A laboratory ventilation device

Abstract

The present invention relates to the field of ventilation technology, and specifically discloses a laboratory ventilation device, including an air supply duct and a filter screen, wherein the air supply direction is defined as conveying from left to right, a condensing cylinder is installed in the air supply duct, the condensing cylinder is filled with a condensing agent, at least two spiral blades are arranged on the periphery of the condensing cylinder, a driving component for driving the spiral blade to rotate and a limiting component for limiting the spiral blade to follow the driving component to rotate are arranged in the air supply duct, a capturing component is arranged on the right side of the spiral blade, the filter screen is arranged on the right side of the condensing cylinder, and a sewage outlet is opened at the bottom of the air supply duct. The laboratory ventilation device of the present invention can adsorb and intercept dust impurities in the air in the air supply duct, and the capturing component can clean the dust impurities adsorbed on the spiral blades, and the spiral blades can scrape off the dust impurities adsorbed on the outer wall of the condensing cylinder when rotating, thereby realizing automatic cleaning of the spiral blades and the outer wall of the condensing cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation, and in particular to a laboratory ventilation device. Background Art

[0002] The ventilation device is the component in the air conditioning system responsible for delivering processed air to the indoor space. Dust and dirt in the ventilation duct will not only reduce the air supply efficiency, but also pollute the air in the laboratory, which will have an adverse effect on the health of the experimenters and the experimental environment. Therefore, dust removal of the laboratory ventilation device is very important.

[0003] The Chinese patent with the announcement number CN221076739U discloses an air supply duct filter for air conditioners, including a filter body, the filter body is fixed in the air supply duct by a fixing structure, a water storage chamber is arranged on the left wall of the filter body, an atomizing spray head is installed at the lower end of the water storage chamber, and a multi-layer filtering structure is arranged in the filter body. When the air is dry, the water in the water storage chamber is pumped out by a water pump, sprayed out through the atomizing spray head, and the filtered air is soaked so that the exhausted air will not be dry. When the filter body needs to be disassembled and replaced, the first card block is pulled into the installation slot to separate the first card block from the card slot, and the filter body can be removed separately. The electrostatic generator can generate static electricity on the electrostatic adsorption net, which can effectively adsorb dust inside the air supply duct and in the air of the air conditioner, and achieve the effect of electrostatic dust removal. The filter structure is fixed by a fixing rod, and the filter structure can be taken out at one time.

[0004] Although the above technical solution can filter the air in the air supply duct, when a large amount of dust and impurities filtered out on the filter structure accumulate, it will affect the air supply efficiency of the air supply duct. In addition, when cleaning the filter structure, the filter structure needs to be disassembled, which is troublesome to operate.

[0005] Therefore, the art needs a laboratory ventilation device to solve the above problems. Summary of the invention

[0006] The present invention provides a laboratory ventilation device, aiming to solve the problems in the related art that the filtering structure of the ventilation device is prone to accumulate a lot of dust and impurities, affecting the air supply efficiency, and the filtering structure needs to be disassembled for cleaning, which is cumbersome to operate.

[0007] A laboratory ventilation device of the present invention comprises an air supply duct and a filter screen, wherein the air supply direction is defined as conveying from left to right, a condensing cylinder is installed in the air supply duct, a condensing agent is filled in the condensing cylinder, at least two spiral blades are arranged on the periphery of the condensing cylinder, a driving component for driving the spiral blades to rotate and a limiting component for limiting the spiral blades to follow the driving component to rotate are arranged in the air supply duct, a capturing component is arranged on the right side of the spiral blades, the filter screen is arranged on the right side of the condensing cylinder, and a sewage outlet is opened at the bottom of the air supply duct;

[0008] When the limiting component restricts one of the spiral blades to rotate with the driving component, the capturing component on the rotating spiral blade cleans the dust and impurities on the stopped spiral blade. When the thrust force of the rotating spiral blade on the stopped spiral blade reaches a preset value, the stopped spiral blade follows the driving component to rotate again, and the spiral blade generating the thrust force is restricted by the limiting component.

