 93. Third bevel gear ring. Detailed implementation manners

[0030] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0031] Embodiment: Refer to Figures 1 to 6 , an energy-saving purification fume hood, comprising:

[0032] A cabinet body 1, a purification chamber 11 is opened inside the cabinet body 1, a filter screen 12 is slidably connected to the inner wall of the purification chamber 11 along the vertical direction, and an exhaust port 13 communicating with the outside is opened on the inner wall of the purification chamber 11;

[0033] Specifically, the exhaust port 13 is located above the filter screen 12, and the filter screen 12 is a ULPA filter screen with a fiber interwoven structure, and this structure helps to more effectively capture particles during the air flowing in a predetermined direction.

[0034] A flow guiding mechanism 2, which is used to improve the contact effect between the air and the filter screen 12. The flow guiding mechanism 2 includes a pretreatment chamber 21 opened inside the cabinet body 1. The space above the filter screen 12 in the purification chamber 11 is arranged in an inverted T shape, and an air delivery channel 22 is communicated between the pretreatment chamber 21 and the purification chamber 11;

[0035] Specifically, during the air flowing from the middle of the filter screen 12 to both sides, the fibers of the filter screen 12 will have physical contact with the particles in the air, forming an effective filter layer.

[0036] The pretreatment mechanism 3 is used to remove relatively large particles in the air in advance. The pretreatment mechanism 3 includes a rotating rod 31 rotatably connected inside the pretreatment chamber 21. A spiral rod 32 is fixedly connected to the rotating rod 31. A storage chamber 33 is provided at a position below the pretreatment chamber 21 inside the cabinet 1. A driving motor 34 is provided inside the cabinet 1. The bottom end of the rotating rod 31 passes through the bottom wall of the storage chamber 33 and is fixedly connected to the output shaft of the driving motor 34.

[0037] Specifically, an air delivery pipe 4 is fixedly communicated with the inner wall of the pretreatment chamber 21. The other end of the air delivery pipe 4 is communicated with an air pump. The air pump can be used to deliver external air into the cabinet 1 and discharge the air after purification is completed, ensuring the purification effect of the air.

[0038] Specifically, a discharge port is communicated between the inside of the storage chamber 33 and the outside, which is used to remove the relatively large particles stored in the storage chamber 33.

[0039] In view of the problem in the prior art that it is impossible to ensure the contact time between the air and the filter net 12, resulting in a relatively limited filtering effect of the filter net 12 on the air, and at the same time, it is impossible to remove relatively large particles in the air in advance, resulting in these large particles being prone to clogging the filter net 12. In the present invention, by providing the diversion mechanism 2 and the pretreatment mechanism 3, during the air purification process, the air is delivered into the pretreatment chamber 21 through the air pump and the air delivery pipe 4. Through the air delivery channel 22, the air enters the purification chamber 11 arranged in an inverted T shape, so that the air is guided and gathered above the filter net 12, improving the contact time between the air and the filter net 12 when the air passes through the filter net 12. During the process of the air passing through the pretreatment chamber 21, the driving motor 34 drives the rotating rod 31 to rotate, further driving the spiral rod 32 to rotate, so that the air rotates when entering the pretreatment chamber 21. With the rotation of the air, the relatively large particulate matters are thrown to the inner wall of the pretreatment chamber 21 under the action of centrifugal force. Since the particles with greater gravity have greater inertia, the inertia of the relatively large particles is relatively large due to inertia, resulting in their continuous downward movement along the inner wall. Finally, they are settled into the inside of the storage chamber 33, removing the relatively large particles in the air before purification. The relatively small particles will not be completely pushed to the outer wall due to their relatively small inertia. They will continue to move upward with the air and enter the purification chamber 11 through the air delivery channel 22, enabling the remaining fine particles to be more effectively captured during the process of passing through the filter net 12, improving the filtering efficiency and prolonging the service life of the filter net 12.

