Plunger pump and hand-held cleaning machine

Abstract

This application relates to a plunger pump, comprising a pump body with a high-pressure chamber, a drive component connected to the pump body and used to provide power, a transmission mechanism housed within the pump body, a plunger rotatably connected to the transmission mechanism, and a control device. The transmission mechanism converts the rotational motion of the drive component into the reciprocating motion of the plunger. The high-pressure chamber includes a first high-pressure chamber and a second high-pressure chamber symmetrically arranged at both ends of the plunger. The drive component drives both ends of the plunger to reciprocate within the first and second high-pressure chambers, respectively. The control device is signal-connected to the drive component and can control the drive component to rotate along a first direction or a second direction, thereby driving the transmission mechanism to rotate along the first or second direction. This design reduces the wear at the apex angle where the transmission mechanism and the plunger initially contact, thereby reducing single diagonal wear on the mating surfaces between the transmission mechanism and the plunger, and improving the service life of the plunger pump.

Description

Technical Field

[0001] This application relates to a plunger pump and a handheld cleaning machine, belonging to the field of power tool technology. Background Technology

[0002] With social development and technological advancements, handheld cleaning machines are increasingly widely used in people's lives as cleaning devices. Most handheld cleaning machines use radial piston pumps as their core pumps. In current technology, piston pumps mostly use a single-direction rotation of an eccentric shaft to drive the piston's reciprocating motion. After prolonged use, the bearing and piston mating surfaces experience severe wear, especially at the apex angle where the eccentric shaft first contacts the piston during rotation. This wear forms a single diagonal line, increasing the gap between the eccentric shaft and the piston. Consequently, the impact force of the liquid on the bearing located between the eccentric shaft and the piston increases, affecting the bearing's lifespan and, consequently, the overall lifespan of the machine.

[0003] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Summary of the Invention

[0004] The purpose of this invention is to provide a wear-resistant plunger pump with a long service life.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plunger pump, comprising:

[0006] The pump body includes an inlet, an outlet, and a high-pressure chamber connected to the inlet and the outlet;

[0007] A drive unit, which is connected to the pump body, is used to provide power;

[0008] A transmission mechanism, which is housed within the pump body; and

[0009] A plunger is rotatably connected to the transmission mechanism, which converts the rotational motion of the driving component into the reciprocating motion of the plunger.

[0010] The high-pressure chamber includes a first high-pressure chamber and a second high-pressure chamber symmetrically arranged at both ends of the plunger. The driving member drives both ends of the plunger to reciprocate within the first high-pressure chamber and the second high-pressure chamber, respectively.

[0011] The plunger pump also includes a control device, which is signal-connected to the drive member to cause the drive member to rotate in a first direction or a second direction, thereby driving the transmission mechanism to rotate in the first direction or the second direction, wherein the first direction and the second direction are different.

[0012] Furthermore, the control device includes a control unit that is signal-connected to the drive element, and a control element that is connected to the control unit;

[0013] Specifically, when an external force is applied to the control member for the nth time, the control unit controls the drive member to rotate in one of the first and second directions; when an external force is applied to the control member for the (n+1)th time, the control unit controls the drive member to rotate in the other of the first and second directions.

[0014] Furthermore, the control member can rotate relative to the pump body, and applying an external force can drive the control member to move relative to the pump body so that the drive member moves along the first direction or the second direction opposite to the first direction.

[0015] Furthermore, the control element is a trigger that can rotate relative to the pump body.

[0016] Furthermore, the plunger has a groove, and the transmission mechanism includes an eccentric shaft that is at least partially housed in the groove. The eccentric shaft drives both ends of the plunger to reciprocate between the first high-pressure chamber and the second high-pressure chamber. A first connecting member is provided between the eccentric shaft and the plunger. The driving member can drive the first connecting member to rotate along the first direction or the second direction via the eccentric shaft.

[0017] Furthermore, on the projection plane perpendicular to the axial length direction of the eccentric shaft, when the drive member rotates along the first direction, the first contact point of the first connector in the groove is one side of the upper part of the groove and the diagonal side of the lower part of the groove relative to the contact point of the upper part of the groove; when the drive member rotates along the second direction, the first contact point of the first connector in the groove is the other side of the upper part of the groove and the diagonal side of the lower part of the groove relative to the other side of the upper part of the groove.