[0009] The outer wall of the condensing tube of the present invention can form condensation beads to absorb dust and impurities in the air in the air supply duct. The capturing component can intercept impurities such as lint in the air, greatly reducing the dust and impurities contained in the air when it flows through the filter, ensuring the smooth flow of the air supply duct and improving the air supply efficiency. Moreover, through the cooperation of the limiting component, the capturing component can clean the dust and impurities absorbed on the spiral blades. When the spiral blades rotate, they can scrape off the dust and impurities absorbed on the outer wall of the condensing tube, thereby realizing automatic cleaning of the spiral blades and the outer wall of the condensing tube.

[0010] Preferably, the driving assembly includes a motor fixedly connected to the air supply duct and two mounting plates, the mounting plates are fixedly connected to the output shaft of the motor, the two mounting plates are symmetrically arranged at both ends of the condensing cylinder, and the two mounting plates are respectively provided with mounting grooves corresponding to the number of spiral blades on one side facing each other, and the two ends of the spiral blades are respectively connected to connecting rods extending into the mounting grooves.

[0011] Preferably, the mounting groove is an arc-shaped groove, and when the limiting component restricts the spiral blade from following the movement of the driving component, the connecting rod of the spiral blade escapes from the mounting groove.

[0012] Preferably, the limit assembly includes two guide blocks fixedly connected to the two ends of the condensing cylinder, the two guide blocks are symmetrically arranged, and the two guide blocks are respectively provided with guide surfaces on one side facing each other, the guide surfaces of the two guide blocks gradually incline toward each other along the rotation direction of the spiral blades, and the limit blocks are elastically connected to the guide blocks, and the two ends of the spiral blades move along the corresponding guide surfaces. When the spiral blades abut against the limit blocks, the connecting rod on the spiral blades slips out of the mounting groove, and the connecting rod on the spiral blades that is pushed out of the guide blocks enters the mounting groove.

[0013] When the previous spiral blade that stayed at the guide block was pushed by the adjacent spiral blade to disengage from the limit block, its connecting rod entered into the mounting groove corresponding to the adjacent spiral blade. When the adjacent spiral blade came into contact with the limit block, the connecting rod of the adjacent spiral blade slipped out of the mounting groove, and the adjacent spiral blade stayed between the guide blocks. The spiral blade whose connecting rod entered the mounting groove was pushed by the mounting groove and started to rotate, thereby realizing automatic switching of the position of the stopped spiral blade and the rotating spiral blade.

[0014] Preferably, a dirt collecting bin is provided on the right side of the condensing cylinder, and an opening corresponding to the sewage outlet is provided at the bottom of the dirt collecting bin, the left side of the filter screen is fitted with the dirt collecting bin, a back-blowing assembly is provided on the condensing cylinder, the back-blowing assembly is located on the right side of the filter screen and corresponds to the position of the dirt collecting bin, the filter screen is rotatably connected to the condensing cylinder, a driving member 1 for driving the filter screen to rotate and a driving member 2 for driving the back-blowing assembly to back-blow are provided on the condensing cylinder, and a gap is provided between the dirt collecting bin and the filter screen on the side facing away from the rotation direction of the filter screen.

[0015] The back-blowing assembly is driven by the second driving member to back-blow the filter, and the dust and impurities filtered on the filter are back-blown into the dirt collecting bin. The filter is driven by the first driving member to rotate, so that the back-blowing assembly can back-blow and clean the filter comprehensively.

[0016] Preferably, driving member 1 includes gear 1, gear 2, an incomplete gear and a ring gear, gear 1 is fixedly connected to the output shaft of the motor, gear 2 is rotatably connected to the condensing cylinder, the incomplete gear is coaxially arranged and fixedly connected to gear 2, the ring gear is coaxially arranged and fixedly connected to the filter screen, gear 2 is meshed with gear 1, and the incomplete gear is meshed with the ring gear, the motor drives gear 1 to rotate, gear 1 drives gear 2 and the incomplete gear to rotate, and the incomplete gear drives the ring gear to drive the filter screen to rotate.