[0040] Inside the cabinet body 1, there is an air flow extrusion mechanism 5, which is used to periodically change the flow state of the air flow to improve the capture probability of the filter screen 12 for particles in the air. The air flow extrusion mechanism 5 includes a transmission rod 51 rotatably connected inside the cabinet body 1. A cam 52 is fixedly connected to the transmission rod 51. A support plate 53 is fixedly connected inside the purification chamber 11. An elevating frame 54 is arranged at a position below the support plate 53 inside the purification chamber 11. Two connecting rods 55 are fixedly connected between the elevating frame 54 and the filter screen 12. The connecting rods 55 penetrate and are slidably connected to the support plate 53. A limiting groove 56 is formed in the side wall of the purification chamber 11. A limiting block 57 is fixedly connected to the elevating frame 54 and is slidably connected to the inner wall of the limiting groove 56 in the vertical direction. The cam 52 periodically abuts against and pushes the limiting block 57 to move downward. Two first springs 58 are arranged between the elevating frame 54 and the inner bottom wall of the purification chamber 11.

[0041] In view of the problem in the prior art that due to improper pore size design of the filter screen 12, some relatively small particles in the air cannot be effectively captured because of their too small size, and there is a situation where particles in the air "slip through" the filter screen, resulting in the filter screen 12 being unable to effectively capture particles in the air. In the present invention, by setting the air flow extrusion mechanism 5, during the process of the filter screen 12 purifying the air, the transmission rod 51 can drive the cam 52 to rotate, so that the cam 52 periodically abuts against and pushes the limiting block 57 to move downward, further enabling the elevating frame 54 to drive the filter screen 12 to move downward periodically, and reset under the elastic force of the first spring 58, causing the filter screen 12 to perform reciprocating vertical displacement and vibrate. The filter screen 12 intermittently extrudes the air above the filter screen 12. During the process of the air being extruded, the overall kinetic energy of the air and impurities increases, and at the same time, the relative movement and collision between the particles and the filter screen 12 become more intense. The fiber structure of the filter screen 12 can effectively intercept impurities when the particles move more violently due to the increase in kinetic energy. Moreover, the periodic change of the air flow makes the particles that might originally pass through the filter screen in a straight line due to inertia more likely to change their movement trajectories and come into contact with and be captured by the filter screen because of the change in the air flow direction and speed. Therefore, the situation where particles in the air "slip through" the filter screen 12 can be reduced, the particles in the air can be redirected to the surface of the filter screen 12, enhancing the purification and filtration effect of the filter screen 12 on the air. At the same time, the vibrating filter screen 12 can further prevent blockage.

[0042] It is worth mentioning that a transmission mechanism 6 is also provided inside the cabinet body 1, which is used to drive the air flow extrusion mechanism 5 to work synchronously during the operation of the rotating rod 31. The transmission mechanism 6 includes a bevel gear 61 fixedly connected to the transmission rod 51, and a first bevel gear ring 62 meshing with the bevel gear 61 is fixedly connected to the rotating rod 31. During actual use, when the driving motor 34 drives the rotating rod 31 to rotate, the transmission rod 51 will be driven to rotate synchronously through the first bevel gear ring 62 and the bevel gear 61, so that the air flow extrusion mechanism 5 and the pretreatment mechanism 3 work synchronously. While saving the driving source, the overall linkage of the device is improved, achieving the purpose of energy conservation and efficiency improvement.

[0043] An adjusting mechanism 7 is provided inside the purification chamber 11, which is used to adaptively adjust the position of the filter net 12 according to the air flow rate. The adjusting mechanism 7 includes a rotating cylinder 71 rotatably connected through the filter net 12. Axial flow fan blades 72 are provided on the rotating cylinder 71. Two sliding grooves 73 are symmetrically opened at the upper end of the lifting frame 54. A moving block 74 is slidably connected in the sliding groove 73. A triangular guiding plate 75 is fixedly connected to the moving block 74. Two symmetrically arranged guiding rollers 76 are rotatably connected inside the purification chamber 11. The guiding rollers 76 are in contact with and roll along the triangular guiding plate 75 at the corresponding position. Specifically, the guiding rollers 76 can roll along the triangular guiding plate 75 after contacting the triangular guiding plate 75. A hydraulic mechanism 8 is provided between the rotating cylinder 71 and the moving block 74, which is used to automatically adjust the position of the triangular guiding plate 75 according to the air flow rate.