[0018] Furthermore, the groove has a bottom wall and a wall connected to the bottom wall, and the end of the wall near the opening of the groove has a gap with the first connector, and the end of the wall near the bottom wall has a gap with the first connector.

[0019] Furthermore, the first connecting component is a ball bearing.

[0020] Furthermore, the first connecting member is a needle roller bearing, and the housing of the needle roller bearing is an arc-shaped curved surface.

[0021] Furthermore, a handheld cleaning machine is characterized by comprising a housing, a handle disposed on the housing for gripping, a power supply unit disposed within the housing for power supply, and a plunger pump disposed within the housing as described above.

[0022] The beneficial effects of the present invention are as follows: by controlling the drive component to rotate in the first or second direction through the control device, the transmission mechanism is driven to rotate in the first or second direction, thereby reducing the wear at the apex of the initial contact between the transmission mechanism and the plunger, thus reducing the single diagonal wear of the mating surface between the transmission mechanism and the plunger, and improving the service life of the plunger pump.

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a plunger pump according to an embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the piston pump shown in another direction;

[0026] Figure 3 for Figure 1 A cross-sectional view of a portion of the plunger pump structure shown in the image;

[0027] Figure 4 for Figure 3 Another cross-sectional view of the piston pump section structure shown in the diagram;

[0028] Figure 5 This is a schematic diagram of the first working state of a plunger pump in the prior art;

[0029] Figure 6 This is a schematic diagram of the second working state of a plunger pump in the prior art;

[0030] Figure 7 This is a schematic diagram of the third working state of a plunger pump in the prior art;

[0031] Figure 8 This is a schematic diagram of the fourth operating state of a plunger pump in the prior art;

[0032] Figure 9 This is a schematic diagram of the first working state of a plunger pump according to an embodiment of this application;

[0033] Figure 10 This is a schematic diagram of the second working state of a plunger pump according to an embodiment of this application;

[0034] Figure 11 This is a schematic diagram of the third working state of a plunger pump according to an embodiment of this application;

[0035] Figure 12 This is a schematic diagram of the fourth operating state of a plunger pump according to an embodiment of this application;

[0036] Figure 13 This is a schematic diagram of the fifth operating state of a plunger pump according to an embodiment of this application;

[0037] Figure 14 This is a schematic diagram of the sixth working state of a plunger pump according to an embodiment of this application;

[0038] Figure 15 This is a schematic diagram of the seventh operating state of a plunger pump according to an embodiment of this application;

[0039] Figure 16 This is a schematic diagram of the eighth working state of a plunger pump according to an embodiment of this application;

[0040] Figure 17 This is a schematic diagram of the structure of a handheld cleaning machine according to an embodiment of this application. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 4 The plunger pump 100 shown in one embodiment of the present invention includes a pump body 1, a drive component 2 connected to the pump body 1, and a transmission mechanism 3 and a plunger 4 housed within the pump body 1.

[0043] The pump body 1 includes an inlet 11, an outlet 13, an inlet channel 12 connected to the inlet 11 for liquid water to enter, an outlet channel 14 connected to the outlet 13 for liquid water to flow out, and a high-pressure chamber connected to the inlet 11 and the outlet 13. The inlet channel 12 and the outlet channel 14 are connected through the high-pressure chamber. The high-pressure chamber includes a first high-pressure chamber 16 and a second high-pressure chamber 17 symmetrically arranged at both ends of the plunger 4.

[0044] The inlet 11 can be connected to an external water source (not shown), and the outlet 13 can be connected to the water flow outlet channel (not shown) of the handheld cleaner, which is connected to the nozzle (not shown) of the handheld cleaner. Thus, water from the external source can sequentially pass through the inlet 11, the first high-pressure chamber 16 or the second high-pressure chamber 17, the outlet 13, and the water flow outlet channel, and finally be sprayed out by the nozzle of the handheld cleaner 200.

[0045] The transmission mechanism 3 includes an eccentric shaft 30, which is sequentially configured with a first connecting portion 31, a transmission portion 32, a second connecting portion 33, and a driving portion 34. The first connecting portion 31, the transmission portion 32, and the second connecting portion 33 are coaxially arranged, while the driving portion 34 is not coaxially arranged with the second connecting portion 33, thereby achieving eccentric rotation of the eccentric shaft 30. The distance between the axis of the driving portion 34 and the axis of the second connecting portion 33 is the eccentricity of the eccentric shaft 30. In this embodiment, the first connecting portion 31, the transmission portion 32, the second connecting portion 33, and the driving portion 34 are integrally formed, and the driving portion 34 is the eccentric part of the eccentric shaft 30. In other embodiments, the first connecting portion 31, the transmission portion 32, and the second connecting portion 33 may be integrally formed, and the driving portion 34 is mounted on the second connecting portion 33, and the driving portion 34 is an eccentric wheel. The specific structure of the eccentric shaft 30 is not specifically limited here.

