CN112746944A - Diaphragm pump and high-pressure cleaning machine - Google Patents

Abstract

The invention relates to a diaphragm pump and a high-pressure cleaning machine, which comprise a pump body, a diaphragm arranged on the side of the pump body, a cover body covering the diaphragm and forming a pressure chamber with the diaphragm, and a driving mechanism arranged in the pump body, wherein the diaphragm is provided with a dynamic area which deforms to change the volume of the pressure chamber, the diaphragm pump also comprises a top head mechanism driven by the driving mechanism, the top head mechanism is provided with a contact surface which contacts with the dynamic area to deform the dynamic area, and the projection of the contact surface on the diaphragm along the moving direction of the top head mechanism always covers the dynamic area. The projection area of the contact surface of the ejector mechanism along the axis of the ejector mechanism is larger than or equal to the projection area of the dynamic region along the axis direction of the ejector mechanism, so that the ejector mechanism always bears the pressure of the dynamic region in a comprehensive and auxiliary manner, the hardness of the diaphragm is indirectly improved, the volumetric efficiency of the pressure chamber is improved, and the pressure relief problem is avoided.

Description

Diaphragm pump and high-pressure cleaning machine

Technical Field

The invention relates to a diaphragm pump and a high-pressure cleaning machine, and belongs to the technical field of diaphragm pumps.

Background

The diaphragm pump is also called a control pump, and the elasticity of a diaphragm in the diaphragm pump is utilized, and the reciprocating deformation of the diaphragm is utilized to enable a pressure chamber formed by the diaphragm and a cover body to generate volume change, so that liquid is pressed in and sucked out. In the existing diaphragm pump, the general area of a supporting plane of a device which is used for contacting with a diaphragm and enabling the diaphragm to deform is too small, so that the deformation of the diaphragm is smaller, the volume change of a pressure chamber is smaller, and finally the problems of small water outlet pressure and difficult pressure lifting of the diaphragm pump are caused; meanwhile, the problem that the pressure relief is easily caused and the pressurizing force cannot be borne due to small diaphragm supporting area is solved.

Disclosure of Invention

The invention aims to provide a diaphragm pump and a high-pressure cleaning machine which can assist a diaphragm to resist the pressure in a pressure chamber so as to avoid pressure relief and improve the water pressure.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a diaphragm pump, includes the pump body, sets up diaphragm, the lid in the pump body side is established on the diaphragm and with the diaphragm forms pressure chamber's lid and sets up actuating mechanism in the pump body, the diaphragm has the dynamic region of deformation in order to change pressure chamber's volume size, the diaphragm pump still include by actuating mechanism driven top mechanism, top mechanism have with the contact surface of dynamic region contact so that it takes place deformation, the contact surface is followed the projection of the direction of motion of top mechanism on the diaphragm covers all the time dynamic region.

Further, the contact surface and/or the surface of the diaphragm facing the plug mechanism is a smooth surface or an uneven surface.

Furthermore, grooves or bulges which are regularly or dispersedly arranged are arranged on the contact surface and/or the surface of the membrane facing the plug mechanism; or the contact surface and/or the surface of the diaphragm facing the plug mechanism are/is a wave-shaped plane.

Further, the contact surface is an arc-shaped surface protruding outwards towards the dynamic region.

Furthermore, the diaphragm pump further comprises a protruding block which is located on the contact surface and protrudes outwards, a concave groove matched with the protruding block is formed in the diaphragm, and the protruding block is matched with the concave groove to enable the ejector mechanism to drive the dynamic area of the diaphragm to move towards one side, away from the pressure chamber, of the diaphragm.

Further, the driving mechanism is made of a first material, and the plug mechanism is made of a second material, and the hardness of the second material is greater than that of the first material.

Further, actuating mechanism is including being reciprocating motion's shaft coupling, top mechanism with the shaft coupling is close to the one end of pressure chamber and links to each other and by the shaft coupling drives the motion, the shaft coupling with top mechanism integrated into one piece perhaps the shaft coupling with top mechanism components of a whole that can function independently sets up.

Furthermore, the diaphragm further comprises a static area which is positioned on one side of the dynamic area and is statically arranged, and a surrounding part which surrounds the dynamic area and the static area, wherein the surrounding part is fixed between the pump body and the cover body.