[0017] The motor is used as a driving source, and the transmission is carried out through the cooperation of gear one, gear two, incomplete gear and gear ring, which not only drives the filter to rotate, but also eliminates the need to set up another driving source for the filter, thereby reducing costs.

[0018] Preferably, the back-blowing assembly includes a back-blowing bin and a back-blowing plate slidably connected to the back-blowing bin along the air supply direction, the driving member 2 includes a driving part, rack 1, rack 2 and gear 3, the condensing cylinder is fixedly connected to a mounting box, rack 1 slides with the mounting box along the air supply direction, rack 1 is fixedly connected to the driving part, rack 2 is fixedly connected to the back-blowing plate, gear 3 is rotatably connected to the mounting box, rack 1 and rack 2 are respectively located on the lower side and upper side of gear 3, and are meshed with gear 3. When the driving part drives rack 1 to move, rack 1 drives rack 2 to move through gear 3, and rack 2 drives the back-blowing plate to move toward the direction close to the filter screen.

[0019] Preferably, the driving part includes a push rod and a return spring, the push rod is slidably connected to the installation box along the air supply direction, a push plate is fixedly connected to the left side of the push rod, the return spring is connected between the push plate and the installation box, and the rack 1 is fixedly connected to the push rod. When the spiral blade is disengaged from the guide block and resets, the push plate is squeezed to drive the push rod and the rack 1 to move.

[0020] Preferably, the capture assembly includes a main capture rod and a plurality of capture branches connected to the main capture rod, the main capture rod is fixedly connected to the spiral blade, the main capture rod and the capture branches are integrally formed, and the main capture rod and the capture branches are made of rubber.

[0021] The rubber-made capture component has elastic deformation performance. When two adjacent spiral blades approach each other, the capture component can bend to clean the dust and impurities adsorbed on the spiral blades.

[0022] Preferably, a flat surface is provided at the position where the limit block is provided on the guide surface.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention provides a condensation cylinder. When the humid air passes through the spiral channel formed by the spiral blades and the condensation cylinder, condensation beads are formed on the outer wall of the condensation cylinder and the spiral blades. The condensation beads can absorb dust impurities in the air. The capture component can also intercept impurities such as fluff in the air, greatly reducing the dust impurities contained in the air when it flows through the filter, ensuring the smoothness of the air supply duct and improving the air supply efficiency.

[0025] (2) The present invention uses a capture component to clean the dust and impurities adsorbed on the spiral blade, so that the dust and impurities on the spiral blade are more likely to fall off the spiral blade. In addition, during the rotation of the spiral blade, the spiral blade will push the fallen dust and impurities to the sewage outlet for discharge, thereby realizing automatic cleaning of the spiral blade;

[0026] (3) When the spiral blades in the present invention rotate, they can scrape off the dust and impurities adsorbed on the outer wall of the condenser tube, thereby ensuring the adsorption effect of the outer wall of the condenser tube, and also realizing automatic cleaning of the outer wall of the condenser tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of a laboratory ventilation device of the present invention.

[0028] Figure 2 It is a schematic diagram of the internal structure of a laboratory ventilation device of the present invention.

[0029] Figure 3 The invention discloses a schematic structural diagram of a mounting plate and a guide block of a laboratory ventilation device.

[0030] Figure 4 yes Figure 2 A partial enlarged view of part A.

[0031] Figure 5 The invention discloses a schematic diagram of assembling a filter screen and a condensation cylinder of a laboratory ventilation device.

[0032] Figure 6 The present invention is a schematic diagram of the structure of a filter screen of a laboratory ventilation device.

[0033] Figure 7 The invention discloses a schematic structural diagram of a backflush assembly of a laboratory ventilation device.

[0034] Figure 8 It is a cross-sectional view of a condenser cylinder of a laboratory ventilation device of the present invention when it is installed in an air supply duct.

[0035] Figure 9 The invention discloses a cross-sectional view of a mounting plate and a condensing cylinder of a laboratory ventilation device during assembly.

