A low-noise high-pressure cleaning machine

Abstract

This invention relates to the field of cleaning machine technology, specifically a low-noise high-pressure cleaner. This cleaner aims to solve the technical problem of significant noise and vibration generated by the rigid collision between the plunger and the tilting wheel during reversal in existing small direct-drive high-pressure cleaners. The technical solution adopted in this invention mainly includes: an eccentric transmission mechanism driven by a motor spindle, which comprises a tilting wheel, a first bearing, and an elastic buffer element disposed between the two; the elastic buffer element and the tilting wheel are connected by mutually cooperating inclined surfaces, a second bearing is fixed to the end of the tilting wheel away from the first bearing, and one end of the plunger rod abuts against the outer end face of the second bearing. This invention absorbs the reversal impact through the elastic buffer element, achieving soft contact and converting part of the radial force into a stable axial force. Combined with a stable bearing mounting structure and a drum-shaped cylinder design, it significantly reduces operating noise and vibration while maintaining the advantages of compact structure and light weight.

Description

Technical Field

[0001] This invention relates to the field of cleaning machine technology, specifically a low-noise high-pressure cleaning machine. Background Technology

[0002] As a common household and commercial cleaning device, the miniaturization and lightweighting of high-pressure washers have become important development directions for improving product portability and user experience. Traditional household high-pressure washers typically use a motor-driven crankshaft connecting rod mechanism to drive the plunger in reciprocating motion. While this structure offers stable operation and high reliability, it suffers from problems such as large size, heavy weight, and complex structure, making it inconvenient for ordinary household users to move, store, and operate.

[0003] To meet the demand from home users for compact equipment, various small direct-drive high-pressure washers have gradually appeared on the market. For example, a high-pressure washer plunger pump disclosed in patent document CN114412774A uses a motor spindle directly connected to a tilting wheel to drive the plunger reciprocating motion, eliminating the need for a traditional crankcase and connecting rod mechanism, significantly reducing the overall size and weight of the machine, and improving the advantages of structural simplicity and manufacturing cost.

[0004] However, this type of miniaturized, direct-drive structure is relatively compact and space-constrained, with the plunger typically moving directly against the outer edge of the swashplate. As the swashplate rotates, its radius changes periodically, causing the plunger to rigidly collide with the swashplate at the moment of reversal, producing a noticeable impact sound.

[0005] Therefore, how to effectively suppress noise and vibration during operation while maintaining the advantages of compact structure and light weight of small direct-drive cleaning machines has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a low-noise high-pressure washer. The technical problem this invention seeks to solve is how to effectively suppress noise and vibration during operation while maintaining the advantages of a compact, lightweight, and small direct-drive washer.

[0007] The objective of this invention can be achieved through the following technical solution: A low-noise high-pressure washer, comprising a pump body, a plunger frame, and a cylinder, which are sequentially sealed and fixed, and a plunger rod that reciprocates within the plunger frame driven by a drive mechanism. The drive mechanism includes a motor and an eccentric transmission mechanism driven by the motor spindle. The eccentric transmission mechanism includes a tilting wheel, a first bearing, and an elastic buffer element. The outer ring of the first bearing is fixed inside the cylinder, and the inner ring of the first bearing is fixed to the motor spindle. The elastic buffer element is fixedly disposed between the tilting wheel and the inner ring of the first bearing, and the central axis of the tilting wheel is aligned with the rotation axis of the first bearing. A second bearing is fixedly connected to the end of the tilting wheel away from the first bearing, and one end of the plunger rod abuts against the outer end face of the second bearing. This design incorporates an elastic buffer element between the tilting wheel and the inner ring of the first bearing, creating an axial elastic connection in the eccentric transmission mechanism. When the piston rod reaches the reversing position, the thrust exerted by the tilting wheel on the piston rod is first absorbed by the elastic element, converting it into elastic deformation energy. Subsequently, the elastic element releases this energy, smoothly driving the piston to change direction, achieving soft-contact reversal and avoiding instantaneous rigid impact. The elastic buffer element allows the tilting wheel to slightly adapt axially, and can absorb a small amount of impact from circumferential fluctuations when the load changes, maintaining smooth transmission. It also converts the sliding friction between the piston and the tilting wheel into rolling friction, further reducing friction noise.

[0008] Furthermore, the elastic buffer element has a first inclined surface that is inclined axially at one end near the tilting wheel, and the tilting wheel has a second inclined surface that cooperates with the first inclined surface on the side near the elastic buffer element.

