CN215805108U

CN215805108U - Plunger pump and hand-held type cleaning machine

Info

Publication number: CN215805108U
Application number: CN202121810583.6U
Authority: CN
Inventors: 查霞红; 赵凤丽; 周杰
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-02-11
Anticipated expiration: 2031-08-04
Also published as: WO2023011590A1

Abstract

A plunger pump comprises a pump body with a high-pressure chamber, a driving piece connected with the pump body and used for providing power, a transmission mechanism contained in the pump body, and a plunger rotationally connected with the transmission mechanism, wherein the transmission mechanism converts the rotary motion of the driving piece into the reciprocating motion of the plunger; height ofThe pressure chamber comprises a first high-pressure chamber and a second high-pressure chamber which are symmetrically arranged at two ends of the plunger, the driving part drives two ends of the plunger to do reciprocating motion in the first high-pressure chamber and the second high-pressure chamber respectively, the pressure of the pump body is 3-6MPa, the pump body comprises a first section corresponding to the diameter of the plunger in the axial length direction of the driving part, the pump body comprises a cross section perpendicular to the axial length direction of the driving part, and the area of at least part of the cross section in the first section is 33.6-59.6cm²The plunger pump has the advantages of being high in pressure, large in flow, high in efficiency, small in size and light in weight, achieving the characteristics of being light and handy and portable when being applied to a handheld cleaning machine, facilitating work of a user and improving operation experience and comfort level of the user.

Description

Plunger pump and hand-held type cleaning machine

Technical Field

The utility model relates to a plunger pump and a handheld cleaning machine, and belongs to the field of electric tools.

Background

With the development of society and the progress of science and technology, the handheld cleaning machine is more and more widely applied to the life of people as a cleaning device, and brings great convenience to the life of people. The handheld cleaning machine can be used for cleaning automobiles, glass doors and windows, courtyard roads, swimming pools, pets and the like, and has the characteristics of high efficiency, safety and convenience in use.

However, referring to fig. 1 and 2, most of the movement pumps of the handheld cleaning machines under 3MPa on the market use radial plunger pumps, and the pump height H of a single plunger pump with a pressure of 2.2MPa and a flow rate of 120L/H is 79.2mm, and the pump width W is 45.5mm (wherein, the dimension in the plunger extending direction is taken as the height, and the dimension perpendicular to the plunger extending direction is taken as the width). Referring to FIGS. 3 and 4, the pump height H of the single-plunger pump having a pressure of 2.4MPa and a flow rate of 210L/H was 100.6mm, and the pump width W was 45.5 mm. On the basis of the structure, when the pressure is increased to 5MPa and the flow rate is increased to 250L/H, please refer to fig. 5 and 6, the pump height H and the pump width W of the single-plunger pump are increased greatly, which results in an excessively large volume and fails to satisfy the light and handy requirement of the handheld cleaning machine.

Referring to fig. 7 and 8, most of the movement pumps of the handheld cleaning machines with a pressure of 3MPa or more are axial multi-plunger pumps, the pump height H of a three-plunger axial pump with a pressure of 3MPa and a flow rate of 250L/H is 67.4mm, and the pump width W is 71.4mm, but the pump length of the three-plunger axial pump is too large to meet the light and handy requirements of the handheld cleaning machines.

Therefore, how to reduce the volume of the core pump when the pressure of the core pump is increased to above 3Mpa and the flow rate is increased to 200-.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a plunger pump which is high in efficiency, small in size and light in weight.

In order to achieve the purpose, the utility model provides the following technical scheme: a plunger pump comprising:

the pump body comprises a water inlet, a water outlet and a high-pressure chamber connected with the water inlet and the water outlet;

the driving piece is connected with the pump body and used for providing power;

the transmission mechanism is partially accommodated in the pump body; and

the plunger is rotationally connected with the transmission mechanism, and the transmission mechanism converts the rotary motion of the driving piece into the reciprocating motion of the plunger;

wherein, the high pressure chamber includes that the symmetry sets up first high pressure chamber and second high pressure chamber at plunger both ends, the driving piece drive the both ends of plunger are in respectively first high pressure chamber with make reciprocating motion in the second high pressure chamber, the pressure of the pump body is 3-6MPa, the pump body is in the axial length direction of driving piece is including corresponding the first district section of plunger diameter, just the pump body includes the perpendicular cross section of driving piece axial length direction in the first district section, at least part the area of cross section is 33.6-59.6cm²。

Further, a cross section having a cross sectional area of 33.6 to 59.6cm2 is satisfied in the first section, and a ratio of a length formed in the axial length direction of the driving member to a length of the first section is not less than 0.7.

