Cleaning machine head, high-pressure cleaning machine and plunger pump

Abstract

The present invention discloses a cleaning machine head, a high-pressure cleaning machine and a plunger pump. The cleaning machine head guides the plunger by arranging a guide sleeve, which can effectively shorten the length of the pressurizing chamber, which is beneficial to reducing the size of the pump body. Also, the sealing plunger and the first sealing ring of the pump body can be arranged at the outer end of the pressurizing chamber for easy installation and replacement after wear. Moreover, there is no wear between the plunger and the pump body, which extends the service life of the pump body. In combination with the design of the central hole of the guide sleeve, on the one hand, it can effectively reduce the contact area between the plunger and the guide sleeve to reduce the heat generated by friction and the wear of parts. On the other hand, the groove at the hole wall of the central hole of the plunger can also serve as a discharge channel to achieve the discharge of high temperature and high pressure, avoiding the influence of the heat generated during operation on the parts, and being beneficial to extending the service life of the plunger, the guide sleeve and the sealing ring.

Description

Technical Field

[0001] The present invention relates to the field of cleaning machines, in particular to a cleaning machine head, a high-pressure cleaning machine, and a plunger pump. Background Art

[0002] A high-pressure cleaning machine is a machine that uses a power device to drive a plunger pump to generate pressurized water to wash the surface of an object. It can peel off and wash away dirt to achieve the purpose of cleaning the surface of the object. Compared with the traditional manual cleaning method, the high-pressure cleaning machine reduces water consumption, saves a lot of time, and has a good cleaning effect. Nowadays, high-pressure cleaning machines are more and more widely used in various fields of life such as cleaning cars, courtyards, roads, fences, etc.

[0003] Conventional high-pressure cleaning machines include a plunger pump and a driving mechanism that drives the plunger of the plunger pump to reciprocate. Specifically, the structure disclosed in the application number 201620224471.5 is like this. In this structure, in order to effectively guide the plunger, the length of the cavity in the pump body for the plunger to stretch is relatively long, thus causing the size of the pump body to be relatively large; due to the increase in the cavity length, in order to ensure sufficient pressure is formed, the sealing ring for sealing the plunger and the cavity needs to be set at a relatively deep position in the cavity, which increases the difficulty of installing, disassembling, and replacing the sealing ring.

[0004] In addition, the length of the part of the plunger located in the cavity is not less than half of the length of the plunger. The contact area between the plunger and the cavity is relatively large, increasing the wear between the plunger and the pump body and generating more heat that is not easily released. And after the pump body is worn, it needs to be replaced as a whole. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art, and provide a cleaning machine head, a high-pressure cleaning machine, and a plunger pump.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A cleaning machine head includes a plunger pump and a transmission assembly. The plunger pump includes a pump body and a plunger that can stretch in its boosting cavity. The plunger is sealed with the boosting cavity through a first sealing ring. The plunger is movably arranged in the central hole of a guide sleeve connected to the pump body. The length of the plunger is greater than the length of the guide sleeve. The central hole enables the plunger not to contact the cavity wall of the boosting cavity where it is located; a group of grooves extending inward from its end are formed at the hole wall of the central hole so that the contact area between the part of the plunger located in the guide sleeve and the hole wall of the central hole is smaller than the area of the outer peripheral surface of the part of the plunger located in the guide sleeve.

[0008] Preferably, in the cleaning machine head described above, the groove is a through groove extending from one end of the central hole to the other end, and the cross-sectional shape of the central hole is gear-shaped.

[0009] Preferably, in the cleaning machine head, a heat dissipation plate is provided between the guide sleeve and the pump body. The first sealing ring is limited in the limiting groove formed by the heat dissipation plate and the pump body. A heat dissipation channel is formed on the end face of the heat dissipation plate, extending from the through hole on the heat dissipation plate for the plunger to pass through to the edge of the heat dissipation plate.

[0010] Preferably, in the cleaning machine head, there are three plungers which are distributed in a triangular shape. One heat dissipation element is provided at one end of the pump body facing the guide sleeve. The heat dissipation element has perforations for each plunger to pass through. Heat dissipation channels extending from each perforation to the edge of the heat dissipation element and a Y-shaped heat dissipation groove connecting the three perforations are formed at the end face of the heat dissipation element.

[0011] Preferably, in the cleaning machine head, the guide sleeve includes a coaxial first pipe section and a second pipe section. The outer diameter of the second pipe section is larger than that of the first pipe section. The guide sleeve and the heat dissipation element are pressed against the end of the pump body through a connecting member connected to the pump body.

[0012] Preferably, in the cleaning machine head, the connecting member further includes a positioning sleeve matching the cylinder forming the boosting chamber. Notches communicating with each heat dissipation channel are formed on the positioning sleeve.

[0013] Preferably, in the cleaning machine head, the pump body includes a first member and a second member. An inlet and an outlet perpendicular to each other are formed on the first member. The first member and the second member are combined to form an annular cavity;

[0014] A first channel communicating the inlet and the annular cavity is formed on the first member;

[0015] A discharge chamber communicating with the outlet, at least two boosting chambers, a second channel communicating each boosting chamber and the annular cavity, and a third channel connecting each boosting chamber and the discharge chamber are formed on the second member; a first one-way valve allowing fluid to enter the boosting chamber from the annular cavity is provided in the second channel; a second one-way valve allowing fluid to enter the discharge chamber from the boosting chamber is provided in the third channel.

