Clean room negative pressure connection device capable of preventing pollution source overflow

Abstract

The application relates to the technical field of clean room negative pressure devices, in particular to a clean room negative pressure connection device capable of preventing pollution sources from overflowing, which comprises a negative pressure connection device box, a filter chamber and an exhaust chamber are arranged on the top of the inside of the negative pressure connection device box, beneficial effects are as follows: the filter chambers are symmetrically arranged on the two sides of the inside of the negative pressure connection device box, the exhaust chamber is used for connecting two U-shaped pipes, the filter chambers on the two sides are connected to perform negative pressure air extraction, the air baffle is arranged in the negative pressure connection chamber, the filter chamber needing to replace the filter element is closed, the gas in the clean room is prevented from leaking during the replacement of the filter element, the U-shaped pipe connected with the side is closed, the auxiliary air extraction pipe connected with the U-shaped pipe on the side continues to extract the residual air on the side into the filter chamber on the other side for filtration and discharge, the filter chamber on the side continues to keep the negative pressure state, and the pollution source is prevented from overflowing during the replacement of the filter element.

Description

Technical Field

[0001] This invention belongs to the technical field of cleanroom negative pressure devices, specifically relating to a cleanroom negative pressure connection device to prevent the overflow of pollution sources. Background Technology

[0002] A cleanroom is a sealed space where parameters such as air cleanliness, temperature, humidity, pressure, and noise are controlled. The pressure requirements within a cleanroom vary depending on the specific needs. For example, in electronics factories, a positive pressure is sufficient to ensure a clean working environment, while in other environments, a negative pressure is required to maintain cleanliness without polluting the surrounding environment, such as in infectious disease wards or operating rooms. For cleanrooms requiring negative pressure, the negative pressure connection device is a core component. This device mainly consists of a housing, filter components, and exhaust components. When the exhaust components are operating, the filter components filter the exhaust air before it is discharged. However, after prolonged use, the filter components may become clogged or lose their filtering effectiveness, thus affecting the negative pressure connection device's suction effect.

[0003] A Chinese patent document with publication number CN118089152B proposes a ventilation device with a purification structure for cleanrooms. This device solves the aforementioned technical problems by placing a filter monitoring mechanism at the top rear of the filter box. When the filter becomes severely clogged or gas leaks at pipe connections, an alarm can be issued to remind staff to perform maintenance. However, in this method, the machine needs to be stopped during filter replacement or maintenance. In this case, manual contact with the filter for replacement or maintenance may pose a risk of contamination spillage.

[0004] Therefore, this invention proposes a cleanroom negative pressure connection device to prevent pollution source leakage, solving the problem that pollution source leakage is easily caused when replacing filter elements in the prior art. By improving the filter box structure, designing a double filter chamber and double filter element, and with the installation components, it can ensure that when replacing the filter element on one side, the filter chamber on the other side remains in a negative pressure connection state. The negative pressure principle is used to prevent pollution source leakage and to achieve filter element replacement without stopping the machine. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a cleanroom negative pressure connection device to prevent the overflow of pollution sources, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cleanroom negative pressure connection device for preventing pollution source overflow, comprising a negative pressure connection device housing, an inspection plate fixedly installed on the outer surface of the negative pressure connection device housing by bolts, a filter chamber and an exhaust chamber arranged at the upper part of the interior of the negative pressure connection device housing, a negative pressure connection chamber arranged at the lower part of the interior of the negative pressure connection device housing, a front cover plate arranged on one side of the negative pressure connection device housing, a rear cover plate arranged on the other side of the negative pressure connection device housing, and a filter element arranged inside the filter chamber.

[0007] Preferably, the filter chambers are symmetrically arranged on both sides of the exhaust chamber. An exhaust fan is fixedly installed inside the exhaust chamber. A discharge pipe is fixedly installed at the output pipe end of the exhaust fan. A T-shaped pipe is fixedly installed at the input pipe end of the exhaust fan. U-shaped pipes are symmetrically fixedly installed at both ends of the T-shaped pipe. The two sets of U-shaped pipes pass through the inner wall of the rear cover plate.

[0008] Preferably, a central suction tube adapted to the position of the filter element is symmetrically fixedly installed on the inner surface of the rear cover plate. Suction inner sleeves are evenly distributed on the inner wall of the central suction tube. Two sets of U-shaped tubes penetrate the inner wall of the rear cover plate and are fixedly connected to the inner walls of the two sets of central suction tubes respectively. A control valve is provided at one end of the two sets of U-shaped tubes near the T-connector. An auxiliary suction tube is fixedly installed in the middle of the two sets of U-shaped tubes.