[0044] The hydraulic mechanism 8 includes a control block 81 fixedly connected to the top of the rotating cylinder 71. An annular liquid storage cavity 82 is opened inside the control block 81. A diversion cavity 83 communicating with the inside of the rotating cylinder 71 is opened at the bottom of the annular liquid storage cavity 82. A plurality of centrifugal grooves 84 are arranged in a circumferential array on the inner wall of the annular liquid storage cavity 82. A piston plate 85 is hermetically slidably connected in the centrifugal groove 84. A second spring 86 is provided between the piston plate 85 and the inner wall of the centrifugal groove 84. A hollow block 87 is fixedly connected to the inner bottom wall of the purification chamber 11 through a support column. A sealing sleeve 88 hermetically connected to the rotating cylinder 71 is fixedly connected to the upper end of the hollow block 87, and the inside of the rotating cylinder 71 communicates with the inside of the hollow block 87. Control grooves 89 are opened on both inner walls of the lifting frame 54. An infusion hose 810 is communicated between the control groove 89 and the inside of the hollow block 87. A piston block 811 is hermetically slidably connected in the control groove 89. A push rod 812 is fixedly connected between the moving block 74 and the piston block 811 at the corresponding position. A liquid storage space is formed among the centrifugal groove 84, the annular liquid storage cavity 82, the diversion cavity 83, the rotating cylinder 71, the sealing sleeve 88, the hollow block 87, the infusion hose 810 and the control groove 89, and the liquid storage space is filled with hydraulic oil.

[0045] Specifically, the arrangement of the infusion hose 810 and the sealing sleeve 88 enables the lifting frame 54 and the filter net 12 to maintain a sealed connection with the sealing sleeve 88 during vertical displacement when performing lifting and lowering displacements, while the infusion hose 810 can be bent, avoiding movement interference and preventing the transportation of hydraulic oil from being affected, thereby affecting the transmission effect of the hydraulic oil.

[0046] It should also be noted that in the present invention, by providing the adjusting mechanism 7, during the process of air entering the purification chamber 11, the impact force generated by the air flow will drive the rotary drum 71 to rotate through the axial flow fan blade 72, and the flow rate of the air flowing through the filter net 12 will be adjusted according to the rotation speed of the rotary drum 71:

[0047] When the flow rate of the air entering the purification chamber 11 is relatively large, the impact force generated by the air flow will drive the rotary drum 71 to rotate at a relatively high speed, so that the centrifugal force of the piston plate 85 inside the control block 81 is relatively large. Further, the piston plate 85 overcomes the elastic force of the second spring 86, and transports the hydraulic oil in the centrifugal groove 84 to the annular liquid storage chamber 82. Further, the hydraulic oil enters the control groove 89 through the diversion chamber 83, the rotary drum 71, the hollow block 87 and the infusion hose 810, causing the piston plate 85 in the control groove 89 to slide, and driving the two piston blocks 811 to move away from each other. Further, under the action of the push rod 812, the two triangular guide plates 75 move away from each other. Since the position of the triangular guide plate 75 is restricted by the guide roller 76, when the triangular guide plates 75 move away from each other, the initial position of the lifting frame 54 and the filter net 12 when not pushed by the cam 52 will move downward, increasing the space between the filter net 12 and the top wall of the purification chamber 11. Furthermore, the flow rate of the air passing through the filter net 12 is slowed down, avoiding the situation where particles cannot fully contact the filter net 12 when the air flow rate is too fast, resulting in a reduction in the capture efficiency;

[0048] When the flow rate of the air entering the purification chamber 11 is relatively small, the impact force generated during the air flow process will drive the rotary drum 71 to rotate at a relatively low speed, so that the centrifugal force of the piston plate 85 inside the control block 81 is relatively small. The piston plate 85 can draw the hydraulic oil in the annular liquid storage chamber 82 into the centrifugal groove 84 under the elastic force of the second spring 86, thereby driving the two piston blocks 811 to move closer to each other. The initial position of the lifting frame 54 and the filter net 12 when not pushed by the cam 52 will move upward, reducing the space between the filter net 12 and the top wall of the purification chamber 11. Furthermore, the flow rate of the air passing through the filter net 12 is increased, avoiding the situation where the air contacts the filter net 12 for a long time, resulting in excessive accumulation of particles on the filter net 12 and causing the filter net to become clogged.

[0049] In addition, a plurality of stirring rods 9 distributed in a circumferential array are rotatably connected to the position of the rotary drum 71 above the filter screen 12. A plurality of groups of stirring plates 91 are fixedly connected to the stirring rods 9. A second bevel gear ring 92 is fixedly connected to the filter screen 12. A third bevel gear ring 93 meshing with the second bevel gear 61 is fixedly connected to the stirring rod 9. During the rotation of the rotary drum 71, the third bevel gear ring 93 on the stirring rod 9 will perform a circular motion along the second bevel gear ring 92, causing the stirring rod 9 to rotate during the circular motion, so that when the air flows above the filter screen 12, it will contact the filter screen 12 more fully and purify the air more thoroughly.

