CN115419590A

CN115419590A - Plunger pump and high-pressure cleaning machine

Info

Publication number: CN115419590A
Application number: CN202211190900.8A
Authority: CN
Inventors: 刘伟才
Original assignee: Shanghai Yili Electric Co ltd; Zhejiang Yili Machinery and Electric Co Ltd
Current assignee: Shanghai Yili Electric Co ltd; Zhejiang Yili Machinery and Electric Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2022-12-02

Abstract

The invention provides a plunger pump and a high-pressure cleaning machine, comprising: the pump body and the pump cover; the pump body is connected with a pump cover; the pump cover includes: the pump cover water inlet, the pump cover water inlet channel, the pump cover water outlet channel, the water outlet one-way valve cavity, the pressurizing cavity and the one-way valve water inlet are formed in the pump cover; the water inlet of the pump cover is connected with the water inlet channel of the pump cover, the water inlet channel of the pump cover is connected with the water inlet of the one-way valve, the water inlet of the one-way valve is connected with the pressurizing cavity, the pressurizing cavity is connected with the water outlet channel of the pump cover, and the water outlet channel of the pump cover is connected with the water outlet one-way valve cavity; the pump body is provided with a pump body water inlet channel and a pump body water outlet channel, the pump body water inlet channel is connected with the pump cover water inlet, and the water outlet one-way valve cavity is connected with the pump body water outlet channel. This application arranges business turn over water check valve in the plunger front side rather than arranging in the position that the plunger is parallel, has reduced quantity and the area of the mounting hole on the pump cover perpendicular to plunger axial terminal surface to reduce the bearing area, improved the intensity of pump cover, make the pump can bear higher pressure, the pump cover can adopt engineering plastics, thereby practices thrift the cost.

Description

Plunger pump and high-pressure cleaning machine

Technical Field

The invention relates to the field of plunger pump structures, in particular to a plunger pump and a high-pressure cleaning machine.

Background

The high-pressure water jet cleaning technology is an efficient and energy-saving physical cleaning technology, and the high-pressure cleaning machine is widely applied in the fields of industry, commerce, civil use and the like. High pressure cleaners often use a plunger pump as the pressurizing component. However, the following problems are common to plunger pumps in the industry:

1. unreasonable stress and easy cracking. On pump cover and pump body connection terminal surface of traditional design, not only have three plunger pressure boost chamber, still have three one-way valve hole of intaking with plunger pressure boost chamber parallel arrangement, have 6 holes on the terminal surface promptly, and receive the pulling force in two holes simultaneously at the wall thickness between one-way valve hole and pressure boost chamber hole to easy fracture, this makes the pump cover structure be flat structure in addition, and this has the risk that intensity is not enough when changing the pump cover into engineering plastics.

2. Plunger pumps are volumetrically inefficient. Because the traditional design water inlet check valve is positioned at the position parallel to the plunger, the plunger pump cannot fill the pressurizing cavity in time during liquid pumping, and the volume efficiency is low. 3. The oil cylinder has high temperature, and moving parts such as bearings have short service life. Because the traditional plunger pump does not have a system in design and simultaneously considers the cooling problem, the temperature of the oil cylinder is high, and the service life of a moving part is relatively short. 4. Standardization and serialization issues are not systematically considered. In the whole plunger pump product, the traditional design is a pump design isolated from a pump, and less consideration is given to reusing parts as much as possible and developing a series of modular designs. 5. The traditional plunger pump has the defects of more material consumption and high cost, and is difficult to further adopt engineering plastics for mass production in view of the defects of structure and stress.

The prior art references are as follows:

patent CN214366686U discloses a structure of a plunger pump conventional in the cleaning machine industry, which has not only 3 pressurizing cavity holes but also 3 water inlet check valve holes on the end surface of a pump cover, and the pump cover has the defects of stress on the pump cover, and also has the defects of low volumetric efficiency and the like because the position of the water inlet check valve is not arranged at the front end of the plunger but is positioned parallel to the plunger.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a plunger pump and a high-pressure cleaning machine.