[0009] Preferably, negative pressure exhaust fans are symmetrically arranged on the top of the negative pressure connection chamber, ventilation grid plates are symmetrically fixedly installed on both sides of the top of the negative pressure connection chamber, the two sets of ventilation grid plates are respectively located below the two sets of filter chambers, air guide plates are symmetrically rotatably installed on the lower side wall of the negative pressure connection chamber, an arc-shaped air guide hood is fixedly installed in the middle of the top of the negative pressure connection chamber, adsorption magnetic plates are symmetrically fixedly installed on both sides of the negative pressure connection chamber, and adsorption magnetic plates are symmetrically fixedly installed on both sides of the arc-shaped air guide hood.

[0010] Preferably, a filter element mounting head is snapped onto one end of the filter element near the rear cover plate, a threaded rod is rotatably mounted between the inner surfaces of the front cover plate and the rear cover plate, the upper inner wall of the filter element mounting head is threadedly connected to the outer surface of the threaded rod, a filter element plugging head is snapped onto one end of the filter element near the front cover plate, and a valve groove is provided on the outer side of the filter element plugging head.

[0011] Preferably, the sidewall of the filter element mounting head is evenly distributed with an outer suction tube, which is sleeved on the outside of the inner suction tube, and both the outer suction tube and the inner suction tube have through holes on their sidewalls.

[0012] Preferably, a filter chamber sealing ring adapted to the position of the filter element sealing head is symmetrically fixedly installed on the inner surface of the front cover plate. A sealing valve is rotatably installed on the inner surface of the filter chamber sealing ring. A small gear is fixedly installed on the outer surface of the rotating shaft connecting the sealing valve and the filter chamber sealing ring. An internal gear ring is movably installed on the side wall of the filter chamber sealing ring. The inner surface of the internal gear ring meshes with the outer surface of the small gear. A telescopic rod is fixedly installed on the outer side of the filter chamber sealing ring.

[0013] Preferably, a sterile bag fitting adapted to the position of the filter element is symmetrically fixedly installed on the outer surface of the front cover plate. A sterile bag clamping ring is provided on the outside of the sterile bag fitting. The sterile bag clamping ring is fixedly installed on the outer surface of the front cover plate. A limiting groove is symmetrically opened on the inner side wall of the sterile bag clamping ring. A sealing gasket is movably installed inside the limiting groove. An adjusting ring is rotatably installed on the inner surface of the sterile bag clamping ring. An adjusting groove adapted to the sealing gasket is opened on the side wall of the adjusting ring. An adjusting gear is provided on one side of the adjusting ring.

[0014] Preferably, a filter element fixing ring is provided on the outside of the central suction pipe, and an adjusting ring is rotatably installed inside the filter element fixing ring. The side wall of the filter element fixing ring is symmetrically provided with limit grooves II, and a fixing block is movably installed inside the limit grooves II. The side wall of the adjusting ring is provided with an adjusting groove II that matches the fixing block. An adjusting gear II is rotatably installed on one side of the filter element fixing ring, and the outer surface of the adjusting gear II meshes with the outer surface of the adjusting ring. A reset spring is fixedly installed on the side wall of the filter element fixing ring, and a slot that matches the reset spring is provided on the side wall of the adjusting ring.

[0015] Preferably, a front baffle is provided on the outer side of the front cover plate, and a circular groove is provided in the middle of the front baffle plate; a rear baffle is provided on the outer side of the rear cover plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] By symmetrically arranging filter chambers on both sides inside the negative pressure connection device housing, and connecting two U-shaped pipes through the exhaust chamber to the filter chambers on both sides for negative pressure air extraction, and installing a guide plate inside the negative pressure connection chamber to seal the filter chamber that needs filter replacement, thus preventing gas leakage inside the clean chamber during filter replacement, and closing the U-shaped pipe connected to that side, the auxiliary exhaust pipe connected to that side continues to draw the residual air into the filter chamber on the other side for filtration and then discharge, so that the filter chamber on that side continues to maintain a negative pressure state, preventing the source of pollution from leaking out during filter replacement, solving the problem of easy leakage of the source of pollution when replacing filter elements in the existing technology, and realizing filter replacement without stopping the machine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall bottom view of the present invention;

[0020] Figure 3 This is a schematic diagram of the overall structure of the present invention after disassembly from one side;

[0021] Figure 4 This is a schematic diagram of the overall structure of the present invention after disassembly from the top.

