Pressure Washers

Abstract

The present invention relates to a pressure cleaning machine, comprising a pump and a motor for driving the pump to operate, and a transmission mechanism arranged between the pump and the motor; the pump comprises: a plunger, the plunger is connected to the transmission mechanism, the transmission mechanism is used to convert the rotational motion of the motor into the reciprocating motion of the plunger, the pump body comprises a receiving body for receiving the plunger, and an inlet and outlet water cavity shell for the cleaning liquid to flow in and out; the receiving body and the inlet and outlet water cavity shell are separately arranged, and the inlet and outlet water cavity shell is configured as a structure that inhibits chemical reactions with the cleaning liquid. The beneficial effects of the present invention are: the receiving body and the inlet and outlet water cavity shell are independently formed, the material of the inlet and outlet water cavity shell does not produce a chemical reaction with the cleaning liquid, and no new substances are produced to affect the operation of the pump, thereby ensuring the stability of the operation of the pump.

Description

Technical Field

[0001] The invention relates to a pressure cleaning machine, in particular to a pressure cleaning machine using a plunger pump. Background Art

[0002] At present, most pressure washers on the market use plunger pumps. Through the reciprocating motion of the plunger, the high-pressure chamber is compressed to generate a high-pressure water flow. The plunger pump is widely selected due to its advantages of high pressure and large flow. However, the pump body is designed with die-cast aluminum material. On the one hand, the entire pump body is made of metal aluminum, which is not only costly and heavy, but also in the long-term use process, the aluminum material of the pump body is in contact with water for a long time, and the aluminum is oxidized to produce white powder. The white powder flows into the one-way valve and is easily attached to the valve core, causing the one-way valve to fail, and ultimately causing the self-priming function of the whole machine to fail.

[0003] There is another type of pump whose pump body is made of plastic injection molding. However, although the pump body made of plastic injection molding can solve the technical problem of one-way valve failure caused by the generation of oxidized powder, the plastic material pump body has insufficient structural strength and usually cannot withstand too much force generated by the reciprocating motion of the plunger on the pump body. Therefore, the pump body of the plunger pump made of plastic often has a small pressure and flow rate, and is mostly used in some sprayers, and is not suitable for high-pressure cleaning machines that have relatively high requirements for pump flow and pressure. Summary of the invention

[0004] In order to overcome the defects of the prior art, the problem to be solved by the present invention is to provide a pressure cleaning machine with stable self-priming function and high flow rate and pressure.

[0005] The technical solution adopted by the present invention to solve the problems of the prior art is:

[0006] A pressure washer comprises a pump, a motor for driving the pump, and a transmission mechanism arranged between the pump and the motor;

[0007] The pump comprises:

[0008] A plunger, the plunger is connected to the transmission mechanism, the transmission mechanism is used to convert the rotational motion of the motor into the reciprocating motion of the plunger;

[0009] a high-pressure chamber, wherein the plunger is driven to compress or release the high-pressure chamber so that the cleaning liquid flows into the high-pressure chamber and pressurizes the cleaning liquid in the high-pressure chamber;

[0010] A pump body, comprising a receiving body for receiving the plunger, and an inlet and outlet water cavity housing for allowing the cleaning liquid to flow into the high-pressure chamber and for allowing the cleaning liquid pressurized by the high-pressure chamber to flow out;

[0011] A pump cover is fixedly mounted on the pump body, the high-pressure chamber is formed in the pump cover, and is connected to the water inlet and outlet chamber housing through a one-way valve, and the cleaning liquid is pressurized by the high-pressure chamber and then transported outward through the water inlet and outlet chamber housing;

[0012] The receiving body is separately provided from the water inlet and outlet chamber shell, and the water inlet and outlet chamber shell is configured as a structure that inhibits chemical reaction with the cleaning liquid.

[0013] In one preferred embodiment, the water inlet and outlet chamber housing is made of plastic or rubber.

[0014] In one preferred embodiment, a barrier layer is provided on the inner wall of the high-pressure chamber to prevent the first pump cover and the second pump cover from chemically reacting with the cleaning liquid.

