CN210788332U

CN210788332U - Pressure washer and pump thereof

Info

Publication number: CN210788332U
Application number: CN201920561066.6U
Authority: CN
Inventors: 乔勇; 王其彬; 高昌印
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-06-19
Anticipated expiration: 2029-04-23

Abstract

The application relates to a pump, which comprises a pump body, wherein the pump body comprises a water inlet cavity, a water outlet cavity, a high-pressure cavity and a water outlet one-way valve, the water outlet one-way valve comprises a first valve body and a first valve core, the first valve body is provided with a first liquid flow channel penetrating through the first valve body and a first opening which is arranged along the circumferential direction of the first valve body and is communicated with the first liquid flow channel; the first valve core is movably arranged in the first liquid flow channel; the first valve core is in an overflowing position, and liquid can flow out of the first liquid flow channel through the first opening; the side wall of the water outlet cavity is provided with a plurality of hollow areas for liquid to flow out, corresponding to the first opening. According to the pump, when the valve core is at the overflowing position, water flow is guided out through the opening along the liquid flow channel, and due to the fact that the part, corresponding to the first opening, of the side wall of the water outlet cavity is provided with the plurality of hollow areas for liquid to flow out, the water flow flows out without obstruction and cannot be blocked by the side wall of the water outlet cavity, and therefore water flow is increased. A pressure washer and pump therefor are also provided.

Description

Pressure washer and pump thereof

Technical Field

The utility model relates to a cleaning equipment field especially relates to a pressure washer and pump thereof.

Background

In home life and outdoor activities, the need for cleaning has been widespread. In the home life centered on the home yard, people often need to clean balconies, walkways, outdoor tables and chairs, barbecue grills, cars, bicycles, garages, pets, garden tools, windows, swimming pools, outdoor steps, etc. Because the using scene of the articles is outside the house, the articles are inevitably stained with dirt, oil stains, leaves, accumulated dust and other stains, and the cleaning by using the rag is very inconvenient.

In order to meet the requirements, a pressure cleaning machine is provided on the market, water at a water source can be sprayed out after being pressurized by a pump in the pressure cleaning machine, so that the pressure cleaning machine can be used for cleaning balconies, automobiles, doors and windows, courtyard roads and the like, and is efficient and convenient. The water source of the pressure washer is different for different application scenarios, different cleaning locations and different cleaning requirements, for example, the water source of the pressure washer may be a pond, a faucet or any container capable of storing water. However, when different water sources are adopted, the difference of the water outlet flow of the pressure cleaning machine is large, and the working efficiency of the pressure cleaning machine is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a pressure washer and a pump thereof to solve the problem of large difference in water flow rate when the conventional pressure washer adopts different water sources.

A pump comprising a pump body, the pump body comprising:

a water inlet cavity;

a water outlet cavity; and

the high-pressure chamber is communicated with the water inlet cavity and the water outlet cavity;

the pump body still includes the check valve of going out water that is used for switching on or blocking high pressure chamber with go out the water cavity, go out water check valve and include:

the first valve body is provided with a first liquid flow channel penetrating through the first valve body and a first opening which is arranged along the circumferential direction of the first valve body and is communicated with the first liquid flow channel;

a first valve spool movably disposed within the first fluid flow channel; the first valve core is provided with a flow stopping position and an overflowing position, the first valve core is in the flow stopping position, the first valve core closes the first liquid flow channel, the first valve core is in the overflowing position, and liquid can flow out of the first liquid flow channel through the first opening;

the side wall of the water outlet cavity is provided with a plurality of hollow areas for liquid to flow out, corresponding to the first opening.

The pump has the advantages that when the valve core is located at the overflowing position, water flow is guided out through the opening along the liquid flow channel, and the part, corresponding to the first opening, of the side wall of the water outlet cavity is provided with the plurality of hollow areas for liquid to flow out, so that the water flow flows out without obstruction and cannot be blocked by the side wall of the water outlet cavity, water flow is increased, the difference of the pressure washer on the standby pressure water source and the water flow of the self-suction water source is reduced, the cleaning effect and the cleaning range of the self-suction water source are improved, and user experience is improved.