[0016] Preferably, in the cleaning machine head, a rod joint coaxial with and communicating with the inlet is formed on the first member. A pop-up spring is coaxially arranged in the rod joint.

[0017] A high-pressure cleaning machine includes the cleaning machine head as described in any one of the above and a motor for driving the cleaning machine head to work.

[0018] Preferably, in the high-pressure washer, the motor is movably connected to the transmission assembly. The transmission assembly is located in the first housing, and the motor is located in the main machine housing. The first housing is detachably connected to the main machine housing.

[0019] A plunger pump, including a pump body and a plunger that can expand and contract in its pressurizing chamber. The plunger is sealed with the pressurizing chamber through a first sealing ring. The plunger is movably arranged in the central hole of a guide sleeve connected to the pump body. The length of the plunger is greater than the length of the guide sleeve, and the central hole enables the plunger not to contact the wall of the pressurizing chamber where it is located; a group of grooves extending inward from its end are formed at the hole wall of the central hole so that the contact area between the part of the plunger located in the guide sleeve and the hole wall of the central hole is smaller than the area of the outer peripheral surface of the part of the plunger located in the guide sleeve.

[0020] The advantages of the technical solution of the present invention are mainly reflected in:

[0021] In this solution, by arranging a guide sleeve to guide the plunger, the length of the pressurizing chamber can be effectively shortened, which is beneficial to reducing the size of the pump body. At the same time, the first sealing ring for sealing the plunger and the pump body can be arranged at the outer end of the pressurizing chamber for easy installation and replacement after wear. Moreover, there is no wear between the plunger and the pump body, which extends the service life of the pump body; combined with the design of the central hole of the guide sleeve, on the one hand, the contact area between the plunger and the guide sleeve can be effectively reduced to reduce the heat generated by friction and the wear of parts. On the other hand, the grooves at the hole wall of the plunger and the central hole can also serve as a discharge channel to achieve the discharge of high temperature and high pressure, avoiding the influence of the heat generated during work on the parts, and being beneficial to extending the service life of the plunger, guide sleeve and sealing ring.

[0022] In this solution, a heat dissipation plate is arranged between the guide sleeve and the pump body, which can cooperate with the guide sleeve and the pump body to limit the two sealing rings, avoid the axial movement of the sealing rings, and ensure the sealing performance; at the same time, the heat dissipation channels on the heat dissipation plate can effectively release the heat generated by friction, avoiding the heat from accumulating in the space formed by the heat dissipation plate, the guide sleeve and the pump body and affecting the performance of the sealing ring.

[0023] In this solution, multiple plungers share one heat dissipation element, and a Y-shaped heat dissipation groove is also arranged between the three through holes of the heat dissipation element, increasing the heat dissipation path.

[0024] In this solution, through the design of the shape of the guide sleeve, and by using a connecting piece connected to the pump body to fixedly connect and position the three guide sleeves to the pump body, the position accuracy of the three guide sleeves can be effectively guaranteed. At the same time, the positioning sleeve on the connecting piece cooperates with the cylinder on the pump body, which can effectively ensure the position accuracy between the pump body and the connecting piece, avoid the shear force on the long bolts connecting the pump body and the connecting piece, and ensure the stability of the connection. The positioning sleeve can also position the heat dissipation element to prevent the hole wall of the perforation on it from contacting the plunger due to its position deviation; and the notch formed on the positioning sleeve facing the heat dissipation channel on the heat dissipation plate enables the heat inside the positioning sleeve to be effectively released to the outside of the heat dissipation sleeve, avoiding the influence of frictional high temperature on the performance of the components.

[0025] In this solution, a rod joint is provided at the front end of the outlet of the pump body, which can effectively adapt to the connection requirements of different spray rods, and a spring is provided inside the rod joint, which can effectively make the spray rod automatically decouple from the rod joint when unlocking the connection between the spray rod and the rod joint, facilitating the disassembly operation.

[0026] The drive mechanism of this solution adopts a split structure. The transmission component and the plunger pump are assembled on the cleaning machine head. The drive main body and the transmission component adopt a structure that can be quickly separated and connected, which is convenient for handling and transportation, and an existing main body of a knob-type multi-head tool can be used, which is beneficial to reducing the usage burden of the user.

