CN106914439B

CN106914439B - Pressure cleaning machine

Info

Publication number: CN106914439B
Application number: CN201611235767.8A
Authority: CN
Inventors: 乔勇; 吴平华; 孙云红; 牟国良; 张士松
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2015-12-28
Filing date: 2016-12-28
Publication date: 2021-01-05
Anticipated expiration: 2036-12-28
Also published as: CN106914439A

Abstract

The invention relates to a pressure washer and a spray rod identification method thereof, wherein the pressure washer comprises: the machine shell comprises a pump for conveying water flow outwards and a motor for driving the pump to work; the spray rod is provided with a trigger piece; and the control part is used for identifying the spray rod connected to the shell and carrying out on-off control or controlling the shell to convey water flow with corresponding pressure outwards based on the identification result. The pressure washer can be provided with the spray rods of different types so as to increase the application range and flexibility of the pressure washer without replacing a shell. And, still can carry out on-off control according to the discernment result, avoid the casing to start under the condition of not installing the spray lance.

Description

Pressure cleaning machine

Technical Field

The invention relates to the field of high-pressure cleaning, in particular to a pressure cleaning machine and a spray rod identification method of the pressure cleaning machine.

Background

The cleaning machine can generate high-pressure water flow to wash the surface of an object, can strip and wash away dirt, achieves the aim of cleaning the surface of the object and is widely applied to various fields of life. Compared with the traditional manual cleaning, the cleaning machine reduces the water consumption, saves the time of an operator and has better cleaning effect.

The length and the shape of the gun body of the cleaning machine are different, and the required output working conditions of the main machine are different. Therefore, the cleaning machine with the gun bodies of different lengths appears in the market, and the user can replace the gun bodies of different lengths according to different use environments so as to meet the output working condition. At present, when the gun bodies with different lengths are replaced by the pressure cleaning machines on the market, the output working conditions of the pressure cleaning machines are required to be adjusted by users, and inconvenience is brought to the users.

Disclosure of Invention

Therefore, it is necessary to provide a pressure washer applicable to different environments and a spray bar identification method of the pressure washer for the pressure washer to change different spray bars and require a user to adjust the output working condition of the pressure washer.

A pressure washer, comprising: the water pump comprises a machine shell, a water pump and a motor, wherein the machine shell comprises a pump for conveying water flow outwards and the motor for driving the pump to work; the water flow is sprayed out through the spray rod; and the control component is arranged in the shell and used for identifying the type of the spray rod and controlling the pump to outwards deliver water flow with corresponding pressure according to the type of the spray rod.

According to the pressure washer, the control part can identify different spray rods to change the pressure of the output water flow, so that the pressure of the output water flow is adaptive to the type of the spray rods, and the application range and flexibility of the pressure washer are increased.

In one embodiment, the control component comprises an identification module and a rotating speed control module, wherein the identification module is used for identifying the type of the spray rod and sending a signal to the rotating speed control module according to the identification result; the rotating speed control module controls the rotating speed of the motor according to the identification result, so that the output water pressure of the pump corresponds to the type of the spray rod.

In one embodiment, a trigger is optionally provided on the spray bar, and the identification module identifies the trigger to identify the type of spray bar.

In one embodiment, the trigger is a magnet or an induction coil, and the identification module is a hall detection element for detecting the magnetic field strength of the magnet or the induction coil.

In one embodiment, the trigger comprises a plunger, and the identification module comprises a contact member, wherein when the spray bar is mounted on the housing, the plunger can contact the contact member to trigger the identification module to send a signal.

In one embodiment, the spray rod comprises a high-pressure spray rod and a low-pressure spray rod which can be alternatively arranged on the shell, the length of the high-pressure spray rod is longer than that of the low-pressure spray rod, a first high-pressure trigger is arranged on the high-pressure spray rod, a trigger is not arranged on the low-pressure spray rod, the identification module can identify the first high-pressure trigger and send a corresponding first signal to the rotating speed control module, and the rotating speed control module adjusts the rotating speed of the motor according to the first signal so that the pump outputs first output water pressure; the identification module sends a corresponding second signal to the rotating speed control module when the trigger is not identified, and the rotating speed control module adjusts the rotating speed of the motor according to the second signal so that the pump outputs a second output water pressure, wherein the first output water pressure is greater than the second output water pressure.

