High-pressure cleaning machine

Abstract

The utility model relates to a high-pressure cleaning machine which comprises a machine shell, a driving system contained in the machine shell, a pump unit driven by the driving system to operate and a spraying rod system installed on the machine shell, and the spraying rod system is provided with a spraying rod connected to the pump unit, a spraying base installed on the machine shell, an extension rod connected to the spraying base and a spraying head installed on the extension rod. The extension rod comprises a first end side adjacent to the spray seat and a second end side adjacent to the spray head, the spray head is provided with a second plug on the second end side, the spray seat comprises a spray seat limiting part extending towards the extension rod from the inner wall, and when the spray head is connected to the spray seat, the second plug abuts against the spray seat limiting part, and the spray head cannot be installed on the spray seat.

Description

[Technical field]

[0001] The utility model relates to the technical field of electric tools, in particular to a high-pressure cleaning machine used for cleaning vehicles, gardens, ground and the like. [Background Technology]

[0002] High-pressure cleaners are widely used to clean vehicles, gardens, floors, etc. Their working principle is generally to drive the plunger to reciprocate through the motor assembly, form high-pressure water in the pump and spray it out through the nozzle to achieve the purpose of washing objects. High-pressure cleaners are popular among users because they are easy to carry and have high cleaning efficiency.

[0003] In a high-pressure cleaning machine with a long-rod spray device, the long-rod spray device consists of an extension rod mounted on a housing and a nozzle plugged into the extension rod. The length of the extension rod is much longer than the length of the nozzle. External water flows through the extension rod after being pressurized by a pump and is sprayed out from the nozzle. However, if the user mistakenly mounts the nozzle directly on the housing and accidentally points the nozzle at himself, when the high-pressure cleaning machine is accidentally started, the high-speed spray water flow directly aims at the user, causing great harm to the user.

[0004] In view of this, it is determined that it is necessary to provide an improved high pressure cleaning machine to overcome the defects of the prior art. [Contents of the utility model]

[0005] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a high-pressure cleaning machine with a fool-proof element, wherein the fool-proof element of the high-pressure cleaning machine can prevent the user from making erroneous operations, thereby improving the operational safety of the high-pressure cleaning machine.

[0006] The utility model solves the problems of the prior art by adopting the following technical solutions: a high-pressure cleaning machine, comprising a casing, a driving system accommodated in the casing, a pump unit driven by the driving system and a spray rod system installed on the casing, the spray rod system comprising a spray rod connected to the pump unit, a spray seat installed on the casing, an extension rod connected to the spray seat and a spray head installed on the extension rod, the extension rod comprising a first end side adjacent to the spray seat and a second end side adjacent to the spray head, the spray head is provided with a second plug at the second end side, the spray seat comprises a spray seat limiting portion extending from the inner wall toward the extension rod, when the spray head is connected to the spray seat, the second plug abuts against the spray seat limiting portion, and the spray head cannot be installed on the spray seat.

[0007] A further improvement scheme is: the spray seat is provided with a spray seat cavity formed on the inner side, the extension rod has a boss cavity provided on the first end side, an extension cavity provided on the second end side, and a flow channel tube connected between the boss cavity and the extension cavity, the spray head has a spray head cavity located at the end, the boss cavity is accommodated in the spray seat cavity, and the spray head cavity is accommodated in the extension cavity.

[0008] A further improved solution is: the extension rod is provided with a first plug between the spray rod and the inner cavity of the boss, the second plug is provided between the inner cavity of the nozzle and the flow channel tube, the first plug has a first main body, a first lug extending radially from the first main body and a first plug extension extending from the first main body toward the spray seat limiting portion, the second plug has a second main body, a second lug extending radially from the second main body and a second plug extension extending from the second main body toward the spray seat, the distance from the right end face of the first lug to the left end face of the spray seat limiting portion is smaller than the distance from the left end face of the second plug extension to the right end face of the second lug.