[0027] For the drive main body of this solution, by setting matching arc-shaped barrel holes and limit hooks on the knob and the fixing block, the knob and the fixing block can be effectively assembled into a whole, which is convenient for installation and at the same time beneficial to ensuring the stability of the structure. And an arc-shaped groove for accommodating the return spring is formed on the knob, and a limit boss embedded in the arc-shaped groove is formed on the fixing block, which can effectively compress the return spring to make the return spring play a role. Combined with the shielding part on the fixing block, the return spring can be effectively restricted to prevent the return spring from exiting the arc-shaped groove, and the integrity and stability of the structure are better, and it is easier to disassemble and assemble. Brief Description of the Drawings

[0028] Figure 1 is a cross-sectional view of the cleaning machine head of the present invention;

[0029] Figure 2 is a perspective view of the cleaning machine head of the present invention with the connecting piece hidden;

[0030] Figure 3 is Figure 1 an enlarged view of area A in

[0031] Figure 4 is a perspective view of the guide sleeve in the present invention;

[0032] Figure 5 is a perspective view of the heat dissipation element in the present invention;

[0033] Figure 6 is a perspective view of the cleaning machine head with a connector of the present invention;

[0034] Figure 7 is a perspective view of the connector in the present invention, and only the notch on one positioning sleeve is shown in the figure;

[0035] Figure 8 is a front view of the separated state of the cleaning machine head and the driving main machine of the high-pressure cleaning machine of the present invention;

[0036] Figure 9 is a sectional view of the separated state of the cleaning machine head and the driving main machine of the high-pressure cleaning machine of the present invention;

[0037] Figure 10 is Figure 1 an enlarged view of area B in;

[0038] Figure 11 is a perspective view of the driving main machine in the present invention, and the left half of the main machine housing is hidden in the figure;

[0039] Figure 12 is a perspective view of the knob and the fixing block connected as a whole in the present invention;

[0040] Figure 13 is a perspective view of the knob in the present invention;

[0041] Figure 14 is a schematic diagram of the positional relationship between the blocking block and the fixing block in the present invention;

[0042] Figure 15 is a perspective view of the fixing block in the present invention;

[0043] Figure 16 is a sectional view of the driving main machine of the present invention, and the left half of the main machine housing is hidden in the figure. Detailed implementation manners

[0044] The purpose, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of applying the technical solutions of the present invention, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

[0045] In the description of the solution, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. And, in the description of the solution, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0046] The plunger pump disclosed by the present invention will be described below with reference to the drawings. As shown in the attached Figure 1 and attached Figure 2 figures, the plunger pump includes a pump body 100 and a plunger 200. The plunger 200 is reciprocally telescopically arranged on the pump body 100 along its axis. By the reciprocating telescoping of the plunger 200, the volume of the sealed working cavity in the pump body 100 changes to achieve the suction and discharge of fluid.

[0047] The pump body 100 can adopt the pump body structures of various known plunger pumps. As shown in the attached Figure 1 and attached Figure 2 figures, the pump body 100 of this solution includes a first member 110 and a second member 120. The first member 110 and the second member 120 are combined to form an annular cavity 130.

[0048] As shown in the attached Figure 1 figure, an inlet 111 and an outlet 112 are formed on the first member 110. The axes of the inlet 111 and the outlet 112 are perpendicular. The axis of the outlet 112 is parallel or coaxial with the axis of the annular cavity 130. A first channel 113 communicating the inlet 111 and the annular cavity 130 is also formed on the first member 110. The axis of the first channel 113 is perpendicular to the axis of the inlet 111 and parallel to the axis of the outlet 112.

[0049] As shown in the attached Figure 1As shown, a discharge chamber 121 communicating with the outlet 112, at least two pressurizing chambers 122, a second passage 123 communicating each pressurizing chamber 122 with the annular chamber 130, and a third passage 124 connecting each pressurizing chamber 122 with the discharge chamber 121 are formed on the second member 120; the discharge chamber 121 is coaxial with the annular chamber 130 and located at the central position of the annular chamber. The axes of the second passage 123, the third passage 124, and the pressurizing chambers 122 are parallel. At the same time, the outlet of each second passage 123 and the inlet of the third passage 124 are opposite to approximately half of the cross-sectional area of a pressurizing chamber 122. A first one-way valve 300 allowing fluid to enter the pressurizing chamber from the annular chamber is arranged in the second passage 123; a second one-way valve 400 allowing fluid to enter the discharge chamber from the pressurizing chamber is arranged in the third passage. A third one-way valve is arranged in the space formed by the discharge chamber 121 and the outlet 112.

[0050] During operation, fluid enters the annular chamber 130 from the inlet 111 through the first passage 113. When each plunger moves outward from the pressurizing chamber, the fluid in the annular chamber 130 enters the pressurizing chamber 122 through the second passage 123; when the plunger moves into the pressurizing chamber, the fluid in the pressurizing chamber is compressed, and the pressurized fluid is discharged through the third passage 124 and the discharge chamber 121 from the outlet 112 to achieve pressurization.

[0051] As shown in the attached Figure 1 As shown, in order to facilitate the connection to an external pipeline, a pipe joint 140 is coaxially inserted at the inlet 111. In addition, in order to facilitate the connection to different spray bars (not shown in the figure), a rod joint 125 is further formed on the second member 120 in front of the outlet 121. The rod joint 125 includes a receiving portion 1251 and a connecting portion 1252. The receiving portion 1251 is coaxial with the outlet 121, and a pop-up spring 150 is fixedly arranged in its inner cavity. The connecting portion 1252 can adopt various known structures and is not limited herein. When the spray bar is connected to the connecting portion 1252, the pop-up spring 150 is compressed. When the spray bar is unlocked from the connecting portion 1252, the reaction force of the pop-up spring 150 can make it easier for the spray bar to disengage from the rod joint 125.

[0052] The number of the pressurizing chambers 122 can be designed as required. For example, it can have only one, or can be multiple. As shown in the attached Figure 2 As shown, the number of the pressurizing chambers is 2 - 5, more preferably 3, and they are distributed in an equilateral triangle. When three pressurizing chambers 122 are adopted, the product can obtain the best pressurizing effect under the condition of the smallest possible volume.

[0053] As shown in the attached Figure 1 and the attached Figure 2As shown, there are 3 plungers 200, and each plunger 220 is arranged in a supercharging chamber 122. At the same time, as shown in the appendix Figure 3 As shown, a first sealing ring 500 for hermetically sleeving the outer periphery of each plunger 220 and hermetically connecting the plunger 220 to the supercharging chamber is provided. The first sealing ring 500 is located in the large-diameter section 126 of the cylinder 127 forming the supercharging chamber and is fixed in position. At the same time, the first sealing ring 500 makes the outer peripheral surface of the plunger 220 not contact the inner wall of the supercharging chamber 122.

[0054] As shown in the appendix Figure 2 , appendix Figure 3 As shown, in order to reduce the size of the second member 120, the length of the supercharging chamber 122 is about 1 / 3 of the length of the plunger 200. At this time, in order to better guide the part of the plunger 200 outside the supercharging chamber, each plunger 200 is inserted into the central hole 610 of a guide sleeve 600. One end of the guide sleeve 600 is connected to the end face of the second member 120, and the two can be fixedly connected or abutted.

[0055] As shown in the appendix Figure 3 As shown, the length of the guide sleeve 600 is less than the length of the plunger 200. Preferably, the length of the guide sleeve 600 is about half of the length of the plunger 200, and the contact area between the plunger 200 and the hole wall of the central hole 610 is less than the area of the outer peripheral surface 210 of the part of the plunger 200 located inside the guide sleeve.

[0056] As shown in the appendix Figure 2 -appendix Figure 4 As shown, the plunger 200 is cylindrical, and the central hole 610 is a gear-shaped hole, that is, the central hole 610 is obtained by forming a set of equally divided circumferential through slots 611 on the hole wall of a round hole. Thus, only the surface of the convex part 612 between adjacent through slots 611 facing the center of the central hole contacts the outer peripheral surface of the plunger 200. By making only part of the area of the outer peripheral surface 210 of the part of the plunger 200 located inside the central hole contact the hole wall of the central hole, the friction between the plunger 200 and the guide sleeve 600 can be effectively reduced. On the one hand, the generation of heat can be effectively reduced, and at the same time, the wear can be effectively reduced and the service life can be prolonged. In addition, the through slots 611 can be used as heat dissipation channels, so as to realize the release of heat and pressure between the plunger and the guide sleeve.

[0057] Of course, the through slots 611 may not be through slots extending to both ends of the central hole 610, but only extend to one end, and the slots do not equally divide the circumference of the central hole; at the same time, in addition to the gear-shaped hole, the central hole 610 may also adopt other shapes. For example, the central hole may be an oval hole, a triangular hole, a polygonal hole, etc. Or, the plunger 200 may not be cylindrical, but prismatic.

[0058] As shown in the attached Figure 3 and attached Figure 4 figures, in order to facilitate the connection of the guide sleeve 600 to the second component, the guide sleeve 600 includes a coaxial first pipe section 620 and a second pipe section 630. The outer diameter of the second pipe section 630 is greater than that of the first pipe section 620, and the second pipe section 630 abuts against the second component. A spring 700 for driving the plunger to move back to the outside of the pressure increasing chamber 122 is sleeved on the outer periphery of the first pipe section 620 and one end abuts against the second pipe section 630, and the other end of the spring 700 abuts against a stop disk 220 at the outer end of the plunger 200. Since the plunger 200 can rotate relative to the guide sleeve during its telescopic process, to a certain extent, the plunger 200 can change the contact position with the convex portion 612 of the central hole of the guide sleeve, which is beneficial to extending the service life of the plunger.

[0059] As shown in the attached Figure 3 and attached Figure 4 figures, the central hole of the second pipe section 630 is a round hole 632 with a diameter greater than the maximum width of the gear-shaped hole of the first pipe section. A second sealing ring 800 with a fixed position is arranged at the round hole, and the second sealing ring 800 is sealingly sleeved on the plunger.

[0060] As shown in the attached Figure 3 and attached Figure 5 figures, in order to facilitate the limitation of the positions of the first sealing ring 500 and the second sealing ring 800 so that they will not move along the axis of the plunger as the plunger expands and contracts, a heat dissipation plate 900 is arranged between the guide sleeve 600 and the second component. A through hole 910 for the plunger to pass through is formed on the heat dissipation plate 900, and the diameter of the through hole 910 is smaller than the outer diameters of the first sealing ring and the second sealing ring. Thus, the heat dissipation plate 900 and the second component 120 can form a limiting groove for limiting the first sealing ring, and the heat dissipation plate and the guide sleeve form a limiting groove for limiting the second sealing ring.

[0061] As shown in the attached Figure 5 figures, a heat dissipation channel 920 extending from the through hole 910 to the edge of the heat dissipation plate 900 is formed on the end face of the heat dissipation plate 900. The heat generated by the friction between the plunger 200 and the first sealing ring and the second sealing ring can be discharged to the outside through the heat dissipation channel 920.

[0062] Each guide sleeve 600 can correspond to a separate heat dissipation plate 900. More preferably, as shown in the attached Figure 5As shown, multiple heat dissipation plates are integrated into a heat dissipation element for easy assembly. The heat dissipation element is a plate member including three through holes 910, which respectively correspond to the three plungers. A Y-shaped heat dissipation groove 930 is formed on the end face of the plate member between the three through holes 910, and the three ends of the Y-shaped heat dissipation groove 930 respectively extend to the three through holes 910, thereby increasing the heat dissipation path.

[0063] As shown in the attached Figure 1 drawing, Figure 6 drawing, Figure 7 As shown, to ensure the stable connection between the guide sleeve 600 and the second member 120, the guide sleeve 600 is defined by a connecting member 1000 detachably connected to the second member 120. Specifically, the connecting member 1000 includes a cylindrical main body 1100, and an end plate 1200 is provided at the inner end (the end facing the second member 120) of the cylindrical main body 1100. A through hole 1300 coaxial with each guide sleeve 600 is formed on the end plate 1200, and the aperture of the through hole 1300 is larger than the outer diameter of the first pipe section 620 and smaller than the outer diameter of the second pipe section 630.

[0064] Meanwhile, a set of connecting columns 1400 corresponding to the connection holes (not shown in the figure) in the edge area of the second member 120 are also provided at the inner end of the cylindrical main body 1100. The connecting columns 1400 have screw holes or connecting holes 1410 with internal threads. When the connecting member 1000 is connected to the second member 120 by bolts or screws, as shown in the attached Figure 3 drawing, each guide sleeve 600 is inserted into a through hole and extends into the cavity 1110 of the cylindrical main body 1100. The surface 1210 of the end plate 1200 facing the second member abuts against the outer end face 631 of the second pipe section 630 of the guide sleeve 600, thereby tightly attaching the guide sleeve to the heat dissipation plate. At this time, the inner end of the spring 700 can abut against the surface 1220 of the end plate 1200 facing away from the second member.

[0065] As shown in the attached Figure 7 drawing, a positioning sleeve 1500 is also formed at the surface 1210 of the end plate facing the second member. Each positioning sleeve 1500 is coaxial with a through hole 1300 and has an inner diameter larger than the aperture of the through hole 1300. The outer diameter of each positioning sleeve 1500 is equivalent to that of the cylinder 127 constituting a pressure increasing cavity 122 on the second member. When the connecting member 1000 is connected to the second member, each cylinder 127 is inserted into a positioning sleeve 1500, thereby ensuring the accurate position of the connecting member 1000 and the second member 120 and avoiding shear force on the bolts or screws connecting them.

[0066] At this time, as shown in the attached Figure 3As shown, the heat dissipation plate 900 is also located in the positioning sleeve 1500. For the convenience of heat dissipation, as shown in the appendix Figure 7 As shown, a notch 1510 is formed on the positioning sleeve 1500 and is communicated with the outer end of the heat dissipation channel 910 on the heat dissipation plate 900. At the same time, the Y-shaped heat dissipation grooves 930 of the heat dissipation element face the second member and their centers are aligned with the gaps between the three cylinders 127 for easy heat dissipation.

[0067] Embodiment 2

[0068] This embodiment discloses a high-pressure cleaner, which can be various known trolley-type cleaners or hand-held cleaners. As shown in the appendix Figure 8 and appendix Figure 9 As shown, it includes the above-mentioned plunger pump 10 and a driving mechanism 20 for driving the plunger 200 in the plunger pump 10 to reciprocate relative to the pump body 100. The driving mechanism 20 is preferably a swash plate type driving mechanism, and the driving mechanism 20 includes a transmission assembly 21 and a driving main body 22.

[0069] As shown in the appendix Figure 10 As shown, the transmission assembly 21 includes a swash plate 211. The inclined surface of the swash plate 211 abuts against the outer ends of the plurality of plungers 200. The swash plate 211 can adopt various known swash plate structures. More preferably, the swash plate 211 is a flat thrust bearing.

[0070] As shown in the appendix Figure 10 As shown, the swash plate 211 is installed on a rotating member 212. The rotating member 212 includes a disc body 2121. A connecting hole 2122 is formed at the center of the disc body 2121. The axis of the connecting hole 2122 is parallel to the axis of the plunger and forms an acute angle with the outer end surface of the disc body 2121 facing the swash plate 211. A connecting sleeve 2123 is eccentrically arranged at the outer end surface of the disc 2121. The swash plate 211 is coaxially sleeved on the outer periphery of the connecting sleeve 2123, so that the end surface of the swash plate 211 facing the plunger is inclined.

[0071] As shown in the appendix Figure 10As shown, the rotating member 212 is connected to a planet carrier 214 by a bolt 213 passing through a connection hole 2122. The planet carrier 214 is rotatably arranged in a first housing 215 through a bearing. The first housing 215 is connected to the end face of the connecting member 1000 facing away from the pump body. At least one driven gear 216 with an axis parallel to the axis of the plunger is rotatably arranged thereon, preferably two and arranged oppositely. The driven gear 216 meshes with a driving gear 217 and a fixed ring gear 218. The planet carrier, the driven gear, the driving gear and the ring gear form a planetary transmission structure. The driving gear 217 can be coaxially sleeved on one end of a transmission shaft 219. Preferably, the driving gear 217 is directly formed on the circumferential surface of the transmission shaft 219 to form a gear shaft. The other end of the transmission shaft 219 extends to the outside of the planet carrier 214 and is torsionally connected to drive the motor 221 of the driving host 22.

[0072] During operation, the motor 221 drives the transmission shaft 219 to rotate, driving the driving gear 217 to rotate. The driving gear 217 drives the driven gear 216 to rotate relative to the ring gear 218, thereby driving the planet carrier 214 to rotate. The planet carrier 214 drives the transmission member 212 to rotate and finally drives the swash plate 211 to rotate. The rotation of the swash plate drives the plurality of plungers to reciprocate telescopically.

[0073] Of course, the transmission assembly 21 can also adopt other feasible structures. For example, the transmission assembly 21 is a gear reduction mechanism, and the motor can also be connected to the transmission shaft 219 through a shaft sleeve or a coupling, etc.

[0074] In some embodiments, the driving host 22, the transmission assembly 21 and the plunger pump 10 are located in the same housing (not shown in the figure) and cannot be quickly disassembled and assembled. During use, the whole is carried.

[0075] In other embodiments, as shown in the appended Figure 1 appended Figure 2 appended Figure 6 shown, the transmission assembly 21 and the plunger pump 10 form a cleaning machine head, and the driving host and the cleaning machine head are of a structure that can be quickly disassembled and assembled. Thus, the cleaning machine head can be driven by the driving host 22 of various known multi-head power tools.

[0076] More preferably, the connection structure between the transmission assembly 21 and the driving host 22 is as follows:

[0077] As shown in the appended Figure 6 appended Figure 9 appended Figure 10As shown, the transmission assembly 21 includes a connector 2100 detachably connected to the first housing 215. The connector 2100 includes a square socket portion 2110 and a limiting portion 2120. The outer contour of the socket portion 2110 is preferably square, and the center of the socket portion 2110 is a square hole. At least one side wall of the socket portion 2110 is formed with a boss 2111 extending a certain distance from its outer end to its inner end. Preferably, the bosses 2111 are formed on all four side walls; a clamping groove 2130 is formed between the boss 2111 and the outer end face 2121 of the limiting portion 2120. A spline connector 2200 is coaxially and rotatably arranged in the connector 2100. The spline connector 2200 is fixed in the inner hole of a bearing in the connector or is movably inserted into a bushing in the connector and is limited in the connector by a shaft retaining ring. The transmission shaft 2100 is coaxially inserted into the connection hole of the spline connector 2200. The spline hole of the spline connector 2200 is used for torque transmission connection with a spline 224 mounted on the rotating shaft of the motor 221, as shown in the appendix Figure 11 As shown, when assembled into one body, the spline 224 is inserted into the spline hole to achieve torque transmission connection.

[0078] As shown in the appendix Figure 9 and the appendix Figure 11 As shown, the driving main body 22 includes a main body housing 222, which is used to provide an installation space and a holding space required for manual operation, etc. The shape of the main body housing 222 can refer to the outer shapes of various existing hand tools. For example, it can be the shape of a connector of a pistol-shaped electric drill or the shape of a connector of a pen-shaped electric drill, etc. Taking the pistol-shaped electric drill as an example, the main body housing 222 can be composed of two symmetrical halves (only the structure of the left half is shown in the figure), with a cavity inside and a structure with a socket at one end. It includes a holding portion for human hands and an installation portion. An approximately circular inner cavity is formed at the installation portion, and the socket 2221 is formed at the front end of the installation portion. When the cleaning machine head needs to be assembled with the driving main body 22 into one body, the connector is inserted into the socket 2221.

[0079] As shown in the appendix Figure 9 As shown, the motor 221 is arranged inside the main body housing 222. The rotating shaft of the motor 221 faces the socket 2221 and is coaxial with the socket 2221. A control board, a battery and other structures possessed by conventional electric tools are also arranged inside the main body housing 222. Starting buttons, steering switching keys and other structures possessed by conventional electric tools are also arranged on the main body housing 222. This is known technology and will not be elaborated here.

[0080] As shown in the appendix Figure 11As shown, when it is necessary to connect the transmission component 21 to the driving host 22, at least one blocking block 223 inside the host housing 222 can be embedded into the card slot 2130 and fit against the inner end surface of the boss 2111. At this time, the blocking block 223 blocks the movement of the boss 2111, thereby restricting the removal of the connector from the host housing 222. When it is necessary to disconnect the connector from the driving host, moving the blocking block 223 out of the card slot 2130 can release the restriction of the blocking block 223 on the movement of the connector 2100. At this time, the connector 2100 can be pulled out of the host housing 222.

