RU2788622C2 - Ventilation system of portable electrical household appliance for processing of food products, such as mixer or beater - Google Patents

Abstract

FIELD: household appliances.

SUBSTANCE: invention relates to unit (1) of a portable electrical household appliance for processing of food products, such as a mixer or a beater. Unit (1) contains case (2) of an elongated shape, extended along axis X1, engine (3) placed in case (2), drive head (5) actuated with engine (3) and designed to rotate at least one rotating tool, if necessary, by means of a transmission device, at least one suction hole (11) located at end (2b) of case (2) opposite to a position of drive head (5), and at least one outlet (13) located on contour (14) of case (2) in an intermediate position between a position of engine (3) and the position of drive head (5). In accordance with the invention, unit (1) contains axial fan (12) for forced circulation of fresh air coming through at least one suction hole (11) to at least one outlet (13) with passage through engine (3), wherein axial fan (12) is located between at least one suction hole (11) and engine (3).

EFFECT: disclosed structure allows for achievement of required freshness of air circulating through the engine, which prevents its necessary cooling.

18 cl, 12 dwg

Description

FIELD OF TECHNOLOGY

The present invention is applicable to portable food processing appliances such as blenders, mixers or other food processing devices.

In particular, the invention relates to an apparatus unit provided with a ventilation system which enhances the cooling of the motor which rotates the food processing means.

The invention is directed in particular to instrument clusters with an improved ventilation system for better engine cooling.

BACKGROUND OF THE INVENTION

Portable household electrical food processing appliances have been known for a long time, in particular as chopping or stirring blenders for preparing food products such as meat or soup, or mixers for making dough for cakes or pancakes, sauces, beaten egg whites, mayonnaises. etc.

The first mixers and beaters had a housing that housed a built-in motor that rotated a rotating tool, such as a knife or whisk, through a transmission device. The heat created by the engine limited its power or quickly led to a malfunction of the device.

This drawback was eliminated by installing a ventilation system on the instrument to cool the engine. Thus, portable household electrical appliances for food processing were developed, as described in patents FR 1325785, FR 1512989, EP 0925010 B1 and FR 2890252 B1.

Known from patent FR 1325785, the device is a hand blender, mainly used in shallow or, conversely, deep containers with the addition of one or two tubular transfer extensions. The device has an elongated shape. To increase the engine power, a ventilation system is installed with suction and exhaust openings located on the device, and with a radial fan. The suction ports are located on the lid opposite to the rotating mixing tool, the exhaust ports are located on the instrument with the motor and the rotating tool, while the centrifugal fan is placed on the housing facing the outlet ports. Air is circulated through the motor by a radial fan from the intake ports to the exhaust ports.

Known from patent FR 1512989, the device is a mixing blender for kneading or relatively thickening dough. The device has an elongated shape. To cool the engine, a ventilation system is installed with suction and exhaust openings located on the housing, and with an axial fan. Outlets are placed on the housing cover opposite to the position of the rotating kneading or mixing tool, and suction holes are placed on the instrument between the motor and the rotating instrument, while an axial fan is placed on the instrument between the outlets and the motor. Air is circulated through the motor by a radial fan from the intake ports to the exhaust ports.

The apparatus known from EP 0 925 010 B1 is a blender using water cleaning without damaging the motor, in particular for cleaning the part connected to the rotating mixing tool. The device has an elongated shape. To cool the engine, a ventilation system is installed with suction and exhaust openings located on the housing, and with an axial fan. The suction ports are located on the instrument at the opposite end of the mixing rotary tool, and the outlets are located at the same end of the instrument directly below the suction ports. In addition, the ventilation system includes an air circulation system located on the instrument between the inlet and outlet openings. The axial fan is located between the intake ports and the motor. Air is circulated through the engine from the intake ports to the exhaust ports by means of a radial fan and an air circulation system.