[0022] Figure 5 This is a schematic diagram of the overall structure of the invention after disassembly on the other side;

[0023] Figure 6 This is a top view of the internal structure of the negative pressure connection device housing of the present invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the negative pressure connection device housing under normal operating conditions.

[0025] Figure 8 This is a schematic diagram of the internal structure of the side of the negative pressure connection device housing under filter replacement conditions.

[0026] Figure 9 This is a schematic diagram of the front structure of the left side of the negative pressure connection device housing in the state of replacing the filter element.

[0027] Figure 10 This is a side view of the negative pressure connection device housing in the case of filter replacement.

[0028] Figure 11 This is a schematic diagram of the overall structure of the two sets of filter elements and the exhaust chamber of the present invention;

[0029] Figure 12 This is a schematic diagram of the internal structure of the filter element of the present invention in the replacement state;

[0030] Figure 13 This is a schematic diagram of the filter element of the present invention under normal operating conditions;

[0031] Figure 14 This is a schematic diagram of the overall structure of a single filter element of the present invention;

[0032] Figure 15 This is a schematic diagram of the filter element replacement and installation state structure of the present invention;

[0033] Figure 16 This is a schematic diagram of the front cover plate of the present invention after one side is completely disassembled;

[0034] Figure 17This is a schematic diagram of the structure of the front cover plate of the present invention after the other side is completely disassembled.

[0035] In the diagram: 1. Negative pressure connection device housing; 11. Inspection panel; 12. Filter chamber; 121. Germicidal lamp; 13. Negative pressure connection chamber; 131. Ventilation grid plate; 132. Air guide plate; 1321. Adjusting rod; 133. Adsorption magnetic plate one; 134. Arc-shaped air guide hood; 1341. Adsorption magnetic plate two; 14. Negative pressure exhaust fan; 15. Exhaust chamber; 151. Exhaust fan; 152. Discharge pipe; 153. T-pipe; 154. U-shaped pipe; 155. Control valve; 156. Auxiliary exhaust pipe; 1561. Auxiliary control valve; 2. Front cover plate; 21. Sterile bag clamping ring; 211. Sterile bag connector; 212. Sealing gasket; 213. Adjusting ring; 2 131. Adjustment groove one; 214. Adjustment gear one; 215. Limiting groove one; 22. Front baffle; 23. Filter chamber sealing ring; 231. Sealing valve disc; 232. Pinion; 233. Internal gear ring; 234. Telescopic rod; 3. Rear cover plate; 31. Filter element fixing ring; 311. Adjustment ring; 3111. Adjustment groove two; 312. Adjustment gear two; 313. Fixing block; 314. Limiting groove two; 315. Reset spring; 32. Rear baffle; 33. Central suction pipe; 331. Suction inner sleeve; 4. Filter element; 41. Filter element mounting head; 411. Suction outer sleeve; 42. Threaded rod; 43. Filter element plug head; 431. Valve disc groove. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figures 1 to 8This invention provides a technical solution: a cleanroom negative pressure connection device for preventing pollution source overflow, comprising a negative pressure connection device housing 1, an inspection plate 11 fixedly installed on the outer surface of the negative pressure connection device housing 1 by bolts, a filter chamber 12 and an exhaust chamber 15 arranged at the upper part of the negative pressure connection device housing 1, a negative pressure connection chamber 13 arranged at the lower part of the negative pressure connection device housing 1, a front cover plate 2 arranged on one side of the negative pressure connection device housing 1, a rear cover plate 3 arranged on the other side of the negative pressure connection device housing 1, a filter element 4 arranged inside the filter chamber 12, the filter chambers 12 being symmetrically arranged on both sides of the exhaust chamber 15, and an exhaust fan 151 fixedly installed inside the exhaust chamber 15, the exhaust fan 151 outputting... A discharge pipe 152 is fixedly installed at one end of the pipe. A three-way pipe 153 is fixedly installed at the input pipe end of the exhaust fan 151. U-shaped pipes 154 are symmetrically fixedly installed at both ends of the three-way pipe 153. The two sets of U-shaped pipes 154 pass through the inner wall of the rear cover plate 3. A central suction pipe 33, which matches the position of the filter element 4, is symmetrically fixedly installed on the inner surface of the rear cover plate 3. Suction inner sleeves 331 are evenly distributed on the inner wall of the central suction pipe 33. The two sets of U-shaped pipes 154 pass through the inner wall of the rear cover plate 3 and are fixedly connected to the inner walls of the two sets of central suction pipes 33. A control valve 155 is provided at one end of each set of U-shaped pipes 154 near the three-way pipe 153. A control valve 155 is fixedly installed in the middle of each set of U-shaped pipes 154. An auxiliary exhaust pipe 156 is provided, with two sets of auxiliary exhaust pipes 156 staggered and distributed through the inner wall of the rear cover plate 3, respectively connecting to two sets of filter chambers 12. A negative pressure exhaust fan 14 is symmetrically arranged on the top of the negative pressure connection chamber 13. Ventilation grilles 131 are symmetrically fixedly installed on both sides of the top of the negative pressure connection chamber 13, with the two sets of ventilation grilles 131 located below the two sets of filter chambers 12. Air guide plates 132 are symmetrically and rotatably installed on the lower side wall of the negative pressure connection chamber 13. Adjustment rods 1321 for adjusting the air guide plates 132 are rotatably installed on the outer surface of the rear cover plate 3. An arc-shaped air guide hood 134 is fixedly installed in the middle of the top of the negative pressure connection chamber 13. Adsorption magnetic plates 13 are symmetrically and fixedly installed on both sides of the negative pressure connection chamber 13. 3. Adsorption magnetic plates 1341 are symmetrically fixed on both sides of the arc-shaped air guide shroud 134. A filter element mounting head 41 is snapped onto one end of the filter element 4 near the rear cover plate 3. A threaded rod 42 is rotatably installed between the inner surfaces of the front cover plate 2 and the rear cover plate 3. The upper inner wall of the filter element mounting head 41 is threadedly connected to the outer surface of the threaded rod 42. A filter element sealing head 43 is snapped onto one end of the filter element 4 near the front cover plate 2. A valve groove 431 is opened on the outer side of the filter element sealing head 43. An air extraction outer sleeve 411 is evenly distributed on the side wall of the filter element mounting head 41. The air extraction outer sleeve 411 is sleeved on the outside of the air extraction inner sleeve 331. Both the side walls of the air extraction outer sleeve 411 and the air extraction inner sleeve 331 are provided with through holes.

