ES2314861T3 - INTERIOR UNIT OF A CONDITIONING AIR EQUIPMENT. - Google Patents

Abstract

Indoor unit (1) of an air conditioning unit consisting of a hollow housing (2) essentially rectangular rectangular parallelepipedic provided with two holes for the entry (18) and exit (19) of the air, respectively, which houses inside at least one filter element (3), at least one heat exchanger (4) and a centrifugal fan (5) that sucks, through the inlet hole, the air from the comfort zone of a room to the surfaces of the heat exchanger and returns it, through the exit orifice, to the mentioned comfort zone, the indoor unit comprising a dividing element (6) that separates the housing into two transverse cavities, one of aspiration (1a) and one of discharge (1b), and is provided with an opening (11) for the passage of air from one cavity to another; the fan being provided in said opening of the dividing element, so that its axis of rotation is essentially arranged perpendicular to the larger faces of the housing, said opening constituting the entrance to the aspiration ear (7) of the fan; and the heat exchanger being located on either side of the fan, always outside the projection, axially, of the ear of aspiration thereof, characterized in that the relationship between the diameter (D) of the impeller (8) of the fan and the discharge height (h) of the fan blades (9) follows the ratio: D / h> _ 5.5 and because the stator (10) of the fan motor (12) is housed inside a casing housing (13) located in the suction ear (7) of the fan, fixed to one of the larger faces of the hollow housing (2) of the indoor unit.

Description

Indoor unit of an air equipment conditioned.

Technical sector of the invention

The invention relates to an indoor unit of an air conditioning unit consisting of a housing hollow provided with two holes for the entrance and exit of the air, respectively, which houses at least one heat exchanger and a fan that sucks, through the entrance hole, the air of the comfort zone of a room up to the heat exchanger surfaces and return it, to through the exit hole, to the mentioned comfort zone.

Background of the invention

The indoor units of air equipment known conditioners consist of an outer shell,  as a closet, provided with a grid or hole for air inlet preferably located in the equipment intended to be installed horizontally or vertically, at the bottom and an air vent or outlet located in one part front of the housing. These units further comprise a heat exchanger generally constituted in the equipment to provide cold, by an evaporator that cools the air that penetrates the housing through the heat grid of evaporation of a refrigerant. A fan housed in the Inside the housing is responsible for sucking the air from the stay, direct it on in unit heat exchanger inside and eject it outwards through the grid of outlet or ducts.

An example of the indoor unit of a computer air conditioning is described in WO 3033965. The unit housing is provided with a front hole or grid that extends horizontally, behind which is located inside the housing, a tangential fan that aspirates and expels the air in a tangential direction with respect to its axis rotation. This type of fans, whose axis of rotation is parallel to the grille or suction hole has been used until the date because the fan motor can stay in the inside the housing at one end of the fan, the casing length is increased to a greater or lesser extent but avoiding having to increase the thickness of it. In this type of units the thickness of the housing is determined by the diameter of the fan impeller which, to achieve a flow optimal air, must have a minimum size. This minimum size conditions, as explained, the thickness of the housing. TO The greater the air flow, the greater the thickness of the housing.

The use of centrifugal fans, located inside the housing so that its axis of rotation is perpendicular to the larger faces of said housing, partially solves the aforementioned drawbacks. A example of this type of construction is represented in the US 5823002.

Although the impeller diameter of the fan does not condition the thickness of the housing, the size of the drive motor of said fans that conditions said thickness. This type of fans is used frequently in units intended to be installed horizontally on the ceilings of the rooms that are required condition. In this type of installation the thickness of the unit It is not of special relevance since the unit is usually left embedded between the false ceiling of the room and the formwork of the upstairs.

It is noted therefore the lack of a unit indoor air conditioner of smaller thickness than the units known, without reducing the flow of sucked air, ensuring optimum cooling power of the equipment air conditioning.

Explanation of the invention.

The indoor unit of an air equipment conditioning, object of the invention, overcomes the drawbacks previously cited. Said unit is constituted by a essentially rectangular rectangular parallelepiped hollow shell provided with two holes for air inlet and outlet, respectively, which houses at least one element of filter, at least one heat exchanger and a fan centrifugal that sucks, through the inlet hole, the air from the comfort zone of a room to the surfaces of the heat exchanger and returns it, through the orifice of exit, to the mentioned comfort zone.

In essence, unity is characterized because It comprises a dividing element that separates the housing into two transverse cavities, one of aspiration and one of impulsion, provided with an opening for the passage of air from one to another cavity, the fan being provided in said opening of the dividing element, so that its axis of rotation is arranged essentially perpendicular to the major faces of the housing, said opening constituting the entrance to the ear of fan suction, and because the heat exchanger is located on either side of the fan, always outside the axial projection of the ear of aspiration thereof.

