IL126229A

IL126229A - Air conditioner

Info

Publication number: IL126229A
Application number: IL12622998A
Authority: IL
Original assignee: Bsh Bosch Siemens Hausgeraete
Priority date: 1997-09-18
Filing date: 1998-09-16
Publication date: 2002-12-01
Also published as: ITMI982014A1; IL126229A0; DE19741161A1; IT1302217B1

Abstract

Air conditioner (10) with at least two air ducts (16, 21) arranged inside its housing (11), each of which having an air intake (17, 22) and an air discharge opening (20, 26), along which the air is forced through at least one ventilator rotor (19), whereby one of the air ducts is equipped with an evaporator (18) belonging to the refrigerating unit, and the other air duct is equipped with a condenser (23) of the refrigerating unit, wherein the air duct equipped with evaporator is provided with means by which the noise of the cold air stream (II) flowing from the outlet side is reduced and the cold air stream (II) is discharged while being diffused, and said means are disposed between said evaporator and said air discharge opening. 3551 כ" ו בכסלו התשס" ג - December 1, 2002

Description

Air-conditioner BSH Bosch und Siemens Hausgerate GmbH C.113386 AIR CONDITIONER The invention relates to an air conditioner with two air ducts arranged inside its housing, each having at least one air intake and one air outlet, through which the air is forced by at least one ventilator rotor, whereby one of the air ducts is equipped with an evaporator belonging to a refrigerating unit and the other air duct with a condenser of the refrigerating unit.

An air conditioner is known from EP-0 448 935 A2 whose housing is equipped with two air ducts, each having one air intake and one air outlet, with one of said air ducts being equipped with an evaporator belonging to a refrigerating unit and the other with a condenser of the refrigerating unit. A radial ventilator rotor producing forced airflow is provided inside each of the air ducts, said rotors always being seated on an axle journal of a common electrical drive, and the evaporator or the condenser connected in front of the suction side. The ventilator rotors are used for forcing airflow over the condenser or the evaporator, whereby the air, which is cooled during the intake over the evaporator, is expelled with considerable noise and a relatively narrow airflow beam at the outlet side as the result of the airflow characteristics of the radial ventilator blades. A cold, directional airflow of relatively high velocity is thereby produced in the room to be cooled, creating a very unpleasant cold draft for a person staying in said room, and moreover, also causing dust whirling in this room.

- - The objective of the invention is to improve an air conditioner by simple constructive measures according to the preamble of Claim 1.

According to the invention, this objective is solved by means in the air duct equipped with the evaporator for facilitating the flow of cold air from the air outlet(wlth~as little noise s possible and at least approximately diffused.

The design of the air conditioner according to the invention creates a cold airflow which, due to a relatively large solid or dihedral angle, flows quite evenly distributed from the outlet of the air duct equipped with the evaporator. Such an airflow therefore results, on the one hand, in an almost negligible noise level; on the other hand, due to its uniform outflow at relatively low velocity from the equipment, it does not create any unpleasant cold draft for persons staying in the room to be cooled. However, at the same time it is possible to achieve - by the radial ventilator rotor mounted in the air duct equipped with the condenser, together with the so called worm casing - a high air movement volume with extremely stable pressure, which is required for transporting the exhausted air even through relatively long hoses, with no need to provide a special electrical drive for the ventilator rotors.

Specifically affected is the airflow exiting from the outlet of the air duct equipped with the evaporator when, according to a preferred embodiment of the invention, the means are mounted downstream of the evaporator in the direction of the forced airflow, according to the principles of fluidics.

According to an additional embodiment of the invention, the means are made in the form of a cross-flow ventilator rotor.

Due to the relatively large area of the outlet cross-section, a greatly diffused airflow is produced at the outlet of the air path with a relatively high air movement volume by using a cross-flow rotor; furthermore, this..type of ventilator rotors create little noise emission. Due to the relatively high air movement volume and favorable rectangular air velocity distribution, the room is cooled rapidly, whereby the supplied cold air does not cause any unpleasant draft phenomena.

The relatively small build-up of static pressure during cross-flow cooling does not affect the airflow over the evaporator, because in this case only small pressure differences must be overcome. High resistance, resulting from the downstream connected discharge hose, which would have to be overcome at the condenser side, does not occur in this case.

According to an alternative embodiment of the invention, the means are made in the form of an axial ventilator rotor.

A ventilator equipped with such a ventilator rotor requires only a small mounting space and permits the supply of a sufficiently large air volume at a relatively low static pressure, with the result that, in this case as well, a draft, which is created when operating the blower, can be prevented at least to a great extent. However, due to the movement of a relatively large air volume, a room, for example, can be cooled very rapidly.

The cold airflow coming from the air duct equipped with the evaporator is especially simple and specifically adjustable by one service person if, according to another alternative embodiment of the invention, the means are - - made in the form of an adjustable aperture with directional airflow devices.

