CZ32325U1 - A fan for fume hoods - Google Patents

Abstract

A heating system with a heat pump connected to a heating system in a heated building and with at least one conduit opening below the surface of the pumped water consists of at least one transport conduit (23) in the source well (1) or well which is connected to the well by the interconnecting transport conduit (26) Or (2) a well where it is connected to at least one head (27) of a suction pump chamber (28) of a pumping gravity device, the suction pump chamber being rigid and / or changing its shape and volume by the weight of the pumped water. At the bottom (29) of the pumping chamber, there is at least one outlet opening (30) for draining cooled water from the chamber (28) to the infiltration portion (33) of the well (2) or well, being located in the well (2, 1) or well at least one heat pump evaporator exchanger (32). The heating system further comprises at least one compressor (17) and a heating system (40) comprising at least one condenser, throttle (45), collector (42), heat exchange device (43), dehydrator (41) and solenoid valve (44). ). The method of gravitational vacuum pumping of fluids is that liquid is fed into at least one flexible suction pump chamber (28) via the suction head (61), at least one of the transport conduits connected to the infiltration well or well, under the weight of the pumped liquid and the pump chamber this pumping chamber changes its volume and, after the liquid has been discharged by at least one outlet opening located on the pumping chamber or on the connected discharge conduit, a vacuum is created in the upper part of the suction pump chamber (28), thereby sucking up the liquid.

Description

In the registration procedure, the Industrial Property Office does not determine whether the subject of the utility model meets the conditions for eligibility for protection pursuant to Section 1 of Act no. No. 478/1992 Coll.

CZ 32325 UI

Hood fan

Field of technology

The subject of the presented technical solution is a fan for hoods for domestic use according to the introductory part of the main claim for protection.

Prior art

It is known to use a fan (or motor fan) in domestic fume hoods, which in particular comprises a spiral hollow body or diffuser or screw in which a centrifugal impeller driven by an electric motor runs. The helical hollow body or diffuser typically has a body defined by two half-shells, at least one of these half-shells having a number of openings for the extraction of fumes from the cooking field. These openings thus exist on at least one side of the helical hollow body or diffuser.

This spiral hollow body or diffuser further comprises an opening or pipe, mounted on the side with respect to the centrifugal wheel of the blower or centrifugal impeller, into which this wheel discharges the extracted vapors for their return to the surroundings (after filtration) or for their supply to the exhaust pipe. , which is located outside this area (where the cooking field is located).

It is known that in order to minimize the space requirement of the motor fan inside the hood, the motor is located in the inner space of the blower wheel. A drive shaft emerges from the motor, which is mounted on a transverse part of the blower wheel mounted inside this interior space.

Hoods for domestic use are characterized in terms of energy consumption. The search for a solution by which the hoods achieve higher energy classes (A and A +, but also A +++ and A ++), which is for the high efficiency of the operation of the home appliance (hood), is increasingly being stepped up.

For the above reason, the electric motors used in the prior art fans of low or very low efficiency asynchronous motors have been replaced by high efficiency asynchronous motors and thus so-called brushless permanent magnet motors. With them, the highest performance in terms of efficiency and the highest energy classes (A-H- and A +++) can be achieved.

However, brushless motors need a special electronic circuit (inverter) to control them. Said circuit belongs to the pad of the printed circuit, the location of which, however, must not increase the final space requirement of the fan and thus the hood. For this reason, those solutions have been considered to be effective which suggest arranging this printed circuit board in a fume hood at a position remote from the motor fan, in a housing connected to one of the outer walls of the motor fan and designed exclusively for this purpose, so that the air flow the fan manufactured, is not affected, or is integrated in the motor, mounted on the outer wall of the motor fan.

These solutions, while functional, have problems with the separate mounting of the circuit board in the hood or the creation of space in the motor fan or the integration of the circuit board in the motor.

The essence of the technical solution

The aim of the presented technical solution is to offer a fan or motor fan for hoods for domestic use, which is improved compared to known solutions.

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In particular, the aim of this technical solution is to provide a fan of the above-mentioned type, which can be easily manufactured and in which the control circuit of the printed circuit in the motor is arranged in a position which does not obstruct the exhaust air flow, while maximizing the fluid dynamic efficiency of the blower wheel. the most important parameter for the energy classification of the hood in which the fan is built.

Another object is to produce a fan where the above-mentioned printed circuit board is arranged in a position in which there is good air movement, whereby a high power density (density equal to the ratio between the electrical delivered power and the volume of the printed circuit board) can be achieved without it is necessary to use coolers that would cause additional costs in the manufacture of the fan.

Another object of this technical solution is to provide a motorized fan or a fan in which electromagnetic disturbances are minimized, which typically increase with the length of the electrical cables that connect the printed circuit board to the motor.

Another goal is to offer a fan where the motor is mounted on a diffuser, so that a mechanically more stable and compact module is produced.

These and other objects, which will be apparent to a person skilled in the art, are achieved by a fan according to claim 1. An improved motor for such a fan is also required.

Explanation of drawings

For a better understanding of this technical solution, the following non-limiting drawings are attached, purely for orientation, in which:

Fig. 1 is an exploded perspective view of a fan according to this technical solution; Fig. 2 is a perspective view of the fan motor of Fig. 1 in an assembled state, and Fig. 3 is a cross-sectional view of the fan taken along line 3-3 of Fig. 2.