[0046] The first connecting part 31 and the second connecting part 33 are provided separately, thereby positioning the eccentric shaft 30 relatively stably within the pump body 1. The eccentric shaft 30 is positioned within the pump body 1 by a fixing member, which can be a bearing or other component. Specifically, the first connecting part 31 is positioned and mounted on the pump body 1 by a first bearing 35, and the second connecting part 33 is positioned and mounted on the pump body 1 by a second connecting member 36. This makes it less likely for the eccentric shaft 30 to vibrate during rotation, reducing noise and improving stability.

[0047] In this embodiment, the driving component 2 for providing power is a motor 2 with a motor shaft 21, but it is not limited to this; the driving component 2 can also be other devices capable of providing power. To drive the eccentric shaft 30 to rotate eccentrically, the transmission mechanism 3 also includes a transmission assembly disposed between the motor 2 and the eccentric shaft 30. Specifically, the transmission assembly can be a first gear 38 and a second gear 39 meshing with each other. The first gear 38 is sleeved and fixed on the motor shaft 21, and the second gear 39 is sleeved and fixed on the transmission part 32. When the motor 2 is started, the motor shaft 21 drives the first gear 38 to rotate synchronously, thereby driving the second gear 39 and the eccentric shaft 30 to rotate, causing the eccentric shaft 30 to rotate eccentrically. Other gears can also be disposed between the first gear 38 and the second gear 39. The first gear 38 and the second gear 39 can be internally meshed or externally meshed. The specific structure of the transmission assembly is not specifically limited here. The transmission assembly can also include planetary gears, etc., and a transmission assembly with high positioning accuracy, good reliability, low noise, and long service life can be selected according to actual needs. In other embodiments, the eccentric shaft 30 can be directly fixedly connected to the motor shaft 21. The connection method can be sleeve, screw fixing, etc. The connection method between the eccentric shaft 30 and the motor shaft 21 is not specifically limited here and can be set according to actual needs. The structure of the transmission component and its installation method with the motor shaft 21 or the eccentric shaft 30 are existing technologies and will not be described in detail here. In addition, the motor 2 is also an existing structure and will not be described in detail here either. In order to improve the positioning stability between the motor shaft 21 and the pump body 1, a third bearing 22 is provided between the motor shaft 21 and the pump body 1 to realize the smooth rotation of the motor shaft 21 relative to the pump body 1.

[0048] The eccentric shaft 30 and the motor shaft 21 are misaligned, meaning that in the longitudinal direction of the plunger pump 100, the eccentric shaft 30 and the motor shaft 21 at least partially overlap, thus ensuring that the pump height H and pump width W of the plunger pump 100 are not changed (see [link to relevant documentation] for pump height H and pump width W). Figures 1 to 2 ), reduce the longitudinal dimension of the plunger pump 100, where the longitudinal direction is as follows: Figure 1 The direction indicated by the middle arrow c.

[0049] The pump body 1 also includes a plunger cavity 41, with the first high-pressure chamber 16 and the second high-pressure chamber 17 both connected to the plunger cavity 41. The plunger 4 is rotatably connected to the transmission mechanism 3, which converts the rotational motion of the driving member 2 into the reciprocating motion of the plunger 4 within the plunger cavity 41. Specifically, the driving member 2 drives both ends of the plunger 4 to reciprocate within the first high-pressure chamber 16 and the second high-pressure chamber 17 respectively via the eccentric shaft 30 of the transmission mechanism 3. Specifically, the plunger 4 is at least partially mounted on the eccentric shaft 30, and more specifically, it is at least partially mounted on the driving part 34. When the eccentric shaft 30 rotates, the driving part 34 rotates eccentrically, thereby driving the plunger 4 to reciprocate.

[0050] In addition, the plunger pump 100 also includes an inlet check valve 43 and an outlet check valve (not shown), and the plunger 4, the inlet check valve 43, and the outlet check valve form a high-pressure chamber. Obviously, each of the first high-pressure chamber 16 and the second high-pressure chamber 17 is provided with an inlet check valve 43 and an outlet check valve.