According to another feature of the invention, the relationship between the diameter (D) of the fan impeller and the discharge height (h) of the fan blades follows the ratio: D / h ≥ 5.5.

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According to another characteristic of the invention, the unit is characterized in that it houses inside the fan drive motor, and because the stator of said motor is housed inside a casing housing located in the fan suction ear, fixed to one of the major faces of the hollow housing of the unit
inside.

According to another feature of the invention, the fan impeller comprises a circular crown flat, or flat circle of union of the blades of said impeller, the which project from the ear of aspiration towards the ends of the fan, the circular crown being attached to the motor rotor fan drive, which is an external rotor motor, and because the stator of said motor is fixed, by means of brackets, to the face of the housing adjacent to the circular crown of the fan impeller

Brief description of the drawings

The attached drawings are illustrated by way of non-limiting example an embodiment of the indoor unit of an air conditioner according to the invention. In sayings drawings:

Fig. 1 is a longitudinal section view of an indoor unit according to the invention;

Figs. 2a, 2b and 2c are paths, sectioned, dividing element and fan corresponding to three variants of an indoor unit according to the invention; Y

Fig. 3 is a schematic representation and in perspective of the indoor unit of Fig. 1.

Detailed description of the drawings

The indoor unit 1 of the air equipment conditioning shown by way of example in Fig. 1 is constituted in a manner known per se for a hollow housing 2 rectangular straight parallelepiped with two holes for air inlet 18 and outlet 19, respectively, which it houses inside two filter elements 3, which cover the mentioned air inlet and outlet holes; an exchanger 4 heat; and a centrifugal fan 5 that sucks, through the inlet hole 18, the air of the comfort zone of a stay up to the surfaces of heat exchanger 4 and what returns, through exit hole 19, to the aforementioned area of comfort.

As depicted in Figs. 1 and 3, the indoor unit 1 comprises a dividing element 6 that separates the housing in two transverse cavities, one suction 1a and one of drive 1b. The dividing element is provided with a opening 11 (see Fig. 3) for the passage of air from the cavity of suction 1a to the drive cavity 1b, always through the centrifugal fan 5 located for that purpose on the side of said opening of the dividing element, its axis of rotation being arranged perpendicular to the major faces 17 and 17 'of the housing 2, said opening 11 constituting the entrance to the ear of fan suction 7. In the example of Figs. 1 and 3 on heat exchanger 4 is located in the suction cavity 1a of the housing 2, outside the projection, axially, of the suction ear 7 of the fan.

The path of the air inside the housing 2 follows an axial direction to the fan inlet 5 and perpendicular to its axis at the fan 5 outlet, with that the inlet direction and the air outlet direction They form a right angle.

Preferably, the fan 5 is of the type that mount blades 9 facing forward, action, or backward, of reaction. Fans that mount blades oriented towards in front they incorporate a greater number of blades but generate little noise. For the same turning speed, with this type of fans get the same air flow with fans smaller compared to other fans. The fans that mount rear-facing blades, have a better performance than the previous ones since the old blades of sheet metal can be replaced by the more biting profile aerodynamic that allow to reach yields of the order of a 75 to 80% where its mass expenditure and pressure are lower for a same turning speed and number of blades as the fans of the type of blades facing forward.

In general, using this type of fans it is not necessary to reach high turning speeds to get enough flow and air force. In this example of realization the fan works at a few revolutions per minute, specifically with a 6-pole motor or more, it can work up to 950 revolutions per minute.

In order to achieve the optimum flow with the minimum space for the location of the drive motor of the fan 5, the relationship between the diameter D of the impeller 8 of the fan 5 and the discharge height h of the blades 9 of the fan follows the expression D / h ≥ 5.5. It gets like this, such as can be seen in Fig. 3, a considerable reduction of shell thickness 2 compared to current thicknesses of the known indoor units, maintaining the same technical performance in terms of cooling capacity, flow of air, available pressure, electrical consumption and noise level. In In reality, this reduction is due not only to the dimensions of the fan 5 but also to the novel location of engine 12 of drive inside the suction ear 7 of the 5. Fan With these features you reduce between 30 and a 40% of the maximum housing thickness of the indoor units of Conventional air conditioning equipment.

Indeed, as can be seen in detail in Figs. 2 and 3, the stator 10 of the drive motor 12 is housed inside a casing 13 located in the suction ear 7 of fan 5, fixed to one of the faces larger than the hollow housing 2 of the indoor unit. With this motor location the thickness of the housing 2 conforms to about measures very close to those of the drive motor 12, which guarantees in turn the air flow with the proportions between the diameter and discharge height of fan blades before detailed.

As seen in Figs. 2a and 2b the impeller 8 of the fan 5 comprises a circular crown 15, flat, of union of the blades 9 of said impeller, which are projected from the crown towards the aspiration ear 7, said circular crown 15 attached to rotor 14 of drive motor 12 of the fan 5. In the example of Fig. 2b, the motor 12 of drive is an internal rotor motor, and stator 10 of said motor is fixed, by means of corresponding supports 16 ', to the opposite side 17' of the face 17 of the adjacent housing 2 to the circular crown 15 of the fan impeller.