The invention also provides a high-pressure cleaning machine which comprises a body, a fluid input end arranged on the body, a fluid output end used for jetting the fluid outwards, and the diaphragm pump arranged in the body and used for being connected with the fluid input end and the fluid output end.

Furthermore, the outlet water pressure range of the high-pressure cleaning machine is 0.2-1.5MPa, and the flow range is 1.3-4.2L.

Further, the high pressure washer is configured to have selectable: a pressure cleaning mode and a flow cleaning mode; the pressure of the pressure cleaning mode is larger than that of the flow cleaning mode, and the flow of the pressure cleaning mode is smaller than that of the flow cleaning mode.

Further, when the high-pressure cleaning machine is in a pressure cleaning mode, the water outlet pressure of the high-pressure cleaning machine is 0.2-1.5 MPa; when the high-pressure cleaning machine is in a flow cleaning mode, the water outlet flow of the high-pressure cleaning machine is 1.3-4.2L.

The invention has the beneficial effects that: the ejector mechanism is arranged and provided with a contact surface which is in contact with the dynamic area, and the projection of the contact surface on the diaphragm along the movement direction of the ejector mechanism always covers the dynamic area, so that the ejector mechanism always and comprehensively assists in bearing the pressure of the dynamic area, the hardness of the diaphragm is indirectly improved, the volumetric efficiency of a pressure chamber is improved, the effluent pressure is further improved, and the problem of pressure relief is avoided;

the invention has simple structure and convenient operation.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a schematic structural view of a high pressure washer of the present invention.

Fig. 2 is an exploded view of the diaphragm pump of the present invention.

Fig. 3 is a top view of a diaphragm pump of the present invention.

Fig. 4 is a cross-sectional view of a diaphragm pump of the present invention.

Fig. 5 is a schematic structural diagram of the septum and plug mechanism of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. In the description of the present invention, the axis direction coincides with the height direction.

Referring to fig. 1, a high pressure cleaner 100 according to a preferred embodiment of the present invention includes a main body 1, a fluid input end 2 disposed on the main body 1, and a fluid output end 3 for spraying fluid outwards, and further includes a diaphragm pump 5 disposed in the main body 1 and connected to the fluid input end 2 and the fluid output end 3. The main body 1 includes a gun body 11 and a functional component 12 connected to the gun body 11, the gun body 11 includes a housing 111 and a gun rod 112 disposed on the housing 111, and more specifically, the housing 111 includes a main body portion 1111 and a holding portion 1112 connected to the main body portion 1111. The functional component 12 is a start switch, the grip 1112 is provided with a hollow portion having a ring-shaped configuration, and the start switch 12 is provided in the ring-shaped hollow portion. Under the control of an external force, the start switch 12 is brought into contact with or separated from the grip 1112 to cause the high pressure cleaner 100 to feed or spray water. When using the high pressure washer 100, the user holds the grip 1112 near one side of the activation switch 12 and controls the activation switch 12 with one hand, and holds the grip 1112 with the other hand to separate the pressure applied to the user by the hand-held washer. An oval ring is further provided at one end of the grip 1112, and when the high-pressure washer 100 is not in use, the oval ring is held by one hand, which is a relatively labor-saving manner.

The fluid input port 2 is connected to the main body 1111, the fluid output port 3 is provided on one side of the gun rod 112, and the diaphragm pump 5 is provided in the main body 1111 and located above the fluid input port 2 between the gun rod 112 and the grip 1112. In this embodiment, the fluid input end 2 is a water inlet mechanism 2 communicated with a diaphragm pump 5, and the fluid output end 3 is a nozzle 3 communicated with the diaphragm pump 5. The water inlet mechanism 2 comprises a water inlet pipeline 21 for connecting the diaphragm pump 5 and an external water source, and a transmission pipeline 31 for transmitting fluid is arranged between the nozzle 3 and the diaphragm pump 5. Pressing the start switch 12 to make the start switch 12 contact with the grip 1112, the diaphragm pump 5 operating under the control of the power system and controlling the water inlet pipe 21 to transport the outside water flow to a water storage container (not shown) in the high pressure cleaner 100 through the water inlet pipe 21; the membrane pump 5 operates under the control of the electric system and controls the fluid to be delivered to the nozzle 3 through the delivery pipe 31 and sprayed toward the washing target. The barrel 112 includes a head and a tail 1122. In this embodiment, in order to make the water path arrangement of the high pressure washer 100 reasonable and the appearance small and light, the water inlet mechanism 2 is disposed below the lance head 1121 and on one side of the grip 1112. Indeed, in other embodiments, the water inlet mechanism 2 may be disposed at other positions on the gun body 11, which is not limited herein, according to the actual situation.

