High-pressure cleaning device
Patent Information
- Application Number
- EP2023789936
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-26
- Filing Date
- 2023-10-12
- Publication Date
- 2025-09-03
AI Technical Summary
High-pressure cleaning devices experience mechanical and thermal stress on electrical cables connecting the electric motor and control device, leading to potential damage and inefficiency.
Surrounding the electrical cables with an elastically deformable protective hose, which has pluggable end sections that connect to hose connection parts on the motor and control device, reducing mechanical and thermal stress while providing splash protection.
The solution effectively reduces mechanical and thermal loads on cables, simplifies assembly, and protects against splash water, enhancing the durability and performance of the high-pressure cleaning device.
Smart Images
Figure 1.1
Abstract
Description
[0001] HIGH-PRESSURE CLEANING DEVICE
[0002] The invention relates to a high-pressure cleaning device with a motor pump unit having a pump for pressurizing a cleaning fluid and an electric motor for driving the pump, and with an electrical control device for controlling the electric motor, wherein the control device is arranged above the motor pump unit at a distance therefrom and is connected to the motor via at least one electrical cable.
[0003] With the help of such high-pressure cleaning devices, a cleaning fluid, preferably water, can be pressurized, which can then be directed at an object to be cleaned.
[0004] The cleaning fluid is pressurized by a pump driven by an electric motor. The electric motor is controlled by a control device, which can be used to switch the electric motor on and off. In particular, it can be provided that the control device can also be used to select an operating mode of the electric motor. The control device is connected to the motor via at least one electrical cable and is arranged above the motor-pump unit at a distance from the motor-pump unit. Providing a distance between the motor and the control device makes it possible to keep the thermal load on the control device caused by the waste heat from the motor to a minimum. Such a high-pressure cleaning device is known, for example, from WO 2012 / 119640 A2.
[0005] The at least one electrical cable connecting the electric motor to the control device is subject to thermal and mechanical stress in the area between the electric motor and the control device. It is desirable to reduce this stress.
[0006] The object of the present invention is therefore to further develop a high-pressure cleaning device of the type mentioned at the outset in such a way that the mechanical and thermal load on the at least one cable in the area between the electric motor and the control device can be reduced in a structurally simple and assembly-friendly manner.
[0007] This object is achieved according to the invention in a high-pressure cleaning device of the generic type in that the at least one cable is surrounded in the area between the electric motor and the control device by an elastically deformable protective hose which has a first end section assigned to the electric motor and a second end section assigned to the control device, wherein the first end section can be plugged into a first hose connection part arranged on the electric motor, and wherein the second end section can be plugged into a second hose connection part arranged on the control device, and wherein the at least one cable can be guided through the protective hose and the two hose connection parts.
[0008] In the high-pressure cleaning device according to the invention, the at least one electrical cable via which the control device is in electrical connection with the electric motor is surrounded by a protective hose at least in the area between the electric motor and the control device.
[0009] This allows the mechanical and thermal stress on the at least one cable to be reduced. Furthermore, the at least one cable can be protected from splash water by means of the protective hose. The protective hose is designed to be elastically deformable and has a first end section assigned to the electric motor and a second end section assigned to the control device. The first end section can be plugged into a first hose connection part arranged on the electric motor, and the second end section can be plugged into a second hose connection part arranged on the control device. The at least one cable can be guided through the protective hose and the two hose connection parts.The pluggable connection of the end sections of the protective hose to the hose connection parts located on the electric motor and the control device enables very simple assembly of the protective hose. It is not necessary to design the end sections in any special way, for example, in the form of connecting flanges or bushings. Rather, the protective hose can be cut to a suitable length from a hose supply and then plugged into the hose connection parts without additional post-processing. The elastic deformability of the protective hose allows the protective hose to be deformed while maintaining its inner diameter to such an extent that it can be inserted into or plugged onto the hose connection parts, even if the hose connection parts are not exactly aligned with each other.The mechanical and thermal stress on the at least one cable in the area between the electric motor and the control unit can thus be reduced in a structurally simple and easy-to-install manner. Furthermore, the at least one cable can be protected from splash water by means of the protective hose in the area between the electric motor and the control unit.
[0010] In a preferred embodiment of the invention, the protective hose is designed as a corrugated hose. This allows for a particularly simple, dimensionally stable change of direction of the protective hose in the area between the electric motor and the control device.
[0011] The corrugated hose can, for example, be made of a plastic material, in particular a polyethylene or polypropylene material.
[0012] Alternatively, the protective hose can be designed as a corrugated metal hose. Using a corrugated metal hose, not only can the mechanical and thermal stress on the at least one cable in the area between the electric motor and the control device be reduced, but the at least one cable can also be protected from electromagnetic interference, such as overvoltages.