Further, along the extension direction of the plunger, the pump height of the pump body is 79.2-98.5 mm; the pump width of the pump body is 40.5-60.5mm along the direction perpendicular to the extension direction of the plunger.

Furthermore, the plunger is provided with a groove, the transmission mechanism comprises an eccentric shaft at least partially accommodated in the groove, the eccentric shaft drives two ends of the plunger to reciprocate between the first high-pressure chamber and the second high-pressure chamber, and a needle bearing is arranged between the eccentric shaft and the plunger.

Further, the shell of the needle bearing is an arc-shaped curved surface.

Further, the groove is provided with a groove bottom wall and a groove wall connected with the groove bottom wall, a gap is reserved between one end, close to the opening of the groove, of the groove wall and the needle roller bearing, and a gap is reserved between one end, close to the groove bottom wall, of the groove wall and the needle roller bearing.

Further, the eccentricity of the eccentric shaft is 3.1-3.5 mm.

Further, the plunger pump still include with the water inlet intercommunication with the inlet channel that supplies liquid water to get into, with the delivery port intercommunication is with the exhalant canal and the pressure relief device that supply liquid water to flow out, inhalant canal with pass through between the exhalant canal high pressure chamber intercommunication, pressure relief device is used for carrying out the pressure release when liquid water produces the excessive pressure when flowing out, pressure relief device with inhalant canal sets up apart from each other, just pressure relief device with at least part the inlet channel is parallel.

Further, the minimum cross-sectional area of the water inlet channel is more than 35mm²On the plane of the cross section of the water inlet channel, the cross section area of the high-pressure chamber close to the water inlet channel is larger than 35mm²。

The utility model also provides a handheld cleaning machine which comprises a shell, a handle arranged on the shell and used for holding, a switch piece capable of rotating relative to the shell to open and close the handheld cleaning machine, a power supply part configured on the shell and used for supplying power, and the plunger pump arranged in the shell.

The utility model has the beneficial effects that: the plunger pump has two high-pressure chambers for increasing liquid water pressure, and the pump body in the first section has a cross-sectional area of 33.6-59.6cm²The pressure of the pump body is 3-6MPa, the plunger pump has the advantages of high pressure, high flow, high efficiency, small volume and light weight, and is light and portable when being applied to a handheld cleaning machineThe characteristics, convenience of customers work and promotion user's operation experience sense and comfort level.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a cross-sectional view of a prior art single plunger pump with a pressure of 2.2MPa and a flow rate of 120L/h;

FIG. 2 is a schematic structural diagram of a single-plunger pump with a pressure of 2.2MPa and a flow rate of 120L/h in the other direction in FIG. 1;

FIG. 3 is a cross-sectional view of a prior art single plunger pump with a pressure of 2.4MPa and a flow rate of 210L/h;

FIG. 4 is a schematic structural diagram of the single-plunger pump with the pressure of 2.4MPa and the flow rate of 210L/h in the other direction in FIG. 3;

FIG. 5 is a cross-sectional view of a prior art single plunger pump with a pressure of 5MPa and a flow rate of 250L/h;

FIG. 6 is a schematic diagram of the single-plunger pump of FIG. 5 with a pressure of 5MPa and a flow rate of 250L/h in the other direction;

FIG. 7 is a cross-sectional view of a prior art three-plunger axial pump with a pressure of 3MPa and a flow rate of 250L/h;

FIG. 8 is a schematic structural diagram of the three-plunger axial pump of FIG. 7 at a pressure of 3MPa and a flow rate of 250L/h in the other direction;