The high pressure cleaning machine 100 further includes an electric power mechanism 4 disposed on the gun head 1121 for providing electric power to the whole machine, in this embodiment, the electric power mechanism 4 is a battery pack, and indeed, in other embodiments, the electric power mechanism 4 may also be a power cord and a plug connected to an external power system for providing electric power, which is not specifically limited herein, depending on the actual situation.

The high pressure cleaner 100 using the diaphragm pump 5 has an outlet pressure of 0.2 to 1.5MPa and a flow rate of 1.3 to 4.2L, and more particularly, when the outlet pressure of the high pressure cleaner 100 is 1.36MPa and the flow rate of 1.4L, the cleaning effect of the high pressure cleaner 100 is the best, and the high pressure cleaner has a strong impact force to wash away stains. For the high pressure cleaner 100, the better cleaning effect is achieved: the pressure is high, and the cleaning effect is realized by the pressure; or the flow is large, and the cleaning effect is realized by the flow. The high pressure washer 100 using the diaphragm pump 5 can be configured to have a pressure and flow rate compatible, and can be configured to have a pressure washing mode and a flow rate washing mode selectable. Namely, under the pressure cleaning mode, the effluent pressure is 0.2-1.5MPa, and the cleaning effect is realized mainly through the pressure; and in the flow cleaning mode, the flow is 1.3-4.2L, the cleaning effect is realized mainly through the flow, in addition, the pressure of the pressure cleaning mode is greater than that of the flow cleaning mode, and the flow of the pressure cleaning mode is less than that of the flow cleaning mode. The user can switch to different cleaning modes according to the requirement. For example, when the water pipe is externally connected to a smaller water container, the pressure cleaning mode can be switched to use, namely, the water can be fully utilized under the condition of less water; when the water pipe is externally connected to a lake, a swimming pool and the like, the flow cleaning mode can be switched, and the characteristic that the water amount of the lake and the swimming pool is large is fully utilized. Preferably, the high-pressure cleaning machine has the effluent pressure of 0.5-1.5Mpa in a pressure cleaning mode; under the flow cleaning mode, the water outlet flow is 2-3.5L, so that the cleaning effect is better.

The diaphragm pump 5 also has the advantages of small size, good sealing performance, low energy consumption and the like, is convenient to hold, and the handheld high-pressure cleaning machine 100 using the diaphragm pump 5 can achieve the purposes of saving and efficient cleaning while realizing the cleaning function. When the handheld high-pressure cleaning machine 100 adopts the plunger pump, the high-pressure cleaning machine 100 realizes the cleaning effect by matching a certain flow with a strong water pressure, a pressure chamber of the plunger pump is small and is arranged around the plunger, and if the flow of the pressure chamber needs to be increased, the diameter of the plunger or the stroke range of the plunger needs to be increased. However, once the diameter of the plunger is increased, the volume of the entire plunger pump becomes large, which is not suitable for the hand-held high-pressure washer 100 in this embodiment.

Referring to fig. 2 to 5, the diaphragm pump 5 includes a pump body 51, a diaphragm 52 disposed on two sides of the pump body 51, a cover 53 covering the diaphragm 52 and forming a pressure chamber 56 with the diaphragm 52, and a driving mechanism 54 disposed in the pump body 51, wherein the driving mechanism 54 drives the diaphragm 52 to deform to change the volume of the pressure chamber 56. In the present embodiment, both sides of the pump body 51 are provided with the diaphragms 52, and correspondingly, both sides of the pump body 51 are provided with the covers 53 and form the first pressure chamber and the second pressure chamber with the diaphragms 52, respectively, and the first pressure chamber and the second pressure chamber are symmetrically arranged and have the same structure. The diaphragm 52 is made of neoprene, viton, or nitrile rubber, or any other material, such as flexible metal, in this embodiment, the material of the diaphragm 52 is not specifically limited, as long as the diaphragm 52 can deform well and adapt to the upper limit of the normal pressure.

