Ventilation plug for civil air defense engineering

Abstract

The utility model discloses a ventilation plug for civil air defense engineering in the field of ventilation plugs, which comprises a ventilation main pipe, a ventilation branch pipe bypasses the ventilation main pipe, main pipe flanges are arranged at the two ends of the ventilation main pipe, branch pipe flanges are arranged at the ends of the ventilation branch pipe, and sealing covers are in threaded connection with the peripheries of the branch pipe flanges. The sealing cover is provided with a sealing gasket corresponding to the end face of the branch pipe flange, and the sealing gasket is provided with an elastic plugging block corresponding to the ventilation branch pipe channel. According to the utility model, a dual-sealing mechanism of combining the sealing gasket with the plug-in plugging block is adopted, so that stronger impact can be borne, and sealing failure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ventilation plug, especially relates to a ventilation plug for civil air defense engineering. BACKGROUND

[0002] The ventilation plug is an important part of civil air defense equipment. The ventilation plug is generally arranged on the ventilation pipeline of the filter chamber in series with the filter absorber, and is used as a device for ventilation exchange in peacetime and wartime, so as to reduce the concentration of poisoning in the filter chamber. The ventilation plug comprises a detachable plug sealing plate. When it is necessary to reduce the concentration of poisoning, the plug sealing plate is opened to ventilate.

[0003] In the prior art, the sealing plate and the pipeline are connected by bolts to realize sealing. However, the sealing plate has the following disadvantages: a heavy overall blind plate flange needs to be installed to block the entire ventilation main pipe, which is complicated to operate, time-consuming, and needs to be operated by multiple people, thereby seriously affecting the emergency conversion efficiency in wartime. The traditional plane sealing has the risk of sealing failure under extreme working conditions. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a ventilation plug for civil air defense engineering, which adopts a double sealing mechanism of sealing gasket combined with plug-in sealing block, and can withstand strong impact.

[0005] The utility model is characterized in that the ventilation plug for civil air defense engineering comprises a ventilation main pipe, a ventilation branch pipe bypassing the ventilation main pipe, main pipe flanges arranged at both ends of the ventilation main pipe, a branch pipe flange arranged at the end of the ventilation branch pipe, a sealing cover threadedly connected to the outer periphery of the branch pipe flange, a sealing gasket arranged on the end face of the branch pipe flange corresponding to the sealing cover, and an elastic sealing block arranged in the ventilation branch pipe channel corresponding to the sealing gasket.

[0006] In use, the sealing cover is only needed to be tightened to reliably block the branch pipe in peacetime. When the reserved interface (such as a filter device) needs to be used in wartime, one sealing cover is only needed to be unscrewed, so that the standard branch pipe flange is exposed to be quickly connected. When the sealing cover is tightened, the sealing gasket is tightly attached to the end face of the branch pipe flange to provide the first sealing, and the sealing block is inserted into the inner cavity of the ventilation branch pipe to form a radial interference fit plunger sealing. When the shock wave acts on the pipe, the great pressure forces the sealing block to be more tightly attached to the pipe wall, instead of being blown away. Compared with the prior art, the utility model has the following advantages: the direct operation on the large main pipe in wartime is avoided, the conversion operation range is small, the conversion speed is fast, and one person can complete the conversion operation; the plug-in sealing block can provide certain structural support when bearing the internal pressure, thereby reducing the load on the sealing gasket; the double sealing structure of plane sealing and circumferential sealing greatly increases the sealing reliability, effectively prevents the instantaneous failure of the gasket or the leakage through the small gap caused by the shock wave pressure, and ensures the seamless compatibility with the civil air defense system through the design of the flange interface.

[0007] As a further improvement of the utility model, the air exchange main pipe comprises a reducing pipe tapered from the middle to both ends, and straight pipes are arranged at both ends of the reducing pipe respectively, and the main pipe flange is arranged at the outward end of the straight pipe.

[0008] As a further improvement of the utility model, the air exchange branch pipe is communicated with the largest diameter part of the reducing pipe.

[0009] As a further improvement of the utility model, the reducing pipe, the straight pipe and the main pipe flange are connected into one body through a welding process.

[0010] As a further improvement of the utility model, an outer thread is arranged on the outer periphery of the branch pipe flange, an inner thread is arranged on the inner wall of the sealing cover corresponding to the outer thread, and a stepped groove is arranged corresponding to the sealing gasket.

[0011] As a further improvement of the utility model, the plugging block is in a trapezoidal structure in cross section.

[0012] As a further improvement of the utility model, the sealing gasket and the plugging block are integrally manufactured from fluoro rubber or chloroprene rubber material.

[0013] As a further improvement of the utility model, a hand wheel is coaxially arranged on the outer side of the sealing cover. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model.

[0015] Figure 2 It is a structural schematic view of the utility model. Figure 1 It is a sectional view of A-A.