In one embodiment, the information of the spray bar comprises the length of the spray bar, the spray bar comprises a high-pressure spray bar and a low-pressure spray bar which can be alternatively installed on the casing, the length of the high-pressure spray bar is greater than that of the low-pressure spray bar, a first high-pressure trigger is arranged on the high-pressure spray bar, a first low-pressure trigger is arranged on the low-pressure spray bar, the identification module can identify the first high-pressure trigger and send a corresponding first signal to the rotating speed control module, and the rotating speed control module adjusts the rotating speed of the motor according to the first signal so that the pump outputs first output water pressure; the identification module can also identify that the first low-pressure trigger sends a corresponding second signal to the rotating speed control module, and the rotating speed control module adjusts the rotating speed of the motor according to the second signal so that the pump outputs a second output water pressure, wherein the first output water pressure is greater than the second output water pressure.

In one embodiment, the spray bar is telescopic, and the spray bar is in a stretching state and corresponds to a high-pressure spray bar, and the spray bar is in a compressing state and corresponds to a low-pressure spray bar.

In one embodiment, the telescopic spray rod comprises a first spray pipe and a second spray pipe, wherein the inner diameter of the first spray pipe is larger than the outer diameter of the second spray pipe, and the second spray pipe is telescopically sleeved in the first spray pipe.

In one embodiment, when the identification module does not identify the trigger, the rotating speed control module controls the pump to be in a closed state, and the output water pressure of the pump is zero.

In one embodiment, the casing further comprises a control switch electrically connected to one end of the motor to control the operating state of the motor.

In one embodiment, the casing further includes a switch unit connected between the rotation speed control module and the motor, the identification module sends a power-on prohibition signal to the rotation speed control module when the identification module does not identify the trigger, the rotation speed control module controls the switch unit to power off the motor according to the power-on prohibition signal, and the control switch cannot turn on the pressure washer.

In one embodiment, the switch unit includes a field effect transistor, and the rotation speed control module controls on/off of the field effect transistor according to the power-on prohibition signal.

In one embodiment, the switching unit further includes a driving module connected between the field effect transistor and the rotation speed control module, and the control module turns on or off the field effect transistor through the driving module.

In one embodiment, the housing is configured as a pistol grip.

The invention also provides a spray rod identification method of the pressure washer, which comprises the following steps: identifying a spray rod; sending a corresponding signal according to the identification result; and receiving the signal, and controlling the water flow with corresponding pressure to be delivered outwards according to the signal.

In one embodiment, the method for identifying a spray bar of a pressure washer further comprises the steps of: when the spray bar is not identified, a power-on prohibition signal indicating that the spray bar is not identified is transmitted.

The present invention also provides a pressure washer, comprising: the water pump comprises a machine shell, a water pump and a motor, wherein the machine shell comprises a pump for conveying water flow outwards and the motor for driving the pump to work; an interface accessory mounted to the housing; a control part disposed within the housing, the control part being capable of recognizing different interface accessories and changing a pressure of the outwardly outputted water flow based on a recognition result.

In one embodiment, the interface attachment is provided with a trigger.

In one embodiment, the control component comprises an identification module and a rotating speed control module, wherein the identification module is used for identifying the trigger piece and sending a signal to the rotating speed control module according to an identification result; the rotating speed control module is used for controlling the pump to convey water flow with corresponding pressure outwards according to the signal.

In one embodiment, the trigger comprises a push rod, the identification module comprises a contact piece, and the push rod can be contacted with the contact piece to trigger the identification module to send a signal when the interface accessory is installed on the shell.

In one embodiment, the interface accessory comprises a high-pressure interface accessory and a low-pressure interface accessory which can be alternatively installed on the shell, the length of the high-pressure interface accessory is greater than that of the low-pressure interface accessory, a first high-pressure trigger is arranged on the high-pressure interface accessory, a first low-pressure trigger is arranged on the low-pressure interface accessory, the identification module can identify the first high-pressure trigger and send a corresponding first signal to the rotating speed control module, and the rotating speed control module adjusts the pump to output a first output water pressure according to the first signal; the identification module can also identify that the first low-pressure trigger piece sends a corresponding second signal to the rotating speed control module, and the rotating speed control module adjusts the pump to output a second output water pressure according to the second signal, wherein the first output water pressure is greater than the second output water pressure.

In one embodiment, the rotation speed control module adjusts the rotation speed of the motor according to the signal sent by the identification module so as to adjust the output water pressure of the pump.

