CN216419839U - Negative pressure type spraying machine - Google Patents

Abstract

The utility model discloses a negative pressure formula flush coater for spout coating liquid. The negative pressure type spraying machine comprises a machine body, a plunger pump, a power supply device and a liquid storage bag, wherein the liquid storage bag comprises a soft bag body used for containing the liquid material and a liquid supply interface arranged on the soft bag body, the liquid supply interface of the liquid storage bag is suitable for being communicated with a liquid inlet of the plunger pump, when the plunger pump is in a negative pressure working state, negative pressure is formed in the plunger pump and used for sucking the liquid material out of the liquid storage bag through negative pressure, so that the soft bag body of the liquid storage bag is deflated due to the fact that the liquid material is sucked out through the negative pressure, when the plunger pump is in a positive pressure working state, positive pressure is formed in the plunger pump and used for pressurizing the liquid material sucked out through the negative pressure, the pressurized liquid material flows through a high-pressure atomizing nozzle from a liquid outlet of the plunger pump and is sprayed out, spraying quality is improved, and spraying efficiency is improved.

Description

Negative pressure type spraying machine

Technical Field

The utility model relates to a spraying technical field especially relates to negative pressure formula flush coater.

Background

In the prior art, compressed air spraying is generally adopted to replace the traditional rolling and brushing processes for spraying liquid paint or emulsion paint, but due to the fact that compressed air contains impurities such as water, oil and the like, spots or bubbles appear on a spraying surface in the spraying mode, and the spraying quality is poor and the spraying efficiency is low. At present, high-pressure airless spraying machines appear in the market, and generally a booster pump is adopted to pressurize the coating, and then the coating is sprayed out through a very thin spray hole on the spraying machine to form fan-shaped fog. Although the airless sprayer solves the problems of the airless sprayer, the air pressure in the storage bottle is reduced along with the use of the feed liquid, so that the feed liquid is difficult to be sucked into the pump, and the storage bottle is provided with the balance hole, so that the external air can enter the storage bottle to balance the air pressure inside and outside the bottle, and the air pressure in the storage bottle is always equal to the external atmospheric pressure. However, the balance hole on the storage bottle is not only easy to spill the feed liquid to cause pollution, but also easy to be blocked by the feed liquid to lose the function of balance air pressure.

In addition, since the plunger pump as an addition is basically installed above the storage bottle and sucks the feed liquid into the pump through a suction pipe extending into the bottom of the bottle, on one hand, the plunger pump needs a larger suction force to overcome the self weight of the coating, which consumes more electric energy and affects the working efficiency; on the other hand, once the spraying angle of the airless sprayer is too large in the using process, the material liquid in the storage bottle can be gathered at the bottle opening part, so that the suction pipe opening extending into the bottle bottom is exposed out of the material liquid, the material liquid in the storage bottle cannot be continuously sucked into the pump, and further the air is mixed to ensure that the sprayed coating can be discontinuous, so that the poor spraying quality and the low spraying efficiency are caused. That is, the conventional airless sprayer is only suitable for spraying a vertical surface such as a wall, but is not suitable for spraying a horizontal surface such as a ceiling or a floor due to the limitation of the spraying angle.

Particularly, when the amount of the feed liquid in the storage bottle is small, air is mixed in the feed liquid sucking process of the existing airless sprayer, so that the sprayed feed liquid is intermittent, and the spraying quality is seriously affected. In order not to affect the spraying quality, workers often supplement new liquid or replace a new storage bottle when a certain amount of liquid still remains in the storage bottle, which not only reduces the spraying efficiency, but also increases the spraying cost. In fact, the viscous material liquid is often adhered to the inner wall of the storage bottle and cannot be fully utilized, thereby causing resource waste. In addition, the suction tube of the conventional airless sprayer may cause severe dripping of the coating liquid after the storage bottle is released, thereby causing pollution to the working environment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an advantage lies in providing negative pressure formula flush coater, and it can improve the spraying quality, improves spraying efficiency.

Another advantage of the present invention is to provide a negative pressure type sprayer, wherein, in an embodiment of the present invention, the negative pressure type sprayer can adopt the liquid storage bag to supply the feed liquid so as to carry out the negative pressure imbibition, reduce the power loss.

Another advantage of the present invention is to provide a negative pressure type sprayer, wherein, in an embodiment of the present invention, the negative pressure type sprayer can utilize the liquid storage bag realizes airless liquid supply to sneak into the air in avoiding the feed liquid, help improving the spraying quality.

Another advantage of the utility model is to provide a negative pressure formula flush coater, wherein the utility model discloses an in, in the negative pressure formula flush coater the soft bag of liquid storage bag can become flat along with the negative pressure suction of interior feed liquid of bag to avoid the air to sneak into the feed liquid, help realizing the even spraying of feed liquid.

The utility model discloses a negative pressure formula flush coater is provided to another advantage, wherein the utility model discloses an in the embodiment, negative pressure formula flush coater can utilize outside atmospheric pressure to come automatic extrusion at the in-process of spraying paint liquid the liquid reserve bag the soft bag body for the feed liquid gathering that adheres on the bag inner wall is in near the confession liquid interface of liquid reserve bag, the make full use of feed liquid of being convenient for avoids the wasting of resources.

Another advantage of the present invention is to provide a negative pressure type coating machine, wherein, in an embodiment of the present invention, the negative pressure type coating machine can widen the spraying angle to a certain extent, so as to perform high quality spraying on various surfaces such as wall, ceiling or bottom plate, without worrying about the influence of intermittent spraying on the spraying quality.

Another advantage of the present invention is to provide a negative pressure type sprayer, wherein, in an embodiment of the present invention, the negative pressure type sprayer can be followed without using a straw to suck out the feed liquid in the liquid storage bag sufficiently, which helps to simplify the structure and reduce the cost.

Another advantage of the present invention is to provide a negative pressure type spraying machine, wherein, in an embodiment of the present invention, the negative pressure type spraying machine can be followed without using a straw the feed liquid is sucked out sufficiently in the liquid storage bag, and then the drip is not generated when the liquid feeding coating is added to pollute the working environment.

Another advantage of the present invention is to provide a negative pressure sprayer, wherein, in an embodiment of the present invention, the negative pressure sprayer can assist the liquid supply by utilizing the dead weight of the liquid, so that the plunger pump only needs a small suction force to complete the suction, which helps to reduce the power consumption.

Another advantage of the present invention is to provide a negative pressure type coating machine, wherein, in an embodiment of the present invention, the negative pressure type coating machine need not to utilize the liquid storage bag to support the machine body or balance the center of gravity, helps to stand stably through the handle under the condition of having or not having the liquid storage bag.

Another advantage of the present invention is to provide a negative pressure applicator, wherein, in order to achieve the above advantages, the present invention does not require complex structures or designs. Therefore, the present invention successfully and effectively provides a solution that does not only provide a simple negative pressure applicator, but also increases the utility and reliability of the negative pressure applicator.

