Flange type ventilation plug for civil air defense

Abstract

The utility model discloses a flange type ventilation plug for civil air defense in the field of ventilation plugs, which comprises a ventilation main pipe, a ventilation branch pipe is bypassed by the ventilation main pipe, main pipe flanges are arranged at two ends of the ventilation main pipe, branch pipe flanges are arranged at the end parts of the ventilation branch pipe, and sealing covers are arranged at ports corresponding to the branch pipe flanges. The sealing cover comprises a cover plate, a blocking column is arranged on the side, facing the branch pipe flange, of the cover plate, external threads are arranged on the periphery of the blocking column, a short guide sleeve is arranged at the end of a column body, a sealing gasket is arranged at the bottom of the short guide sleeve and corresponds to a ventilation branch pipe channel, and internal threads matched with the external threads are formed in the inner wall of the ventilation branch pipe. The outer threads and the inner threads are trapezoidal threads, wear-resistant coatings are sprayed on the surfaces of the outer threads and the inner threads, a sealing groove is formed in the end face, corresponding to the cover plate, of the branch pipe flange, and an elastic sealing ring is arranged in the sealing groove. The core requirements of civil air defense engineering for quick opening and closing, high sealing performance and wartime impact resistance of the ventilation plug are met.

Description

Technical Field

[0001] This utility model belongs to the technical field of ventilation plugs, and specifically relates to a flange-type ventilation plug for civil defense. Background Technology

[0002] Ventilation plugs play a vital role as a component of civil defense equipment. They are typically installed on the ventilation ducts connected in series with the filter absorber in the filtration chamber. These plugs serve as a device for exchanging ventilation during peacetime and wartime, reducing the concentration of contaminants in the filtration chamber. The ventilation plugs include a removable plug plate, which is opened to allow ventilation when a reduction in contaminant concentration is needed.

[0003] Traditional vent plugs are T-shaped, with all three ports secured to a blind flange by bolts. Their drawbacks include: the blind flange requires independent removal of multiple bolts, which is time-consuming and labor-intensive; the bolts are prone to corrosion when exposed to humid, dusty environments, and may strip or break during disassembly, necessitating cutting or drilling, significantly extending maintenance time. Utility Model Content

[0004] The purpose of this invention is to provide a flange-type ventilation plug for civil defense, which can open and close the branch pipe by simply rotating a single sealing cap without disassembling any bolts. It is particularly suitable for civil defense scenarios that require frequent inspections or emergency opening and closing.

[0005] The purpose of this utility model is achieved as follows: A flange-type ventilation plug for civil defense includes a main ventilation pipe, a branch ventilation pipe bypassing the main ventilation pipe, main pipe flanges at both ends of the main ventilation pipe, a branch pipe flange at the end of the branch pipe, a sealing cap corresponding to the port of the branch pipe flange, the sealing cap including a cover plate, a sealing post on the side of the cover plate facing the branch pipe flange, the sealing post having an external thread on its outer circumference, a short guide sleeve at the end of the post, a sealing gasket at the bottom of the short guide sleeve corresponding to the channel of the branch ventilation pipe, an internal thread adapted to the external thread on the inner wall of the branch ventilation pipe, both the external and internal threads being trapezoidal threads and coated with a wear-resistant coating, a sealing groove corresponding to the cover plate at the end of the branch pipe flange, and an elastic sealing ring in the sealing groove.