[0015] In one preferred embodiment, the number of the plunger is one, the pump cover includes a first pump cover and a second pump cover respectively fixedly mounted on both ends of the pump body, and the high-pressure chamber includes a first high-pressure chamber formed in the first pump cover and a second high-pressure chamber formed in the second pump cover.

[0016] In a preferred embodiment, the pump cover is made of plastic or rubber.

[0017] In one preferred embodiment, the container is made of aluminum material, and a sealing structure is arranged between the high-pressure chamber and the container, and the sealing structure is used to seal the high-pressure chamber and isolate the high-pressure chamber from the container, so that the cleaning liquid does not contact the container during the circulation process.

[0018] In one preferred embodiment, the water inlet and outlet chamber shell includes a circulation channel for the cleaning liquid to flow in and out, the circulation channel includes a liquid inlet channel and a liquid outlet channel which are both arranged through, the extension direction of the liquid inlet channel and the extension direction of the liquid outlet channel are parallel to each other, the water inlet and outlet chamber shell is also provided with a liquid inlet for the cleaning liquid to enter and a liquid outlet for the cleaning liquid to be discharged, the liquid inlet is communicated with the liquid inlet channel, and the liquid outlet is communicated with the liquid outlet channel.

[0019] In a preferred embodiment, the axis line of the liquid inlet and the axis line of the liquid outlet are parallel to each other and define a plane, and the plane is perpendicular to the extension direction of the liquid inlet channel and the liquid outlet channel.

[0020] In one preferred embodiment, the plane is located above the center of the liquid inlet channel and the liquid outlet channel in the length extension direction thereof.

[0021] In one preferred embodiment, the pressure washer is a handheld pressure washer, which includes a shell, in which the motor and the pump are both accommodated, and the shell also includes a handle for holding. The pressure washer also includes a battery pack for powering the motor, and the battery pack is connected to the shell.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the plunger's receiving body and the water inlet and outlet chamber shell are separately arranged, and are made of different materials respectively. The receiving body is made of aluminum, and the water inlet and outlet chamber shell is made of plastic injection molding. On the one hand, the mechanical strength of the plunger receiving body is guaranteed, so that the plunger can be made larger and thicker to increase the pressure or flow. On the other hand, the entire water flow path does not contact the cleaning liquid, and no chemical reactants are produced to affect the normal use of the one-way valve, thereby ensuring the self-priming stability of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above-mentioned objectives, technical solutions and beneficial effects of the present invention can be achieved through the following drawings:

[0024] Figure 1 It is a perspective view of the functional parts of the pressure washer of the present invention.

[0025] Figure 2 yes Figure 1 The functional components of the pressure washer are shown in cross-section along AA.

[0026] Figure 3 yes Figure 1 A top view of the functional components of the pressure washer is shown.

[0027] Figure 4 yes Figure 3 The cross-sectional view along BB in the top view is shown. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] like Figure 1 , which is a three-dimensional diagram of the functional components of a pressure washer in one embodiment of the present invention, wherein the functional components include a motor 20, a speed reduction mechanism 30 connected to the motor 20, a pump 40 driven by the speed reduction mechanism 30, and a liquid inlet pipeline 50 and a liquid outlet pipeline 60 respectively connected to the pump 40. The motor 20, the speed reduction mechanism 30 and the pump 40 are connected in sequence, and the speed reduction mechanism 30 is specifically a gear speed reduction mechanism. It can be understood that the functional components may not include the speed reduction mechanism 30, but the motor 20 is directly connected to the pump 40, and the motor 20 directly drives the pump 40 to operate.

[0032] For the convenience of description, the pump 40, the speed reduction mechanism 30, and the motor 20 are defined as being connected in sequence from front to back, and the pump 40 is located in front of the motor 20. The pump 40 has a length direction, which is the same as the length extension direction of the plunger 41 and is perpendicular to the front-rear direction.

