Fluid switching valve and high-pressure cleaning machine with same

Abstract

The utility model discloses a fluid switching valve and a high-pressure cleaning machine with the fluid switching valve, and belongs to the technical field of valves, the fluid switching valve comprises a valve casing and a valve core, the valve casing is provided with an inlet and an outlet, the valve core is provided with a butt-joint inlet hole and a butt-joint outlet hole, the butt-joint inlet hole is selectively communicated with one inlet, the butt-joint outlet hole is communicated with the outlet, and the butt-joint inlet hole is communicated with the outlet. The valve element is rotatably arranged in the valve shell, the central axis of the valve element serves as a rotating center line, the inlets are distributed around the central axis of the valve element in the circumferential direction at intervals, an annular flow channel is formed between the valve element and the valve shell, and the butt joint outlet hole is communicated with the outlet through the annular flow channel. The high-pressure cleaning machine comprises a water tank, a pump, a spray head and the fluid switching valve. The specific structure of the fluid switching valve is reasonably improved, fluid flow path switching is achieved, meanwhile, the flow path structure is simplified, the internal structure of the valve is reasonably simplified, the production cost of the valve is reduced, and therefore the fluid switching valve meets the function requirement of the high-pressure cleaning machine, and meanwhile the cost of the high-pressure cleaning machine is reasonably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a fluid switching valve. In addition, the utility model also relates to a high-pressure cleaning machine using the fluid switching valve. Background Art

[0002] With the development of electric tools, cleaning machines are becoming more and more widely used, especially high-pressure cleaning machines, which usually include a machine body, a nozzle and a water pump. The water pump pressurizes and pumps the liquid to the nozzle, so that the liquid is sprayed from the nozzle. The liquid sprayed from the nozzle can be used to clean roads, walls, cars, bicycles, curtains, etc. In order to expand the application scenarios of high-pressure cleaning machines, existing high-pressure cleaning machines are generally equipped with a water tank. The water pump pressurizes and pumps the liquid in the water tank to the nozzle, so that the use of the high-pressure cleaning machine is not limited to the location of the water supply source, and the high-pressure cleaning machine can be moved to any location that needs to be cleaned to work.

[0003] In order to better remove stubborn stains, oil stains, etc., soap liquid is usually sprayed first to decompose the dirt, and then rinsed with clean water. Based on this, some high-pressure cleaners are equipped with two water tanks, one of which can hold soap liquid and the other can hold clean water. The two water tanks are connected to the liquid supply pipeline through a switching valve. The user can switch the water tank supplying liquid through the switching valve, so that the high-pressure cleaner can provide soap liquid or clean water according to the needs of use.

[0004] However, the internal structure of the switching valve currently used in high-pressure cleaning machines is relatively complex. In order to allow the liquid flowing in from one of the inlets to flow out smoothly from the outlet, a very complex flow channel structure needs to be set up inside the switching valve. Since the high-pressure cleaning machine basically does not need to consider the situation where the two liquids flow out after mixing when supplying liquid, the existing switching valve with mixing function has the disadvantages of high cost and impracticality for high-pressure cleaning machines. Utility Model Content

[0005] In order to solve the shortcomings and deficiencies in the above-mentioned prior art, the utility model provides a fluid switching valve, which satisfies the switching of fluid flow paths while simplifying the specific structure of the flow paths, which is conducive to reasonably simplifying the internal structure of the valve and reducing the production cost of the valve.

[0006] In order to achieve the above technical objectives, the utility model provides a fluid switching valve, the valve housing is provided with at least two inlets and one outlet, the valve core is provided with a docking inlet hole and a docking outlet hole which are connected to each other, the docking inlet hole can be selectively connected to one of the inlets, and the docking outlet hole is connected to the outlet, the valve core is rotatably arranged in the valve housing and can use its own central axis as the rotation center line, the inlets are circumferentially spaced around the central axis of the valve core, an annular flow channel is provided between the valve core and the valve housing, and the docking outlet hole is connected to the outlet through the annular flow channel.

[0007] Preferably, an elastic sealing joint and a butt spring acting on the sealing joint are provided in the butt inlet hole, the sealing joint is provided with a through hole connected to the butt inlet hole, and the spring pushes the sealing joint toward the inlet hole so that the butt inlet hole is sealed and connected to the inlet hole.

[0008] Preferably, the valve housing includes an annular side wall and a bottom wall which cooperate to form an accommodating cavity, the inlet is arranged on the bottom wall and at least two inlets are distributed circumferentially at intervals, the docking inlet hole extends axially from the bottom surface of the valve core in a direction away from the bottom wall, and the sealing joint is axially movable in the docking inlet hole.