In order to realize above-mentioned at least one advantage or other advantages and purposes, the utility model provides a negative pressure type flush coater for spout coating liquid, wherein negative pressure type flush coater includes:

a body;

a plunger pump, wherein the plunger pump is disposed at the body, and the plunger pump has a negative pressure operating state and a positive pressure operating state;

a power supply device, wherein the power supply device is disposed on the machine body, and the power supply device is electrically connected with the plunger pump and used for supplying power to the plunger pump so as to enable the plunger pump to be switched between the negative pressure working state and the positive pressure working state in a reciprocating manner; and

the liquid storage bag comprises a soft bag body used for containing the liquid material and a liquid supply interface arranged on the soft bag body, the liquid supply interface of the liquid storage bag is suitable for being communicated with a liquid inlet of the plunger pump, when the plunger pump is in the negative pressure working state, negative pressure is formed in the plunger pump and used for sucking the liquid material from the liquid storage bag through the negative pressure, so that the soft bag body of the liquid storage bag is shrunken due to the fact that the liquid material is sucked out through the negative pressure, and when the plunger pump is in the positive pressure working state, positive pressure is formed in the plunger pump and used for pressurizing the liquid material sucked out through the negative pressure, and the pressurized liquid material flows out of a liquid outlet of the plunger pump.

According to an embodiment of the present application, the soft bag body of the liquid storage bag is made of a flexible material.

According to an embodiment of the present application, the soft bag body of the liquid storage bag is formed by heat-sealing two plastic films.

According to an embodiment of the application, the reservoir bag is detachably mounted to the machine body, and the liquid supply interface of the reservoir bag is directly communicated with the liquid inlet of the plunger pump.

According to an embodiment of the application, the liquid storage bag further comprises a bag opening and a bag cover which are arranged on the soft bag body, wherein the bag cover is detachably sealed on the bag opening.

According to an embodiment of the application, the liquid storage bag further comprises a locking piece arranged on the soft bag body, and the machine body comprises a matching piece matched with the locking piece, wherein the locking piece of the liquid storage bag is locked on the matching piece of the machine body.

According to an embodiment of the application, the reservoir bag is located above the plunger pump.

According to an embodiment of the application, the confession liquid interface of stock solution bag is located the lower part of the soft bag body, and the inlet of plunger pump is located plunger pump's pump body upper portion.

According to an embodiment of the application, negative pressure formula flush coater, further include the transfer line, wherein the one end of transfer line communicate in the stock solution bag supply liquid interface, and the other end of transfer line communicate in the inlet of plunger pump.

According to an embodiment of the application, the body comprises a housing, a handle extending downwards from the housing, and a switch assembly arranged on the handle, wherein the plunger pump is arranged in the housing, and the reservoir is mounted on the housing, wherein the power supply device is arranged on the handle, and the switch assembly is controllably connected to the plunger pump for manually controlling the opening and closing of the plunger pump.

According to an embodiment of the present application, the body further includes a pressure relief assembly for relieving pressure of the plunger pump.

According to an embodiment of this application, the pressure release subassembly including set up in the relief valve of the pressure release mouth of plunger pump with be used for the intercommunication the backward flow interface of stock solution bag with the pressure release passageway of the pressure release mouth of plunger pump, wherein the pressure release subassembly the relief valve is used for opening or the shutoff the plunger pump the pressure release mouth.

According to an embodiment of the present application, the pressure relief assembly further comprises a relief valve trigger for controlling opening and closing of the relief valve, wherein the relief valve trigger is movably disposed in the housing and is actuated to move to a first position, a second position, and a third position, wherein when the relief valve trigger is moved to the first position, the relief valve trigger controls the relief valve to block the pressure relief opening of the plunger pump; when the relief valve trigger is moved to the second position, the relief valve trigger controls the relief valve to open the relief port of the plunger pump; when the relief valve trigger is moved to the third position, the relief valve trigger activates the switch assembly to start the plunger pump while controlling the relief valve to open the relief opening of the plunger pump.

According to an embodiment of the application, the plunger pump comprises a motor electrically connectable to the power supply, a pump body arranged in the body, a plunger rod movably arranged in the pump body, and a transmission mechanism drivingly connected to the motor and the plunger rod.

According to an embodiment of the application, negative pressure formula flush coater, further include nozzle assembly, wherein nozzle assembly set up correspondingly in the plunger pump the liquid outlet for will follow the plunger pump this feed liquid that the liquid outlet flows out disperses into vaporific.

According to an embodiment of the application, the negative pressure type spray painting machine further comprises an illuminating device, wherein the illuminating device is arranged on the machine body and used for emitting illuminating light to illuminate the spraying area.

According to an embodiment of the application, the negative pressure sprayer further comprises an energy storage assembly, wherein the energy storage assembly is correspondingly arranged at the liquid outlet of the plunger pump, and the energy storage assembly has an energy storage state and an energy release state, wherein when the plunger pump is in the positive pressure working state, the energy storage assembly is in the energy storage state, so that one part of the feed liquid flowing out of the liquid outlet of the plunger pump is accumulated in the energy storage assembly, and the other part of the feed liquid is sprayed out; when the plunger pump is in the negative pressure working state, the energy storage assembly is in the energy release state, so that the feed liquid accumulated in the energy storage assembly is released to be sprayed out.

According to an embodiment of the application, the energy storage assembly is a polyurethane tube or an expansion tube.

According to the utility model discloses an on the other hand, the utility model discloses still provide the airless liquid supply method for negative pressure formula flush coater, including the step:

when the plunger pump of the negative pressure type spraying machine is in a negative pressure working state, sucking out the feed liquid from the soft bag body of the liquid storage bag of the negative pressure type spraying machine to the pump body of the plunger pump in a negative pressure manner; and

and under the action of external atmospheric pressure, the soft bag body is squeezed to be shriveled along with the negative pressure suction of the feed liquid, so that the air pressure inside and outside the liquid storage bag is kept balanced.

According to the utility model discloses an on the other hand, the utility model discloses negative pressure formula spraying method is still provided, including the step:

starting a plunger pump of the negative pressure type spraying machine to enable the plunger pump to be switched between a negative pressure working state and a positive pressure working state in a reciprocating mode;

when the plunger pump is in the negative pressure working state, the feed liquid is sucked out from the soft bag body of the liquid storage bag of the negative pressure type spraying machine to the pump body of the plunger pump in a negative pressure manner, so that the soft bag body is shrunken along with the suction of the feed liquid in the negative pressure manner; and

when the plunger pump is in the positive pressure working state, the feed liquid sucked out by the negative pressure is pressurized to be sprayed out from the liquid outlet of the plunger pump.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.