[0006] When using this invention, align the short guide sleeve at the end of the sealing column with the ventilation branch pipe opening, and gently push the sealing cap to allow the guide sleeve to smoothly enter the pipe opening for initial positioning; rotate the sealing cap to engage the external thread with the internal thread of the ventilation branch pipe; when the sealing gasket contacts the pipe opening end face, the first line of defense is formed, and the resistance increases slightly. Continue to tighten until the cover plate is completely fitted to the branch pipe flange end face. At this time, the elastic sealing ring is compressed, forming a second annular sealing line of defense on the flange contact surface; the fit accuracy of the trapezoidal thread and the wear-resistant coating help maintain a good fit clearance. Under pressure, the precise trapezoidal thread fit itself can also provide a certain auxiliary sealing effect.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: the trapezoidal thread can withstand greater axial and radial forces, and is not easily deformed or stripped under high pressure or accidental impact, which greatly improves the sealing reliability and overload resistance of the vent plug; the trapezoidal thread has relatively low friction during rotation and high axial force transmission efficiency, which makes the torque required to tighten and loosen the cover plate smaller and the operation more labor-saving; the trapezoidal thread itself has a strong tooth shape, and with the wear-resistant coating sprayed on the surface, it greatly improves the wear resistance of the thread pair and significantly extends the service life of the entire plug; the short guide sleeve can guide the sealing gasket to press accurately and smoothly against the sealing surface of the pipe, avoiding unilateral compression or jamming of the sealing gasket due to installation deviation, ensuring that the sealing gasket is evenly compressed and improving the pressure resistance limit.

[0008] As a further improvement of this utility model, the sealing ring has an I-shaped cross-section.

[0009] As a further improvement of this utility model, the sealing gasket and sealing ring are made of rubber or neoprene rubber.

[0010] As a further improvement of this utility model, the cover plate and the sealing post are manufactured as a single piece of metal material.

[0011] As a further improvement of this utility model, the main ventilation pipe includes a reducing pipe that gradually narrows from the middle to both ends, with straight pipes respectively provided at both ends of the reducing pipe, and the main pipe flange is provided at the end of the straight pipe facing outward.

[0012] As a further improvement of this utility model, the ventilation branch pipe is connected to the pipe at its maximum diameter point with the reducing pipe.

[0013] As a further improvement of this utility model, the reducing pipe, straight pipe and main flange are connected as one unit by welding.

[0014] As a further improvement of this utility model, a handwheel is coaxially provided on the outer side of the sealing cover. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 for Figure 1 Sectional view at point AA.

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0018] Among them, 1 is the main ventilation pipe, 2 is the branch ventilation pipe, 3 is the main pipe flange, 4 is the branch pipe flange, 5 is the sealing cap, 6 is the cover plate, 7 is the sealing column, 8 is the external thread, 9 is the short guide sleeve, 10 is the sealing gasket, 11 is the internal thread, 12 is the sealing groove, 13 is the sealing ring, 14 is the reducing pipe, 15 is the straight pipe, and 16 is the handwheel. Detailed Implementation

[0019] like Figure 1-3 As shown, a flange-type ventilation plug for civil defense applications includes a main ventilation pipe 1, with a branch ventilation pipe 2 bypassing the main ventilation pipe 1. Main ventilation pipe 1 has flanges 3 at both ends, and the branch ventilation pipe 2 has a branch pipe flange 4 at its end. A sealing cap 5 is located at the port of the branch pipe flange 4. The sealing cap 5 includes a cover plate 6. A sealing post 7 is located on the side of the cover plate 6 facing the branch pipe flange 4. The sealing post 7 has external threads 8 on its outer periphery, and a short guide sleeve 9 at its end. A sealing gasket 10 is located at the bottom of the short guide sleeve 9 corresponding to the channel of the branch ventilation pipe 2. The inner wall of the branch ventilation pipe 2 has internal threads 11 adapted to the external threads 8. Both the external threads 8 and the internal threads 11 are trapezoidal threads and are coated with a tungsten carbide wear-resistant coating, which can reduce wear caused by repeated screwing and extend the service life to more than 10 years. A sealing groove 12 is located on the end face of the branch pipe flange 4 corresponding to the cover plate 6, and an elastic sealing ring 13 is located within the sealing groove 12.

[0020] To reduce the risk of leakage, the cross-section of the sealing ring 13 is preferably of an I-shape. When the pressure inside the pipeline increases, the flange of the I-shaped sealing ring 13 expands outward under the action of fluid pressure, and fits more tightly with the side wall of the sealing groove 12, forming a passive self-tightening seal to cope with the overpressure conditions of shock waves.

[0021] The sealing gasket 10 and sealing ring 13 are made of rubber or neoprene rubber, which have good elastic modulus. When compressed, the deformation can fully fill the microscopic unevenness between the flange end face of the ventilation branch pipe 2 and the sealing cover 5, eliminating the leakage path. They have excellent resistance to wartime disinfectants, mold or pipeline condensate, and prevent the seal from swelling or degrading.