FIG. 9 is a cross-sectional view of a plunger pump according to an embodiment of the present application;

FIG. 10 is a schematic view of the plunger pump shown in FIG. 9 in another orientation;

FIG. 11 is a cross-sectional view of a portion of the plunger pump shown in FIG. 9;

FIG. 12 is a cross-sectional view of the needle bearing shown in FIG. 11;

FIG. 13 is another sectional view of a portion of the plunger pump shown in FIG. 11;

FIG. 14 is a cross-sectional view of the plunger pump shown in FIG. 9 in a third orientation;

FIG. 15 is a cross-sectional view of the plunger pump shown in FIG. 9 in a fourth orientation;

fig. 16 is a schematic structural diagram of a handheld cleaning machine according to an embodiment of the present application.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 9 to 11, a plunger pump 100 according to an embodiment of the present invention includes a pump body 1, a driving member 2 connected to the pump body 1, and a transmission mechanism 3 and a plunger 4 at least partially accommodated in the pump body 1.

The pump body 1 comprises a water inlet 11, a water outlet 13, a water inlet channel 12 communicated with the water inlet 11 for liquid water to enter, a water outlet channel 14 communicated with the water outlet 13 for liquid water to flow out, and a high-pressure chamber connected with the water inlet 11 and the water outlet 13. The water inlet channel 12 is communicated with the water outlet channel 14 through a high-pressure chamber. The high pressure chamber comprises a first high pressure chamber 16 and a second high pressure chamber 17 symmetrically disposed at both ends of the plunger 4.

The water inlet 11 may be connected to an external water source (not shown), and the water outlet 13 may be in communication with a water outflow channel (not shown) of the hand-held washer, which is connected to a spray head (not shown) of the hand-held washer. Thus, water from an external water source can pass through the water inlet 11, the first high-pressure chamber 16 or the second high-pressure chamber 17, the water outlet 13 and the water flow outlet channel in sequence, and finally can be sprayed out by a spray head of the handheld cleaning machine.

The pressure of the pump body 1 is 3-6MPa, the cross section of the pump body 1 is 33.6-59.6cm on the plane perpendicular to the axial length direction of the driving piece 2²The pump height H of the pump body 1 is 79.2-98.5mm along the extension direction of the plunger 4, and the pump width W of the pump body 1 is 40.5-60.5mm along the extension direction perpendicular to the plunger 4. compared with the existing plunger pump, the plunger pump 100 has the advantages of large pressure, large flow, high efficiency, compact structure, small volume and light weight, and can meet the requirements of users. For example, when the pressure of the plunger pump 100 of the present embodiment is 5MPa and the flow rate is 250L/H, the pump height H of the pump body 1 is 85.5mm, and the pump width W of the pump body 1 is 40.5 mm. The pump height is a dimension of the pump body 1 in a direction indicated by an arrow a in fig. 9, the pump width is a dimension of the pump body 1 in a direction indicated by an arrow b in fig. 10, and a plane in which the cross-sectional area of the pump body 1 is parallel to a plane formed by the direction a and the direction b. In addition, the outer edge of the pump body may have an uneven condition, or the surface of the pump body is provided with some rib positions or grooves for fixing, so that the height H and the width W of the pump body are not fixed values, and the cross section area of the pump body is influenced; in the axial length direction of the drive element 2, the pump body 1 is provided with a first section corresponding to the diameter of the plunger 4, in which first section the area of at least part of the cross section of the pump body 1 is 33.6-59.6cm²(ii) a The ratio of the length of the cross sections formed in the axial length direction of the driving part 2 to the length of the first section (namely the diameter of the plunger) is larger than 0.7, so that when the pump body achieves high pressure (3-6MPa) and high flow (250L/h), the overall volume of the plunger pump is relatively small, and the handheld cleaning machine with high efficiency and small volume is obtained.