Drawings

Fig. 1 is a schematic front view of a negative pressure applicator according to an embodiment of the present invention.

Fig. 2 shows an exploded view of the negative pressure applicator according to the above-described embodiment of the present invention.

Fig. 3 is a schematic bottom view of the liquid storage bag of the negative pressure type spraying machine according to the above embodiment of the present invention.

Fig. 4 shows a schematic partial cross-sectional view of the reservoir bag according to the above embodiment of the present invention.

Fig. 5 and 6 show schematic state diagrams of the negative pressure type coating machine according to the above embodiment of the present invention.

Fig. 7 shows a schematic diagram of the piston pump in the negative pressure type sprayer according to the above embodiment of the present invention in a negative pressure working state.

Fig. 8 is a schematic diagram illustrating the piston pump in the negative pressure type sprayer according to the above embodiment of the present invention in a positive pressure working state.

Fig. 9 is a schematic diagram illustrating a state of the pressure relief assembly in the negative pressure type sprayer according to the above embodiment of the present invention.

Fig. 10 shows a first example of an energy storage assembly in the negative pressure sprayer according to the above-described embodiment of the present invention.

Fig. 11 shows a second example of an energy storage assembly in the negative pressure applicator according to the above-described embodiment of the present invention.

Fig. 12 shows a variant of the negative-pressure applicator according to the above-described embodiment of the invention.

Fig. 13 is a schematic flow chart of an airless liquid supply method for a negative pressure sprayer according to an embodiment of the present invention.

Fig. 14 is a schematic flow chart of a negative pressure spraying method according to an embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

In the present application, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element or a plurality of elements may be included in one embodiment or a plurality of elements may be included in another embodiment. The terms "a" and "an" and "the" and similar referents are to be construed to mean that the elements are limited to only one element or group, unless otherwise indicated in the disclosure.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Summary of the application

As described in the background art, in the prior art, compressed air spraying is generally used to replace the conventional roll coating and brush coating processes for spraying liquid paint or emulsion paint, but in this way, due to impurities such as water and oil contained in the compressed air, spots or bubbles appear on the sprayed surface, resulting in poor spraying quality and low spraying efficiency. At present, high-pressure airless spraying machines appear in the market, and generally a booster pump is adopted to pressurize the coating, and then the coating is sprayed out through a very thin spray hole on the spraying machine to form fan-shaped fog. Although the airless sprayer solves the problems of the airless sprayer, the air pressure in the storage bottle is reduced along with the use of the feed liquid, so that the feed liquid is difficult to be sucked into the pump. In addition, in order to make the feed liquid be easily sucked into the pump, a balance hole has to be arranged on the storage bottle, so that the feed liquid in the storage bottle is sucked out, and simultaneously, the external air enters the storage bottle to balance the air pressure inside and outside the bottle, namely, the existing spraying machine adopts ventilation feeding, but the air is easily mixed when the feed liquid is sucked out, and particularly when the feed liquid in the storage bottle is less or the spraying angle is too large, the spraying is discontinuous, and the spraying quality is seriously influenced. Therefore, in order to solve the technical problem, the application provides a negative pressure type spraying machine, which can realize airless liquid supply to avoid air mixing in the liquid when the liquid is sucked out by negative pressure, and is beneficial to improving the spraying quality and improving the spraying efficiency.

Specifically, the technical idea of the application is to break through the tradition of feeding and spraying by using a hard material storage bottle, and creatively think that the liquid storage bag is utilized to realize airless liquid supply, that is, the liquid storage bag in the continuous spraying machine of the application is shriveled along with the suction of the material liquid in the bag due to the soft bag body of the liquid storage bag, so that the external air can not enter the bag or can not enter the bag in the whole liquid supply process, the phenomenon that the material liquid is mixed with the air when being sucked by the negative pressure is thoroughly avoided, the intermittent spraying is prevented, the spraying quality is improved, and the spraying efficiency is improved.

Based on this, the present application provides a negative pressure type coating machine, is suitable for spouting coating liquid, includes: a body; a plunger pump, wherein the plunger pump is disposed at the body, and the plunger pump has a negative pressure state and a positive pressure state; a power supply device, wherein the power supply device is disposed on the body, and the power supply device is used for supplying electric energy to the plunger pump, so that the plunger pump works to switch between the negative pressure state and the positive pressure state in a reciprocating manner; and the liquid storage bag comprises a soft bag body used for containing the liquid material and a liquid supply interface arranged on the soft bag body, the liquid supply interface of the liquid storage bag is suitable for being communicated with a liquid inlet of the plunger pump, when the plunger pump is in the negative pressure state, the plunger pump is used for sucking the liquid material out of the liquid storage bag under the negative pressure so that the soft bag body of the liquid storage bag is shrunken due to the liquid material sucked out under the negative pressure, and when the plunger pump is in the positive pressure state, the plunger pump is used for pressurizing the liquid material sucked out under the negative pressure so that the pressurized liquid material is sprayed out through a liquid outlet of the plunger pump.

Illustrative embodiments

Referring to fig. 1 to 11 of the drawings of the present disclosure, an embodiment of the present invention provides a negative pressure type coating machine 1 suitable for spraying coating liquid, wherein the negative pressure type coating machine 1 may include a machine body 10, a plunger pump 20, a power supply device 30, and a liquid storage bag 40. The plunger pump 20 is disposed in the body 10, and the plunger pump 20 has a negative pressure operation state 2001 and a positive pressure operation state 2002. The power supply device 30 is disposed on the machine body 10, and the power supply device 30 is electrically connected to the plunger pump 20, and is configured to supply power to the plunger pump 20 to reciprocally switch the plunger pump 20 between the negative pressure operating state 2001 and the positive pressure operating state 2002. The liquid storage bag 40 comprises a soft bag body 41 for containing the liquid material and a liquid supply interface 42 arranged on the soft bag body 41, and the liquid supply interface 42 of the liquid storage bag 40 is suitable for being communicated with the liquid inlet 201 of the plunger pump 20. Thus, when the plunger pump 20 is in the negative pressure operation state 2001, a negative pressure is formed in the plunger pump 20, so that the liquid is sucked from the liquid storage bag 40 by the negative pressure, and the flexible bag body 41 of the liquid storage bag 40 is deflated by the suction of the liquid by the negative pressure; when the plunger pump 20 is in the positive pressure state, a positive pressure is formed in the plunger pump 20 to pressurize the liquid sucked out by the negative pressure, so that the pressurized liquid flows out through the liquid outlet 202 of the plunger pump 20.

