High-pressure cleaning device

Abstract

The invention relates to a high-pressure cleaning device (10) having a pump (60), a motor (58), a fuel-operated directly-heated heater (72) and a fan (62) for conveying combustion air to the directly-heated heater, the motor (58) having a motor housing (64) and a motor shaft (68), and the fan (62) having a fan housing (88) and a fan wheel (94). In order to improve the high-pressure cleaning device (10) such that the manufacturing and storage costs of different variants can be reduced, it is proposed according to the invention that the fan wheel (94) is connected to the motor shaft (68) in a rotationally fixed manner by means of a first adapter element (106) and the fan housing (88) is held on the motor housing (64) by means of a second adapter element (108).

Description

Field of the Invention

[0001] The present invention relates to a high-pressure cleaning device having a pump for conveying a cleaning liquid, a motor for driving the pump, a fuel-operated direct heater for heating the cleaning liquid, and a motor-driven blower for supplying combustion air to the direct heater. The motor has a motor housing and a motor shaft protruding from the motor housing, and the blower has a blower housing in which a blower wheel coupled to the motor shaft is arranged. Background Art

[0002] Such a high-pressure cleaning device enables a cleaning liquid, preferably water, to be placed under pressure by means of the pump and heated by means of the fuel-operated direct heater. The heated and pressurized cleaning liquid can be directed at the object to be cleaned. The direct heater usually operates with a gaseous or liquid fuel and can have a coil that is heated by a burner and through which the cleaning liquid is guided. The combustion air can be supplied to the direct heater by means of a motor-driven blower. Such high-pressure cleaning devices are known, for example, from DE 30 01 571 A1 and EP 2 488 309 B1.

[0003] Typically, the motor and the blower are coordinated such that the blower housing can be directly connected to the motor housing and the blower wheel can be directly connected to the end section of the motor shaft protruding from the motor housing. However, different variants of the high-pressure cleaning device are usually used, which differ, for example, in the dimensions of the blower housing and the blower wheel or in the power, speed, and cooling type of the motor. This makes it necessary to provide a plurality of blower variants, each of which is adapted to a specific motor variant. As a result, the manufacturing and storage costs are significantly increased. Summary of the Invention

[0004] Accordingly, it is an object of the present invention to improve a heatable high-pressure cleaning device of the above type such that the manufacturing and storage costs for different variants of the high-pressure cleaning device can be reduced.

[0005] According to the invention, this object is achieved in a high-pressure cleaning device of this type in such a way that the blower wheel is non-rotatably connected to the motor shaft via a first adapter element, and the blower housing is held on the motor housing via a second adapter element.

[0006] What can be achieved by the high-pressure cleaning device according to the invention is that the number of fan variants to be prepared for different variants of the high-pressure cleaning device can be significantly reduced, because the fan does not have to be adapted to a specific motor separately. Instead, the adaptation of the fan to the motor is achieved by means of a first adapter element and a second adapter element, and these two adapter elements form a connection mechanism between the fan and the motor. Therefore, fans of the same design can be connected to different motors, for example, because the fan is adapted to the motor by means of the adapter element. In a corresponding manner, motors of the same design can also be connected to different fans. Therefore, the number of fan and motor variants to be prepared can be significantly reduced, and this can in turn reduce the manufacturing and warehousing costs of different variants of the high-pressure cleaning device.

[0007] Advantageously, the first adapter element can be placed, in particular press-fitted, onto the end section of the motor shaft protruding from the motor housing in the axial direction in the case of forming an anti-relative rotation connection, and can be firmly arranged on the motor shaft in the axial direction. In this design, the first adapter element can be placed onto the end section protruding from the motor housing in the axial direction in the case of establishing an anti-relative rotation connection between the first adapter element and the motor shaft. In particular, it can be provided that the first adapter element can be press-fitted onto the end section of the motor shaft in the case of establishing an anti-relative rotation connection. In order to prevent the first adapter element placed on the motor shaft from separating from the motor shaft, the first adapter element can be firmly arranged on the motor shaft in the axial direction.

[0008] The axial firm arrangement of the first adapter element on the end section of the motor shaft protruding from the motor housing can be achieved, for example, by means of a screw connection.

[0009] Advantageously, the end section of the motor shaft protruding from the motor housing has axially parallel blind holes with internal threads, and fastening screws passing through the first adapter element in the axial direction can be screwed into the internal threads.