[0039] In this embodiment, before using the device, the negative pressure connection device housing 1 needs to be fixed to the top of the clean room. The installation position of the negative pressure exhaust fan 14 needs to be fixed to the clean room's exhaust port using flange welding. Under normal operating conditions, the air guide plate 132 unfolds to both sides. The air guide plate 132 is an iron plate, and its upper end is attracted by the magnetic adsorption plates 133 on both sides. At this time, the negative pressure exhaust fan 14 will exhaust the air inside the clean room into the negative pressure connection chamber 13, and then through the ventilation grille 131 into the filter chambers 12 on both sides. At this time, the control valve 155 is in the open state, and the auxiliary control valve 1561 is in the closed state. Both valve 55 and auxiliary control valve 1561 are electronic valves. The exhaust fan 151 operates by connecting two sets of U-shaped pipes 154 through a three-way pipe 153. The polluted gas inside the two filter chambers 12 is filtered through the filter element 4, then drawn into the central exhaust pipe 33 by the outer exhaust pipe 411 and the inner exhaust pipe 331. After being drawn out by the exhaust fan 151 through the U-shaped pipes 154, it is discharged through the exhaust pipe 152. The outer exhaust pipe 411 and the inner exhaust pipe 331 are fully connected to collect the air filtered by the filter element 4. Germicidal lamps 121 are installed on both sides of the filter chamber 12, and these lamps can be assisted by ultraviolet lamps for sterilization. Taking the replacement of the filter element in the left filter chamber 12 as an example, by rotating the adjusting rod 1321, the left air guide plate 132 is flipped so that it comes into contact with and is attracted by the adsorption magnetic plate 1341. At this time, the negative pressure exhaust fan 14 is still working normally, but the left ventilation grille 131 is closed and no polluted air enters. The polluted air is guided by the air guide plate 132 and the arc-shaped air guide hood 134 and enters the right filter chamber 12 through the right ventilation grille 131. Before the left air guide plate 132 is closed, the control valve 155 connected to the left side is closed, and the auxiliary control valve 1561 of the auxiliary exhaust pipe 156 connected to the U-shaped pipe 154 on this side is closed. When the filter is opened, the residual polluted air inside the left filter chamber 12 will continue to be introduced into the right filter chamber 12 through the auxiliary exhaust pipe 156, and will continue to be filtered by the filter element 4. Finally, it will be drawn out by the exhaust fan 151 through the U-shaped pipe 154 and the three-way pipe 153 and discharged through the discharge pipe 152. The left filter element can be replaced without stopping the machine. The working principle of replacing the filter element on the right side is the same as that on the left side, so it will not be described in detail. When replacing the filter element in the left filter chamber 12, because the air inside the filter chamber 12 is still continuously discharged through the auxiliary exhaust pipe 156 and the first half of the U-shaped pipe 154, the left filter chamber 12 is still under negative pressure. This can prevent the source of pollution from leaking out when replacing the filter element.