[0022] The cover plate 6 and the sealing column 7 are manufactured as a single piece of metal material. There is no assembly gap between the cover plate 6 and the sealing column 7, which eliminates the micro-leakage path caused by thermal expansion and contraction or corrosion in the split structure. Combined with the end face compression seal of the I-shaped sealing ring 13, a double barrier of "metal rigid locking combined with elastic sealing" is formed.

[0023] The main ventilation pipe 1 includes a reducer pipe 14 that gradually narrows from the middle to both ends. Straight pipes 15 are respectively installed at both ends of the reducer pipe 14, and the main pipe flange 3 is installed at the outward end of the straight pipe 15. The ventilation branch pipe 2 is connected to the part with the largest diameter of the reducer pipe 14, where the fluid static pressure is the highest and the flow velocity is the lowest. According to Bernoulli's principle, this is conducive to the efficient extraction of toxic gases by the ventilation branch pipe and avoids the decrease in extraction efficiency due to insufficient negative pressure. Considering that it is used for a long time in the high humidity and disinfectant environment of the filter room, the reducer pipe 14, the straight pipe 15 and the main pipe flange 3 are connected into one piece by welding.

[0024] A handwheel 16 is coaxially arranged on the outer side of the sealing cover 5. The edge of the handwheel 16 is provided with symmetrical anti-slip texture, which can increase the friction and ensure stable force application even in wet conditions or when wearing gloves.

[0025] The advantages of this utility model are as follows: the end face of the branch flange 4 is provided with a sealing groove 12 and an elastic sealing ring 13, and when the cover plate 6 is pressed, a static seal is formed, which effectively blocks the infiltration of external gas; the sealing gasket 10 at the end of the sealing column 7 fits with the bottom of the ventilation branch pipe 2 channel to form an axial seal, and at the same time, the tight engagement of the trapezoidal thread provides a radial seal, which can provide a double barrier to ensure special requirements such as protection against poison gas and shock waves during wartime.

[0026] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A flange type air exchange plug for civil air defense, comprising an air exchange main pipe, the air exchange main pipe being bypassed by an air exchange branch pipe, and main pipe flanges being arranged at both ends of the air exchange main pipe, characterized in that, The ventilation branch pipe is provided with a branch pipe flange at its end, and a sealing cover is provided at the port of the branch pipe flange. The sealing cover includes a cover plate, and a sealing post is provided on the side of the cover plate facing the branch pipe flange. The sealing post has an external thread on its outer circumference, and a short guide sleeve is provided at the end of the post. A sealing gasket is provided at the bottom of the short guide sleeve corresponding to the ventilation branch pipe channel. The inner wall of the ventilation branch pipe has an internal thread adapted to the external thread. Both the external thread and the internal thread are trapezoidal threads and are coated with a wear-resistant coating. A sealing groove is provided on the end face of the branch pipe flange corresponding to the cover plate, and an elastic sealing ring is provided in the sealing groove.

2. The flange type air exchange plug for civil air defense according to claim 1, characterized in that, The sealing ring has an I-shaped cross-section.

3. The flange type air exchange plug for civil air defense according to claim 1, characterized in that, The sealing gasket and sealing ring are made of rubber or neoprene rubber.

4. The flange type air exchange plug for civil air defense according to claim 1, characterized in that, The cover plate and sealing post are manufactured as a single piece of metal.

5. The flange type air exchange plug for civil air defense according to claim 1, characterized in that, The main ventilation pipe includes a reducing pipe that gradually narrows from the middle to both ends, with straight pipes at both ends of the reducing pipe, and the main pipe flange is located at the outward-facing end of the straight pipe.

6. The flange type air exchange plug for civil air defense according to claim 5, characterized in that, The ventilation branch pipe is connected to the reducer at its maximum diameter.

7. The flange type air exchange plug for civil air defense according to claim 5, characterized in that, The reducing pipe, straight pipe, and main flange are connected as one unit by welding.

8. The flange type air exchange plug for civil defense according to claim 1, wherein A handwheel is coaxially mounted on the outside of the sealing cover.

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