[0009] Furthermore, the inclined wheel has a first inclined groove on the side away from the second inclined surface, the bottom surface of the first inclined groove is parallel to the second inclined surface, and one end of the second bearing is fixed in the first inclined groove.

[0010] Furthermore, the second bearing includes, in sequence along the axial direction, a first turntable, a ball bearing, and a second turntable. The first turntable is fixed in a first inclined groove, and the outer end face of the second turntable abuts against one end of the plunger rod.

[0011] Furthermore, the inclined wheel has a fixed groove recessed inward at one end of the second inclined surface, and the side wall of the fixed groove has a first limiting protrusion. One end of the motor spindle extends into the fixed groove and is circumferentially fixed to the first limiting protrusion. The bottom of the fixed groove has a through hole, and the fixing member passes through the through hole and is axially fixed to the motor spindle.

[0012] Furthermore, a coaxial second inclined groove is provided along the inner wall of the first inclined groove, with the first and second inclined grooves set inward in a stepped manner.

[0013] Furthermore, the elastic buffer element has a positioning protrusion protruding outward at one end near the tilting wheel, and the first bearing includes an inner turntable, a steel ball, and an outer turntable in a radial direction, with the inner circumferential surface of the positioning protrusion abutting against the outer circumferential surface of the inner turntable.

[0014] Furthermore, the elastic buffer element has an axially penetrating fixing hole in the middle, and the side wall of the fixing hole has a second limiting protrusion, which is circumferentially fixed to one end of the motor spindle.

[0015] Furthermore, one end of the hydraulic cylinder is sealed and fixedly connected to the motor housing of the motor. The hydraulic cylinder has a fixed seat protruding towards the motor housing end, and the first bearing is located inside the fixed seat. The hydraulic cylinder has a first fixed cylinder protruding towards the plunger bracket end, and the axial length of the first fixed cylinder is greater than the axial length of the fixed seat.

[0016] Furthermore, the plunger holder includes a base portion that seals against the pump body and a second fixed cylinder that protrudes from the base portion toward the cylinder. The second fixed cylinder is sealed and fixed to the first fixed cylinder. Three plunger cavity walls also protrude from the base portion toward the cylinder. One end of the plunger rod is located inside the plunger cavity wall and reciprocates.

[0017] Compared with the prior art, the technical effects of this invention are as follows: 1. The elastic buffer element is located between the tilting wheel and the inner ring of the first bearing, directly absorbing and buffering the axial impact force generated when the plunger reverses direction, which reduces impact noise. By setting the cooperation of the first and second tilting surfaces, part of the radial component force generated by the rotation of the tilting wheel is converted into a smoother axial pressure, optimizing the force transmission path and reducing vibration noise caused by radial sway. The first tilting groove and the coaxial second tilting groove provide a precise and stable installation reference for the second bearing, ensuring the stability of the second bearing's running trajectory and avoiding additional vibration and abnormal noise caused by uneven or loose mounting surfaces. 2. The elastic buffer element itself acts as a flexible damping element, effectively isolating the direct transmission of the high-frequency rotational vibration of the motor spindle to the pump body end, reducing the vibration and noise of the entire machine. 3. Through the circumferential fixation of the first limiting protrusion in the fixing groove with the motor spindle, and the second limiting protrusion in the fixing hole of the elastic buffer element, bidirectional torque transmission from the motor spindle to the tilting wheel without relative slippage is achieved, ensuring the accuracy and constancy of the eccentricity. IV. The positioning protrusion on the elastic buffer element abuts against the outer circumference of the inner disc of the first bearing. This design ensures the concentricity of the elastic buffer element, the inner ring of the bearing, and the main shaft, preventing additional vibration caused by uneven mass due to eccentric rotation. V. The first fixed cylinder of the hydraulic cylinder and the second fixed cylinder of the plunger frame are sealed and fixed, forming a robust large-space drum-shaped structure. This effectively resists structural deformation caused by internal water pressure pulsation and impact, providing a solid foundation for the smooth reciprocating motion of the plunger. It indirectly reduces friction and noise caused by structural deformation. The drum-shaped structure also facilitates the filling of grease, achieving long-term effective lubrication and further reducing wear and friction noise. VI. The eccentric mass of a traditional tilting wheel is concentrated on a radial protrusion, and the centrifugal force generated during rotation presents a sharp pulse peak per revolution. This periodically drastically changing excitation force is the main source of vibration and noise. In this design, the mass of the tilting wheel is evenly distributed along the axial direction, and the centrifugal force generated during rotation is smoother, thus significantly reducing vibration and noise. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention.