[0040] Example 2

[0041] Please see Figures 9 to 16Based on Embodiment 1, to ensure that the pollution source does not leak out through the replacement port when replacing a filter element on one side, this embodiment further proposes that a filter chamber sealing ring 23 adapted to the position of the filter element sealing head 43 is symmetrically fixedly installed on the inner surface of the front cover plate 2. A sealing valve disc 231 is rotatably installed on the inner surface of the filter chamber sealing ring 23. A small gear 232 is fixedly installed on the outer surface of the shaft connecting the sealing valve disc 231 and the filter chamber sealing ring 23. An internal gear ring 233 is movably installed on the side wall of the filter chamber sealing ring 23. The inner surface of the internal gear ring 233 meshes with the outer surface of the small gear 232. A telescopic rod 234 is fixedly installed on the outer side of the filter chamber sealing ring 23. The output end of the telescopic rod 234 is movably connected to the outer surface of the internal gear ring 233. Six sets of sealing valve discs 231 are provided, forming a ring. After the six sets of sealing valve discs 231 are engaged, they engage with the valve disc groove 431. A sterile bag fitting 211, which is adapted to the position of the filter element 4, is symmetrically fixedly installed on the outer surface of the plate 2. A sterile bag clamping ring 21 is provided on the outside of the sterile bag fitting 211. The sterile bag clamping ring 21 is fixedly installed on the outer surface of the front cover plate 2. A limiting groove 215 is symmetrically opened on the inner side wall of the sterile bag clamping ring 21. A sealing gasket 212 is movably installed inside the limiting groove 215. An adjusting ring 213 is rotatably installed on the inner surface of the sterile bag clamping ring 21. An adjusting groove 2131 adapted to the sealing gasket 212 is opened on the side wall of the adjusting ring 213. An adjusting gear 214 is provided on one side of the adjusting ring 213. The adjusting gear 214 is rotatably installed on the outer side wall of the sterile bag clamping ring 21. The outer surface of the adjusting gear 214 meshes with the outer surface of the adjusting ring 213. A fixing bolt is provided at one end of the adjusting gear 214. A bolt hole is provided on the outer surface of the front cover plate 2.

[0042] In this embodiment, according to Embodiment 1, taking the replacement of the filter element in the left filter chamber 12 as an example, before replacing the filter element, a sterile bag needs to be prepared. By rotating the left adjustment gear 214, the bolts of the adjustment gear 214 are mainly used to fix the adjustment gear 214 to keep it in a fixed state. By rotating the adjustment gear 214, the adjustment ring 213 can be rotated. Under the joint limiting cooperation of the adjustment groove 2131 and the limiting groove 215, the sealing gasket 212 will be driven by the adjustment groove 2131 to slide and unfold on the limiting groove 215 as the adjustment ring 213 rotates. At this point, one end of the sterile bag is fitted onto the outside of the sterile bag fitting 211. Then, the adjusting gear 214 is rotated in the opposite direction to reset the adjusting ring 213, clamping the bag opening. Then, the telescopic rod 234 on the corresponding side works to push the internal gear ring 233 to rotate, driving the six sets of small gears 232 to rotate synchronously, causing the sealing valve 231 to rotate and open. Then, rotating the threaded rod 42 can move the filter element installation head 41 as a whole, allowing the filter element sealing head 43 and the filter element 4 to slide out through the sterile bag fitting 211. The suction outer sleeve 411 and the suction inner sleeve 331 are connected. The sliding connection serves both as a limit and as a means to maintain suction with the cooperation of the exhaust fan 151, auxiliary exhaust pipe 156, central exhaust pipe 33, and inner exhaust sleeve 331, ensuring a negative pressure inside the filter chamber 12 and preventing leakage of contaminants. Finally, the filter element 4 is directly pulled out along with the filter element sealing head 43 using a sterile bag, the bag is tied tightly, and the entire filter element is stored inside the bag to prevent contaminant leakage. The adjusting gear 214 is then rotated again to unfold and loosen the sealing gasket 212, releasing the sterile bag. The sterile bag is then removed for subsequent centralized disinfection. After cleaning, remove a new filter element 4, assemble the new filter element plug 43 into place, and then install the new filter element 4 onto the filter element mounting head 41. Rotate the threaded rod 42 in the reverse direction to allow the replaced filter element 4 and filter element plug 43 to re-enter the filter chamber 12. Finally, the telescopic rod 234 drives the internal gear ring 233 to reset, causing the pinion 232 to rotate in the reverse direction and the sealing valve disc 231 to re-form a closed ring that engages with the valve disc groove 431 on the newly replaced filter element plug 43, thus completing the sealing process. The replacement of the filter element on the left side is now complete. The working principle of replacing the filter element on the right side is the same as that on the left side and will not be described in detail.