[0033] Please also see Figure 2 The pump 40 includes a pump body 46, a plunger 41 accommodated in the pump body, and a pump cover arranged at both ends of the pump body 46. The pump cover is fixedly mounted on the pump body 46, and a high-pressure chamber is formed in the pump cover, and is connected to the inlet and outlet water chamber housing through a one-way valve. After the cleaning liquid is pressurized by the high-pressure chamber, it is transported outward through the inlet and outlet water chamber housing. In this embodiment, there is only one plunger 41, and the pump cover includes a first pump cover 47 and a second pump cover 48. The first pump cover 47 and the second pump cover 48 are respectively fixedly connected to the two ends of the pump body 46. The first pump cover 47 and the second pump cover 48 are both provided with a concave cavity, and the concave cavity forms a high-pressure chamber for pressurizing the cleaning liquid. The high-pressure chamber includes a first high-pressure chamber formed in the first pump cover 47 and a second high-pressure chamber formed in the second pump cover 48. The two ends of the plunger 41 extend into the first high-pressure chamber and the second high-pressure chamber respectively, and are driven to reciprocate in the pump body to alternately compress or release the first high-pressure chamber or the second high-pressure chamber. It is understandable that in other embodiments, the number of plungers is one and the number of pump covers is one. In another embodiment, the number of plungers may also be multiple.

[0034] The pump 40 further includes a liquid inlet 44 for the inflow of cleaning liquid and a liquid outlet 42 for the discharge of cleaning liquid. The liquid inlet 44 is connected to the liquid inlet pipeline 50, and the liquid outlet 42 is connected to the liquid outlet pipeline 60. The fluid medium enters from the liquid inlet pipeline 50, enters the inside of the pump 40 through the liquid inlet 44 of the pump, and is discharged into the liquid outlet pipeline 60 through the liquid outlet 42 after being pressurized. The liquid inlet 44 and the liquid outlet 42 are both opened at the front end of the pump 40, located on the same side of the plunger 41, and have the same opening direction and are both forward, and are both consistent with the opening direction of the liquid outlet pipeline 60.

[0035] The pressure washer also includes a transmission mechanism for converting the rotational motion of the motor 20 into the reciprocating motion of the plunger 41. In this embodiment, the transmission mechanism is connected to the motor 20 through the reduction mechanism 30, and the rotational motion of the motor 20 is transmitted to the transmission mechanism after being decelerated by the reduction mechanism 30, and the transmission mechanism converts the decelerated rotational motion into the reciprocating motion of the plunger 41. It can be understood that the reduction mechanism 30 is not provided between the motor 20 and the pump 40, and the transmission mechanism is directly connected to the motor 20 to convert the rotational motion of the motor 20 into the reciprocating motion of the plunger 41. Specifically, the transmission mechanism is an eccentric mechanism 49, and the eccentric mechanism 49 includes a main shaft 49b and an eccentric shaft 49a, and the eccentric shaft 49a is arranged at one end of the main shaft 49b, and the axis of the eccentric shaft 49a is arranged to deviate from the axis of the main shaft 49b, and the main shaft 49b is connected to the motor 20 through the reduction mechanism 30, and the eccentric shaft 49a is directly connected to the plunger 41, and drives the plunger 41 to reciprocate under the drive of the motor 20.

[0036] The plunger 41 has a mounting portion for mounting the eccentric mechanism 49 on the side perpendicular to the length direction of the plunger 41. In this embodiment, the mounting portion is a concave cavity that is recessed inwards. And the mounting portion is approximately located at the center of the length extension direction of the plunger 41. The eccentric mechanism 49 is mounted in the mounting portion by mounting a bearing.

[0037] Preferably, the plunger 41 is made of a metal material, and the two ends of the plunger 41 are hollow and filled with a material with a lower density, which can reduce the mass of the plunger, thereby reducing the vibration problem of the plunger 41 during the reciprocating motion, and also reduce the power of the plunger, reducing energy consumption. In this embodiment, the filling material is plastic, and other embodiments may also use resin or light metal, such as aluminum.