In one embodiment, the pump body further comprises a positioning part as a side wall of the water outlet cavity;

the water outlet cavity is provided with a plurality of water outlet cavities, the positioning parts are also provided with a plurality of fixing positions for positioning the first valve body, and the hollow areas are defined between the adjacent positioning parts.

In an embodiment, the positioning portions include a first type positioning portion and a plurality of second type positioning portions;

the plurality of second type positioning portions are arranged around the first type positioning portion, and a plurality of fixing positions are formed between the first type positioning portion and the plurality of second type positioning portions.

In one embodiment, the first liquid flow channel has a liquid inlet and a liquid outlet, the first valve core has a first valve surface facing the liquid inlet, the valve core is in a flow stop position, and the first valve surface blocks the liquid inlet;

the first valve face comprises a first surface for blocking the liquid inlet and a second surface which is inclined relative to the first surface and faces away from the liquid inlet, and the second surface is arranged around the first surface.

In one embodiment, the pump body further comprises a water collection chamber in communication with the plurality of water outlet chambers.

In one embodiment, the pump body further includes a water inlet check valve that opens or closes the high pressure chamber and the water inlet chamber, the water inlet check valve including:

the second valve body is provided with a second liquid flow passage penetrating through the second valve body and a second opening which is arranged along the circumferential direction of the second valve body and is communicated with the second liquid flow passage;

the second valve core is movably arranged in the second liquid flow channel; the second valve core has a flow stop position and an overflow position, the second valve core is in the flow stop position, the second valve core closes the second liquid flow passage, the second valve core is in the overflow position, and liquid can flow out of the second liquid flow passage through the second opening;

the maximum inner diameter of the part, corresponding to the second valve body, of the water inlet cavity, provided with the second opening, is larger than the outer diameter of the second valve body, so that a water outlet gap for liquid with preset flow can be defined.

In one embodiment, the cross-sectional area of the inlet chamber is greater than the cross-sectional area of the second valve body during movement of the second valve spool from the flow-stop position to the flow-passing position.

In one embodiment, the pump further comprises at least one plunger, each plunger having one end connected to the high pressure chamber and the other end connected to a transmission mechanism for converting rotary motion into reciprocating motion;

the plunger is driven in a reciprocating motion to alternately compress or release the high pressure chamber.

A pressure washer incorporating a pump as in the previous embodiments, the pressure washer comprising a motor for generating power, the transmission connecting the motor and the plunger.

In one embodiment, the pressure washer is powered by direct current and can be connected to an external water source through a water pipe;

the pressure washer further includes:

the motor, the transmission mechanism and the pump are arranged in the shell;

a handle for gripping; and

and the water of the external water source can be sprayed out of the spray head after being pressurized by the pump.

Drawings

Fig. 1 is a schematic structural view of a pressure washer according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of the pressure washer shown in FIG. 1;

fig. 3 is a schematic structural diagram of a pump body according to an embodiment of the present invention;

FIG. 4 is a schematic view of the pump body of FIG. 3 from another perspective;

FIG. 5 is a schematic cross-sectional view of the pump body shown in FIG. 3;

fig. 6 is a schematic structural view of a water outlet check valve according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a first valve core of the outlet check valve shown in FIG. 6;

fig. 8 is a schematic view illustrating a fitting relationship between the water inlet check valve and the pump body according to an embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

When an element is referred to as being connected to another element, it can be directly connected to the element or intervening elements may also be present, unless otherwise specified. Further, when an element is referred to as being "between" two elements, it can be the only one between the two elements, or one or more intervening elements may also be present.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention.

Conventional pressure washers typically have a main body and spray heads connected to the main body. The water tank, the motor and the pump are arranged on the main machine, the trigger starting switch for spraying water is arranged on the spray head, and water at the water source can be sprayed out through the spray head after being pressurized by the pump in the pressure cleaning machine. These pressure washers are bulky, heavy, and cumbersome to transport when switched between work scenarios. For example, during a home cleaning day, if windows, driveways, steps, cars need to be washed one by one, the pressure washer is transported back and forth between different locations. In addition, before the pressure washer is used, water needs to be added into the water tank, and the operation is not simple enough.