In one embodiment, the interface attachment is removably mounted to the housing.

In one embodiment, the identification module is configured to identify the trigger to identify the interface accessory, and send the corresponding signal to the rotational speed control module according to information of the interface accessory to correspondingly control the pump; when the identification module does not identify the interface accessory, the rotating speed control module controls the pump to be in a closed state, and the output water pressure of the pump is zero; when the identification module identifies the interface accessory, the rotating speed control module controls the output water pressure of the pump to correspond to the information of the interface accessory.

In one embodiment, the casing further includes a switch unit connected between the rotation speed control module and the motor, the identification module sends a power-on prohibition signal to the rotation speed control module when the identification module does not identify the trigger, the rotation speed control module controls the switch unit to power off the motor according to the power-on prohibition signal, and the control switch cannot turn on the main cabinet.

Drawings

FIG. 1 is a schematic diagram of a pressure washer according to one embodiment;

FIG. 2 is a block diagram of the pressure washer shown in FIG. 1;

FIG. 3 is a front view of another embodiment of a pressure washer;

FIG. 4 is a corresponding cross-sectional view of the pressure washer shown in FIG. 3;

FIG. 5 is a flow diagram of a spray bar identification method of a pressure washer according to one embodiment;

FIG. 6 is a schematic view of another embodiment of a pressure washer.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, a pressure washer 100 of the preferred embodiment includes a housing 120, a control unit 130, and an interface attachment 200 detachably mounted to the housing 120. The interface attachment 200 may also be referred to as a spray bar.

Specifically, the housing 120 includes a pump for delivering water flow to the outside and a motor 122 for driving the pump to operate. The interface attachment 200 is optionally provided with a trigger, and the control unit 130 is configured to recognize the trigger to recognize the interface attachment 200 connected to the housing 120, and perform on/off control based on the recognition result, or control the housing 120 to supply water flow corresponding to the pressure to the outside.

In the pressure washer 100, the control unit 130 can recognize different interface attachments 200 according to the triggers on the different interface attachments 200, so that the washer 100 can automatically recognize the types of the interface attachments 200 to change the pressure of the output water flow, and thus different types of interface attachments 200 can be installed to increase the applicability and flexibility of the pressure washer 100 without replacing the housing 120. And, can also carry on the on-off control according to the recognition result, avoid the chassis 120 to start up under the condition of not installing the interface attachment 200.

Referring to fig. 1 and 2, the pressure washer 100 further includes a water tank 110 and a connecting pipe 140, wherein the water tank 110 is used for storing water and is connected to the housing 120, and the motor 122 in the housing 120 is operated by driving the pump, so that the housing 120 delivers water outwards. The interface attachment 200 is connected to the outlet of the housing 120 through the connection pipe 140, and the water in the water tank 110 flows out of the interface attachment 200 through the connection pipe 140 by the driving of the motor 122 in the housing 120. The control unit 130 may recognize the above-described interface accessory 200 and control the housing 120 to supply water of a corresponding pressure, such as high-pressure water or low-pressure water, to the outside based on the recognition result.

In other embodiments, the pressure washer 100 may omit the water tank 110 and directly interface the inlet of the housing 120 with the outlet of a water source (e.g., tap water), depending on the actual application. The connecting pipe 140 can be omitted according to the requirement of the use environment, and the casing 120 is directly butted with the interface attachment 200, so as to control the pressure cleaning machine 100 to output high-pressure water flow or low-pressure water flow.

In other embodiments, the housing 120 of the pressure washer 100 may take on other configurations. Fig. 3 and 4 disclose a hand-held pressure washer 100. In this embodiment, the housing 120 is configured as a pistol type, with the motor 122, pump and control unit 130 all disposed within the body of the housing 120.

Specifically, the control component 130 includes an identification module 132 and a rotation speed control module 134, the identification module 132 is configured to identify the trigger, and send a signal to the rotation speed control module 134 according to the identification result, and the rotation speed control module 134 performs on/off control according to the signal, or controls the housing 120 to deliver water flow with corresponding pressure to the outside.

In this embodiment, the identification module 132 is used for identifying the trigger to identify the interface attachment 200, and sending a corresponding signal to the rotational speed control module 134 according to the information of the interface attachment 200 to control the pump accordingly. When the identification module 132 does not identify the interface attachment 200, the rpm control module 134 controls the pump to be in an off state and the output water pressure of the pump is zero. When the identification module 132 identifies the interface attachment 200, the rpm control module 134 controls the pump to output a water pressure level corresponding to the information of the interface attachment 200.

