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 flow heater (72) and a fan (62) for supplying combustion air to the flow heater, wherein the motor (58) has a motor housing (64) and a motor shaft (68), and wherein the fan (62) has a fan housing (88) and a fan impeller (94). In order to develop the high-pressure cleaning device (10) in such a way that the costs of production and storage for different variants can be reduced, the invention proposes for the fan impeller (94) to be non-rotationally connected to the motor shaft (68) by means of a first adapter element (106), and for the fan housing (88) to be held on the motor housing (64) by means of a second adapter element (108).

Description

[0001] HIGH-PRESSURE CLEANING DEVICE

[0002] The invention relates to a high-pressure cleaning device with a pump for conveying a cleaning fluid, a motor for driving the pump, a fuel-operated continuous-flow heater for heating the cleaning fluid and a fan driven by the motor for supplying combustion air to the continuous-flow heater, wherein the motor has a motor housing and a motor shaft projecting from the motor housing, and wherein the fan has a fan housing in which an impeller coupled to the motor shaft is arranged.

[0003] Such high-pressure cleaning devices make it possible to pressurize a cleaning fluid, preferably water, using a pump and heat it using a fuel-powered instantaneous water heater. The heated and pressurized cleaning fluid can be directed onto an object to be cleaned. The instantaneous water heater is typically powered by a gaseous or liquid fuel and can have a coiled tube heated by a burner through which the cleaning fluid is passed. Combustion air can be supplied to the instantaneous water heater by means of a fan driven by the engine. Such high-pressure cleaning devices are known, for example, from DE 30 01 571 A1 and EP 2 488 309 B1.

[0004] Typically, the motor and blower are matched so that the blower housing can be directly connected to the motor housing, and the impeller can be directly connected to an end section of the motor shaft protruding from the motor housing. However, different variants of high-pressure cleaning devices are often used, differing, for example, in the size of the blower housing and impeller, or in the power, speed, and cooling method of the motors. This makes it necessary to provide a variety of blower variants, each adapted to a specific motor variant. This significantly increases manufacturing and storage costs.

[0005] The object of the present invention is therefore to further develop a heatable high-pressure cleaning device of the type mentioned at the outset in such a way that the manufacturing and storage costs for different variants of the high-pressure cleaning device can be reduced.

[0006] This object is achieved according to the invention in a high-pressure cleaning device of the generic type in that the fan wheel is connected in a rotationally fixed manner to the motor shaft via a first adapter element and in that the fan housing is held on the motor housing via a second adapter element.

[0007] The high-pressure cleaning device according to the invention makes it possible to significantly reduce the number of blower variants required for different versions of the high-pressure cleaning device, since the blowers do not each have to be adapted to a specific motor. Instead, the blowers are adapted to the motors using a first adapter element and a second adapter element, which form the connecting links between the blowers and the motors. For example, identically designed blowers can be connected to different motors, since the adapter elements are used to adapt the blowers to the motors. Similarly, identically designed motors can also be connected to different blowers.The number of blower and motor variants that need to be kept in stock can thus be significantly reduced, which in turn makes it possible to reduce the manufacturing and storage costs for different variants of the high-pressure cleaning device.

[0008] It is advantageous if the first adapter element can be placed, in particular pressed, onto an end section of the motor shaft protruding from the motor housing to form a rotationally fixed connection in the axial direction, and can be secured to the motor shaft in the axial direction. With such a configuration, the first adapter element can be placed in the axial direction onto the end section protruding from the motor housing to create a rotationally fixed connection between the first adapter element and the motor shaft. In particular, it can be provided that the first adapter element can be pressed onto the end section of the motor shaft to create a rotationally fixed connection. In order to prevent the first adapter element placed on the motor shaft from becoming detached from the motor shaft, it can be secured to the motor shaft in the axial direction.

[0009] The axial fixing of the first adapter element to the end section of the motor shaft protruding from the motor housing can be achieved, for example, by means of a screw connection.

[0010] It is advantageous if the end section of the motor shaft protruding from the motor housing has a blind bore parallel to the axis with an internal thread into which a fastening screw can be screwed that passes through the first adapter element in the axial direction.