The appliance known from FR 2 890 252 B1 is a blender, in particular for use in catering establishments, i.e. equipped with a high power motor. The task is to reduce the heating of the engine through the use of a ventilation system. The device has an elongated shape and a built-in motor that rotates the rotating mixing tool through a transmission device. The ventilation system contains suction and exhaust openings. The outlets are located on the instrument at the distal portion opposite the location of the rotating mixing tool, while the motor is located on the instrument between the outlets and the rotating mixing tool. Suction ports are located on the device in the proximal part between the motor and the rotating mixing tool. In addition, the ventilation system is equipped with an axial and radial fan. The axial fan increases the flow of fresh air and circulates fresh air from the intake ports to the exhaust ports through the engine. The radial fan allows the air heated by the engine to be expelled through the outlets. The centrifugal fan is placed in the instrument facing the outlets, while the axial fan is positioned between the centrifugal fan and the motor.

The devices known from said patents FR 1325785, FR 1512989, EP 0925010 B1 and FR 2890252 B1 suffer from various drawbacks.

The solution described in patent FR 1325785 does not provide a proper air supply, since the air flow is set by a radial fan.

The solutions described in patents FR 1512989 and FR 2890252 B1 do not provide sufficient circulation of fresh air in some application situations. Indeed, when cooking hot foodstuffs such as soup, the hot steam from the food is sucked in through the suction holes; thus, it is not possible to achieve the desired freshness of the air circulating through the engine, which prevents the necessary cooling.

The solution described in EP 0925010 B1 also does not provide sufficient circulation of fresh air. Indeed, due to the location of the outlets directly below the suction holes, the flow of heated air can be sucked back into the suction holes.

DISCLOSURE OF THE INVENTION

The present invention overcomes the above disadvantages.

The invention thus relates to a portable food processing appliance unit such as a blender or mixer. The specified block contains:

- an elongated body extending along the X1 axis;

- the engine placed in the case;

- a drive head rotated by a motor and designed to rotate at least one rotating tool, if necessary by means of a transmission device,

- at least one suction port located at the end of the housing opposite to the location of the drive head,

- at least one outlet located on the contour of the housing in an intermediate position between the position of the engine and the position of the drive head.

In accordance with the invention, the unit comprises an axial fan for forced circulation of fresh air entering through at least one intake port to at least one exhaust port, passing through the engine, and the axial fan is located between at least one suction port and the engine.

Thus, in the embodiment of the apparatus unit according to the invention, fresh air is drawn in from above, i.e. away from the food to be processed, when the rotary tool rotated by the drive head is immersed in said food. In addition, the use of an axial fan and its installation upstream of the air circulation system, close to at least one suction inlet, allows you to get an optimal flow of fresh air circulating in the specified unit and passing through the motor installed downstream of the axial fan. The terms "upstream" and "downstream" are used in relation to the direction of air flow from at least one intake port to at least one outlet port.

Preferably, the housing has an upper compartment in communication with at least one intake port and a lower compartment in communication with at least one outlet port, wherein the engine is placed in the lower compartment while an axial fan is placed in the channel connecting the upper compartment to the lower department. This measure helps to create a vacuum in the upper compartment, thereby increasing the cooling efficiency.

Preferably, the housing has a fin enclosing the axial fan. This measure facilitates the execution of the upper and lower compartments.

Also preferably, the lower compartment is defined by a bottom wall through which a drive shaft passes, connecting the motor to the drive head. This measure facilitates the removal of air from the block through at least one outlet.

It is also preferable to provide a space between the engine and the bottom wall, with at least one outlet in the region of this space. Thanks to these measures, the engine is protected from penetration, which can occur in the block through at least one outlet.

Preferably, the axial fan has a peripheral edge enclosing radial blades extending from a hub rotated on axis X1 by a motor.

Preferably, the unit also contains, in addition to the axial fan, a radial fan. The radial fan is configured to remove heated air from the housing through at least one outlet.

Preferably, the radial fan is located in the area of at least one outlet. Thus, the heated air at the motor outlet has no turbulence, since the action of the radial fan removes the heated air directly through at least one outlet, without turbulence in the lower part of the housing where the drive head is located.

Preferably, the radial fan also has a radial impeller rotated on axis X1 by a motor.