[0009] Preferably, at least one annular sealing rib protruding outward is provided on the outer peripheral surface of the sealing joint; and / or the outer diameter of the sealing joint is larger than the inner diameter of the inlet.

[0010] Preferably, the fluid switching valve further comprises a valve cover, which is connected to the valve housing and limits the valve core in the accommodating cavity, and the valve core is connected to a gripping portion extending from the valve cover to the valve housing.

[0011] Preferably, a circle of annular groove is provided on the outer peripheral surface of the valve core, the docking hole is connected to the annular groove, and the annular flow channel is formed by the annular groove and the valve housing; and / or, sealing rings are provided on both axial sides of the annular flow channel between the valve core and the valve housing.

[0012] Preferably, the inner circumferential surface of the valve housing is provided with limit grooves corresponding to each inlet, the limit grooves and the annular flow channel are staggered in the axial direction, the valve core is provided with a concave hole, a limit member and a limit spring acting on the limit member are provided in the concave hole, the limit spring presses the limit member against the valve housing, and the limit member is embedded in the limit groove corresponding to the inlet when the valve core rotates to the docking inlet hole corresponding to one of the inlets.

[0013] Preferably, the valve housing is provided with an inlet pipe and an outlet pipe, the inlet pipe protrudes outwards and forms an inlet, and the outlet pipe protrudes outwards and forms an outlet.

[0014] The utility model also provides a high-pressure cleaning machine, including a water tank, a pump and a nozzle, the pump pumps the liquid in the water tank to the nozzle so that the liquid is sprayed out from the nozzle, the water tank is provided with at least two, the cleaning machine also includes the fluid switching valve recorded above, the number of inlets is not less than the number of water tanks, each water tank is connected to a different inlet, and the nozzle is connected to the outlet.

[0015] Preferably, the pump is arranged downstream of the fluid switching valve; and / or, the high-pressure cleaning machine further comprises a base, each water tank is detachably arranged on the base, and the pump and the fluid switching valve are arranged in the base.

[0016] After adopting the above technical solution, the utility model has the following advantages:

[0017] 1. The fluid switching valve provided by the utility model has a valve core that can be rotatably arranged in the valve housing and can use its own central axis as the rotation center line. A docking inlet and a docking outlet are provided on the valve core, and an annular flow channel is provided between the valve core and the valve housing. The docking outlet on the valve core is connected to the outlet on the valve housing through the annular flow channel. Multiple inlets on the valve housing are distributed circumferentially around the central axis of the valve core, that is, the distance between each inlet and the central axis of the valve core is consistent. When the valve core rotates to the docking inlet and is connected to any one of the inlets, the fluid flowing in from the inlet flows through the docking inlet and the docking outlet into the annular flow channel. Since the annular flow channel is annular, the fluid flowing into the annular flow channel can eventually flow to the outlet and flow out from the outlet. Reasonable improvement of the specific structure of the fluid switching valve can meet the switching of the fluid flow path while simplifying the structure of the flow path, which is conducive to reasonably simplifying the internal structure of the valve and reducing the production cost of the valve, so that the fluid switching valve can meet the functional requirements of the high-pressure cleaning machine while reasonably reducing the cost of the high-pressure cleaning machine.

[0018] 2. A sealing joint and a docking spring are arranged in the docking inlet. The docking spring pushes the sealing joint against the inlet. The inlet and the docking inlet can be sealed and connected through the cooperation of the docking spring and the sealing joint to avoid leakage of the fluid at the cooperation point between the docking inlet and the inlet. The fluid flowing in from the inlet can flow into the docking inlet through the through hole on the sealing joint.

[0019] 3. The inlet is preferably arranged on the bottom wall of the valve housing, and the end of the pipe section connected to the inlet is arranged roughly along the axial direction of the valve housing, so that the radial dimension of the structure when the fluid switching valve is connected to the pipeline can be appropriately reduced to avoid interference with the installation of other components. Correspondingly, the docking inlet hole extends axially, and the sealing joint can be axially movable in the docking inlet hole. The sealing joint abuts against the bottom wall of the valve housing to make the docking inlet hole and the inlet sealed and connected. The orientation of the inlet and the movable direction of the sealing joint are reasonably set, so that the contact surface between the sealing joint and the valve housing is a plane, which is conducive to improving the stability of the sealing joint to keep the docking inlet hole and the inlet sealed and connected.

[0020] 4. At least one annular sealing rib is arranged on the outer circumferential surface of the sealing joint. The annular sealing rib can reduce the contact area between the sealing joint and the butt-inlet hole while maintaining a circumferential sealing fit between the sealing joint and the butt-inlet hole to avoid fluid leakage. The sealing joint can also slide smoothly under the action of the butt spring to avoid the situation where the sealing joint cannot slide smoothly due to excessive friction caused by excessive contact area with the butt-inlet hole.

[0021] 5. The valve cover is connected to the valve housing and the valve core is limited in the accommodating cavity to ensure the structural stability of the valve core, thereby ensuring the matching stability of the docking inlet and the inlet and the connection stability of the docking outlet and the outlet. The valve core is provided with a gripping portion extending from the valve cover to the valve housing, and the user can rotate the valve core through the gripping portion to make the docking inlet on the valve core dock and connect with a certain inlet on the valve housing.

[0022] 6. The annular flow channel is formed by the annular groove on the outer peripheral surface of the valve core and the valve shell. The specific structure of the annular flow channel is reasonably set to reduce the difficulty of forming the valve core and the valve shell. The docking hole and the annular groove are both set on the valve core and the docking hole is connected with the annular groove, so the docking hole is naturally connected with the annular flow channel.

[0023] Sealing rings are arranged between the valve core and the valve housing on both axial sides of the annular flow channel, and the sealing rings are used to ensure the sealing of the annular flow channel to avoid fluid leakage in the annular flow channel.

[0024] 7. The inner circumference of the valve housing is provided with a limit groove corresponding to each inlet, and a concave hole is provided on the valve core. A limit piece and a limit spring are provided in the concave hole. The limit spring pushes the limit piece against the inner circumference of the valve housing. When the valve core rotates to the docking inlet corresponding to a certain inlet, the limit piece is inserted into the limit groove corresponding to the inlet under the resistance of the limit spring. The cooperation of the limit piece and the limit groove can remind the user that the valve core has rotated to the right position, so that the user can identify whether the valve core has rotated to the docking inlet and connected with a certain inlet. In addition, the cooperation of the limit piece and the limit groove can also limit the valve core circumferentially, avoiding the situation where the valve core rotates circumferentially during operation, resulting in circumferential misalignment between the docking inlet and the inlet, which is conducive to improving the docking stability of the docking inlet and the inlet.

[0025] 8. The high-pressure cleaning machine provided by the utility model includes a water tank, a pump, a nozzle and a fluid switching valve. The number of inlets on the fluid switching valve is not less than the number of water tanks. Each water tank is connected to a different inlet. Since more than two water tanks can be provided, each water tank can be used to hold different liquids. The user can switch the liquid supplied to the nozzle through the fluid switching valve according to the cleaning needs, which is conducive to improving the user experience. The flow path structure inside the fluid switching valve is simple, which can reasonably reduce the cost of the high-pressure cleaning machine while meeting the functional requirements of the high-pressure cleaning machine.

[0026] 9. The pump is preferably arranged downstream of the fluid switching valve, so that only one pump is required to pump the liquids in different water tanks to the nozzles through the fluid switching valve, thereby reducing the production cost of the cleaning machine.

[0027] The high-pressure cleaning machine also includes a base, and each water tank is detachably mounted on the base. A pump and a fluid switching valve are arranged in the base. The base enables the cleaning machine to form a modular structure, making the cleaning machine easy to store. The user can remove the water tank from the base to add liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of a fluid switching valve in Example 1;

[0029] Figure 2 is an axial cross-sectional view of the fluid switching valve of Example 1;

[0030] Figure 3 An exploded view of the fluid switching valve of Example 1;

[0031] Figure 4 This is a structural diagram of a valve housing in a fluid switching valve according to the first embodiment;

[0032] Figure 5 This is a structural diagram of a valve core in a fluid switching valve according to the first embodiment;

[0033] Figure 6 It is an axial cross-sectional view of a valve core in a fluid switching valve in Example 1;

[0034] Figure 7 Schematic diagram of a high pressure cleaning machine according to the first embodiment.

[0035] In the figure, 100-fluid switching valve, 110-valve housing, 111-inlet, 112-outlet, 113-annular side wall, 114-bottom wall, 115-accommodating chamber, 116-inflow pipe, 117-outflow pipe, 118-limiting groove, 120-valve core, 121-docking inlet hole, 122-docking outlet hole, 123-gripping portion, 124-core hole, 125-annular groove, 126-concave hole, 127-annular positioning groove, 130-annular flow channel, 140-valve cover, 141-avoidance hole, 150-sealing joint, 151-through hole, 152-annular sealing rib, 160-docking spring, 170-sealing ring, 180-limiting member, 190-limiting spring,

[0036] 200-water tank, 210-water valve,

[0037] 300-pump,

[0038] 400-Nozzle,

[0039] 500-base, 510-connector,

[0040] 600-battery pack. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following words indicating orientation or positional relationship such as "upper", "lower", "left", "right", "longitudinal", "lateral", "inner", "outer", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0042] Embodiment 1

[0043] Combination Figures 1 to 6 The fluid switching valve 100 provided in the first embodiment of the utility model comprises a valve housing 110 and a valve core 120 movably disposed in the valve housing 110. The valve housing 110 is provided with at least two inlets 111 and one outlet 112. The valve core 120 is provided with a docking inlet 121 and a docking outlet 122 that are connected to each other. The docking inlet 121 can be selectively connected to one of the inlets 111, and the docking outlet 112 is connected to the outlet 112. The valve core 120 is rotatably disposed in the valve housing 110 and can use its own central axis L1 as the rotation center line. The inlets 111 are spaced apart in the circumferential direction around the central axis L1 of the valve core 120. An annular flow channel 130 is provided between the valve core 120 and the valve housing 110, and the docking outlet 122 is connected to the outlet 112 through the annular flow channel 130.

[0044] When the valve core 120 rotates to the docking inlet 121 and docks with any inlet 111, the fluid flowing in from the inlet 111 flows into the annular flow channel 130 through the docking inlet 121 and the docking outlet 122. Since the annular flow channel 130 is annular, the fluid flowing into the annular flow channel 130 can eventually flow to the outlet 112 and flow out from the outlet 112. Reasonable improvement of the specific structure of the fluid switching valve 100 can meet the switching of the fluid flow path while simplifying the structure of the flow path, which is conducive to reasonably simplifying the internal structure of the valve and reducing the production cost of the valve, so that the fluid switching valve 100 can meet the functional requirements of the high-pressure cleaning machine while reasonably reducing the cost of the high-pressure cleaning machine.

[0045] Combination Figure 3 , Figure 4 In this embodiment, the valve housing 110 is generally in the shape of a hollow cylindrical shell, and the valve housing 110 includes an annular side wall 113 and a bottom wall 114. The bottom wall 114 is arranged at the bottom end of the annular side wall 113, and the annular side wall 113 and the bottom wall 114 enclose a receiving cavity 115 with an open top side. The inlet 111 is preferably arranged on the bottom wall 114 of the valve housing 110 and is distributed in a plurality of circumferential intervals. The outlet 112 is preferably arranged on the annular side wall 113 of the valve housing 110. The inlet 111 extends along the axial direction of the valve housing 110, and the outlet 112 extends along a certain radial direction of the valve housing 110. Specifically, the valve housing 110 is provided with an inlet pipe 116 extending axially downward from the bottom wall 114 and an outlet pipe 117 extending radially outward from the annular side wall 113. A plurality of inlet pipes 116 are distributed at circumferential intervals along the bottom wall 114. The hollow inner cavity of the inlet pipe 116 forms an inlet 111, and the hollow inner cavity of the outflow pipe 117 forms an outlet 112.

[0046] Combination Figure 5 , Figure 6 In this embodiment, the valve core 120 is disposed in the accommodating cavity 115, and the valve core 120 is connected to a gripping portion 123 extending out of the valve housing 110. Figure 1 , Figure 3The fluid switching valve 100 further includes a valve cover 140, which is connected to the valve housing 110 and limits the valve core 120 in the accommodating chamber 115, and the gripping portion 123 extends out of the valve housing 110 from the valve cover 140. Specifically, the valve cover 140 is detachably fixedly connected to the top of the annular side wall 113 by means of threaded fit or snap fit, and the valve core 120 is axially limited in the accommodating chamber 115 by the valve cover 140, and the central axes of the valve housing 110 and the valve core 120 are substantially coincident. A avoidance hole 141 is provided at the center of the valve cover 140, and the lower end of the gripping portion 123 passes through the avoidance hole 141 and is fixedly connected to the valve core 120. As a feasible solution of this embodiment, the gripping portion 123 and the valve core 120 can be separately formed and then fixed together by means of screws or the like. As a feasible solution of this embodiment, the gripping portion 123 can be set to a reasonable structure such as a "one" shaped knob or a "cross" shaped knob.

[0047] Combination Figure 2 , Figure 6 Since the inlets 111 are spaced around the central axis L1 of the valve core 120 in the circumferential direction, the distance between the center line of each inlet 111 and the central axis L1 of the valve core 120 is substantially the same. Since the inlet 111 is provided on the bottom wall 114 and extends along the axial direction of the valve housing 110, in order to smoothly connect the docking inlet 121 with the inlet 111, the docking inlet 121 extends from the bottom surface of the valve core 120 in the axial direction away from the bottom wall 114 to a certain depth, that is, the docking inlet 121 extends along the axial direction of the valve core 120, and the docking inlet 121 is arranged away from the central axis L1 of the valve core 120, and the distance between the center line L2 of the docking inlet 121 and the central axis L1 of the valve core 120 is substantially equal to the distance between the center line of each inlet 111 and the central axis of the valve housing 110, so that the valve core 120 rotating around its own central axis L1 can connect the docking inlet 121 with any inlet 111. In this embodiment, the valve core 120 is provided with a core hole 124, which is independently arranged relative to the docking inlet hole 121 and the docking outlet hole 122. When the valve core 120 rotates to the docking inlet hole 121 to be docked and connected with a certain inlet, the core hole 124 is separated from the inlet, so as to prevent the fluid flowing from the inlet 111 through the docking inlet hole 121 and the docking outlet hole 122 to the outlet 112 from flowing into the core hole 124. The core hole 124 can reduce the material of the valve core 120. Of course, the setting of the core hole 124 can also be eliminated.

[0048] In order to prevent fluid leakage at the fitting point between the docking inlet 121 and the inlet 111, an elastic sealing joint 150 and a docking spring 160 acting on the sealing joint 150 are provided in the docking inlet 121. The sealing joint 150 is hollow columnar and is provided with a through hole 151 connected to the docking inlet 121. The docking spring 160 pushes the sealing joint 150 against the inlet 111 so that the docking inlet 121 and the inlet 111 are sealed and connected. Specifically, the sealing joint 150 is arranged in the lower end of the docking inlet 121 and can slide up and down in the axial direction in the docking inlet 121. The docking spring 160 is arranged in the upper end of the docking inlet 121. The upper end of the docking spring 160 abuts against the inner top wall of the docking inlet 121 to achieve positioning. The lower end of the docking spring 160 abuts against the sealing joint 150 to achieve contact with the sealing joint 150. The docking spring 160 is in a compressed state and applies a downward pre-tightening force to the sealing joint 150. Under the pre-tightening force of the docking spring 160, the bottom surface of the sealing joint 150 is tightly pressed against the bottom wall 114 of the valve housing 110. The contact surface between the sealing joint 150 and the valve housing 110 is a plane, which can ensure the stability of the axial sealing connection between the lower end of the docking inlet 121 and the upper end of the inlet 111. As a feasible solution of this embodiment, the sealing joint 150 can be made of elastic materials such as silicone or rubber.

[0049] In this embodiment, the outer diameter D1 of the sealing joint 150 is larger than the inner diameter D2 of the inlet 111, so as to ensure the contact area between the sealing joint 150 and the bottom wall 114, thereby further ensuring the stability of the axial sealing connection between the lower end of the butt-jointed inlet hole 121 and the upper end of the inlet 111. Specifically, the difference between the outer diameter D1 of the sealing joint 150 and the inner diameter D2 of the inlet 111 can be set to a reasonable size such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0050] In the present embodiment, in order to reduce the contact area between the sealing joint 150 and the docking inlet 121 while maintaining a circumferential sealing fit between the sealing joint 150 and the docking inlet 121, at least one annular sealing rib 152 protruding outward is provided on the outer circumferential surface of the sealing joint 150, and the annular sealing rib 152 is tightly against the inner wall of the docking inlet 121. The annular sealing rib 152 realizes a circumferential sealing fit between the outer circumferential surface of the sealing joint 150 and the hole wall of the docking inlet 121, thereby preventing the fluid flowing into the docking inlet 121 from leaking from the gap between the sealing joint 150 and the docking inlet 121. The outer circumferential surface of the sealing joint 150 except the annular sealing rib 152 may not contact the hole wall of the docking hole 121, the contact area between the sealing joint 150 and the docking hole 121 is greatly reduced, and the friction force when the sealing joint 150 slides axially relative to the docking hole 121 is greatly reduced, so that the sealing joint 150 can smoothly slide axially under the elastic force of the docking spring 160 so that the bottom surface of the sealing joint 150 can be pressed against the bottom wall 114 in time.

[0051] Combination Figure 6 In this embodiment, a circle of annular grooves 125 are provided on the outer circumferential surface of the valve core 120, and the docking outlet 122 extends along a certain radial direction of the valve core 120. The center line L2 of the docking inlet 121 and the center line L3 of the docking outlet 122 are preferably located on the same center plane passing through the center axis L1 of the valve core 120. The end of the docking outlet 122 facing the center of the valve core 120 is directly connected to the upper end of the docking outlet 122, and the end of the docking outlet 122 facing away from the center of the valve core 120 is directly connected to the annular groove 125. The annular flow channel 130 is formed by the annular groove 125 and the annular side wall 113 of the valve housing 110, and the end of the outlet 112 facing the center of the valve housing 110 is directly connected to the annular flow channel 130. Preferably, the docking outlet 122, the annular flow channel 130 and the outlet 112 are approximately located at the same position in the axial direction. As a feasible solution of this embodiment, the plane where the annular groove 125 is located can be set perpendicular to the central axis L1 of the valve core 120, or can be set obliquely relative to the central axis L1 of the valve core 120, so that the annular groove 125 can be set around the outer peripheral surface of the valve core 120. As an alternative to this embodiment, the docking outlet 122 and the annular groove 125 can also be staggered in the axial direction. In this case, a connecting groove for connecting the docking outlet 122 and the annular groove 125 can be set on the outer peripheral surface of the valve core 120. As an alternative to this embodiment, the center line L2 of the docking inlet 121 and the center line L3 of the docking outlet 122 can also be located on different center planes passing through the central axis L1 of the valve core 120. In this case, a connecting hole for connecting the docking inlet 121 and the docking outlet 122 is set in the valve core 120.

[0052] In this embodiment, the outer diameter of the valve core 120 is slightly smaller than the inner diameter of the accommodating chamber 115. In order to prevent the fluid from leaking out of the annular flow channel 130, a sealing ring 170 is provided between the valve core 120 and the valve housing 110 on both axial sides of the annular flow channel 130. Specifically, two annular positioning grooves 127 are provided on the outer circumferential surface of the valve core 120, which are respectively located on the upper and lower sides of the annular groove 125 in the axial direction. The sealing ring 170 is sleeved on the outer circumference of the valve core 120 and embedded in the annular positioning groove 127. The sealing ring 170 is tightly against the inner circumferential surface of the annular side wall 113. The sealing ring 170 realizes the sealing cooperation between the valve core 120 and the annular side wall 113 in the circumferential direction, so as to prevent the fluid in the annular flow channel 130 from leaking out from the gap between the valve core 120 and the annular side wall 113.

[0053] Combination Figure 4 In this embodiment, a limiting groove 118 corresponding to each inlet 111 is provided on the inner circumferential surface of the annular side wall 113, and the limiting groove 118 and the annular flow channel 130 are staggered in the axial direction. A concave hole 126 is provided on the valve core 120, and a limiting member 180 and a limiting spring 190 acting on the limiting member 180 are provided in the concave hole 126. The limiting spring 190 pushes the limiting member 180 against the valve housing 110. When the valve core 120 rotates to the docking inlet 121 corresponding to one of the inlets 111, the limiting member 180 is embedded in the limiting groove 118 corresponding to the inlet 111. Specifically, each limit groove 118 and the corresponding inlet 111 are located in the same radial direction of the valve housing 110, and the recessed hole 126 extends from the outer peripheral surface of the valve core 120 along a certain radial direction toward the center of the valve core 120 to a certain depth. The limit member 180 is arranged at the end of the limit spring 190 facing away from the center of the valve core 120, and one end of the limit spring 190 is in contact with the hole wall of the recessed hole 126 to achieve a positioning setting, and the other end of the limit spring 190 is in contact with the limit member 180 to achieve contact with the limit member 180. The limit spring 190 is in a compressed state and applies a force to the limit member 180 away from the center of the valve core 120. When the valve core 120 rotates to the docking inlet 121 corresponding to a certain inlet 111, the limiter 180 is embedded in the limiter groove 118 corresponding to the inlet 111 under the resistance of the limiter spring 190. The cooperation between the limiter 180 and the limiter groove 118 can remind the user that the valve core 120 has rotated to the right position, so that the user can identify whether the valve core 120 has rotated to the docking inlet 121 and a certain inlet 111. In addition, the cooperation between the limiter 180 and the limiter groove 118 can also limit the valve core 120 circumferentially, avoiding the situation that the valve core 120 rotates circumferentially during operation, resulting in circumferential misalignment between the docking inlet 121 and the inlet 111, which is conducive to improving the docking stability of the docking inlet 121 and the inlet 111. As a feasible solution of this embodiment, the limiter 180 can be set to a reasonable shape such as a sphere, a column, a cone, etc. As a preferred solution of this embodiment, the limiting groove 118 is preferably provided at the upper end of the inner circumferential surface of the annular side wall 113 .

[0054] Combination Figure 7 The present embodiment also provides a high-pressure cleaning machine, including a water tank 200, a pump 300, a nozzle 400 and the fluid switching valve 100 described above, wherein the water tank 200 is provided with at least two, the number of inlets 111 is not less than the number of water tanks 200, each water tank 200 is connected to a different inlet 111, and the nozzle 400 is connected to the outlet 112 of the fluid switching valve 100. The pump 300 can pump the liquid in any water tank 200 to the nozzle 400, so that the liquid is sprayed out from the nozzle 400. Since more than two water tanks 200 can be provided, each water tank 200 can be used to hold different liquids, and the user can switch the liquid supplied to the nozzle 400 through the fluid switching valve 100 according to the cleaning needs, which is conducive to improving the user experience. The flow path structure inside the fluid switching valve 100 is simple, which can reasonably reduce the cost of the high-pressure cleaning machine while meeting the functional requirements of the high-pressure cleaning machine.

[0055] In this embodiment, there are two water tanks 200, one of which can be used to hold soap liquid, and the other can be used to hold clean water. Correspondingly, the fluid switching valve 100 is provided with two inlets 111, and the two inlets 111 can be connected to the two water tanks 200 respectively. Specifically, the high-pressure cleaning machine of this embodiment also includes a base 500, and the two water tanks 200 are detachably fixedly installed on the base 500 through a snap-on structure or other structures. The bottom side of the water tank 200 is provided with a water valve 210 that can be opened and closed, and the top side of the base 500 is provided with a joint 510 corresponding to the water valve 210. When the water tank 200 is installed on the base 500, the water valve 210 cooperates with the joint 510, and the water valve 210 is switched to the open state under the abutment of the joint 510. When the water tank 200 is detached from the base 500 to separate the water valve 210 from the joint 510, the water valve 210 is switched to the closed state.

[0056] In order to reasonably reduce the component cost, the pump 300 is preferably arranged downstream of the fluid switching valve 100, so that only one pump 300 is required to pump the liquids in different water tanks 200 to the nozzle 400 through the fluid switching valve 100. Specifically, each connector 510 is connected to the corresponding inlet 111 of the fluid switching valve 100 through a hose, the outlet 112 of the fluid switching valve 100 is connected to the pump inlet of the pump 300 through a hose, and the pump outlet of the pump 300 is connected to the nozzle 400 through a hose.

[0057] In order to facilitate the user to switch the liquid supplied to the nozzle 400, the gripping portion 123 connected to the valve core 120 in the fluid switching valve 100 is exposed on the base 500. The pump 300 and the fluid switching valve 100 are arranged in the base 500, and a battery pack 600 is also arranged in the base 500, and the battery pack 600 is used to supply power to the pump 300 and other electrical devices.

[0058] When it is necessary to use the liquid in a water tank 200, the user can rotate the valve core 120 through the grip 123 to connect the docking inlet hole 121 on the valve core 120 with the inlet 111 corresponding to the water tank 200. The liquid in the water tank 200 flows to the inlet 111 through the pipeline structure under the pumping action of the pump 300. The liquid flowing into the inlet 111 flows into the annular flow channel 130 through the through hole 151, the docking inlet hole 121 and the docking outlet hole 122. The liquid flowing into the annular flow channel 130 flows out of the fluid switching valve 100 through the outlet 112 and flows to the nozzle 400 through the pump 300. The liquid flowing to the nozzle 400 is sprayed onto the object to be cleaned.

[0059] It can be understood that the fluid switching valve 100 of this embodiment is also applicable to other electric tools with fluid supply functions.

[0060] It can be understood that the inlet 111 of the fluid switching valve 100 can be set to a reasonable number such as two, three, or four.

[0061] It is understandable that the inlet 111 of the fluid switching valve 100 may also be provided on the annular side wall 113 of the valve housing 110 . In this case, the docking inlet hole 121 extends along a certain radial direction of the valve core 120 .

[0062] It can be understood that the fluid switching valve 100 of this embodiment can be used to switch the flow path of fluids such as liquid, gas, or a gas-liquid mixture.

[0063] It is understandable that the number of water tanks 200 in the high-pressure cleaning machine can also be set to three, four or other reasonable numbers according to cleaning needs. Correspondingly, the number of inlets 111 on the fluid switching valve 100 is determined according to the number of water tanks 200. The number of inlets 111 can be consistent with the number of water tanks 200, or the number of inlets 111 can be more than the number of water tanks 200.

[0064] It is understandable that the pump 300 in the high-pressure cleaning machine can be a plunger pump, a diaphragm pump, or other pump that meets the pumping requirements.

[0065] It is understandable that the high-pressure cleaning machine of this embodiment can also be configured to be powered by connecting an electric wire to the mains.

[0066] In addition to the above preferred embodiments, the present invention has other implementation modes. Those skilled in the art can make various changes and modifications based on the present invention. As long as they do not deviate from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

1. A fluid switching valve, comprising a valve housing and a valve core movably arranged in the valve housing, the valve housing being provided with at least two inlets and one outlet, the valve core being provided with a docking inlet hole and a docking outlet hole communicating with each other, the docking inlet hole being selectively communicated with one of the inlets, and the docking outlet hole being communicated with the outlet, characterized in that: The valve core is rotatably arranged in the valve housing and can use its own central axis as the rotation center line. The inlets are distributed circumferentially around the central axis of the valve core. An annular flow channel is provided between the valve core and the valve housing, and the docking outlet is connected to the outlet through the annular flow channel.

2. The fluid switching valve according to claim 1, characterized in that: The butt-joint inlet hole is provided with an elastic sealing joint and a butt-joint spring acting on the sealing joint, the sealing joint is provided with a through hole connected with the butt-joint inlet hole, and the spring pushes the sealing joint toward the inlet hole so that the butt-joint inlet hole is connected with the inlet hole in a sealed manner.

3. The fluid switching valve according to claim 2, characterized in that: The valve housing includes an annular side wall and a bottom wall that cooperate to form an accommodating cavity. The inlet is arranged on the bottom wall and is distributed at least two circumferentially at intervals. The docking inlet hole extends axially from the bottom surface of the valve core in a direction away from the bottom wall. The sealing joint is axially movable in the docking inlet hole.

4. The fluid switching valve according to claim 2, characterized in that: At least one annular sealing rib protruding outward is provided on the outer peripheral surface of the sealing joint; and / or the outer diameter of the sealing joint is larger than the inner diameter of the inlet.

5. The fluid switching valve according to claim 3, characterized in that: The fluid switching valve further comprises a valve cover, which is connected to the valve housing and limits the valve core in the accommodating cavity, and the valve core is connected to a gripping portion extending from the valve cover to the valve housing.

6. The fluid switching valve according to claim 1, characterized in that: A circle of annular groove is provided on the outer peripheral surface of the valve core, the docking hole is connected to the annular groove, and the annular flow channel is formed by the annular groove and the valve housing; and / or, sealing rings are provided on both axial sides of the annular flow channel between the valve core and the valve housing.

7. The fluid switching valve according to claim 1, characterized in that: The inner circumferential surface of the valve housing is provided with limit grooves corresponding to each inlet, the limit grooves and the annular flow channel are staggered in the axial direction, the valve core is provided with a concave hole, a limit piece and a limit spring acting on the limit piece are provided in the concave hole, the limit spring pushes the limit piece against the valve housing, and the limit piece is embedded in the limit groove corresponding to the inlet when the valve core rotates to the docking inlet corresponding to one of the inlets.

8. The fluid switching valve according to claim 1, characterized in that: The valve housing is provided with an inlet pipe and an outlet pipe. The inlet pipe protrudes outwards and forms an inlet, and the outlet pipe protrudes outwards and forms an outlet.

9. A high-pressure cleaning machine, comprising a water tank, a pump and a nozzle, wherein the pump pumps liquid in the water tank to the nozzle so that the liquid is sprayed out from the nozzle, characterized in that: There are at least two water tanks, and the cleaning machine also includes the fluid switching valve described in any one of claims 1 to 8, the number of inlets is not less than the number of water tanks, each water tank is connected to a different inlet, and the nozzle is connected to the outlet.

10. The high pressure cleaning machine according to claim 9, characterized in that: The pump is arranged downstream of the fluid switching valve; and / or, the high-pressure cleaning machine further comprises a base, each water tank is detachably arranged on the base, and the pump and the fluid switching valve are arranged in the base.

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