According to the invention, the plunger pump can be used for a high-pressure cleaning machine and comprises: the pump body and the pump cover;

the pump body is connected with the pump cover;

the pump cover includes: the pump cover water inlet, the pump cover water inlet channel, the pump cover water outlet channel, the water outlet one-way valve cavity, the pressurizing cavity, the water outlet one-way valve cavity communicating hole and the one-way valve water inlet;

the pump cover water inlet is connected with the pump cover water inlet channel, the pump cover water inlet channel is connected with the one-way valve water inlet, the one-way valve water inlet is connected with the pressurizing cavity, the pressurizing cavity is connected with the pump cover water outlet channel, and the pump cover water outlet channel is connected with the water outlet one-way valve cavity through a pump cover water outlet interface;

the bottom of the pressurizing cavity is provided with a water inlet one-way valve cavity, a plurality of water outlet one-way valve cavities are arranged in the water inlet one-way valve cavity, the water outlet one-way valve cavities are communicated through water outlet one-way valve cavity communicating holes, and water outlet one-way valves are arranged in the water outlet one-way valve cavities;

the pump body is provided with a pump body water inlet channel and a pump body water outlet channel, the pump body water inlet channel is connected with the pump cover water inlet, and the water outlet one-way valve cavity is connected with the pump body water outlet channel through a pump cover water outlet interface.

Preferably, a plurality of axial holes are formed in the pump body, plungers are installed in the axial holes, the plungers face one end of the pump cover in the axial direction and are connected with the pressurizing cavity, and a main check valve is installed in the water outlet channel of the pump body.

Preferably, the pump body further comprises: a pump body side water outlet and a pump body channel interface;

the pump body water inlet channel is connected with the pump cover water inlet through a pump body side water outlet;

the water outlet one-way valve is connected with a pump cover water outlet interface, the pump cover water outlet interface is connected with the pump body channel interface, and the pump body channel interface is connected with the pump body water outlet channel.

Preferably, the main check valve is connected with an overflow valve cavity, the overflow valve cavity is connected with an overflow channel, and the overflow channel is connected with the water inlet channel of the pump body;

and an overflow valve is arranged in the overflow valve cavity.

Preferably, a water seal structure is arranged on the periphery of the plunger, the water seal structure is arranged in the pressurizing cavity, and the water seal structure comprises a single water seal structure and a double water seal structure;

when a single water seal structure is adopted, a single water seal support is arranged on the periphery of the plunger, and a first water seal is arranged on the single water seal support;

when adopting two water seal structures, main water seal support and vice water seal support of plunger week side installation, main water seal leg joint vice water seal support and with form vice water seal installation room between the vice water seal support, the first water seal of main water seal support side-mounting, vice water seal installation room department installation second water seal.

Preferably, a support backwater channel is arranged on the main water seal support, the pressurizing cavity comprises a backwater cavity, and the backwater cavity is connected with the support backwater channel through a pump cover backwater channel.

Preferably, the pump cover is provided with a screw hole, one side of the pump cover, which is opposite to the pump body, is provided with a water inlet cover, and the water inlet cover is fixedly connected with the pump cover through a screw matched with the screw hole;

the pump cover is connected one side of the water inlet cover is provided with a groove, and a water inlet channel of the pump cover is formed between the groove and the water inlet cover.

Preferably, one side of the pump body, which is opposite to the pump cover, is connected with an oil cylinder, and a thrust bearing and a swash plate are arranged in the oil cylinder;

one side of the thrust bearing is connected with the plunger, the other side of the thrust bearing is connected with the swash plate, the swash plate is back to a connecting shaft on one side of the plunger, and the connecting shaft is connected with a power source.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the liquid suction device, the water inlet one-way valve cavity is arranged on one side, close to the plunger, of the pressurizing cavity, so that redundant space between the water inlet one-way valve cavity and the plunger, which is originally arranged in the pressurizing cavity, is reduced, and therefore the water inlet one-way valve can be quickly opened and the cavity where the plunger is located can be filled when the plunger absorbs liquid, and therefore the volume efficiency is improved;

2. the flow channel design of the application can cool the lubricating oil of the pump and the transmission part thereof, so that the service life of the transmission part is prolonged;