[0051] The inlet check valve 43 opens when the water pressure in the chamber decreases and closes when the water pressure increases. The outlet check valve closes when the water pressure in the chamber decreases and opens when the water pressure increases. The inlet check valve 43 and the outlet check valve 44 can be formed by connecting a spring and a valve body, with the valve body connected to the end of the spring. The specific structure and installation method of the inlet check valve 43 and the outlet check valve 44 are existing technologies and will not be described in detail here.

[0052] The plunger 4 has a first position and a second position. The first position is the extreme position in which the plunger 4 moves towards the first high-pressure chamber 16 within the plunger cavity 41. The second position is the extreme position in which the plunger 4 moves towards the second high-pressure chamber 17 within the plunger cavity 41. The eccentric shaft 30 drives the plunger 4 to reciprocate between the first and second positions. When the plunger 4 moves from the first position to the second position, the volume of the first high-pressure chamber 16 gradually increases, and the water pressure decreases. As a result, the inlet check valve 43 of the first high-pressure chamber 16 opens, and the outlet check valve closes, increasing the amount of liquid water in the first high-pressure chamber 16. Simultaneously, the volume of the second high-pressure chamber 17 gradually decreases, pressurizing the liquid water within the second high-pressure chamber 17. The inlet check valve 43 of the second high-pressure chamber 17 closes, and the outlet check valve opens, allowing the pressurized liquid water to flow out from the outlet check valve. When the plunger 4 moves from the second position to the first position, the volume of the first high-pressure chamber 16 gradually decreases, the water pressure rises, the inlet check valve 43 of the first high-pressure chamber 16 closes, the outlet check valve opens, and the pressurized liquid water flows out from the outlet check valve. Meanwhile, the inlet check valve 43 of the second high-pressure chamber 17 opens, the outlet check valve closes, and water is injected into the second high-pressure chamber 17.

[0053] During the movement of the plunger 4 between the first and second positions, the water in the inlet channel 12 can enter the first high-pressure chamber 16 or the second high-pressure chamber 17, which gradually increases in volume, through the inlet check valve 43. When the volume of the first high-pressure chamber 16 or the second high-pressure chamber 17 gradually decreases, the water in it can enter the outlet channel 14 through the outlet check valve.

[0054] In the prior art, please refer to Figures 5 to 8 When the drive mechanism (not shown) drives the piston 001, the eccentric shaft 002 rotates in a unidirectional cycle. If the rotation direction of the eccentric shaft 002 is clockwise, when the eccentric shaft 002 drives the upper end of the piston 001, viewed along the axial length of the eccentric shaft, the eccentric shaft 002 always first contacts and impacts the first contact point A on the left side of the upper end of the piston 001 (see...). Figure 5 Then, it continues to rotate on the contact surface to complete the drive of the upper end of plunger 001 (see...). Figure 6 When the eccentric shaft 002 drives the lower end of the plunger 001, the eccentric shaft 002 always first contacts and impacts the second contact point B on the right side of the lower end of the plunger 001 (see...). Figure 7 Then, continue rotating on the contact surface to complete the drive of the lower end of plunger 001 (see...). Figure 8 Then, the eccentric shaft 002 drives the upper end of the plunger 001 again, and the eccentric shaft 002 contacts and impacts the first contact point A on the left side of the upper end of the plunger 001, thus completing one rotation cycle of the eccentric shaft 002. Therefore, the impact contact between the eccentric shaft 002 and the upper and lower ends of the plunger 001 is always a fixed unilateral impact, which makes the wear of the impact side of the plunger 001 more severe than the unimpacted side, resulting in a reduction in the overall lifespan of the machine.

[0055] When the eccentric shaft 002 rotates counterclockwise, the impact points between the eccentric shaft 002 and the upper and lower ends of the plunger 001 are mirror images of the impact points between the eccentric shaft 002 and the upper and lower ends of the plunger 001 when the eccentric shaft 002 rotates clockwise, relative to the axis of the plunger 001. This will not be elaborated further here.

[0056] Please refer to the previous page. Figures 1 to 4 In this embodiment, the plunger pump 100 further includes a control device (not shown), which is signal-connected to the drive member 2 to cause the drive member 2 to rotate in a first direction or a second direction, thereby driving the transmission mechanism to rotate in the first direction or the second direction. Specifically, the first direction and the second direction are opposite; that is, one of the first direction and the second direction is clockwise, and the other is counterclockwise.

