CN114054408A - Pressure washer equipped with battery - Google Patents
Pressure washer equipped with battery Download PDFInfo
- Publication number
- CN114054408A CN114054408A CN202110837879.5A CN202110837879A CN114054408A CN 114054408 A CN114054408 A CN 114054408A CN 202110837879 A CN202110837879 A CN 202110837879A CN 114054408 A CN114054408 A CN 114054408A
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- Prior art keywords
- electric motor
- pressure
- power
- battery
- pump
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- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 21
- 238000005406 washing Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
- B08B3/026—Cleaning by making use of hand-held spray guns; Fluid preparations therefor
- B08B3/028—Spray guns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/02—Details of machines or methods for cleaning by the force of jets or sprays
- B08B2203/0223—Electric motor pumps
Abstract
The invention provides a pressure washer (1, 1'), comprising: a first pump (40) and a second pump (65), the first pump (40) and the second pump (65) being connected in parallel to each other to an inlet duct (15) of the liquid to be pressurized and to a delivery duct (20) of the pressurized liquid; a first electric motor (45) configured to actuate the first pump (40); a second electric motor (70) configured to actuate a second pump (65); and a selection device (90) configured to select the first electric motor (45) or the second electric motor (70), wherein the first electric motor (45) is connected to the power supply battery (50) through a first power line (55), and the second electric motor (70) is connected and powered by the power distribution network (E) through a second power line (75).
Description
Technical Field
The present invention relates to a pressure washer, i.e. a high-pressure washing device, for cleaning a surface by generating a liquid jet under pressure. In particular, the invention relates to a pressure washer provided with a battery and therefore suitable for use where it cannot be connected to an electrical grid.
Background
As is known, high-pressure washing devices or pressure washing machines generally comprise a motor pump comprising a pump to which an electric motor is mechanically connected for supplying the pump with the mechanical energy required for pressurizing a washing fluid (such as water) and sending it to a delivery duct.
The delivery duct is connected to a flexible tube for a pressurised liquid dispensing gun, which generally comprises an elongated body provided with a handle to which a dispensing spray gun supporting a dispensing nozzle at its free end can be associated in a removable manner.
The dispensing gun further comprises a trigger located at the handle and actuating a tap (tap) adapted to allow or stop the flow of cleaning fluid from the pump to the dispensing nozzle.
In order to be able to operate in environments that cannot be connected to the electrical grid, it is known to provide pressure washers with batteries that supply the motor of the motor pump. In order to increase the versatility of this type of motor pump, it is known to provide the motor with a dual power supply, either by means of a battery or by connection to the power grid.
A known problem with this solution is that, in order to operate the pressure washer optimally when powered by batteries, the electric motor of the motor pump is designed to have maximum power and/or maximum efficiency at a typical voltage delivered by the batteries, which is much lower than the voltage connected to the power distribution network (about 40V versus 220V). Thus, when such an electric motor is powered by mains voltage, it cannot deliver significantly more power than when powered from a battery, since the motor is optimal for a much lower supply voltage despite the voltage rise.
The object of the present invention is to solve the drawbacks of the prior art within the framework of an efficient, rational and robust construction solution.
This object is achieved by the features of the invention indicated in the independent claims. The dependent claims outline preferred and/or particularly advantageous aspects of the invention.
Disclosure of Invention
The invention particularly provides a pressure washer comprising:
a first pump and a second pump connected in parallel to each other to an inlet conduit of the liquid to be pressurized and to a delivery conduit of the pressurized liquid,
a first electric motor configured to actuate the first pump,
-a second electric motor configured to actuate a second pump, and
a selection device configured to select the first electric motor or the second electric motor,
wherein the first electric motor is connected to the power supply battery through a first power line, and the second electric motor is connected and powered by the power distribution network through a second power line.
Thanks to this solution, a pressure washer is provided which can be used in environments that cannot be connected to an electrical grid, while delivering fluid at considerable pressure and flow when connected to the electrical grid. This is because, thanks to the configuration of the electric power supply of the motors envisaged by the present invention, the first motor and the second motor may be different from each other, in particular the first motor may be optimized for low electric power supply voltages provided by the batteries, while the second motor may be optimized for electric power supply through the electric grid and therefore present a higher power, which translates into a higher pressure and/or flow rate of the fluid delivered by the pressure washer. In addition, this allows to increase the electrical efficiency of the motors compared to known pressure washers with double power supply and single motor, since each motor can be powered at a specific voltage for which it is designed, which is not the case in known devices when the single motor is supplied through the power grid.