Further, the pressure washer 100 includes two or more interface attachments 200, the two or more interface attachments 200 are respectively provided with a trigger, and the identification module 132 can identify the triggers of different interface attachments 200 and send corresponding signals to the rotation speed control module 30 according to the triggers.

Specifically, the interface accessory 200 includes a high-pressure interface accessory 210 and a low-pressure interface accessory 220 that are alternatively mountable on the housing 120. Generally, in order to meet the safety requirements in the industry, the high-pressure interface accessory 210 corresponds to a long-type nozzle structure, the low-pressure interface accessory 220 corresponds to a short-type nozzle structure, and the length of the high-pressure interface accessory 210 is greater than that of the low-pressure interface accessory 220. The high-voltage interface accessory 210 is provided with a first high-voltage trigger (not shown), and the low-voltage interface accessory 220 is provided with a first low-voltage trigger (not shown). The identification module 132 can identify the first high-pressure trigger and send a corresponding first signal to the rotation speed control module 134, the rotation speed control module 134 adjusts the housing 120 to output a first output water pressure according to the first signal, and controls the motor 122 to keep running at a high speed, so that the pressure washer 100 delivers a high-pressure water flow to the outside. The identification module 132 may further identify that the first low-pressure trigger sends a corresponding second signal to the rotation speed control module 134, and the rotation speed control module 134 adjusts the pump of the housing 120 to output a second output water pressure according to the second signal, so as to control the motor 122 to keep running at a low speed, so as to enable the pressure washer 100 to deliver a low-pressure water flow to the outside. In this manner, the first output water pressure is greater than the second output water pressure, thereby satisfying the different needs of the high pressure port fitting 210 and the low pressure port fitting 220.

More specifically, when the identification module 132 detects the first high-pressure trigger, a first signal is sent to the rotation speed control module 134, and the rotation speed control module 134 may start the motor 122 and control the rotation speed of the motor 122 according to the first signal, so that the output water pressure of the pump is larger. When the identification module 132 detects the first low-pressure trigger, a second signal is sent to the rotation speed control module 134, and the rotation speed control module 134 may start the motor 122 according to the second signal and control the rotation speed of the motor 122, so that the output water pressure of the pump is small.

Thus, when the user needs to convey the high-pressure water flow to the outside of the pressure washer 100, the user connects the corresponding high-pressure interface attachment 210 with the long nozzle structure to the water outlet of the pressure washer 100, so that the first high-pressure trigger of the high-pressure interface attachment 210 contacts with the identification module 132, and the identification module 132 controls the motor 122 to keep rotating at a high speed based on the identification result, so that the pressure washer 100 conveys the high-pressure water flow to the outside. When the user needs to send low-pressure water flow to the outside of the pressure washer 100, the user replaces the low-pressure interface accessory 220 with the high-pressure interface accessory 210, the identification module 132 identifies the connected spray bar as the low-pressure interface accessory 220, and controls the motor 122 to keep rotating at a low speed based on the identification result, so that the pressure washer 100 sends the low-pressure water flow to the outside.

In another embodiment, the control component 130 includes a first identification module (not shown) and a second identification module (not shown). When the high-pressure interface accessory 210 is connected to the water outlet of the casing 120, the first high-pressure trigger of the high-pressure interface accessory 210 contacts with the corresponding first identification module, and the first identification module identifies that the connected spray rod is the high-pressure interface accessory 210, so that the motor 122 is controlled to keep rotating at a high speed, and the pressure washer 100 is enabled to convey high-pressure water flow outwards; when the low-pressure interface accessory 220 is connected to the water outlet of the housing 120, the first low-pressure trigger of the low-pressure interface accessory 220 contacts with the second identification module, and the second identification module identifies that the connected spray bar is the low-pressure interface accessory 220, so that the motor 122 is controlled to rotate at a low speed, and the pressure washer 100 is enabled to convey low-pressure water outwards.

