Spring reset type air check valve

Abstract

The utility model provides a spring reset type check air valve which comprises a check air valve barrel and two semicircular blades, a horizontally arranged shaft is arranged in the check air valve barrel, the two ends of the shaft are connected with the side wall of the check air valve barrel, the diameter sides of the two semicircular blades are in an inverted-T-shaped upper protruding part shape, and the diameter sides of the two semicircular blades are connected with the side wall of the check air valve barrel. Two copper sleeves are fixed to the upper end face of the diameter side of the semicircular blade, the center axis of each copper sleeve is parallel to the diameter side, one copper sleeve is located on the end side of the diameter side, and the other copper sleeve is located on the side, away from the end side copper sleeve, of the protruding part and is adjacent to the protruding part. The protruding parts of the two semicircular blades are oppositely arranged, the shaft penetrates through the four copper sleeves and the spring, the spring is fixedly connected with the shaft and located over the protruding parts, and the two ends of a spring steel wire are perpendicular to the two axial sides respectively and extend to the two semicircular blades. The spring reset type non-return air valve has a non-return reset function, prevents wind and prevents fresh air from flowing backwards, the blades are flexible, and the valve body is stable in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of ship ventilation, and particularly relates to a spring-reset type non-return air valve. Background Art

[0002] The ship ventilation system is an important part of the ship system. In the LNG ventilation system, the exhaust pipes of the FGSS and TCS rooms need to be installed with a check valve to prevent the fresh air from flowing back into the room. How to prevent the wind coming down the air duct from not opening the air valve and ensure sealing so that the air valve does not lose its effect. Utility Model Content

[0003] In view of the above problems, the utility model provides a spring-reset check air valve with flexible blades and a stable valve body structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The cam is provided with a plurality of springs, each of which is connected to a pair of semicircular blades, each of which has a plurality of springs that are respectively connected to the two semicircular blades and a spring.

[0006] Furthermore, the blade seat is an annular blade seat, the outer diameter of the blade seat is the same as the inner diameter of the check valve cylinder, the upper end surface of the blade seat and the central axis of the shaft are located in the same horizontal plane, and the outer peripheral side wall of the blade seat is fixedly connected to the inner side wall of the check valve cylinder.

[0007] Furthermore, a blade limit plate is provided inside the check air valve cylinder, and the blade limit plate is located directly above the shaft, and is spaced apart from the shaft in parallel, and the horizontal center line of the blade limit plate and the central axis of the shaft are located in the same plane, and both ends of the blade limit plate are connected to the inner wall of the check air valve cylinder; the vertical distance between the semicircular blade and the lower end surface of the blade limit plate is 5 cm less than the radius of the semicircular blade.

[0008] Furthermore, the longitudinal section of the blade limiting plate is in an inverted right-angled U shape.

[0009] Furthermore, the rotation angle of each of the semicircular blades relative to the diameter of the check valve cylinder is 85°.

[0010] Furthermore, both ends of the check valve cylinder are connected to the air duct via flanges.

[0011] Furthermore, two through holes are oppositely formed on the side wall of the check valve cylinder, two through holes are penetrated at both ends of the shaft, threads are provided at both ends of the shaft, and the shaft is threadedly connected to the check valve cylinder through a nut.

[0012] The spring-reset check air valve device of the utility model is vertically installed before the exhaust fan of the ventilation duct and has a check return function to prevent the backflow of fresh air. When air is exhausted in the duct, the semicircular blades are opened to allow air to pass through. When there is no wind in the duct, the blades in the main body are closed and no wind passes through. A spring is arranged on the shaft in the cylinder of the check air valve to reset the blades. Blade seats are arranged around the blades to fully seal and improve the sealing performance. A blade limit plate is also arranged on the valve body to play a reset function to prevent the blades from overlapping and being unable to recover when the wind blows through. The blades of this check valve are flexible and the valve body structure is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a longitudinal sectional view of the spring return check air valve device described in the utility model;

[0014] Figure 2 yes Figure 1 Middle AA direction view;

[0015] Figure 3 It is a structural schematic diagram of the semicircular blade described in the utility model.

