Laboratory ventilation device

Abstract

The invention relates to the technical field of ventilation, and particularly discloses a laboratory ventilation device which comprises an air supply pipeline and a filter screen, the air supply direction is defined as conveying from left to right, a condensation barrel is installed in the air supply pipeline and filled with a condensing agent, and at least two spiral blades are arranged on the periphery of the condensation barrel. A driving assembly for driving the spiral blade to rotate and a limiting assembly for limiting the spiral blade to rotate along with the driving assembly are arranged in the air supply pipeline, a capturing assembly is arranged on the right side of the spiral blade, the filter screen is arranged on the right side of the condensation barrel, and a sewage draining exit is formed in the bottom of the air supply pipeline. According to the laboratory ventilation device, dust and impurities in air in the air supply pipeline can be adsorbed and intercepted, the capturing assembly can sweep the dust and impurities adsorbed on the spiral blade, and the spiral blade can scrape away the dust and impurities adsorbed on the outer wall of the condensation barrel when rotating; automatic cleaning of the spiral blade and the outer wall of the condensation barrel is achieved.

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; 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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 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. When the spiral blade abuts against the limit blocks, the connecting rod on the spiral blade slips out of the mounting groove, and the connecting rod on the spiral blade that is pushed out of the guide blocks enters the mounting groove.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Preferably, a flat surface is provided at the position where the limit block is provided on the guide surface.

[0022] The beneficial effects of the present invention are: (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. (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; (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

[0023] Figure 1 It is a cross-sectional view of a laboratory ventilation device of the present invention.

[0024] Figure 2 It is a schematic diagram of the internal structure of a laboratory ventilation device of the present invention.

[0025] Figure 3 The invention discloses a schematic structural diagram of a mounting plate and a guide block of a laboratory ventilation device.

[0026] Figure 4 yes Figure 2 A partial enlarged view of part A.

[0027] Figure 5 The invention discloses a schematic diagram of assembling a filter screen and a condensation cylinder of a laboratory ventilation device.

[0028] Figure 6 The present invention is a schematic diagram of the structure of a filter screen of a laboratory ventilation device.

[0029] Figure 7 The invention discloses a schematic structural diagram of a backflush assembly of a laboratory ventilation device.

[0030] 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.

[0031] Fig. 9 The invention discloses a cross-sectional view of a mounting plate and a condensing cylinder of a laboratory ventilation device during assembly.

[0032] Fig.10 The invention discloses a schematic diagram of assembling a spiral blade and a mounting plate of a laboratory ventilation device.

[0033] Reference numerals: 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

[0034] 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.

[0035] like Figures 1 to 10 As shown, and refer to Figure 1In the orientation shown in , 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 2. A condensation cylinder 3 is fixedly installed in the air supply duct 1. The condensation cylinder 3 is filled with a condensing agent. As an example, the condensation cylinder 3 can be set as a double-layer cylinder, and the condensing agent is filled in the interlayer formed by the double-layer cylinder to reduce the amount of condensing agent. Three spiral blades 4 are arranged on the periphery of the condensation cylinder 3. The inner periphery of the spiral blade 4 is in contact with the outer wall of the condensation cylinder 3, and the outer periphery is in contact with the inner wall of the air supply duct 1. A driving component for driving the spiral blade 4 to rotate relative to the condensation cylinder 3 and a limiting component for limiting the spiral blade 4 to rotate with the driving component are arranged in the air supply duct 1. A plurality of capture components are arranged on the right side of the spiral blade 4. The filter 2 is arranged on the right side of the condensation cylinder 3. A sewage outlet 11 is opened at the bottom of the air supply duct 1.

[0036] The air passes through the spiral channel formed by the spiral blades 4 and the condensation cylinder 3. When the air is relatively humid, condensation beads will form on the outer wall of the condensation cylinder 3 and the spiral blades 4. The condensation beads can absorb dust and impurities in the air, and the capture component can also intercept impurities such as lint in the air, which greatly reduces the dust and impurities contained in the air when it flows through the filter 2, ensures the smooth flow of the air supply duct 1, improves the air supply efficiency and quality, and improves the laboratory air environment.

[0037] like Figure 2 and Fig.10 As shown, with the orientation when looking at the mounting plate 7 from right to left as a reference, the driving assembly drives the spiral blade 4 to rotate clockwise, and when the limiting assembly limits one of the spiral blades 4 to rotate with the driving assembly, the capturing assembly on the rotating spiral blade 4 cleans the dust and impurities on the stopped spiral blade 4, until the thrust force of the rotating spiral blade 4 on the stopped spiral blade 4 reaches a preset value, the stopped spiral blade 4 follows the driving assembly to rotate again, and the spiral blade 4 that generates the thrust force is limited by the limiting assembly.