[0019] Figure 2 This is an enlarged view of point A in the present invention.

[0020] Figure 3 The tilting wheel of the present invention is a three-dimensional Figure 1 .

[0021] Figure 4 The tilting wheel of the present invention is a three-dimensional Figure 2 .

[0022] Figure 5 This is a perspective view of the elastic buffer element of the present invention.

[0023] Figure 6 This is a three-dimensional view of the hydraulic cylinder of the present invention.

[0024] Figure 7 This is a perspective view of the plunger holder of the present invention.

[0025] Drawing number markings: 1. Pump body; 2. Plunger bracket; 21. Base; 22. Second fixed cylinder; 23. Plunger cavity wall; 3. Oil cylinder; 31. Fixed seat; 32. First fixed cylinder; 4. Plunger rod; 5. Motor; 51. Motor spindle; 52. Motor housing; 6. Inclined wheel; 61. Second inclined surface; 62. Fixed groove; 63. First limiting protrusion; 64. Through hole; 65. First inclined groove; 66. Second inclined groove; 7. First bearing; 71. Inner turntable; 72. Steel ball; 73. Outer turntable; 8. Elastic buffer element; 81. Fixed hole; 82. Second limiting protrusion; 83. Positioning protrusion; 84. First inclined surface; 9. Fixing component; 10. Second bearing; 101. First turntable; 102. Rotating ball; 103. Second turntable. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that the descriptions of directions such as "upper", "lower", "left", "right", "top", and "bottom" in this invention are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] according to Figures 1 to 7 As shown, the present invention provides a low-noise high-pressure washer, mainly comprising a pump body 1, a plunger frame 2, a hydraulic cylinder 3, a plunger rod 4, and a drive mechanism. The drive mechanism includes a motor 5 and an eccentric transmission mechanism driven by the motor spindle 51. The eccentric transmission mechanism is the core component for reducing noise, specifically including a tilting wheel 6, a first bearing 7, and an elastic buffer element 8.

[0029] One end of the hydraulic cylinder 3 is sealed and fixedly connected to the motor housing 52 of the motor 5 through a sealing ring or other means. Inside the hydraulic cylinder 3, a fixed seat 31 is formed protruding towards the motor housing 52. The first bearing 7 is installed and fixed in the fixed seat 31. The first bearing 7 includes an inner rotating disk 71, a steel ball 72 and an outer rotating disk 73 in a radial direction. The outer rotating disk 73, i.e., the outer ring, is fixed in the fixed seat 31 by interference fit or snap-fit, while the inner rotating disk 71, i.e., the inner ring, is fixed on the motor main shaft 51 and rotates with the main shaft.

[0030] At the other end of the hydraulic cylinder 3, that is, the end facing the plunger bracket 2, a first fixed cylinder 32 is protruded. The axial length of the first fixed cylinder 32 is designed to be greater than the axial length of the fixed seat 31 to form sufficient structural support space.

[0031] An elastic buffer element 8 is fixedly disposed between the tilting wheel 6 and the inner ring, i.e., the inner turntable 71, of the first bearing 7. Specifically, an axially penetrating fixing hole 81 is provided in the middle of the elastic buffer element 8, and the side wall of the fixing hole 81 protrudes inward to form a second limiting protrusion 82. One end of the motor spindle 51 passes through the first bearing 7 and extends into the fixing hole 81, and is circumferentially fixed by the cooperation between the second limiting protrusion 82 and the side wall of the fixing hole 81, thereby ensuring that the elastic buffer element 8 and the motor spindle 51 rotate synchronously without relative rotation. At the same time, the end of the elastic buffer element 8 near the tilting wheel 6 protrudes outward to form a positioning protrusion 83. After assembly, the inner circumferential surface of the positioning protrusion 83 is in close contact with the outer circumferential surface of the inner turntable 71 of the first bearing 7. This design ensures that the elastic buffer element 8, the inner ring of the first bearing 7, and the motor spindle 51 maintain a high degree of concentricity, preventing additional vibration caused by rotational mass eccentricity.