[0009] A further improved solution is: the extension rod has a boss inner groove that passes through the boss inner cavity and a nozzle inner groove that passes through the nozzle inner cavity, the first plug is clamped in the boss inner groove by the first lug, and the second plug is clamped in the nozzle inner groove by the second lug.

[0010] A further improved solution is: the first plug has a first plug limit portion extending from the first main body away from the first plug extension portion, the second plug has a second plug limit portion extending from the second main body away from the second plug extension portion, a first vibration damping element is provided between the first plug limit portion and the inner cavity of the boss, and a second vibration damping element is provided between the second plug limit portion and the inner cavity of the nozzle.

[0011] A further improved solution is: the spray rod passes through the first vibration-damping element and extends into the flow channel pipe.

[0012] A further improvement is as follows: a nozzle flow channel is formed inside the nozzle, and the flow channel pipe passes through the second vibration damping element and is connected to the nozzle flow channel.

[0013] A further improvement is as follows: the extension rod has an extension boss for accommodating the boss inner cavity, the nozzle has a nozzle boss for accommodating the nozzle inner cavity, the extension boss is connected to the nozzle seat via a first fixing mechanism, and the nozzle boss is connected to the extension rod via a second fixing mechanism.

[0014] A further improved solution is: the spray seat has a spray seat base that accommodates the spray seat cavity, and a positioning rod is extended from the end face of the spray seat base away from the spray seat cavity, and the positioning rod is sleeved on the spray rod.

[0015] A further improvement is as follows: the extension rod has a guide portion arranged on the first end side, and an identification portion is provided on the outer periphery of the guide portion, and the identification portion indicates the disassembly and assembly direction of the guide portion.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the nozzle is provided with a second plug on the second end side, the nozzle seat includes a nozzle seat limiting portion extending from the inner wall toward the extension rod, and when the nozzle is connected to the nozzle seat, the second plug abuts against the nozzle seat limiting portion, so that the nozzle cannot be installed on the nozzle seat, and the user operation is safer. Specifically: the distance from the first lug on the first plug to the nozzle seat limiting portion is set to be smaller than the distance from the second plug extension portion to the second lug on the second plug, so that the nozzle cannot be installed on the nozzle seat, thereby avoiding the high-speed spraying of water flow injuring the user when the nozzle is aimed at the user and the machine is accidentally started; a guide portion is provided on the outer side of the extension rod, which can reduce the shaking of the extension rod when the water flows through, and the guide portion can be used as a fulcrum for the user's hand to maintain the stability of the machine during operation; a first vibration-damping element is provided between the first plug and the inner cavity of the boss, and a second vibration-damping element is provided between the second plug and the inner cavity of the nozzle, which can effectively reduce the vibration of the nozzle seat and the extension rod, and the connection between the extension rod and the nozzle. [Drawings]

[0017] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a three-dimensional schematic diagram of the high-pressure cleaning machine of the utility model;

[0019] Figure 2 yes Figure 1 a cross-sectional view of the high pressure cleaning machine shown;

[0020] Figure 3 yes Figure 2 An exploded schematic diagram of a spray bar system in a high pressure washer shown;

[0021] Figure 4 yes Figure 2 An enlarged view of the spray bar system A in the high pressure cleaning machine shown;

[0022] Figure 5 yes Figure 3 A schematic diagram of the structure of the first plug in the spray boom system shown;

[0023] Figure 6 yes Figure 5 A schematic structural diagram of the first plug from another perspective;

[0024] Figure 7 yes Figure 2 An enlarged view of the spray bar system B in the high pressure cleaning machine shown;

[0025] Figure 8 yes Figure 3 A schematic diagram of the structure of the second plug in the spray boom system is shown.