[0013] In a particularly preferred embodiment of the invention, the longitudinal axes of the hose connection parts have directional components aligned parallel to one another, and a stop element is arranged on each hose connection part, against which an end face of the protective hose can be placed, wherein the protective hose can be clamped between the two stop elements. For example, it can be provided that the first hose connection part is aligned vertically in a horizontal position of use of the high-pressure cleaning device and that the second hose connection part is inclined to the vertical, wherein the angle of inclination is less than 90°, for example, a maximum of 45°.The parallel directional components of the longitudinal axes of the two hose connection parts make it possible to clamp the elastically deformable protective hose between the two stop elements, whereby it can be compressed in the longitudinal direction and, due to its inherent tension, can be fixed to the hose connection parts in a particularly simple manner.
[0014] It is advantageous if the protective hose can be locked to the first hose connector and / or the second hose connector. This further simplifies the installation of the protective hose.
[0015] When the protective hose is designed in the form of a corrugated hose, it is advantageous if the first hose connection part and / or the second hose connection part have at least one locking projection that is adapted to the corrugated shape of the protective hose. This makes it easier to lock the protective hose to the hose connection part.
[0016] It is advantageous if at least one of the two hose connection parts is surrounded over a partial area of its circumference by at least one hose guide part arranged at a distance from the hose connection part and has at least one locking projection on its outer side in the area of its circumference not surrounded by the at least one hose guide part, wherein the protective hose can be plugged onto the hose connection part and can be locked to the hose connection part by means of the at least one locking projection.Such a design facilitates the assembly of the protective hose on the hose connection part and enables a mechanically very resilient plug-in connection between the protective hose and the hose connection part, since the end section of the protective hose assigned to the hose connection part can be plugged onto the hose connection part and locked thereto, wherein the at least one hose guide part can guide the end section when plugged onto the hose connection part and can come into contact with the outside of the end section when the end section is in the locked state, so that it can support the end section on the outside.In addition, such a design enables simple production of the hose connection part and the hose guide part in a casting process, since the hose connection part can be demolded in the axial direction in the area surrounded by the at least one hose guide part and in the radial direction in the area of the at least one locking projection.
[0017] Preferably, at least one of the two hose connection parts is sleeve-shaped.
[0018] In an advantageous embodiment of the invention, the high-pressure cleaning device comprises a hose connection device that forms the first hose connection part and can be detachably connected to a motor housing of the electric motor with the interposition of a sealing element. For example, it can be provided that the hose connection device can be screwed to the motor housing. The provision of the hose connection device that forms the first hose connection part makes it possible to use standard motors without their motor housings having to be specially designed to establish a pluggable connection with the protective hose. As is customary, the motor housings of standard motors have a through-opening through which the at least one cable can be passed.The hose connection device forming the first hose connection part can be connected to the through-opening with the interposition of a sealing element, for example a sealing ring, and the protective hose can then be pushed onto or inserted into the first hose connection part.
[0019] It is advantageous if the control device has a control housing for receiving at least one control element, wherein the second hose connection part is formed onto the control housing.
[0020] In particular, it can be provided that the control housing has a lower housing part and an upper housing part, wherein the second hose connection part is formed on a bottom wall of the lower housing part.
[0021] The following description of a preferred embodiment of the invention serves to explain it in more detail in conjunction with the drawings. They show:
[0022] Figure 1: a perspective view of a high-pressure cleaning device;
[0023] Figure 2: a plan view of the high-pressure cleaning device from Figure 1;
[0024] Figure 3: a partial sectional view of the high-pressure cleaning device along the
[0025] Line 3-3 in Figure 2;
[0026] Figure 4: an enlarged view of detail X from Figure 3;
[0027] Figure 5: a sectional view of the high-pressure cleaning device taken along line 5-5 in Figure 4, with electrical cables hidden;
[0028] Figure 6: A perspective view of a hose connection device of the high-pressure cleaning device. 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. In the illustrated embodiment, the high-pressure cleaning device 10 is designed to be movable and has a fuel-powered continuous-flow heater 12. However, the invention is not limited to such high-pressure cleaning devices, but also encompasses high-pressure cleaning devices that do not have a fuel-powered continuous-flow heater and are not necessarily movable.
[0029] In the illustrated embodiment, the high-pressure cleaning device 10 has two wheels 14, 16 and a castor 18, which are rotatably mounted on a chassis 20. A main direction of movement of the high-pressure cleaning device 10 is illustrated in Figures 1, 2, and 3 by the arrow 22.
[0030] The chassis 20 is formed by a base plate 24, which is bolted to a support frame 26. The support frame 26 forms a front frame section 28 relative to the main direction of movement 22, which is U-shaped and oriented substantially vertically relative to the horizontal operating position of the high-pressure cleaning device 10 shown in the drawing.