[0032] The central axis of the tilting wheel 6 is aligned with the rotation axis of the first bearing 7, i.e., the axis of the motor spindle 51. A second inclined surface 61 is machined on the side of the tilting wheel 6 near the elastic buffer element 8. Correspondingly, a first inclined surface 84, which mates with the second inclined surface 61, is formed on the end of the elastic buffer element 8 near the tilting wheel 6. The first inclined surface 84 and the second inclined surface 61 fit together, allowing the tilting wheel 6 to be stably mounted on the elastic buffer element 8. A fixing groove 62 is also recessed inward at the end of the tilting wheel 6 near the second inclined surface 61. The sidewall of the fixing groove 62 has a first limiting protrusion 63. The end of the motor spindle 51 extends further into this fixing groove 62 and is circumferentially fixed through the engagement of the first limiting protrusion 63 and the sidewall of the fixing groove 62, thereby forming a slip-free bidirectional torque transmission from the motor spindle 51 to the tilting wheel 6. A through hole 64 is provided at the bottom of the fixing groove 62. A fixing piece 9 passes through the through hole 64 and is screwed into the threaded hole at the end of the motor spindle 51, thus achieving the final axial fastening connection between the tilting wheel 6 and the motor spindle 51. At this point, the motor spindle 51, the elastic buffer element 8, and the tilting wheel 6 are fixedly connected into a transmission unit that can rotate synchronously. The elastic properties of the elastic buffer element 8 give the tilting wheel 6 a certain elastic floating ability in the axial direction.

[0033] A first inclined groove 65 is machined on the side of the inclined wheel 6 away from the second inclined surface 61, i.e., away from the motor 5. The bottom surface of the first inclined groove 65 is parallel to the second inclined surface 61. Along the inner wall of the first inclined groove 65, a second inclined groove 66 is further recessed axially and coaxially with it, so that the first inclined groove 65 and the second inclined groove 66 sink inward in a stepped manner. A second bearing 10 is fixedly installed in this inclined groove structure. The second bearing 10 includes, in sequence along the axial direction, a first turntable 101, a ball bearing 102, and a second turntable 103. The first turntable 101 is fixed in the first inclined groove 65, and the outer end face of the second turntable 103 is used to abut against one end of the plunger rod 4. This stepped groove structure provides a precise and stable mounting reference for the second bearing 10.

[0034] The plunger holder 2 includes a base portion 21 that is sealed against the pump body 1 by elements such as a sealing gasket, and a second fixed cylinder 22 protruding from the base portion 21 toward the cylinder 3. The second fixed cylinder 22 is sealed and fixed to the first fixed cylinder 32 on the cylinder 3 by means of threaded connection, snap-fit, or welding. After the first fixed cylinder 32 and the second fixed cylinder 22 are connected, they together form a robust, large-space drum-shaped structure. In addition, three plunger cavity walls 23 protrude from the base portion 21 toward the cylinder 3 in a circumferential arrangement. One end of the plunger rod 4 is located in the corresponding plunger cavity wall 23, and the other end face abuts against the outer end face of the second turntable 103 of the second bearing 10, and can reciprocate within the plunger cavity wall 23 under the drive of the drive mechanism.

[0035] The working principle of this invention is as follows: After the motor 5 starts, the motor main shaft 51 drives the elastic buffer element 8 and the tilting wheel 6, which are circumferentially fixed to it, to rotate together. Since the bottom surface of the first tilting groove 65 in the tilting wheel 6 is tilted, when it rotates, the rotational motion is converted into the axial reciprocating motion of the plunger rod 4 through the second bearing 10. When the plunger rod 4 moves to the end of its stroke and needs to change direction, a large reverse impact force is generated. At this time, since the tilting wheel 6 is connected to the main shaft through the elastic buffer element 8, this impact force will force the tilting wheel 6 to produce a small elastic displacement in the axial direction. The impact energy is absorbed by the elastic buffer element 8 and converted into its elastic deformation energy, and then released smoothly, pushing the plunger rod 4 to turn smoothly, thereby realizing soft contact reversal, effectively avoiding the instantaneous rigid impact between the plunger rod 4 and the tilting wheel 6 at the reversal point in the traditional structure, and significantly reducing impact noise. At the same time, the damping characteristics of the elastic buffer element 8 also isolate the transmission of the high-frequency vibration of the motor 5 to the pump body 1. The introduction of the second bearing 10 converts the sliding friction between the plunger rod 4 and the tilting wheel 6 into rolling friction, further reducing the operating friction noise. The drum-shaped structure formed by the hydraulic cylinder 3 and the plunger bracket 2 enhances the overall rigidity, resists internal pressure pulsation, and provides a stable foundation for low-noise operation.