[0010] In an advantageous design of the invention, the end section of the motor shaft protruding from the motor housing has form-locking elements, and these form-locking elements are evenly distributed on the periphery of the end section and are oriented parallel to the motor axis to form form-locking with the first adapter element.

[0011] For example, the form-locking elements can be designed in the form of grooves oriented parallel to the motor axis. The first adapter element can have axially oriented through holes and can be press-fitted onto the end section of the motor shaft protruding from the motor housing. When press-fitted onto the end section, internal grooves complementary to the external grooves of the motor shaft can be formed on the walls of the through holes.

[0012] In a preferred design of the present invention, the fan wheel is installed on the first adapter element in a particularly simple manner, that is, the fan wheel has a hub which can be placed on the first adapter element in the axial direction in a connection that resists relative rotation, and can be firmly arranged on the first adapter element in the axial direction. For installation, the fan wheel can be simply placed on the connection section of the first adapter element in the axial direction in a connection that resists relative rotation between the first adapter element and the fan wheel, and in order to prevent the fan wheel from inadvertently separating from the first adapter element, the hub of the fan wheel can be firmly arranged on the first adapter element in the axial direction.

[0013] For example, the hub of the fan wheel can be firmly arranged on the first adapter element by means of fastening screws.

[0014] It can be provided that the fan wheel and the first adapter element can be firmly arranged on the end section of the motor shaft protruding from the motor housing by means of fastening screws. For example, the hub can be designed as hollow and have a radially inwardly directed flange which abuts against the end section of the first adapter element facing away from the motor shaft, and the fastening screw can pass through the flange and the first adapter element in the axial direction and be screwed into the axially oriented blind hole with internal thread in the end section of the motor shaft.

[0015] Advantageously, the first adapter element has radially outwardly directed protrusions evenly distributed on its periphery, and these protrusions sink into the complementary designed recesses in the hub of the fan wheel. Through the radially oriented protrusions and the complementary designed recesses, a connection that resists relative rotation between the hub of the fan wheel and the first adapter element can be achieved in a simple manner.

[0016] Advantageously, the second adapter element forms an adapter ring that can be placed on the motor housing, and this adapter ring can be detachably connected to the motor housing.

[0017] In particular, it can be provided that the adapter ring can be screwed to the motor housing.

[0018] The fan housing preferably has a first housing part and a second housing part, wherein the two housing parts can be detachably connected to each other, and wherein the first housing part can be detachably connected to the second adapter element.

[0019] Advantageously, the first housing part can be screwed to the second adapter element.

[0020] In a preferred design of the present invention, the first housing part is simply installed on the second adapter element in the following manner, that is, the second adapter element has a plurality of retaining bolts facing the first housing part, and the first housing part can be placed on the retaining bolts.

[0021] Preferably, the first housing part has a plurality of retaining sleeves which can be placed on the retaining bolts respectively.

[0022] The retaining bolts are advantageously axially oriented.

[0023] Particularly advantageously, the retaining bolts are designed to be hollow, into which fastening screws connecting the first housing part to the second adapter element can be screwed.

[0024] Advantageously, the first housing part has retaining sleeves which can be plugged onto the retaining bolts respectively, and the screw heads of the fastening screws bear against the retaining sleeves respectively with a spacer arranged in the middle.

[0025] Particularly advantageously, the motor drives not only the pump and the fan, but additionally also a fuel pump with which a liquid fuel, such as heating oil or diesel oil, can be supplied to a direct heater. Advantageously, the fan wheel is coupled to the drive shaft of the fuel pump via a follower. In this design of the invention, the fan wheel rotating by the motor can be coupled to the drive shaft of the fuel pump via the follower, so that the rotational movement of the fan wheel can be transmitted to the drive shaft of the fuel pump via the follower.

[0026] The first adapter element is preferably made of metal, for example made of die-cast material, in particular made of aluminum die-cast material.

