CN211041349U - Airtight automatic opening and closing mechanism in ventilation pipe - Google Patents

Abstract

The utility model discloses a closed automatic opening and closing mechanism in a vent pipe, which comprises a connecting pipe (1), wherein a lower blade (6) is transversely fixed on the inner wall of the connecting pipe (1), a lower push rod via hole (601) is formed in the center of the lower blade (6), a sleeve (8) is fixed at the lower push rod via hole in the center of the lower surface of the lower blade (6), a solenoid valve (9) is installed at the lower end of the sleeve (8), a push rod (7) is installed on a push head of the solenoid valve (9), and the upper part of the push rod (7) passes through the lower push rod via hole (601) of the lower blade (6); an upper blade (4) is arranged above the lower blade (6), and the lobes of the upper blade (4) are complementary with the lobes of the lower blade (6), namely the lobes of the upper blade (4) and the lobes of the lower blade (6) can seal the plane. The automatic opening and closing mechanism for the sealing in the ventilation pipe achieves the purpose that the ventilation pipe of the collective protection device is automatically opened and closed under the conditions that the volume of the collective protection device is not increased and the weight is slightly increased.

Description

Airtight automatic opening and closing mechanism in ventilation pipe

Technical Field

The utility model belongs to the technical field of collective protector strains the poison ventilation, specifically is an airtight automatic opening closing mechanism in ventilation pipe.

Background

At present, the outlet and the inlet of the gas filtration ventilation pipe of the collective protection device are sealed by spinning rubber or extrusion rubber in a storage state, but most of the collective protection device is in an open state when in use, and the requirement of closing the seal at any time cannot be met. Some of the devices are additionally provided with closing devices outside the collective protection device, are connected with a ventilation pipeline, have complex mechanisms, and increase the length of the pipeline, so that the volume and the weight of the device are increased. The material of the toxin filtering layer is contacted with the air for a long time, so that the toxin filtering performance is easily reduced, and even the toxin filtering layer fails.

Disclosure of Invention

The utility model aims at providing a closed automatic opening and closing mechanism in a ventilation pipe, which utilizes a combined sealing structure of an upper blade and a lower blade to achieve the sealing effect of the ventilation pipe; the push rod is driven by the electromagnetic valve to do linear motion, and the blades are driven to do spiral descending and ascending motion by the spiral structural design of the push rod, so that the purposes of automatic opening and closing are achieved.

The utility model discloses an adopt following technical scheme to realize:

a closed automatic opening and closing mechanism in a vent pipe comprises a connecting pipe, wherein a lower blade is transversely fixed on the inner wall of the connecting pipe, a lower push rod through hole is formed in the center of the lower blade, a sleeve is fixed at the lower push rod through hole in the center of the lower surface of the lower blade, an electromagnetic valve is installed at the lower end of the sleeve, a push rod is installed on a push head of the electromagnetic valve, and the upper part of the push rod penetrates through the lower push rod through hole of the lower blade; an upper blade is arranged above the lower blade, and the lobes of the upper blade are complementary with the lobes of the lower blade, namely the upper blade and the lower blade can seal the plane; an upper push rod through hole is formed in the center of the upper blade, and a tooth groove is formed in the side wall of the upper push rod through hole; the side surface of the upper end of the push rod is provided with a section of thread helical tooth, when the upper part of the push rod passes through an upper push rod through hole of an upper blade, the thread helical tooth is matched with a tooth groove, the side surface of the upper part of the push rod is provided with a circle of limiting convex ring or is arranged in a step shape, and the upper blade is positioned above the limiting convex ring or the step; the upper end of the push rod is fixed with a gland, the gland is fixed with a plurality of springs around the push rod, and the lower ends of the springs abut against the upper blade.

Preferably, a layer of sealing material is arranged on the upper surface of the lower blade.

The working process is as follows: after receiving an opening instruction sent by a control center of the collective protection device, the electromagnetic valve drives the push rod to do upward linear motion, meanwhile, the spring at the upper end of the push rod drives the upper blade to rotate for a certain angle (namely, the leaves of the upper blade and the lower blade are partially or completely overlapped and a channel is opened) while moving downwards along the spiral structure, the spring extends to a certain degree, namely, the spring drives the upper blade to move downwards to a limiting convex ring or a step at the upper part of the push rod by virtue of the elasticity of the spring and then is positioned, after the push rod stops rising, a certain gap is formed between the upper blade and the lower blade because the upward movement stroke of the push rod is larger than the downward movement stroke of the upper blade, and; when a control center sends a closing instruction, the electromagnetic valve drives the push rod to do descending linear motion to drive the upper blade to descend to be closely attached to the lower blade, then the lower blade is attached to the lower blade along the push rod under the limitation of a spiral structure to do reverse rotation motion to a specified position (the blade of the upper blade and the blade of the lower blade close the section of the connecting pipe again), the reverse rotation motion of the upper blade enables the push rod to continue to move downwards for a certain stroke and then is finished, the spring is compressed, the upper blade is further attached to the lower blade, a certain compression amount of a sealing material is guaranteed, the sealing effect of a ventilation pipeline is achieved, and the mechanism is in a closed state.