[0057] The control device includes a control unit connected to the drive component 2 via a signal, and a control element connected to the control unit. When an external force is applied to the control element for the nth time, the control unit controls the drive component 2 to rotate in one of the first and second directions. When an external force is applied to the control element for the (n+1)th time, the control unit controls the drive component 2 to rotate in the other of the first and second directions. That is, by applying an external force to the control element, the drive component 2 can be controlled to rotate in either the first or second direction. For example, if the control unit controls the drive component 2 to rotate in the first direction the first time an external force is applied, then the control unit controls the drive component 2 to rotate in the second direction the second time an external force is applied, and the control unit controls the drive component 2 to rotate in the first direction the third time an external force is applied. This enables the drive component 2 to drive the eccentric shaft 30 connected to it to rotate in either the first or second direction.

[0058] Specifically, when the transmission mechanism 3 drives the plunger 4 to work, the eccentric shaft 30 rotates in either the first direction or the second direction. In this embodiment, the rotation direction in the first direction is clockwise (e.g., Figure 9 (As indicated by arrow R), the second direction of rotation is counterclockwise (e.g., ...). Figure 13 (Direction indicated by arrow L). Observed along the axial length direction of the eccentric shaft 30, or on a projection plane perpendicular to the axial length direction of the eccentric shaft 30, when the eccentric shaft 30 rotates along the first direction and drives the upper end of the plunger 4, the eccentric shaft 30 first contacts and impacts the third contact point C on the left side of the upper end of the plunger 4 (see...). Figure 9 Then, it continues to rotate on the contact surface to complete the drive of the upper end of plunger 4 (see...). Figure 10 When the eccentric shaft 30 drives the lower end of the plunger 4, the eccentric shaft 30 first contacts and impacts the fourth contact point D on the right side of the lower end of the plunger 4 (see...). Figure 11 Then, continue rotating on the contact surface to complete the drive of the lower end of plunger 4 (see...). Figure 12 After switching the rotation direction of the eccentric shaft 30 from the first direction to the second direction, the eccentric shaft 30 rotates along the second direction. When the eccentric shaft 30 drives the upper end of the plunger 4, the eccentric shaft 30 first contacts and impacts the fifth contact point E on the right side of the upper end of the plunger 4 (see...). Figure 13 Then, it continues to rotate on the contact surface to complete the drive of the upper end of plunger 4 (see...). Figure 14 When the eccentric shaft 30 drives the lower end of the plunger 4, the eccentric shaft 30 first contacts and impacts the sixth contact point F on the left side of the lower end of the plunger 4 (see...). Figure 15 Then, continue rotating on the contact surface to complete the drive of the lower end of plunger 4 (see...). Figure 16 ).

[0059] The aforementioned control device controls the drive component 2 to rotate in either the first or second direction, thereby driving the eccentric shaft 30 to rotate in either the first or second direction. This reduces the wear at the apex angle where the transmission mechanism 3 and the plunger 4 first contact, thus reducing single diagonal wear on the mating surfaces between the transmission mechanism 3 and the plunger 4 and improving the service life of the plunger pump 100. How the control unit controls the rotation direction of the drive component 2 is existing technology and will not be described further here.

[0060] Applying external force to the control component can cause it to rotate or move relative to the pump body 1. Alternatively, the control component can be a sensor; when an operator applies external force to it, the control component senses the force and transmits a signal to the control unit, thereby enabling the control unit to control the rotation direction of the drive component 2. The specific structure and operation of the control component are not specifically limited here and can be configured according to implementation needs.

[0061] In this embodiment, the aforementioned control component can be a trigger 230 that rotates relative to the pump body 1. That is, the trigger 230 is driven to rotate relative to the pump body 1 so that the control unit controls the drive component 2 to rotate along the first direction or the second direction. Admittedly, in other embodiments, the control component can also be configured according to the actual situation, such as a touch button. In this case, simply touching the button is sufficient to control the drive component 2 to rotate along the first direction or the second direction, and no specific limitation is made here.