Therefore, when the user needs the pressure washer 100 to convey high-pressure water flow outwards, the user connects the corresponding high-pressure interface accessory 210 with the long nozzle structure to the water outlet of the pressure washer 100, so that the first high-pressure trigger piece of the high-pressure interface accessory 210 is in contact with the first identification module, at this time, the access accessory identified by the first identification module is the high-pressure interface accessory 210, the second identification module is in an idle state, and the first identification module controls the motor 122 to keep rotating at a high speed based on the identification result, so that the pressure washer 100 conveys the high-pressure water flow outwards. When the user needs to convey the low-pressure water flow outwards by the pressure washer 100, the user replaces the low-pressure interface accessory 220 with the high-pressure interface accessory 210, the first identification module is in an idle state, the first low-pressure trigger of the low-pressure interface accessory 220 is in contact with the corresponding second identification module, at this time, the second identification module identifies the connected spray rod as the low-pressure interface accessory 220, and controls the motor 122 to keep rotating at a low speed based on the identification result, so that the pressure washer 100 conveys the low-pressure water flow outwards. In this way, the pressure washer 100 can meet the user's requirements for the outward delivery of the high pressure water stream from the pressure washer 100, as well as meet the safety regulations in the industry regarding the pressure washer 100.

In another embodiment, the interface accessory 200 may also include a multi-pressure accessory having a low-pressure state with a shorter interface and a high-pressure state with a longer interface, and having a second high-pressure trigger and a second low-pressure trigger corresponding to the above states. When the pressure washer 100 needs to work at low pressure, the spray rod is switched to be in a low-pressure state with a short interface, the second low-pressure trigger part is in contact with the identification module 132, the identification module 132 identifies that the connected multi-pressure accessory is in a low-pressure state, and the motor 122 is controlled to rotate at a low speed based on the identification result, so that the pressure washer 100 conveys low-pressure water outwards. When the high-pressure operation of the press 100 is required, the interface attachment 200 is switched to a high-pressure state with a longer interface. The second high-pressure trigger is contacted with the identification module 132, and the multi-pressure accessory connected to the identification module 132 is in a high-pressure state, and the motor 122 is controlled to keep rotating at a high speed based on the identification result, so that the pressure washer 100 conveys high-pressure water outwards.

More specifically, the pressure washer 100 is provided with a frequency converter, and the frequency converter is connected to the rotation speed control module 134, and the rotation speed control module 134 can change the power frequency by controlling the frequency converter, so as to change the rotation speed of the driving motor 122. It is understood that the method for changing the rotation speed of the driving motor 122 is not limited thereto, and may be set according to actual needs.

The housing 120 is further provided with a control switch 124, and an operator can control the operating condition of the housing 120 through the control switch 124. Specifically, the control switch 124 is electrically connected to one end of the motor 122 to control the operating state of the motor 122. When the control switch 124 is closed by an operator, the motor 122 is powered on to operate, and when the control switch 124 is opened by the operator, the motor 122 is powered off to stop operating. As such, an operator may operate the control switch 124 to control the operating conditions of the pressure washer 100.

In this embodiment, the housing 120 further includes a switch unit 126, the switch unit 126 is connected between the rotation speed control module 134 and the motor 122, and the rotation speed control module 134 controls the switch unit 126 to cooperate with the control switch 124 to control the operating condition of the motor 122. When the identification module 132 does not identify the trigger, it sends a power-on prohibition signal to the rotation speed control module 134, and the rotation speed control module 134 turns off the switch unit 126 according to the power-on prohibition signal, so that the motor 122 is powered off and cannot be turned on, thereby preventing the casing 120 from being started due to misoperation when the casing 120 is not connected with the interface accessory 200. When the identification module 132 identifies the trigger, it sends a signal to the speed control module 134, and the speed control module 134 controls the switch unit 126 to be turned on, so that the motor 122 can control the switch 124 to drive the pump to operate.

Specifically, the switching unit 126 includes a field effect transistor 1262. In this embodiment, the field effect transistor 1262 is a Metal Oxide Semiconductor (MOS) transistor. The rotation speed control module 134 controls the on-off of the MOS tube according to the signal and the start-up prohibition signal. When the speed control module 134 receives the signal, a certain voltage is output to turn on the MOS transistor, so that the motor 122 can be turned on. At this time, the control switch 124 is closed, so that the motor 122 is in an operating state. When the rotation speed control module 134 receives the start-up prohibition signal, the MOS transistor is turned off, so that the motor 122 is powered off and cannot operate. At this time, even if the control switch 124 is closed, the motor 122 is still in the power-off state.