Airtight automatic opening closing mechanism in the ventilation pipe under the condition that does not increase collective protector volume, weight increase a little, reach that collective protector ventilation pipeline is automatic to be opened, to close to and guarantee that collective protector strains the poison ventilation pipeline sealed under the off condition, guarantee to strain the sealed of poison unit under non-war user state, avoid the long-term and air contact of poison layer material, strain the poison performance and reduce or become invalid.

The utility model relates to a rationally, fine practical application is worth having.

Drawings

Fig. 1 shows a schematic cross-sectional view of the present invention.

Fig. 2 shows a schematic view of the upper blade structure.

Fig. 3 shows a schematic view of the lower blade structure.

In the figure: 1-connecting pipe, 2-gland, 3-spring, 4-upper blade, 401-upper push rod through hole, 402-tooth groove, 5-sealing material, 6-lower blade, 601-lower push rod through hole, 7-push rod, 701-limit convex ring, 702-thread helical tooth, 8-sleeve and 9-electromagnetic valve.

Detailed Description

The following describes in detail specific embodiments of the present invention with reference to the accompanying drawings.

An automatic closed opening and closing mechanism for the ventilation pipe is composed of casing, electromagnetic valve, upper and lower blades, push rod, spring, gland and sealing material.

As shown in fig. 1, the device comprises a connecting pipe 1, wherein a lower blade 6 is transversely fixed on the inner wall of the connecting pipe 1, a lower push rod through hole 601 (shown in fig. 3) is formed in the center of the lower blade 6, a sleeve 8 is fixed at the lower push rod through hole in the center of the lower surface of the lower blade 6, an electromagnetic valve 9 is installed at the lower end of the sleeve 8, a push rod 7 is installed on a push head of the electromagnetic valve 9, and the upper part of the push rod 7 penetrates through the lower push rod through hole 601 of the lower; an upper blade 4 is arranged above the lower blade 6, and the lobes of the upper blade 4 are complementary with the lobes of the lower blade 6, namely the lobes of the upper blade 4 and the lobes of the lower blade 6 can seal the plane; as shown in fig. 2, an upper push rod through hole 401 is formed in the center of the upper blade 4, and a tooth slot 402 is formed in the side wall of the upper push rod through hole 401; the side surface of the upper end of the push rod 7 is provided with a section of thread helical tooth 702, when the upper part of the push rod 7 passes through an upper push rod through hole 401 of the upper blade 4, the thread helical tooth 702 is matched with the tooth groove 402, the side surface of the upper part of the push rod 7 is provided with a circle of limiting convex ring 701, or the upper part of the push rod 7 is arranged in a step shape, so that the purpose of limiting the stroke of the lower blade is achieved, and the upper blade 4 is positioned above the limiting convex ring 701 (or the step; push rod 7 upper end is fixed with gland 2, and gland 2 is fixed with 2~3 springs 3 around push rod 7, and 3 lower extremes of spring lean on and lean on upper leaf 4.

When the upper blade 4 and the lower blade 6 are jointed in a closed state, the three lobes of the upper blade 4 and the three lobes of the lower blade 6 are staggered to close the section, and at the moment, the spring 3 is in a compressed state. When the opening stroke is carried out, the electromagnetic valve 9 acts to drive the push rod 7 to move upwards, the spring 3 pushes the upper blade 4 downwards to move downwards, due to the matching effect of the helical thread teeth 702 and the tooth grooves 402, the upper blade 4 rotates while moving downwards by 60-90 degrees, the spring 3 drives the upper blade 4 to move downwards until the upper limiting convex ring 701 of the push rod 7, and as the stroke of the push rod is greater than that of the upper blade moving downwards, a certain gap is formed between the upper blade 4 and the lower blade 6 after the opening is finished, and the lobe parts of the upper blade 4 and the lower blade 6 are partially or completely overlapped, so that an airflow channel is opened; when the closing stroke is carried out, the electromagnetic valve 9 acts to drive the push rod 7 to move downwards, the upper blade 4 is driven to move downwards to be in contact with the lower blade 6, then the push rod 7 continues to move downwards, the upper blade 4 and the lower blade 6 are in close contact and simultaneously spiral along the push rod 7 in the reverse direction, the push rod 7 stops moving after moving downwards for a certain stroke, and the spring 3 is further compressed. At this time, the upper blade 4 and the lower blade 6 are attached again in a sealed state.