The diaphragm pump 5 further includes a chamber water inlet 511 disposed on the pump body 51 and a chamber water outlet 512 communicated with the chamber water inlet 511, and the chamber water inlet 511 and the chamber water outlet 512 are disposed side by side and disposed at one side of the coupling 542. The diaphragm 52 has a first opening 5221 and a second opening 5222 respectively formed at positions corresponding to the chamber water inlet 511 and the chamber water outlet 512, so that the chamber water inlet 511 and the chamber water outlet 512 are communicated with the pressure chamber 56. Indeed, in other embodiments, the chamber water inlet 511 and the chamber water outlet 512 may be disposed on two sides of the coupling 542 or at other positions, which are not limited herein, depending on the actual situation.

The diaphragm pump 5 also includes a water inlet check valve in communication with the chamber water inlet 511 for controlling the flow of liquid into the diaphragm pump 5 and a water outlet check valve in communication with the chamber water outlet 512 for controlling the flow of liquid out of the diaphragm pump 5. The diaphragm pump 5 further has a pump body inlet 513 connected to the water inlet pipe 21 and a pump body outlet 514 connected to the transmission pipe 31, in this embodiment, the pump body inlet 513 and the pump body outlet 514 are respectively disposed at two sides of the pump body 51 and respectively connected to the water inlet check valve and the water outlet check valve. Indeed, in other embodiments, the pump body water inlet 513 and the pump body water outlet 514 may be disposed on a side surface of the pump body 51 or other positions, which are not limited herein, depending on the actual situation. The water inlet check valve provided at one side of the chamber water inlet 511 allows only water to flow into the pressure chamber 56 from the chamber water inlet 511, and does not allow water in the pressure chamber 56 to flow out from the chamber water inlet 511. In contrast, the outlet check valve disposed on the side of the chamber outlet 512 only allows the water inside the pressure chamber 56 to flow out from the chamber outlet 512, but does not allow the water outside the pressure chamber 56 to flow into the pressure chamber 56 from the chamber outlet 512.

The diaphragm pump 5 further includes a ram mechanism 55 driven by the driving mechanism 54 and pressing up the diaphragm 52 to deform the diaphragm 52 to change the volume size of the pressure chamber 56, the ram mechanism 55 having a contact surface 551 which is in contact with the diaphragm 52 to press up the diaphragm 52, the diaphragm 52 having a dynamic region 521 which is in contact with the contact surface 551 to be deformed to change the volume size of the pressure chamber 56, a projection of the contact surface 551 on the diaphragm 52 in the moving direction of the ram mechanism 55 always covering the dynamic region 521. For a pump, the "variable volume", the flow rate of the pump determines the upper pressure limit of the pump, and the "volumetric efficiency" determines the upper pressure limit that the pump can fit properly. The "volumetric efficiency" of the membrane pump is determined by a number of parameters, such as the torque of the motor, the stiffness of the membrane 52, etc. This application takes place making pressure chamber 56 of deformation at diaphragm 52 and diminishes, to the fluid pressurization in pressure chamber 56 in-process, along with fluid pressure's grow gradually, the reverse power of applying to diaphragm 52 of pressure fluid has contact surface 551 to assist all the time to support, avoids appearing the condition of pressure release, and the top mechanism 55 can drive dynamic region 521 and take place the biggest deformation in order to assist the pressure that bears pressure chamber 56 promptly, and indirect maximum improvement diaphragm 52's hardness is in order to improve the volumetric efficiency.

The ejector mechanism 55 may be a semi-circular body, and the contact surface 551 is an arc surface convex toward the dynamic region 521 to make sufficient contact with the diaphragm 52. During the process of lifting diaphragm 52 by ejector mechanism 55, the deformed portion of diaphragm 52 approaches an arc shape, and contact surface 551 is configured to be more arcuate to conform to the deformed portion of diaphragm 52 to prevent pressure relief problems. Indeed, in other embodiments, the shape of the contact surface 551 may be other shapes, such as a flat surface, etc., and is not limited herein, depending on the actual situation. In order to provide better contact between tip mechanism 55 and septum 52, contact surface 551 and/or the side of septum 52 facing tip mechanism 55 may be smooth or uneven. If the contact surface 551 is an uneven surface, specifically, the contact surface 551 is provided with grooves which are regularly or dispersedly arranged, and one surface of the diaphragm 52 facing the ejector mechanism 55 is provided with corresponding protrusions; alternatively, contact surface 551 may be provided with regularly or randomly arranged protrusions, and the side of septum 52 facing ejector mechanism 55 may be provided with corresponding grooves. In this embodiment, the arc-shaped surface 551 is provided with a convex arc-shaped surface 551, which increases the friction force with the diaphragm 52 to better lift the diaphragm 52 and deform it. Indeed, in other embodiments, the uneven surface may also be a wavy surface or other shapes, the arc surface may also be a smooth surface, and the surface of the diaphragm 52 facing the arc surface 551 is provided with a bump or a groove or a structure with other shapes, so as to achieve the results of increasing the friction force, further increasing the area of deformation and improving the volumetric efficiency of the pressure chamber 56, which is not specifically limited herein, depending on the actual situation.