The transmission mechanism 3 comprises an eccentric shaft 30, a first connecting portion 31, a transmission portion 32, a second connecting portion 33 and a driving portion 34 are sequentially arranged on the eccentric shaft 30, the first connecting portion 31, the transmission portion 32 and the second connecting portion 33 are coaxially arranged, the driving portion 34 and the second connecting portion 33 are not coaxially arranged, therefore, eccentric rotation of the eccentric shaft 30 is achieved, and the distance between the axis of the driving portion 34 and the axis of the second connecting portion 33 is the eccentric distance 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 an eccentric portion 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, 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 eccentric shaft 30 is not particularly limited.

The first connecting portion 31 and the second connecting portion 33 are separately provided, thereby relatively stably positioning the eccentric shaft 30 in the pump body 1. The eccentric shaft 30 is positioned in the pump body 1 through a fixing member, which may be a bearing or the like, specifically, the first connecting portion 31 is positioned and installed on the pump body 1 through the first bearing 35, and the second connecting portion 33 is positioned and installed on the pump body 1 through the second bearing 36, so that the eccentric shaft 30 itself is not easy to generate vibration when rotating, noise is reduced, and stability is improved.

In the present embodiment, the driving member 2 for providing power is the motor 2 having the motor shaft 21, but the present invention is not limited thereto, and the driving member 2 may be other devices capable of providing power. In order to drive the eccentric shaft 30 to rotate eccentrically, the transmission mechanism 3 further includes a transmission component disposed between the motor 2 and the eccentric shaft 30, specifically, the transmission component may be a first gear 38 and a second gear 39 engaged with each other, the first gear 38 is sleeved and fixed on the motor shaft 21, the second gear 39 is sleeved and fixed on the transmission portion 32, the motor 2 is started, the motor shaft 21 drives the first gear 38 to rotate synchronously, so as to drive the second gear 39 and the eccentric shaft 30 to rotate, and the eccentric shaft 30 rotates eccentrically. Other gears can be arranged between the first gear 38 and the second gear 39, the first gear 38 and the second gear 39 can be meshed internally or externally, specific structures of the transmission assembly are not specifically limited, the transmission assembly can also comprise planet wheels and the like, and the transmission assembly with high positioning precision, good reliability, low noise and long service life can be selected according to actual needs. In other embodiments, the eccentric shaft 30 may be directly and fixedly connected to the motor shaft 21, the connection manner may be a sleeving manner, a screw fixing manner, or the like, and the connection manner between the eccentric shaft 30 and the motor shaft 21 is not specifically limited herein, and may be set according to actual requirements. The structure of the transmission assembly and the installation manner between the transmission assembly and the motor shaft 21 or the eccentric shaft 30 are prior art and will not be described herein. In addition, the motor 2 is also of a conventional structure, and is not described in detail herein. In order to improve the positioning stability between the motor shaft 21 and the pump body 1, a third bearing 22 is disposed between the motor shaft 21 and the pump body 1, so as to realize the smooth rotation of the motor shaft 21 relative to the pump body 1.

The eccentric shaft 30 and the motor shaft 21 are disposed in a staggered manner, that is, the eccentric shaft 30 and the motor shaft 21 at least partially overlap in the longitudinal direction of the plunger pump 100, so that the size of the plunger pump 100 in the longitudinal direction, which is indicated by an arrow c in fig. 9, is reduced without changing the pump height H and the pump width W of the plunger pump 100.

A plunger chamber 41 is also provided in the pump body 1, and the first high-pressure chamber 16 and the second high-pressure chamber 17 are both in communication with the plunger chamber 41. The plunger 4 is rotatably connected to the transmission mechanism 3, and the transmission mechanism 3 converts the rotary motion of the driving member 2 into the reciprocating motion of the plunger 4 in the plunger cavity 41, that is, the driving member 2 drives the two ends of the plunger 4 to reciprocate in the first high pressure chamber 16 and the second high pressure chamber 17 respectively through the eccentric shaft 30 of the transmission mechanism 3. Specifically, the plunger 4 is at least partially sleeved on the eccentric shaft 30, specifically, the plunger 4 is at least partially sleeved on the driving part 34, and when the eccentric shaft 30 rotates, the driving part 34 eccentrically rotates, so as to drive the plunger 4 to reciprocate.