3. according to the pump cover, the pump body water inlet channel, the pump body water outlet channel and the overflow valve are designed on the pump body, so that the structure of the pump cover can be simplified, and the cost of the pump cover is reduced;

4. according to the pump cover, the water inlet and outlet one-way valves are arranged on the front side of the plunger instead of being arranged in the position where the plunger is parallel, so that the number and the area of the mounting holes, perpendicular to the axial end face of the plunger, of the pump cover are reduced, the pressure bearing area is reduced, the strength of the pump cover is improved, on one hand, the pump can bear higher pressure, on the other hand, the pump cover can be made of engineering plastics, and therefore the cost is saved;

5. this application can adopt single water seal or two water seals, the product serialization of being convenient for on the one hand is expanded, the application of the technology in groups of being convenient for manufacturing simultaneously to practice thrift the cost.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic diagram of a plunger pump with a double water seal structure;

FIG. 2 is a schematic diagram of a plunger pump in a single water seal configuration;

FIG. 3 is a schematic view of a plunger pump connected to a motor;

FIG. 4 is a sectional view of the pump cover embodiment 1 for a single water seal (the water inlet channel is a concave structure)

FIG. 5 is a shaft side view of pump cover embodiment 1 for a single water seal (with the water inlet on the pump cover side)

FIG. 6 is a sectional view of the pump cover for a single water seal in axial direction of embodiment 2 (the water inlet channel is a pipeline structure)

FIG. 7 is a side view of pump cover embodiment 2 for a single water seal (with the water inlet on the pump cover side)

FIG. 8 is a sectional view of the pump cover for single water seal in axial direction of embodiment 3 (the water inlet channel is a pipeline structure)

FIG. 9 is a shaft side view of pump cover embodiment 3 for a single water seal (water inlet at the center of the pump cover)

FIG. 10 is a cross-sectional side view of the pump cover embodiment 4 for double water seal based on FIG. 4

FIG. 11 is a cross-sectional axial view of pump cover embodiment 5 for double water seal based on FIG. 6

FIG. 12 is a cross-sectional side view of the pump cap embodiment 6 for double water seal based on FIG. 8

FIG. 13 is a cross-sectional axial view of the pump body embodiment 1

FIG. 14 is a cross-sectional axial view of a pump body embodiment 2

FIG. 15 is a side cross-sectional axial view of a pump body embodiment 3

FIG. 16 is a sectional view of a plunger pump in embodiment 1 (parts without valves)

FIG. 17 is a sectional view of the plunger pump embodiment 1 in the axial direction (showing the water inlet passage)

FIG. 18 is a sectional view of the plunger pump in embodiment 1 in the axial direction (valve-mounted part)

FIG. 19 plunger pump embodiment 1 water inlet and outlet direction section view

FIG. 20 axial sectional view of embodiment 2 of the plunger pump

FIG. 21 plunger pump embodiment 3 axial section view (parts without valves)

FIG. 22 is a sectional view of a plunger pump in accordance with embodiment 3 (valve-equipped member)

FIG. 23 axial section of embodiment 4 of plunger pump

FIG. 24 is an enlarged cross-sectional view of embodiment 4 of the plunger pump;

shown in the figure:

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the invention.

Embodiment 1 of pump cover 2, as pump cover 2 shown in fig. 4 and 5, has the structural characteristics that water inlet channel 202 is in a concave form, and water inlet 201 is on the side of the end face of pump cover 2.

Embodiment 2 of pump cover 2, as shown in fig. 6 and fig. 7, the position of pump cover 2 is the same as that of pump cover water inlet 201 of embodiment 1, and the pump cover water inlet channel 202 is in the form of a pipe.

Embodiment 3 of pump cover 2, as pump cover 2 shown in fig. 8 and fig. 10, pump cover water inlet channel 202 is also in the form of a pipe, and the difference lies in that pump cover water inlet 201 is located in the middle of the end face of pump cover 2, and water outlet check valve cavity 205 is located at one end of the cavity where plunger 13 is located.