The switch unit 126 further includes a driving module 1264 connected between the MOS transistor and the rotation speed control module 134, and the rotation speed control module 134 switches off or switches on the MOS transistor through the driving module 1264 to increase the switching speed of the MOS transistor, so as to increase the response speed of the motor 122, and make the operation of the pressure washer 100 faster and more convenient.

In this embodiment, the triggering member is a magnet or an induction coil, and the identification module 132 is a hall detection element. Specifically, the hall sensing element may be configured to sense a magnetic field strength of the magnet or the induction coil, generate a corresponding voltage value according to the magnetic field strength, and send the voltage value as a signal to the rotation speed control module 134. The speed control module 134 adjusts the operating conditions of the housing 120 based on the obtained signal. As such, the magnetic field strength of the first trigger on the high voltage interface accessory 210 is different from the magnetic field strength of the second trigger on the low voltage interface accessory 220, thereby causing the identification module 132 to generate a different voltage value.

Alternatively, the trigger is provided on the high voltage interface accessory 210 and not on the low voltage interface accessory 220, such that the identification module 132 generates a different voltage value. When the low voltage interface accessory 220 is connected to the housing 120, the voltage value identified by the identification module 132 is zero because there is no trigger; when the high voltage interface accessory 210 is connected to the housing 120, the identification module 132 senses the trigger and generates a corresponding non-zero voltage value due to the presence of the trigger. As shown in FIG. 4 for the hand-held pressure washer 100, the identification module 132 is disposed within the connection end 1202 of the housing 120 to the spray bar. The trigger 160 is disposed in the end 2102 of the high voltage interface accessory 210 connected to the connection end 1202, and the trigger 160 is a magnet or an inductor. The end 2202 of the low-voltage interface accessory 220 that connects to the connection end 1202 does not have the trigger 160 located therein. In another embodiment, the trigger comprises a push rod and the identification module 132 comprises a contact member. When the interface accessory 200 is mounted on the housing 120, the pushrod extends into the interior of the housing 120 and the end of the pushrod can contact a contact within the housing 120 to trigger the identification module 132 to send a signal. The top rod end of the high-pressure interface accessory 210 and the low-pressure interface accessory 220 have different structures, so that the identification module 132 sends corresponding signals, and the rotating speed control module 134 controls the shell 120 to output different working conditions according to the signals.

Further, the pressure washer 100 further includes a relief valve 150, and the relief valve 150 further includes an adjustment element for adjusting a relief pressure of the relief valve 150 based on the identification result of the identification module 132. When the pressure washer 100 outputs the corresponding high-pressure water flow or the low-pressure water flow, the adjustment element controls the relief valve 150 so that the pressure washer 100 does not exceed the maximum pressure setting value corresponding to the high-pressure water flow or the low-pressure water flow. For example, when the pressure washer 100 is outputting a low-pressure water flow, the regulating element controls the relief valve 150 to make the pressure washer 100 output a low-pressure water flow not exceeding 2.2 Mpa; when the pressure washer 100 is outputting high-pressure water flow, the adjusting element controls the overflow valve 150 to make the high-pressure water flow output by the pressure washer 100 not exceed 4.2 Mpa.

Further, the high-pressure interface accessory 210 is in contact with the identification module 132 through the first high-pressure trigger, and the identification module 132 sends a signal for maintaining high-speed rotation to the motor 122 through the rotation speed control module 134 based on the identification result, and meanwhile, the adjusting element of the relief valve 150 receives the corresponding signal. At this time, the regulating element controls the relief valve 150, and changes the relief valve 150 to a maximum pressure setting value corresponding to the high-pressure water flow so that the water flow pressure output by the pressure washer 100 does not exceed a high-pressure set pressure value, for example, 4.2Mpa, and then, when the relief valve 150 detects that the water flow pressure output by the pressure washer 100 exceeds 4.2Mpa, the relief valve 150 relieves the excess water flow pressure of the pressure washer 100 so that the water flow pressure output by the pressure washer 100 is always kept below 4.2 Mpa. On the other hand, when the low pressure interface accessory 220 contacts the identification module 132 through the first low pressure trigger, the identification module 132 sends a signal to maintain low speed rotation to the motor 122 through the speed control module 134 based on the identification result, and meanwhile, the regulating element of the relief valve 150 also receives the corresponding signal. At this time, the regulating element controls the relief valve 150, and changes the relief valve 150 to a maximum pressure setting value corresponding to the low-pressure water flow so that the water flow pressure output from the pressure washer 100 does not exceed the pressure value set at the low pressure, for example, 2.2Mpa, and then, when the relief valve 150 detects that the water flow pressure output from the pressure washer 100 exceeds 2.2Mpa, the relief valve 150 relieves the excess water flow pressure of the pressure washer 100 so that the water flow pressure output from the pressure washer 100 is always kept at 2.2Mpa or less.