[0038] Since the plunger 41 performs high-frequency reciprocating motion in the pump body 46, the two ends of the plunger pressurize the high-pressure chamber alternately, and the transmission structure connects the middle part of the plunger to realize the free reciprocating motion of the two ends of the plunger 41, that is, the plunger 41 adopts an intermediate drive method, and the two ends of the plunger 41 are free. The transmission mechanism converts the rotational motion of the rotating shaft in the axial direction of the motor into the reciprocating motion of the plunger 41 perpendicular to the above-mentioned axial direction, causing the plunger 41 to vibrate during the reciprocating motion. The path of the reciprocating motion of the plunger perpendicular to the above-mentioned axial direction is limited and constrained by the pump body 46, so the force acting on the pump body 46 is relatively large.

[0039] In this embodiment, the plunger 41 is connected to the eccentric shaft 49a, which is a free end of the eccentric mechanism 49 and has an eccentric mass. When the eccentric mechanism 49 reciprocates around the rotation axis, the eccentric shaft 49a, as a free end, generates vibration. The vibration is transferred to the plunger 41, causing the plunger 41 to vibrate during the reciprocating motion. Therefore, if the mechanical strength of the pump body is not enough and cannot withstand the force of the plunger on the pump body, it is easy to cause the pump body to deform.

[0040] Based on the above analysis, the plunger 41 exerts a large force on the pump body 46 during the high-frequency reciprocating motion, and the mechanical strength requirements of the pump body 46 are relatively high. In order to ensure a certain mechanical strength, the usual practice is to form the pump body 46 by metal die-casting, generally made of relatively cheap aluminum die-casting. However, although the pump body 46 made of aluminum meets the mechanical strength requirements, aluminum is oxidized and produces particles due to long-term contact with water, which are easily attached to the one-way valve of the pump, causing the one-way valve to fail and affecting the normal working performance of the pump. In addition, the aluminum material is also heavy, which is not conducive to portability. If the pump body 46 is made of plastic injection molding, due to the insufficient mechanical strength of the plastic material, in order to limit the force of the plunger 41 on the pump body 46, the diameter and stroke of the plunger 41 should not be too large. Therefore, the pump made of plastic has a small pressure and flow rate, and is generally used in the field of sprayers. It is not applicable to pressure washers with high pressure and flow requirements.

[0041] In order to solve the above problems, in the present embodiment, the pump body 46 includes a receiving body 43 for receiving the plunger 41 and an inlet and outlet water chamber shell 45 for the circulation of the cleaning liquid, and the receiving body 43 and the inlet and outlet water chamber shell 45 are separately arranged. Since the inlet and outlet water chamber shell 45 and the receiving body 43 have different functions, their design requirements are not exactly the same. The inlet and outlet water chamber shell 45 is required to have the function of transmitting the cleaning liquid, and the requirements for strength and process manufacturing are not high, while the receiving body 43 is used to receive the working parts such as the plunger 41, and needs to have greater strength and higher process precision. In the present embodiment, the receiving body 43 and the inlet and outlet water chamber shell 45 are separately arranged, and different materials and manufacturing processes can be selected according to the performance requirements of the receiving body 43 and the inlet and outlet water chamber shell 45, respectively, to avoid the use of a unified material, but need to meet the more stringent functional requirements, resulting in higher costs and difficulties.

[0042] The housing 43 is made of metal material to ensure the mechanical strength of the pump body. Specifically, the housing 43 can be made of aluminum, magnesium alloy, or stainless steel. In this embodiment, the housing 43 is made of aluminum. On the one hand, the cost of aluminum is low, and on the other hand, aluminum is also a light metal, which can relatively reduce the weight of the pump.

[0043] The water inlet and outlet chamber housing 45 is configured as a structure that inhibits chemical reactions with the cleaning liquid. Avoid the influence of the generated new substances on the operation of the pump. Specifically, plastic or rubber materials are preferably used to effectively reduce costs and weight. Compared with the use of metal aluminum or other alloy materials, on the one hand, the manufacturing process is simple and the cost is low. On the other hand, it avoids the contact between the cleaning liquid and the metal (such as aluminum), which easily oxidizes the metal (aluminum) to form powder / particles, adheres to the one-way valve, and hinders the smooth opening and closing of the one-way valve, making the pump self-priming ineffective. Preferably, the water inlet and outlet chamber housing 45 is integrally formed.

