SK1792021U1 - Adjustable non-return damper - Google Patents

Abstract

Adjustable non-return damper operating on the principle of buoyancy force of the flowing air, where the supporting structure is formed by a base frame (1), in which the blades (2) are placed, which abut on the sealing surfaces (3). The blades (2) are placed in pairs against each other and are firmly connected to the pivot axes (4), which rotate in the base frame (1). Between the individual blades (2), there are the separating barriers (5) for separating the flowing air. A blade lever (6) with a weight (7) is firmly attached to the pivot axis (4), which creates a counterweight of the blade (2). The pairs of the blade levers (6) are connected by a connecting rod (8) to synchronize the movement of the pair of blades (2). On the connecting rod (8), there is an adjustable nut (11), a spring stop (12), a spring (13) and a spring nut (14), which adjusts the position of the spring (13) relative to the base frame (1). There is an adjustable distance between the adjustable nut (11) and the spring stop (12), which allows to adjust the deflection of the blade (2) during ventilation. The actuator (9) and a stop rod (10) limit the movement of the connecting rod (8), which makes it possible to block the selected pair of the blades (2) and to ensure the flow of air from or into the room.

Description

SK 179-2021 U1

Field of technology

The adjustable non-return valve belongs to the area of technical security of buildings, specifically to the area of heating, cooling and air-conditioning systems.

Prior art

Ensuring the flow of air in the air ducts and controlling its volume is a key task of air conditioning systems. It is also necessary to ensure the direction of flow, as in the case of air, the change in the pressure in the ventilated spaces or the influence of the external environment may cause the opposite flow as required. For this purpose, non-return dampers are used, which prevent air from flowing back into the ventilated room.

U.S. Pat. No. 3,403,616A describes a combination of a rain blind and an automatic backstroke damper. The rotating lamellas of the damper are combined with stationary louvre lamellas, which serve as automatic closing against the entry of rain, especially when it is driven by a strong wind into the fan. The damper leaves are mounted between the spaced louvers in such a way as to create pockets on the wind catcher for maximum efficiency of the automatic closing of the damper slats.

U.S. Pat. No. 3,908,529A discloses a backstroke damper which is constructed of two integral elements. The damper frame and blades are designed to eliminate the need for separate suspension elements while providing rotational movement of the vanes relative to the damper frame. This swivel hinge provides a reliable closed position seal and limits the rotation of the blades at an acute angle. The present invention also allows the installation of the device in combination with an exterior damper to ensure smooth operation in extreme weather conditions.

US9587845B2 discloses an exhaust fan having a cover mounted in a wall with an outlet duct extending through the wall to an outlet outside the wall. A damper is mounted on the fan. The mounting plate also includes a fume hood having an upper wall extending beyond the upper part of the damper and a downwardly facing front flange located parallel to the damper to the lower edge.

US10514181B2 discloses a backstroke with an improved airflow profile around the dampers. This device controls the direction of the air flow at the outlet and prevents the backflow of the air flow. The damper is equipped with a transverse opening allowing air to pass through the frame. One or more vanes pass through the frame and are mounted on the frame around the central portion by rotating members for rotation between the open and closed positions.

Patent document US2019346053A1 describes a self-sealing backstroke flap. The self-sealing non-return valve for completely stopping the return flow of air through the exhaust fans and the steam extractors comprises a housing with outlet openings and has at least one mounting opening. Inside the housing there is one conical tapered tube inclined with respect to the horizontal plane, which is airtightly attached to the base frame and forms a conical tapered inlet of the damper trough. There are holes for the tubular part inside the cover. The tube contains a ball closing member which is movable and closes, resp. opens a tapered tapered inlet. The axis of the conical tube can also be oriented vertically.

Patent document US2021018217A1 describes a non-return valve with counter-movement. The backstroke damper allows air to flow at the outlet and prevents airflow in the back-pull direction. Part of this device is a frame, the transverse opening of which allows the passage of air through the frame, then the vanes, each vane passing through the frame and being mounted to the frame around the central part by means of rotating members. In the closed position, the blade blocks the flow of air through the frame.

As can be seen from the prior art, most of the available non-return valves use only the principle of gravity to ensure the tightness of the pipe, i.e. the non-return valve closes with its own weight. The dampers are in some cases equipped with a counterweight if they are made of heavier materials.