[0043] Example 3

[0044] Please see Figure 17Based on Embodiment 2, in order to make the overall installation of the filter element 4 more stable, this embodiment also proposes that a filter element fixing ring 31 is provided on the outside of the central air extraction pipe 33, an adjusting ring 311 is rotatably installed inside the filter element fixing ring 31, a second limiting groove 314 is symmetrically opened on the side wall of the filter element fixing ring 31, a fixing block 313 is movably installed inside the second limiting groove 314, an adjusting groove 3111 adapted to the fixing block 313 is opened on the side wall of the adjusting ring 31, an adjusting gear 312 is rotatably installed on one side of the filter element fixing ring 31, the outer surface of the adjusting gear 312 meshes with the outer surface of the adjusting ring 311, a reset spring 315 is fixedly installed on the side wall of the filter element fixing ring 31, a slot adapted to the reset spring 315 is opened on the side wall of the adjusting ring 311, a front baffle 22 is provided on the outside of the front cover plate 2, a circular groove is provided in the middle of the front baffle 22, and a rear baffle 32 is provided on the outside of the rear cover plate 3.

[0045] In this embodiment, the front baffle 22 is removable by bolts and mainly serves to protect the aseptic bag clamping ring 21. The rear baffle 32 is also removable by bolts and mainly protects the rear threaded rod 42, adjusting gear 2 312, and rotating parts of adjusting rod 1321. Before moving the filter element installation head 41, the adjusting gear 2 312 needs to be rotated first, causing the adjusting ring 311 to rotate a certain angle. At this time, the fixing block 313, under the limiting cooperation of the limiting groove 2 314, slides inside the limiting groove 2 314 because the adjusting ring 311 rotates and is driven by the adjusting groove 2 3111. The filter element mounting head 41 is locked in place. Once the filter element mounting head 41 is removed, the adjusting gear 312 is released. At this time, the adjusting ring 311 will reset with the cooperation of the reset spring 315. When installing the filter element mounting head 41, only the threaded rod 42 needs to be rotated. The end of the filter element mounting head 41 near the filter element fixing ring 31 is a conical frustum. After automatically lifting the fixing block 313, it automatically locks in place with the cooperation of the reset spring 315. The installation is simple. It cooperates with the sealing valve disc 231 to fix both ends of the filter element 4, making the overall installation of the filter element 4 more stable and maintaining the stability of the negative pressure device.

[0046] Example 4

[0047] Please see Figures 1 to 17 Based on Example 3, this example also proposes a method for using a cleanroom negative pressure connection device to prevent the overflow of pollution sources, including the following steps:

[0048] Step 1: Install the negative pressure connection device housing 1. Before using the device, the negative pressure connection device housing 1 needs to be fixed to the top of the clean room. Ensure that the installation position of the negative pressure exhaust fan 14 is fixed to the exhaust port position of the clean room by flange welding. Under normal working conditions, the air guide plate 132 unfolds to both sides. The negative pressure exhaust fan 14 will exhaust the air inside the clean room into the negative pressure connection chamber 13, and then enter the filter chambers 12 on both sides through the ventilation grid plate 131. At this time, the control valve 155 is in the open state and the auxiliary control valve 1561 is in the closed state. The exhaust fan 151 works by connecting two sets of U-shaped pipes 154 through the three-way pipe 153. The polluted gas inside the filter chambers 12 on both sides is filtered by the filter element 4, and then sucked into the central exhaust pipe 33 by the exhaust outer sleeve 411 and the exhaust inner sleeve 331. After being drawn by the exhaust fan 151 through the U-shaped pipe 154, it is discharged through the discharge pipe 152.