[0050] The functional principle of the present invention can be elaborated through the following operation methods:

[0051] During use, the external air can be conveyed into the cabinet 1 through the air pump and the air delivery pipe 4. When the air enters the pretreatment chamber 21, the driving motor 34 drives the rotating rod 31 to rotate, further driving the screw rod 32 to rotate, causing the air to rotate when entering the pretreatment chamber 21. With the rotation of the air, the centrifugal force pushes the relatively large particles towards the inner wall of the pretreatment chamber 21 and finally settles into the storage chamber 33. The relatively small particles will continue to move upward with the air due to their relatively small inertia and enter the purification chamber 11 through the air delivery channel 22. When the air enters the purification chamber 11 arranged in an inverted T shape, the air is guided and gathered above the filter screen 12 to increase the contact time between the air and the filter screen 12;

[0052] During the process of the filter screen 12 purifying the air, the rotation of the rotating rod 31 will drive the transmission rod 51 to rotate synchronously through the first bevel gear ring 62 and the bevel gear 61, and then drive the cam 52 to rotate, causing the cam 52 to periodically abut against and push the limit block 57 to move downward and reset under the elastic force of the first spring 58, enabling the filter screen 12 to perform reciprocating vertical displacement and vibrate. The filter screen 12 intermittently squeezes the air, increasing the interaction between the particles in the air and the filter screen 12 and reducing the situation where the particles in the air "slip over" the filter screen 12;

[0053] During the process of air entering the purification chamber 11, the impact force generated when the air flows will drive the rotating cylinder 71 to rotate through the axial flow fan blades 72, and the flow rate of the air flowing above the filter screen 12 will be adjusted according to the rotation speed of the rotating cylinder 71. When the flow rate of the air entering the purification chamber 11 is relatively large, the initial positions of the lifting frame 54 and the filter screen 12 when not pushed by the cam 52 will be at relatively lower displacements, making the space between the filter screen 12 and the top wall inside the purification chamber 11 relatively large, so that the flow rate of the air passing through the filter screen 12 slows down. If the flow rate of the air is relatively small, the initial positions of the lifting frame 54 and the filter screen 12 when not pushed by the cam 52 will be at relatively higher displacements, making the space between the filter screen 12 and the top wall inside the purification chamber 11 relatively small, so that the flow rate of the air passing through the filter screen 12 speeds up, ensuring that the flow rate of the air flowing above the filter screen 12 is always in a more appropriate state during purification;

[0054] After purification is completed, the air is discharged to the outside through the exhaust port 13.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An energy-saving purification fume hood, characterized in that, Comprising: A cabinet body (1), inside which a purification chamber (11) is formed. The inner wall of the purification chamber (11) is slidably connected with a filter net (12) in the vertical direction. An exhaust port (13) communicating with the outside is formed on the inner wall of the purification chamber (11); A flow guiding mechanism (2), which includes a pretreatment chamber (21) formed inside the cabinet body (1). The space above the filter net (12) in the purification chamber (11) is arranged in an inverted T shape. An air delivery channel (22) communicates between the pretreatment chamber (21) and the purification chamber (11); A pretreatment mechanism (3), which includes a rotating rod (31) rotatably arranged inside the pretreatment chamber (21). A spiral rod (32) is fixedly connected to the rotating rod (31). A storage chamber (33) is formed at a position below the pretreatment chamber (21) inside the cabinet body (1). A driving motor (34) is arranged inside the cabinet body (1). The bottom end of the rotating rod (31) passes through the bottom wall of the storage chamber (33) and is fixedly connected to the output shaft of the driving motor (34); An air flow squeezing mechanism (5) is arranged inside the cabinet body (1) for periodically changing the flow state of the air flow to improve the capture probability of the filter net (12) for particles in the air. The air flow squeezing mechanism (5) includes a transmission rod (51) rotatably connected inside the cabinet body (1). A cam (52) is fixedly connected to the transmission rod (51). A rotating groove for the cam (52) to rotate is formed inside the cabinet body (1). A support plate (53) is fixedly connected inside the purification chamber (11). A lifting frame (54) is arranged at a position below the support plate (53) inside the purification chamber (11). Two connecting rods (55) are fixedly connected between the lifting frame (54) and the filter net (12). The connecting rods (55) are slidably connected through the support plate (53). A limiting groove (56) is formed on the side wall of the purification chamber (11). A limiting block (57) is fixedly connected to the lifting frame (54) and is slidably connected to the inner wall of the limiting groove (56) in the vertical direction. The cam (52) periodically abuts against and pushes the limiting block (57) to move downward. Two first springs (58) are arranged between the lifting frame (54) and the inner bottom wall of the purification chamber (11); An adjustment mechanism (7) is provided inside the purification chamber (11) for adaptively adjusting the position of the filter screen (12) according to the air flow rate. The adjustment mechanism (7) includes a rotating cylinder (71) rotatably connected through the filter screen (12). An axial flow fan blade (72) is provided on the rotating cylinder (71). Two chutes (73) are symmetrically opened at the upper end of the lifting frame (54). A moving block (74) is slidably connected inside the chute (73). Two triangular guide plates (75) are symmetrically and fixedly connected to the two moving blocks (74). Two symmetrically arranged guide rollers (76) are rotatably connected inside the purification chamber (11). The guide roller (76) contacts and rolls with the triangular guide plate (75) at the corresponding position. A hydraulic mechanism (8) is provided between the rotating cylinder (71) and the moving block (74) for automatically adjusting the position of the triangular guide plate (75) according to the air flow rate.