[0062] Please refer to the previous page. Figures 1 to 4 To ensure smooth relative rotation between the eccentric shaft 30 and the plunger 4, a first connecting member 6 is provided between them. Specifically, the inner ring of the first connecting member 6 is fixedly sleeved on the drive unit 34. The plunger 4 has a groove 42, and the first connecting member 6 and the eccentric shaft 30 are at least partially housed within the groove 42. The groove 42 has a bottom wall 421 and a groove wall 422 connected to the bottom wall 421, allowing the plunger 4 to be sleeved on the first connecting member 6. The eccentric shaft 30 drives the plunger 4 to move through the first connecting member 6, thereby making the plunger 4 and the eccentric shaft 30 rotatably connected. By switching the rotation in the first direction and the second direction through the aforementioned drive member 2, the single diagonal wear of the first connecting member 6 on the end face of the plunger 4 is changed to double diagonal wear, reducing the number of impacts on one side of the end face of the plunger 4, reducing unilateral wear, and extending the service life of the first connecting member 6. In this embodiment, the first connecting member 6 is a needle roller bearing, which contains thin and long rollers and has a compact radial structure. In another embodiment, the first connecting member 6 can be a ball bearing. Admittedly, in other embodiments, other bearings can be selected according to actual conditions, and no specific limitation is made here.

[0063] When the mating surface between the plunger 4 and the drive unit 34 is a regular plane, due to machining tolerances and assembly errors in the pump body 1, as well as wear during long-term use, the perpendicularity of the pump body deteriorates. This causes uneven stress on the first connecting member 6 between the plunger 4 and the drive unit 34, resulting in stress on the tip of the first connecting member 6. The retainer of the first connecting member 6 is easily damaged by this stress, leading to damage to the first connecting member 6 and shortening the service life of the plunger pump 100. To solve this problem, such as... Figure 3 As shown, the outer shell of the first connector 6 is an arc-shaped curved surface. Specifically, the diameter of the middle part of the first connector 6 is larger than the diameter of both ends, ensuring that the mating surface between the first connector 6 and the plunger 4 is centered and subjected to force, thus preventing wear on the tip of the first connector 6. Furthermore, please refer to... Figure 4When the first connector 6 is cylindrical, the end of the groove wall 422 near the opening of the groove 42 has a gap with the first connector 6, and the end of the groove wall 422 near the bottom wall 421 has a gap with the first connector 6. That is, both ends of the first connector 6 do not contact the groove wall 422, thus avoiding stress on the tip of the first connector 6. Specifically, the end of the groove wall 422 near the opening of the groove 42 has a first inclined surface 423, which is a plane or arc surface inclined from the side near the opening to the side away from the opening. The end of the groove wall 422 near the bottom wall 421 has a second inclined surface 424, which is a plane or arc surface inclined from the side near the bottom wall 421 to the side away from the bottom wall 421. Clearly, the first inclined surface 423 and the second inclined surface 424 are arranged around the circumference of the groove wall 422.

[0064] Please see Figure 3 or Figure 4 A sliding friction plate 37 is provided between the second connector 36 and the first connector 6, thereby reducing the friction between the end faces of the second connector 36 and the first connector 6, reducing the damage to the first connector 6 caused by friction, and improving the service life of the first connector 6.

[0065] Please see Figure 1 The plunger pump 100 is also equipped with a pressure relief device 15, which is connected to the inlet channel 12 and the outlet channel 14 respectively. This device is used to relieve excessive pressure when liquid water flows out, thereby improving the safety performance of the plunger pump 100. In existing cleaning machine structures, the inlet 11 and the pressure relief device 15 are on the same channel; that is, the pressure relief device 15 is partially located on the inlet channel 12. This creates resistance to the liquid water entering the plunger pump 100 from the inlet 11, thus failing to meet the 250L / h high flow rate requirement of the plunger pump 100. To obtain a small-volume, high-flow-rate plunger pump 100, in this embodiment, the pressure relief device 15 is disposed separately from the inlet channel 12 to avoid occupying the space of the inlet channel 12, thereby increasing the flow rate of the inlet channel 12. Furthermore, the pressure relief device 15 is parallel to at least a portion of the inlet channel 12, reducing the volume without affecting the performance of the plunger pump 100. The specific structure of the pressure relief device 15 is prior art and will not be described further here.