Due to the requirements of carrying convenience and using convenience, another pressure cleaning machine is available on the market, wherein one end of a garden hose is connected with an external water source, and the other end of the garden hose is connected with the pressure cleaning machine. Among them, the external water source may be classified into two types, one is a water source having a certain water pressure itself, also called a back-up pressure water source, such as a tap water source; another is a water source that is not itself pressurized, also known as a self-priming water source, such as a lake, pond, ditch, or a water source provided by a container like a tank or cylinder.

Considering that the working scenes of the pressure washer are generally household cleaning and outdoor cleaning, in order to meet the requirements of portability and convenience in use, the pressure washer needs to balance the relationship among the weight of the whole machine, the washing range, the working water pressure, the water flow and the like. However, for different water sources, the difference between the working water pressure and the water flow is large, for example, when the external water source is tap water, since the tap water has a certain pressure, compared with the water sources in a pond, a water tank or other containers, the difference between the working water pressure and the water flow is large, and the cleaning range, the cleaning effect and the user experience are affected.

Therefore, it is necessary to provide a pressure washer and a pump thereof that can solve the problem of large difference between the working water pressure and the water flow rate of the self-priming water source and the backup water source.

The pressure washer of the present invention will be described with reference to the accompanying drawings.

Fig. 1 shows a schematic structural diagram of a pressure washer according to an embodiment of the present invention; fig. 2 shows a partial schematic of the pressure washer shown in fig. 1. For the purpose of illustration, only the structures associated with the present invention are shown in the drawings.

Referring to the drawings, in the pressure washer 10 according to an embodiment of the present invention, the pressure washer 10 is a hand-held pressure washer, and is powered by a dc power source and can be connected to an external water source through a water pipe. Of course, in other embodiments, the pressure washer 10 may be a pedestal pressure washer, or may be powered by ac, which is not limited herein.

The pressure cleaning machine 10 comprises a motor 11, a transmission mechanism 13 connected with the motor 11, a handle 14, a pump 15 driven by the transmission mechanism 13, a battery pack 16 and a spray head 18 communicated with a water outlet of the pump 15. In particular, the pressure washer 10 further comprises a casing 12 housing the aforementioned motor 11, pump 15, transmission 13, and a handle 14 formed on or connected to said casing. A trigger, in particular a trigger, is provided adjacent the handle 14 for triggering the water spray action outwardly. The pump 15, the gear 13 and the motor 11 form functional components of the pressure washer 10.

The pressure washer 10 itself does not include a water tank and may be connected to a water line at the water inlet end and then connected to an external water source by a water line. Thus, after the water inlet port is connected with the water pipe, in household activities, a user can hold the pressure cleaning machine 10 by only connecting the tail end of the water pipe with a water faucet or putting the water pipe into external water sources such as lakes, ponds, buckets and the like, and can freely move within the length range of the water pipe to perform water spraying cleaning work. In outdoor activities, a user only needs to stop at a place with water at any time and put the tail end of the water pipe into an external water source, and then water spraying cleaning work can be carried out. The pump 15 is capable of sucking water from an external water source into the pressure washer 10 and then ejecting the water from the head 18.

The pump 15, the transmission 13 and the motor 11 among the functional components are arranged in sequence from front to back. As a specific embodiment, all or part of the pump 15, the transmission 13 and the motor 11 among the functional components are arranged in parallel with the front end of the handle 14. The pump 15 includes a housing 152, a plunger 156, and a pump body 158. The housing 152 is a sealed housing 152, and has a water inlet and a water outlet formed on the surface of the housing 152, and a connection port for connecting the transmission mechanism 13. The water inlet is adapted to be connected to, for example, a water pipe, a water gun, to introduce a flow of water from an external source into the interior of the pump, and the water outlet is adapted to communicate with the spray head 18 of the pressure washer 10 to be sprayed from the spray head 18 after the flow of water is pressurized within the interior of the pump.