[0049] Step 2: After a period of use, the left filter element needs to be replaced. The control valve 155 connected to the left side is closed, and the auxiliary control valve 1561 of the auxiliary exhaust pipe 156 connected to the U-shaped pipe 154 on this side is opened. Rotate the adjusting rod 1321 to flip the left air guide plate 132 so that it contacts and is attracted to the adsorption magnetic plate 1341. The left ventilation grid plate 131 is closed, and no polluted air will enter the left filter chamber 12. The residual polluted air inside the left filter chamber 12 will be continued to be introduced into the right filter chamber 12 by the auxiliary exhaust pipe 156, and will continue to be filtered by the filter element 4 and discharged by the exhaust fan 151.

[0050] Step 3: Prepare the sterile bag. By rotating the adjusting gear 214 on the left, the sealing gasket 212 will slide and unfold on the limiting groove 215 as the adjusting ring 213 rotates. At this time, attach one end of the sterile bag to the outside of the sterile bag connector 211. Then, rotate the adjusting gear 214 in the opposite direction to reset the adjusting ring 213 and clamp the bag opening. Then, the telescopic rod 234 on the corresponding side will push the internal gear ring 233 to rotate, driving the six sets of small gears 232 to rotate synchronously, causing the sealing valve 231 to rotate and open. First, rotate the adjusting gear 312 to adjust... Rotating the ring 311 causes the fixing block 313 to slide inside the limiting groove 314, driven by the adjusting groove 3111. This releases the locking and fixing of the filter element mounting head 41. Rotating the threaded rod 42 allows the filter element mounting head 41 to move as a whole, allowing the filter element sealing head 43 and the filter element 4 to slide out through the sterile bag connector 211. The filter element 4 and the filter element sealing head 43 are then pulled out directly by wrapping the filter element 4 in a sterile bag. The bag opening is then tied tightly, and the entire filter element is put into the bag to prevent contaminants from leaking out. Rotating the adjusting gear 214 again causes the sealing gasket 212 to unfold and loosen its clamping on the sterile bag, allowing the sterile bag to be removed.

[0051] Step 4: Take out a new filter element 4, assemble the new filter element plug 43 into place, and install the new filter element 4 onto the filter element mounting head 41. Rotate the threaded rod 42 in the reverse direction to allow the replaced filter element 4 and filter element plug 43 to re-enter the filter chamber 12. Finally, the telescopic rod 234 drives the internal gear ring 233 to reset, causing the pinion 232 to rotate in the reverse direction and the sealing valve disc 231 to re-form a closed ring that engages with the valve disc groove 431 on the newly replaced filter element plug 43, thus completing the sealing process. The filter element replacement on the left side is now complete. The working principle for replacing the filter element on the right side is the same as that on the left side. Finally, close the auxiliary control valves 1561 on both sides and open the control valve 155. Then rotate the air guide plate 132 to restore normal working status.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cleanroom negative pressure connection device for preventing pollution source overflow, comprising a negative pressure connection device housing (1), wherein an inspection plate (11) is fixedly installed on the outer surface of the negative pressure connection device housing (1) by bolts, characterized in that: The upper part of the negative pressure connection device housing (1) is provided with a filter chamber (12) and an exhaust chamber (15). The lower part of the negative pressure connection device housing (1) is provided with a negative pressure connection chamber (13). A front cover plate (2) is provided on one side of the negative pressure connection device housing (1). A rear cover plate (3) is provided on the other side of the negative pressure connection device housing (1). A filter element (4) is provided inside the filter chamber (12).The filter chamber (12) is symmetrically arranged on both sides of the exhaust chamber (15). An exhaust fan (151) is fixedly installed inside the exhaust chamber (15). An exhaust pipe (152) is fixedly installed at the output pipe end of the exhaust fan (151). A three-way pipe (153) is fixedly installed at the input pipe end of the exhaust fan (151). U-shaped pipes (154) are symmetrically fixedly installed at both ends of the three-way pipe (153). The two sets of U-shaped pipes (154) penetrate the inner wall of the rear cover plate (3). A central exhaust pipe (33) adapted to the position of the filter element (4) is symmetrically fixedly installed on the inner surface of the rear cover plate (3). The inner wall of the air tube (33) is evenly distributed with an inner suction sleeve (331). The two sets of U-shaped tubes (154) pass through the inner wall of the rear cover plate (3) and are fixedly connected to the inner wall of the two sets of central suction tubes (33). The two sets of U-shaped tubes (154) are respectively provided with a control valve (155) at one end near the three-way pipe (153). The middle of the two sets of U-shaped tubes (154) is fixedly installed with an auxiliary suction pipe (156). The inner surface of the front cover plate (2) is symmetrically fixed with a filter chamber sealing ring (23) that matches the position of the filter element sealing head (43). The inner surface of the filter chamber sealing ring (23) is rotatably installed with a sealing ring. A sealing valve disc (231) is provided. A small gear (232) is fixedly installed on the outer surface of the rotating shaft connecting the sealing valve disc (231) and the filter chamber sealing ring (23). An internal gear ring (233) is movably installed on the side wall of the filter chamber sealing ring (23). The inner surface of the internal gear ring (233) meshes with the outer surface of the small gear (232). A telescopic rod (234) is fixedly installed on the outer side of the filter chamber sealing ring (23). A filter element fixing ring (31) is provided on the outside of the central suction pipe (33). An adjusting ring (311) is rotatably installed inside the filter element fixing ring (31). A limiting groove two (314) is symmetrically opened on the side wall. A fixing block (313) is movably installed inside the limiting groove two (314). An adjusting groove two (3111) adapted to the fixing block (313) is opened on the side wall of the adjusting ring (311). An adjusting gear two (312) is rotatably installed on one side of the filter element fixing ring (31). The outer surface of the adjusting gear two (312) meshes with the outer surface of the adjusting ring (311). A reset spring (315) is fixedly installed on the side wall of the filter element fixing ring (31). A groove adapted to the reset spring (315) is opened on the side wall of the adjusting ring (311).