The membrane pump 5 may further comprise a protruding bump (not shown) protruding outwards from the contact surface 551, and the membrane 52 is provided with a recessed groove (not shown) for cooperating with the protruding bump, and the protruding bump cooperates with the recessed groove to realize that the tip mechanism 55 moves the dynamic region 521 of the membrane 52 towards the side facing away from the pressure chamber 56. The shape of the protruding block is not limited, and only needs to be matched with the concave groove to achieve the effect that the plug mechanism 55 drives the dynamic region 521 of the diaphragm 52 to move towards the side away from the pressure chamber 56, which is not specifically limited herein, and depends on the actual situation.

The driving mechanism 54 includes a motor and an eccentric 541 connected to the motor, and the diaphragm pump further includes a coupling 542 connected to the eccentric 541 and performing a reciprocating motion, wherein the coupling 542 drives the ram mechanism 55 to move under the driving of the driving mechanism 54, so that the contact surface 551 pushes the dynamic region 521 to deform. The plug mechanism 55 is connected with one end of the coupler 542 close to the pressure chamber 56 and is driven by the coupler 542 to move, and the coupler 542 and the plug mechanism 55 are integrally formed or the coupler 542 and the plug mechanism 55 are arranged in a split mode. In this embodiment, the plug mechanism 55 is connected to the coupler 542, the plug mechanism 55 is fixedly disposed on the coupler 542, and the fixing manner may be laser welding or cavity glue bonding, which is not specifically limited herein; or the plug mechanism 55 may be provided integrally with the coupling 542. In terms of simplicity and convenience of the manufacturing process, the ejector mechanism 55 and the coupler 542 are preferably arranged integrally, so that the production steps and the assembling steps are simplified, labor is saved, and the device is rapid and convenient. Indeed, in other embodiments, the plug mechanism 55 may also be separately disposed on one side of the coupler 542, the coupler 542 is driven by the motor and the eccentric 541 to move so as to drive the plug mechanism 55 to move, the plug mechanism 55 and the coupler 542 may be made of materials with different hardness, the hardness of the plug mechanism 55 is stronger than that of the coupler 542, and the weight of the cleaning machine and the pressure of the diaphragm pump are both considered. In the embodiments described above, the contact surface 551 is provided by a single component, and in still other embodiments, the coupling 542 and the ram mechanism 55 are provided separately, the side of the coupling 542 facing the diaphragm 52 also providing the contact surface 551 to deform the diaphragm 52, and the side of the coupling 542 adjacent to the diaphragm 52 is actually the ram mechanism 55, where the contact surface 551 is provided by multiple components. It is understood that the components used to provide the contact surface 551 are within the scope of the present heading mechanism 55.

The diaphragm 52 further includes a static area 522 connected to the dynamic area 521, and a surrounding portion 523 disposed at the periphery of the dynamic area 521 and the static area 522, wherein the surrounding portion 523 is fixedly disposed between the pump body 51 and the cover 53, and the cover 53 is fixedly connected to the surrounding portion 523 to cover the diaphragm 52. Surround 523, be formed with between static region 522 and the dynamic region 521 and join limit 524, in the motion process, when diaphragm 52 warp to the maximum position, the outside limit of contact surface 551 is close to join limit 524 setting or overlaps the setting with joining limit 524, in this embodiment, when diaphragm 52 warp to the maximum position, the outside limit of contact surface 551 overlaps the setting with joining limit 524, top mechanism 55 assists the pressure that bears dynamic region 521 this moment, the hardness that has indirectly promoted diaphragm 52 is in order to improve the volumetric efficiency of pressure chamber 56, and then promote water pressure, avoid the problem of pressure release to take place.