In this case, the motor is designed to rotate the drive head on the X1 axis. This allows at least one suction port to be moved upwards with respect to the food being processed by the rotary tool(s) when the latter are rotated on the X1 axis or an axis parallel to the X1 axis. Alternatively, the use of a transfer device capable of rotating the rotating tool/s on a different axis, for example perpendicular to the X1 axis, can be envisaged, in which case at least one suction opening will be displaced laterally with respect to the food product.

In accordance with one embodiment, at least one suction port is located on the housing cover opposite the position of the drive head. In this way, the shifting of the at least one suction opening relative to the food product by means of the rotating tool(s) is optimized as much as possible. In addition, it is possible to avoid the risk of blocking at least one suction opening by the user's hand during manipulations with the device unit. However, it is also possible to envisage such an embodiment of the device, in which at least one suction opening is located on the contour of the housing, near the said cover, and/or near the end of the housing, opposite to the location of the drive head.

At the same time, preferably, at least one suction opening located on the housing cover is located in such a way that the supply of fresh air through at least one suction opening occurs axially, along the indicated axis X1. This contributes to the optimal intake of fresh air by the radial fan.

Preferably, the housing has at least one gripping area in the vicinity of at least one suction opening. This allows the user to grasp precisely the gripping area of the appliance body where there is no suction port(s) without blocking them.

In the first embodiment, the apparatus comprises an apparatus unit and a mixing head extending the body along the X1 axis, the mixing head being removably connected to the body, the mixing head being provided with at least one rotating tool, the drive head being able to drive the transmission device when the agitating head assembled with body. This makes it possible to process foodstuffs in deep containers. This technical solution is particularly suitable for devices such as immersion blenders.

In the above first embodiment of the apparatus, the stirring head and the housing may be formed by two independent parts connected to each other by means of an assembly device. Preferably, the assembly device has a first part located on the stirring head and a second part located on the body. The assembly device may in particular be screw or bayonet. Alternatively, the assembly device may include at least one holding element movably mounted relative to the agitating head or relative to the housing.

In the second embodiment, the device comprises a device block and an auxiliary head extending the body along the X1 axis, the auxiliary head being connected in a removable manner to the body, at least one rotating tool is placed on the auxiliary head, the auxiliary head is equipped with a transmission device that is connected to at least with one rotating tool, wherein the driving head is capable of driving the transmission device into rotation when the auxiliary head is assembled with the housing. This solution is particularly suitable for mixer-type appliances, since at least one mixing tool, for example one or two whisks, can be placed on the auxiliary head.

In the second embodiment of the device, the auxiliary head and the body can be formed by two independent parts, which are connected to each other by means of an assembly device. Preferably, the assembly device has a first part located on the auxiliary head and a second part located on the body. The assembly device may in particular be screw or bayonet. Alternatively, the assembly device may include at least one holding element movably mounted relative to the auxiliary head or body.

In a third embodiment, the instrument comprises an instrument assembly and at least one rotary tool associated with a drive head.

Alternatively, at least one rotary tool is driven in rotation on the X1 axis.

According to another embodiment, at least one rotary tool is rotated on an axis inclined relative to the X1 axis.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of the present invention are contained in the description below with reference to the accompanying drawings, in which:

- Fig.1-4 illustrate the first embodiment of the block of a portable electrical appliance for food processing with a ventilation system containing one axial fan;

- Figures 5 and 6 illustrate a second embodiment of a portable food processing appliance unit;

- FIG. 7 is a sectional view of the block of FIG. 5 and 6 with a ventilation system containing one axial fan;

- FIG. 8 is a sectional view of the block of FIG. 5 and 6 with a ventilation system comprising an axial fan and a radial fan;

- FIG. 9 illustrates a third embodiment of a portable food processing appliance unit similar to that shown in FIG. 5 and 6;

- Fig. 10 illustrates a portable electrical household food processing appliance comprising an assembly assembly with an auxiliary mixing nozzle equipped with a rotating tool such as a stirring knife;

- Fig.11 illustrates a portable electrical household appliance for processing foodstuffs containing an assembly assembly with an auxiliary mixing nozzle equipped with two rotating tools such as a mixing body;

- Fig.12 illustrates a portable electrical household appliance for food processing, containing a block assembled with a rotating tool such as a mixing body.