[0027] The second adapter element is preferably made of plastic material. Description of the Drawings

[0028] The following description of the preferred embodiments of the invention is used for further explanation in conjunction with the drawings. Among them:

[0029] Figure 1 A first perspective view of the high-pressure cleaning device is shown;

[0030] Figure 2 A second perspective view of the high-pressure cleaning device is shown, wherein Figure 2 the fuel tank, the control device and the cover of the high-pressure cleaning device are hidden to achieve a better overview;

[0031] Figure 3 A perspective view of the type of exploded view of the fan is shown, which is connected to the motor of the high-pressure cleaning device via the first adapter element and the second adapter element; Figure 1 of the high-pressure cleaning device;

[0032] Figure 4 is shown Figure 3 an enlarged view of detail X of;

[0033] Figure 5Shows a side view of a high-pressure cleaning device;

[0034] Figure 6 Shows Figure 1 of the high-pressure cleaning device along Figure 5 a partial sectional view taken along line 6-6 in

[0035] Figure 7 Shows Figure 1 of the high-pressure cleaning device along Figure 5 a partial sectional view taken along line 7-7 in. Detailed Description

[0036] In the drawings, advantageous embodiments of a high-pressure cleaning device according to the invention are schematically shown, and the high-pressure cleaning device is generally designated by the reference numeral 10. The high-pressure cleaning device 10 includes two running wheels 12, 14 and a swivel roller 16, which are rotatably supported on a bottom plate 18. The main movement direction of the high-pressure cleaning device 10 is shown by an arrow 20 in Figure 1 ..

[0037] The bottom plate 18 is screwed to a pipe frame 22, and the pipe frame forms a front frame section 24 with respect to the main movement direction 20. The front frame section 24 is designed in a U-shape and is oriented substantially vertically with respect to the horizontal use position of the high-pressure cleaning device 10 shown in the drawings.

[0038] The front frame section 24 is connected to two frame sections 26, 28 that are spaced apart from each other and oriented parallel to the main movement direction 20. These two frame sections are rigidly connected to the side edges 34 or 36 of the U-shaped rear frame section 38 via connecting sections 30, 32, respectively. The side edges 34, 36 are oriented substantially vertically and are rigidly connected to each other by a bridging portion 40 that is oriented perpendicular to the main movement direction 20.

[0039] Opposite to the main movement direction 20, a handle 42 is connected to the rear frame section 38. The handle has two support side edges 44, 46 and a support bridging portion 48 that is oriented transversely to the main movement direction 20. The two support side edges 44, 46 are integrally connected to each other by the support bridging portion. Support connection sections 50 or 52 are connected to the ends of the support side edges 44, 46 that face away from the support bridging portion 48, respectively. The support connection sections 50, 52 are screwed to the side edges 34 or 36 of the rear frame section 38, respectively.

[0040] Between the front frame section 24 and the rear frame section 38, the bracket 54 is fixed to the base plate 18. The bracket 54 carries the structural unit 56, which has a motor 58, a pump 60 that can be driven by the motor 58, a fan 62 that can also be driven by the motor 58, and a fuel pump 63. The motor 58 is arranged between the pump 60 and the fan 62 and is designed as an electric motor. The motor has a motor housing 64, and a motor shaft 68 connected to a rotor 66 is rotatably supported in the motor housing. The rotor 66 is generally surrounded by a stator 70.

[0041] The pump 60 is flange-connected to the motor housing 64 on the side facing away from the fan 62 and is configured as a crankshaft pump in the illustrated embodiment. The cleaning liquid, preferably water, can be pressurized by means of the pump 60.

[0042] Combustion air can be conveyed to the direct-fired heater 72 by means of the fan 62, which operates with fuel and is arranged behind the rear frame section 38 with respect to the main movement direction 20. For this purpose, the fan 62 is flow-connected to the direct-fired heater 72 via an air guide hose 74.

[0043] The fuel tank 76 is arranged between the structural unit 56 and the front frame section 24. The fuel tank 76 is used to store liquid fuel, such as heating oil or diesel fuel, and the direct-fired heater 72 operates with this liquid fuel.

[0044] In the region between the rear frame section 38 and the fuel tank 76, the control device 78 is arranged above the structural unit 56. The control device is covered by a cover 82 except for the operation panel 80. The cover 82 has a notch 84 through which the user can access the operation panel 80 of the control device 78. Operation elements 86 are arranged on the operation panel 80, which are configured as switch buttons in the illustrated embodiment. The user can switch on and off the motor 58 by means of the operation elements 86. In addition, the control element 86 is used to select the operating mode of the motor 58.

[0045] The fan 62 has a fan housing 88, which is formed by a first housing part 90 facing the motor 58 and a second housing part 92 facing away from the motor 58. The two housing parts 90, 92 are each configured as housing half-shells and can be detachably connected to each other, in particular by screw connection.