According to one aspect of the invention, the selection means is actuatable between a first position, in which both motors are off, a second position, in which the first motor is on and the second motor is off, and a third position, in which the first motor is off and the second motor is on.
This prevents two pumps from running simultaneously, thereby avoiding hydraulic problems, since the two pumps deliver different powers due to the difference between the first and second motors.
According to another aspect of the invention, a pressure washer may include a housing, a first motor and a second motor contained within the housing, and a transformer contained within the housing and adapted to charge a battery.
This eliminates the need for the user to have to carry an external power source in order to charge the battery.
According to another aspect of the present invention, the transformer may be electrically connected to the second power supply line.
In this way, no additional electrical connections are required to charge the battery.
According to still another aspect of the present invention, the transformer charges the battery when the selection means selects the second electric motor.
This allows the battery to be automatically charged when the pressure washer is used in a configuration connected to the power grid.
The invention may also provide that the pressure washer may comprise a first pressure limiting device configured to detect the pressure in the delivery conduit and to interrupt the power supply of the first electric motor when it detects a pressure greater than a first predetermined threshold value, and a second pressure limiting device configured to detect the pressure in the delivery conduit and to interrupt the power supply of the second electric motor when it detects a pressure greater than a second predetermined threshold value, wherein the first predetermined threshold value is lower than the second predetermined threshold value.
Thanks to this feature, the service life of the battery can be extended by reducing the maximum pressure that can be delivered when the first motor is activated.
One embodiment of the present invention provides: a housing within which the first and second electric motors are at least partially contained; a housing seat of the battery, formed in the casing and configured to allow insertion and extraction of the battery from the outside of the casing itself; an electrical connector disposed in the receptacle and configured to couple with a corresponding electrical connector of the battery to form an electrical connection with the battery, wherein a first power cord connects the electrical connector with the first electric motor to power the first electric motor.
This solution enables, for example, the provision of a plurality of batteries which can be charged externally of the pressure washer, so that once one battery is depleted, the battery is always ready for use.
Drawings
Further features and advantages of the invention will become clear from reading the following description, provided by way of non-limiting example, with the aid of the figures illustrated in the attached drawings.
FIG. 1 is a schematic view of a first embodiment of a pressure washer.
FIG. 2 is a schematic view of a second embodiment of the pressure washer of FIG. 1.
Fig. 3 is a partial front view of a pressure washer according to the present invention.
FIG. 4 is a rear view of the pressure washer according to the present invention with a portion of the outer housing removed to allow viewing of a portion of the internal components.
Detailed Description
With particular reference to these figures, a pressure washer (i.e. a high-pressure washer) has been designated 1, 1'.
The pressure washer 1, 1' comprises a box-like housing 10, for example made of plastic material, with which a handle and/or wheels (not shown) are preferably associated for operating the pressure washer.
The pressure washer 1, 1' comprises a single inlet conduit 15 for the fluid to be pressurized, for example a single inlet conduit 15 for the fluid to be pressurized, which is adapted to be connected to a source of the fluid to be pressurized, for example a tank or a water network.
The inlet conduit is at least partially contained within the housing 10.
The pressure washer 1, 1' further comprises a delivery duct 20 of a pressurized fluid (for example a single delivery duct 20 of a pressurized liquid), and a dispensing gun 25, the delivery duct of the pressurized fluid being fluidly connected to the dispensing gun 25, for example by a flexible tube. For example, the delivery conduit 20 is at least partially contained within the housing 10.
The dispensing gun 25 comprises a body provided with a handle, to which, for example, a dispensing lance 30 is removably associated, the dispensing lance 30 being provided at one of its free ends with a dispensing nozzle. The dispensing gun may be associated with any other cleaning tool (such as a rotating brush) as an alternative to a spray gun.
The dispensing gun 25 may include a trigger movable between a first position in which the dispensing gun does not dispense pressurized fluid and a second position in which the dispensing gun dispenses pressurized fluid.