[0011] In an advantageous embodiment of the invention, the end section of the motor shaft protruding from the motor housing has form-locking elements which are arranged uniformly distributed over the circumference of the end section and are aligned parallel to a motor axis to form a form-locking connection with the first adapter element.

[0012] The form-locking elements can, for example, be designed in the form of grooves aligned parallel to the motor axis. The first adapter element can have an axially aligned through-bore and can be pressed onto the end section of the motor shaft protruding from the motor housing. When pressed onto the end section, internal grooves complementary to the external grooves of the motor shaft can form on the wall of the through-bore. A particularly simple assembly of the impeller on the first adapter element is achieved in a preferred embodiment of the invention in that the impeller has a hub which can be placed axially onto the first adapter element to form a rotationally fixed connection and can be secured axially to the first adapter element.For assembly, the impeller can be easily placed in the axial direction onto a connecting portion of the first adapter element, forming a rotationally fixed connection between the first adapter element and the impeller, and in order to prevent the impeller from accidentally becoming detached from the first adapter element, the hub of the impeller can be fixed in the axial direction to the first adapter element.

[0013] The hub of the impeller can be fixed to the first adapter element, for example, using a fastening screw.

[0014] It can be provided that both the impeller and the first adapter element can be secured to the end section of the motor shaft protruding from the motor housing by means of the fastening screw. For example, the hub can be hollow and have a radially inwardly directed collar that rests against an end section of the first adapter element facing away from the motor shaft. The fastening screw can penetrate the collar and the first adapter element in the axial direction and be screwed into an axially aligned, internally threaded blind bore in the end section of the motor shaft.

[0015] It is advantageous if the first adapter element has radially outward-directed projections evenly distributed over its circumference, which engage complementarily designed recesses in the hub of the impeller. By means of the radially aligned projections and the complementary recesses, a rotationally fixed connection between the hub of the impeller and the first adapter element can be easily achieved. It is advantageous if the second adapter element forms an adapter ring that can be placed on the motor housing and detachably connected to the motor housing.

[0016] In particular, it can be provided that the adapter ring can be screwed to the motor housing.

[0017] The blower housing preferably has a first housing part and a second housing part, wherein the two housing parts are detachably connectable to one another and wherein the first housing part is detachably connectable to the second adapter element.

[0018] It is advantageous if the first housing part can be screwed to the second adapter element.

[0019] In a preferred embodiment of the invention, simple assembly of the first housing part on the second adapter element is achieved in that the second adapter element has a plurality of retaining pins facing the first housing part, onto which the first housing part can be placed.

[0020] Preferably, the first housing part has a plurality of retaining bushings, each of which can be placed on a retaining pin.

[0021] The retaining pins are advantageously aligned axially.

[0022] It is particularly advantageous if the retaining pins are hollow, wherein fastening screws connecting the first housing part to the second adapter element can be screwed into the retaining pins. It is advantageous if the first housing part has retaining bushings, each of which can be plugged onto a retaining pin, wherein the screw heads of the fastening screws each rest against a retaining bushing with a washer interposed.

[0023] It is particularly advantageous if the motor not only drives the pump and the blower but also a fuel pump, which can be used to supply the instantaneous water heater with liquid fuel, such as heating oil or diesel. In this case, it is advantageous if the impeller is coupled to a drive shaft of the fuel pump via a driver. In such an embodiment of the invention, the impeller, which can be rotated by the motor, is coupled to the drive shaft of the fuel pump via a driver, so that the rotational movement of the impeller can be transmitted to the drive shaft of the fuel pump via the driver.

[0024] The first adapter element is preferably made of metal, for example of a die-cast material, in particular of an aluminum die-cast material.

[0025] The second adapter element is preferably made of a plastic material.