Alternatively, in the example shown in Fig. 2a the drive motor 12 is a motor external rotor, and the stator 10 of said motor is fixed, by means of supports 16, to the face 17 of the housing 2 adjacent to the circular crown 15 of the impeller 8 of the fan 5. Advantageously with respect to the previous variant, the supports 16 must not adapt to the thickness of the housing 2.

Another variant is shown in Fig. 2c of an indoor unit of an air conditioner according to the invention, and more specifically the dividing element 6 and the area of location of the impeller 8. In said variant it is observed that the face 17 of the housing 2 is not flat and that, unlike the variants of Figs. 2a and 2b, it presents an entrant 20 that determines a housing in which the drive motor 12 of the fan 5. Said motor 12 is firmly attached to the housing by means of supports 16 'and is provided in addition to a few seconds wall mounting brackets 21 for fixing to one of the walls of the enclosure, preferably the ceiling wall.

In the example of Fig. 2c, the recess 20 is configured as an inverted dome and is provided with a hole through which the axis of rotation of the fan 5, dragged by the rotor 14 of the drive motor 12, is inserted inside of the housing 2 to transmit the turning movement to the impeller 8 of the fan 5. Advantageously, according to this variant It is not necessary to disassemble the housing 2 to carry carry out maintenance or repair operations on engine 12 of drive

Unlike indoor units known, in which the fan 5 is provided with its own enclosure housing, which encloses the fan impeller and constitutes the ear of aspiration of the fan, in the unit interior according to the invention is the dividing element 6 which performs this function. As can be seen in Fig. 1, the opening 11 of the dividing element 6 has, as a funnel, a increasing section in the direction of air circulation. In bliss figure, the walls that constitute the ear of aspiration of the fan 5, which are part of the dividing element 6, are of concave generatrix as the upper profile of the blades 9 It is straight. Although not represented, it is understood that the profile upper of the blades 9 can be curved and that the walls that constitute the suction ear of the fan 5 can be of straight generatrix or can be provided with a curvature complementary to the upper profile of the blades 9.

In Figs. 2a and 2b, the opening 11 of the dividing element 6, alternatively, is devoid of any neck to accompany the air sucked by the fan 5 in direction to the blades 9.

On the discharge side, the dividing element 6 can present a rounded shape to facilitate the path of air at the fan outlet 5, in the direction of the exit 19, similar to the enclosures in the form of snail.

Naturally the entrance holes 18 and of air outlet 19 may be located on the side faces or on the front face of the housing 2. As regards the heat exchanger 4, this is available, maximizing the air contact surface, inclined relative to faces 17 and 17 'of the housing 2 of the indoor unit 1.

With these features, the indoor unit 1 of the air conditioning equipment object of the invention can be installed both horizontally, suspended from the roof of the room to be conditioned, as in an upright position, leaning against one of the walls of said room, occupying a minimum space due to the reduction in shell thickness 2.

Claims (2)

1. Indoor unit (1) of an air conditioning unit consisting of an essentially rectangular rectangular parallelepiped hollow housing (2) provided with two holes for the entry (18) and exit (19) of the air, respectively, which houses inside at least one filter element (3), at least one heat exchanger (4) and a centrifugal fan (5) that sucks, through the inlet hole, the air from the comfort zone of a room to the surfaces of the heat exchanger and returns it, through the exit orifice, to said comfort zone, the indoor unit comprising a dividing element (6) that separates the housing into two transverse cavities, one of suction (1a) and a discharge (1b), and is provided with an opening (11) for the passage of air from one cavity to another; the fan being provided in said opening of the dividing element, so that its axis of rotation is essentially arranged perpendicular to the larger faces of the housing, said opening constituting the entrance to the aspiration ear (7) of the fan; and the heat exchanger being located on either side of the fan, always outside the projection, axially, of the ear of aspiration thereof, characterized in that the relationship between the diameter (D) of the impeller (8) of the fan and The discharge height (h) of the fan blades (9) follows the relationship: D / h \ geq 5.5 and because the engine stator (10) (12) of the fan is housed inside a housing envelope (13) located in the suction ear (7) of the fan, fixed to one of the main faces of the housing (2) unit hollow inside. 2. Indoor unit (1) according to claim 1, characterized in that the impeller (8) of the fan comprises a flat circular crown (15), connecting the blades (9) of said impeller, which project from the ear of aspiration towards the ends of the fan, the circular crown being attached to the rotor (14) of the motor (12) of the fan drive (5), which is an external rotor motor, and because the stator (10) of said motor is fixed to the face (17) of the housing (2) adjacent to the circular crown of the fan impeller, by means of supports (16).