The pressure washer 1, 1' comprises a first hydraulic pump 40 (preferably of the fixed displacement type) connected at the inlet to the inlet conduit 15 and at the outlet to the delivery conduit 20.
The first hydraulic pump 40 is accommodated in the housing 10.
The pressure washer 1, 1' comprises a first electric motor 45 configured to actuate (only) the first pump 40 in order to pressurize the fluid coming from the inlet conduit. That is, the first electric motor 45 is provided with an outlet shaft mechanically connected with the first pump 40 to actuate the first pump 40 to pressurize the fluid from the inlet conduit.
The first electric motor 45 is accommodated in the housing 10.
The first electric motor 45 and the first pump 40 together form a first motor pump of the pressure washer.
The first electric motor 45 can only be switched on or off and, for example, when the first electric motor 45 is switched on, the first electric motor 45 actuates the first pump at a preferably single preset operating speed (rotational speed) in order to pressurize the fluid.
By way of example only, the first electric motor 45 is configured to be powered by direct current, preferably at a voltage lower than 100V (in particular comprised between 30V and 60V).
The first electric motor 45 is a direct current motor, for example one between a brushed direct current motor and a brushless motor.
As for the power supply of the first electric motor 45, the pressure washer includes a power supply battery 50, and the first electric motor 45 is connected to the power supply battery 50 through a first power supply line.
That is, the first electric motor 45 is connected and supplied with power from the power battery 50 through the first power cord 55. In particular, the first motor 45 is powered only by the power battery 50 and through the first power line 55.
The first power line 55 starts at the battery 50 and ends at the first electric motor 45.
The first power cord 55 may include one or more power cables (electrically conductive), typically a pair of power cables, each electrically connected at one end to the battery and at the other end to the first electric motor.
In the figure, the power supply line is schematically shown as a single wire, but as mentioned, the power supply line may contain more than one power cable.
The power supply battery 50 has a higher potential pole and a lower potential pole, delivering a voltage lower than 100V, preferably comprised between 30V and 60V.
The cables of the pair of cables are connected to the respective battery poles, respectively (independently of each other).
The first electric motor 45 can be actuated between a first state and a second state; in the first state, the first electric motor 45 is switched on, i.e. the first electric motor 45 is powered by the battery 50 and actuates the first pump 40, or in other words the first electric motor 45 is electrically connected to both the higher potential pole and the lower potential pole of the battery 50 and actuates the first pump 40; in the second state, the first electric motor 45 is disconnected, i.e. the first electric motor 45 is not powered by the battery and does not actuate the first pump, or in other words the first electric motor 45 is not electrically connected (i.e. disconnected) with the higher and lower potential poles of the power supply battery and no current flows in the first motor.
The pressure washer 1, 1' comprises a first pressure limiting device 60, which first pressure limiting device 60 is configured to detect a parameter indicative of the pressure in the conveying pipe and to interrupt the power supply of the first electric motor when it detects a pressure greater than a first predetermined threshold value.
In particular, the first pressure limiting device 60 comprises a sensor configured to detect a parameter indicative of the pressure present in the conveying pipe 20 and an electric switch placed along the first power line 55 to be able to interrupt the electrical continuity of the first power line 55.
The electric switch of the first pressure limiting device 60 can be actuated in a closed position and in an open position, for example directly by the sensor or by an electronic control unit operatively connected to the sensor, wherein, in the closed position, when the pressure measured by the sensor is lower than a first predetermined threshold value, the electric switch of the first pressure limiting device 60 allows an electric continuity in the first power line, i.e. without interrupting the electric continuity in the first power line; in the open position, the electrical switch of the first voltage limiting device 60 interrupts the electrical continuity in the first power line when the pressure measured by the sensor is higher than a first predetermined threshold value.
The first predetermined threshold value is for example comprised between 15 and 60 bar.
The pressure washer 1, 1' also comprises a second hydraulic pump 65 (preferably of the fixed displacement type) connected at the inlet to the inlet duct 15 and at the outlet to the delivery duct 20, connected in parallel with respect to the first pump 40.