The periphery of the lid 53 is connected to the surrounding portion 523 to seal the diaphragm 52 to the pump body 51. As described above, the first opening 5221 and the second opening 5222 are disposed on the static region 522 and are in communication with the chamber water inlet and the chamber water outlet. In this embodiment, the static area 522 is disposed on one side of the dynamic area 521, in other embodiments, the static area 522 may also be disposed on the outer side of the dynamic area 521 and disposed around the dynamic area 521, and the surrounding portion 523 is disposed on the outermost side of the static area 522 and disposed around the static area 522, which is not specifically limited herein, depending on the actual situation.

To sum up: by arranging the plug mechanism 55, the plug mechanism 55 is provided with a contact surface 551 which is in contact with the dynamic area 521, and the projection of the contact surface 551 on the diaphragm 52 along the movement direction of the plug mechanism 55 always covers the dynamic area 521, so that the plug mechanism 55 always and comprehensively assists in bearing the pressure of the dynamic area 521, the hardness of the diaphragm 52 is indirectly improved, the volumetric efficiency of the pressure chamber 56 is improved, the water outlet pressure is further improved, and the problem of pressure relief is avoided;

the invention has simple structure and convenient operation.

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

The above examples only show some 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 (12)

1. A diaphragm pump comprises a pump body, a diaphragm arranged on the side of the pump body, a cover arranged on the diaphragm and a cover body forming a pressure chamber with the diaphragm, and a driving mechanism arranged in the pump body, wherein the diaphragm is provided with a dynamic area which deforms to change the volume of the pressure chamber.

2. The diaphragm pump of claim 1 wherein said contact surface and/or said diaphragm surface facing said plunger mechanism is smooth or uneven.

3. The diaphragm pump according to claim 2, wherein said contact surface and/or said diaphragm side facing said head means are provided with regularly or randomly arranged grooves or protrusions; or the contact surface and/or the surface of the diaphragm facing the plug mechanism are/is a wave-shaped plane.

4. The diaphragm pump of claim 1 wherein said contact surface is an arcuate surface convex in a direction toward said dynamic region.

5. The diaphragm pump according to claim 1, further comprising a protruding bump located on said contact surface and protruding outward, said diaphragm having a recessed groove for engaging said protruding bump, said protruding bump engaging said recessed groove to enable said plunger mechanism to move said dynamic region of said diaphragm toward a side facing away from said pressure chamber.

6. The diaphragm pump of claim 1 wherein said drive mechanism is made of a first material and said ram mechanism is made of a second material, said second material having a hardness greater than a hardness of said first material.

7. The diaphragm pump of claim 1 wherein said drive mechanism comprises a reciprocating shaft coupling, said ram mechanism is connected to an end of said shaft coupling adjacent to said pressure chamber and is moved by said shaft coupling, said shaft coupling is integrally formed with said ram mechanism or said shaft coupling is separate from said ram mechanism.

8. The diaphragm pump of claim 1, wherein said diaphragm further comprises a static region disposed at rest on one side of said dynamic region, and a surrounding portion surrounding said dynamic region and said static region, said surrounding portion being secured between said pump body and said cover body.

9. A high pressure washer comprising a body, a fluid input disposed on the body, and a fluid output for ejecting fluid outwardly, the high pressure washer further comprising a diaphragm pump according to any one of claims 1 to 8 disposed within the body and configured to be connected to the fluid input and the fluid output.

10. The pressure washer according to claim 9, wherein the outlet water pressure of the pressure washer is in the range of 0.2-1.5MPa and the flow rate is in the range of 1.3-4.2L.

11. The high pressure washer according to claim 9, wherein the high pressure washer is configured with selectable: a pressure cleaning mode and a flow cleaning mode; the pressure of the pressure cleaning mode is larger than that of the flow cleaning mode, and the flow of the pressure cleaning mode is smaller than that of the flow cleaning mode.

12. The pressure washer according to claim 11, wherein when the pressure washer is in the pressure washing mode, the outlet water pressure is 0.2 to 1.5 MPa; when the high-pressure cleaning machine is in a flow cleaning mode, the water outlet flow of the high-pressure cleaning machine is 1.3-4.2L.

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