[0038] The dust impurities adsorbed on the spiral blade 4 are cleaned by the capture component, so that the dust impurities on the spiral blade 4 are more likely to fall from the spiral blade 4, and during the rotation of the spiral blade 4, the spiral blade 4 will push the fallen dust impurities to the sewage outlet 11 for discharge, thereby realizing automatic cleaning of the spiral blade 4. In addition, during the rotation of the spiral blade 4, the spiral blade 4 will scrape off the dust impurities adsorbed on the outer wall of the condensation cylinder 3, thereby ensuring the adsorption effect of the outer wall of the condensation cylinder 3, and also realizing automatic cleaning of the outer wall of the condensation cylinder 3.

[0039] like Figure 2 and Fig.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.

[0040] like Figures 1 to 4 as well as Figure 8 and Fig. 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 .

[0041] 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.

[0042] 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 disengage 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figure 5 and Figure 7As shown, the back-blowing assembly includes a back-blowing bin 9 and a back-blowing plate 91 slidably connected to the back-blowing bin 9 along the air supply direction. An air outlet plate 92 is fixedly connected to the back-blowing bin 9, and a one-way air outlet valve 93 is arranged on the air outlet plate 92. A one-way air inlet valve 94 is provided on the side of the air outlet plate 92 away from the filter 2. The second driving member includes a driving part, a rack 10, a rack 2 101 and a gear 3 102. The condensing cylinder 3 is fixedly connected to the mounting box 37. Since the condensing cylinder 3 is fixedly installed in the air supply duct 1 through the supporting structure 30, the mounting box 37 fixedly connected to the condensing cylinder 3 is also kept in a fixed state, and the filter 2 rotates relative to the mounting box 37. The baffle 38 is fixedly connected in the installation box 37, and the driving part includes a push rod 95 and a return spring 96. The push rod 95 is slidably connected to the baffle 38 of the installation box 37 along the air supply direction. The left side of the push rod 95 is fixedly connected to the push plate 97, and the return spring 96 is connected between the push plate 97 and the baffle 38. The rack 1 10 is fixedly connected to the push rod 95, and the rack 2 101 is fixedly connected to the back-blowing plate 91 through a connecting rod (not shown in the figure). The installation box 37 is provided with a movable groove 39 for the connecting rod to move. The gear 3 102 is rotatably connected to the installation box 37. The rack 1 10 and the rack 2 101 are respectively located at the lower side and the upper side of the gear 3 102, and are respectively meshed with the gear 3 102.

[0048] When the spiral blade 4 is disengaged from the guide block 31 and reset, it springs open to both ends under the action of its own elastic force, and the end of the spiral blade 4 squeezes the push plate 97 to drive the push rod 95 and the rack 1 10 to move in the air supply direction. The rack 1 10 drives the rack 2 101 to move away from the air supply direction through the gear 3 102, and the rack 2 101 drives the back-blowing plate 91 to move along the back-blowing bin 9 toward the filter screen 2 through the connecting rod. The back-blowing plate 91 squeezes the air in the back-blowing bin 9 from the one-way air outlet plate 92. The air outlet valve 93 discharges and back-blows the dust and impurities on the filter screen 2. After the spiral blade 4 rotates and passes over the push plate 97, the push plate 97 is reset under the elastic force of the reset spring 96, and the push plate 97 drives the push rod 95 and the rack 1 10 to reset. The rack 1 10 drives the rack 2 101 and the back-blow plate 91 to reset through the gear 3 102. During the reset of the back-blow plate 91, the air in the air supply duct 1 is sucked into the back-blow bin 9 from the one-way air inlet valve 94, waiting for the next back-blow operation. Moreover, during the rotation of the filter screen 2, the dirt collecting bin 35 facing the side of the filter screen 2 in the rotation direction can scrape off the stubborn impurities on the filter screen 2, further improving the self-cleaning effect.

[0049] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 defined as from left to right, and 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 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.

2. The laboratory ventilation device according to claim 1, characterized in that 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.

3. The laboratory ventilation device according to claim 2, characterized in that: The mounting groove is an arc-shaped groove. When the limiting component restricts the spiral blade from following the movement of the driving component, the connecting rod of the spiral blade is disengaged from the mounting groove.

4. The laboratory ventilation device according to claim 3, characterized in that: The limiting 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 blade, and the limiting blocks are elastically connected to the guide blocks, and the two ends of the spiral blade move along the corresponding guide surfaces. When the spiral blade abuts against the limiting blocks, the connecting rod on the spiral blade slips out of the mounting groove, and the connecting rod on the spiral blade that is pushed out of the guide blocks enters the mounting groove.

5. The laboratory ventilation device according to claim 4, 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.

6. The laboratory ventilation device according to claim 5, 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.

7. The laboratory ventilation device according to claim 5, 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.

8. The laboratory ventilation device according to claim 7, 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.

9. The laboratory ventilation device according to claim 1, characterized in that: 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 are made of rubber.

10. The laboratory ventilation device according to claim 4, characterized in that: A flat surface is arranged at the position where the limit block is arranged on the guide surface.

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