[0081] The structure for driving the above-mentioned blocking block 223 to move between different positions to achieve locking and unlocking of the connector is as follows. As shown in the appended Figure 11 and the appended Figure 12 As shown, a knob 225 and a fixed block 226 are coaxially arranged inside the host housing 222. The axis of the knob 225 is coaxial with the axis of the socket of the host housing 222 and can rotate relative to the host housing. Under the action of an external force, the knob 225 can rotate relative to the host housing 222 around its axis, so as to cooperate with the fixed block 226 to drive the movement of the blocking block 223. The fixed block 226 is fixed inside the host housing.

[0082] As shown in the appended Figure 13 As shown, the knob 225 includes a first ring 225b and a second ring 225c that are coaxial and have a gap 225a between them. They have the same inner diameter. The first ring 225b faces outward, and the second ring 225c faces inward. They are connected by an operating part 225d located at their edges. There are two operating parts 225d and they are located on opposite sides of the first ring. Each operating part 225d has a part that protrudes to the outside of the host housing 222, so as to facilitate manually rotating the knob 225.

[0083] As shown in the appended Figure 12 - appended Figure 14As shown, the outer diameter of the first ring 225b is greater than that of the second ring 225c. The distance of the gap 225a is equivalent to the thickness of the blocking block 223, and the blocking block 223 is located at the gap 225a. Two oppositely-positioned bumps 225e are formed on the circumference of the second ring 225c. A first connection hole 225f is formed on the bump. A second connection hole 225g facing each first connection hole 225f is formed on the part of the first ring outside the circumference of the second ring. A pin 225h parallel to the axis of the first ring is installed at the coaxial first and second connection holes. The blocking block 223 is arranged on the pin 225h. The pin 225 passes through the arc-shaped driving hole 223a on the blocking block 223. When the pin 225h is located at the first end 223b of the arc-shaped driving hole 223a, the projection of the blocking block 223 and the round hole of the first ring 225b on the same projection plane perpendicular to the axis of the first ring 225b has an overlapping part; when the pin 225 is located at the second end 223c of the arc-shaped hole 223a, the projection of the blocking block 223 and the round hole of the first ring 225b on the same projection plane perpendicular to the axis of the first ring 225b has no overlapping part or has very little overlapping part and the overlapping part is not located at...

[0084] As shown in the attached Figure 12 and the attached Figure 15 As shown, the fixing block 226 is fixed inside the knob 225. It includes a plugging part 226a matching the socket part 2110 of the connecting head 2100 and an installation disc 226b. The outer contour of the plugging part 226a matches the inner hole of the socket part 2110, and the plugging part 226a extends into the first and second rings. When the cleaning machine head is connected to the driving main machine, the plugging part 226a is inserted into the socket part 2110 of the connecting head. The installation disc 226b is fixedly connected to the main machine housing. A limiting boss 226c is formed on the installation disc 226b. The limiting boss 226c extends from the surface of the installation disc 226b facing the knob towards the knob, and its quantity matches that of the blocking blocks 223. In this solution, there are four limiting bosses 226c. Two are located on the upper side of the installation disc 226b, and they cooperate to limit the vertical movement of one blocking block between them. The other two are located on the lower side of the installation disc 226b, and they cooperate to limit the vertical movement of the other blocking block between them.

[0085] As shown in the attached Figure 12 and the attached Figure 13 and the attached Figure 15 and the attached Figure 16As shown, two arc-shaped grooves 225i are formed on two opposite sides of the second ring 225c. The openings of the two arc-shaped grooves 225i face the mounting plate 226b of the fixed block 226, and the two arc-shaped grooves 225i and the two bumps 225e are located on the upper, lower, left, and right sides of the second ring 225c. A return spring 227 is arranged in each arc-shaped groove 225i. The arc-shaped groove 225i includes a long groove section and a short groove section. The width of the long groove section is greater than that of the short groove section. The return spring is located in the long groove section. The two ends of the return spring 227 abut against the two ends of the long groove section. A abutting convex block 226d is inserted into the short groove section. The abutting convex platform 226d extends from the mounting plate 226b towards the end face of the rotary ring in the direction of the rotary ring and extends into the short groove section. When the rotary ring is twisted under an external force, it cooperates with the abutting convex platform 226d to compress the return spring 227.

[0086] As shown in the Figure 14 accompanying drawings, in the normal state, the return spring 227 makes the pin 225h located at the first end 223b of the arc-shaped hole 223a. At this time, the connector 2100 cannot be effectively inserted. When it is necessary to install or remove the cleaning machine head, rotate the knob 225. The knob 225 drives the pin 225h to rotate. The pin 225h drives the blocking block to move away from the center of the insertion part 226a. At the same time, the return spring 227 is compressed. At this time, the connector of the cleaning machine head can be inserted into the main machine housing towards the socket. After inserting the cleaning machine head, release the knob 225. The knob 225 returns under the reaction force of the return spring 227. Thus, the pin on the knob drives the blocking block to return (move towards the center of the insertion part) and is embedded into the card slot of the connector. The blocking block blocks the boss 2111 of the connector from exiting, and finally the connector is limited in the main machine housing.