[0036] Figure 10 The invention discloses a schematic diagram of assembling a spiral blade and a mounting plate of a laboratory ventilation device.

[0037] Reference numerals:

[0038] 1. Air supply duct; 11. Drain outlet; 12. Mounting plate; 13. Mounting cylinder; 2. Filter; 3. Condensation cylinder; 30. Support structure; 31. Guide block; 32. Guide surface; 33. Limit block; 34. Flat surface; 35. Sewage collection bin; 36. Door body; 37. Mounting box; 38. Baffle; 39. Movable groove; 4. Spiral blade; 41. Connecting rod; 5. Main capture rod; 51. Capture branch; 6. Motor; 7. Mounting plate; 71. Mounting groove; 8. Gear 1; 81. Gear 2; 83. Incomplete gear; 84. Gear ring; 9. Backflush bin; 91. Backflush plate; 92. Air outlet plate; 93. One-way air outlet valve; 94. One-way air inlet valve; 95. Push rod; 96. Reset spring; 97. Push plate; 10. Rack 1; 101. Rack 2; 102. Gear 3. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] like Figures 1 to 10 As shown, and refer to Figure 1In the orientation shown, the air supply direction is from left to right. A laboratory ventilation device of the present invention includes an air supply duct 1 and a filter screen 2. A condensation cylinder 3 is fixedly installed in the air supply duct 1, and a coolant is filled in the condensation cylinder 3. As an example, the condensation cylinder 3 can be set as a double-layer cylinder, and the coolant is filled in the interlayer formed by the double-layer cylinder, reducing the amount of coolant used. Three spiral blades 4 are arranged on the outer periphery of the condensation cylinder 3. The inner periphery of the spiral blades 4 is attached to the outer wall of the condensation cylinder 3, and the outer periphery is attached to the inner wall of the air supply duct 1. A driving component for driving the spiral blades 4 to rotate relative to the condensation cylinder 3 and a limiting component for restricting the spiral blades 4 from following the driving component to rotate are arranged in the air supply duct 1. A plurality of capture components are arranged on the right side of the spiral blades 4. The filter screen 2 is arranged on the right side of the condensation cylinder 3. A sewage discharge port 11 is opened at the bottom of the air supply duct 1.

[0041] Air passes through the spiral channel formed by the spiral blades 4 and the condensation cylinder 3. When the air is relatively humid, condensate beads will form on the outer wall of the condensation cylinder 3 and the spiral blades 4. The condensate beads can adsorb dust impurities in the air, and the capture components can also intercept impurities such as fluff in the air, greatly reducing the dust impurities contained in the air flowing through the filter screen 2, ensuring the smoothness of the air supply duct 1, improving the air supply efficiency and quality, and improving the laboratory air environment.

[0042] As Figure 2 and Figure 10 shown, taking the orientation when looking at the mounting disc 7 from right to left frontally as a reference, when the driving component drives the spiral blades 4 to rotate clockwise and the limiting component restricts one of the spiral blades 4 from following the driving component to rotate, the capture components on the rotating spiral blades 4 clean the dust impurities on the stationary spiral blades 4. When the pushing force of the rotating spiral blades 4 on the stationary spiral blades 4 reaches a preset value, the stationary spiral blades 4 start to rotate again following the driving component, and the spiral blades 4 generating the pushing force are restricted by the limiting component.

[0043] By cleaning the dust impurities adsorbed on the spiral blades 4 through the capture components, it makes it easier for the dust impurities on the spiral blades 4 to fall off the spiral blades 4. Moreover, during the rotation of the spiral blades 4, the spiral blades 4 will push the fallen dust impurities to the sewage discharge port 11 for discharge, realizing the automatic cleaning of the spiral blades 4. In addition, during the rotation of the spiral blades 4, the spiral blades 4 will scrape off the dust impurities adsorbed on the outer wall of the condensation cylinder 3, ensuring the adsorption effect on the outer wall of the condensation cylinder 3 and also realizing the automatic cleaning of the outer wall of the condensation cylinder 3.