The pressure washer 1, 1' comprises a second electric motor 70, the second electric motor 70 being configured to actuate (only actuate) the second pump 65 in order to pressurize the fluid from the inlet conduit. That is, the second electric motor 70 is provided with an outlet shaft mechanically connected with the second pump 65 to actuate the second pump 65 so as to pressurize the fluid from the inlet conduit. The second electric motor 70 and the second pump 65 together form a second motor pump of the pressure washer.
The second electric motor 70 can only be switched on or off and, for example, when the second electric motor 70 is switched on, the second electric motor 70 actuates the second pump 65 at a preferably single preset operating speed (rotational speed) in order to pressurize the fluid.
Depending on the standards adopted by the countries, the second electric motor 70 is configured, by way of example only, to be powered by being connected to the electricity distribution network E, preferably at a voltage of 100V or comprised between 120V and 127V or comprised between 220V and 240V. In particular, the present structure of the electric motor is particularly advantageous when the voltage of the power distribution network is comprised between 220V and 240V, and therefore differs greatly from the supply voltage of the battery.
The second electric motor 70 is an ac motor.
In particular, the second electric motor 70 is connected and powered (only) by the electric distribution network through a second power line 75.
For example, the second power cord 75 begins with an electrical connector and/or plug 80 (such as an electrical plug that may be coupled to an electrical socket built into the wall) and ends at the second electric motor.
The second power cord 75 may include one or more power cables (electrically conductive), typically a pair of power cables, each electrically connected at one end to an electrical connector/plug and at the other end to the second electric motor.
The electrical connector/plug 80 extends from the exterior of the housing 10.
The second supply line will typically have a higher potential pole and a lower potential pole to the connected grid and the cables of the pair of cables are connected to the respective poles (independently of each other).
The second electric motor 70 is actuatable between a first state and a second state; wherein in the first state the second electric motor 70 is switched on, i.e. in the first state the second electric motor 70 is powered by the power distribution network E and actuates the second pump 65, or in other words the second electric motor 70 is electrically connected to both the poles of higher and lower potential of the power grid E; in the second state, the second electric motor 70 is off, i.e. the second electric motor 70 is not powered by the power distribution network E and does not actuate the second pump 65, or in other words the second electric motor 70 is not electrically connected (i.e. disconnected) from the higher and lower potential poles of the power distribution network E and no current flows in the second motor.
The pressure washer 1, 1' comprises a second pressure limiting device 85, which second pressure limiting device 85 is configured to detect a parameter indicative of the pressure in the delivery conduit and to interrupt the power supply of the second electric motor when it detects a pressure greater than a second predetermined threshold value.
In particular, the second pressure limiting device 85 comprises a sensor configured to detect a parameter indicative of the pressure of the delivery conduit and an electric switch placed along the second power line 75 to be able to interrupt the electrical continuity of the second power line 75.
The electric switch of the second pressure limiting device can be actuated in the closed position and in the open position, for example directly by the sensor or by an electronic control unit operatively connected to the sensor; wherein, in the closed position, the electric switch of the second pressure limiting device allows, i.e. does not interrupt, the electric continuity in the second power line 75 when the pressure measured by the sensor is lower than a second predetermined threshold value; in the open position, the electrical switch of the second voltage limiting device interrupts the electrical continuity in the second power line when the pressure measured by the sensor is above a second predetermined threshold value.
The second predetermined threshold is for example greater than 65 bar.
The first pressure-limiting device 60 and the second pressure-limiting device 85 are different and independent of each other.
The pressure washer 1, 1' comprises a selection device 90, which selection device 90 is configured to select the first electric motor 45 or the second electric motor 70.
It should be noted that "select" means to select the switching on and off of the respective motors, i.e. it means to connect or disconnect the first electric motor 45 with respect to the power supply battery 50 and the second electric motor 70 with respect to the power supply network E.
In other words, "select" means to interrupt or not interrupt the electrical continuity of the first power line 55 and of the second power line 75, respectively, for example to allow or prevent the passage of current through the first electric motor or the second electric motor in the section of the line upstream of the respective voltage limiter (i.e. the section comprised between the battery and the first voltage limiter with respect to the first power line and between the grid and the second voltage limiter with respect to the second power line, respectively).