The plunger pump 100 further includes a water inlet check valve 43 and a water outlet check valve (not shown), and the plunger 4, the water inlet check valve 43, and the water outlet check valve are surrounded to form a high-pressure chamber. It is clear that the first 16 and second 17 high pressure chambers are each provided with one inlet check valve 43 and one outlet check valve.

The inlet check valve 43 can be opened and closed when the water pressure in the chamber is reduced and the inlet check valve is raised. The water outlet one-way valve can be closed and lifted to be opened along with the reduction of the water pressure in the cavity. The water inlet check valve 43 and the water inlet check valve 43 may be formed by connecting a section of spring and a valve body, the valve body is connected to the end of the spring, and the specific structure and installation manner of the water inlet check valve 43 and the water inlet check valve 43 are the prior art and are not described herein again.

The plunger 4 has a first position and a second position, the first position being an extreme position of the plunger 4 moving in the plunger chamber 41 towards the first high pressure chamber 16, the second position being an extreme position of the plunger 4 moving in the plunger chamber 41 towards the second high pressure chamber 17, the eccentric shaft 30 carrying the plunger 4 to and fro between the first position and the second position. When the plunger 4 moves from the first position to the second position, the volume of the first high-pressure chamber 16 gradually increases, the water pressure decreases, the water inlet check valve 43 of the first high-pressure chamber 16 is opened, the water outlet check valve is closed, and the amount of liquid water in the first high-pressure chamber 16 increases; meanwhile, the volume of the second high-pressure chamber 17 is gradually reduced, the liquid water in the second high-pressure chamber 17 is pressurized, the water inlet check valve 43 of the second high-pressure chamber 17 is closed, the water outlet check valve is opened, and the pressurized liquid water flows out from the water 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 increases, the water inlet check valve 43 of the first high-pressure chamber 16 is closed, the water outlet check valve is opened, the pressurized liquid water flows out from the water outlet check valve, the water inlet check valve 43 of the second high-pressure chamber 17 is opened, the water outlet check valve is closed, and water is injected into the second high-pressure chamber 17.

During the movement of the plunger 4 between the first position and the second position, the water in the water inlet passage 12 can enter the first high pressure chamber 16 or the second high pressure chamber 17 with gradually increasing volume through the water inlet check valve 43, and when the volume of the first high pressure chamber 16 or the second high pressure chamber 17 is gradually reduced, the water in the water inlet passage can enter the water outlet passage 14 through the water outlet check valve.

In order to allow smooth relative rotation between the eccentric shaft 30 and the plunger 4, a needle bearing 6 is provided between the eccentric shaft 30 and the plunger 4, and specifically, an inner ring of the needle bearing 6 is fixedly sleeved on the driving portion 34. The plunger 4 is provided with a groove 42, the needle bearing 6 and the eccentric shaft 30 are at least partially accommodated in the groove 42, and the groove 42 is provided with a groove bottom wall 421 and a groove wall 422 connected with the groove bottom wall 421, so that the plunger 4 is sleeved on the needle bearing 6, and the plunger 4 is rotatably connected with the eccentric shaft 30.

During operation, the eccentric shaft 30 drives the plunger 4 to reciprocate, liquid water in the first high-pressure chamber 16 or the second high-pressure chamber 17 at two ends of the plunger 4 is pressurized, the reaction force of water pressure in the reciprocating process causes the bearing between the eccentric shaft 30 and the plunger 4 to bear a large dynamic load, the larger the pressure of the plunger pump 100 is, the larger the reaction force of water pressure is, the larger the bearing capacity borne by the bearing is, if the bearing is a ball bearing, in order to realize 3-6MPa pressure, the dynamic load of the bearing needs to meet 4-7KN or more, and the ball bearing with a larger diameter needs to be selected. The needle roller bearing 6 is provided with thin and long rollers (the length of the rollers is 3-10 times the diameter, and the diameter is generally not more than 5mm), so that the radial structure is compact, the inner diameter size and the load capacity are the same as those of other types of bearings, and the outer diameter is the smallest. In order to reduce the volume of the plunger pump 100, in the embodiment, the needle bearing 6 is used to realize the same pressure of 3-6MPa, and the volume of the pump body 1 is 40-50% smaller than that of the pump body 1 using the ball bearing, so that the effect of small volume and high load is achieved.

