Energy-saving purification ventilation cabinet

Abstract

The invention belongs to the technical field of air purification, and particularly relates to an energy-saving purification ventilation cabinet which comprises a cabinet body, a purification cavity is formed in the cabinet body, a filter screen is slidably connected to the inner wall of the purification cavity in the vertical direction, and an exhaust port communicated with the outside is formed in the inner wall of the purification cavity; the flow guide mechanism is used for improving the contact effect of air and the filter screen, and the flow guide mechanism comprises a pretreatment cavity formed in the cabinet body. By arranging the flow guide mechanism and the pretreatment mechanism, air is guided and gathered above the filter screen when entering the inverted-T-shaped purification cavity, the contact time of the air and the filter screen when passing through the filter screen is prolonged, meanwhile, a rotating rod drives a spiral rod to rotate, relatively large particles are pushed to the inner wall of the pretreatment cavity through centrifugal force, and the air purification effect is improved. Relatively large particles in the air are removed in advance during purification, so that the service life of the filter screen is prolonged while the filtering efficiency is improved.

Description

Technical Field

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

[0002] Energy-saving clean fume hoods are ventilation equipment specially used in laboratories and other places. They are designed to effectively purify harmful gases while reducing energy consumption through optimized design and technical means. They are usually equipped with efficient air filtration systems and adjustable airflow control systems 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 China Publication No. CN217043919U, still have the following technical problems during use:

[0004] In the process of air purification, the contact time between air and filter cannot be guaranteed, resulting in limited filtering effect of the filter on the air. At the same time, relatively large particles in the air cannot be removed in advance, resulting in these large particles easily clogging the filter, reducing the air purification effect and greatly shortening the service life of the filter;

[0005] In the process of air purification, some relatively small particles in the air may not be effectively captured due to improper design of the filter mesh aperture, and the particles in the air may "slip" through the filter mesh, resulting in the filter mesh being unable to effectively capture the particles in the air, further reducing the air purification effect. Summary of the invention

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

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

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

[0009] A cabinet, wherein a purification chamber is provided inside the cabinet, a filter screen is slidably connected to the inner wall of the purification chamber in a 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 is used to improve the contact effect between air and the filter screen. The flow guiding mechanism includes a pre-treatment chamber opened inside the cabinet. The space above the filter screen in the purification chamber is arranged in an inverted T shape. An air transmission channel is connected between the pre-treatment chamber and the purification chamber.

[0011] A pretreatment mechanism is used to remove relatively large particles in the air in advance. The pretreatment mechanism includes a rotating rod rotatably connected to the inside of a pretreatment chamber, a spiral rod is fixedly connected to the rotating rod, a storage chamber is opened in the cabinet below the pretreatment chamber, a drive motor is arranged inside the cabinet, and 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 drive motor.

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

[0013] Preferably, a discharge port is provided between the interior of the storage cavity and the outside of the cabinet.

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

[0015] Preferably, a transmission mechanism is also provided in the cabinet for driving the airflow 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 adjustment mechanism is provided in the purification chamber for adaptively adjusting the position of the filter according to the air flow rate. The adjustment mechanism includes a rotating drum that is rotatably connected to the filter, and an axial flow fan blade is provided on the rotating drum. Two slide grooves are symmetrically provided at the upper end of the lifting frame, and a moving block is slidably connected in the slide groove, and a triangular guide plate is fixedly connected to the moving block. Two symmetrically arranged guide rollers are rotatably connected inside the purification chamber, and the guide rollers roll in contact with the triangular guide plates at corresponding positions. A hydraulic mechanism is provided between the rotating drum and the moving block for automatically adjusting the position of the triangular guide plates according to the air flow rate.