[0044] As Figure 2 and Figure 10As shown, the capture assembly includes a main capture rod 5 and a plurality of capture branches 51 connected to the main capture rod 5, the main capture rod 5 is fixedly connected to the spiral blade 4, the main capture rod 5 and the capture branches 51 are integrally formed, and the main capture rod 5 and the capture branches 51 are made of rubber. The main capture rod 5 is inclined from one end connected to the spiral blade 4 to the other end in a direction close to the condensing cylinder 3.

[0045] like Figures 1 to 4 as well as Figure 8 and Figure 9 As shown, the drive assembly includes a motor 6 and two mounting discs 7. A mounting plate 12 is fixedly connected in the air supply duct 1. An air vent for air to pass through is formed between the mounting plate 12 and the air supply duct 1. A mounting cylinder 13 is fixedly connected to the right side of the mounting plate 12. The motor 6 is fixedly connected to the mounting plate 12, wherein the mounting disc 7 on the left side is rotatably matched with the mounting cylinder 13. The left end of the condensing cylinder 3 is rotatably matched with the mounting disc 7 on the left side, so that the mounting disc 7 on the left side can rotate relative to the condensing cylinder 3. The right end of the condensing cylinder 3 is fixedly connected with a supporting structure 30, and is fixedly connected to the inner wall of the air supply duct 1 through the supporting structure 30. The mounting disc 7 on the right side is rotatably matched with the supporting structure 30 of the condensing cylinder 3, so that the mounting disc 7 on the right side can rotate relative to the condensing cylinder 3. The mounting disc 7 rotatably matched with the mounting cylinder 13 is fixedly connected to the output shaft of the motor 6. The two mounting discs 7 are respectively provided with mounting grooves 71 corresponding to the number of spiral blades 4 on one side facing each other, and the two ends of the spiral blades 4 are respectively connected with connecting rods 41 extending into the mounting grooves 71. When the motor 6 drives the mounting plate 7 to rotate, the mounting plate 7 drives the spiral blade 4 to rotate through the cooperation between the mounting groove 71 and the connecting rod 41 .

[0046] The mounting groove 71 is an arc groove, and the limit assembly includes two guide blocks 31 fixedly connected to the two ends of the condensing cylinder 3. The two guide blocks 31 are symmetrically arranged, and the two guide blocks 31 are respectively provided with guide surfaces 32 on one side facing each other, and the guide surfaces 32 of the two guide blocks 31 gradually tilt toward each other along the rotation direction of the spiral blade 4. A slot is provided on the guide block 31, and the slot is elastically connected to the limit block 33 through a second spring, and the end of the limit block 33 away from the slot is hemispherical. A flat surface 34 is provided at the position where the limit block 33 is provided on the guide surface 32.

[0047] When the spiral blade 4 rotates to contact the guide block 31, the two ends of the spiral blade 4 move along the corresponding guide surface 32, and the spiral blade 4 gradually gathers toward the middle. When the spiral blade 4 abuts against the limit block 33, the connecting rod 41 comes out of the mounting groove 71, and the spiral blade 4 stops rotating. The two ends of the spiral blade 4 abut against the flat surface 34 of the guide block 31. As the mounting plate 7 continues to rotate, the adjacent spiral blade 4 located behind the stopped spiral blade 4 in the rotation direction gradually approaches the stopped spiral blade 4. After the main capture rod 5 and the capture branch 51 on the adjacent spiral blade 4 contact the stopped spiral blade 4, they will be squeezed and bent toward the direction close to the condensation cylinder 3 during the continuous rotation of the adjacent spiral blade 4, and at the same time, as the spiral blade 4 rotates, the dust and impurities on the stopped spiral blade 4 are cleaned. Since the limit block 33 forms a stop for the stopped spiral blade 4, the stopped spiral blade 4 will not immediately detach from the limit block 33 when the adjacent spiral blade 4 gradually approaches the stopped spiral blade 4, thereby realizing automatic cleaning of the stopped spiral blade 4 by the capture component.