IMPLEMENTATION OF THE INVENTION

Hereinafter, the description of the device refers to a portable electrical appliance for food processing, containing block 1 according to the invention.

Further in the text of the description, the terms "horizontal", "vertical", "lower", "upper", "longitudinal", "transverse", "top", "bottom" are used in relation to the position of the device during use, when the rotating tool is immersed in container with a food product and location on the working surface.

Hereinafter, the same reference signs are used to indicate the same features or their equivalents, taking into account different embodiments of the device.

As shown in figures 1, 2 and 4, the device unit 1 has a body 2 extending in the longitudinal direction along the axis X1. This block 1 comprises a motor 3 housed inside a housing 2 and driving a drive shaft 4 on the axis X1, which extends downwards in the direction along the X1 axis and extends at its lower end 4a in the form of a drive head 5. The housing 2 comprises two connected to each other with the other half. In Figs. 1 and 2, one of the two halves has been removed to show the interior of the block 1. The drive head 5 is designed to receive the upper end of the transmission shaft (not shown in Figs. 1-4) which is connected to the rotary tool 8 illustrated in Figs. 10, 11 or 12.

The control of the engine 3 is implemented by means of a control element 22, which may have one or more operating speeds. Such an implementation is used in already known devices, and for its implementation in practice, a person skilled in the art can refer to known solutions.

As shown in FIGS. 1-4, the housing 2 is provided with a cover 10 mounted at end 2b. Suction holes 11 are provided in the cover 10 to circulate fresh air entering the housing 2 in the X1 direction. The intake of fresh air through the suction holes 11 is provided by an axial fan 12, which is located above the motor 3. The axial fan 12 forces the fresh air to circulate along the housing 2, from top to bottom, so that the fresh air passes through the motor 3, thereby cooling it. After passing through the engine 3, the air is heated. The air heated in this way is discharged through the outlet holes 13 located on the contour 14 of the housing 2, below the location of the engine 3 placed in the specified housing 2, preferably near the lower part 2a of the housing 2. Thus, the suction holes 11 are located at the end 2b of the housing 2 oppositely the location of the drive head 5, and the outlets 13 - between the engine 3 and the drive head 5.

As shown in FIGS. 1 and 2, the axial fan 12 has a hub 12a mounted on a drive shaft 4. The axial fan 121 is driven on axis X1 by a drive shaft 4, which in turn is driven by a motor 3. The drive shaft 4 is driven upward along the axis X1 above the motor 3, while the upper end 4b of the drive shaft 4 is connected to the hub 12a using a connecting device, for example, splined. The hub 12 is thus driven by the motor 3. The axial fan 12 has radial blades 12b extending from the hub 12a. The axial fan 12 also has a peripheral edge 12c enclosing the radial blades 12b.

The housing 2 shown in FIGS. 1 and 2 has an upper compartment 18a and a lower compartment 18b. The upper compartment 18a communicates with the intake ports 11. The lower compartment 18b communicates with the outlet ports 13. The lower compartment 18b houses a motor 3. An axial fan 12 is placed in a channel connecting the upper compartment 18a with the lower compartment 18b. More specifically, in the example shown in figures 1 and 2, the housing 2 has a rib 15, covering the axial fan 12. At the same time, in each of the halves of the housing 2 there is one section of the rib 15. The lower compartment 18b is limited by the bottom wall 19, through which a drive shaft 4 passes, connecting the motor 3 with the drive head 5. Between the motor 3 and the bottom wall 19 there is a space 19a. The outlets 13 are located in the area of the space 19a.

As shown in figure 1, the housing 2 has a gripping area 16 located under the cover 10 at a height corresponding to the height of the control element 22. This facilitates manipulation of the device unit 1 without overlapping the suction holes 11. More specifically, the gripping area 16 is located under suction holes 11.