[0017] Preferably, the hydraulic mechanism includes a control block fixedly connected to the top of the drum, an annular liquid storage cavity is provided in the control block, a guide cavity connected to the inside of the drum is provided at the bottom of the annular liquid storage cavity, a plurality of centrifugal grooves distributed in a circumferential array are provided on the inner wall of the annular liquid storage cavity, a piston plate is airtightly slidably connected to the centrifugal groove, a second spring is provided 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, a sealing sleeve airtightly connected to the drum is fixedly connected to the upper end of the hollow block, and the inside of the drum is connected to the inside of the hollow block, control grooves are provided on the inner walls of both sides of the lifting frame, an infusion hose is connected between the control groove and the inside of the hollow block, a piston block is airtightly slidably connected in 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 between the centrifugal groove, the annular liquid storage cavity, the guide cavity, the drum, the sealing sleeve, the hollow block, the infusion hose and the control groove, and the liquid storage space is filled with hydraulic oil.

[0018] Preferably, the rotating drum is rotatably connected to a plurality of stirring rods distributed in a circular array at a position 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, and a third bevel gear ring meshing with the second bevel gear is fixedly connected to the stirring rods.

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

[0020] 1. The present invention provides a guide mechanism and a pretreatment mechanism. When purifying the air, the air is guided and gathered above the filter when entering the purification chamber arranged in an inverted T shape, thereby increasing the contact time between the air and the filter when passing through the filter. In the process of the air passing through the pretreatment chamber, the spiral rod is driven to rotate by the rotating rod, so that the air rotates when entering the pretreatment chamber, and relatively large particles are pushed toward the inner wall of the pretreatment chamber by centrifugal force, and move downward along the inner wall. Relatively large particles in the air are removed in advance during purification, so that the remaining fine particles are more effectively captured when passing through the filter, thereby improving the filtration efficiency and extending the service life of the filter.

[0021] 2. The present invention provides an airflow squeezing mechanism. During the process of the filter purifying the air, the transmission rod can drive the cam to rotate, drive the filter to perform reciprocating vertical displacement and vibrate, so that the filter can intermittently squeeze the air, further change the flow state of the air flow periodically, increase the interaction between the particles in the air and the filter, reduce the situation where the particles in the air "slip through" the filter, and at the same time, the vibrating filter can further prevent the filter from being blocked.

[0022] 3. The present invention provides an adjustment mechanism. When the air enters the purification chamber, the impact force generated by the air flow will drive the drum to rotate through the axial flow fan blades, and the flow rate of the air when passing over the filter is adjusted according to the rotation speed of the drum. When the flow rate of the air entering the purification chamber is relatively large, the space between the filter and the top wall of the purification chamber is increased, thereby slowing down the flow rate of the air when passing through the filter, avoiding that the particles cannot fully contact the filter when the air flow rate is too fast, thereby reducing the capture efficiency. When the flow rate of the air entering the purification chamber is relatively small, the space between the filter and the top wall of the purification chamber is reduced, thereby accelerating the flow rate of the air when passing through the filter, avoiding that the air contacts the filter for a long time, causing excessive accumulation of particles on the filter, and causing clogging of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 It is a schematic diagram of the local structure of the rotating drum in the present invention;

[0027] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 yes Figure 4 Enlarged view of point C in the middle.

[0029] In the figure: 1, cabinet; 11, purification chamber; 12, filter; 13, exhaust port; 2, flow guide mechanism; 21, pretreatment chamber; 22, gas transmission channel; 3, pretreatment mechanism; 31, rotating rod; 32, spiral rod; 33, storage chamber; 34, driving motor; 4, gas transmission 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. Adjustment mechanism; 71. Rotating drum; 72. Axial flow fan blades; 73. Slide groove; 74. Moving block; 75. Triangular guide plate; 76. Guide roller; 8. Hydraulic mechanism; 81. Control block; 82. Annular liquid storage chamber; 83. Diversion 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 DESCRIPTION

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

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

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

[0033] Specifically, the exhaust port 13 is located above the filter 12, and the filter 12 is a ULPA filter with a fiber interlaced structure. This structure helps to more effectively capture particles when air flows in a predetermined direction.

[0034] The guide mechanism 2 is used to improve the contact effect between the air and the filter 12. The guide mechanism 2 includes a pre-treatment chamber 21 opened inside the cabinet 1. The space above the filter 12 in the purification chamber 11 is arranged in an inverted T shape. An air delivery channel 22 is connected between the pre-treatment chamber 21 and the purification chamber 11.