Fig. 3 shows a schematic structural diagram of the pump body 158 according to an embodiment of the present invention; FIG. 4 is a schematic diagram illustrating another perspective of the pump body 158 of FIG. 3; FIG. 5 illustrates a cross-sectional schematic view of the pump body 158 shown in FIG. 3; fig. 6 is a schematic structural view of a water outlet check valve according to an embodiment of the present invention.

Referring to fig. 3-5, in some embodiments, the pump body 158 includes an intake cavity 1580, an outlet cavity 1582 (see fig. 5), and a high pressure chamber 1583 (see fig. 4), the high pressure chamber 1583 communicating the intake cavity 1580 and the outlet cavity 1582 for allowing water from an external source to enter from the intake cavity 1580. The plunger 156 comprises at least one hollow high-pressure chamber 1583, and at least one hollow high-pressure chamber 1583, one end of each plunger 156 is connected with one high-pressure chamber 1583, the other end of each plunger 156 is connected with a transmission mechanism 13 for converting the rotary motion of the motor 11 into reciprocating motion, the reciprocating motion driven by the plunger 156 is used for alternately squeezing or releasing the high-pressure chamber 1583, and water can be finally discharged from the water outlet chamber 1582 after being pressurized by the plunger 156 in the high-pressure chamber 1583.

Specifically, the plunger 156 is sealingly and at least partially received in a high pressure chamber 1583, the high pressure chamber 1583 extending along a length of the plunger 156, the plunger 156 pressurizing the water stream as it reciprocates in that direction. The water inlet cavity 1580 and the water outlet cavity 1582 are respectively connected with the high-pressure chamber 1583 through corresponding holes, for example, as shown in fig. 4, the water inlet cavity 1580 is communicated with the high-pressure chamber 1583 through a hole 1585. The water inlet cavity 1580 is further connected with a water inlet, an external water source can enter the water inlet cavity 1580 from the water inlet, the water outlet cavity 1582 is connected with a water outlet, and pressurized high-pressure water flow can be discharged from the water outlet and enters the sprayer 18.

In the embodiment of the present application, the pump body 158 further includes a water outlet check valve 17 for communicating or blocking the high pressure chamber 1583 and the water outlet chamber 1582, and a water inlet check valve 19 for communicating or blocking the high pressure chamber 1583 and the water inlet chamber 1580. The water inlet check valve 19 is used for controlling the on-off of the water inlet cavity 1580 and the high-pressure cavity 1583, when the water inlet check valve 19 is opened, water in the water inlet cavity 1580 can flow into the high-pressure cavity 1583 to be pressurized, and due to the one-way conduction effect of the check valve, the water in the high-pressure cavity 1583 cannot flow back into the water inlet cavity 1580, namely the water inlet check valve 19 can only control the water to flow from the water inlet cavity 1580 to the high-pressure cavity 1583. When the water inlet check valve 19 is closed, water in the water inlet cavity 1580 cannot enter the high-pressure chamber 1583, and the water inlet cavity 1580 and the high-pressure chamber 1583 form a partition. Accordingly, when the water outlet one-way valve 17 is opened, the water in the high-pressure chamber 1583 can flow to the water outlet chamber 1582, and has a one-way communication function. When the outlet check valve 17 is closed, the water in the high-pressure chamber 1583 cannot flow to the outlet chamber 1582, and the water is accumulated in the high-pressure chamber 1583, so that the plunger 156 can pressurize the water in the high-pressure chamber 1583.