2. The cleanroom negative pressure connection device for preventing pollution source overflow according to claim 1, characterized in that: The negative pressure connection chamber (13) is symmetrically provided with a negative pressure exhaust fan (14) at the top. Ventilation grid plates (131) are symmetrically fixed on both sides of the top of the negative pressure connection chamber (13). The two sets of ventilation grid plates (131) are respectively located below the two sets of filter chambers (12). The lower side wall of the negative pressure connection chamber (13) is symmetrically rotated and installed with an air guide plate (132). The top center of the negative pressure connection chamber (13) is fixedly installed with an arc-shaped air guide hood (134). The two sides of the negative pressure connection chamber (13) are symmetrically fixedly installed with an adsorption magnetic plate one (133). The two sides of the arc-shaped air guide hood (134) are symmetrically fixedly installed with an adsorption magnetic plate two (1341).

3. The cleanroom negative pressure connection device for preventing pollution source overflow according to claim 1, characterized in that: The filter element (4) is fitted with a filter element mounting head (41) at one end near the rear cover plate (3). A threaded rod (42) is rotatably installed between the inner surfaces of the front cover plate (2) and the rear cover plate (3). The upper inner wall of the filter element mounting head (41) is threadedly connected to the outer surface of the threaded rod (42). The filter element (4) is fitted with a filter element plug head (43) at one end near the front cover plate (2). A valve groove (431) is provided on the outer side of the filter element plug head (43).

4. The cleanroom negative pressure connection device for preventing pollution source overflow according to claim 3, characterized in that: The sidewall of the filter element mounting head (41) is evenly distributed with an air extraction outer sleeve (411), which is sleeved on the outside of the air extraction inner sleeve (331). Both the sidewall of the air extraction outer sleeve (411) and the air extraction inner sleeve (331) are provided with through holes.

5. A cleanroom negative pressure connection device for preventing pollution source overflow according to claim 1, characterized in that: The outer surface of the front cover plate (2) is symmetrically fixedly equipped with a sterile bag fitting (211) adapted to the position of the filter element (4). A sterile bag clamping ring (21) is provided on the outside of the sterile bag fitting (211). The sterile bag clamping ring (21) is fixedly installed on the outer surface of the front cover plate (2). A limiting groove (215) is symmetrically opened on the inner side wall of the sterile bag clamping ring (21). A sealing gasket (212) is movably installed inside the limiting groove (215). An adjusting ring (213) is rotatably installed on the inner side surface of the sterile bag clamping ring (21). An adjusting groove (2131) adapted to the sealing gasket (212) is opened on the side wall of the adjusting ring (213). An adjusting gear (214) is provided on one side of the adjusting ring (213).

6. A cleanroom negative pressure connection device for preventing pollution source overflow according to claim 1, characterized in that: A front baffle (22) is provided on the outer side of the front cover plate (2), and a circular groove is provided in the middle of the front baffle (22). A rear baffle (32) is provided on the outer side of the rear cover plate (3).

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