Figures 5 and 6 show a block 1, which has a housing 2, the shape of which differs from that shown in figure 1. Here, the body 2 is also oriented vertically along the X1 axis, and its lower section 17a generally corresponds to the section of Figs. bottom part 2a. On the contrary, the upper section 17b of the body 2, on which the gripping area 16 is located, is inclined along the axis X2 relative to the axis X1. Cover 10 is located essentially perpendicular to this axis X2, it is provided with suction holes 11. Thus, the housing 2 has at least one gripping area 16 located near the suction holes 11. The suction holes 11 are located at the end 2b of the housing 2, located opposite location of the drive head 5. More precisely, the suction holes 11 are located in the cover 10. The gripping area 15 is located under the suction holes 11.

Shown in Fig.7, the placement of the motor 3, the drive shaft 4, the drive head 5 and the axial fan 12 corresponds to those shown in Figs. 1 and 2, where they are located on the lower section 17a of the housing 2, the configuration of which is similar to that shown in Figs. 5 and 6. The axial fan sucks in fresh air through the suction holes 11, then this fresh air enters the housing 2 along the path set by the somewhat inclined X2 axis, after which it returns to the path set by the X1 axis, then passes through the motor 3, where it is heated, and, finally, the heated air is removed from the housing 2 through the outlets 13 due to the circulation created by said axial fan.

As shown in FIG. 7, the casing 2 also has an upper compartment 18a and a lower compartment 18b, as well as a rib 15 enclosing the axial fan 12. The lower compartment 18b is also defined by a bottom wall 19 through which passes a drive shaft 4 connecting the motor 3 to the drive head 5. Outlets 13 are located in the region of the space 19a located between the engine 3 and the bottom wall 19.

The structure of the case 3 shown in Fig. 8 is similar to the structures of Figs. 5 and 6. However, the same structure as shown in Fig. 7 is applicable to the motor 3, the drive shaft 4, the drive head 5 and the axial fan 12, to which a radial fan 30 is added, placed in the housing 2 opposite the location of the outlets 13, which are shown in Fig.6. The radial fan 30 is designed to remove heated air from the casing 2 through the outlets 13. Like the axial fan 12, the radial fan 30 has a radial impeller 31, which is driven on the X1 axis by a drive shaft 4 driven by a motor 3. Drive shaft 4 has a lower end 4a connected to the impeller 31 by means of a spline type connector. In this embodiment, the operation of the radial fan 30 depends on the operation of the motor 3 and is synchronized with the axial fan 12. The radial fan 30 is installed in the space 19 located between the motor 3 and the bottom wall 19.

It is possible to envisage the use of such a radial fan 30 with the housing 2 of the apparatus unit 1 corresponding to that shown in FIG. 1 and 2.

As shown in FIG. 9, the body 2 of block 1 is similar to the body of FIG. 5 and 6 and can use designs similar to those shown in FIGS. 7 and 8 with respect to the implementation of the axial fan 12, the motor 3, the drive shaft 4 and the drive head 5, as well as the radial fan 30 in the case of FIG. Only the position of the suction holes 11 has been changed, which are now located on the sides 20a, 20b, at the end 2b of the housing 2, adjacent to the cover 10 and directly above the gripping area 16. In this case, the suction holes 11 are located at the end 2b of the housing 2 opposite to the location of the drive head five.

The housing 2, shown schematically in FIG. 10, is similar in design to that shown in FIGS. 1 and 2 and FIGS. 5-9. Figure 10 shows a mixing head 7 extending the housing 2 along the axis X1. In relation to the body 2, the stirring nozzle 7 is a removable device. The lower part 2a of the housing 2, shown in Fig.1, 2, 4, 5, 6, 7 or 8, is designed to fit the tip 6 located in the upper part of the mixing nozzle 7. The upper end of the transmission shaft is inserted into this tip 6 and is connected to by the drive head 5 when the tip 6 is inserted into the bottom 2a of the body 2. According to the embodiments illustrated in the figures, the connection between the bottom 2a of the body 2 and the tip 6 is realized by a bayonet-type assembly device 9. Alternatively, it is possible to provide for the use of an assembly device of a different type, for example, a screw one or containing at least one movable retaining part, when displaced, the mixing nozzle 7 and the body 2 are connected or disconnected.