[0026] The following description of a preferred embodiment of the invention serves to explain it in more detail in conjunction with the drawings. They show:

[0027] Figure 1: a first perspective view of a high-pressure cleaning device;

[0028] Figure 2: a second perspective view of the high-pressure cleaning device, wherein in Figure 2, a fuel tank, a control device, and a hood of the high-pressure cleaning device are hidden to provide a better overview; Figure 3: a perspective view in the manner of an exploded drawing of a fan connected to a motor of the high-pressure cleaning device from Figure 1 via a first adapter element and a second adapter element;

[0029] Figure 4: an enlarged view of detail X from Figure 3;

[0030] Figure 5: a side view of the high-pressure cleaning device;

[0031] Figure 6: a partial sectional view of the high pressure cleaning device of Figure 1 taken along line 6-6 in Figure 5;

[0032] Figure 7: a partial sectional view of the high-pressure cleaning device of Figure 1 taken along line 7-7 in Figure 5.

[0033] The drawing schematically illustrates an advantageous embodiment of a high-pressure cleaning device according to the invention, which is designated overall by the reference numeral 10. The high-pressure cleaning device 10 comprises two wheels 12, 14 and a castor 16, which are rotatably mounted on a base plate 18. A main direction of movement of the high-pressure cleaning device 10 is illustrated in Figure 1 by the arrow 20.

[0034] The base plate 18 is screwed to a tubular frame 22, which forms a front frame section 24 relative to the main direction of movement 20. The front frame section 24 is U-shaped and is oriented substantially vertically relative to the horizontal operating position of the high-pressure cleaning device 10 shown in the drawing.

[0035] The front frame section 24 is adjoined by two longitudinal frame sections 26, 28, spaced apart from one another and aligned parallel to the main movement direction 20, each of which is rigidly connected via a connecting section 30, 32 to a leg 34 or 36 of a U-shaped rear frame section 38. The legs 34, 36 are essentially vertically aligned and rigidly connected to one another via a web 40 aligned perpendicular to the main movement direction 20.

[0036] Adjoining the rear frame section 38, opposite the main direction of movement 20, is a handle bar 42 having two bar legs 44, 46 and a bar web 48 oriented transversely to the main direction of movement 20, via which the two bar legs 44, 46 are integrally connected. A bar connecting section 50 or 52 is connected to the ends of the bar legs 44, 46 facing away from the bar web 48. The bar connecting sections 50, 52 are each screwed to a leg 34 or 36 of the rear frame section 38.

[0037] A bracket 54 is fixed to the base plate 18 between the front frame section 24 and the rear frame section 38. The bracket 54 supports a structural unit 56 comprising a motor 58, a pump 60 driven by the motor 58, a fan 62 also 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. It has a motor housing 64 in which a motor shaft 68 connected to a rotor 66 is rotatably mounted. The rotor 66 is surrounded by a stator 70 in the usual manner.

[0038] The pump 60 is flanged to the motor housing 64 on the side facing away from the fan 62 and, in the illustrated embodiment, is designed as a crankshaft pump. The pump 60 can be used to pressurize a cleaning fluid, preferably water.

[0039] With the help of the fan 62, combustion air can be supplied to a flow heater 72, which is operated with liquid fuel and is arranged behind the rear frame section 38 with respect to the main direction of movement 20. For this purpose, the fan 62 is in fluid communication with the flow heater 72 via an air duct hose 74.

[0040] A fuel tank 76 is arranged between the structural unit 56 and the front frame section 24. The fuel tank 76 serves to store the liquid fuel, for example, heating oil or diesel fuel, which is used to operate the instantaneous water heater 72.

[0041] In the area between the rear frame section 38 and the fuel tank 76, a control device 78 is arranged above the assembly 56. This control device 78, with the exception of an operating panel 80, is covered by a hood 82. The hood 82 has an opening 84 through which the operating panel 80 of the control device 78 is accessible to the user. An operating element 86 is arranged on the operating panel 80, which in the illustrated embodiment is designed as a switch button. Using the operating element 86, the user can switch the engine 58 on and off. Furthermore, the operating element 86 is used to select an operating mode of the engine 58.

[0042] 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 designed as a housing half-shell and can be releasably connected to one another, in particular screwed together.