[0026] Meaning of the reference numerals in the figures:

[0027] High pressure cleaning machine 100 housing 1

[0028] Main body 11 Input terminal 111 Output port 112 Air inlet 113 Air outlet 114 Motor mounting portion 12 Grip 13 Sole 14

[0029] Battery pack 15 Drive system 2

[0030] Motor assembly 21 Motor housing 211 Stator 212 Motor shaft 213 Rotor 214 Transmission assembly 22

[0031] Box shell 221 Speed ​​reduction mechanism 222 Pump unit 3 Pump body 31 Pressure chamber 311 Plunger 32

[0032] Pressure booster 33 Water inlet 34

[0033] Water outlet 35 Water inlet valve 36

[0034] Water circuit switch 37 First check valve 38

[0035] Second one-way valve 39 trigger system 4

[0036] Trigger 41 Pivot portion 411 Trigger lever 412 Switch 42

[0037] Switch body 421 Spring piece 422

[0038] Trigger button 423 Control system 5

[0039] Control circuit board 51 Display unit 52

[0040] Cover 6 Surface sticker 7

[0041] Boom system 8 Boom 81

[0042] Spray seat 82 Spray seat base 821

[0043] Spray seat cavity 822 Spray seat limiting portion 822a

[0044] Positioning rod 823 First fixing mechanism 824

[0045] Extension rod 83 first end side 83a

[0046] Second end side 83b Shaft 831

[0047] External thread portion 831a Extended boss 832

[0048] Boss cavity 832a Boss inner groove 832b

[0049] Extension seat 833 Extension cavity 833a

[0050] Second fixing mechanism 833b flow channel tube 834

[0051] Guide portion 84 Internal thread portion 841

[0052] Logo part 842 Nozzle 85

[0053] Nozzle boss 851 Nozzle inner cavity 851a

[0054] Nozzle inner groove 851b Nozzle flow channel 852

[0055] First plug 86 First body 861

[0056] First lug 862 First plug extension 863

[0057] First plug stopper 864 Second plug 87

[0058] Second body 871 Second lug 872

[0059] Second plug extension portion 873 Second plug limiting portion 874

[0060] First damping element 88 Second damping element 89 [Specific implementation method]

[0061] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0062] See also Figure 1 to Figure 2 An embodiment of the utility model relates to a high-pressure cleaning machine 100, which is suitable for pressurizing an external water flow and then spraying it outward to clean vehicles, courtyards, floors, etc.; the high-pressure cleaning machine 100 includes a housing 1, a driving system 2 installed in the housing 1, a pump unit 3 driven by the driving system 2, and a spray rod system 8 for spraying the external water flow sucked by the pump unit 3, and the user can start the high-pressure cleaning machine 100 through a trigger system 4 and a control system 5.

[0063] Please continue reading Figure 1 to Figure 2 The casing includes a main body 11, a motor mounting portion 12 extending from the upper end of the main body 11, a gripping portion 13 extending from the lower end of the main body 11, and a foot 14 connected to the lower end of the gripping portion 13; the main body 11 extends in the left-right direction, and is provided with a pair of air inlets 113 on the front and rear sides, the lower end of which forms an input end 111 for installing a water inlet component, and the left end of which forms an output end 112 for installing a spray bar system 8; the motor mounting portion 12 accommodates a motor component 21, and has a pair of air outlets 114 in the front-to-back direction.

[0064] The grip portion 13 is in the shape of an elongated column to facilitate user gripping and operation, and a trigger system 4 is installed at the grip portion 13; the sole 14 is used to connect to the battery pack 15, and the battery pack 15 supplies energy to the motor assembly 21; optionally, the nominal voltage of the battery pack 15 may be greater than or equal to 10V and less than or equal to 20V, for example, the nominal voltage of the battery pack 15 may be 12V, 18V, 20V, etc.; optionally, the nominal voltage of the battery pack 15 may be greater than or equal to 20V and less than or equal to 100V, for example, the nominal voltage of the battery pack 15 may be 24V, 40V, 56V, 80V, etc.

[0065] Go to Figure 2The drive system 2 is composed of a motor assembly 21 and a transmission assembly 22 arranged in the main body, and the transmission assembly 22 is connected to the lower end of the motor assembly 21; in this embodiment, the motor assembly 21 is an external rotor motor, including a motor housing 211, a stator 212 installed in the motor housing 211, a rotor 214 connected to the motor housing 211, and a motor shaft 213 fixed to the rotor 214, the transmission assembly 22 includes a box shell 221 and a reduction mechanism 222 installed in the box shell 221, and the power generated by the rotation of the rotor 214 is transmitted to the reduction mechanism 22 through the motor shaft 213.