[0031] Adjoining the front frame section 28 are two longitudinal frame sections 30, 32, spaced apart from one another and aligned parallel to the main direction of movement 22, which are each rigidly connected to a leg 38 or 40 of a U-shaped rear frame section 42 via a connecting section 34, 36. The legs 38, 40 are essentially vertically aligned and rigidly connected to one another via a web 44 aligned perpendicular to the main direction of movement 22. Adjoining the rear frame section 42, opposite the main direction of movement 22, is a handle bar 46 having two bar legs 48, 50 that are screwed to the rear frame section 42 and rigidly connected to one another via a bar web 52.
[0032] The instantaneous water heater 12 is arranged behind the rear frame section 42, relative to the main movement direction 22, between the bracket legs 48, 50 of the handle bar 46. This is particularly evident in Figure 3.
[0033] A motor pump unit 54 is positioned on a bracket 56 in front of the rear frame section 42 in the main direction of movement 22. The motor pump unit 54 has an electric motor 58 that drives a pump 60 and a fan 62. A cleaning fluid, preferably water, can be pressurized by means of the pump 60, and combustion air can be supplied to the flow heater 12 by means of the fan 62.
[0034] A fuel tank 64 is arranged between the motor pump unit 54 and the front frame section 28. The fuel tank 64 serves to store liquid fuel, in particular heating oil or diesel fuel, for operating the instantaneous water heater 12.
[0035] The fuel tank 64 can be inserted into the space between the motor pump unit 54 and the front frame section 28 in an assembly direction oriented perpendicular to the main movement direction 22 and can be removed from the space, for example, for servicing purposes.
[0036] Extending between the two legs 38, 40 of the rear frame section 42 is a holding part 68 that is integrally connected to the legs 38, 40. Starting from the holding part 68, a plate-shaped support part 70 extends to an upper side 72 of the fuel tank 64. The support part 70 is arranged above the electric motor 58 and at a distance from it and is screwed to the holding part 68 and to the fuel tank 64. An electrical control device 74 is positioned on the support part 70. The control device 74 has a control housing 76 with a lower housing part 78 and an upper housing part 80. The control housing 76 accommodates control elements 90 that are electrically connected to the electric motor 58 via cables 92. This is clearly shown in Figures 3 and 4. In Figure 5, the cables have been hidden to provide a better overview.
[0037] A ceiling wall 94 of the upper housing part 80 forms a control panel 96 on which a control element 98 in the form of a rotary knob is arranged.
[0038] A bottom wall 95 of the lower housing part 78 forms a support surface with which the control housing 76 is supported on the support part 70.
[0039] A hood 100 of the high-pressure cleaning device 10 covers the control device 74, wherein the hood 100 has an opening 102 through which the control panel 96 and in particular the control element 98 are accessible to the user.
[0040] As already mentioned, the control device 74 is electrically connected to the electric motor 58 via several cables 92. In the area between the electric motor 58 and the control housing 76, the cables 92 are surrounded by an elastically deformable protective hose in the form of a corrugated hose 104. The corrugated hose 104 has a first end section 106 assigned to the electric motor 58 and a second end section 108 assigned to the control device 74.
[0041] As is particularly clear from Figures 4 and 5, the first end section 106 can be plugged into a first hose connection part 110, which is arranged on the electric motor 58. The first hose connection part 110 is formed by a hose connection device 112. The hose connection device 112 is screwed to a motor housing 116 of the electric motor 58 with the interposition of a sealing ring 114, wherein the first hose connection part 110 is aligned with a through-opening 117 of the motor housing 116. The cables 92 can be led out of the motor housing 116 via the through-opening 117.
[0042] The first hose connection part 110 is designed in the form of a first connection sleeve 118 and is surrounded by two diametrically opposed hose guide parts 120, 122, which are arranged at a distance from the hose connection part 110 and each extend circumferentially over a portion of the hose connection part 110. The two hose guide parts 120, 122 each form a sleeve segment 124 and 126, respectively.
[0043] In the peripheral areas not surrounded by the hose guide parts 120, 122, the hose connection part 110 has two locking projections 128, 130 and 132, 134 arranged axially offset from one another on its outer side. This is particularly evident in Figures 5 and 6.
[0044] The end of the first hose connection part 110 facing the through opening 117 of the motor housing 116 is surrounded by an annular first stop element 136 which extends radially to the hose guide parts 120, 122.
[0045] The first end section 106 of the corrugated hose 104 can be plugged onto the sleeve-shaped first hose connection part 110 to form a snap-in connection between the first end section 106 and the first hose connection part 110, wherein the end face of the first end section 106 comes to rest on the first stop element 136.
[0046] The second end section 108 of the corrugated hose 104 can be plugged into a second hose connection part 138 arranged on the control device 74. The second hose connection part 138 is designed in the form of a second connection sleeve 140, which is molded onto the bottom wall 95 of the lower housing part 78 of the control housing 76. The second end section 108 can be inserted into the second hose connection part 138 until its end face comes into contact with a second stop element 142. The second stop element 142 is arranged on the end of the second hose connection part 138 projecting into the control housing 76 and is designed as a radially inwardly directed collar 143.