[0046] In the blower housing 88, a blower wheel 94 is arranged, which has a hollow hub 98 oriented coaxially with the motor axis 96, and the hub is integrally connected to the carrier disk 100. A plurality of blower blades 102 are held on the carrier disk 100, which are oriented parallel to the motor axis 96 and can be rotated by the motor 58 about the motor axis 96 so as to suck ambient air into the blower housing 88 through the air inlet grille 104 arranged on the second housing part 92 and convey it to the direct-fired heater 72 via the air guiding hose 74.

[0047] The connection between the blower 62 and the motor 58 is realized by means of a first adapter element 106 and a second adapter element 108. This can be seen clearly especially from Figure 3 this.

[0048] The first adapter element 106 forms a connecting mechanism through which the motor shaft 68 is non-rotatably connected to the hub 98 of the blower 62. The motor shaft 68 has an end section (in the form of a shaft end 110) protruding from the motor housing 64 in the direction of the blower 62, which tapers via a radially inwardly directed step 112. Form-fitting elements (in the form of grooves 114 oriented parallel to the motor axis 96) evenly distributed on the periphery of the shaft end 110 in the direction of the blower 62 are connected to the step 112. The first adapter element 106 has a central notch 116 oriented coaxially with the motor axis 96 and can be press-fitted onto the shaft end 110 in the axial direction in the case of a non-rotatable connection being formed between the shaft end 110 and the first adapter element 106. When press-fitted onto the shaft end 110, an inner groove 118 complementary to the outer groove 114 of the shaft end 110 is formed on the wall of the central notch 116, and the inner groove forms a form fit with the outer groove 114 of the shaft end 100.

[0049] The step 112 of the shaft end 110 forms a stop surface against which the first adapter element 106 abuts, wherein a neck edge 120 of the first adapter element 106 oriented coaxially with the motor axis 96 form-fittingly surrounds the section of the shaft end 110 connected to the step 112 in the direction of the motor housing 64.

[0050] Spaced apart from the neck edge 120, the first adapter element 106 has a plurality of radially outwardly directed retaining wings 122 evenly distributed on the periphery of the first adapter element 106.

[0051] The hollow-designed hub 98 can be placed onto the first adapter element 106 in the axial direction, wherein the retaining wings 122 are respectively sunk into recesses 124 on the inner side of the hub 98 designed complementary to the retaining wings 122, so as to form a non-rotatable connection between the first adapter element 106 and the hub 98.

[0052] The inwardly directed flange 126 of the hub 98 is connected to the recess 124, and the flange abuts against the end section of the first adapter element 106 facing away from the neck edge 120. The fastening screw 128 passes through the notch 116 in the center of the flange 126 of the hub 98 and the first adapter element 106 and sinks into the blind hole 130 coaxial with the motor axis 96 at the shaft end 110. The blind hole 130 has an internal thread so that the fastening screw 128 can be screwed into the blind hole 130, wherein the spacer 132 abuts against the free ends of the flange 126 and the first adapter element 106, so that the hub 98 and the first adapter element 106 can be axially fixed to the shaft end 110 by means of the fastening screw 128.

[0053] The second adapter element 108 forms a connection mechanism through which the motor housing 64 is connected to the blower housing 88. The second adapter element 108 is designed in the form of an adapter ring coaxial with the motor axis 96, which can be placed on the end section 136 of the motor housing 64 facing the blower 62 and can be screwed to the motor housing 64 by means of fastening screws 138. In the illustrated embodiment, two radially opposed fastening screws 138, 139 are used.

[0054] On its side facing the blower 62, the adapter ring 134 has four identically designed retaining bolts 140, 142, 144, 146 evenly distributed around the perimeter. The first housing part 90 of the blower housing 88 has four retaining sleeves complementary to the retaining bolts 140, 142, 144, 146, wherein Figure 3 Three retaining sleeves 148, 150, 151 are shown. The retaining bolts 140, 142, 144, 146 are constructed as hollow. The first housing part 90 can be screwed to the retaining bolts 140, 142, 144, 146 by means of fastening screws 152, wherein the fastening screws 152 are constructed as self-tapping and can be screwed into the retaining bolts 140, 142, 144, 146 with a corresponding spacer 154 interposed, and the fastening screws abut against the retaining sleeves accommodating one of the retaining bolts 140, 142, 144, 146 each.