By interposing the selection device 90, the first electric motor 45 and the second electric motor 70 are electrically connected to the battery 50 and the electric grid E, respectively, so that the selection device 90 cuts off the first power line and the second power line.
For example, the selection device 90 includes at least one switch 95 disposed on the first power line 55 and at least one switch 100 disposed on the second power line 75, each of which is configured to selectively interrupt electrical continuity on the respective line.
Each switch is movable between a closed position in which it allows current to pass along the power supply line, i.e. it does not interrupt the electrical continuity of the power supply line, and an open position in which it interrupts the electrical continuity of the power supply line, i.e. it means prevents current from passing along the power supply line.
Preferably, the switches 95, 100 of the selection means are separate, distinct and independent from the switches of the voltage limiting means.
In the embodiment shown, the selection means 90 can be actuated in three positions, wherein in a first of the three positions the first electric motor 45 and the second electric motor 70 are both off, i.e. disconnected from the power supply battery 50 and the power grid E, respectively, in a second of the three positions only the second electric motor 70 is on and the first electric motor 45 is off, i.e. wherein the second electric motor 70 is connected and powered by the power grid and the first electric motor is disconnected from the power supply battery, and in a third of the three positions the first electric motor 45 is on and the second electric motor 70 is off, i.e. wherein the first electric motor is connected and powered by the power supply battery and the second electric motor is disconnected from the power supply network.
In detail, in the first position, both the switch 95 on the first power line and the switch 100 on the second power line are in the open position; in the second position, the switch 95 on the first power line is in the open position and the switch 100 on the second power line is in the closed position; in the third position, the switch 95 on the first power line is in a closed position and the switch 100 on the second power line is in an open position.
For example, the first selection means can only be actuated in said three positions.
Preferably, the selection means are of the manual type.
It should be noted that "manual type" means that it can be activated manually, preferably only by an operator.
For example, the selection means 90 comprise, i.e. consist of, a single switching device containing the switches 95, 100 on the above-mentioned power cord, configured to be selectively positioned in the above-mentioned three positions, and a selection body which can be directly touched/grasped by the user, for example a knob 105, for selecting a position for example hooked to the casing 10, for example, in particular in such a way as to make it possible to access the selection body from the outside of the casing itself.
The selector device comprises an electrical selector (not shown), e.g. moved by a selector body, which is configured such that it opens and/or closes a switch of the selection means when actuated.
It is not excluded that, in an alternative embodiment not shown, the selection means may comprise a microprocessor configured to selectively switch the motor on and off, and a control interface configured to actuate the microprocessor.
Furthermore, it is not excluded that in an alternative embodiment not shown, the switches 95, 100 placed on the power cord can be controlled independently and separately from each other by two corresponding, mutually independent manual controls (for example two lever switches or two rocker switches or two bistable buttons located on the casing 10).
The pressure washer 1 may comprise a transformer 110, which transformer 110 is accommodated in the housing 10 and adapted to allow charging of the battery 50.
Specifically, a transformer is defined as an electrical device configured to convert alternating current to direct current by varying a voltage difference of input alternating current relative to output alternating current. Furthermore, the transformer comprises or is associated with an electronic circuit adapted to monitor the charge percentage of the battery and to interrupt the charging when the charge percentage is at its maximum.
The pressure washer conforms to the way that the battery 50 is charged by the transformer 110 when the second motor 70 is selected, i.e., when the second motor 70 is powered.
In particular, the pressure washer is configured such that the transformer automatically charges the battery 50 when the selection device 90 is in the third position, i.e. the transformer is automatically connected and powered by the input current from the grid E when the selection device is in the third position. Connection to the grid may be via a second power line 75. However, it is not excluded that in embodiments not shown, such a connection may be made via an additional power supply line.
The transformer 110 is preferably electrically connected to the second power line 75, the transformer 110 receiving an input current from the second power line 75. In particular, the transformer 110 is electrically connected to the second power line, for example in an intermediate position between the selection device 90 and the second electric motor 70, or in an intermediate position between the selection device 90 and the second voltage limiting device 85, so as to be interposed between the second power line 75 and the battery 50.