[0047] The first hose connection part 110 is oriented vertically in the horizontal operating position of the high-pressure cleaning device 10. The second hose connection part 138 is inclined at an angle of approximately 20° to the vertical in the horizontal operating position of the high-pressure cleaning device 10. The longitudinal axes 144, 146 of the two hose connection parts 110, 138 thus have vertical directional components aligned parallel to one another. This allows the corrugated hose 104 to be clamped between the two stop elements 136, 142, whereby the elastically deformable corrugated hose 104 is compressed in the longitudinal direction of the hose and, due to its inherent tension, is secured to the hose connection parts 110, 138 in a particularly simple manner.
[0048] With the help of the corrugated hose 104, the mechanical and thermal stress on the cables 92 in the area between the electric motor 58 and the control device 74 is significantly reduced. Furthermore, the corrugated hose 104 provides splash protection for the cables 92 in the area between the electric motor 58 and the control device 74. The corrugated hose 104 can be plugged into the two hose connection parts 110, 138 in a very easy-to-assemble manner and clamped between the stop elements 136, 138. Due to its inherent tension, the elastically deformable corrugated hose 104 can be easily secured to the two hose connection parts 110, 138. It is not necessary to design the end sections 106, 108, for example, in the form of connecting flanges or bushings.The corrugated hose 104 only needs to be cut to the required length from a continuous material and can then be plugged onto the first hose connection part 110 during assembly of the high-pressure cleaning device 10, forming a snap-in connection, and inserted into the second hose connection part 138, wherein the corrugated hose 104 surrounds the electrical cables 92, which are guided through the corrugated hose 104 and the two hose connection parts 110, 138.
Claims
PATENT CLAIMS High-pressure cleaning device with a motor pump unit (54) which has a pump (60) for pressurizing a cleaning fluid and an electric motor (58) for driving the pump (60), and with an electrical control device (74) for controlling the electric motor (58), wherein the control device (74) is arranged above the motor pump unit (54) at a distance therefrom and is connected to the electric motor (58) via at least one electrical cable (92), characterized in that the at least one cable (92) is surrounded in the region between the electric motor (58) and the control device (74) by an elastically deformable protective hose which has a first end section (106) assigned to the electric motor (58) and a second end section (108) assigned to the control device (74), wherein the first end section (106) is pluggably connectable to a first hose connection part (110) arranged on the electric motor (58),and wherein the second end section (108) is pluggably connectable to a second hose connection part (138) arranged on the control device (74), and wherein the at least one cable is passable through the protective hose and the two hose connection parts (110, 138). High-pressure cleaning device according to claim 1, characterized in that the protective hose is designed as a corrugated hose. High-pressure cleaning device according to claim 1 or 2, characterized in that the protective hose is designed as a metal corrugated hose (104). High-pressure cleaning device according to one of the preceding claims, characterized in that the longitudinal axes (144, 146) of the two hose connection parts (110, 138) are aligned parallel to one another, Have directional components, and a stop element (136, 142) is arranged on each of the hose connection parts (110, 138), against which an end face of the protective hose can be placed, wherein the protective hose can be clamped between the two stop elements (136, 142). High-pressure cleaning device according to one of the preceding claims, characterized in that the protective hose can be locked to the first hose connection part (110) and / or to the second hose connection part (122).High-pressure cleaning device according to claim 5, characterized in that at least one of the two hose connection parts (110) is surrounded over a partial area of its circumference by at least one hose guide part (120, 122) arranged at a distance from the hose connection part (110) and has at least one locking projection (128, 130; 132, 134) on its outer side in the area of its circumference not surrounded by the hose guide part (120, 138), wherein the protective hose can be plugged onto the hose connection part (110) and can be locked to the hose connection part (110) by means of the at least one locking projection (128, 130; 132, 134). High-pressure cleaning device according to one of the preceding claims, characterized in that at least one of the two hose connection parts (110, 138) is sleeve-shaped.High-pressure cleaning device according to one of the preceding claims, characterized in that the high-pressure cleaning device (10) has a hose connection device (112) which forms the first hose connection part (110) and can be detachably connected to a motor housing (116) of the electric motor (58) with the interposition of a sealing element (114). High-pressure cleaning device according to one of the preceding claims, characterized in that the control device (74) has a control housing (76) for receiving at least one control element (90), wherein the second hose connection part (138) is integrally formed on the control housing (76). High-pressure cleaning device according to claim 9, characterized in that the control housing (76) has a lower housing part (78) and an upper housing part (80), wherein the second hose connection part (138) is integrally formed on a bottom wall (95) of the lower housing part (78).