An air conditioner can be built in an especially space saving and cost effective way if, according to a final embodiment of the invention, the forced air movement in the ducts is produced by a motor with two axle journals arranged opposite each other and extending into the air duct, with each of them equipped with a ventilator rotor.

The invention is explained below by means of the drawings showing a simplified representation of an embodiment: Fig. 1 schematically shows a section of an air conditioner in the area of the air ducts with a motor arranged between its ventilator rotors Fig. 2 shows a section of an air conditioner very similar to the air conditioner shown in Fig. 1, with a motor integrated with one of its ventilator rotors.

Fig. 1 schematically shows a cross-section through transportable air conditioner 10, provided inside housing 11 with good heat insulating dividing wall 12, which holds in an opening the casing of drive-motor 13 with two opposite located axle journals 14 and 15, and which separates two canal-like air ducts, both as fluidic and as heat insulating as possible. One of these two air ducts, first air duct 16, is equipped near inlet opening 17 with heat-exchanger 18, which, for example, is made in the form of a lamellar evaporator belonging to a refrigerating unit not further explained here, said heat-exchanger being arranged essentially over the entire width of air duct 16. Evaporator 18 is fitted at the intake-side inside air duct 16 in front of cross-flow ventilator rotor 19 which is seated on axle journal 14 and is - 5 - 126229/2 driven by motor 13 in the direction of arrow I. Forced air movement, symbolically represented by double arrow II, of the air present at the installation site of air conditioner 10, which enters at intake opening 17 and is cooled by evaporator 18, is thereby created along this air duct. This air is moved by cross-flow ventilator rotor 19 along air duct 16 to outlet opening 20, from where it flows in a greatly diffused manner at relatively low static pressure into the ambient atmosphere of air conditioner 10.

Directly adjoining air duct 16, air conditioner 10 has additional air duct 21 which, as already previously explained, is separated in as fluidic and as heat-insulating a manner as possible, and which, near inlet opening 22, is provided with a heat exchanger made in the form of condenser 23 which is part of the refrigerating unit of air conditioner 10. Inside air duct 21, radial ventilator rotor 24, which is seated on axle journal 15 of drive-motor 13, is hooked-up with condenser 23, said rotor being surrounded by worm casing 25 which is fluidically adjusted to radial ventilator rotor 24. In addition to the suction opening (not described in detail) pointing in the direction of the free end of axle journal 15 around which worm casing 25 is centrically arranged, said casing is also provided with outlet opening 26 which is also the outlet opening of air duct 21. Air movement is produced along air duct 21 by driving axle journal 15 in arrow direction I (symbolically presented as double arrow III), whereby the spatial air in the vicinity of air conditioner 10 is moved over condenser 23 to the suction side of radial ventilator rotor 24, arranged centrically around axle journal 15, and through radial ventilator rotor 24 over worm casing 25 up to outlet opening 26. From there, the mentioned exhaust air is moved to exhaust duct 27 indicated by dotted line, which is arranged at the pressure side of the radial ventilator rotor and connected with outlet opening 26, from where, for example, it is disposed at the installation site of air conditioner 10 into the free atmosphere.

Fig. 2 schematically presents air conditioner 30, which is extensively modeled after air conditioner 10 shown in Fig. 1, so that the same reference numbers are used for identical equipment characteristics of both air conditioners. By contrast to air conditioner 10, the air conditioner shown in Fig. 2 is equipped with drive 31, located as an external rotor motor in the intake area of the radial ventilator rotor. This enables design of the air conditioner housing in a narrow and compact shape.

Contrary to the presented and described embodiment, it is also possible to apply at the outlet, instead of the cross-flow ventilator rotor, an axial ventilator rotor which produces a greatly diffused airflow at relatively low pressure.

Claims

126229/2 CLAIMS:

1. Air conditioner with at least two air ducts arranged inside its housing, each of which having an air intake and an air discharge opening, along which the air is forced through at least one ventilator rotor, whereby one of the air ducts is equipped with an evaporator belonging to the refrigerating unit, and the other air duct is equipped with a condenser of the refrigerating unit, wherein air duct equipped with evaporator is provided with means by which the noise of cold air stream (II) flowing from the outlet side is reduced and the cold air stream (II) is discharged while being diffused, and said means are disposed between said evaporator and said air discharge opening.

2. Air conditioner according to Claim 1, wherein the means are fluidically connected, downstream from evaporator in the direction of forced air stream (II).

3. Air conditioner according to Claim 1, wherein the means are made in the form of a cross-airflow rotor of the ventilator.

4. Air conditioner according to Claim 1, wherein the means are made in the form of an axial rotor of the ventilator.

5. Air conditioner according to Claim 1, wherein the means are made in the form of an adjustable aperture device.

6. Air conditioner according to Claim 1, wherein the forced air movement in air ducts is produced by drive-motor with two axle journals located opposite each other and protruding into air ducts each of said journals being equipped with one of ventilator rotors. For the Applicants, REINHO By: