EP2488309B1 - High-pressure cleaning device - Google Patents

Description

The invention relates to a high-pressure cleaning device, comprising a heatable heat exchanger for heating a deliverable from the high-pressure cleaning fluid, a motor with a drive shaft defining a drive shaft, a pump unit to increase the fluid pressure, an impeller for generating a combustion air flow and a fuel pump to promote a fuel for the heat exchanger wherein the pump unit, the impeller and the fuel pump are arranged along the drive axis and driven by the drive shaft and form together with the motor a unit.

Such a high-pressure cleaner is in the DE 36 17 556 A1 described. It has a complicated construction, in which the unit mounted vibrating and wobbling with vertical drive axle standing on a wall of a complex designed housing for the impeller and the fuel pump is held on a chassis of the high-pressure cleaner. The arranged above the wall part of the assembly of motor and pump unit is freely accessible in the interior formed under a hood of the high-pressure cleaner.

The EP 0 890 394 A2 which is considered to be the closest prior art for the purposes of claim 1, describes a high pressure cleaning apparatus comprising a heatable heat exchanger and a motor pump unit, the motor pump unit comprising an electric motor, a high pressure pump, and optionally a ventilating fan for providing a cooling air flow to the motor pump unit. The motor pump unit is received in a semicircular in cross section, cup-shaped depression of the upper part of a chassis of the high-pressure cleaner. A cross-sectionally also semicircular hood covers the motor pump unit and encloses it together with the recess on all sides.

In the DE 93 03 648 U1 a high-pressure cleaning device is described which has a horizontally mounted heat exchanger with a horizontally oriented axis. Above the heat exchanger, a motor pump unit is arranged with an electric motor and a high-pressure pump drivable by this, wherein the electric motor also drives a fan for providing a combustion air flow and a fuel pump for conveying a fuel.

Object of the present invention is to develop a high-pressure cleaning device of the type mentioned so that while achieving a more compact design for the high-pressure cleaner a simplified assembly of the unit on the high-pressure cleaner is possible.

This object is achieved by a high-pressure cleaner with the features of claim 1.

By using the half-shell housing for mounting the assembly on the high-pressure cleaner otherwise required fasteners for mounting individual components of the assembly can be at least partially saved. This saving leads on the one hand to a reduced space requirement and thereby favors a more compact design of the high-pressure cleaning device. On the other hand, less effort is required to mount the unit on the high-pressure cleaner. In addition to saving on fasteners, the simplified assembly achieved thereby serves to reduce the manufacturing cost of the high pressure cleaner. In addition, the maintenance of the high-pressure cleaner is simplified.

In the receiving space, the assembly is at least partially included. This is for example possible because it is used approximately in the first half-shell and is then at least partially covered by the second half-shell. For example, protrusions may be arranged on the assembly, which cooperate with corresponding recesses on the half-shell housing for fixing the assembly relative to the half-shell housing. The projections may be pins formed on the motor, which correspond with blind-hole-like recesses on the half-shell housing. In addition or as an alternative to this positive fixing, the structural unit can be frictionally held on the half-shell housing.

In addition to the advantages already mentioned, the structural unit is at least partially accommodated in the high-pressure cleaning device according to the invention in the receiving space and thus at least partially covered by the first and / or second half-shell. As a result, the possibility is given to protect the recorded in the receiving part of the unit from external influences and to escape the immediate access of a user.

The pump unit is at least partially disposed outside of the half-shell housing. In this way, access to the pump unit is facilitated. This is advantageous, for example, during maintenance of the high-pressure cleaning device, for example when maintenance work is to be carried out on a supply line for pressurized liquid and / or on a discharge line for pressurized liquid which is held on the pumping unit.

It is advantageous if the high-pressure cleaning device is arranged along the drive axis and driven by the drive shaft fan wheel for generating a cooling the motor cooling air flow as part of Assembly includes. In this way, the engine can be effectively cooled and protected from possible overheating. The fan is part of the assembly and driven by the drive shaft, so that a separate drive for the fan can be avoided. This allows a still compact design of the high-pressure cleaner.

Effective cooling of the engine can be achieved; if the fan is designed as held on the drive shaft axial fan and the engine, relative to the drive axis, axially upstream. In this case, it is preferably directly upstream of the engine.

It is advantageous if the fan and the motor are at least partially arranged in the receiving space. In this way, the fan and the motor are protected by the half-shell housing at least partially against external influences and immediate access by a user. At the same time, a cooling of the motor can be ensured even with a compact design of the half-shell housing by the fan in the drive chamber generates a cooling air flow.

It is advantageous if the half-shell housing in the region of the fan and the motor designed a flow channel and if in the half-shell housing the fan, relative to the drive axis, axially upstream at least one inlet for air sucked by the fan and axially downstream at least one outlet opening for the cooling air flow is formed , In this way, a particularly effective cooling of the engine can be achieved, in which the fan wheel sucks in cooling air through the at least one inlet opening and blows through the flow channel past the engine. Through the at least one outlet opening, the cooling air can escape from the half-shell housing. The first and / or the second Half shell serve in this embodiment as air guide elements of the flow channel, in which case they may be shaped in particular so that the half shell housing an outer contour of the engine is modeled. In this way, it can be effectively flows around the cooling air flow and cooled.

It can be provided that at least partially atmospheric cooling air is sucked through the at least one inlet opening and that the at least one outlet opening passing cooling air can be at least partially discharged into the atmosphere.

The pump unit can in particular with its arranged outside of the half-shell housing part in a half-space be arranged, which is bounded by one of the half-shells, which projects in the region of the pump unit, based on the drive axis, axially beyond the other half-shell.

It is also to simplify maintenance of the pump unit, it is advantageous if the pump unit in the axial direction, based on the drive axle, forms a first end of the assembly.

Preferably, the pump unit is arranged in the axial direction, based on the drive axis, on the side facing away from the above-mentioned fan side of the motor. This allows not only to cool the engine by means of the cooling air flow, but also the pump unit.

Advantageously, the motor and the pump unit form a unit which engages axially through an opening formed in the half-shell housing between the first half shell and the second half shell, relative to the drive axle. The pump may for example be flanged to the engine and is arranged in this embodiment, at least partially outside the receiving space.

Preferably, the impeller is arranged in the receiving space. As a result, the half-shell housing sections together with the impeller form a fan for combustion air. A separate housing for the impeller can be avoided in this way. This allows over the achievement of a compact design addition, a saving of components and thus allows a more cost-effective production of the high-pressure cleaning device. In addition, an air duct for the combustion air can be achieved with the half-shell housing.

By means of the blower of blower wheel and half-shell housing formed in this way, an effective combustion air flow can be provided if in the half shell housing the impeller, relative to the drive axis, axially upstream at least one inlet for air sucked by the impeller and / or if in the half shell housing at least one outlet opening for the combustion air flow is formed.

It can be provided that at least partially atmospheric air can be sucked from the impeller through the inlet opening, so that the heat exchanger is not supplied exclusively by the exhaust air of the engine heated air.

Advantageously, the half-shell housing forms a connecting element for a combustion air duct, which opens into the receiving space via the outlet opening. The connecting element is designed, for example, in the form of a connecting piece, which can be detachably connected to the combustion air channel, in particular without tools. This facilitates the installation and maintenance of the high-pressure cleaner.

Preferably, the impeller is formed as held on the drive shaft radial fan and arranged in the axial direction, relative to the drive axis, on the side facing away from the motor of the motor associated impeller. In this way, the blower wheel can effectively provide a combustion air flow. Because the impeller is axially upstream of the impeller and the engine, in this embodiment it can be ensured that the combustion air does not comprise exclusively air heated by waste heat from the engine. This has proven in practice to be cheaper for the operation of the heat exchanger.

It is advantageous if between the impeller and the impeller in the axial direction, based on the drive axis, a limited space in the circumferential direction of the drive shaft intermediate shell is formed by the half-shell housing in the air sucked by the fan through several formed in the half-shell housing in the circumferential direction of the drive axis through openings can. In this way, it can be ensured on the one hand that sufficient air can be sucked in to form the cooling air flow through the fan wheel. On the other hand, by means of the impeller axially upstream fan impeller effectively a combustion air flow can be provided. In this embodiment, the half-shell housing, for example, form a first housing portion, which forms a fan together with the impeller. Furthermore, the half-shell housing can form a second housing section, which forms a flow channel at least partially surrounding the fan wheel and the motor. The two housing sections are connected to one another in the region of the intermediate space between the fan wheel and the fan wheel, and air drawn in by the fan wheel can enter the receiving chamber via the inlet openings. The half-shell housing forms in this way, so to speak, two axially juxtaposed housing sections for the blower and for the motor and the fan - in the form of the flow channel - from. Each housing section is formed in each case half of one of the half-shells.

Advantageously, an intermediate wall oriented transversely to the drive axis divides the receiving space, with respect to the drive axis, axially into a first spatial region in which the combustion air flow can be generated, and into a second spatial region in which a cooling air flow cooling the engine can be generated. The intermediate wall separates the receiving space in functional terms. In the first room area, the combustion air flow is generated by means of the fan wheel. In the second space area is, for example by means of of the fan wheel that generates cooling airflow. In this way, both the engine can be effectively cooled and the heat exchanger combustion air can be provided. The intermediate wall is preferably arranged on or in the aforementioned intermediate space.

In a structurally simple embodiment of the high-pressure cleaning device, it is advantageous if the intermediate wall is formed by the impeller. This is, for example, a radial fan with a transverse to the drive axis oriented disc, on the outer circumference parallel to the drive axis aligned fan blades are held. As a result, it is possible to dispense with a separate intermediate wall or an intermediate wall formed by the first and / or the second half shells.

Advantageously, the fuel pump is arranged outside of the half-shell housing, because this facilitates the maintenance of the high-pressure cleaning device. Outside of the half-shell housing, the fuel pump during maintenance in a simplified manner achievable, so that fuel lines from the fuel pump user-friendly separated and / or can be connected to this.

It can be provided that the fuel pump is arranged in a half-space, which is bounded by one of the half-shells, which projects in the region of the fuel pump, relative to the drive axis, axially beyond the other half-shell.

Also, to achieve the fuel pump in a simpler manner and thus facilitate the maintenance of the high-pressure cleaner, it is advantageous if the fuel pump in the axial direction, based on the drive axle, forms a second end of the assembly.

It has proven to be advantageous if the fuel pump, the impeller, relative to the drive axis, axially upstream of the drive shaft is held. However, the fuel pump can also be held on the impeller and thereby rotatably coupled to the drive shaft.

The half-shell housing preferably has a holding element oriented transversely to the drive axis, on which the fuel pump is held in the axial and / or radial direction with respect to the drive axle. The holding element serves to fix the fuel pump and thus also the assembly relative to the half-shell housing, for example by positive locking.

So far, the design of the half-shell housing and the first and the second half-shell has not yet been discussed in detail. Preferably, the half-shell housing is barrel-shaped with an at least partially channel-shaped first half-shell and / or second half-shell configured. It has been found that in a barrel-shaped configuration of the half-shell housing a particularly compact design can be achieved. In the barrel-shaped half-shell housing, for example, the impeller, the fan and the motor can be arranged at least partially to save space, so to speak, the "axis" of the half-shell housing is aligned coaxially with the drive axis. The half-shell housing may be arranged on the high-pressure cleaner so that its "axis" is aligned horizontally, vertically or otherwise.

Advantageously, the first half shell and / or the second half shell is made in one piece and / or made of a plastic material. Thereby, the high-pressure cleaner becomes simple in construction, and the manufacturing cost can be reduced. It is particularly advantageous when the first half shell and the second half shell are made in one piece and when the first half shell and the second half shell are made of a plastic material.

The high-pressure cleaning device preferably comprises a chassis that configures the first half shell and / or the second half shell. As a result, the construction of the high-pressure cleaning device can be further simplified and its design can be made even more compact. Furthermore, this reduces the number of components required for the high-pressure cleaner and thus its manufacturing cost. The chassis can in particular be made in one piece and advantageously made of a plastic material. In a particularly preferred embodiment, it has proved to be advantageous if the chassis designed the first half-shell into which the assembly can be used for assembly. Subsequently, the assembly of the second half-shell can be at least partially covered, which can be fixed to the first half-shell.

In order to achieve an even more compact design of the high-pressure cleaning device, it is advantageous if the drive axle is aligned horizontally.

For the same reason, it has proved to be advantageous if the assembly, in particular with horizontally oriented drive axle, is arranged below the heat exchanger.

Figur 1:

eine perspektivische Ansicht eines erfindungsgemäßen Hochdruckreinigungsgerätes;

Figur 2:

eine perspektivische Ansicht einer Baueinheit des Hochdruckreinigungsgerätes aus Figur 1 mit einem Motor, einem Pumpaggregat, einem Lüfterrad, einem Gebläserad und einer Brennstoffpumpe in Explosionsdarstellung;

Figur 3:

eine perspektivische Ansicht eines Unterteils des Hochdruckreinigungsgerätes aus Figur 1, teilweise in Explosionsdarstellung, umfassend ein eine untere Halbschale zur Aufnahme der Baueinheit ausbildendes Chassis, die Baueinheit sowie eine obere, die Baueinheit abdeckende Halbschale;

Figur 4:

das Unterteil des Hochdruckreinigungsgerätes aus Figur 3 im zusammengebauten Zustand;

Figur 5:

das Unterteil des Hochdruckreinigungsgerätes aus Figur 3 ohne die Baueinheit und ohne die obere Halbschale;

Figur 6:

eine Draufsicht auf das Unterteil aus Figur 3 im zusammengebauten Zustand und

Figur 7:

das Unterteil aus Figur 6 nach dem Entfernen der oberen Halbschale.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings, the detailed explanation of the invention. Show it:

FIG. 1:

a perspective view of a high-pressure cleaning device according to the invention;

FIG. 2:

a perspective view of a structural unit of the high-pressure cleaning device FIG. 1 with an engine, a pump unit, a fan, an impeller and a fuel pump in exploded view;

FIG. 3:

a perspective view of a lower part of the high-pressure cleaner from FIG. 1 partially exploded, comprising a lower half-shell for receiving the assembly forming chassis, the assembly and an upper, the unit covering half shell;

FIG. 4:

the lower part of the high-pressure cleaning device FIG. 3 in the assembled state;

FIG. 5:

the lower part of the high-pressure cleaning device FIG. 3 without the assembly and without the upper half shell;

FIG. 6:

a plan view of the lower part FIG. 3 in the assembled state and

FIG. 7:

the lower part FIG. 6 after removing the upper half shell.

A preferred embodiment of a high-pressure cleaning device according to the invention is in FIG. 1 shown in perspective and there occupied by the reference numeral 10. It has a front 12, a back 13, a left side 14, a right side 15, an upper side 16 and a lower side 17.

The high-pressure cleaner 10 includes a in the FIGS. 3 to 7 illustrated lower part 18 with a chassis 20, on the near the back 13 on the left side 14 and the right side 15 two rotatable about a common axis of rotation 22 wheels 23 and 24 are held. Near the front 12, the high pressure cleaning device 10 on the bottom 17 on several support elements, of which only one support leg 25 can be seen. About these support elements and the wheels 23 and 24, the high-pressure cleaner 10 can stand on a footprint 26.

Above the lower part 18, a heatable heat exchanger 28 is arranged standing in a manner not shown. In FIG. 1 The housing 30 comprises a hood 32 in the region of the front side 12 and the front side 12 facing portions of the left side 14 and the right side 15. Further, the housing 30 comprises a Housing wall 34 in the region of the back 13 and the rear side 13 facing portions of the left side 14 and the right side 15th

By means of a handle in the form of a handle 36, the high-pressure cleaner 10 can be tilted about the support points of the wheels 23 and 24 on the footprint 26 and moved like a sack truck on the footprint 26.

A hose drum 38 held on the upper side 16 serves to receive a high-pressure hose, not shown in the drawing, which can be connected to the outlet of the heat exchanger 28.

In order to set by means of the high-pressure cleaning device 10 a liquid supplied to it, for example water, under pressure, which can be heated by means of the heatable heat exchanger 28, the high-pressure cleaning device 10 has an in FIG. 2 in an exploded view assembly 40 shown on. The assembly 40 comprises a motor 42 with a drive shaft 46 defining a drive axle 44, a pump unit 48, a fan wheel 50, an impeller 52 and a fuel pump 54. The motor 42 is designed as an electric motor and the pump unit 48 designed as an axial piston pump is connected to it flanged so that the motor 42 and the pump unit 48 form a common unit 56.

The pump unit 48 forms in the axial direction, based on the drive shaft 44, a first end of the assembly 40. To form an axial piston pump, the pump unit 48, a pump head 57, a pump block 58 and a swash plate assembly 59, so that the pump unit 48 in a known manner is driven by the drive shaft 46. In addition, the drawing shows a supply line 60 for pressurized liquid and a connection element 61 on the pump head 57 for a discharge line, not shown, to supply the heat exchanger 28 pressurized liquid.

The fan wheel 50 is held on the drive unit 46 on the side facing away from the pump unit 48 of the motor 42 immediately upstream of the motor 42, so that it can be driven by the drive shaft 46. It is designed as Axiallüfterrad.

The impeller 50 in the direction of the drive shaft 44 is preceded by the impeller 52, which is designed as a radial fan. It has the shape of a Cupfes and comprises a transverse to the drive shaft 44 oriented support disk 62. At this are held in the circumferential direction of the drive shaft 44 parallel to this extending fan blades 64. The impeller 52 is also held on the drive shaft 46 and driven by this.

To the impeller 52 is on its side facing away from the fan 50, the fuel pump 54 rotatably coupled by means of a coupling member 66, so that the fuel pump 54 is driven by the drive shaft 46. The fuel pump 54, based on the drive shaft 44, in the axial direction, a second end of the assembly 40. With a first fuel line, not shown in the drawing, the fuel pump 54 with a reservoir, not shown in the drawing for fuel, located on the right Page 15 is located below the housing 30, are connected. By driving the fuel pump 54 by means of the drive shaft 46, fuel can be supplied to the heat exchanger 28 through a second fuel line, also not shown in the drawing.

The structure of the assembly 40 described above, in which the pump unit 48, the fan 50, the impeller 52 and the fuel pump 54 are driven by the drive shaft 46, allows a compact design of the high-pressure cleaner 10, in which the sole drive of the motor 42 is used can come. There is thus no space needed for an additional drive.

Furthermore, the manner described below, as the assembly 40 is installed in the high-pressure cleaner 10, its compact design and its ease of installation and ease of maintenance favors. The chassis 20, the manufacturing technology is simple and inexpensive integrally made of a plastic material comprises for receiving the assembly 40 an elongated and transverse to a central longitudinal axis 68 of the high-pressure cleaner 10 oriented receptacle 70. This extends in the transverse direction of the high-pressure cleaner 10 approximately between the chassis 20th In the longitudinal direction of the high-pressure cleaning device 10, the receptacle 70 is arranged approximately in the region of its center between the front side 12 and the rear side 13 (FIG. FIGS. 3 to 7 ).

A bottom wall 74 delimiting the receptacle 70 on its front side 12 and on its side facing the rear side 13 extends horizontally in sections, whereas it is recessed in the direction of the underside 17 approximately in the region of the center of the high-pressure cleaning device 10, with respect to its longitudinal direction. In one, based on the total width of the high-pressure cleaner 10, narrow wall portion 76 near the edge 71, the bottom wall 74 extends horizontally. In a corresponding manner, the bottom wall 74 extends in a, relative to the width of the high-pressure cleaner 10, narrow wall portion 78 near the edge 72 horizontally. The wall portion 78 is also provided with a plurality of openings 80.

Between the wall sections 76 and 78, the bottom wall 74 extends in the direction of the bottom 18 arcuate. In this way, the chassis 20 forms a groove 82 in the transverse direction of the high-pressure cleaning device 10.

A first channel section 84 having a wall section 86 of the bottom wall 74 adjoins the wall section 76 and extends therefrom approximately to three quarters of the distance of the edge 71 from the edge 72. On this Way assumes the first channel section 84 approximately a length which corresponds to half the width of the high-pressure cleaner 10. At its wall portion 76 facing the end of numerous openings 88 are arranged in its wall portion 86.

A second channel section 90 adjoins the wall section 78. It is deeper and in the longitudinal direction of the high-pressure cleaner 10 wider than the first channel portion 84, and it comprises a wall portion 92 as part of the bottom wall 74, which forms a larger "arc" as the wall portion 86. In the transverse direction of the high-pressure cleaner 10, it is narrow such that it extends from the edge 72 approximately up to one fifth of the distance of the edge 71 from the wall portion 78.

A third gutter section 94 forms a narrow transition region between the first gutter section 84 and the second gutter section 90. It is less wide and less deep than the gutter sections 84 and 90 and comprises a lattice-like wall section 96 as part of the bottom wall 74 with a plurality of openings 98 ,

The channel 82 is half-round in the region of the three channel sections 84, 90 and 94. In this way, the chassis 20 between the wall sections 76 and 78 forms a channel-shaped first half shell 100 of a half-shell housing 102 of the high-pressure cleaner 10. A second half-shell 104 of the half-shell housing 102, which cooperates with the first half-shell 100, will be discussed below.

In the half-space bounded on the lower side by the first half-shell 100, the assembly 40 can be used for mounting the high-pressure cleaning device 10 be, as this particular from the Figures 3 and 7 becomes clear. The structural unit 40 can be inserted into the first half-shell 100 in such a way that the drive axle 44 is aligned with a horizontal orientation parallel to the rotational axis 22 and perpendicular to the central longitudinal axis 68. On the motor 42 are projections 105 and 106 held in the form of molded pins. They can engage in associated semi-circular recesses 107 and 108, which are formed on the first channel section 84 in the region of the central longitudinal axis 68. This makes it possible to fix the assembly 40 relative to the first half shell 100 and thus also to the half shell housing 102 in the axial and radial directions, based on the "proper" alignment of the drive shaft 44. By means of two support elements 109 and 110 on the pump head 57 can the assembly 40 further supported on the wall portion 76.

Another support on the chassis 20 learns the assembly 40 characterized in that a holding element 112 of the half-shell 100 between the wall portion 78 and the second channel portion 90 engages positively in a gap-shaped receptacle 114 on the fuel pump 54. This causes an axial and radial fixation of the fuel pump 54 and thus also of the assembly 40 relative to the first half shell 100, based on the "proper" orientation of the drive shaft 44th

The assembly 40 is inserted into the first half-shell 100, it takes their in FIG. 7 shown location. In this case, the motor 42 and the fan 50 are each arranged halfway in the first channel section 84, and the fan 52 is disposed halfway in the second channel section 90. The pump unit 48 is disposed in a space above the wall portion 76, and the fuel pump 54 is disposed in a space above the wall portion 78.

The already mentioned second half-shell 104 of the half-shell housing 102 is inexpensive and manufacturing technology simply formed from one-piece plastic molded part. It is essentially configured in the form of an upside-down channel and forms a cover 118 in order to partially cover the assembly 40 inserted into the first half-shell 100 ( Figures 3 . 4 and 6 ). The second half-shell 104 is designed to be complementary to the first half-shell 100, wherein the cover 118 comprises an arch-shaped and substantially semicircular top wall 120:

The lid 118 has a first lid portion 122, which is designed to be complementary to the first groove portion 84. With a wall section 124 of the ceiling wall 120, the first cover section 122 is able to cover the assembly 40 in the axial direction from the fan wheel 50 approximately to the middle of the motor 42. This means that approximately half of the motor 42 facing the pump unit 48 is not covered by the first cover section 122. In this way, the unit 56 passes through the motor 42 and the pump unit 48 in the axial direction of the drive shaft 44, an opening of the half-shell housing 102, which is designed to be open on its left side 14 facing the front end.

The cover 118 also has a second cover section 126, which is designed to be complementary to the second channel section 90 and comprises a wall section 128 as part of the ceiling wall 120. The wall portion 128 is capable of spreading over the impeller 52. The second cover section 126, facing the front side 12, forms a connection element 130 with an outlet opening 132 for combustion air conveyed by the impeller 52. To the connection element 130, a combustion air duct, not shown in the drawing, can be connected in order to supply combustion air to the heat exchanger 28.

The front side, facing the right side 15, the second cover portion 126 has a transverse to the drive shaft 44 oriented wall 134 with a plurality of openings 136. The wall 134 can also engage in the gap-shaped receptacle 114 on the fuel pump 54 and so the assembly 40 together fix with the retaining element 112.

The support plate 62 of the impeller 52 closes the space formed by the second channel portion 90 and the second cover portion 126 for the impeller 52 in the axial direction to the above the third channel portion 94 formed space area.

The first lid portion 122 is connected to the second lid portion 126 via a plurality of webs 138 which, relative to the drive axis 44, extend radially and which are parallel thereto. The webs 138 are arranged in this way above the third channel section 94. A separate portion of the ceiling wall 122 is not present in this area. Between the webs 138 a plurality of inlet openings 140 are formed for sucked by the fan 50 air.

In addition, the lid 118 still forms two semicircular recesses, which cooperate with the already mentioned recesses 107 and 108 for fixing the projections 105 and 106 and thus the assembly 40 on the half-shell housing 102.

The fastening of the second half-shell 104 and the first half-shell 100 takes place here solely by four fastening elements in the form of screws 142, which pass through the first cover section 122 and are anchored to the chassis 20 ( FIG. 3 ).

As the above description shows, the use of the half-shell housing 102 with the two half-shells 100 and 104 allows a compact construction of the high-pressure cleaner 10 and facilitates the assembly of the assembly 40 on the high-pressure cleaner 10 and its maintenance. The pump unit 48 and the fuel pump 54 are not in the receiving space 144 formed between the half-shells 100 and 104 (in FIG FIG. 7 as half space recognizable), but they are arranged outside of the half-shell housing 102. Since maintenance of the high-pressure cleaner 10 occasionally requires work on the pump unit 48 and / or on the fuel pump 54, the pump unit 48 and the fuel pump 54 can be reached by a user in this manner. In particular, it is not necessary to detach the second half-shell 104 from the first half-shell 100 in order to perform such maintenance. Further, the half-shell housing 102 provides effective protection for the impeller 52, the fan 50 and the fan wheel 50 facing half of the motor 42 from external influences and immediate access by a user. There is little or no need for maintenance at these components of the assembly 40, so that opening of the half-shell housing 102 is only very rarely required.

In an implementation of the high-pressure cleaning device 10, it has been found to be beneficial that are formed by the above-described embodiment of the half-shell housing 102 so to speak, two axially spaced housing sections, namely a fan housing 146 for the impeller 52 and a flow channel 148 for the fan 50 and the motor 42nd ( FIG. 6 ).

The blower housing 146 is essentially limited by the wall sections 92 and 126, the wall 134, the connecting element 130 and the support disk 62 of the blower 52. Combustion air for the heat exchanger 28 can be sucked from the interior of the high-pressure cleaner 10 under the hood 32 and through the openings 80 of the wall portion 78 through from the atmosphere. This ensures that the heat exchanger 28 at least partially fresh air is supplied from the atmosphere, which has proven in practice to be favorable for its operation. For example, air drawn in by the impeller 52 may pass through the apertures 136 of the wall 134 or flow past the retainer 112, and the combustion air flow may exit the fan housing 146 via the exit aperture 132, as previously noted. The carrier disk 62 forms a certain seal of the fan housing 146 in the axial direction, relative to the drive axle 44.

In order to ensure that enough air for cooling the motor 42 can be provided to the fan wheel 50, the half shell housing 102 comprises the third channel section 94 and the corresponding section of the cover 118, so that a gap 150 is formed between the fan wheel 52 and the fan wheel 50 , From the fan 50 sucked cooling air can enter the half-shell housing 102 on the one hand through the openings 98 of the wall portion 96 from the atmosphere and on the other from the interior of the high-pressure cleaner 10 below the hood 32 through the inlet openings 140 between the webs 138. Also in this case ensures that the sucked air from the fan 50 fresh air is supplied from the atmosphere. It has been found that effectively a cooling air flow for the motor 42 can be provided, so that overheating of the same can be avoided.

In the region of the first channel section 84 and the first cover section 122, the contour of the half-shell housing 102 is modeled on the outer contour of the fan wheel 50 and the motor 42, so that the half-shell housing 102 forms the already mentioned flow channel 148 for the cooling air flow that can be generated by the fan wheel 50 in this area , Because the half-shell housing 102 is open on its front side facing the left side 14, the cooling air can escape from the half-shell housing 102. Through the openings 88 of the wall portion 86 ensures that at least a portion of the cooling air escapes into the atmosphere. As a result, a heat accumulation in the flow channel 148 and in the interior of the high-pressure cleaning device 10 under the hood 32 can be effectively avoided.

The arrangement of the assembly 40 with horizontal drive shaft 44 below the heat exchanger 28 favors, moreover, the very compact design of the high-pressure cleaner 10 with heatable heat exchanger 28th

Claims (18)

1. A high-pressure cleaning appliance (10), comprising a heatable heat exchanger (28) for heating a liquid that is dischargeable by the high-pressure cleaning appliance (10), a motor (42) having a drive shaft (46) that defines a drive axis (44), a pump unit (48) for increasing the liquid pressure, a blower wheel (52) for generating a combustion air flow, and a fuel pump (54) for delivering a fuel for the heat exchanger (28), wherein the pump unit (48), the blower wheel (52) and the fuel pump (54) are disposed along the drive axis (44) and are drivable by the drive shaft (46) and form an assembly (40) together with the motor (42), wherein the high-pressure cleaning appliance (10) comprises a half-shell housing (102) having a first half-shell (100) and a second half-shell (104) which between them define an accommodating chamber (144) in which the assembly (40) is at least partially accommodated, and wherein the pump unit (48) is at least partially disposed outside of the half-shell housing (102).
2. The high-pressure cleaning appliance according to Claim 1, characterised in that the high-pressure cleaning appliance (10) comprises, as a component part of the assembly (40), a fan (50) that is disposed along the drive axis (44) and is drivable by the drive shaft (46), for generating a cooling air flow that cools the motor (42).
3. The high-pressure cleaning appliance according to Claim 2, characterised in that the fan (50) is formed as an axial fan (50) held on the drive shaft (46) and, with regard to the drive axis (44), is disposed axially upstream of the motor (42).
4. The high-pressure cleaning appliance according to Claim 2 or Claim 3, characterised in that the fan (50) and the motor (42) are at least partially disposed in the accommodation chamber (144).
5. The high-pressure cleaning appliance according to Claim 4, characterised in that, in the region of the fan (50) and the motor (42), the half-shell housing (102) forms a flow channel (148), and in that, in the half-shell housing (102), at least one inlet opening (98, 140) for air sucked in by the fan (50) is formed axially upstream of the fan (50) with regard to the drive axis (44), and at least one outlet opening for the cooling air flow is formed axially downstream of the fan.
6. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the pump unit (48) forms, in the axial direction with regard to the drive axis (44), a first end of the assembly (40).
7. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the blower wheel (52) is disposed in the accommodating chamber (144).
8. The high-pressure cleaning appliance according to Claim 7, characterised in that, in the half-shell housing (102), at least one inlet opening (136) for air sucked in by the blower wheel (52) is formed axially upstream of the blower wheel (52) with regard to the drive axis (44), and/or in that, in the half-shell housing (102), at least one outlet opening (132) for the combustion air flow is formed.
9. The high-pressure cleaning appliance according to Claim 8, characterised in that the half-shell housing (102) forms a connecting element (130) for a combustion air channel which opens out via the outlet opening (132) into the accommodating chamber (144).
10. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the blower wheel (52) is formed as a radial fan (52) which is held on the drive shaft (46) and is disposed, in the axial direction with regard to the drive axis (44), on the side, facing away from the motor (42), of a fan (50) associated with the motor (42).
11. The high-pressure cleaning appliance according to Claim 10, characterised in that between the blower wheel (52) and the fan (50), in the axial direction with regard to the drive axis (44), an intermediate space (150) is formed which is delimited in the circumferential direction of the drive axis (44) by the half-shell housing (102) and into which air sucked in by the fan (50) enters through a plurality of inlet openings (98, 140) formed in the half-shell housing (102) in the circumferential direction of the drive axis (44).
12. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that an intermediate wall (62) oriented transverse to the drive axis (44) divides the accommodating chamber (144) with regard to the drive axis (44) axially into a first chamber region in which the combustion air flow is generated and into a second chamber region in which a cooling air flow is generated that cools the motor (42).
13. The high-pressure cleaning appliance according to Claim 12, characterised in that the intermediate wall (62) is formed by the blower wheel (52).
14. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the fuel pump (54) is disposed outside of the half-shell housing (102).
15. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that, in the axial direction with regard to the drive axis (44), the fuel pump (54) forms a second end of the assembly (40).
16. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the half-shell housing (102) has a holding element (112) which is aligned transverse to the drive axis (44) and on which the fuel pump (54) is held with regard to the drive axis (44) in the axial and/or radial direction.
17. The high pressure cleaning appliance according to any one of the preceding Claims, characterised in that the half-shell housing (102) is configured in a barrel-shaped manner and has an at least partially trough-shaped first half-shell (100) and/or second half-shell (104).
18. The high-pressure cleaning appliance according to any one of the preceding Claims, characterised in that the high-pressure cleaning appliance (10) comprises a chassis (20) which forms the first half-shell (100) and/or the second half-shell (104).

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