When the matching surface between the plunger 4 and the driving part 34 is a regular plane, the perpendicularity of the pump body is deteriorated due to the machining tolerance and assembly error of the pump body 1 and the abrasion of the pump body in the long-term use process, and the needle bearing 6 between the plunger 4 and the driving part 34 is easily stressed unevenly, so that the needle bearing 6 is stressed at the tip end, the retainer of the needle bearing 6 is easily stressed and damaged, the needle bearing 6 is damaged, and the service life of the plunger pump 100 is shortened. In order to solve the problem, as shown in fig. 12, the housing of the needle bearing 6 is an arc-shaped curved surface, specifically, the diameter of the middle part of the needle bearing 6 is larger than the diameters of the two ends, so as to ensure that the matching surface of the needle bearing 6 and the plunger 4 is stressed in a centered manner, and avoid the abrasion of the tip of the needle bearing 6. In addition, referring to fig. 13, when the needle bearing 6 is a cylindrical structure, a gap is formed between one end of the groove wall 422 close to the opening of the groove 42 and the needle bearing 6, and a gap is formed between one end of the groove wall 422 close to the groove bottom wall 421 and the needle bearing 6, that is, two ends of the needle bearing 6 are not in contact with the groove wall 422, so as to prevent the tip of the needle bearing 6 from being stressed. Specifically, one end of the groove wall 422 near the opening of the groove 42 has a first inclined surface 423, and the first inclined surface 423 is a plane or an arc surface that is inclined from a side near the opening to a side far from the opening. The end of the slot wall 422 close to the slot bottom wall 421 has a second inclined surface 424, and the second inclined surface 424 is a plane or an arc surface that is inclined from the side close to the slot bottom wall 421 to the side far from the slot bottom wall 421. It will be apparent that first chamfer 423 and second chamfer 424 are disposed about a circumference of slot wall 422.

Referring to fig. 11 or 13, a sliding abrasive disc 37 is disposed between the second bearing 36 and the needle bearing 6, so as to reduce friction between the second bearing 36 and the needle bearing 6, reduce damage to the needle bearing 6 caused by friction, and improve the service life of the needle bearing 6.

Referring to fig. 9 and 14, the plunger pump 100 is further provided with a pressure relief device 15, and the pressure relief device 15 is respectively communicated with the water inlet channel 12 and the water outlet channel 14, and is used for relieving pressure when excessive pressure is generated when liquid water flows out, so as to improve the safety performance of the plunger pump 100. In the structure of the existing cleaning machine, the water inlet 11 and the pressure relief device 15 are on the same channel, that is, the pressure relief device 15 is partially positioned on the water inlet channel 12, and resistance of liquid water entering the plunger pump 100 from the water inlet 11 is formed, so that the requirement of large flow rate of 250L/h of the plunger pump 100 cannot be met. In order to obtain the plunger pump 100 with small volume and large flow, in this embodiment, the pressure relief device 15 is disposed away from the water inlet channel 12 to avoid occupying the space of the water inlet channel 12, and the flow of the water inlet channel 12 is enlarged, and the pressure relief device 15 is parallel to at least a part of the water inlet channel 12, so that the volume is reduced on the premise of not affecting the performance of the plunger pump 100. Arrows in fig. 14 indicate the flow direction of liquid water, and the specific structure of the pressure relief device 15 is the prior art and will not be described herein again. In addition, referring to FIG. 15, the minimum cross-sectional area of the water inlet passage 12 is greater than 35mm²The flow rate of the water inlet passage 12 is further ensured.