[0044] In this embodiment, the first pump cover 47 and the second pump cover 48 are both configured as structures that inhibit chemical reactions with the cleaning machine liquid. Preferably, the first pump cover and the second pump cover are specifically configured to be made of plastic or rubber. Since the first and second pump covers will directly contact the cleaning liquid, the first and second pump covers are configured to be made of a material that reacts chemically with the cleaning liquid, which also inhibits chemical reactions, such as the influence of new substances generated by the chemical reaction on the operation of the pump. It is specifically preferred to use plastic or rubber materials to effectively reduce costs and weight.

[0045] In another embodiment, a barrier layer is provided on the inner wall of the high pressure chamber, the barrier layer does not chemically react with the cleaning liquid, and can prevent the cleaning liquid from directly contacting the first and second pump covers. In this way, the materials of the first pump cover 47 and the second pump cover 48 can be freely selected, such as aluminum, or other suitable materials, without having to consider that the products generated by the reaction between the materials of the first and second pump covers and the cleaning liquid affect the normal operation of the pump 40.

[0046] Since the container 43 is made of aluminum material, long-term contact between metal aluminum and cleaning liquids such as tap water will produce a chemical reaction to generate aluminum hydroxide, forming particles that adhere to the valve core of the one-way valve, affecting the normal operation of the one-way valve. In this embodiment, a sealing structure is provided between the high-pressure chamber and the container 43, which on the one hand seals the high-pressure chamber, and on the other hand isolates the high-pressure chamber from the container 43 so that the cleaning liquid circulating in the high-pressure chamber does not contact the container 43. The use of a sealing structure prevents the cleaning liquid from directly contacting the container, does not generate oxidized particles, and avoids the risk of adhering to the one-way valve and causing the one-way valve to fail, thereby ensuring the stable working performance of the pump.

[0047] The receiving body 43 includes a receiving cavity for receiving the plunger 41, and the receiving cavity is arranged through the receiving body 43. The two ends of the plunger 41 can extend from the two ends of the receiving cavity and extend into the pump covers at the two ends respectively. Specifically, the two ends of the plunger 41 extend into the first high-pressure chamber and the second high-pressure chamber respectively, and are driven to reciprocate in the receiving cavity to alternately compress or release the first high-pressure chamber and the second high-pressure chamber.

[0048] See also Figure 3 and Figure 4 , the water inlet and outlet chamber housing 45 is provided with a cleaning liquid circulation channel. The circulation channel is connected to the high-pressure chamber through a one-way valve, and the cleaning liquid is pressurized by the high-pressure chamber and then transported outward through the circulation channel. The cleaning liquid circulation channel includes an inlet channel 452 and an outlet channel 451 that are arranged through. The inlet channel 452 is parallel to the extension direction of the outlet channel 451, and is the same as the length extension direction of the plunger 41, and is located on the same side of the plunger 41, specifically in front of the plunger 41, away from the side of the motor. The one-way valve includes an inlet one-way valve group and an outlet one-way valve group, and the inlet channel 452 is connected to the first high-pressure chamber and the second high-pressure chamber respectively through the inlet one-way valve group, and the outlet channel 451 is connected to the first high-pressure chamber and the second high-pressure chamber respectively through the outlet one-way valve group. The water inlet one-way valve group and the water outlet one-way valve group are driven to open or close alternately by the reciprocating motion of the plunger, thereby controlling the connection or disconnection between the liquid inlet channel 452 and the first high-pressure chamber and the second high-pressure chamber, and the connection and disconnection between the liquid outlet channel 451 and the first high-pressure chamber and the second high-pressure chamber.