[0048] When the thrust force of the adjacent spiral blade 4 on the stopped spiral blade 4 is greater than the stopping force of the stop block 33 on the stopped spiral blade 4, the stop block 33 is squeezed into the slot, and the stopped spiral blade 4 is pushed out of the guide block 31. After being out of the guide block 31, the spiral blade 4 is ejected to both sides under the action of its own elastic force, and the connecting rods 41 at both ends of the spiral blade 4 enter the installation groove 71. The two ends of the spiral blade 4 hit the condensing cylinder 3 to form vibration, which helps the dust and impurities on the spiral blade 4 to fall off. The adjacent spiral blade 4 that pushes the spiral blade 4 stops rotating under the stop of the stop block 33, and its connecting rod 41 is out of the installation groove 71, waiting for the next spiral blade 4 to clean the stopped spiral blade 4, and repeating the above process, thereby realizing automatic cleaning of all spiral blades 4.

[0049] like Figure 1 and Figure 5 As shown, a dirt collecting bin 35 is provided on the right side of the condensing cylinder 3, and an opening corresponding to the sewage outlet 11 is provided at the bottom of the dirt collecting bin 35. The sewage outlet 11 and the opening are both provided with a door body 36, which can be opened when sewage needs to be discharged. The left side of the filter 2 is fitted with the dirt collecting bin 35, and a back-blowing assembly is provided on the condensing cylinder 3. The back-blowing assembly is located on the right side of the filter 2 and corresponds to the position of the dirt collecting bin 35. The filter 2 is rotated in coordination with the condensing cylinder 3, and a driving member 1 for driving the filter 2 to rotate relative to the condensing cylinder 3 and a driving member 2 for driving the back-blowing assembly to back-blow are provided on the condensing cylinder 3. A gap is provided between the side of the dirt collecting bin 35 that is away from the rotation direction of the filter 2 and the filter 2, otherwise the side wall of the dirt collecting bin 35 that is away from the rotation direction of the filter 2 will contact the filter 2, blocking the debris attached to the filter 2 outside the dirt collecting bin 35, affecting the collection of the debris attached to the filter 2.

[0050] The back-blowing assembly is driven by the second driving member to back-blow the filter 2, and the dust and impurities filtered on the filter 2 are back-blown into the dirt collecting bin 35. The filter 2 is driven by the first driving member to rotate, so that the back-blowing assembly can back-blow and clean the filter 2 comprehensively.

[0051] like Figure 5 and Figure 6 As shown, driving member 1 includes gear 1 8, gear 2 81, incomplete gear 83 and ring gear 84. Gear 1 8 is fixedly connected to the output shaft of motor 6. Gear 2 81 is rotationally connected to condenser cylinder 3 via a rotating shaft. Incomplete gear 83 is coaxially arranged and fixedly connected to gear 2 81. Ring gear 84 is coaxially arranged and fixedly connected to filter screen 2. Gear 2 81 meshes with gear 1 8. Incomplete gear 83 meshes with ring gear 84. When the orientation when viewing mounting disk 7 from right to left is used as a reference, motor 6 drives mounting disk 7 to rotate clockwise. When the orientation when viewing mounting disk 7 from left to right is used as a reference, motor 6 drives mounting disk 7 to rotate counterclockwise. This description is based on the orientation when viewing mounting disk 7 from left to right, that is, the output shaft of motor 6 rotates counterclockwise at this time. Figure 5 and Figure 6 As shown, the gear 1 8 fixedly connected to the output shaft of the motor 6 also rotates counterclockwise, the gear 1 8 drives the gear 2 81 and the incomplete gear 83 to rotate clockwise, the incomplete gear 83 drives the gear ring 84 to drive the filter 2 to rotate clockwise, after the teeth of the incomplete gear 83 are disengaged from the gear ring 84, the filter 2 stops rotating, so that the backflush assembly can fully backflush and clean the part corresponding to the filter 2 and the dirt collecting bin 35, and the side wall of the dirt collecting bin 35 away from the rotation direction of the filter 2 is Figure 5 The right side wall of the dirt collecting bin 35 in the orientation shown in FIG.