In some embodiments, a plunger 156 in the high pressure chamber 1583 is used to control the opening and closing of the outlet check valve 17 and the inlet check valve 19. In particular, the plunger 156 may simultaneously control the outlet check valve 17 to open, and at this time the inlet check valve 19 to close. The plunger 156 may also simultaneously control the outlet check valve 17 to close and the inlet check valve 19 to open. That is, the plunger 156 may simultaneously control the outlet check valve 17 and the inlet check valve 19 to be in different states of being opened or closed, respectively. For example, the plunger 156 begins to move from a first end to a second end of the high pressure chamber 1583. At this time, the inlet check valve 19 is opened, and at this time, the outlet check valve 17 is closed. The water flow thus enters the high pressure chamber 1583 from the inlet chamber 1580 and does not exit the high pressure chamber 1583, the water being accumulated within the high pressure chamber 1583. Then the plunger 156 moves from the second end to the first end, at this time, the inlet check valve 19 is closed, the outlet check valve 17 is opened, water cannot be supplemented from the inlet cavity 1580 into the high-pressure chamber 1583, and water originally located in the high-pressure chamber 1583 is pressed by the plunger 156 to generate high pressure, and flows to the outlet cavity 1582 to be sprayed out from the outlet to the spray head 18.

It should be noted that the structure of the outlet check valve 17 is similar to that of the inlet check valve 19, and for convenience of description, the outlet check valve 17 will be described below with emphasis on the example.

In the embodiment of the present application, referring to fig. 3, 5 and 6, the outlet check valve 17 includes a first valve body 172 and a first valve core 174, the first valve body 172 has a first fluid passage extending through the valve body, and a first opening 176 disposed along a circumferential direction of the first valve body 172 and communicating with the first fluid passage; the first valve spool 174 is movably disposed within the first flow passage, the first valve spool 174 having a flow stop position and an excess flow position, the first valve spool 174 being in the flow stop position, the first valve spool 174 closing the first flow passage, the first valve spool 174 being in the excess flow position, fluid being able to flow from the first flow passage through the first opening 176.

The side wall of the water outlet cavity 1582 corresponding to the first opening 176 has a plurality of hollow areas for liquid to flow out. Thus, when the first valve core 174 is at the overflowing position, the water flow is guided out through the first opening 176 along the first fluid flow channel, and since the part of the side wall of the water outlet cavity 1582 corresponding to the first opening 176 has a plurality of hollow areas for the liquid to flow out, the water flow continues to flow out without hindrance, and thus cannot be blocked by the side wall of the water outlet cavity 1582, the water flow is increased, the difference of the water flow of the pressure washer 10 for the pressure water source and the self-priming water source is reduced, the washing effect and the washing range of the self-priming water source are further improved, and the user experience is improved.

In some embodiments, the pump body 158 further includes a plurality of positioning portions serving as sidewalls of the water outlet cavity 1582, the plurality of positioning portions form a plurality of fixing positions for positioning the first valve body 172, and the adjacent positioning portions define the aforementioned hollow area. Like this, can fix a position first valve body 172 to avoid it to take place to become flexible because of the location is not enough and cause and leak, and define out the fretwork area between the adjacent location portion, make as far as possible increase out the water flow when guaranteeing to go out water check valve 17 location. Further, the plurality of positioning columns include a first type positioning portion 1586 and a plurality of second type positioning portions 1588, the plurality of second type positioning portions 1588 are arranged around the first type positioning portion 1586, and a plurality of fixing positions are formed between the first type positioning portion 1586 and the plurality of second type positioning portions 1588. Specifically, the positioning portion is columnar, the first type positioning portion 1586 is arranged in the center, the plurality of second type positioning portions 1588 are arranged around the first type positioning portion 1586 along the circumferential direction, and form a plurality of fixing positions with the first type positioning portion 1586, and each fixing position corresponds to one water outlet cavity 1582. It is easy to understand that, since each first valve body 172 is supported and positioned by the first type positioning portion 1586 and the second type positioning portion 1588, and the first type positioning portion 1586 and the second type positioning portion 1588 are arranged at intervals, the hollow area can be defined, so as to achieve the effect of increasing the water flow.

Specifically, in one embodiment, as shown in fig. 3, there are three water outlet cavities 1582, each water outlet cavity 1582 has a circular cross section, the first type positioning portion 1586 serves as a common portion of the three water outlet cavities 1582, and each water outlet cavity 1582 corresponds to two second type positioning portions 1588. A fixing position is formed between every two second-type positioning portions 1588 and the first-type positioning portion 1586.