As shown in fig. 10, 11 and 12, in embodiments 4, 5 and 6 of the pump cover 2, a water return cavity 210 and a pump cover water return channel 207 are added on the basis of

embodiments

1, 2 and 3 of the pump cover 2 to realize a pump cover of a dual water seal structure, that is, a support water return channel 231 is arranged on the primary water seal support 23, the pressurizing cavity 209 includes the water return cavity 210, and the water return cavity 210 is connected to the support water return channel 231 through the pump cover water return channel 207.

The pump body 1 of embodiment 1, as shown in fig. 13, is characterized in that the axis of the relief valve cavity 105 is positioned between the two pumping cavities 209, and the pump body side water inlet 102 is positioned away from the center of the circle formed by the axes of the three pumping cavities 209.

The embodiment 2 of the pump body 1, as shown in fig. 14, is characterized in that the axis of the relief valve cavity 105 is located outside the three pumping cavities 209, and the pump body side water inlet 102 is located at a position away from the center of the circle formed by the axes of the three pumping cavities 209.

The embodiment 3 of the pump body 1, as shown in fig. 15, is characterized in that the axis of the overflow valve cavity 105 is located outside the three pressurizing cavities 209, the pump body side water inlet 102 is located at the position close to the circle center formed by the axes of the three pressurizing cavities 209, and the water outlet channel 104 is close to one side of one pressurizing cavity 209;

embodiment 1 (fig. 13) of pump body 1 can be combined with embodiment 1 (fig. 4, fig. 5), embodiment 2 (fig. 6, fig. 7), embodiment 4 (fig. 10), and embodiment 5 (fig. 11) of pump cover 2 to generate 4 plunger pump embodiments; embodiment 2 (fig. 14) of pump body 1 can also be combined with embodiment 1 (fig. 4 and 5), embodiment 2 (fig. 6 and 7), embodiment 4 (fig. 10) and embodiment 5 (fig. 11) of pump cover 2 to generate 4 plunger pump embodiments; embodiment 1 of pump body 1 (fig. 15) can be combined with embodiment 3 of pump cap 2 (fig. 8, 9), embodiment 6 (fig. 12), respectively, to produce corresponding 2 plunger pump embodiments;

the above three pump cover 2 embodiments and 6 pump body 1 embodiments can produce at least 10 plunger pump embodiments.

Plunger Pump example 1

This embodiment consists of embodiment 1 of pump body 1 (fig. 13) and embodiment 1 of pump cover 2 (fig. 4, fig. 5) to illustrate the features common to the various embodiments of the plunger pump described above.

As shown in fig. 16, 17, 18 and 19, the present embodiment includes: the pump body 1 and the pump cover 2; the pump cover 2 includes: a pump cover water inlet 201, a pump cover water inlet channel 202, a pump cover water outlet channel 204, a water outlet one-way valve cavity 205, a pressurizing cavity 209 and a one-way valve water inlet 211; the pump cover water inlet 201 is connected with the pump cover water inlet channel 202, the pump cover water inlet channel 202 is connected with the one-way valve water inlet 211, the one-way valve water inlet 211 is connected with the pressurizing cavity 209, the pressurizing cavity 209 is connected with the pump cover water outlet channel 204, and the pump cover water outlet channel 204 is connected with the water outlet one-way valve cavity 205; the pump body 1 is provided with a pump body water inlet channel 101 and a pump body water outlet channel 104, the pump body water inlet channel 101 is connected with a pump cover water inlet 201, and a water outlet one-way valve cavity 205 and a pump cover water outlet interface (206) are connected with the pump body water outlet channel 104. A plunger 13 is arranged in the pump body 1, the plunger 13 is connected with a pressurizing cavity 209, and the bottom of the pressurizing cavity 209 is a water inlet one-way valve cavity 203. The water inlet check valve 27 is arranged in the water inlet check valve cavity 203, the water outlet check valve 28 is arranged in the water outlet check valve cavity 205, and the main check valve 11 is arranged in the pump body water outlet channel 104. The pump body 1 further comprises: a pump body side water outlet 102 and a pump body channel interface 103; the pump body water inlet channel 101 is connected with the pump cover water inlet 201 through the pump body side water outlet 102, the water outlet check valve 28 is connected with the pump cover water outlet interface 206, the pump cover water outlet interface 206 is connected with the pump body channel interface 103, and the pump body channel interface 103 is connected with the pump body water outlet channel 104.