[0052] like Figure 5 and Figure 7As shown, the backwashing assembly includes a backwashing chamber 9 and a backwashing plate 91 slidably connected to the backwashing chamber 9 along the air supply direction. An air outlet plate 92 is fixedly connected inside the backwashing chamber 9. A one-way air outlet valve 93 is provided on the air outlet plate 92. The backwashing chamber 9 is provided with a one-way air inlet valve 94 on the side of the air outlet plate 92 facing away from the filter net 2. The second driving member includes a driving portion, a first rack 10, a second rack 101, and a third gear 102. The condensation cylinder 3 is fixedly connected with a mounting box 37. Since the condensation cylinder 3 is fixedly installed in the air supply duct 1 through a support structure 30, the mounting box 37 fixedly connected to the condensation cylinder 3 also remains fixed, and the filter net 2 rotates relative to the mounting box 37. A baffle 38 is fixedly connected inside the mounting box 37. The driving portion includes a top push rod 95 and a return spring 96. The top push rod 95 is slidably connected to the baffle 38 of the mounting box 37 along the air supply direction. A top push plate 97 is fixedly connected to the left side of the top push rod 95. The return spring 96 is connected between the top push plate 97 and the baffle 38. The first rack 10 is fixedly connected to the top push rod 95. The second rack 101 is fixedly connected to the backwashing plate 91 through a connecting rod (not shown in the figure). The mounting box 37 is provided with a moving groove 39 for the connecting rod to move. The third gear 102 is rotatably connected to the mounting box 37. The first rack 10 and the second rack 101 are respectively located on the lower side and the upper side of the third gear 102 and are respectively engaged with the third gear 102.

[0053] When the spiral blade 4 disengages from the guide block 31 and resets, it bounces towards both ends under its own elastic force. The end of the spiral blade 4 presses the top push plate 97 to drive the top push rod 95 and the first rack 10 to move in the air supply direction. The first rack 10 drives the second rack 101 to move in the direction away from the air supply through the third gear 102. The second rack 101 drives the backwashing plate 91 to move along the backwashing chamber 9 towards the direction close to the filter net 2 through the connecting rod. The backwashing plate 91 presses the air in the backwashing chamber 9 to be discharged from the one-way air outlet valve 93 on the air outlet plate 92, and backwashes the dust and impurities on the filter net 2. After the spiral blade 4 rotates past the top push plate 97, the top push plate 97 resets under the elastic force of the return spring 96. The top push plate 97 drives the top push rod 95 and the first rack 10 to reset. The first rack 10 drives the second rack 101 and the backwashing plate 91 to reset through the third gear 102. During the reset process of the backwashing plate 91, the air in the air supply duct 1 is sucked into the backwashing chamber 9 from the one-way air inlet valve 94, waiting for the next backwashing operation. Moreover, during the rotation of the filter net 2, the side of the dirt collection chamber 35 facing the rotation direction of the filter net 2 can scrape the stubborn impurities on the filter net 2, further improving the self-cleaning effect.