[0043] Arranged in the blower housing 88 is a blower wheel 94, which has a hollow hub 98 aligned coaxially with a motor axis 96 and is integrally connected to a support disk 100. A plurality of blower blades 102 are held on the support disk 100. These blades are aligned parallel to the motor axis 96 and can be rotated by the motor 58 about the motor axis 96 in order to draw ambient air into the blower housing 88 via a ventilation grille 104 arranged on the second housing part 92 and to supply this air to the flow heater 72 via the air guide hose 74. The connection of the blower 62 to the motor 58 is achieved by means of a first adapter element 106 and a second adapter element 108. This is particularly evident in Figure 3.

[0044] The first adapter element 106 forms a connecting link via which the motor shaft 68 is connected in a rotationally fixed manner to the hub 98 of the fan 62. The motor shaft 68 has an end section in the form of a shaft stub 110 that protrudes from the motor housing 64 in the direction of the fan 62 and tapers via a radially inwardly directed step 112. Adjoining the step 112 in the direction of the fan 62 are form-locking elements in the form of grooves 114 aligned parallel to the motor axis 96, evenly distributed around the circumference of the shaft stub 110. The first adapter element 106 has a central opening 116 aligned coaxially to the motor axis 96 and can be pressed onto the shaft stub 110 in the axial direction, forming a rotationally fixed connection between the shaft stub 110 and the first adapter element 106.When pressed onto the shaft stub 110, internal grooves 118 are formed on the wall of the central opening 116, complementary to the external grooves 114 of the shaft stub 110, which form a positive connection with the external grooves 114 of the shaft stub 110.

[0045] The step 112 of the shaft stub 110 forms a stop surface against which the first adapter element 106 rests, wherein a collar 120 of the first adapter element 106, which is aligned coaxially with the motor axis 96, positively surrounds a section of the shaft stub 110 which adjoins the step 112 in the direction of the motor housing 64.

[0046] At a distance from the collar 120, the first adapter element 106 has a plurality of radially outwardly directed retaining wings 122 arranged evenly distributed over the circumference of the first adapter element 106. The hollow hub 98 can be placed axially onto the first adapter element 106, with the retaining wings 122 each engaging an inner recess 124 of the hub 98 that is complementary to the retaining wings 122, thereby forming a rotationally fixed connection between the first adapter element 106 and the hub 98.

[0047] Adjacent to the recesses 124 is an inwardly directed collar 126 of the hub 98, which comes into contact with an end section of the first adapter element 106 facing away from the collar 120. A fastening screw 128 extends through the collar 126 of the hub 98 and the central opening 116 of the first adapter element 106 and penetrates into a blind bore 130 of the stub shaft 110, which is aligned coaxially with the motor axis 96. The blind bore 130 has an internal thread so that the fastening screw 128 can be screwed into the blind bore 130, with a washer 132 coming into contact with the collar 126 and the free end of the first adapter element 106, so that the hub 98 and the first adapter element 106 can be fixed in the axial direction to the stub shaft 110 by means of the fastening screw 128.

[0048] The second adapter element 108 forms a connecting link through which the motor housing 64 is connected to the fan housing 88. The second adapter element 108 is designed in the form of an adapter ring aligned coaxially with the motor axis 96, which can be placed on an end portion 136 of the motor housing 64 facing the fan 62 and screwed to the motor housing 64 by means of fastening screws 138. In the illustrated embodiment, two diametrically opposed fastening screws 138, 139 are used.

[0049] On its side facing the fan 62, the adapter ring 134 has four retaining pins 140, 142, 144, 146, which are evenly distributed around the circumference and are of identical design. The first housing part 90 of the fan housing 88 has four retaining bushings designed to complement the retaining pins 140, 142, 144, 146, with three retaining bushings 148, 150, 151 being shown in Figure 3. The retaining pins 140, 142, 144, 146 are hollow. By means of fastening screws 152, the first housing part 90 can be screwed to the retaining pins 140, 142, 144, 146, wherein the fastening screws 152 are self-tapping and can be screwed into the retaining pins 140, 142, 144, 146 with the interposition of a washer 154, which comes to rest on a retaining bushing which receives a retaining pin 140, 142, 144, 146.