In addition, the upper surface of the lower blade 6 can be provided with a layer of sealing material 5, so that better tightness between the upper blade 4 and the lower blade 6 is increased, but the pulling force when the push rod 7 moves downwards is obviously greater than the friction force between the upper blade 4 and the sealing material 5.

In specific implementation, the connecting pipe 1 is a toxin filtering ventilation pipeline, is made of metal materials, has good strength and is convenient to connect with the lower blade; the gland 2 is mainly used for positioning the distance between the upper blade and the lower blade after the blades are opened, and the upper blade and the lower blade are required to have a certain distance in an opening state through calculation of the local resistance of gas fluid, so that smooth air flow is ensured, and the structural resistance of the collective protection device is not influenced or the influence on the structural resistance is minimum; the elasticity of the spring 3 is matched with the driving force given to the push rod by the electromagnetic valve, and the upper blade and the lower blade are tightly matched in a closed state; the distance between the upper blade and the lower blade is equal to the distance between the upward movement stroke of the push rod and the downward movement stroke of the upper blade, the lower blade is made of metal materials and has good strength, the upper blade can also be made of metal materials and has certain strength, and under the pressure of the spring and the push rod, the upper blade and the sealing materials jointly act to enable the ventilation pipeline to form a closed space in a closed state, so that the air tightness requirement of the collective protection system is met; the sealing material is moderate in hardness and tensile strength and smooth, and ensures that the upper and lower blades are sealed under the pressure action of the spring and the push rod and the pipeline when the mechanism is in a closed state; the push rod moves up and down along the sleeve under the action of the electromagnetic valve, and the upper end of the push rod is in a spiral structure and drives the upper blade to move up and down in a spiral manner; the sleeve is used as a channel for the push rod to move up and down, and a certain degree of finish is required to be arranged inside the sleeve and is in clearance fit with the lower end of the push rod; the electromagnetic valve drives the push rod to move linearly up and down. According to the use characteristics and requirements of the sealed automatic opening and closing mechanism, the structure of the blade can be designed into three petals, and can also be designed into four petals or six petals according to the diameter of the toxin filtering ventilation pipeline.

The automatic opening and closing mechanism is characterized by structural design of an upper blade and a lower blade and spiral structural design of a push rod. The upper blade is a movable blade with a clamping groove, is tightly matched with the push rod and moves along with the push rod. The lower blade is a fixed blade and is fixed on the inner wall of the connecting pipe, dynamic balance is considered in the whole design, and the problems that the blades deform in the opening and closing processes or the sealing is not tight and the like are solved. The spiral design of the push rod needs to reasonably calculate the motion track of the upper blade, meet the characteristics of air flow distribution and avoid the phenomena of inaccurate positioning, overlarge air flow resistance and the like.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the protection scope of the claims of the present invention.

Claims (2)

1. The utility model provides a mechanism is closed to airtight automatic opening closing in ventilation pipe which characterized in that: the device comprises a connecting pipe (1), wherein a lower blade (6) is transversely fixed on the inner wall of the connecting pipe (1), a lower push rod through hole (601) is formed in the center of the lower blade (6), a sleeve (8) is fixed at the lower push rod through hole in the center of the lower surface of the lower blade (6), an electromagnetic valve (9) is installed at the lower end of the sleeve (8), a push rod (7) is installed on a push head of the electromagnetic valve (9), and the upper part of the push rod (7) penetrates through the lower push rod through hole (601) of the lower blade (6); an upper blade (4) is arranged above the lower blade (6), and the lobes of the upper blade (4) are complementary with the lobes of the lower blade (6), namely the lobes of the upper blade (4) and the lobes of the lower blade (6) can seal the plane; an upper push rod through hole (401) is formed in the center of the upper blade (4), and a tooth groove (402) is formed in the side wall of the upper push rod through hole (401); the side surface of the upper end of the push rod (7) is provided with a section of thread helical tooth (702), when the upper part of the push rod (7) passes through an upper push rod through hole (401) of an upper blade (4), the thread helical tooth (702) is matched with a tooth groove (402), the side surface of the upper part of the push rod (7) is provided with a circle of limiting convex ring (701) or is arranged to be step-shaped, and the upper blade (4) is positioned above the limiting convex ring (701) or the step; push rod (7) upper end is fixed with gland (2), gland (2) are fixed with a plurality of springs (3) around push rod (7), spring (3) lower extreme supports and leans on upper leaf (4).

2. The automatic opening and closing mechanism for the inner seal of the ventilation pipe as claimed in claim 1, wherein: and a layer of sealing material (5) is arranged on the upper surface of the lower blade (6).

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