[0066] The pump unit 3 comprises a pump body 31 and a pressure chamber 311 formed in the pump body 31 and extending left and right. The pressure chamber 311 is a place where the pump unit 3 pressurizes the external water flow. The plunger 32 extends into the pressure chamber 311 and is connected to the pressurizing mechanism 33. In the present embodiment, the pressurizing mechanism 33 is preferably a coil spring. The plunger 32 is driven by the speed reduction mechanism 222 to reciprocate in the left and right directions. The lower end and the left end of the pump body 31 are respectively provided with a water inlet end 34 and a water outlet end 35. The water inlet end 34 is exposed from the input end 111, and the water outlet end 34 is connected to the spray rod system 8. Moreover, the water inlet end 34 and the water outlet end 35 are connected to each other. The reciprocating motion of the plunger 32 can pressurize the external water flow entering from the water inlet end 34 and then spray it outward from the water outlet end 35.

[0067] The high-pressure cleaning machine 100 cannot absorb external water flow when it is stopped, and can only perform cleaning operations under the coordinated operation of the driving system 2 and the pump unit 3. Starting the driving system 2 requires the linkage operation of the triggering system 4 and the control system 5.

[0068] Please continue to refer to Figure 1 and Figure 2 The trigger system 4 includes a trigger 41 in the shape of a long rod and a switch 42 triggered by the trigger 41. In this embodiment, the switch 42 is preferably a micro switch; the trigger 41 is installed at the lower end of the main body 11 through a pivot portion 411, and the user can rotate the trigger 41 around the pivot portion 411 by pulling the trigger 41; a trigger rod 412 is provided on the side of the trigger 41 facing the grip portion 13, and the trigger rod 412 can slide on the spring piece 422 of the switch 42 while the trigger rotates, and press the trigger button 423 through the spring piece 422, so that the switch 42 can be turned on. The spring piece 422 and the trigger button 423 are both located on the switch body 421 of the switch 42.

[0069] The control system 5 includes a control circuit board 51 installed on the upper right side of the main body 11 and a display unit 52 electrically connected to the control circuit board 51. In this embodiment, the display unit 52 is preferably a display panel, and the display unit 52 is installed in the inner cavity formed on the right side of the motor mounting portion 12.

[0070] To start the high pressure cleaning machine 100, the user can first press the trigger 41 to turn on the switch 42. At this time, the switch 42 transmits the pressed signal to the control circuit board 51, the display unit 52 lights up, and the machine is in standby mode. After the display unit 52 is activated, the user can press the operation button on the surface of the display unit 52. At this time, the control circuit board 51 receives the start signal from the operation button and controls the motor assembly 21 to start; during the operation of the high pressure cleaning machine 100, the display unit will display parameters such as power and pressure in real time.

[0071] It should be noted that the prerequisite for successfully starting the high-pressure cleaning machine 100 is that the trigger 41 must be kept pressed, and the operation button does not need to be pressed continuously after being pressed once. However, if the user releases the trigger 41 during use, the machine will stop. The high-pressure cleaning machine 100 completely prevents accidental start-up of the machine through the two-step start-up of the trigger system 4 and the control system 5, ensuring the user's operating safety.