[0055] As already mentioned, in addition to the motor 58, the pump 60 and the blower 62, the structural unit 56 also has a fuel pump 63 through which fuel can be delivered from the fuel tank 76 to the direct heater 72. The fuel pump 63 is arranged on the side of the blower housing 88 facing away from the motor 58. The follower 158 is connected to the hub 98 of the blower wheel 94. For this purpose, the hub 98 has a receiving portion 160 on the side of the flange 126 facing away from the first adapter element 106, and the receiving portion has radially inwardly directed ribs 162 which interact with the follower 158 to rotate the drive shaft 164 of the fuel pump 63.

[0056] Two adapter elements 106, 108 allow the fan 62 to be very easily mounted on the motor 58. Different fan variants can be mounted on the motor 58 in a simple manner, where the fan does not have to be adapted to the motor housing 64 and the motor shaft 68. Instead, this adaptation is achieved by means of two adapter elements 106, 108.

Claims

1. High-pressure cleaning device (10), said high-pressure cleaning device having a pump (60) for conveying cleaning liquid, a motor (58) for driving the pump (60), a fuel-operated direct heater (72) for heating the cleaning liquid, and a blower (62) driven by the motor (58) for supplying combustion air to the direct heater (72), wherein, the motor (58) has a motor housing (64) and a motor shaft (68) protruding from the motor housing (64), and wherein the blower (62) has a blower housing (88), in which a blower wheel (94) coupled to the motor shaft (68) is arranged, characterized in that the blower wheel (94) is connected to the motor shaft (68) against relative rotation by a first adapter element (106), and the blower housing (88) is held on the motor housing (64) by a second adapter element (108).

2. The high-pressure cleaning device according to claim 1, characterized in that, the first adapter element (106) can be axially placed on an end section (110) of the motor shaft (68) protruding from the motor housing (64) in the case of forming a connection against relative rotation, and can be firmly arranged axially on the end section (110).

3. The high-pressure cleaning device according to claim 2, characterized in that, the end section (110) has form-locking elements, which are evenly distributed on the periphery of the end section (110) and are oriented parallel to the motor axis (96) to form form-locking with the first adapter element (106).

4. The high-pressure cleaning device according to claim 3, characterized in that, the form-locking elements are designed in the form of grooves (114) oriented parallel to the motor axis (96).

5. The high-pressure cleaning device according to any one of the preceding claims, characterized in that, the blower wheel (94) has a hub (98), which can be axially placed on the first adapter element (106) in the case of forming a connection against relative rotation, and can be firmly arranged axially on the first adapter element (106).

6. The high-pressure cleaning device according to claim 5, characterized in that, the first adapter element (106) has radially outwardly directed protrusions (122) evenly distributed on its periphery, and the protrusions sink into complementary designed recesses (124) of the hub (98).

7. The high-pressure cleaning device according to any one of the preceding claims, characterized in that, the second adapter element (108) forms an adapter ring (134) that can be placed on the motor housing (64), and the adapter ring can be detachably connected to the motor housing (64).

8. The high-pressure cleaning device according to any one of the preceding claims, characterized in that, The blower housing (88) has a first housing part (90) and a second housing part (92), the first housing part and the second housing part being detachably connectable to one another, wherein the first housing part (90) is detachably connectable to the second adapter element (108).

9. The high-pressure cleaning device according to claim 8, characterized in that the second adapter element (108) has a plurality of retaining bolts (140, 142, 144, 146) facing the first housing part (90), onto which the first housing part (90) can be placed.

10. The high-pressure cleaning device according to claim 9, characterized in that the retaining bolts (140, 142, 144, 146) are designed to be hollow, and fastening screws for connecting the first housing part (90) to the second adapter element (108) can be screwed into the retaining bolts (140, 142, 144, 146).

11. The high-pressure cleaning device according to any one of the preceding claims, characterized in that the blower wheel (94) is coupled to the drive shaft (164) of the fuel pump (63) by means of a follower (158).

12. The high-pressure cleaning device according to any one of the preceding claims, characterized in that the first adapter element (106) is made of metal.

13. The high-pressure cleaning device according to any one of the preceding claims, characterized in that the second adapter element (108) is made of plastic material.

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