2. The energy-saving purification fume hood according to claim 1, wherein, An air delivery pipe (4) is fixedly communicated with the inner wall of the pretreatment chamber (21), and the other end of the air delivery pipe (4) is communicated with an air pump.

3. The energy-saving purification fume hood according to claim 2, wherein, A discharge port is communicated between the inside of the storage chamber (33) and the outside of the cabinet body (1).

4. The energy-saving purification fume hood according to claim 1, wherein, A transmission mechanism (6) is further provided inside the cabinet body (1) for driving the air flow extrusion mechanism (5) to work synchronously during the operation of the rotating rod (31). The transmission mechanism (6) includes a bevel gear (61) fixedly connected to the transmission rod (51), and a first bevel gear ring (62) meshing with the bevel gear (61) is fixedly connected to the rotating rod (31).

5. The energy-saving purification fume hood according to claim 1, wherein, The hydraulic mechanism (8) includes a control block (81) fixedly connected to the top of the rotating cylinder (71). An annular liquid storage chamber (82) is opened inside the control block (81). A diversion chamber (83) communicating with the inside of the rotating cylinder (71) is opened at the bottom of the annular liquid storage chamber (82). A plurality of centrifugal grooves (84) are circumferentially and arrayedly opened on the inner wall of the annular liquid storage chamber (82). A piston plate (85) is hermetically slidably connected inside the centrifugal groove (84). A second spring (86) is provided between the piston plate (85) and the inner wall of the centrifugal groove (84). A hollow block (87) is fixedly connected to the inner bottom wall of the purification chamber (11) through a support column. A sealing sleeve (88) hermetically connected to the rotating cylinder (71) is fixedly connected to the upper end of the hollow block (87), and the inside of the rotating cylinder (71) is communicated with the inside of the hollow block (87). Control grooves (89) are opened on both inner walls of the lifting frame (54). An infusion hose (810) is communicated between the control groove (89) and the inside of the hollow block (87). A piston block (811) is hermetically slidably connected inside the control groove (89). A push rod (812) is fixedly connected between the moving block (74) and the piston block (811) at the corresponding position. A liquid storage space is formed among the centrifugal groove (84), the annular liquid storage chamber (82), the diversion chamber (83), the rotating cylinder (71), the sealing sleeve (88), the hollow block (87), the infusion hose (810) and the control groove (89), and the liquid storage space is filled with hydraulic oil.

6. The energy-saving purification fume hood according to claim 5, characterized in that, The rotating cylinder (71) is rotatably connected with a plurality of stirring rods (9) distributed in a circumferential array at a position above the filter screen (12). A plurality of groups of stirring plates (91) are fixedly connected to the stirring rods (9). A second bevel gear ring (92) is fixedly connected to the filter screen (12). A third bevel gear ring (93) meshing with the second bevel gear (61) is fixedly connected to the stirring rod (9).

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