RU2607609C1 - Recirculating air control valve - Google Patents

Abstract

FIELD: ventilation.

SUBSTANCE: invention relates to air ventilation and conditioning systems and can be used for creation of optimum microclimate parameters in rooms of administrative and office buildings. Recirculating air distributor includes static pressure chamber with outlet holes, external air branch pipe, recirculation air branch pipe with fan, wherein circuits of ambient air and recirculation air are separated in static pressure chamber, static pressure chamber additionally comprises filter, recirculation air outlet is equipped with swirler cells, and ambient air outlet is equipped with diffuser.

EFFECT: technical task of disclosed invention is formation of plenum jet, adhering onto ceiling, with optimum parameters and uniform temperature distribution along its cross-section while ensuring constant aerodynamic resistance in external air circuit at change of recirculation air flow rate.

1 cl, 2 dwg

Description

The invention relates to ventilation and air conditioning systems and can be used in rooms for various purposes.

There are many devices related to air distributors in which fresh air is mixed with air from a room in a mixing chamber and then enters the room (for example, GB No. 0724356, class F24F 1/01, publ. 2007; FI No. 200575226, class F24F 13/00, publ. 2007; EP No. 967444, class F24F 1/01, publ. 1999; FR No. 2817331, class F24F 13/26, publ. 2001; RU No. 2250419, class F24F 13/06, publ. . 2005, RU No. 2512073, class F24F 13/06, publ. 2012, and others).

Known air distributor (RU No. 2479798 C1, class F24F 13/06, publ. 2003), comprising a cylindrical casing with an air inlet slit made in its surface and with a diffuser mounted on the edges of the outlet in one of the ends of the casing, and the opposite end, near of which the air intake slit is made, is plugged, while the air duct is connected tangentially to the surface of the casing to the air inlet for connecting to the air conditioning system, and on the opposite side of the casing, another air receiving slit is made, located also near the muffled end of the casing, an air duct equipped with an axial fan in communication with the room is also connected tangentially to the surface of the casing, both air ducts being connected to the casing so that the air flows coming out of them in one direction are provided, while the fan motor connected to an automatic speed control system consisting of a frequency controller, a comparator and two air temperature sensors, one of which is installed at the air outlet from the air distributor, and the other is indoors.

Closest to the claimed technical solution is a known air distributor (RU No. 2479799, class F24F 13/06, publ. 2011), comprising a cylindrical body with adjustable guide vanes located in the outlet, and an axial fan is installed at its inlet in the side surface of the body a hole is cut out, equipped with a nozzle for connection to a supply duct, a hollow cylinder is placed coaxially with a gap from its inner surface inside the housing, the side surface of which is perforated between the sealing surface of the body and the edges of the ends of the cylinder are sealing annular partitions; the air distributor is equipped with a frequency regulator connected to an axial fan motor, two air temperature sensors are connected to the frequency regulator through a comparator, one of which is installed in the room, and the other is located at the air outlet from the guide vanes.

The disadvantages of these technical solutions are:

- change in aerodynamic drag in the network of outdoor air when changing the flow rate of recirculated air (air from the room);

- lack of purification of recirculated air (air from the room).

The technical task of the invention is the formation of a supply jet, which is laid on the ceiling, with optimal parameters and uniform distribution of temperature over its cross section, while ensuring constant aerodynamic drag in the external air circuit when the flow rate of recirculated air changes.

The problem is solved in that the recirculation air distributor contains a static pressure chamber with outlet openings, an outside air pipe, a recirculation air pipe with a fan installed therein, while the outdoor air and recirculation air circuits are separated in the static pressure chamber, the static pressure chamber further comprises a filter, the recirculation air outlet is provided with turbulence cells, and the outdoor air outlet equipped with a diffuser.

The invention is illustrated in more detail by the drawings and description thereof.

In FIG. 1 is a schematic sectional view of a recirculating air distributor, side view; in FIG. 2 - bottom view.

The recirculating air distributor contains a rectangular static pressure chamber 1, in the center of which there is an external air pipe 2 with an outlet equipped with a diffuser 3 (external air circuit). A recirculated air pipe 4 is supplied to the side of the static pressure chamber 1, inside of which a fan 5 is installed. On the front panel 6 of the static pressure chamber 1 there are exhaust openings for recirculated air - turbulence cells 7, a filter 8 for cleaning recirculated air is installed in front of the front panel 6 (circuit recirculation air).

Recirculating air distributor operates as follows.

Outside air with a reduced temperature (≥ + 6 ° C) from the air supply unit (not shown) is supplied to the pipe 2 and is sent to the room through the diffuser 3. The diffuser 3 forms a swirling jet laying on the ceiling, the flow of external air remains constant during the operation of the system. By means of a fan 5, recirculated air (room air) is supplied to the static pressure chamber 1 through the recirculated air pipe 4, which, passing through the filter 8, is cleaned and also sent through the turbulence cells 7 located on the front panel 6 of the air distributor. The turbulent cells 7 form a swirling stream of recirculating air that is laid on the ceiling, which is mixed with the outside air coming from the diffuser 3, forming supply air.

To maintain a given supply air temperature using a controller and a frequency drive (not shown), the fan speed 5 and, accordingly, the recirculation air flow are changed. The design of the recirculation air distributor provides for a maximum ratio of recirculation air to outdoor air consumption of 4: 1. The specified ratio allows you to maintain the optimal parameters of the air stream at the entrance to the working area of the premises of public buildings for various purposes at an outdoor temperature of at least + 6 ° C.

Rotatable plastic turbulence cells can individually be manually rotated in the plane of the panel by an angle of 360 degrees. Due to this, it is possible to achieve various air supply schemes on one product: from fan to direct-flow. In this case, the rotation of the cells does not affect the level of generated noise and does not change the loss of total pressure. Turbulent cells have a geometrically complex shape, which allows to increase the ejective abilities of the supply air.

Separation of the circuits of the external and recirculated air allows for the constancy of the aerodynamic drag in the circuit of the outdoor air when the flow rate of the recirculated air changes.

This design of the air distributor allows intensive damping of the rates of the supply jets and the reduction of temperature differences between the supply air and the room air.

Thus, the proposed recirculation air distributor is effective when used in ventilation and air conditioning systems with a constant flow of external air to assimilate internal heat surpluses by heating the outside air during cold and transitional periods of the year.

Claims (1)

A recirculating air distributor comprising a static pressure chamber with outlet openings, an outside air pipe, a recirculating air pipe with a fan installed therein, characterized in that the circuits of the outdoor air and recirculating air are separated in the static pressure chamber, the static pressure chamber further comprises a filter, an outlet for recirculation air is provided with turbulence cells, and the outlet for outdoor air is equipped with a diffuser .

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