[0035] Specifically, when the air flows from the middle of the filter 12 to both sides, the fibers of the filter 12 will come into physical contact with the particles in the air to form 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 to the inside of the pretreatment chamber 21, and a spiral rod 32 is fixedly connected to the rotating rod 31. A storage chamber 33 is opened in the cabinet 1 below the pretreatment chamber 21. A drive 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 drive motor 34.

[0037] Specifically, an air supply pipe 4 is fixedly connected to the inner wall of the pretreatment chamber 21, and the other end of the air supply pipe 4 is connected to an air pump. The air pump can transport external air to the inside of the cabinet 1, and discharge the air after purification is completed, thereby ensuring the purification effect of the air.

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

[0039] In view of the problem that the contact time between air and filter 12 cannot be guaranteed in the prior art, resulting in limited filtering effect of filter 12 on air, and relatively large particles in the air cannot be removed in advance, resulting in these large particles easily clogging filter 12, the present invention sets a guide mechanism 2 and a pre-treatment mechanism 3. During the air purification process, the air is transported to the pre-treatment chamber 21 through the air pump and the air supply pipe 4, and the air is allowed to enter the inverted T-shaped purification chamber 11 through the air supply channel 22, so that the air can be guided and gathered above the filter 12, thereby increasing the contact time between the air and the filter 12 when passing through the filter 12. During the process of air passing through the pre-treatment chamber 21, the driving motor 34 drives the rotating rod 31 to rotate, further driving the spiral rod 3 2 rotates, so that the air rotates when entering the pre-treatment chamber 21. With the rotation of the air, relatively large particles are thrown to the inner wall of the pre-treatment chamber 21 under the action of centrifugal force. Since the inertia force of the particles is greater when the gravity is greater, the inertia of the relatively large particles will cause them to continue to move downward along the inner wall due to their relatively large inertia, and finally be settled into the interior of the storage chamber 33, so that the relatively large particles in the air are removed before purification, while the relatively small particles cannot be completely pushed to the outer wall due to their relatively small inertia, and they will continue to move upward with the air and enter the purification chamber 11 through the air delivery channel 22, so that the remaining fine particles can be more effectively captured in the process of passing through the filter screen 12, thereby improving the filtration efficiency and extending the service life of the filter screen 12.

[0040] An airflow squeezing mechanism 5 is provided inside the cabinet 1, which is used to periodically change the flow state of the airflow to increase the probability of the filter 12 capturing particles in the air. The airflow squeezing mechanism 5 includes a transmission rod 51 rotatably connected to the inside of the cabinet 1, and a cam 52 is fixedly connected to the transmission rod 51. A support plate 53 is fixedly connected to the purification chamber 11, and a lifting frame 54 is provided at a position below the support plate 53 in the purification chamber 11. Two connecting rods 55 are fixedly connected between the lifting frame 54 and the filter 12, and the connecting rod 55 penetrates and is slidably connected to the support plate 53. A limiting groove 56 is provided on the side wall of the purification chamber 11, and a limit block 57 is fixedly connected to the lifting frame 54 and is slidably connected to the inner wall of the limit groove 56 in the vertical direction. The cam 52 periodically contacts and pushes the limit block 57 to move downward, and two first springs 58 are provided between the lifting frame 54 and the inner bottom wall of the purification chamber 11.

[0041] In view of the problem in the prior art that some relatively small particles in the air cannot be effectively captured due to their small size due to improper design of the aperture of the filter 12, and the particles in the air may "slip" through the filter, resulting in the filter 12 being unable to effectively capture the particles in the air, the present invention provides an airflow squeezing mechanism 5. During the process of the filter 12 purifying the air, the transmission rod 51 can drive the cam 52 to rotate, so that the cam 52 periodically resists and pushes the limit block 57 to move downward, and further the lifting frame 54 drives the filter 12 to move downward periodically, and resets under the elastic force of the first spring 58, so that the filter 12 reciprocates vertically and vibrates, so that the filter 12 can intermittently squeeze the air above the filter 12. In the process of air being squeezed, the overall kinetic energy of the air and impurities increases, and the relative movement and collision between the particles and the filter 12 also become more intense. The fiber structure of the filter 12 can effectively intercept impurities when the particles move more violently due to the increase in kinetic energy. In addition, the periodic change of the airflow makes it more likely that the particles that might originally pass through the filter in a straight line due to inertia will change their motion trajectory and come into contact with and be captured by the filter due to the changes in the direction and speed of the airflow. Therefore, the situation of particles in the air "slipping" over the filter 12 can be reduced, and the particles in the air can be redirected to the surface of the filter 12, thereby enhancing the purification and filtering effect of the filter 12 on the air. At the same time, the vibrating filter 12 can further prevent blockage.