It should be noted that, as shown in fig. 3 to 6, the flexible bag body 41 of the liquid storage bag 40 may be made of a flexible material, so as to ensure that the liquid stored in the liquid storage bag 40 is sucked out by the negative pressure of the plunger pump 20, and the flexible bag body 41 of the liquid storage bag 40 is deformed flexibly by the external atmospheric pressure. Thus, the outside air does not need to enter the liquid storage bag 40, the liquid storage bag 40 can keep the air pressure inside and outside the bag balanced, the plunger pump 20 cannot be obstructed from sucking the liquid material out of the liquid storage bag 40 under negative pressure, the air can be thoroughly prevented from being mixed into the liquid material sucked out under negative pressure, and intermittent spraying is prevented.

In addition, since the sprayed material liquid usually has strong viscosity, a large amount of material liquid is usually adhered to the inner wall of the existing material storage bottle and cannot be sucked out for utilization, which causes great waste and is difficult to clean. And this application in the negative pressure formula flush coater 1 the feed liquid also can adhere to on the inner wall of liquid storage bag 40, nevertheless along with bag feed liquid by the suction of negative pressure, outside atmospheric pressure is used in the outer wall of liquid storage bag 40 is in order to extrude the flexible bag body 41 becomes flat, like this the feed liquid that adheres on the inner wall of liquid storage bag 40 can by the flexible bag body 41 extrudees in order to face supply liquid interface 42 gathering, the make full use of feed liquid of being convenient for avoids causing the waste.

Specifically, according to the above-mentioned embodiment of the present application, as shown in fig. 3 and 4, the soft bag body 41 of the liquid storage bag 40 can be, but is not limited to, formed by heat sealing two plastic films, and the manufacturing process is simple and the manufacturing cost is low. Thus, when the liquid storage bag 40 is not filled with liquid, the soft bag body 41 of the liquid storage bag 40 is sheet-shaped and is convenient to carry; however, when the liquid is filled, the soft bag body 41 of the liquid storage bag 40 is expanded to store more liquid; further, in the process of sucking the liquid under negative pressure, the soft bag body 41 of the liquid storage bag 40 is deflated, so that the air pressure inside and outside the bag is kept balanced while no air enters, until the liquid is completely sucked out and becomes a sheet. It is understood that the flexible material for making the soft bag 41 can be, but is not limited to, made of polymer material such as resin or fiber, composite material, or other material capable of being made into a film, and will not be described in detail herein.

More specifically, as shown in fig. 5 and 6, the liquid storage bag 40 is disposed on the machine body 10, and the liquid supply interface 42 of the liquid storage bag 40 directly communicates with the liquid inlet 201 of the plunger pump 20, so as to supply airless liquid to the plunger pump 20 through the liquid storage bag 40.

In an example of the present application, as shown in fig. 2, the liquid storage bag 40 is detachably mounted on the machine body 10, and the liquid supply port 42 of the liquid storage bag 40 is detachably connected to the liquid supply port 201 of the plunger pump 20, so as to disassemble and assemble the liquid storage bag 40, which facilitates replacing the liquid storage bag 40 storing different liquid according to requirements, and is convenient for expanding application scenarios of the negative pressure type spraying machine 1, such as spraying water-proof or paint and the like.

Preferably, as shown in fig. 4, the liquid storage bag 40 further includes a bag opening 43 and a bag cover 44 disposed on the soft bag body 41, wherein the bag cover 44 is adapted to be detachably sealed to the bag opening 43, so that the soft bag body 41 is filled with new liquid through the bag opening 43 without detaching the liquid storage bag 40, thereby facilitating the reuse of the liquid storage bag 40 and saving resources. Of course, in other examples of the present application, even though the liquid storage bag 40 and the machine body 10 are not detachable, different liquid materials can be replaced through the bag opening 43, so that the negative pressure type spraying machine 1 can adapt to different application scenarios. It is understood that the cover 44 may be, but is not limited to, screw-coupled to the mouth 43 of the reservoir bag 40.

More preferably, as shown in fig. 2 and 3, the liquid storage bag 40 further includes a latch 45 disposed on the soft bag 41, and the machine body 10 includes a mating member 11 matching with the latch 45, wherein the latch 45 of the liquid storage bag 40 is latched to the mating member 11 of the machine body 10 to detachably mount the liquid storage bag 40 on the machine body 10.

Most preferably, the liquid storage bag 40 is suitable for being located above the plunger pump 20, so that the liquid in the liquid storage bag 40 can flow to the plunger pump 20 under the action of the self weight, which is helpful for assisting the plunger pump 20 to suck the liquid from the liquid storage bag 40 by negative pressure, thereby reducing the negative pressure suction resistance of the liquid and improving the liquid supply efficiency. It is understood that in other examples of the present application, the reservoir bag 40 may be located at a side of the plunger pump 20, or even below the plunger pump 20, and the negative pressure suction of the plunger pump 20 can be achieved without using a suction tube inserted into the reservoir bag 40.

Illustratively, as shown in fig. 4 and 5, the liquid supply interface 42 of the liquid storage bag 40 is located at the lower part of the soft bag 41, and the liquid inlet 201 of the plunger pump 20 is located at the upper part of the pump body of the plunger pump 20, so that when the liquid supply interface 42 of the liquid storage bag 40 is communicated with the liquid inlet 201 of the plunger pump 20, the liquid storage bag 40 is located above the plunger pump 20, so as to facilitate the negative pressure liquid suction of the plunger pump 20 by the self weight of the liquid.

In addition, the locking member 45 of the reservoir 40 may include a rear fastening member 451 and a front locking member 452 disposed on the soft bag 41, and the rear fastening member 451 of the reservoir 40 is adapted to be locked to the mating member 11 at the rear portion of the machine body 10, and the front locking member 452 of the reservoir 40 is adapted to be locked to the mating member 11 at the front portion of the machine body 10, so as to stably mount the reservoir 40 to the machine body 10. It is understood that the application is front-to-back defined by the spraying direction of negative pressure applicator 1, i.e. negative pressure applicator 1 sprays from back to front, i.e. liquid outlet 202 of plunger pump 20 faces forward.

It is noted that the reservoir of the prior art airless sprayer is typically disposed below the plunger pump and cooperates with the handle to support the entire body so that the prior art airless sprayer can stand. However, the existing airless sprayer cannot stand after the storage bottle is detached, so that the existing airless sprayer can only be laid when the storage bottle is replaced or new feed liquid is supplemented into the storage bottle, the nozzle of the existing airless sprayer is easily polluted, and the subsequent spraying quality is seriously influenced. And the application the stock solution bag 40 is installed in the top of organism 10 for the focus of organism 10 is in the dismouting the stock solution bag 40 front and back can not appear big skew, consequently negative pressure formula flush coater 1 is in the dismouting the stock solution bag 40 front and back homoenergetic can rely on the handle of organism 10 realizes standing steadily, avoids negative pressure formula flush coater 1's nozzle contact ground and is polluted.