[0049] Specifically, the water inlet check valve group includes a first water inlet check valve 452b and a second water inlet check valve 452a, which are respectively arranged between the liquid inlet channel 452 and the first pump cover 47, the second pump cover 48, and are used to unidirectionally connect the liquid inlet channel 452 and the first high-pressure chamber, the second high-pressure chamber, so that the cleaning liquid can only flow into the first and second high-pressure chambers from the liquid inlet pipeline; the water outlet check valve group includes a first water outlet check valve 451b and a second water outlet check valve 451a, which are respectively arranged between the liquid outlet channel 451 and the first pump cover 47, the second pump cover 48, and are used to unidirectionally connect the liquid outlet channel 451 and the first high-pressure chamber, the second high-pressure chamber, so that the cleaning liquid can only flow out from the first and second high-pressure chambers to the liquid outlet pipeline.

[0050] The second water inlet check valve 452a and the first water inlet check valve 452b can only allow water to flow through them into the first high-pressure chamber and the second high-pressure chamber, and the second water outlet check valve 451a and the first water outlet check valve 451b can only allow water to flow through them out of the first high-pressure chamber and the second high-pressure chamber, and the opening and closing of the water inlet check valve and the water outlet check valve are related to the water pressure in the high-pressure chamber, and the water inlet check valve and the water outlet check valve can be controlled by the change of water pressure. The plunger 41 is driven to alternately squeeze or release the high-pressure chamber to change the pressure in the high-pressure chamber, thereby driving the opening or closing of the water inlet check valve and the water outlet check valve.

[0051] The liquid inlet 44 and the liquid outlet 42 are both provided on the water inlet and outlet cavity housing 45. Specifically, the liquid inlet 44 and the liquid outlet 42 are both provided on the same side of the water inlet and outlet cavity housing 45, specifically, the front end of the water inlet and outlet cavity housing. The liquid inlet channel 452 is connected to the liquid inlet 44, and the liquid outlet channel 451 is connected to the liquid outlet 42. The axis lines of the liquid inlet 44 and the liquid outlet 42 are parallel to each other, and the length extension direction of the liquid inlet channel 452 is perpendicular to the axis line of the liquid inlet 44, and the length extension direction of the liquid outlet channel 451 is perpendicular to the axis line of the liquid outlet 42.

[0052] The pump is defined to have a center plane in the length direction, which is located in the middle of the liquid inlet channel and the liquid outlet channel in the length direction, and the length direction is perpendicular to the center plane. The pump 40 also has a width direction, which is perpendicular to the length direction and the front-rear direction.

[0053] The pressure washer is handheld, and has a roughly pistol-shaped housing, a trigger (not shown) disposed on the housing and used to control the handheld pressure washer to be in an open state or a closed state, and the housing includes a handle for holding, and the operator holds the handle with one hand, and can use the same hand to control the trigger at the same time. The handheld pressure washer also includes a battery pack for powering the motor 20, and the battery pack is connected to the housing, specifically disposed at the end of the handle. The functional components are arranged in the housing in the following manner: when the handheld pressure washer is in a normal holding cleaning state, the axis of the motor is arranged in the horizontal direction, and the plunger 41 is arranged in the upper and lower directions, that is, the length direction of the pump is parallel to the upper and lower directions.

[0054] In one embodiment, when the handheld pressure washer is in a normally held cleaning state, in the length direction, the axis line of the liquid outlet 42 is located above the axis line of the liquid inlet 44, and the axis line of the liquid outlet 42 is located above the mid-plane of the length direction of the pump 40.

[0055] In one embodiment, when the handheld pressure washer is in a normal grip cleaning state, in the width direction, there is a lateral distance between the axis of the liquid outlet 42 and the axis of the liquid inlet 44, and the axis of the liquid outlet 42 is located above the mid-plane. Preferably, the axis of the liquid outlet 42 and the axis of the liquid inlet 44 define a plane, which is parallel to the width direction and perpendicular to the length extension direction of the plunger, and the plane is located above the mid-plane. The plane is perpendicular to the extension direction of the liquid inlet channel and the liquid outlet channel, and the plane is located above the center of the liquid inlet channel 452 and the liquid outlet channel 451 in the length extension direction thereof.