[0042] It is worth mentioning that a transmission mechanism 6 is also provided in the cabinet 1, which is used to drive the airflow 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. In 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 airflow extrusion mechanism 5 and the pretreatment mechanism 3 work synchronously, which saves the driving source while improving the overall linkage of the device, thereby achieving the purpose of energy saving and efficiency improvement.

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

[0044] The hydraulic mechanism 8 includes a control block 81 fixedly connected to the top of the drum 71, an annular liquid storage chamber 82 is provided in the control block 81, a guide chamber 83 communicating with the inside of the drum 71 is provided at the bottom of the annular liquid storage chamber 82, a plurality of centrifugal grooves 84 distributed in a circumferential array are provided on the inner wall of the annular liquid storage chamber 82, a piston plate 85 is airtightly 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, and a sealing member airtightly connected to the drum 71 is fixedly connected to the upper end of the hollow block 87 Sleeve 88, and the interior of the rotating cylinder 71 is connected with the interior of the hollow block 87, control grooves 89 are opened on the inner walls on both sides of the lifting frame 54, and an infusion hose 810 is connected between the control groove 89 and the interior of the hollow block 87, and a piston block 811 is airtightly slidably connected in the control groove 89, and a push rod 812 is fixedly connected between the moving block 74 and the corresponding position piston block 811, and a liquid storage space is formed among the centrifugal groove 84, the annular liquid storage cavity 82, the guide 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 rotating drum 71 to maintain a sealed connection with the sealing sleeve 88 and perform vertical displacement when the lifting frame 54 and the filter screen 12 are lifted and displaced, while the infusion hose 810 can be bent, thereby avoiding motion interference and preventing the delivery of the hydraulic oil from being affected, thereby affecting the transmission effect of the hydraulic oil.

[0046] It should also be noted that, by providing the regulating mechanism 7, the impact force generated by the air flow during the process of air entering the purification chamber 11 will drive the drum 71 to rotate through the axial flow blades 72, and adjust the flow rate of the air flowing through the filter screen 12 according to the rotation speed of the drum 71:

[0047] When the flow rate of air entering the purification chamber 11 is relatively large, the impact force generated by the air flow will drive the rotating drum 71 to rotate faster, so that the centrifugal force of the piston plate 85 inside the control block 81 is relatively large, and the piston plate 85 further 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, and further allows the hydraulic oil to enter the control groove 89 through the guide cavity 83, the rotating drum 71, the hollow block 87 and the infusion hose 810, so that the piston plate 85 in the control groove 89 slides and drives the two piston blocks 81. 1 move away from each other, and further, under the action of the push rod 812, the two triangular guide plates 75 move away from each other. Since the positions of the triangular guide plates 75 are limited by the guide rollers 76, when the triangular guide plates 75 move away from each other, the initial positions of the lifting frame 54 and the filter screen 12 when not pushed by the cam 52 will move downward, so that the space between the filter screen 12 and the top wall of the purification chamber 11 is increased, thereby slowing down the flow rate of air passing through the filter screen 12, avoiding that the particles cannot fully contact with the filter screen 12 when the air flow rate is too fast, and the capture efficiency is reduced;

[0048] When the flow rate of air entering the purification chamber 11 is relatively small, the impact force generated during the air flow will drive the rotation speed of the drum 71 to be slower, so that the centrifugal force of the piston plate 85 inside the control block 81 is relatively small, so that the piston plate 85 can pump 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 approach each other, and the initial positions of the lifting frame 54 and the filter screen 12 when not pushed by the cam 52 will move upward, so that the space between the filter screen 12 and the top wall of the purification chamber 11 is reduced, thereby accelerating the flow rate of air passing through the filter screen 12, avoiding long-term contact between the air and the filter screen 12, causing excessive accumulation of particles on the filter screen 12, and causing the filter screen to be blocked.