Illustratively, as shown in fig. 5 and 6, the machine body 10 of the negative pressure sprayer 1 may include a housing 12 provided with the fitting 11, a handle 13 extending downward from the housing 12, and a switch assembly 14 provided on the handle 13, wherein the plunger pump 20 is disposed in the housing 12, and the reservoir bag 40 is mounted on the housing 12, wherein the power supply device 30 is disposed on the handle 13, and the switch assembly 14 is controllably connected to the plunger pump 20 for manually controlling the on/off of the plunger pump 20. This allows the user to manually activate the switch assembly 14 while holding the handle 13 to control the operation of the plunger pump 20, facilitating one-handed use of the negative pressure applicator 1 by the user. For example, the negative pressure type coating machine 1 is pistol-shaped as a whole to be implemented as a spray gun for facilitating a single-handed coating operation by a user.

Specifically, the switch assembly 14 of the machine body 10 includes a main switch 141 disposed in an electric circuit between the plunger pump 20 and the power supply device 30, and a switch trigger 142 movably disposed on the handle 13, wherein the switch trigger 142 is triggered to trigger the main switch 141 to open and close, so that the electric circuit between the plunger pump 20 and the power supply device 30 is closed or opened, and the plunger pump 20 starts or stops working.

More specifically, the power supply 30 may include, but is not limited to, a battery pack 31 mounted to the handle 13, wherein the battery pack 31 is electrically connectable with the plunger pump 20 to provide power to the plunger pump 20 through the battery pack 31. Of course, in other examples of the present application, the power supply device 30 may be implemented as a power plug or a power jack for being electrically connectable with an external power source, so as to communicate the external power source and the plunger pump 20 through the power supply device 30, and also to be able to supply the plunger pump 20 with electric energy.

Preferably, as shown in fig. 2 and 5, the battery pack 31 of the power supply device 30 is detachably mounted to the handle 13, so that the battery pack 13 can be electrically connected to the plunger pump 20 when the battery pack 31 is mounted to the handle 13, and so that the battery pack 31 can be charged or replaced with a new battery pack when the battery pack 31 is detached from the handle 13.

According to the above-mentioned embodiment of the present application, as shown in fig. 5 to 8, the plunger pump 20 may include a motor 21 electrically connected to the power supply device 30, a pump body 22 disposed in the machine body 10, a plunger rod 23 movably disposed in the pump body 22, and a transmission mechanism 24 drivingly connecting the motor 21 and the plunger rod 23. Thus, when the power supply device 30 supplies power to the motor 21, the motor 21 operates to drive the plunger rod 23 to reciprocate in the pump body 22 through the transmission mechanism 24, wherein when the plunger rod 23 is driven to move backwards, the plunger pump 20 is in the negative pressure operating state 2001, so that negative pressure is formed in the pump body 22 to suck out the feed liquid from the liquid storage bag 40 through the liquid inlet 201; and when the plunger rod 23 is driven to move forward, the plunger pump 20 is in the positive pressure operating state 2002, so that positive pressure is formed in the pump body 22 to pressurize the feed liquid in the pump body 22, and the pressurized feed liquid can be ejected from the liquid outlet 202.

Illustratively, the transmission mechanism 24 of the plunger pump 20 may include, but is not limited to, a transmission gear, wherein the transmission gear is engaged with an output gear of the motor 21, and the conventional gear is connected with the plunger rod 23, so that when the motor 21 is operated, the transmission gear is driven to reciprocate the plunger rod 23 in the pump body 22.

In addition, as shown in fig. 7 and 8, the plunger pump 20 may further include an inlet valve assembly 25 disposed at the inlet 201 and an outlet valve assembly 26 disposed at the outlet 202, wherein when the plunger pump 20 is in the negative pressure operating state 2001, the outlet valve assembly 26 is configured to close the outlet 202 to form a negative pressure environment in the pump body 22 of the plunger pump 20, and the inlet valve assembly 25 is configured to open the inlet 201 to open the flow passage between the reservoir bag 40 and the plunger pump 20, so that the liquid in the reservoir bag 40 is sucked out by the negative pressure of the plunger pump 20 to flow from the inlet 201 into the pump body 22; when the plunger pump 20 is in the positive pressure operating state 2002, the liquid inlet valve assembly 25 is configured to close the liquid inlet 201 to form a positive pressure environment in the pump body 22 of the plunger pump 20, so that the liquid material sucked out by the negative pressure is pressurized in the pump body 22, and the liquid outlet valve assembly 26 is configured to open the liquid outlet 202, so that the pressurized liquid material is ejected from the liquid outlet 202 for spraying operation.

It is understood that both the inlet valve assembly 25 and the outlet valve assembly 26 of the plunger pump 20 may include, but are not limited to, one-way valves comprising valve balls and springs, wherein the inlet valve assembly 25 allows feed liquid to flow from the outside of the pump into the pump, but prevents feed liquid from flowing from the inside of the pump out of the pump; the outlet valve assembly 26 allows feed liquid to flow from the pump to the outside of the pump, but prevents feed liquid from flowing from the outside of the pump to the inside of the pump.

According to the above-mentioned embodiment of the present application, as shown in fig. 2 and fig. 5, negative pressure sprayer 1 may further include nozzle assembly 50, wherein nozzle assembly 50 is correspondingly disposed on liquid outlet 202 of plunger pump 20, and is configured to disperse the liquid flowing out from liquid outlet 202 of plunger pump 20 into a mist shape, so as to uniformly spray. It is understood that the nozzle assembly 50 may be detachably mounted to the housing 12 of the machine body 10, or the nozzle assembly 50 may also be integrally formed on the housing 12 of the machine body 10, as long as it can correspond to the liquid outlet 202 of the plunger pump 20, and details thereof are not repeated herein.

Specifically, the nozzle assembly 50 may include a nozzle head 51 and a nozzle valve 52, wherein the nozzle valve 52 is correspondingly mounted to the pump body 22 of the plunger pump 20 to correspond to the liquid outlet 202 of the plunger pump 20, and the nozzle head 51 is detachably mounted to the nozzle valve 52 to open or close a spray passage of the nozzle head 51 through the nozzle valve 52. It is understood that the nozzle assembly 50 may be, but is not limited to being, implemented as a high pressure atomizing nozzle.

According to the above embodiment of the present application, as shown in fig. 2 and 5, the machine body 10 of the negative pressure sprayer 1 may further include a pressure relief assembly 15, where the pressure relief assembly 15 is used for relieving pressure of the plunger pump 20, so as to prevent the plunger pump 20 from maintaining high pressure when not operating, and to help prolong the service life of the plunger pump 20.