[0066] In the existing cleaning machine structure, on the plane where the water inlet channel 12 is located, the cross-sectional area of ​​the high-pressure chamber near the water inlet channel 12 is 19 mm². 2The relatively small area of ​​the plunger 4 limits the velocity of liquid water entering the high-pressure chamber through the inlet check valve 43. Furthermore, the diameter of the plunger 4 is typically 12mm, and the eccentricity of the eccentric shaft 30 is 3mm. Therefore, the stroke of the plunger 4 from the first position to the second position is 6mm. To increase the flow rate of the plunger pump 100, in this embodiment, the cross-sectional area of ​​the high-pressure chamber near the inlet channel 12 is greater than 35mm² in the plane containing the cross-section of the inlet channel 12. 2 The diameter of plunger 4 is increased to 14mm, the eccentricity of eccentric shaft 30 is 3.1-3.5mm, and the stroke of plunger 4 is 6.2-7.0mm. By increasing the cross-sectional area of ​​the high-pressure chamber, the diameter of plunger 4, and the eccentricity, the flow rate of plunger pump 100 is increased. It should be noted that the cross-sectional area of ​​the high-pressure chamber is the surface formed by directions a and b (see [reference needed] for directions a and b). Figure 1 , Figure 2 ).

[0067] A first seal 46 is provided inside the plunger cavity 41, forming a first sealing structure with the plunger 4 to prevent liquid water in the first high-pressure chamber 16 from entering the space where the transmission mechanism 3 is located. Similarly, a second seal 47 is provided inside the plunger cavity 41, forming a second sealing structure with the plunger 4 to prevent liquid water in the second high-pressure chamber 17 from entering the space where the transmission mechanism 3 is located. The first seal 46 and the second seal 47 can be structures such as sealing rings.

[0068] Because the plunger pump 100 has a first sealing structure and a second sealing structure, water in the first high-pressure chamber 16 and the second high-pressure chamber 17 is blocked, making it difficult for water to enter the space where the transmission mechanism 3, the first connecting member 6 and other structures are located. This prevents the first connecting member 6 from rusting, improves the service life of the plunger pump 100, and eliminates the need to use a stainless steel first connecting member 6, thus reducing costs.

[0069] In this embodiment, a first guide sleeve 48 is provided on the side of the plunger cavity 41 near the first high-pressure chamber 16 of the first seal 46. The first guide sleeve 48 is sleeved on the outer periphery of the plunger 4. The first guide sleeve 48 is used to guide the plunger 4 to move from the second position to the first position, thereby improving the accuracy and efficiency of the plunger 4's movement. In addition, it also reduces the loss of the plunger 4's reciprocating movement. Similarly, a second guide sleeve 49 is provided on the side of the plunger cavity 41 near the second high-pressure chamber 17 of the second seal 47. The second guide sleeve 49 is used to guide the plunger 4 to move from the first position to the second position. The structure, installation position, and function of the second guide sleeve 49 are exactly the same as those of the first guide sleeve 48, and will not be described again here.

[0070] In the existing plunger pump 100, the guide sleeve 48 is installed too close to the middle of the plunger 4, and the distance between it and the top of the plunger 4 is too large, which is not conducive to reducing the wear of the plunger 4 and the guiding accuracy is insufficient. In this embodiment, the first guide sleeve 48 is set close to the first high-pressure chamber 16, and the second guide sleeve 49 is set close to the second high-pressure chamber 17, thereby improving the guiding accuracy and reducing the wear of the plunger 4.

[0071] Please see Figure 17 The present invention also provides a handheld cleaning machine 200, which includes a housing 210, a handle 220 disposed on the housing 210 for gripping, a trigger 230 rotatable relative to the housing 210 to open and close the handheld cleaning machine 200, a power supply unit 240 disposed within the housing 210 for power supply, and a plunger pump 100 disposed within the housing 210 as shown above. The trigger 230 can not only open and close the handheld cleaning machine 200, but also serve as a control element for the plunger pump 100, thereby controlling the drive member to rotate in a first direction or a second direction.

[0072] The handle 220 is located below the housing 210 and one end is connected to the housing 210. The power supply unit 240 is located below the handle 220 and is electrically connected to the drive unit 2 of the plunger pump 100. A contact switch (not shown) for controlling the start or stop of the drive unit 2 is also provided between the power supply unit 240 and the drive unit 2. The handle 220 has a hollow structure, the contact switch is located inside the handle 220, and the cable (not shown) that enables at least partial electrical connection is located inside the handle 220.

[0073] The power supply unit 240 can be a power cord or a battery pack for connecting to external AC power. In this embodiment, the power supply unit 240 is a battery pack. By placing the power supply unit 240 and the trigger 230 near the handle 220, cable routing is facilitated, making the overall structure of the handheld cleaning machine 200 compact.