As shown in fig. 19, the cavity of the main check valve 11 is communicated with an overflow valve cavity 105, the overflow valve cavity 105 is connected with an overflow channel 106, the overflow channel 106 is connected with the pump body water inlet channel 101, and an overflow valve 12 is installed in the overflow valve cavity 105.

A water seal structure is arranged on the periphery of the plunger 13, when a single water seal structure is adopted, a single water seal support 22 is arranged on the periphery of the plunger 13, and a first water seal 21 is arranged on the single water seal support 22; the pump cover 2 is provided with a screw hole 208, one side of the pump cover 2, which is opposite to the pump body 1, is provided with the water inlet cover 26, the water inlet cover 26 is fixedly connected with the pump cover 2 through a screw 29 matched with the screw hole 208, one side of the pump cover 2 connected with the water inlet cover 26 is provided with a groove, and a pump cover water inlet channel 202 is formed between the groove and the water inlet cover 26. One side of the pump body 1, which is back to the pump cover 2, is connected with an oil cylinder 30, a thrust bearing 31 and a swash plate 32 are installed in the oil cylinder 30, one side of the thrust bearing 31 is connected with the plunger 13, the other side of the thrust bearing 31 is connected with the swash plate 32, the swash plate 32 is back to one side of the plunger 13 to be connected with a connecting shaft 33, and the shaft 33 is connected with a power source 34.

Plunger Pump example 2

Plunger pump embodiment 2 is different from plunger pump embodiment 1 in that the pump body 1 is replaced with the pump body 1 shown in fig. 11 in the plunger pump embodiment 1 in that the mounting axis of the relief valve 12 of the plunger pump embodiment 2 is located outside the circle formed by the centers of the three pressurizing chambers 209.

The

plunger pump embodiments

1 and 2 have the common feature that, as shown in fig. 18, 19 and 20, the three water outlet check valve cavities 205 are located on one side of the two pressurizing cavities 209, and the pump cover water inlet 201 is arranged at a position far away from the circle center formed by the three pressurizing cavities 9. Correspondingly, the pump body side water outlet 102 is arranged away from the center of the circle formed by the three pressurizing chambers 9.

Plunger Pump example 3

As shown in fig. 21, 22 and 23, unlike the

plunger pump embodiments

1 and 2, three water outlet check valve cavities 205 are located at one side of one pressurizing cavity 209, and a pump cover water inlet 201 is arranged at the position of the center of a circle formed by the three pressurizing cavities 9; correspondingly, the pump body side water outlet 102 is arranged at the position of the center of the circle formed by the three pressurizing chambers 9.

Plunger Pump example 4

On the basis of the plunger pump embodiments 1-3, the single water seal cover is replaced by the double water seal cover, and the double water seal consists of a first water seal 21 and a second water seal 24; correspondingly, an auxiliary water seal mounting chamber 232 is designed between the main water seal support 23 and the auxiliary water seal support 25, the second water seal 24 is mounted in the auxiliary water seal mounting chamber, and the main water seal support 23 is provided with a support backwater channel 231 and an O-shaped ring groove; correspondingly, the pump cover 2 is provided with a pump cover backwater channel 207; the second water seal 24 and the O-ring prevent the micro water seepage carried out by the first water seal 21 from being discharged outside the pump, and the micro water seepage flows back to the pump cover water inlet 201 through the pump cover water return channel 207 and the support water return channel 231.

Plunger Pump example 5

In the embodiments 1-4 of the plunger pump, the outlet check valve 28 can be assembled in the pump cover 2 by adding threads on the plug, or the plug can be fixed by a bolt or the check valve support 22 combined with the plug is adopted.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description has described specific embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A plunger pump, comprising: the pump comprises a pump body (1) and a pump cover (2);

the pump body (1) is connected with the pump cover (2);

the pump cover (2) includes: the pump cover water inlet (201), the pump cover water inlet channel (202), the pump cover water outlet channel (204), the water outlet one-way valve cavity (205), the pressurizing cavity (209), the water outlet one-way valve cavity communicating hole (212) and the one-way valve water inlet (211);