In a configuration in which the transformer is connected to the second power supply line at a position comprised between the selection means 90 and the second electric motor 70, and the selection means is in the third position, current simultaneously reaches the second electric motor 70 and the transformer 110 through the second power supply line, thereby charging the power supply battery 50 when the second electric motor is in use.
Another configuration (not shown) allowing automatic charging of the battery when the selection means are in the third position provides that the transformer is connected to the grid through a third power line connected to the second power line at a point comprised between the connector/plug and the selection means, or that the transformer is connected to the grid through a power line independent of the first and second power lines and allowing connection to the grid. In this case, the selection means comprise a switch placed on the third power supply line and actuatable between an open position, in which it interrupts the electrical continuity of the third power supply line, and a closed position, in which it allows the flow of current in the third power supply line, and between said positions according to the switch placed on the second power supply line of the selection means.
In a first embodiment of the pressure washer, shown in fig. 1 and indicated with 1, a battery 50 is housed (in a non-removable manner, except during maintenance operations involving the disassembly of the casing) inside the casing 10.
In this case, the cable of the first power supply line 55 directly connects one higher potential pole and one lower potential pole of the battery 50 to the first electric motor 45.
Furthermore, in such an embodiment, the pressure washer 1 comprises a transformer 110, the transformer 110 being preferably (in a non-removable manner except during maintenance operations involving the disassembly of the casing) housed in the casing 10 and connected to the second power line 75 in the portion comprised between the selection means 90 and the second electric motor 70 (i.e. in the portion comprised between the selection means 90 and the second voltage limiting means 85).
In a second embodiment of the pressure washer, shown in fig. 2 and designated 1 ', the power supply battery 50 is removably associated with the housing 10, and preferably the pressure washer 1' does not include a transformer housed within the housing.
In this case, the power supply battery 50 can be charged using a transformer external to the pressure washer and independently of the connection to the power grid of the pressure washer.
Then, the pressure washer 1' comprises a housing seat 115 for the power battery, the housing seat 115 being formed in the casing and configured to allow the insertion and extraction of the battery from the outside of the casing itself.
In such an embodiment, the pressure washer 1' includes an electrical connector 120, the electrical connector 120 being disposed in the receptacle and configured to couple to a corresponding electrical connector 125 mounted on the battery 50 to form an electrical connection between the battery and the first power cord 55.
In the present embodiment, by way of example only, the first power cord 55 connects the electrical connector 120 disposed in the receptacle 115 with the first electric motor 45 to supply power to the first electric motor.
In detail, the cable of the first power line starts from the electrical connector 120 provided in the housing seat 115 and ends at the first electric motor.
The operation of the present invention is as follows.
When the user is in a location where it is not possible to connect to the electric grid, the user can operate the pressure washer by selecting the first electric motor, i.e. by actuating the knob of the selection means in the second position, in which the power battery 50 is electrically connected to the first electric motor 45 and supplies power to the first electric motor 45.
In this case, the first electric motor 45 actuates the first pump 40, increasing the pressure of the liquid in the delivery conduit. When a first predetermined pressure threshold is reached in the duct, the first pressure-limiting device interrupts the electrical continuity of the first power line, thus disconnecting the first electric motor. This situation typically occurs when the user does not require dispensing of fluid through the gun. Once the user requests the fluid to be dispensed, the pressure in the delivery duct drops below a first predetermined threshold, and then the first pressure-limiting device reestablishes the electrical continuity of the first power line, so that the connection of the first electric motor to the battery is restored.
On the other hand, if the user is in a location where connection to the power distribution network is possible, such as by plugging the plug/connector of the pressure washer into a corresponding electrical outlet, the user may select the second electric motor 70 to dispense pressurized fluid at a higher pressure/flow rate than when the first electric motor is powered.
To do this, the user need only act on the knob of the selection means and move it to the third position.
In this case, the second electric motor 70 actuates the second pump 65, thereby increasing the pressure of the liquid in the delivery conduit. When a first predetermined pressure threshold is reached in the pipe, the first voltage limiting means interrupt the electrical continuity of the first power line, which does not cause any problem, since the first power line has been interrupted by the selection means. When a second predetermined pressure threshold is reached, the second pressure-limiting device interrupts the electrical continuity of the second power line, thus disconnecting the second electric motor. Once the user requests the fluid to be dispensed, the pressure in the delivery conduit drops below a second predetermined threshold, the second pressure limiting device reestablishes the electrical continuity of the second power line, so that the connection of the second electric motor to the electric network is restored.