In some embodiments, the pump body 158 further includes a water collection chamber (not shown) in communication with the plurality of water exit chambers 1582. Specifically, the water collection chamber can collect the water flowing out of the plurality of water outlet chambers 1582 and connect with the water outlet pipe, so that the water can be finally sprayed out from the spray head.

In some embodiments, the first flow channel has an inlet port and an outlet port, the first valve spool 174 has a first valve face facing the inlet port, the first valve spool 174 is in a flow stop position, and the first valve face blocks the inlet port. Wherein the first valve face comprises a first surface 1742 for blocking the liquid inlet, and a second surface 1744 arranged obliquely with respect to the first surface 1742 towards a direction facing away from the liquid inlet, the second surface 1744 being arranged around the first surface 1742. Correspondingly, a mating surface is disposed within the first fluid passageway that mates with second surface 1744 and is disposed about the fluid inlet. It will be appreciated that since the second surface 1744 is inclined with respect to the first surface 1742, the contact area between the first valve core 174 and the inner wall of the first fluid passage is increased, and the one-way blocking performance of the water flow can be ensured when the valve core is in the flow stop position. In addition, when the first valve spool 174 is in the flow passing position, a drain path is created that directs water out to the first opening 176, thereby further increasing the flow of water.

In some embodiments, the outlet check valve 17 further includes a first elastic member 178, the first elastic member 178 is disposed in the first fluid passage, and the first elastic member 178 is used for applying an elastic force to the first valve spool 174 to maintain the flow stop position. For example, when the plunger 156 moves from the second end to the first end, the first elastic member 178 generates an elastic force to close the outlet chamber 1582 by the outlet check valve 17. As the plunger 156 moves from the first end to the second end, the volume of the water flow in the high-pressure chamber 1583 gradually increases, so that the outlet check valve 17 is opened against the elastic force of the elastic member, that is, the outlet check valve 17 is changed from the closed state to the open state.

Fig. 8 is a schematic view illustrating the fitting relationship between the water inlet check valve 19 and the pump body 158 according to an embodiment of the present invention.

Similarly, the inlet check valve 19 includes a second valve body 192 and a second valve core 194, the second valve body 192 has a second fluid passage passing through the second valve body 192, and a second opening (not shown) disposed circumferentially along the second valve body 192 and communicating with the second fluid passage, and the second valve core 194 is movably disposed in the second fluid passage. The second spool 194 has a flow stop position and an overflow position, the second spool 194 being in the flow stop position, the second spool 194 closing off the second flow passage, the second spool 194 being in the overflow position, liquid being able to flow out of the second flow passage through the second opening. In the embodiment of the present application, the maximum inner diameter of the portion of the water inlet chamber 1580 corresponding to the second valve body 192 where the second opening is provided is larger than the outer diameter of the second valve body 192, so as to define the water outlet gap 198 capable of passing through the liquid with the preset flow rate.

Thus, when the second valve core 194 is located at the overflowing position, the water flow is guided out through the second opening along the second flow channel, and because the water outlet gap 198 which increases the overflowing area compared with the prior art is formed between the part of the second valve body 192 provided with the second opening and the side wall of the water inlet cavity 1580, the water flow continues to enter the high-pressure cavity 1583 without hindrance, so that the water flow is increased, the difference between the water flow of the pressure washer 10 for the backup pressure water source and the water flow of the self-priming water source is reduced, the cleaning effect and the cleaning range of the self-priming water source are improved, and the user experience is improved.

It should be noted that the conventional inlet chamber 1580 has an inner diameter substantially equal to the outer diameter of the second valve body 192 and a small flow area, but in the present application, the gap between the portion of the second valve body 192 where the second opening is provided and the sidewall of the inlet chamber 1580 is increased, so that a larger flow rate of water can be passed. The predetermined flow rate is a flow rate greater than the flow rate allowed to pass between the conventional inlet chamber 1580 and the second valve body 192.

It should also be noted that in some embodiments, the inner diameter of the inlet chamber 1580 is not uniform, for example, the inner diameter of the inlet chamber 1580 may be substantially the same as the inner diameter of the second valve body 192 over a range of circumferential angles relative to a central axis of the inlet chamber 1580. Specifically, in the embodiment, the outer diameter of the portion of the second valve body 192 not opened with the second opening is substantially the same as the inner diameter of the water inlet chamber 1580. In this way, the second valve body 192 is ensured to be stably disposed within the inlet chamber 1580.