[0056] The length extension direction of the plunger 41 is perpendicular to the opening direction of the liquid inlet 44 and the opening direction of the liquid outlet 42, respectively. The plunger 41 can be driven to reciprocate along its length direction. The liquid inlet 44 is used to connect to an external water source or a water pipe or a water gun. Water enters the interior of the pump 40 from the liquid inlet 44. Preferably, the number of the liquid inlet 44 is one. When the water is pressurized inside the pump 40, it is discharged from the liquid outlet 42. The liquid outlet 42 is usually connected to the nozzle of the pressure washer so that the nozzle can spray pressurized water. In order to avoid mutual interference between the inlet and outlet water, the liquid inlet 44 and the liquid outlet 42 are usually arranged separately. Preferably, the number of the liquid outlet 42 is one.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pressure washer, comprising a pump, a motor for driving the pump, and a transmission mechanism arranged between the pump and the motor; The pump comprises: A plunger, the plunger is connected to the transmission mechanism, the transmission mechanism is used to convert the rotational motion of the motor into the reciprocating motion of the plunger; a high-pressure chamber, wherein the plunger is driven to compress or release the high-pressure chamber so that the cleaning liquid flows into the high-pressure chamber and pressurizes the cleaning liquid in the high-pressure chamber; A pump body, comprising a receiving body for receiving the plunger, and an inlet and outlet water cavity housing for allowing the cleaning liquid to flow into the high-pressure chamber and for allowing the cleaning liquid pressurized by the high-pressure chamber to flow out; A pump cover, the pump cover comprises a first pump cover and a second pump cover respectively fixedly mounted at two ends of the pump body, the high-pressure chamber is formed in the pump cover, and is connected to the inlet and outlet water chamber housing through a one-way valve, and the cleaning liquid is pressurized by the high-pressure chamber and then transported outward through the inlet and outlet water chamber housing; The receiving body is separately provided from the water inlet and outlet chamber shell, and the water inlet and outlet chamber shell is configured as a structure that inhibits chemical reaction with the cleaning liquid.

2. The pressure washer according to claim 1, characterized in that The water inlet and outlet chamber housing is made of plastic or rubber.

3. The pressure washer according to claim 1, characterized in that: The inner wall of the high-pressure chamber is provided with a barrier layer to prevent the first pump cover and the second pump cover from chemically reacting with the cleaning liquid.

4. The pressure washer according to claim 1, characterized in that The number of the plunger is one, and the high-pressure chamber includes a first high-pressure chamber formed in the first pump cover and a second high-pressure chamber formed in the second pump cover.

5. The pressure washer according to claim 1, wherein: The pump cover is made of plastic or rubber.

6. The pressure washer according to claim 1, wherein: The container is made of aluminum material. A sealing structure is provided between the high-pressure chamber and the container. The sealing structure is used to seal the high-pressure chamber and isolate the high-pressure chamber from the container so that the cleaning liquid does not contact the container during circulation.

7. The pressure washer according to claim 1, wherein: The water inlet and outlet chamber shell includes a circulation channel for the cleaning liquid to flow in and out, and the circulation channel includes a liquid inlet channel and a liquid outlet channel that are both arranged through, and the extension direction of the liquid inlet channel is parallel to the extension direction of the liquid outlet channel. The water inlet and outlet chamber shell is also provided with a liquid inlet for the cleaning liquid to enter and a liquid outlet for the cleaning liquid to be discharged, the liquid inlet is communicated with the liquid inlet channel, and the liquid outlet is communicated with the liquid outlet channel.

8. The pressure washer according to claim 7, characterized in that The axis center line of the liquid inlet and the axis center line of the liquid outlet are parallel to each other and define a plane, and the plane is perpendicular to the extension direction of the liquid inlet channel and the liquid outlet channel.

9. The pressure washer according to claim 8, characterized in that The plane is located above the center of the liquid inlet channel and the liquid outlet channel in the length extension direction thereof.

10. The pressure washer according to claim 1, wherein: The pressure washer is a handheld pressure washer, which includes a shell, in which the motor and the pump are both accommodated, and the shell also includes a handle for holding. The pressure washer also includes a battery pack for powering the motor, and the battery pack is connected to the shell.

Images