In the structure of the existing cleaning machine, the cross section of the water inlet channel 12 is in the plane, and the cross section area of the high-pressure chamber close to the water inlet channel 12 is 19mm²Left and right, the area is smaller, and the water inlet through the water inlet one-way valve 43 is limitedThe speed of the liquid water entering the high pressure chamber and the diameter of the plunger 4 is typically 12mm and the eccentricity of the eccentric shaft 30 is 3mm, the stroke of the plunger 4 moving from the first position to the second position is 6 mm. In order to increase the flow rate of the plunger pump 100, in the present embodiment, the cross-sectional area of the high-pressure chamber near the water inlet channel 12 is greater than 35mm in the plane of the cross-sectional area of the water inlet channel 12²The diameter of the plunger 4 is increased to 14mm, the eccentricity of the eccentric shaft 30 is 3.1-3.5mm, and the stroke of the plunger 4 is 6.2-7.0 mm. By increasing the cross-sectional area of the high pressure chamber, the plunger 4 diameter, and the eccentricity, an increase in the flow rate of the plunger pump 100 is achieved. The cross-sectional area of the high-pressure chamber is defined by a plane formed in the direction a and a plane formed in the direction b.

A first sealing element 46 is arranged in the plunger cavity 41, the first sealing element 46 and the plunger 4 form a first sealing structure to prevent liquid water in the first high-pressure cavity 16 from entering the space where the transmission mechanism 3 is located, and similarly, a second sealing element 47 is arranged in the plunger cavity 41, and the second sealing element 47 and the plunger 4 form a second sealing structure to prevent liquid water in the second high-pressure cavity 17 from entering the space where the transmission mechanism 3 is located. The first seal 46 and the second seal 47 may be a sealing ring or the like.

The plunger pump 100 has the first sealing structure and the second sealing structure, so that water in the first high-pressure chamber 16 and the second high-pressure chamber 17 is blocked, the water is difficult to enter spaces of the transmission mechanism 3, the needle roller bearings 6 and other structures, the rusting of the needle roller bearings 6 is avoided, the service life of the plunger pump 100 is prolonged, the stainless steel needle roller bearings 6 are not needed, and the cost can be reduced.

Referring to fig. 9, in the present embodiment, a first guiding sleeve 48 is disposed on a side of the plunger cavity 41, which is located on the first sealing member 46 and close to the first high-pressure chamber 16, the first guiding sleeve 48 is sleeved on the periphery of the plunger 4, and the first guiding sleeve 48 is used for guiding the plunger 4 to move from the second position to the first position, so as to improve the moving accuracy of the plunger 4, improve the efficiency, and reduce the loss of the plunger 4 in the reciprocating movement. Similarly, the plunger cavity 41 is provided with a second guiding sleeve 49 on a side of the second sealing element 47 close to the second high pressure chamber 17, the second guiding sleeve 49 is used for guiding the plunger 4 to move from the first position to the second position, and the structure, the installation position and the function of the second guiding sleeve 49 are completely the same as those of the first guiding sleeve 48, and will not be described again.

In the structure of the existing plunger pump 100, the installation position of the guide sleeve is too close to the middle part of the plunger 4, the distance between the guide sleeve and the top end of the plunger 4 is too large, the loss of the plunger 4 is not reduced favorably, and the guide precision is not enough. In this embodiment, the first guide sleeve 48 is disposed near the first high-pressure chamber 16, and the second guide sleeve 49 is disposed near the second high-pressure chamber 17, thereby improving the guiding accuracy and reducing the loss of the plunger 4.

Referring to fig. 16, the present invention further provides a handheld cleaning machine 200, which includes a housing 210, a handle 220 disposed on the housing 210 for holding, a switch 230 capable of rotating relative to the housing 210 to open and close the handheld cleaning machine 200, a power source 240 disposed in the housing 210 for supplying power, and the plunger pump 100 disposed in the housing 210.

The handle 220 is located below the housing 210, one end of the handle is connected to the housing 210, the power source 240 is disposed below the handle 220, the power source 240 is electrically connected to the driving member 2 of the plunger pump 100, and a contact switch (not shown) for controlling the driving member 2 to start or stop is disposed between the power source 240 and the driving member 2. The handle 220 has a hollow structure, the contact switch is disposed in the handle 220, and a cable (not shown) for at least partially electrically connecting the contact switch is disposed inside the handle 220.