[0036] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection defined by the claims of the present invention.

Claims

1. A low-noise high-pressure washer, comprising a pump body (1), a plunger frame (2), and a cylinder (3) sequentially sealed and fixed, and a plunger rod (4) reciprocating within the plunger frame (2) driven by a drive mechanism, wherein the drive mechanism comprises a motor (5) and an eccentric transmission mechanism driven by a motor spindle (51), characterized in that: The eccentric transmission mechanism includes a tilting wheel (6), a first bearing (7), and an elastic buffer element (8) as a flexible damping element; the outer ring of the first bearing (7) is fixed inside the oil cylinder (3), and the inner ring of the first bearing (7) is fixed on the motor spindle (51); the elastic buffer element (8) is fixedly disposed between the tilting wheel (6) and the inner ring of the first bearing (7), and the end of the elastic buffer element (8) near the tilting wheel (6) has a first inclined surface (84) inclined along the axial direction, and the side of the tilting wheel (6) near the elastic buffer element (8) has a second inclined surface (61) that cooperates with the first inclined surface (84), and the central axis of the tilting wheel (6) is consistent with the rotation axis of the first bearing (7); the end of the tilting wheel (6) away from the first bearing (7) is fixedly connected to a second bearing (10), and one end of the plunger rod (4) abuts against the outer end face of the second bearing (10).

2. The low-noise high-pressure washer according to claim 1, characterized in that: The inclined wheel (6) has a first inclined groove (65) on the side away from the second inclined surface (61). The bottom surface of the first inclined groove (65) is parallel to the second inclined surface (61), and one end of the second bearing (10) is fixed in the first inclined groove (65).

3. The low-noise high-pressure washer according to claim 2, characterized in that: The second bearing (10) includes a first turntable (101), a ball (102), and a second turntable (103) in sequence along the axial direction. The first turntable (101) is fixed in the first inclined groove (65), and the outer end face of the second turntable (103) abuts against one end of the plunger rod (4).

4. A low-noise high-pressure washer according to claim 3, characterized in that: The inclined wheel (6) is located on the second inclined surface (61) with a fixed groove (62) recessed inward at one end. The side wall of the fixed groove (62) has a first limiting protrusion (63). One end of the motor spindle (51) extends into the fixed groove (62) and is circumferentially fixed to the first limiting protrusion (63). The bottom of the fixed groove (62) has a through hole (64). The fixing member (9) passes through the through hole (64) and is axially fixed to the motor spindle (51).

5. A low-noise high-pressure washer according to claim 4, characterized in that: A coaxial second inclined groove (66) is provided along the inner wall of the first inclined groove (65), and the first inclined groove (65) and the second inclined groove (66) sink inward in a stepped manner.

6. A low-noise high-pressure washer according to claim 1, characterized in that: The elastic buffer element (8) has a positioning protrusion (83) protruding outward at one end near the tilting wheel (6). The first bearing (7) includes an inner turntable (71), a steel ball (72) and an outer turntable (73) in a radial direction. The inner circumferential surface of the positioning protrusion (83) abuts against the outer circumferential surface of the inner turntable (71).

7. A low-noise high-pressure washer according to claim 6, characterized in that: The elastic buffer element (8) has an axially penetrating fixing hole (81) in the middle. The side wall of the fixing hole (81) has a second limiting protrusion (82), which is circumferentially fixed to one end of the motor spindle (51).

8. A low-noise high-pressure washer according to any one of claims 1 to 7, characterized in that: One end of the hydraulic cylinder (3) is sealed and fixedly connected to the motor housing (52) of the motor (5). The hydraulic cylinder (3) has a fixed seat (31) protruding towards the motor housing (52). The first bearing (7) is located inside the fixed seat (31). The hydraulic cylinder (3) has a first fixed cylinder (32) protruding towards the plunger frame (2). The axial length of the first fixed cylinder (32) is greater than the axial length of the fixed seat (31).

9. A low-noise high-pressure washer according to claim 8, characterized in that: The plunger frame (2) includes a base part (21) that is sealed against the pump body (1) and a second fixed cylinder (22) that protrudes from the base part (21) toward the oil cylinder (3). The second fixed cylinder (22) is sealed and fixed with the first fixed cylinder (32). Three plunger cavity walls (23) also protrude from the base part (21) toward the oil cylinder (3). One end of the plunger rod (4) is located in the plunger cavity wall (23) and reciprocates.

Images