[0072] Furthermore, when the user pulls the trigger 41, the water inlet valve 36 of the pump unit 3 will be opened synchronously. Specifically, the pump unit 3 is connected to a water circuit switch 37 at the right end of the water inlet valve 36, and one end of the water circuit switch 37 away from the water inlet valve 36 abuts against the end of the trigger 41. When the trigger 41 rotates counterclockwise, the water circuit switch 37 will rotate clockwise accordingly, thereby driving the water inlet valve 36 to open to the left; further, the pump unit is provided with a first one-way valve 38 between the water inlet end 34 and the pressure chamber 311, and a second one-way valve 39 between the pressure chamber 311 and the water outlet end 35; After the user presses the operation button to start the motor assembly 21, the plunger 32 will then reciprocate. During the movement of the plunger 32 to the right, the first one-way valve 38 opens, the second one-way valve 39 closes, and the external water flows into the pressure chamber 311 through the water inlet end 34. The boosting mechanism 33 is in an energy storage state due to compression; during the movement of the plunger 32 to the left, the first one-way valve 38 closes, the second one-way valve 39 opens, and the boosting mechanism 33 is restored. The stored energy acts on the plunger 32 to pressurize the external water flow in the pressure chamber 311 to increase the force of the water sprayed out from the water outlet end 35.

[0073] The water flow sprayed from the water outlet 35 cannot be directly sprayed from the output end 112 of the high-pressure cleaning machine 100, but needs to be guided by the spray rod system 8. Figures 2 to 8 The spray rod system 8 includes a spray rod 81 connected to the water outlet 35, a spray seat 82 sleeved on the spray pipe 81 and abutting against the output end 112, and an extension rod 83 installed on the spray seat 82, wherein the extension rod 83 has a first end side 83a located at the right end and a second end side 83b located at the left end, the spray seat 82 is connected to the first end side 83a, and the left side of the second end side 83b is connected to a spray head 85.

[0074] The spray rod 81 is in the shape of an elongated tube and extends from the output end 112; the spray seat 82 has a hollow spray seat base 821, a spray seat cavity 822 formed inside the spray seat base 821, and a positioning rod 823 extending from the end face of the spray seat base 821 away from the spray seat cavity 822, and the spray seat cavity 822 has a spray seat limiting portion 822a extending to the left from the right wall, and the spray seat limiting portion 822a is hollow and connected to the positioning rod 823; when the spray seat 82 is installed to the output end 112, the positioning rod 823 is sleeved on the outer periphery of the spray rod 81 and extends into the output end 112, and the spray rod 81 passes through the spray seat limiting portion 822a.

[0075] The extension rod 83 is installed at the left end of the spray seat 82, and has a slender rod body 831. The first end side 83a is located at the right end of the rod body 831, and the second end side 83b is located at the left end of the rod body. In addition, the extension rod 83 is formed with an extension boss 832 at the first end side 83a, an extension seat 833 at the second end side 83b, and a flow channel tube 834 between the extension boss 832 and the extension seat 833. The extended boss 832 is the connecting portion between the extension rod 83 and the spray seat 82, and is quickly disassembled and assembled through the first fixing mechanism 824 on the spray seat 82; a boss inner cavity 832a is penetrated from the right end of the extended boss 832 to the left, and the wall surface of the boss inner cavity 832a abuts against the outer periphery of the spray seat limiting portion 822a; a boss inner groove 832b is penetrated through the middle wall surface of the boss inner cavity 832a, which is used to fix the first plug 86, and the first plug 86 has a first main body 861 in the form of a hollow cylinder and a pair of first lugs 862 extending radially from the first main body 861, wherein the right end portion of the first main body 861 is defined as the first plug extension portion 863 and the left end portion of the first main body 861 is defined as the first plug limiting portion 864.

[0076] Furthermore, the first plug 86 is clamped in the boss inner groove 832b by the first lug 862, and the first plug extension portion 863 and the first plug limit portion 864 are respectively abutted against the wall surface of the boss inner cavity 832a. It is worth noting that there should be a gap between the first plug extension portion 863 and the left end surface of the nozzle seat limit portion 822a, or the first plug extension portion 863 and the left end surface of the nozzle seat limit portion 822a just abut, so as to ensure that the nozzle seat limit portion 822a does not affect the extension rod 83 from being inserted into the nozzle seat. 82, the distance between the first plug extension portion 863 and the left end surface of the spray seat limiting portion 822a is defined as the first distance D; a first vibration damping element 88 is provided between the first plug limiting portion 864 and the left end surface of the boss inner cavity 832a, and the spray rod 81 passes through the first plug 86 and the first vibration damping element 88 from right to left in sequence and extends into the flow channel tube 834; the first vibration damping element 88 is arranged between the spray rod 81 and the extension rod 83, which can greatly reduce the vibration between the spray seat 82 and the extension rod 83.