The power supply unit 240 may be a power line or a battery pack for externally connecting to the commercial power. In this embodiment, the power supply unit 240 is a battery pack. By disposing the power supply portion 240 and the switch member 230 near the handle 220, wiring is facilitated, making the overall structure of the hand-held washer 200 compact.

The switch member 230 is arranged on the handle 220, the handle 220 is arranged to be held conveniently by an operator, when the hand-held washing machine 200 is prepared to work, the operator holds the hand-held washing machine to start the switch member 230 on the handle 220; when ready to stop work, the operator simply closes the switch member 230 on the handle 220.

The handheld cleaning machine 200 further comprises a liquid outlet (not shown) which is arranged on the casing 210 and used for discharging liquid, the liquid outlet is communicated with the plunger pump 100, the liquid outlet can be externally connected with a high-pressure gun rod 250 to realize a high-pressure cleaning function, common household cleaning work is met, and the practicability is high.

In this embodiment, the plunger pump 100 is small in size, high in pressure and high in flow rate, so that the handheld cleaning machine 200 has high pressure and high flow rate and meets the requirements of small size and light weight, the handheld cleaning machine is convenient for a user to work, and the user experience feeling and the operation comfort level are improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A plunger pump, comprising:

the driving piece is connected with the pump body and used for providing power;

the transmission mechanism is at least partially accommodated in the pump body; and

wherein the high pressure chamber comprises a first high pressure chamber and a second high pressure chamber which are symmetrically arranged at two ends of the plungerThe driving part drives two ends of the plunger to respectively reciprocate in the first high-pressure chamber and the second high-pressure chamber, the pressure of the pump body is 3-6MPa, the pump body comprises a first section corresponding to the diameter of the plunger in the axial length direction of the driving part, the pump body comprises a cross section perpendicular to the axial length direction of the driving part, and the area of at least part of the cross section in the first section is 33.6-59.6cm²。

2. The plunger pump of claim 1, wherein a cross-sectional area of 33.6-59.6cm is satisfied in the first section²Is formed in the axial length direction of the driving member to the length ratio of the first section is not less than 0.7.

3. The plunger pump according to claim 1, wherein the pump body has a pump height of 79.2-98.5mm in the plunger extending direction; the pump width of the pump body is 40.5-60.5mm along the direction perpendicular to the extension direction of the plunger.

4. The plunger pump of claim 1 wherein said plunger has a recess therein, said transmission including an eccentric shaft at least partially received in said recess, said eccentric shaft driving said ends of said plunger to reciprocate between said first high pressure chamber and said second high pressure chamber, said eccentric shaft and said plunger having a needle bearing disposed therebetween.

5. The plunger pump of claim 4, wherein said needle bearing housing is arcuately curved.

6. The plunger pump as recited in claim 4 wherein said groove has a groove bottom wall and a groove wall connected to said groove bottom wall, said groove wall having a clearance with said needle bearing at an end adjacent to an opening of said groove, said groove wall having a clearance with said needle bearing at an end adjacent to said groove bottom wall.

7. The plunger pump according to claim 4, wherein the eccentricity of the eccentric shaft is 3.1-3.5 mm.

8. The plunger pump of claim 1, further comprising a water inlet channel in communication with the water inlet for entry of liquid water, a water outlet channel in communication with the water outlet for exit of liquid water, and a pressure relief device, wherein the water inlet channel is in communication with the water outlet channel via the high pressure chamber, the pressure relief device is configured to relieve pressure when excess pressure is generated when liquid water exits, the pressure relief device is disposed away from the water inlet channel, and the pressure relief device is parallel to at least a portion of the water inlet channel.

9. The plunger pump as claimed in claim 8, wherein the minimum cross-sectional area of the water inlet passage is 35mm or more²On the plane of the cross section of the water inlet channel, the cross section area of the high-pressure chamber close to the water inlet channel is more than or equal to 35mm²。

10. A hand-held washing machine, comprising a housing, a handle disposed on the housing for holding, a switch member rotatable relative to the housing for opening and closing the hand-held washing machine, a power supply portion disposed on the housing for supplying power, and the plunger pump as recited in any one of claims 1 to 9 disposed in the housing.