[0016] Figure 3 It is an enlarged view of A. Figure 2

[0017] Among them, 1 is an air exchange main pipe, 2 is an air exchange branch pipe, 3 is a main pipe flange, 4 is a branch pipe flange, 5 is a sealing cover, 6 is a sealing gasket, 7 is a plugging block, 8 is an outer thread, 9 is an inner thread, 10 is a stepped groove, 11 is a reducing pipe, 12 is a straight pipe, and 13 is a hand wheel. DETAILED DESCRIPTION

[0018] As Figures 1-3 ​As shown, it is a kind of air exchange head for civil air defense engineering, including air exchange main pipe 1, air exchange main pipe 1 bypass has air exchange branch pipe 2, air exchange main pipe 1 both ends are provided with main pipe flange 3, air exchange branch pipe 2 end is provided with branch pipe flange 4, branch pipe flange 4 periphery is connected with sealing cover 5 with screw thread, sealing cover 5 is provided with sealing pad 6 corresponding to the end surface of branch pipe flange 4, sealing pad 6 is provided with elastic plugging block 7 corresponding to the passage of air exchange branch pipe 2, preferably, the cross section of plugging block 7 is trapezoidal structure, which helps to guide plugging block 7 to be inserted more easily and aligned with the passage, improve the sealing effect; sealing pad 6 and plugging block 7 are integrally manufactured by fluorine rubber or chloroprene rubber material, which can improve the anti-tearing and deformation ability of the overall structure, and is not easy to fail in repeated compression or vibration environment.

[0019] In the embodiment, the outer periphery of the branch pipe flange 4 is provided with an external thread 8, and the inner wall of the sealing cover 5 is provided with an internal thread 9 corresponding to the external thread 8, and a stepped groove 10 is provided corresponding to the sealing pad 6.

[0020] The air exchange main pipe 1 includes a spindle-shaped variable diameter pipe 11 tapering from the middle to both ends, and a straight pipe 12 is arranged at both ends of the variable diameter pipe 11, and the main pipe flange 3 is arranged at the outward end of the straight pipe 12; because the middle section with the largest pipe diameter has the lowest flow rate and the highest static pressure, the air exchange branch pipe 2 is connected to the largest pipe diameter of the variable diameter pipe 11, and for the equipment (such as a filter in wartime) that needs to be pumped, high static pressure can significantly improve the pumping efficiency of the branch pipe, ensuring the rapid start and stable operation of the equipment; the variable diameter pipe 11, the straight pipe 12 and the main pipe flange 3 are connected by welding process, and because the pipe wall curvature at the largest pipe diameter is gentle, the welding stress is more evenly distributed when connecting the air exchange branch pipe 2, which can reduce the risk of local cracking.

[0021] In order to be compatible with the existing air exchange system and reduce downtime, the main pipe flange 3 and the branch pipe flange 4 can adopt standard flange design (such as common ANS or DIN standard); a hand wheel 13 is coaxially arranged on the outside of the sealing cover 5, and a small amount of human power is converted into high torque through the large-diameter hand wheel 13 (lever principle), and only one rotation action is needed to complete the locking / dismounting of the sealing cover 5; when the hand wheel 13 is rotated, the pressure is uniformly transmitted to the entire sealing pad 6, completely avoiding damage caused by eccentric load.

[0022] The advantages of the utility model lie in that: the trapezoidal plugging block 7 will produce progressive compression force when the sealing cover 5 is tightened, so that the pressure is evenly distributed on the sealing pad 6, avoiding failure caused by local stress concentration, and the trapezoidal design can also reduce friction loss and prolong the service life of the sealing element in repeated opening and closing operation; the spindle-shaped variable diameter pipe 11 has a symmetrical tapering structure, which facilitates smooth connection with the upstream and downstream straight pipes 12, and reduces local resistance.

[0023] The utility model discloses not limited to above embodiment, on the basis of the technical scheme disclosed in the utility model, the technical content disclosed in the utility model is not needed to make some substitution and deformation to some technical features among them according to the creative labor of the person skilled in the art, and these substitutions and deformations are all within the protection scope of the utility model.

Claims

1. A ventilation head for a civil air defense project, comprising a ventilation main pipe, a ventilation branch pipe bypassing the ventilation main pipe, and main pipe flanges arranged at both ends of the ventilation main pipe, characterized in that, The branch flange is provided with a sealing cover which is peripherally screwed, and the sealing cover is provided with a sealing gasket corresponding to the end face of the branch flange, and the sealing gasket is provided with an elastic plugging block corresponding to the branch flange passage.

2. The air change end piece for civil defense projects according to claim 1, characterized in that, The main pipe comprises a variable diameter pipe which is tapered from the middle to both ends, and both ends of the variable diameter pipe are provided with straight pipes, and the main pipe flange is arranged at the outward end of the straight pipe.

3. The air change end piece for civil defense projects according to claim 2, characterized in that The branch pipe is communicated with the largest diameter part of the variable diameter pipe.

4. The air change end piece for civil defense according to claim 2, characterized in that The variable diameter pipe, the straight pipe and the main pipe flange are connected as a whole through a welding process.

5. The air change end piece for civil defense projects according to claim 1, characterized in that, The outer periphery of the branch flange is provided with external threads, the inner wall of the sealing cover is provided with internal threads corresponding to the external threads, and a stepped groove is provided corresponding to the sealing gasket.

6. The air change end piece for civil defense projects according to claim 1, characterized in that The cross section of the plugging block is a trapezoidal structure.

7. The air change end piece for civil defense according to claim 1, characterized in that The sealing gasket and the plugging block are integrally manufactured by using fluorine rubber or chloroprene rubber material.

8. The ventilation plug of claim 1, wherein, The outer side of the sealing cover is coaxially provided with a hand wheel.

Images