[0050] As already mentioned, in addition to the motor 58, the pump 60, and the blower 62, the assembly 56 also includes the fuel pump 63, with the aid of which fuel from the fuel tank 76 can be supplied to the flow heater 72. The fuel pump 63 is arranged on the side of the blower housing 88 facing away from the motor 58. A driver 158 is connected to the hub 98 of the blower wheel 94. For this purpose, the hub 98 has a receptacle 160 on the side of the collar 126 facing away from the first adapter element 106, with radially inwardly directed ribs 162 that interact with the driver 158 to rotate a drive shaft 164 of the fuel pump 63.

[0051] The two adapter elements 106, 108 allow for very simple mounting of the fan 62 on the motor 58. Different fan variants can be easily mounted on the motor 58, whereby the fans do not need to be adapted to the motor housing 64 and the motor shaft 68. Rather, such adaptation is achieved using the two adapter elements 106, 108.

Claims

PATENT CLAIMS High-pressure cleaning device with a pump (60) for conveying a cleaning fluid, a motor (58) for driving the pump (60), a fuel-operated flow heater (72) for heating the cleaning fluid and a fan (62) drivable by the motor (58) for supplying combustion air to the flow heater (72), wherein the motor (58) has a motor housing (64) and a motor shaft (68) projecting from the motor housing (64), and wherein the fan (62) has a fan housing (88) in which a fan wheel (94) coupled to the motor shaft (68) is arranged, characterized in that the fan wheel (94) is connected to the motor shaft (68) in a rotationally fixed manner via a first adapter element (106), and in that the fan housing (88) is connected to the motor shaft (68) via a second adapter element (108) is held on the motor housing (64).High-pressure cleaning device according to claim 1, characterized in that the first adapter element (106) can be placed onto an end section (110) of the motor shaft (68) protruding from the motor housing (64) to form a rotationally fixed connection in the axial direction, and can be secured to the end section (110) in the axial direction. High-pressure cleaning device according to claim 2, characterized in that the end section (110) has form-locking elements that are evenly distributed over the circumference of the end section (110) and aligned parallel to a motor axis (96) to form a form-locking connection with the first adapter element (106). High-pressure cleaning device according to claim 3, characterized in that the form-locking elements are designed in the form of grooves (114) aligned parallel to the motor axis (96). High-pressure cleaning device according to one of the preceding claims, characterized in that the impeller (94) has a hub (98) which can be placed onto the first adapter element (106) in the axial direction to form a rotationally fixed connection and can be secured to the first adapter element (106) in the axial direction. High-pressure cleaning device according to claim 5, characterized in that the first adapter element (106) has radially outwardly directed projections (122) arranged uniformly over its circumference, which project into complementarily designed recesses (124) in the hub (98). High-pressure cleaning device according to one of the preceding claims, characterized in that the second adapter element (108) forms an adapter ring (134) which can be placed onto the motor housing (64) and which can be detachably connected to the motor housing (64).High-pressure cleaning device according to one of the preceding claims, characterized in that the blower housing (88) has a first housing part (90) and a second housing part (92) which can be detachably connected to one another, wherein the first housing part (90) can be detachably connected to the second adapter element (108). High-pressure cleaning device according to claim 8, characterized in that the second adapter element (108) has a plurality of holding pins (140, 142, 144, 146) facing the first housing part (90), onto which the first housing part (90) can be placed. High-pressure cleaning device according to claim 9, characterized in that the holding pins (140, 142, 144, 146) are hollow, wherein fastening screws which connect the first housing part (90) to the... second adapter element (108) into which retaining pins (140, 142, 144, 146) can be screwed. High-pressure cleaning device according to one of the preceding claims, characterized in that the impeller (94) is coupled to a drive shaft (164) of a fuel pump (63) via a driver (158). High-pressure cleaning device according to one of the preceding claims, characterized in that the first adapter element (106) is made of metal. High-pressure cleaning device according to one of the preceding claims, characterized in that the second adapter element (108) is made of a plastic material.

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