SK9543Y1 - 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 9543 Υ1

The field of technology

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

Current state of the art

Ensuring the flow of air in air ducts and controlling its quantity is the key task of air-conditioning systems. It is also necessary to ensure the direction of the flow, as the air may change the pressure in the ventilated spaces or due to the influence of the external environment to the opposite flow than desired. For this purpose, non-return valves are used, which prevent the backflow of air into the ventilated room.

Patent document US3403616A describes a combination of a rain blind and an automatic recoil damper. The rotating slats of the flap are combined with the stationary slats of the blinds, which serve as automatic closing against the entry of rain, especially when it is driven by strong wind into the fan. The damper blades are mounted between the spaced louvres in such a way as to create wind-trapping pockets for maximum efficiency of the automatic closing of the damper slats.

Patent document US3908529A describes a recoil damper that is constructed from two integral elements. The damper frame and leaves are designed to eliminate the need for separate suspension elements, while providing rotational movement of the vanes relative to the damper frame. This pivoting hinge provides reliable sealing of the closed position and limits the rotation of the vane placement to an acute angle. The present invention also allows the installation of the device in combination with an exterior muffler to ensure smooth operation in extreme weather conditions.

Patent document US9587845B2 describes an exhaust fan having a housing mounted in a wall with an outlet pipe passing through the wall to an outlet outside the wall. A damper is mounted on the fan. The mounting plate also includes a hood with an upper wall extending over the upper part of the flap and a downward facing front flange located parallel to the flap towards the lower edge.

Patent document US10514181B2 describes a reverse thrust damper with an improved airflow profile around the flaps. This device controls the direction of the air flow at the outlet and prevents the back draft of the air flow. The shock absorber is equipped with a transverse hole 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 pivoting members for rotation between open and closed positions.

Patent document US2019346053A1 describes a self-sealing check valve. A self-sealing check valve to completely stop backflow of air through exhaust fans and hoods includes a housing with outlet openings and has at least one mounting hole. Inside the housing there is one conical tapered tube inclined with respect to the horizontal plane, which is air-tightly attached to the base frame and forms the conical tapered inlet of the shock absorber trough. There are holes on the tubular part inside the cover. The tube contains a spherical closing member, which is movable and closes, or opens a conical tapered inlet. The axis of the conical tube can also be oriented vertically.

Patent document US2021018217A1 describes a check valve with counter-directional movement. The backdraft damper allows the flow of air at the outlet and prevents the flow of air in the direction of the backdraft. This device includes a frame, the transverse opening of which allows air to pass through the frame, then vanes, each vane passing through the frame and mounted to the frame around the central part by means of pivot members. In the closed position, the vane blocks the flow of air through the frame.

As can be seen from the current state of the art, most of the available non-return valves use only the gravity principle to ensure the tightness of the pipeline, i.e. the non-return valve closes with its own weight. In some cases, flaps are 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 properties of available non-return valves and, using lever mechanisms with springs, counterweights and a latch, not only prevents backflow of air into the room, but also allows the setting of increased pressure, excess air pressure in the room as needed. The adjustable damper consists of two pairs of opposite lamellas, each of which is connected to a single kinematic unit by a connecting rod. The adjustable weight on the slat lever is used for

SK 9543 Υ1 static alignment of the center of gravity of the lamella. The connecting rod contains adjustable nuts and a stop with a spring, while the position and pretension of the spring can be used to adjust the level of excess pressure in the room, or by moving the adjustable nut on the rod, the slats are without pretension and open immediately when the air pressure in the room changes, which enables quick ventilation of the room without increased need for energy for ventilation, as the slats do not resist air flow. The actuator with the stop puller subsequently blocks or releases the selected pair of slats by moving the puller, 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 images on drawings

In picture no. 1 shows a schematic section of an adjustable check valve, and figure no. 2 shows a three-dimensional view of the functional parts of the adjustable check valve.

Implementation examples

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 buoyant force of the flowing air, the pressure of which overcomes the weight of the individual slats, causing the slats to deflect and opening the ventilation hole to remove air from the room. The supporting structure consists of a base frame 1, in which slats 2 are located, which rest on sealing surfaces 3. The slats 2 are placed opposite each other in pairs and are firmly connected to pivot axes 4, which rotate in the base frame 1. Between individual slats 2 are partition walls 5 that separate the flowing air. The lever 6 of the lamella with the weight 7, which creates the counterweight of the lamella 2, is firmly attached to the rotating axis 4.

Pairs of levers 6 slats are connected by a connecting rod 8, which synchronizes the movement of a pair of slats 2. On the connecting rod 8 there is an adjustable nut 11, a stop 12 of the spring, a spring 13 and a nut 14 of the spring, which sets the position of the spring 13 against the base frame 1. Between the adjustable nut 11 and the stop 12 of the spring is an adjustable distance that allows you to adjust the deflection of the slat 2 during ventilation. By adjusting the spring nut 14, the preload of the spring 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 slats 2 and ensure the flow of air from the room 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 spaces in buildings.

SK 9543 Υ1

List of relationship tags

- basic frame

- lamella

- sealing surface

4 - rotary axis

- partition

- slat lever

- weight

- connecting rod

9 - actuator

- stop rod

- adjustable nut

- spring stop

- spring

14 - spring nut

Claims (2)

SK 9543 Υ1 CLAIMS FOR PROTECTION 1. Adjustable check valve operating on the principle of buoyant force of flowing air, consisting of a basic frame (1) and slats (2) with sealing surfaces (3), characterized by the fact that it contains at least four slats (2) located in the basic frame ( 1) and resting on the sealing surfaces (3), 5, while the slats (2) are placed opposite each other in pairs and are firmly connected to the pivot axes (4) rotating in the base frame (1) and between the individual slats (2) there are separating partitions (5) to separate the flowing air; a lever (6) of a slat with a weight (7) is firmly attached to each rotating axis (4) to create a counterweight of the slat (2), while pairs of levers (6) of slats are connected by a connecting rod (8) to synchronize the movement of a pair of slats (2) , where on the connecting rod (8) there is an adjustable nut (11), stop 10 (12) of the spring, spring (13) and nut (14) of the spring for adjusting the position of the spring (13) against the base frame (1), while the connecting rod ( 8) is blocked or released by the stop puller (10), which is controlled by the actuator (9) to ensure air flow from or to the room. 2. Adjustable check valve according to claim 1, characterized in that there is an adjustable distance between the adjustable nut (11) and the stop (12) of the spring to adjust the deflection 15 of the slat (2) during ventilation. 2 drawings