As shown in this illustration, the mixing nozzle 7 has a tubular section 21, which is continued in the form of a dome 23 located at the lower end 7b of the mixing nozzle 7. The dome 23 covers a rotating tool 8. If necessary, the tubular section 21 and the dome can be made in one piece. . In the tubular section 21 of the agitating nozzle 7, a drive shaft is placed, which serves as a drive for the rotating tool 8, as noted above.

The rotary tool 8 shown in FIG. 10 contains knives for mixing foodstuffs such as soups. If necessary, the mixing nozzle 7 can be equipped with several rotating tools 8.

The device shown in Fig. 10, consisting of a block 1 and a stirring head 7, forms an immersion blender.

It is also possible to provide one or more rotary mixing body type tools 8 as shown in FIGS. 11 and 12, for example for preparing food dough. As shown in Figs. 11 and 12, whisk-type tools 24, 25 are used as rotary tools 8. Other rotating tools such as mixers, including hooks or spirals, are also applicable.

In the configuration shown in Fig. 11, the mixing head 7 is replaced by an auxiliary head 26. The auxiliary head 26 is detachable from the block 1. The auxiliary head 26 has a tip 27 similar to the tip 6 with a transmission shaft (not shown) which is connected with a drive head 5 when the specified tip 27 is installed on the lower part 2a of the body 2.

In the configuration shown in Fig. 11, the rotary tools 8 are formed by two rims 24, 25 which are connected to an auxiliary head 26. The rotary tools 8 are arranged along two axes X3 and X4. The transmission shaft drives the rotating tools 8 by means of a transmission mechanism built into the auxiliary head 26. As such a transmission mechanism, for example, a gear type mechanism can be used. As shown in Fig. 11, axes X3 and X4 are perpendicular to axis X1. The transmission mechanism makes it possible to rotate said rims 24, 25 around the respective axes X3, X4. Other configurations can be provided if necessary. The X3 and X4 axes are not necessarily perpendicular to the X1 axis. In particular, but not exclusively, the axes X1, X3 and X4 may be parallel to each other. If necessary, these axes X1, X3 and X4 can be coplanar.

Shown in Fig.11 device containing block 1 and the auxiliary head 26, forms a manual beater.

In the configuration shown in FIG. 12, the sub head 26 is integral to the body 2. The sub head 26 has a tip 27 in which a drive head (not shown) is placed.

In the configuration shown in Fig.12, the rotary tool 8 is located along the axis X1. The rotary tool 8 is formed by a single whisk 24 which is provided with a shaft 28 running along the axis X1. The shaft 28 can be mounted on the tip 27 of the auxiliary head 26, for connection with the drive head placed in the auxiliary head 26. In this way, the drive head can directly drive the rotating tool 8.

Shown in Fig.11 device containing block 1 and a rotary tool 8, forms a manual beater.

Alternatively, the accessory head 26 shown in FIG. 11 may be rigidly connected to the housing 2. Thus, in a third embodiment, the instrument comprises a block 1 and at least one rotary tool 8 connected to the drive head 5 via a coupling device.

Alternatively, the accessory head 26 shown in FIG. 12 may be detachable from the housing 2. In this case, the auxiliary head 26 is connected to the housing 2 according to the examples illustrated in FIGS. 1, 4, 5, 6, 7, 8 , 9. If necessary, the auxiliary head 26 may include a transmission device associated with a rotating tool 8, while the transmission device will be driven by a drive head 5 located in the housing 2 when the auxiliary head 26 is assembled with the housing 2.

The auxiliary head 26 embodiments disclosed above are available to those skilled in the art, who may be guided by prior art solutions.

Alternatively, the block 1 can be provided with at least one suction port 11 and/or at least one outlet port 13.

Other configurations of the device are possible within the scope of the invention, provided that the location of the suction port(s) 11 at the end 2b of the body 2, in an area separate from the grip zone 16, and the location of the axial fan 12 above the motor 3, below the suction port(s), as well as the location of the outlet/holes 13 on the housing 2, under the location of the engine 3, located in the housing 2.