During use in the third position, in the embodiment shown in fig. 1, when the selection means is in the third position, the transformer is electrically connected to the second power line, thereby allowing the battery to be charged.
In the case of the embodiment shown in fig. 2, the battery must be charged by taking it out and charging it by means of a transformer external to the pressure washer. This configuration provides the convenience of being able to use the pressure washer for long periods of time if the user has more than one battery powered by the battery.
The invention thus conceived is susceptible of numerous modifications and variations, all of which fall within the scope of the inventive concept.
Moreover, all the details may be replaced with other technically equivalent elements.
In practice, the materials used, as well as the contingent shapes and dimensions, may be any according to requirements without thereby departing from the scope of protection of the appended claims.
Claims (7)
1. A pressure washer (1, 1'), comprising:
-a first pump (40) and a second pump (65), said first pump (40) and said second pump (65) being connected in parallel to each other to an inlet duct (15) of the liquid to be pressurized and to a delivery duct (20) of the pressurized liquid,
a first electric motor (45) configured to actuate the first pump (40),
-a second electric motor (70) configured to actuate the second pump (65), and
-a selection device (90) configured to select the first electric motor (45) or the second electric motor (70),
wherein the first electric motor (45) is connected to a power supply battery (50) by a first power line (55), and the second electric motor (70) is connected and powered by a power distribution network (E) by a second power line (75).
2. Pressure washer (1, 1') according to claim 1, characterized in that the selection device (90) is actuatable between a first position, in which both the first electric motor (45) and the second electric motor (70) are switched off, a second position, in which the first electric motor (45) is switched on and the second electric motor (70) is switched off, and a third position, in which the first electric motor (45) is switched off and the second electric motor (70) is switched on.
3. Pressure washer (1) according to any of the preceding claims, characterized by comprising: a housing (10) within which the first electric motor (45) and the second electric motor (70) are housed; and a transformer (110) accommodated within the housing (10) and adapted to charge the power supply battery (50).
4. A pressure washer (1) as claimed in claim 3, characterized in that the transformer (110) is electrically connected to the second power supply line (75).
5. Pressure washer (1) according to claim 3 or 4, characterized in that the transformer (110) charges the power battery (50) when the selection device (90) selects the second electric motor (70).
6. Pressure washer (1') according to claim 1, characterized by comprising: a housing (10) within which the first electric motor (45) and the second electric motor (70) are at least partially contained; a housing seat (115) of the power supply battery, formed in the casing (10) and configured to allow the insertion and extraction of the power supply battery from the outside of the casing itself; -an electrical connector (120) provided in the housing seat and configured to couple with a corresponding electrical connector (125) of the power battery to form an electrical connection with the power battery (50), wherein the first power line (55) connects the electrical connector (120) with the first electric motor (45) to power the first electric motor itself.
7. Pressure washer (1, 1') according to claim 1, characterized in that it comprises: a first pressure limiting device (60), said first pressure limiting device (60) being configured to detect a pressure in the conveying pipe (20) and to interrupt the power supply of the first electric motor (45) when a pressure greater than a first predetermined threshold is detected; and a second pressure limiting device (85), the second pressure limiting device (85) being configured to detect a pressure in the conveying pipe (20) and to interrupt the supply of electric power to the second electric motor (70) when a pressure greater than a second predetermined threshold is detected, wherein the first predetermined threshold is lower than the second predetermined threshold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT202000018445 | 2020-07-29 | ||
| IT102020000018445 | 2020-07-29 |
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| CN114054408A true CN114054408A (en) | 2022-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110837879.5A Pending CN114054408A (en) | 2020-07-29 | 2021-07-23 | Pressure washer equipped with battery |
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| Country | Link |
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| EP (1) | EP3944905A1 (en) |
| CN (1) | CN114054408A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3944905A1 (en) * | 2020-07-29 | 2022-02-02 | Annovi Reverberi S.p.A. | Pressure washer provided with an electric battery |
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| EP3944905A1 (en) | 2022-02-02 |
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