[0077] Please refer to Figure 2 , Figure 7and Figure 8 As shown, the nozzle 85 is installed on the extension seat 833 at the left end of the extension rod 83. Specifically, the extension seat 833 has an extension cavity 833a formed inside, and the flow channel 834 passes through the extension seat 833 and enters the extension cavity 833a; the nozzle 85 has a nozzle boss 851 formed at the right end and a nozzle inner cavity 851a located inside the nozzle boss 851, and the nozzle boss 851 extends into the interior of the nozzle inner cavity 851a; a second fixing mechanism 833b is provided on the outer side of the extension seat 833, and the nozzle 85 can be disassembled and assembled relative to the extension seat 833 through the second fixing mechanism 833b.

[0078] The middle section of the nozzle inner cavity 851a is penetrated by a nozzle inner groove 851b, and the nozzle inner groove 851b is used to fix the second plug 87. The second plug 87 has a second body 871 in the form of a hollow cylinder and a second lug 872 radially extending from the second body 871, and a second plug extension portion 873 and a second plug stopper 874 are formed on the right and left sides of the second body 871, respectively. The second lug 872 is clamped in the nozzle inner groove 851b, and the second plug extension portion 873 does not protrude from the nozzle inner cavity 851a and does not contact the extension cavity 851a. 33a is abutted against the inner wall of the nozzle 85, and the distance from the second plug extension 873 to the second lug 872 is defined as the second distance S; further, a second vibration damping element 89 is provided between the second plug extension 873 and the left wall of the nozzle inner cavity 851a, and the flow channel tube 834 passes through the second plug 87 and the second vibration damping element 89 from right to left in sequence and extends into the nozzle flow channel 852 inside the nozzle 85; the second vibration damping element 89 is provided between the flow channel tube 834 and the nozzle inner cavity 851a, which can greatly reduce the vibration of the connection between the nozzle 85 and the extension rod 83.

[0079] In this embodiment, the first plug 88 and the second plug 89 should satisfy the following relationship after assembly, and the first distance D should be smaller than the second distance S. The relationship is now explained: in the event of a user's mistaken operation, the nozzle 85 will be directly installed on the nozzle seat 82. At this time, if the user accidentally points the nozzle 85 toward himself and the high-pressure cleaning machine 100 is accidentally started, the high-speed jet of water will injure the user; and when the first distance D is smaller than the second distance S, the user cannot directly install the nozzle 85 on the nozzle seat 82, because the second plug extension portion 873 and the nozzle seat limit portion 822a will collide and interfere during installation; therefore, the second plug 89 can be used as an anti-foolproof element to prevent the user from mistakenly installing the nozzle 85 directly on the nozzle seat 82, thereby greatly improving the operational safety of the high-pressure cleaning machine 100.

[0080] Go to Figure 1 and Figure 2A guide portion 84 is provided on one side of the extension rod 83 close to the extension boss 832, an inner wall of the guide portion 84 is provided with an internal threaded portion 841, and an external threaded portion 831a is provided on the surface of the rod body of the extension rod 83, and the guide portion 84 and the extension rod 83 can be disassembled and assembled by the cooperation between the internal threaded portion 841 and the external threaded portion 831a; and an identification portion 842 is provided on the outer surface of the guide portion 84, and the user can disassemble and assemble the guide portion 84 according to the guidance of the identification portion 842; in this embodiment, the purpose of setting the guide portion 84 is to reduce the shaking of the extension rod 83 during the operation of the high-pressure cleaning machine 100, and the user can also use the guide portion 84 as a fulcrum for the hand to maintain the stability of the machine.