[0087] As shown in the Figure 12 accompanying Figure 13 accompanying Figure 15 drawings, for the convenience of assembly, a plurality of arc-shaped through holes 225j are formed on the part of the first ring 225b located on the outer periphery of the second ring. The mounting plate 226b is also provided with a limit catch 226e matching each arc-shaped through hole 225j. The limit catch 226e is arranged on the three limit bosses 226c. The limit catch 226e passes through the arc-shaped through hole 225j, and its hook part is slidably connected to the outer surface of the first ring 225b, thereby connecting the knob 225 and the fixed block 226 into a whole.

[0088] As shown in the Figure 12 accompanying Figure 13 accompanying Figure 15As shown, a shielding portion 226f that is opposite to the arc-shaped groove 225i and shields the notch of the arc-shaped groove 225i is further formed on the circumferential surface of the mounting disk 226b. Thus, when the knob 225 and the fixing block 226 are connected as a whole, the shielding portion 226f can limit the return spring 227 from exiting the arc-shaped groove 225i, thereby having better coverage of the return spring 227 and better mechanical strength at the same time.

[0089] When assembling the driving host 22, the knob 225 and the fixing block 226 can be first connected as a whole, and then they can be integrally connected to the half shell of the host housing to facilitate reducing the installation difficulty.

[0090] There are still various implementation manners of the present invention. All technical solutions formed by using equivalent transformations or equivalent substitutions fall within the protection scope of the present invention.

Claims

1. The cleaning machine head includes a plunger pump and a transmission assembly. The plunger pump includes a pump body and a plunger that can be telescoped in its boosting chamber. A first sealing ring is provided between the plunger and the boosting chamber for sealing. It is characterized in that: The plunger is movably arranged in the central hole of a guide sleeve connected to the pump body. The length of the plunger is greater than that of the guide sleeve, and the central hole enables the plunger not to contact the wall of the pressure boosting chamber where it is located. A set of grooves extending inwards from its end are formed at the hole wall of the central hole, so that the contact area between the part of the plunger located within the guide sleeve and the hole wall of the central hole is smaller than the area of the outer peripheral surface of the part of the plunger located within the guide sleeve. A heat dissipation plate is arranged between the guide sleeve and the pump body. The first sealing ring is limited in the limiting groove formed by the heat dissipation plate and the pump body. Heat dissipation channels extending from the through hole for the plunger on the heat dissipation plate to the edge of the heat dissipation plate are formed at the end face of the heat dissipation plate. There are three plungers distributed in a triangular shape. A heat dissipation element is arranged at one end of the pump body facing the guide sleeve. The heat dissipation element has through holes for each plunger to pass through. Heat dissipation channels extending from each through hole to the edge of the heat dissipation element and a Y-shaped heat dissipation groove connecting the three through holes are formed at the end face of the heat dissipation element.

2. The cleaning machine head according to claim 1, characterized in that: The groove is a through groove extending from one end of the central hole to the other end, and the cross-sectional shape of the central hole is gear-shaped.

3. The cleaning machine head according to claim 1, wherein: The guide sleeve includes a coaxial first pipe section and a second pipe section. The outer diameter of the second pipe section is greater than that of the first pipe section. The guide sleeve and the heat dissipation element are pressed against the end of the pump body through a connecting piece connected to the pump body.

4. The cleaning machine head according to claim 3, characterized in that: The connecting piece further includes a positioning sleeve matching the cylinder forming the pressure boosting chamber. Notches communicating with each heat dissipation channel are formed on the positioning sleeve.

5. The cleaning machine head according to any one of claims 1-4, characterized in that: The pump body includes a first member and a second member. An inlet and an outlet perpendicular to each other are formed on the first member. The first member and the second member are combined to form an annular cavity. A first channel communicating the inlet and the annular cavity is formed on the first member. A discharge chamber communicating with the outlet, at least two pressure boosting chambers, a second channel communicating each pressure boosting chamber and the annular cavity, and a third channel connecting each pressure boosting chamber and the discharge chamber are formed on the second member. A first one-way valve allowing fluid to enter the pressure boosting chamber from the annular cavity is arranged in the second channel. A second one-way valve allowing fluid to enter the discharge chamber from the pressure boosting chamber is arranged in the third channel.

6. The cleaning machine head according to claim 5, characterized in that: A rod joint coaxial with and communicating with the inlet is formed on the first member, and a pop-up spring is coaxially arranged in the rod joint.

7. High-pressure washer, characterized in that: It includes the cleaning machine head according to any one of claims 1-6 and a motor for driving the cleaning machine head to work.

8. The high-pressure washer according to claim 7, characterized in that: The motor is movably connected to the transmission assembly. The transmission assembly is located in the first housing, and the motor is located in the main machine housing. The first housing is detachably connected to the main machine housing.

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