Examples of technical solution

Referring to the above drawings, the fan according to this technical solution is generally designated 1 and comprises a spiral hollow body or diffuser 2 and a centrifugal impeller 3 or a centrifugal blower wheel which moves by means of an electric motor 4 to an output shaft (drive shaft) 6 with which this is the impeller is firmly connected via the inner part 7. The fan 1 is suitable for insertion into a fume hood for domestic use, which are typically mounted above the cooking field on which the vapors and vapors to be extracted are generated.

The diffuser 2 comprises two half-shells 10 and 1f which are joined together along their circumference and define a pressure pipe 13 fixed on the side with respect to the centrifugal impeller 3. Each half-shell 10, 11 comprises a body 15 which is substantially cup-shaped and which is provided on the side by a half 16 of a pipe 13. In particular, each body 15 has a flat part Γ7 from which the outer wall 18 rises (which is connected to the corresponding wall of the other body) and in which there are conventional grate-shaped openings 20 to allow suction. air (with vapors and fumes) from the cooking field.

Inside the diffuser 2, an impeller 3 or a blower wheel is mounted in a manner known per se, which has a conventional rib blowing a cylindrical hollow body 22. An electric motor 4 is inserted in the impeller, from the first side 36 a shaft 6 protrudes. inside the impeller 3 with a hemispherical part 7 so as to allow its rotational movement to be guided by the motor side 4.

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The electric motor 4 is a brushless motor of known type with permanent magnets, comprising a conventional stator 30 and a rotor 31 fixedly connected to a shaft 6. The motor has a closed structure having an end cap 32 and an end cap 33 which enclose said stator. a rotor.

This motor 4 needs a special control circuit to control it (inverter). This circuit comprises a printed circuit board 40 which carries electrical / electronic components 41 for operating the motor. This circuit board 40 is arranged on the first side 36 or the end of the motor 4 which is furthest inside the impeller 3, or at the end where the upper cover 33 is fixed, i.e. the end furthest from the second side 37 or the end in near the flat part 17 of the half-shell 10, to which the motor 4 is mounted via the lower lid 32. Screws 45 are provided which connect the lid 32 to the middle part 46 of the flat part 17 of the half-shell 10.

The concave lid 47 or hemispherical lid, which is attached to the upper cover 33 in each known manner, covers the printed circuit board 40 and forms with this cover 33 a space 48 in which the above-mentioned printed circuit board and the components 41 thereto exist. belongs.

The circuit board 40 has an opening 50 in which the drive shaft 6 extends.

Thanks to this technical solution, it is possible to produce a fan in which the printed circuit board 40 is arranged as far as possible from the part 46 of the half shell 10 of the diffuser 2 on which the motor 4 is mounted. function to allow air to pass to the impeller 3. This position of the circuit board 40 described above prevents interference with this passage and allows the maximum possible amount of air to pass through the grille 20 of the flat part 17 of the diffuser 2. This gives the maximum possible fluid-dynamic efficiency for the blower wheel.

In addition, the circuit board 40 and its components are designed in the area of the blower wheel, where there is such air movement that optimal cooling of the electrical / electronic components 41 is possible without the need for heatsinks, which would entail additional costs. motor and thus at the fan.

In addition, since the printed circuit board 40 is directly connected to the motor 4, we avoid cable connections, which are a source of electromagnetic disturbances.

Finally, according to this technical solution, by directly mounting the motor on the half shell 10 of the diffuser 2 and placing the printed circuit board 40 (light element) as far as possible to the above mounting points, it is possible to bring the blower wheel center of gravity closer to these points and give stability to the mounting module.

Claims (4)

CLAIMS FOR PROTECTION A fan (1) for hoods for domestic use, said fan comprising a diffuser (2) in which a centrifugal impeller (3) is movably inserted, inside this impeller (3) an electric motor (4) is mounted, which is mounted on the first side of the diffuser (2), where an inlet for air drawn from the cooking field is arranged, said motor (4) being a brushless or brushless motor with permanent magnets, which is controlled by an electronic circuit (41) associated with its own carrier or pad (40). ) of the printed circuit, said motor (4) generating a rotary movement of the drive shaft (6), which is connected to the centrifugal impeller (3) and protrudes from the first side (36) of the motor (4), the second side (37) of the motor ( 4), which lies opposite the first side (36), is attached to the diffuser (2), characterized in that the pad (40) of the printed - 7 EN 32325 U1 of the motor control circuit (4) is connected to the first side (36) of the motor (4) and lies inside the impeller (3). Fan according to Claim 1, characterized in that the printed circuit board (40), which carries 5 electrical / electronic components (41) for controlling the operation of the motor (4), has an opening (50) through which the drive shaft (6) passes. ) for guiding the rotational movement of the impeller (3). 3. The fan according to claim 1, characterized in that said washer (40) of the printed circuit is covered with a concave cap (47) which is flush with the first side (36) of the motor (4) and with said first side ₍₁₀ (36) connected. Fan according to claim 1, characterized in that the diffuser (2) comprises two half-shells (10, 11), the motor (4) comprising on its other side (37) an end cap (32) which is fixed to the middle part (46) of the half-shell (10) of the diffuser (2), this motor having on its first side (36) a cover (33) which closes it and to which a printed circuit board (40) is connected.