Specifically, the pressure relief assembly 15 includes a pressure relief valve 151 disposed at a pressure relief opening 203 of the plunger pump 20, and is used for opening or closing off the pressure relief opening 203 of the plunger pump 20, wherein when the pressure relief valve 151 is controlled to close off the pressure relief opening 203 of the plunger pump 20, the negative pressure type sprayer 1 can normally perform a spraying operation; when the pressure relief valve 151 is controlled to open the pressure relief opening 203 of the plunger pump 20, the plunger pump 20 is relieved of pressure through the pressure relief opening 203, and although the negative pressure type sprayer 1 cannot perform normal spraying operation, the high pressure in the plunger pump 20 can be relieved for subsequent maintenance or repair of the plunger pump 20. In particular, when the relief valve 151 is controlled to open the relief opening 203 of the plunger pump 20, even if the plunger pump 20 is still operating, the pressurized feed liquid does not flow out from the liquid outlet 202 of the plunger pump 20, but flows out from the relief opening 203 of the plunger pump 20, and a normal spraying operation cannot be performed, but a cleaning operation is possible.

More specifically, the pressure relief assembly 15 includes a pressure relief channel 152, wherein the pressure relief channel 152 is communicated with the pressure relief opening 203 of the plunger pump 20 and the backflow port 46 of the liquid storage bag 40, so that after the pressure relief opening 203 of the plunger pump 20 is opened, the liquid material in the plunger pump 20 can flow back to the liquid storage bag 40 through the pressure relief channel 152, thereby avoiding wasting the liquid material.

Preferably, the pressure relief channel 152 extends from the pressure relief port 203 of the plunger pump 20 to the liquid inlet valve assembly 25 of the plunger pump 20, and the return port 46 of the reservoir bag 40 is adjacent to the liquid supply port 42 of the reservoir bag 40, so that when the reservoir bag 40 is mounted in the machine body 10, the liquid supply port 42 and the return port 46 of the reservoir bag 40 are correspondingly connected to the pressure relief channel 152 of the liquid inlet valve assembly 25 and the pressure relief assembly 15 of the plunger pump 20, respectively, so that the liquid supply port 42 and the return port 46 of the reservoir bag 40 are correspondingly communicated with the liquid inlet 201 and the pressure relief port 203 of the plunger pump 20, respectively.

Illustratively, as shown in fig. 5 and 9, the pressure relief assembly 15 may further include a pressure relief valve trigger 153 for controlling opening and closing of the pressure relief valve 151, wherein the pressure relief valve trigger 153 is movably disposed on the housing 12, and the pressure relief valve trigger 153 can be driven to move to a first position 1501 (e.g., position P) and a second position 1502 (e.g., position X), wherein when the pressure relief valve trigger 153 is moved to the first position 1501, the pressure relief valve trigger 153 controls the pressure relief valve 151 to block the pressure relief opening 203 of the plunger pump 20, so that the negative pressure sprayer 1 can spray normally; when the pressure relief valve trigger 153 is moved to the second position 1502, the pressure relief valve trigger 153 controls the pressure relief valve 151 to open the pressure relief port 203 of the plunger pump 20, so that the plunger pump 20 of the negative pressure sprayer 1 can be depressurized.

Preferably, as shown in fig. 9, the pressure relief valve trigger 153 can be further driven to move to a third position 1503 (e.g., position Q) to activate the switch trigger 142 of the switch assembly 14 while controlling the pressure relief valve 151 to open the pressure relief opening 203 of the plunger pump 20, so that the main switch 141 is closed to start the plunger pump 20, thereby realizing the automatic cleaning process of the negative pressure sprayer 1.

More preferably, the pressure relief valve trigger 153 is pivotally connected to the housing 12 at a position adjacent to the switch assembly 14, wherein when the pressure relief valve trigger 153 is rotated to the third position 1503, the pressure relief valve trigger 153 directly actuates the switch trigger 142 to turn on the plunger pump 20. Thus, when the relief valve trigger 153 is in the third position 1503, the relief valve 151 is controlled to open the relief port 203 of the plunger pump 20, and the main switch 141 is triggered to turn on the plunger pump 20 to perform a cleaning process, instead of requiring a continuous hand press on the valve trigger during the cleaning process as in the prior art spray gun.

It should be noted that, limited by the operation principle of the plunger pump 20, when the plunger pump 20 is in the positive pressure operation state 2002, the plunger pump 20 will pressurize the feed liquid to make the pressurized feed liquid eject from the liquid outlet 202; when the plunger pump 20 is in the negative pressure working state 2001, the liquid inlet 201 of the plunger pump 20 is opened to perform negative pressure liquid suction, but the liquid outlet 202 of the plunger pump 20 is blocked and does not discharge liquid continuously, that is, no liquid is sprayed out when the plunger pump 20 is in the negative pressure working state, so that the negative pressure type spraying machine 1 performs intermittent spraying. In order to solve the problem, the existing spraying machine usually adopts a multi-cylinder plunger pump, so that the pressurizing processes in different cylinders of the plunger pump are staggered to spray in a time-sharing manner, but the scheme not only needs a more complex structure and increases the manufacturing cost, but also needs to separate the pressurizing processes of different cylinders in order to avoid the mutual interference of different cylinders of the plunger pump, only can shorten the discontinuous time of spraying, and cannot really realize continuous spraying.

Therefore, as shown in fig. 5, 10 and 11, in order to achieve truly continuous spraying, the negative pressure sprayer 1 of the present application may further include an energy storage assembly 60, wherein the energy storage assembly 60 is correspondingly disposed between the liquid outlet 202 of the plunger pump 20 and the nozzle assembly 50, and the energy storage assembly 60 has an energy storage state 602 and an energy release state 601, wherein when the plunger pump 20 is in the positive pressure operating state 2002 to pressurize the feed liquid and flow out from the liquid outlet 202, the energy storage assembly 60 will be in the energy storage state 602, so that a part of the pressurized feed liquid is accumulated in the energy storage assembly 60, and another part of the pressurized feed liquid will be ejected from the nozzle assembly 50; when the plunger pump 20 is in the negative pressure operating state 2001, the energy storage assembly 60 is in the energy release state 601, so that the accumulated material liquid is released to be ejected from the nozzle assembly 50.

In other words, when the plunger pump 20 is in the positive pressure operating state, the energy storage assembly 60 accumulates a part of the feed liquid, and the rest of the feed liquid is ejected to perform the spraying operation; when the plunger pump 20 is in the negative pressure operating state 2001, the energy storage assembly 60 can release the accumulated liquid, so that the accumulated liquid can be discharged to perform the spraying operation, and thus, the liquid can be discharged regardless of whether the plunger pump 20 is in the positive pressure operating state 2002 or the negative pressure operating state 2001, thereby achieving the effect of continuous spraying.

Specifically, as shown in fig. 10 and 11, the energy storage assembly 60 may have an energy storage cavity 600 with a variable volume, and the energy storage cavity 600 is communicated with the liquid outlet 202 of the plunger pump 20 and the nozzle assembly 50, wherein when the energy storage assembly 60 is in the energy storage state 602, the volume of the energy storage cavity 600 is increased from small to large to accumulate the pressurized liquid, i.e., accumulate pressure potential energy; when the energy storage assembly 60 is in the energy release state 601, the volume of the energy storage cavity 600 is reduced from large to small to release the accumulated material liquid, i.e., release the pressure potential energy.