In some embodiments, the inlet check valve 19 further includes a second resilient member 196, the second resilient member 196 is disposed in the second fluid passage, and the second resilient member 196 is used for applying a resilient force to the second valve spool 194 to maintain the flow-stopping position. The direction of the one-way valve of the inlet check valve 19 and the direction of the restoring force of the second elastic member 196 are opposite to the direction of the one-way valve of the outlet check valve 17 and the direction of the restoring force of the first elastic member 178. Therefore, as the plunger 156 moves from the first end to the second end, the water flow pressure against the second elastic member 196 is less and less, and finally the inlet chamber 1580 is closed by the inlet check valve 19 under the action of the second elastic member 196, i.e. the inlet check valve 19 is changed from the open state to the closed state.

It is understood that the high pressure chamber 1583, the inlet chamber 1580 and the outlet chamber 1582 may be one, two or more, and are not limited thereto.

In some embodiments, the cross-sectional area of the inlet chamber 1580 is greater than the cross-sectional area of the second valve body 192 during movement of the second spool 194 from the flow stop position to the flow passing position. Further, in the prior art, the inner diameter of the inlet chamber 1580 is substantially equal to the inner diameter of the second valve body 192, and the corresponding cross-sectional area of the inlet chamber 1580 is substantially equal to the cross-sectional area of the second valve body 192. In the embodiment of the present application, due to the arrangement of the water outlet gap 198, the cross-sectional area of the water inlet cavity 1580 is larger than that of the second valve body 192, so that the flow interception area of the water flow is increased compared with the prior art, and the water flow is increased.

It should be noted that the position of the first valve spool 174 and the second valve spool 194 in the embodiment of the present application is not a specific position, but refers to a position where the valve spools are capable of flowing liquid from the liquid inlet of the flow channel during movement along the flow channel. The position may refer to a range, for example, as shown in the figure, the second valve element 194 is located at the uppermost end of the second flow path, and the position is the flow stop position of the second valve element 194, and the second valve element 194 may be regarded as an overflow position during the movement from the uppermost end to the lowermost end of the second flow path.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A pump comprising a pump body, the pump body comprising:

a water inlet cavity;

a water outlet cavity; and

characterized in that, the pump body still includes and is used for switching on or blocking the high pressure cavity with go out the water check valve of water cavity, it includes to go out the water check valve:

2. The pump of claim 1, wherein the pump body further comprises a locating portion as a sidewall of the exit chamber;

3. The pump of claim 2, wherein the plurality of detents comprises a first type detent and a plurality of second type detents;

4. The pump of claim 1, wherein the first flow channel has an inlet port and an outlet port, the first valve element has a first valve face facing the inlet port, the valve element is in a flow stop position, and the first valve face blocks the inlet port;

5. The pump of any of claims 1 to 4, wherein the pump body further comprises a water collection chamber in communication with the plurality of water outlet chambers.

6. The pump of claim 1, wherein the pump body further comprises a water inlet check valve that opens or blocks the high pressure chamber and the water inlet chamber, the water inlet check valve comprising:

7. The pump of claim 6, wherein the cross-sectional area of the inlet chamber is greater than the cross-sectional area of the second valve body during movement of the second valve spool from the flow-stop position to the flow-passing position.

8. The pump of any one of claims 1 to 4, further comprising at least one plunger, each plunger having one end connected to the high pressure chamber and the other end connected to a transmission mechanism for converting rotary motion to reciprocating motion;

9. A pressure washer employing the pump of claim 8, wherein said pressure washer includes a motor for generating power, said transmission connecting said motor and said plunger.

10. The pressure washer according to claim 9, wherein the pressure washer is powered by direct current and is connectable to an external water source via a water pipe;

the pressure washer further includes:

the motor, the transmission mechanism and the pump are arranged in the shell;

a handle for gripping; and