[0074] The trigger 230 is located on the handle 220, which makes it convenient for the operator to hold. When the drive unit is ready to switch between the first and second directions, the operator can hold the handheld cleaning machine 200 and directly press the trigger 230 on the handle 220.

[0075] The handheld cleaner 200 also includes a liquid outlet (not shown) provided on the housing 210 for dispensing liquid. The liquid outlet is connected to the plunger pump 100. The liquid outlet can be connected to a high-pressure gun to achieve high-pressure cleaning function, which can meet the general cleaning work of the household and is highly practical.

[0076] In this embodiment, the plunger pump 100 is small in size, has high pressure and high flow rate, which enables the handheld cleaning machine 200 to meet the requirements of small size and light weight while having high pressure and high flow rate, making it convenient for users to work and improving user experience and operating comfort.

[0077] In summary: By controlling the drive component to rotate in the first or second direction through the control device, the transmission mechanism is driven to rotate in the first or second direction, reducing the wear at the apex of the initial contact point between the transmission mechanism and the plunger, thereby reducing single diagonal wear on the mating surfaces between the transmission mechanism and the plunger and improving the service life of the plunger pump.

[0078] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the referred mechanism or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0079] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0080] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A handheld cleaning machine, comprising a housing, a handle disposed on the housing for gripping, a power supply unit disposed within the housing for supplying power, and a plunger pump disposed within the housing, characterized in that, The plunger pump includes: The pump body includes an inlet, an outlet, and a high-pressure chamber connected to the inlet and the outlet; A drive unit, which is connected to the pump body, is used to provide power; A transmission mechanism, which is housed within the pump body; and A plunger is rotatably connected to the transmission mechanism, which converts the rotational motion of the driving component into the reciprocating motion of the plunger. The high-pressure chamber includes a first high-pressure chamber and a second high-pressure chamber symmetrically arranged at both ends of the plunger. The driving member drives both ends of the plunger to reciprocate within the first high-pressure chamber and the second high-pressure chamber, respectively. The plunger pump further includes a control device, which is signal-connected to the drive member to cause the drive member to rotate in a first direction or a second direction, thereby driving the transmission mechanism to rotate in the first direction or the second direction. The first direction and the second direction are different. The plunger has a groove, and the transmission mechanism includes an eccentric shaft at least partially housed in the groove. The eccentric shaft drives both ends of the plunger to reciprocate between the first high-pressure chamber and the second high-pressure chamber. A first connecting member is provided between the eccentric shaft and the plunger. The drive member can drive the first connecting member to rotate in the first direction or the second direction on a projection plane perpendicular to the axial length direction of the eccentric shaft via the eccentric shaft. When the drive member rotates in the first direction, the first contact point of the first connecting member in the groove is one side of the upper part of the groove and the diagonal side of the lower part of the groove opposite to the contact point of the upper part of the groove. When the drive member rotates in the second direction, the first contact point of the first connecting member in the groove is the other side of the upper part of the groove and the diagonal side of the lower part of the groove opposite to the contact point of the other side of the upper part of the groove. The control device includes a control unit that is signal-connected to the drive component, and a control component that is connected to the control unit; Specifically, when an external force is applied to the control member for the nth time, the control unit controls the drive member to rotate in one of the first and second directions; when an external force is applied to the control member for the (n+1)th time, the control unit controls the drive member to rotate in the other of the first and second directions.

2. The handheld cleaning machine as described in claim 1, characterized in that, The control element is movable relative to the pump body, and an external force can be applied to drive the control element to move relative to the pump body so that the drive element rotates along the first direction or the second direction opposite to the first direction.

3. The handheld cleaning machine as described in claim 2, characterized in that, The control element is a trigger that can rotate relative to the pump body.

4. The handheld cleaning machine as described in claim 1, characterized in that, The groove has a bottom wall and a wall connected to the bottom wall. There is a gap between the end of the wall near the opening of the groove and the first connector. There is also a gap between the end of the wall near the bottom wall and the first connector.

5. The handheld cleaning machine as described in claim 1, characterized in that, The first connecting component is a ball bearing.

6. The handheld cleaning machine as described in claim 1, characterized in that, The first connecting member is a needle roller bearing, and the outer shell of the needle roller bearing is an arc-shaped curved surface.

Images