[0049] In addition, the rotating drum 71 is rotatably connected to a plurality of stirring rods 9 distributed in a circular array at a position above the filter screen 12, a plurality 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, and 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 rotating drum 71, the third bevel gear ring 93 on the stirring rod 9 will be driven to perform a circular motion along the second bevel gear ring 92, so that the stirring rod 9 rotates during the circular motion, so that the air can more fully contact the filter screen 12 when flowing over the filter screen 12, and the air can be purified more thoroughly.

[0050] The present invention can be explained by the following operation mode:

[0051] When in use, the outside air can be transported to the inside of the cabinet 1 through the air pump and the air pipe 4. When the air enters the pre-treatment chamber 21, the driving motor 34 drives the rotating rod 31 to rotate, and further drives the spiral rod 32 to rotate, so that the air rotates when entering the pre-treatment chamber 21. As the air rotates, the centrifugal force pushes the relatively large particles to the inner wall of the pre-treatment 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 with an inverted T-shaped arrangement, the air is guided and gathered above the filter 12, thereby increasing the contact time between the air and the filter 12.

[0052] When the filter 12 purifies the air, the rotation of the rotating rod 31 drives the transmission rod 51 to rotate synchronously through the first bevel gear ring 62 and the bevel gear 61, and then drives the cam 52 to rotate, so that the cam 52 periodically contacts and pushes the limit block 57 to move downward, and resets under the elastic force of the first spring 58, so that the filter 12 can reciprocate vertically and vibrate, and the filter 12 can intermittently squeeze the air, increase the interaction between the particles in the air and the filter 12, and reduce the situation where the particles in the air "slip through" the filter 12;

[0053] When the air enters the purification chamber 11, the impact force generated by the air flow will drive the drum 71 to rotate through the axial flow fan blades 72, and adjust the flow rate of the air when it flows over the filter 12 according to the rotation speed of the drum 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 12 when not pushed by the cam 52 will be in a relatively downward displacement, so that the space between the filter 12 and the top wall of the purification chamber 11 is relatively large, so that the flow rate of the air when passing through the filter 12 is slowed down. If the air flow rate is relatively small, the initial positions of the lifting frame 54 and the filter 12 when not pushed by the cam 52 will be in a relatively upward displacement, so that the space between the filter 12 and the top wall of the purification chamber 11 is relatively small, so that the flow rate of the air when passing through the filter 12 is accelerated, so that the flow rate of the air flowing over the filter 12 is always in a more suitable state during purification.

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

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving purification fume hood, characterized in that: include: A cabinet (1), wherein a purification chamber (11) is provided inside the cabinet (1), a filter screen (12) is slidably connected to the inner wall of the purification chamber (11) in a vertical direction, and an exhaust port (13) communicating with the outside is provided on the inner wall of the purification chamber (11); A flow guiding mechanism (2), the flow guiding mechanism (2) comprising a pre-treatment chamber (21) opened inside the cabinet (1), the space above the filter screen (12) in the purification chamber (11) being arranged in an inverted T shape, and an air transmission channel (22) being connected between the pre-treatment chamber (21) and the purification chamber (11); A pretreatment mechanism (3), the pretreatment mechanism (3) comprising a rotating rod (31) rotatably arranged inside a pretreatment chamber (21), a spiral rod (32) being fixedly connected to the rotating rod (31), a storage chamber (33) being provided in the cabinet (1) below the pretreatment chamber (21), a driving motor (34) being provided inside the cabinet (1), the bottom end of the rotating rod (31) passing through the bottom wall of the storage chamber (33) and being fixedly connected to the output shaft of the driving motor (34).