The essence of the technical solution

The designed adjustable non-return valve combines the features of available non-return valves and, using lever mechanisms with springs, counterweights and a latch, not only prevents air backflow into the room, but also allows you to adjust the increased pressure, air overpressure in the room as needed. The adjustable flap consists of two pairs of opposite lamellas, while the two are connected into one kinematic unit by a connecting rod. The adjustable weight on the lamella lever serves to statically balance the lamella center of gravity. The connecting rod contains adjustable nuts and a spring stop, while the position and preload of the spring can be used to set the overpressure level in the room, or by moving the adjustable nut on the rod, the slats are without preload and open as soon as the air pressure in the room changes, which

SK 179-2021 U1 enables fast ventilation of rooms without increased need for energy on the ventilation, as the slats do not resist air flow. The actuator with the stop rod then blocks or releases the selected pair of slats by moving the rod, which makes it possible to ensure the flow out of the room, into the room, but also to completely stop the air flow.

Overview of figures in the drawings

In picture no. 1 shows a schematic section of an adjustable non-return valve, FIG. 2 is a perspective view of the functional parts of the adjustable non-return valve.

Examples of embodiments

The adjustable non-return valve is a separate assembly designed to control the air flow in a ventilated room. It works on the principle of the buoyancy force of the flowing air, the pressure of which exceeds the weight of the individual slats, while the slats are deflected and a ventilation opening is opened to remove air from the room. The supporting structure consists of a base frame 1, in which lamellae 2 are placed, which abut on the sealing surfaces 3. The lamellae 2 are placed in pairs against each other and are firmly connected to rotary axes 4 which rotate in the base frame L. Between the individual lamellae partitions 5 which separate the flowing air. A lamella lever 6 with a weight 7 is firmly attached to the pivot axis 4, which forms a counterweight of the lamella 2.

The pair of lamella levers 6 are connected by a connecting rod 8 which synchronizes the movement of the pair of lamellae 2. On the connecting rod 8 there is an adjustable nut 11, spring stop 12, spring 13 and spring nut 14 which adjusts the position of the spring 13 relative to the base frame. the stop 12 of the spring is an adjustable distance which allows to adjust the deflection of the lamella 2 during ventilation. By adjusting the spring nut 14, the spring preload is set, which is proportional to the pressure difference in the room. The actuator 9 and the stop rod 10 limit the movement of the connecting rod 8, which makes it possible to block the selected pair of lamellae 2 and to ensure the flow of air from or into the room.

Industrial applicability

The adjustable non-return valve can be used to supply and distribute air for the cooling needs of residential and office buildings.

SK 179-2021 U1

List of reference marks

- base frame

- lamella

3 - sealing surface

- rotary axis

- partition

- lamella lever

- weight

8 - connecting rod

- actuator

- stop rod

- adjustable nut

- spring stop

13 - spring

- spring nut

Claims (2)

SK 179-2021 U1 PROTECTION REQUIREMENTS An adjustable non-return valve operating on the principle of buoyancy force of the flowing air, consisting of a base frame (1) and lamellae (2) with sealing surfaces (3), characterized in that it comprises at least four lamellae (2) located in the base frame. (1) and abutting the sealing surfaces (3), wherein the lamellae (2) are placed in pairs against each other and are firmly connected to the rotary axes (4) rotatable in the base frame (1) and separating between the individual lamellae (2) partitions (5) for separating the flowing air, further that a lamella lever (6) with a weight (7) is firmly attached to each rotary axis (4) to form a counterweight of the lamella (2), the pairs of lamella levers (6) being connected by a connecting rod (8) for synchronizing the movement of a pair of lamellae (2), where on the connecting rod (8) there is an adjustable nut (11), a spring stop (12), a spring (13) and a spring nut (14) for adjusting the position of the spring (13) against the base frame (1), the connecting rod (8) being blocked or released a drawbar (10) which is controlled by an actuator (9) to ensure the flow of air from or into the room. Adjustable non-return valve according to Claim 1, characterized in that there is an adjustable distance between the adjustable nut (11) and the spring stop (12) for adjusting the deflection of the lamella (2) during ventilation. 2 drawings