It should be noted that, since the volume of the energy storage cavity 600 of the energy storage assembly 60 changes under the action of the feed liquid, the energy storage assembly 60 can balance the pressure of the feed liquid besides accumulating and releasing the feed liquid in a staggered manner, so that the ejection speed of the feed liquid is kept consistent. In other words, when the plunger pump 20 is in the positive pressure operating state 2002, after the pressurized feed liquid flows into the energy storage cavity 600 of the energy storage assembly 60, the volume of the energy storage cavity 600 becomes large to play a role of buffering, so that the ejection speed of the feed liquid does not become large suddenly; when the plunger pump 20 is in the negative pressure operating state 2001, the volume of the energy storage chamber 600 is reduced to release the feed liquid, so that the ejection speed of the feed liquid is not suddenly reduced, which is helpful for realizing continuous and uniform spraying.

More specifically, the energy storage assembly 60 may include a hollow elastic tube 61, wherein one end of the hollow elastic tube 61 is connected to the liquid outlet valve assembly 25 of the plunger pump 20, and the other end of the hollow elastic tube 61 is connected to the nozzle valve 52 of the nozzle assembly 50, so as to form the energy storage chamber 600 with a variable volume between the plunger pump 20 and the nozzle assembly 50 through the hollow elastic tube 61. Thus, when the plunger pump 20 is in the positive pressure operating state 2002, the pressurized feed liquid flowing out from the liquid outlet 202 of the plunger pump 20 will first enter the hollow elastic tube 61, at this time, the tube wall of the hollow elastic tube 61 is elastically deformed under the pressure of the feed liquid to enlarge the volume of the energy storage cavity 600, so that a part of the feed liquid flowing out from the liquid outlet 202 is accumulated in the energy storage cavity 600, and another part of the feed liquid is ejected through the nozzle assembly 50; when the plunger pump 20 is in the negative pressure operating state 2001, the wall of the hollow elastic tube 61 is restored under the action of its own elastic force to reduce the volume of the energy storage chamber 600, so that the material liquid accumulated in the energy storage chamber 600 is released to be ejected from the nozzle assembly 50, thereby realizing continuous spraying of the material liquid.

Exemplarily, as shown in fig. 10, in the first example of the present application, the hollow elastic tube 61 is implemented as a polyurethane tube 611, wherein when the plunger pump 20 is in the positive pressure operating state 2002, the tube wall of the polyurethane tube 610 is pressed by the feed liquid to be thinned, so that the volume of the energy storage chamber 600 becomes larger to accumulate the feed liquid, that is, the energy storage assembly 60 is in the energy storage state; and when the plunger pump 20 is in the negative pressure working state 2001, the wall of the polyurethane tube 610 becomes thick to restore to the original shape, so that the volume of the energy storage cavity 600 becomes small to release the feed liquid, that is, the energy storage assembly 60 is in the energy release state.

As shown in fig. 11, in the second example of the present application, the hollow elastic tube 61 may also be implemented as an expansion tube 612, wherein when the plunger pump 20 is in the positive pressure operating state 2002, the expansion tube 612 is pressed by the feed liquid to expand, so that the volume of the energy storage cavity 600 is increased to accumulate the feed liquid, i.e. the energy storage assembly 60 is in the energy storage state; and when the plunger pump 20 is in the negative pressure working state 2001, the expansion tube 612 contracts to restore to the original shape, so that the volume of the energy storage cavity 600 becomes smaller to release the feed liquid, that is, the energy storage assembly 60 is in the energy release state.

It is worth mentioning that, as shown in fig. 1 and 2, according to the above-mentioned embodiment of the present application, the negative pressure type sprayer 1 may further include an illuminating device 70, wherein the illuminating device 70 is disposed on the machine body 10 for emitting illuminating light to illuminate the spraying area, so as to facilitate a user to observe the spraying area or the spraying effect in a dim or dark environment.

Illustratively, as shown in fig. 5 and 6, the lighting device 70 may include a light source 71 and a lighting switch 72 electrically connected to the power supply device 30, wherein the light source 71 is mounted at the front end of the housing 12, and the light source 71 is configured to emit illumination light along the spraying direction, wherein the lighting switch 72 is configured to turn on or off the light source 71, so that a user controls the light on or off of the light source 71 through the lighting switch 72 as desired. It is understood that the light source 71 may be, but is not limited to being, implemented as an LED lamp bead.

It should be noted that, although the liquid storage bag 40 in the negative pressure sprayer 1 in the above-mentioned embodiment is installed in the machine body 10 to be directly communicated with the plunger pump 20, so that the negative pressure sprayer 1 has an integrated structure, in other embodiments of the present application, the liquid storage bag 40 may not be installed in the machine body 10, so that the negative pressure sprayer 1 has a split structure, and at this time, only the liquid in the liquid storage bag 40 needs to be conveyed to the liquid inlet 201 of the plunger pump 20 by a conveying device.

Illustratively, fig. 12 shows a modified embodiment of the negative pressure sprayer 1 according to the above-mentioned embodiment of the present application, wherein the negative pressure sprayer 1 further includes a liquid transport tube 80, wherein one end of the liquid transport tube 80 is communicated with the liquid supply interface 42 of the liquid storage bag 40, and the other end of the liquid transport tube 80 is communicated with the liquid inlet 201 of the plunger pump 20, so that when the plunger pump 20 is in the negative pressure working state, the liquid in the liquid storage bag 40 flows out from the liquid supply interface 42 first under the action of the pressure difference, then flows to the liquid inlet 201 of the plunger pump 20 through the liquid transport tube 80, and finally flows into the pump body 22 of the plunger pump 20 from the liquid inlet 201 of the plunger pump 20. It can be understood that, in this variant embodiment of the present application, the reservoir bag 40 does not need to be mounted to the machine body 10, which helps to greatly reduce the weight of the user and the labor load of the user.

It is worth mentioning that according to another aspect of the present application, as shown in fig. 13, an embodiment of the present application further provides an airless liquid supply method for the negative pressure sprayer 1, which may include the steps of:

s110: when the plunger pump of the negative pressure type spraying machine is in a negative pressure working state, sucking out the feed liquid from the soft bag body of the liquid storage bag of the negative pressure type spraying machine to the pump body of the plunger pump in a negative pressure manner; and

s120: and under the action of external atmospheric pressure, the soft bag body is squeezed to be shriveled along with the suction of the negative pressure of the feed liquid, so that the air pressure inside and outside the liquid storage bag is kept balanced.