the pump cover water inlet (201) is connected with the pump cover water inlet channel (202), the pump cover water inlet channel (202) is connected with the one-way valve water inlet (211), the one-way valve water inlet (211) is connected with the pressurizing cavity (209), the pressurizing cavity (209) is connected with the pump cover water outlet channel (204), and the pump cover water outlet channel (204) is connected with the water outlet one-way valve cavity (205) through a pump cover water outlet interface (206);

the bottom of the pressure increasing cavity (209) is provided with a water inlet one-way valve cavity (203), a plurality of water inlet one-way valves (27) are arranged in the water inlet one-way valve cavity (203), a plurality of water outlet one-way valve cavities (205) are communicated through a water outlet one-way valve cavity communication hole (212), and a water outlet one-way valve (28) is arranged in the water outlet one-way valve cavity (205);

the pump body (1) is provided with a pump body water inlet channel (101) and a pump body water outlet channel (104), the pump body water inlet channel (101) is connected with the pump cover water inlet (201), and the water outlet one-way valve cavity (205) is connected with the pump body water outlet channel (104) through a pump cover water outlet interface (206).

2. The plunger pump of claim 1, wherein: the pump body (1) is provided with a plurality of axial holes, a plunger (13) is installed in each axial hole, the plunger (13) axially faces towards one end of the pump cover (2) and is connected with the pressurizing cavity (209), and a main check valve (11) is installed in the pump body water outlet channel (104).

3. Plunger pump according to claim 2, characterized in that the pump body (1) further comprises: a pump body side water outlet (102) and a pump body channel interface (103);

the pump body water inlet channel (101) is connected with the pump cover water inlet (201) through a pump body side water outlet (102);

the water outlet one-way valve (28) is connected with a pump cover water outlet interface (206), the pump cover water outlet interface (206) is connected with the pump body channel interface (103), and the pump body channel interface (103) is connected with the pump body water outlet channel (104).

4. The plunger pump of claim 3, wherein: the main check valve (11) is connected with an overflow valve cavity (105), the overflow valve cavity (105) is connected with an overflow channel (106), and the overflow channel (106) is connected with the pump body water inlet channel (101);

an overflow valve (12) is arranged in the overflow valve cavity (105).

5. The plunger pump of claim 1, wherein: a water seal structure is arranged on the peripheral side of the plunger (13), the water seal structure is arranged in the pressurizing cavity (209), and the water seal structure comprises a single water seal structure and a double water seal structure;

when a single water seal structure is adopted, a single water seal support (22) is arranged on the periphery of the plunger (13), and a first water seal (21) is arranged on the single water seal support (22);

when adopting two water seal structures, plunger (13) week side installation main water seal support (23) and vice water seal support (25), main water seal support (23) are connected vice water seal support (25) and with form vice water seal installation chamber (232) between vice water seal support (25), the first water seal of main water seal support (23) side-mounting (21), vice water seal installation chamber (232) department installation second water seal (24).

6. The plunger pump of claim 5, wherein: set up support return water channel (231) on main water seal support (23), pressure boost chamber (209) are including return water chamber (210), return water chamber (210) are connected through pump cover return water channel (207) support return water channel (231).

7. The plunger pump of claim 1, wherein: the pump cover (2) is provided with a screw hole (208), one side of the pump cover (2), which is opposite to the pump body (1), is provided with a water inlet cover (26), and the water inlet cover (26) is matched with the screw hole (208) through a screw (29) and is fixedly connected with the pump cover (2);

the pump cover (2) is connected one side of the water inlet cover (26) is provided with a groove, and the groove and the water inlet cover (26) form the pump cover water inlet channel (202).

8. The plunger pump of claim 1, wherein: one side, back to the pump cover (2), of the pump body (1) is connected with an oil cylinder (30), and a thrust bearing (31) and a swash plate (32) are installed in the oil cylinder (30);

thrust bearing (31) one side is connected plunger (13), and the opposite side is connected swash plate (32), swash plate (32) dorsad plunger (13) one side connecting axle (33), power supply (34) are connected in axle (33).

9. A high pressure cleaner, its characterized in that: the high-pressure washer adopts the plunger pump of any one of claims 1-8.