[0081] In addition, in the present embodiment, a cover shell 6 is provided on the outer side of the motor mounting portion 12, and the assembly of the cover shell 6 and the motor mounting portion 12 is fastened by a surface sticker 7. If the user accidentally drops the machine while holding the high-pressure cleaning machine 100, the cover shell 6 can alleviate the impact force on the motor mounting portion 12, thereby reducing the risk of damage to the motor assembly 21.

[0082] The utility model is not limited to the above specific implementations. Those skilled in the art can easily understand that there are many alternatives to the high-pressure cleaning machine of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.

Claims

1. A high-pressure cleaning machine, comprising a housing, a driving system accommodated in the housing, a pump unit driven by the driving system, and a spray rod system installed on the housing, wherein the spray rod system comprises a spray rod connected to the pump unit, a spray seat installed on the housing, an extension rod connected to the spray seat, and a spray head installed on the extension rod; characterized in that: The extension rod includes a first end side adjacent to the spray seat and a second end side adjacent to the spray head. The spray head is provided with a second plug at the second end side. The spray seat includes a spray seat limiting portion extending from the inner wall toward the extension rod. When the spray head is connected to the spray seat, the second plug abuts against the spray seat limiting portion, and the spray head cannot be installed on the spray seat.

2. The high pressure cleaning machine according to claim 1, characterized in that: The spray seat is provided with a spray seat cavity formed on the inner side, the extension rod has a boss cavity provided on the first end side, an extension cavity provided on the second end side, and a flow channel tube connected between the boss cavity and the extension cavity, the spray head has a spray head cavity located at the end, the boss cavity is accommodated in the spray seat cavity, and the spray head cavity is accommodated in the extension cavity.

3. The high pressure cleaning machine according to claim 2, characterized in that: The extension rod is provided with a first plug between the spray rod and the inner cavity of the boss, and the second plug is provided between the inner cavity of the spray head and the flow channel tube, the first plug has a first main body, a first lug radially extending from the first main body, and a first plug extension extending from the first main body toward the spray seat limiting portion, the second plug has a second main body, a second lug radially extending from the second main body, and a second plug extension extending from the second main body toward the spray seat, the distance from the right end face of the first lug to the left end face of the spray seat limiting portion is smaller than the distance from the left end face of the second plug extension portion to the right end face of the second lug.

4. The high pressure cleaning machine according to claim 3, characterized in that: The extension rod has a boss inner groove penetrating the boss inner cavity and a nozzle inner groove penetrating the nozzle inner cavity, the first plug is clamped in the boss inner groove by the first lug, and the second plug is clamped in the nozzle inner groove by the second lug.

5. The high pressure cleaning machine according to claim 4, characterized in that: The first plug has a first plug limit portion extending from the first main body away from the first plug extension portion, the second plug has a second plug limit portion extending from the second main body away from the second plug extension portion, a first vibration damping element is provided between the first plug limit portion and the inner cavity of the boss, and a second vibration damping element is provided between the second plug limit portion and the inner cavity of the nozzle.

6. The high pressure cleaning machine according to claim 5, characterized in that: The spray bar passes through the first vibration-damping element and extends into the flow channel tube.

7. The high pressure cleaning machine according to claim 6, characterized in that: A nozzle flow channel is formed inside the nozzle, and the flow channel pipe passes through the second vibration-damping element and is communicated with the nozzle flow channel.

8. The high pressure cleaning machine according to claim 7, characterized in that: The extension rod has an extension boss for accommodating the boss inner cavity, the nozzle has a nozzle boss for accommodating the nozzle inner cavity, the extension boss is connected to the nozzle seat through a first fixing mechanism, and the nozzle boss is connected to the extension rod through a second fixing mechanism.

9. The high pressure cleaning machine according to claim 2, characterized in that: The spray seat comprises a spray seat base for accommodating the spray seat cavity, and a positioning rod is extended from the end surface of the spray seat base away from the spray seat cavity, and the positioning rod is sleeved on the spray rod.

10. The high pressure cleaning machine according to claim 1, characterized in that: The extension rod has a guide portion disposed on the first end side, and an identification portion is disposed on the outer periphery of the guide portion, and the identification portion indicates a disassembly direction of the guide portion.

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