It is understood that the relief valve 150 may be disposed on the casing 120, or between the interface fitting 200 and the outlet of the casing 120, and the invention is not limited thereto.

In the pressure washer 100, the housing 120 can be installed and recognize different interface accessories 200, and water flows with different pressures can be output according to the different interface accessories 200, so that the pressure washer can be matched with the different interface accessories 200, different use requirements can be met, and the application range of the pressure washer 100 can be expanded. The operator need only replace the interface attachment 200 for different use environments, rather than replacing the entire pressure washer 100. Also, when the housing 120 is not connected to the interface accessory 200, the housing 120 is in the power-on disabled state, thereby preventing the housing 120 from operating when the interface accessory 200 is not connected.

As shown in fig. 5, the method for identifying the spray bar of the pressure washer 100 of the preferred embodiment includes the following steps:

s110: the interface accessory 200 is identified.

S120: and sending a corresponding signal according to the identification result.

S130: and receiving the signal, and performing on-off control or outwards delivering water flow with corresponding pressure according to the signal.

According to the spray rod identification method of the pressure washer 100, whether the shell 120 is connected with the interface accessory 200 or not can be judged through detecting the trigger, different interface accessories 200 can be identified, and therefore the working condition of the pressure washer 100 is controlled according to whether the interface accessory 200 is connected or not and different models of the interface accessory 200, so that the pressure washer can be matched with different interface accessories 200, and different use requirements can be met.

The spray bar identification method of the pressure washer 100 further includes the steps of:

s140: when the interface accessory 200 is not recognized, a power-on disable signal indicating that the trigger is not recognized is transmitted.

Specifically, as shown in fig. 2 and 3, when the control unit 130 does not recognize the trigger, the corresponding power-on disable signal is sent to disable the power of the motor 122 in the housing 120, so as to prevent the housing 120 from operating when the interface accessory 200 is not connected.

In the present embodiment, the length of the interface fitting 200 is positively correlated to the output water pressure generated by the housing 120 according to the signal. The longer the length of the interface attachment 200, the greater the output water pressure to meet the cleaning needs of the pressure washer 100.

In this manner, the control unit 130 may send different signals to the speed control module 132 according to spray bars of different lengths, thereby creating different operating conditions to meet the requirements of different interface attachments 200. Moreover, the power-on prohibition signal may be sent to the rotation speed control module 134 when the trigger is not identified, so as to prevent the case 120 from being opened without connecting the interface accessory 200.

According to the spray rod identification method of the pressure cleaning machine 100, the corresponding signal can be output by detecting the trigger piece, so that the working condition of the pressure cleaning machine 100 is controlled, different interface accessories 200 can be installed on the shell 120 of one pressure cleaning machine 100 alternatively, the pressure cleaning machine 100 can automatically identify the interface accessories 200 and output water flow with corresponding pressure, and the requirements of different use environments are met without replacing the whole pressure cleaning machine. Moreover, the case 120 can be prevented from being turned on without connecting the interface accessory 200, which results in waste of electric energy and potential safety hazard.

Fig. 6 discloses another hand-held pressure washer 100. In this embodiment, the high pressure interface attachment 210 and the low pressure interface attachment 220 are comprised of telescoping booms. When the telescopic boom is in a stretched state, the pressure washer 100 is equivalently connected with the high-pressure interface accessory 210; when the telescoping boom is in a compressed state, the pressure washer 100 is equivalent to connecting the low pressure interface attachment 220. Specifically, as shown in fig. 6(a) and 6(b), the telescopic spray bar includes a first spray pipe 211 and a second spray pipe 213. The inner diameter of the first nozzle 211 is larger than or equal to the outer diameter of the second nozzle 213, and the second nozzle 213 is movably sleeved with the first nozzle 211. As shown in fig. 6(a), the second nozzle 213 telescopically extends out of the first nozzle 211 to form the high-pressure interface attachment 210. As shown in fig. 6(b), second nozzle 213 is telescopically retracted into first nozzle 211 to form a low pressure interface fitting 220.