Claims (24)

1. Block (1) of a portable electrical household appliance for food processing, such as a mixer or beater, while the block contains: - an elongated body (2) extending along the axis X1, - an engine (3) placed in a housing (2), - a drive head (5) driven by a motor (3) and designed to drive at least one rotating tool (8) if necessary by means of a transmission device, - at least one suction port (11) located at the end (2b) of the body (2) opposite to the location of the drive head (5), - at least one outlet (13) located on the contour (14) of the housing (2) in an intermediate position between the position of the engine (3) and the position of the drive head (5), characterized in that the block (1) contains an axial fan (12) for forced circulation of fresh air entering through at least one suction opening (11) to at least one outlet (13), passing through the engine (3), moreover, the axial fan (12) is located between at least one suction opening (11) and the motor (3). 2. Block (1) according to claim 1, characterized in that the body (2) has an upper compartment (18a) in communication with at least one suction opening (11) and a lower compartment (18b) in communication with at least one outlet (13), while the motor (3) is placed in the lower compartment (18b), and the axial fan (12) is placed in the channel connecting the upper compartment (18a) with the lower compartment (18b). 3. Block (1) according to claim 2, characterized in that the housing (2) has a rib (15) enclosing the axial fan (12). 4. Block (1) according to one of claims 2 or 3, characterized in that the lower compartment (18b) is limited by a bottom wall (19) through which a drive shaft (4) passes, connecting the motor (3) to the drive head (5 ). 5. Block (1) according to claim 4, characterized in that between the motor (3) and the bottom wall (19) there is a space (19a), with at least one outlet (13) located in the region of the space (19a). 6. Block (1) according to any one of claims 1 to 5, characterized in that the axial fan (12) has a peripheral edge (12c) enclosing radial blades (12b) extending from a hub (12a) rotated on axis X1 by means of engine (3). 7. Block (1) according to one of claims 1 to 6, characterized in that it contains a radial fan (30) configured to remove heated air from the housing (2) through at least one outlet (13). 8. Block (1) according to claim 7, characterized in that the radial fan (30) is located in the region of at least one outlet (13). 9. Block (1) according to one of claims 7 or 8, characterized in that the radial fan (30) has a radial impeller (31) rotated on the X1 axis by means of a motor (3). 10. Block (1) according to any one of claims 1 to 9, characterized in that the motor (3) is configured to bring the drive head (5) into rotation on the axis X1. 11. Block (1) according to any one of claims 1 to 10, characterized in that at least one suction opening (11) is located on the cover (10) of the housing (2) opposite to the location of the drive head (5). 12. Block (1) according to claim 11, characterized in that at least one suction opening (11) is located so that fresh air enters axially through at least one suction opening (11) along said axis X1. 13. Block (1) according to any one of claims 1 to 12, characterized in that the housing (2) has at least one grip zone (16) in the vicinity of at least one suction opening (11). 14. A portable household appliance for food processing, containing a block (1) according to any one of claims 1 to 13, characterized in that it contains a mixing nozzle (7) extending the body (2) along the X1 axis, and the mixing nozzle (7) removably connected to the body (2), the mixing head (7) contains at least one rotating tool (8), the mixing head (7) contains a transmission device connected to at least one rotating tool, while the drive head (5) is capable of drive the transfer device into rotation when the mixing head (7) is assembled with the body (2). 15. A portable electrical household appliance for food processing, containing a block (1) according to any one of claims 1 to 13, characterized in that it contains an auxiliary head (26) extending the housing (2) along the X1 axis, and the auxiliary head (26) is detachably connected to the body (2), at least one rotating tool (8) is placed on the auxiliary head (26), the auxiliary head (26) contains a transmission device connected to at least one rotating tool, while the drive head (5) capable of driving the transmission device into rotation when the auxiliary head (26) is assembled with the body (2). 16. A portable electrical household food processing appliance, comprising a unit (1) according to any one of claims 1 to 13, characterized in that the appliance comprises at least one rotating tool (8) associated with a drive head (5). 17. Appliance according to one of claims 14, 15 or 16, characterized in that at least one rotary tool (8) is driven on axis X1. 18. A device according to one of claims 14, 15 or 16, characterized in that at least one rotary tool (8) is driven on an axis inclined relative to the X1 axis.

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