[0016] Among them, 1-check air valve cylinder, 2-flange, 3-semicircular blade, 4-copper sleeve, 5-annular blade seat, 6-blade limit plate, 7-shaft, 8-spring, 9-nut. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] like Figure 1-Figure 2As shown, a spring-reset check air valve comprises a check air valve cylinder 1 and two semicircular blades 3, both ends of the check air valve cylinder 1 are connected to the air duct through flanges 2, a horizontally arranged shaft 7 is provided inside the check air valve cylinder 1, and two through holes are relatively opened on the side wall of the check air valve cylinder 1, two through holes are penetrated at both ends of the shaft 7, and threads are provided at both ends of the shaft 7, and the shaft is screwed with the check air valve cylinder 1 through a nut 9; the diameter sides of the two semicircular leaves 3 are in the shape of the upper convex part of the word "convex", and two copper sleeves 4 are fixed on the upper end surface of the diameter side of the semicircular blade 3, and the central axis of the copper sleeve 4 is parallel to the diameter side, one of the copper sleeves 4 is located at the end side of the diameter side, and the other copper sleeve 4 is located on the side of the convex part away from the end side copper sleeve 4, and is arranged closely to the convex part; the convex parts of the two semicircular blades 3 are arranged oppositely, and the shaft is sequentially penetrated with four copper sleeves 4 and a spring 8, and the spring 8 is fixedly connected to the shaft 7, and the spring 8 is located just above the convex part, and the spring The two ends of the 8 steel wires extend perpendicularly to the axial sides to two semicircular blades 3. An annular blade seat 5 is provided below the semicircular blade 3. The outer diameter of the annular blade seat 5 is the same as the inner diameter of the check air valve cylinder 1. The outer peripheral side wall of the blade seat is fixedly connected to the inner side wall of the check air valve cylinder 1. When the blade is in a closed state, the lower end surface of the semicircular blade 3 is tightly arranged with the upper end surface of the annular blade seat 5; a blade limiting plate 6 is provided inside the check air valve body 1. The longitudinal section of the blade limiting plate 6 is an inverted right-angle U-shape. The blade limiting plate 6 is located directly above the axis 7 and is arranged parallel to the axis 7 at intervals. The horizontal center line of the blade limiting plate 6 and the center axis 7 line of the axis 7 are located in the same plane, and the two ends of the blade limiting plate 6 are connected to the inner side wall of the check air valve cylinder 1; the vertical distance between the semicircular blade 3 and the lower end surface of the blade limiting plate 6 is 5 cm less than the radius of the semicircular blade 3. The rotation angle of each semicircular blade 3 relative to the diameter of the check air valve cylinder 1 is 85°.

[0019] A person skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spring return check valve, characterized in that: The cam is provided with a plurality of springs, each of which is connected to a pair of side rails of the check valve body, and the springs are connected to the side rails of the check valve body at two ends. The cams are connected to the side rails of the check valve body at two ends. The cams are connected to the side rails of the check valve body at two ends. The cams are connected to the side rails of the check valve body at two ends. The cams are connected to the side rails of the check valve body at two ends.

2. A spring return check valve according to claim 1, characterized in that: The blade seat is an annular blade seat, the outer diameter of the blade seat is the same as the inner diameter of the check valve cylinder, the upper end surface of the blade seat and the central axis of the shaft are located in the same horizontal plane, and the outer peripheral side wall of the blade seat is fixedly connected to the inner side wall of the check valve cylinder.

3. A spring return check valve according to claim 1, characterized in that: A blade stop plate is provided inside the check air valve cylinder, the blade stop plate is located directly above the shaft, and is arranged parallel to the shaft and spaced apart, the horizontal center line of the blade stop plate and the central axis of the shaft are located in the same plane, and both ends of the blade stop plate are connected to the inner side wall of the check air valve cylinder; The vertical distance between the semicircular blade and the lower end surface of the blade limiting plate is 5 cm less than the radius of the semicircular blade.

4. A spring return check valve according to claim 3, characterized in that: The longitudinal section of the blade limiting plate is in an inverted right-angle U shape.

5. A spring return check valve according to claim 4, characterized in that: The rotation angle of each semicircular blade relative to the diameter of the check valve cylinder is 85°.

6. The spring return check valve according to claim 1, characterized in that: Both ends of the check air valve cylinder are connected to the air duct through flanges.

7. The spring return check valve according to claim 1, characterized in that: Two through holes are oppositely formed on the side wall of the non-return air valve cylinder, two through holes are penetrated at both ends of the shaft, threads are arranged at both ends of the shaft, and the shaft is screwed to the non-return air valve cylinder through a nut.

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