It can be understood that, just because the soft bag can become flat along with the negative pressure suction of this feed liquid for the atmospheric pressure just can keep balanced when need not outside air admission inside and outside this liquid storage bag, consequently the liquid storage bag can keep airless state throughout in the soft bag, avoid being mixed into the air in the feed liquid of negative pressure suction to realize the effect that the airless supplied liquid, help improving the spraying quality of negative pressure formula flush coater.

It is worth mentioning that according to another aspect of the present application, as shown in fig. 14, an embodiment of the present application further provides a negative pressure type spraying method, which may include the steps of:

s210: starting a plunger pump of the negative pressure type spraying machine to enable the plunger pump to be switched between a negative pressure working state and a positive pressure working state in a reciprocating mode;

s220: when the plunger pump is in the negative pressure working state, the feed liquid is sucked out from the soft bag body of the liquid storage bag of the negative pressure type spraying machine to the pump body of the plunger pump in a negative pressure manner, so that the soft bag body is shrunken along with the suction of the feed liquid in the negative pressure manner; and

s230: when the plunger pump is in the positive pressure working state, the feed liquid sucked out by the negative pressure is pressurized to be sprayed out from the liquid outlet of the plunger pump.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims (18)

1. Negative pressure formula flush coater for spout coating liquid, its characterized in that, wherein negative pressure formula flush coater includes:

a body;

a plunger pump, wherein the plunger pump is disposed at the body, and the plunger pump has a negative pressure operating state and a positive pressure operating state;

a power supply device, wherein the power supply device is disposed on the machine body, and the power supply device is electrically connected with the plunger pump and used for supplying power to the plunger pump so as to enable the plunger pump to be switched between the negative pressure working state and the positive pressure working state in a reciprocating manner; and

the liquid storage bag comprises a soft bag body used for containing the liquid material and a liquid supply interface arranged on the soft bag body, the liquid supply interface of the liquid storage bag is suitable for being communicated with a liquid inlet of the plunger pump, when the plunger pump is in the negative pressure working state, negative pressure is formed in the plunger pump and used for sucking the liquid material from the liquid storage bag through the negative pressure, so that the soft bag body of the liquid storage bag is shrunken due to the fact that the liquid material is sucked out through the negative pressure, and when the plunger pump is in the positive pressure working state, positive pressure is formed in the plunger pump and used for pressurizing the liquid material sucked out through the negative pressure, and the pressurized liquid material flows out of a liquid outlet of the plunger pump.

2. The negative-pressure sprayer of claim 1, wherein the flexible bag body of the reservoir bag is made of a flexible material.

3. The negative pressure sprayer of claim 2, wherein the flexible bag body of the reservoir bag is formed by heat-sealing two plastic films.

4. The negative-pressure sprayer of claim 1, wherein the reservoir bag is detachably mounted to the body, and the liquid supply interface of the reservoir bag is in direct communication with the liquid inlet of the plunger pump.

5. The negative-pressure sprayer of claim 4, wherein the reservoir bag further comprises a bag opening and a flap disposed in the flexible bag body, wherein the flap is removably sealed to the bag opening.

6. The negative-pressure sprayer of claim 4, wherein the reservoir further comprises a latch member disposed on the bladder, and the body comprises a mating member that mates with the latch member, wherein the latch member of the reservoir is latched to the mating member of the body.

7. The negative-pressure sprayer of any one of claims 1 to 6, wherein the reservoir is located above the plunger pump.

8. The negative-pressure sprayer of claim 7, wherein the liquid supply interface of the reservoir bag is located at a lower portion of the soft bag body, and the liquid inlet of the plunger pump is located at an upper portion of a pump body of the plunger pump.

9. The negative-pressure sprayer according to any one of claims 1 to 6, further comprising a liquid conveying tube, wherein one end of the liquid conveying tube is communicated with the liquid supply port of the liquid storage bag, and the other end of the liquid conveying tube is communicated with the liquid inlet of the plunger pump.

10. The negative-pressure sprayer of any one of claims 1 to 6, wherein the housing comprises a housing, a handle extending downwardly from the housing, and a switch assembly disposed on the handle, wherein the plunger pump is disposed within the housing, and the reservoir is mounted on the housing, wherein the power supply is disposed on the handle, and the switch assembly is controllably connected to the plunger pump for manually controlling the plunger pump to open and close.

11. The negative-pressure applicator of claim 10, wherein the housing further comprises a pressure relief assembly for relieving pressure to the plunger pump.

12. The negative-pressure sprayer according to claim 11, wherein the pressure relief assembly comprises a pressure relief valve arranged at the pressure relief opening of the plunger pump and a pressure relief channel for communicating the backflow port of the reservoir bag with the pressure relief opening of the plunger pump, and the pressure relief valve of the pressure relief assembly is used for opening or blocking the pressure relief opening of the plunger pump.

13. The negative pressure sprayer of claim 12, wherein the pressure relief assembly further comprises a relief valve trigger for controlling opening and closing of the relief valve, wherein the relief valve trigger is movably disposed in the housing and is actuated to move to a first position, a second position, and a third position, wherein the relief valve trigger controls the relief valve to block the pressure relief opening of the plunger pump when the relief valve trigger is moved to the first position; when the relief valve trigger is moved to the second position, the relief valve trigger controls the relief valve to open the relief port of the plunger pump; when the relief valve trigger is moved to the third position, the relief valve trigger activates the switch assembly to start the plunger pump while controlling the relief valve to open the relief opening of the plunger pump.

14. The negative pressure sprayer of any one of claims 1 to 6, wherein the plunger pump comprises a motor electrically connectable to the power supply, a pump body disposed in the body, a plunger rod movably disposed in the pump body, and a transmission mechanism drivingly connected to the motor and the plunger rod.

15. The negative-pressure sprayer of any one of claims 1 to 6, further comprising a nozzle assembly, wherein the nozzle assembly is correspondingly disposed at the liquid outlet of the plunger pump for dispersing the liquid flowing out of the liquid outlet of the plunger pump into a mist.

16. The negative pressure sprayer of any one of claims 1 to 6, further comprising an illumination device, wherein the illumination device is disposed on the body for emitting illumination light to illuminate a spray area.

17. The negative-pressure sprayer of any one of claims 1 to 6, further comprising an energy storage assembly, wherein the energy storage assembly is correspondingly disposed at the liquid outlet of the plunger pump, and the energy storage assembly has an energy storage state and an energy release state, wherein when the plunger pump is in the positive-pressure working state, the energy storage assembly is in the energy storage state, so that a part of the feed liquid flowing out of the liquid outlet of the plunger pump is accumulated in the energy storage assembly, and another part of the feed liquid is sprayed out; when the plunger pump is in the negative pressure working state, the energy storage assembly is in the energy release state, so that the feed liquid accumulated in the energy storage assembly is released to be sprayed out.

18. The negative pressure applicator of claim 17, wherein the energy storage assembly is a polyurethane tube or an expansion tube.

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