Preferably, in this embodiment, the housing 120 is provided with the identification module 132 at the connection with the interface accessory, the first nozzle 211 is provided with the trigger 160 at the connection with the second nozzle 213, and the second nozzle 213 is not provided with the trigger. When the second nozzle 213 is retracted into the first nozzle 211, the recognition module 132 senses the trigger 160 to generate a recognition signal, and the rotation speed control module 134 controls the rotation speed range of the motor in the low pressure state according to the recognition signal. When the second nozzle 213 is in a state of extending out of the first nozzle 211, the distance between the trigger 160 and the identification module 132 is too long, the identification module 132 cannot sense the trigger 160, the rotation speed control module 134 cannot receive the identification signal, and the rotation speed control module 134 controls the motor to be in a preset rotation speed range in a high-pressure state.

In this embodiment, the high pressure interface attachment 210 and the low pressure interface attachment 220 are formed from two-piece telescoping spray bars. In other embodiments, the high pressure interface attachment 210 and the low pressure interface attachment 220 may be formed from more than two sections of telescoping spray bars. In this embodiment, the retractable spray bar may be removably mounted to the housing 120 or may be integrally formed directly with the housing 120.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pressure washer, comprising:

the water pump comprises a shell, a water pump body and a water pump body, wherein the shell comprises a pump for conveying water flow outwards and a motor for driving the pump to work;

the water flow is sprayed out through the spray rod, and the spray rod is detachably mounted on the machine shell;

the control component is arranged in the shell and used for identifying the type of the spray rod and controlling the pump to outwards deliver water flow with corresponding pressure according to the type of the spray rod;

the control component comprises an identification module and a rotating speed control module, wherein the identification module is used for identifying the type of the spray rod and sending a signal to the rotating speed control module according to an identification result; the rotating speed control module controls the rotating speed of the motor according to the identification result, so that the output water pressure of the pump corresponds to the type of the spray rod;

the spray rod is provided with a trigger, and the identification module identifies the trigger so as to identify the type of the spray rod;

the information of the spray rod comprises the length of the spray rod, the spray rod comprises a high-pressure spray rod and a low-pressure spray rod which can be alternatively arranged on the shell, the length of the high-pressure spray rod is longer than that of the low-pressure spray rod, a first high-pressure trigger is arranged on the high-pressure spray rod, a first low-pressure trigger is arranged on the low-pressure spray rod, the identification module can identify the first high-pressure trigger and send a corresponding first signal to the rotating speed control module, and the rotating speed control module adjusts the rotating speed of the motor according to the first signal so that the pump outputs first output water pressure; the identification module can also identify that the first low-pressure trigger sends a corresponding second signal to the rotating speed control module, and the rotating speed control module adjusts the rotating speed of the motor according to the second signal so that the pump outputs a second output water pressure, wherein the first output water pressure is greater than the second output water pressure;

the pressure washer further comprises an overflow valve, and the overflow valve comprises an adjusting element for adjusting the overflow pressure of the overflow valve based on the identification result of the identification module.

2. The pressure washer of claim 1, wherein the trigger is a magnet or an induction coil, and the identification module is a hall sensing element for sensing the magnetic field strength of the magnet or the induction coil.

3. The pressure washer of claim 1, wherein the trigger comprises a plunger and the identification module comprises a contact member, the plunger being contactable with the contact member to trigger the identification module to send a signal when the spray bar is mounted to the housing.

4. The pressure washer of claim 1, wherein the speed control module controls the pump to be in a closed state when the identification module does not identify the trigger, and the output water pressure of the pump is zero.

5. The pressure washer of claim 1, wherein the housing further comprises a control switch electrically connected to one end of the motor to control the operating state of the motor.

6. The pressure washer according to claim 5, wherein the housing further comprises a switch unit connected between the rotation speed control module and the motor, the identification module sends a power-on prohibition signal to the rotation speed control module when the trigger is not identified, the rotation speed control module controls the switch unit to power off the motor according to the power-on prohibition signal, and the control switch fails to turn on the pressure washer.

7. The pressure washer according to claim 6, wherein the switch unit comprises a field effect transistor, and the rotation speed control module controls the on/off of the field effect transistor according to the power-on prohibition signal.

8. The pressure washer of claim 7, wherein the switch unit further comprises a driving module connected between the field effect transistor and the rotation speed control module, and the rotation speed control module turns on or off the field effect transistor through the driving module.