[0054] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0055] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations to the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A laboratory ventilation device, comprising an air supply duct and a filter screen, wherein the air supply direction is from left to right, and is characterized in that: A condensation cylinder is installed in the air supply duct, and the condensation cylinder is filled with a condensing agent. At least two spiral blades are arranged on the outer periphery of the condensation cylinder. A driving component for driving the spiral blade to rotate and a limiting component for limiting the spiral blade to follow the driving component to rotate are arranged in the air supply duct. A capture component is arranged on the right side of the spiral blade. A filter is arranged on the right side of the condensation cylinder. A sewage outlet is opened at the bottom of the air supply duct. When the limiting component limits one of the spiral blades to rotate with the driving component, the capture component on the rotating spiral blade cleans the dust and impurities on the stopped spiral blade, until the thrust force of the rotating spiral blade on the stopped spiral blade reaches a preset value, the stopped spiral blade follows the driving component to rotate again, and the spiral blade generating the thrust force is limited by the limiting component; The driving assembly includes a motor fixedly connected to the air supply duct and two mounting plates, the mounting plates are fixedly connected to the output shaft of the motor, the two mounting plates are symmetrically arranged at both ends of the condensing cylinder, and the two mounting plates are respectively provided with mounting grooves corresponding to the number of spiral blades on one side facing each other, and the two ends of the spiral blades are respectively connected to connecting rods extending into the mounting grooves; The mounting groove is an arc-shaped groove. When the limit assembly restricts the spiral blade from following the movement of the driving assembly, the connecting rod of the spiral blade is disengaged from the mounting groove. The limit assembly includes two guide blocks fixedly connected to the two ends of the condensing cylinder, the two guide blocks are symmetrically arranged, and the two guide blocks are respectively provided with guide surfaces on one side facing each other, the guide surfaces of the two guide blocks gradually tilt toward each other along the rotation direction of the spiral blade, and the limit blocks are elastically connected to the guide blocks, and the two ends of the spiral blade move along the corresponding guide surfaces, until the spiral blade abuts against the limit blocks, the connecting rod on the spiral blade is disengaged from the installation groove, and the connecting rod on the spiral blade that is pushed out of the guide blocks enters the installation groove; the position where the limit blocks are set on the guide surface is provided with a flat surface; The capture assembly comprises a main capture rod and a plurality of capture branches connected to the main capture rod. The main capture rod is fixedly connected to the spiral blade. The main capture rod and the capture branches are integrally formed and are both made of rubber.

2. The laboratory ventilation device according to claim 1, characterized in that A dirt collecting bin is provided on the right side of the condensing cylinder, and an opening corresponding to the dirt discharge port is provided at the bottom of the dirt collecting bin. The left side of the filter screen is fitted with the dirt collecting bin. A backflush assembly is provided on the condensing cylinder, and the backflush assembly is located on the right side of the filter screen and corresponds to the position of the dirt collecting bin. The filter screen is rotatably connected to the condensing cylinder, and a driving member 1 for driving the filter screen to rotate and a driving member 2 for driving the backflush assembly to backflush are provided on the condensing cylinder. A gap is provided between the dirt collecting bin and the filter screen on the side facing away from the rotation direction of the filter screen.

3. The laboratory ventilation device according to claim 2, characterized in that: The driving member 1 includes gear 1, gear 2, an incomplete gear and a ring gear. Gear 1 is fixedly connected to the output shaft of the motor, gear 2 is rotatably connected to the condensing cylinder, the incomplete gear is coaxially arranged and fixedly connected to gear 2, the ring gear is coaxially arranged and fixedly connected to the filter screen, gear 2 is meshed with gear 1, and the incomplete gear is meshed with the ring gear. The motor drives gear 1 to rotate, gear 1 drives gear 2 and the incomplete gear to rotate, and the incomplete gear drives the ring gear to drive the filter screen to rotate.

4. The laboratory ventilation device according to claim 2, characterized in that: The back-blowing assembly includes a back-blowing bin and a back-blowing plate slidably connected to the back-blowing bin along the air supply direction. The driving member 2 includes a driving part, a rack 1, a rack 2 and a gear 3. The condensing cylinder is fixedly connected to a mounting box. The rack 1 slides with the mounting box along the air supply direction. The rack 1 is fixedly connected to the driving part, the rack 2 is fixedly connected to the back-blowing plate, and the gear 3 is rotatably connected to the mounting box. The rack 1 and the rack 2 are respectively located on the lower side and the upper side of the gear 3 and are meshed with the gear 3. When the driving part drives the rack 1 to move, the rack 1 drives the rack 2 to move through the gear 3, and the rack 2 drives the back-blowing plate to move toward the direction close to the filter screen.

5. The laboratory ventilation device according to claim 4, characterized in that: The driving part includes a push rod and a reset spring. The push rod is slidably connected to the installation box along the air supply direction. A push plate is fixedly connected to the left side of the push rod. The reset spring is connected between the push plate and the installation box. Rack 1 is fixedly connected to the push rod. When the spiral blade is disengaged from the guide block and resets, the push plate is squeezed to drive the push rod and rack 1 to move.

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