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

3. The energy-saving purification fume hood according to claim 2 is characterized in that: A discharge port is provided between the interior of the storage cavity (33) and the outside of the cabinet (1).

4. The energy-saving purification fume hood according to claim 1 is characterized in that: An airflow squeezing mechanism (5) is provided inside the cabinet (1) for periodically changing the flow state of the airflow so as to increase the probability of the filter (12) capturing particles in the air. The airflow squeezing mechanism (5) comprises a transmission rod (51) rotatably connected to the inside of the cabinet (1), a cam (52) being fixedly connected to the transmission rod (51), and a rotation groove for the cam (52) to rotate is provided inside the cabinet (1). A support plate (53) is fixedly connected inside the purification chamber (11), and a lifting member is provided at a position below the support plate (53) in the purification chamber (11). A lowering frame (54), two connecting rods (55) are fixedly connected between the lifting frame (54) and the filter screen (12), and the connecting rods (55) are slidably connected to the support plate (53). The side wall of the purification chamber (11) is provided with a limiting groove (56), and 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 contacts and pushes the limiting block (57) to move downward, and two first springs (58) are provided between the lifting frame (54) and the inner bottom wall of the purification chamber (11).

5. The energy-saving purification fume hood according to claim 4 is characterized in that: A transmission mechanism (6) is also provided in the cabinet (1) for driving the airflow extrusion mechanism (5) to work synchronously when the rotating rod (31) is working. The transmission mechanism (6) comprises a bevel gear (61) fixedly connected to the transmission rod (51). The rotating rod (31) is fixedly connected to a first bevel gear ring (62) meshing with the bevel gear (61).

6. The energy-saving purification fume hood according to claim 4 is characterized in that: An adjusting mechanism (7) is provided in the purification chamber (11) for adaptively adjusting the position of the filter screen (12) according to the air flow rate. The adjusting mechanism (7) comprises a rotating drum (71) which is rotatably connected to the filter screen (12). The rotating drum (71) is provided with axial flow blades (72). Two sliding grooves (73) are symmetrically provided at the upper end of the lifting frame (54). Moving blocks (74) are slidably connected in the sliding grooves (73). Triangular guide plates (75) are symmetrically fixedly connected to the two moving blocks (74). Two symmetrically arranged guide rollers (76) are rotatably connected inside the purification chamber (11). The guide rollers (76) roll in contact with the triangular guide plates (75) at corresponding positions. A hydraulic mechanism (8) is provided between the rotating drum (71) and the moving block (74) for automatically adjusting the position of the triangular guide plates (75) according to the air flow rate.

7. The energy-saving purification fume hood according to claim 6 is characterized in that: The hydraulic mechanism (8) comprises a control block (81) fixedly connected to the top of the drum (71); an annular liquid storage chamber (82) is provided in the control block (81); a guide chamber (83) communicating with the inside of the drum (71) is provided at the bottom of the annular liquid storage chamber (82); a plurality of centrifugal grooves (84) distributed in a circumferential array are provided on the inner wall of the annular liquid storage chamber (82); a piston plate (85) is airtightly 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) via a support column; a sealing sleeve airtightly connected to the drum (71) is fixedly connected to the upper end of the hollow block (87). The rotary cylinder (88) is provided with a rotary cylinder (71) and the interior of the hollow block (87) is communicated with the interior of the rotary cylinder (71). The inner walls on both sides of the lifting frame (54) are provided with control grooves (89). A liquid infusion hose (810) is communicated between the control groove (89) and the interior of the hollow block (87). A piston block (811) is airtightly 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 a corresponding position. A liquid storage space is formed between the centrifugal groove (84), the annular liquid storage cavity (82), the guide cavity (83), the rotary cylinder (71), the sealing sleeve (88), the hollow block (87), the liquid infusion hose (810) and the control groove (89), and the liquid storage space is filled with hydraulic oil.

8. The energy-saving purification fume hood according to claim 7 is characterized in that: The rotating drum (71) is rotatably connected to 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); and a third bevel gear ring (93) meshing with the second bevel gear (61) is fixedly connected to the stirring rods (9).

Images