Portable electric sprayer

Abstract

A portable electric sprayer, comprising a base (100), a liquid storage tank (200), a spray assembly (300), a pumping assembly (400), and a battery (500). The pumping assembly (400) comprises a plunger pump (410), a motor (420), a liquid inlet pipe (430), and a liquid outlet pipeline (440). A pressure controller (600) and a pressure relief branch (700) are provided on the liquid outlet pipeline (440); a preset pressure value P1 is set for the pressure controller (600); the pressure relief branch (700) comprises a pressure relief valve (710) connected to the liquid outlet pipeline (440); a pressure relief pressure value P2 is set for the pressure relief valve (710); the pressure relief pressure value P2 is greater than or equal to the preset pressure value P1; and when the pressure inside the liquid outlet pipeline (440) reaches the pressure relief pressure value P2, the pressure relief valve (710) opens to drain liquid inside the liquid outlet pipeline (440). The sprayer avoids pipe bursting of liquid outlet pipelines due to excessive pressure.

Description

A portable electric sprayer Technical Field

[0001] The present invention relates to the technical field of sprayers, in particular to a portable electric sprayer. Background Art

[0002] A sprayer, short for "atomizer," typically uses suction to turn liquids into a mist, which is then evenly sprayed onto an object. Traditional sprayers rely on manual cranking to apply pressure, creating a mist-like spray. However, this method is labor-intensive and produces poor atomization. Existing electric sprayers typically use batteries to power the pump, which also applies pressure, improving atomization efficiency while reducing user effort.

[0003] Traditional electric sprayers typically use a diaphragm pump for suction and pressurization. Due to the low suction strength of diaphragm pumps, electric sprayers are less susceptible to excessive water pressure during operation. To improve the spraying effect, some manufacturers use plunger pumps instead of diaphragm pumps. Due to the higher suction strength of plunger pumps, the sprayer's spray stroke is significantly increased, better meeting the needs of high-altitude and long-distance spraying. However, when using a plunger pump, if the spray is not discharged smoothly or the plunger pump malfunctions, the pipe body can easily burst due to excessive water pressure, requiring the sprayer to be repaired before it can be used again, which is not conducive to ensuring a good user experience.

[0004] Summary of the Invention

[0005] In order to address the shortcomings and deficiencies in the above-mentioned prior art, the present invention provides a portable electric sprayer, which is equipped with a pressure relief branch on the liquid outlet pipe, so that the liquid in the liquid outlet pipe can be discharged in time through the pressure relief branch when the pressure reaches the pressure relief pressure value P2, thereby avoiding the liquid outlet pipe from bursting due to excessive pressure, thereby ensuring the working performance of the sprayer.

[0006] In order to achieve the above technical objectives, the present invention provides a portable electric sprayer, comprising a base, a liquid storage pot for holding liquid, a spray assembly for atomizing and spraying the liquid, a pumping assembly for pumping the liquid in the liquid storage pot to the spray assembly, and a battery for powering the power supply. The pumping assembly includes a plunger pump, a motor for driving the plunger pump, an inlet pipe for connecting the liquid storage pot and the plunger pump inlet, and a liquid outlet pipeline for connecting the plunger pump outlet and the spray assembly. A pressure controller and a pressure relief branch are provided on the liquid outlet pipeline. The pressure controller is provided with a preset pressure value P1. The pressure relief branch includes a pressure relief valve connected to the liquid outlet pipeline. The pressure relief valve is provided with a pressure relief pressure value P2. The pressure relief pressure value P2 is greater than or equal to the preset pressure value P1. The pressure relief valve opens when the pressure in the liquid outlet pipeline reaches the pressure relief pressure value P2 to discharge the liquid in the liquid outlet pipeline.

[0007] Preferably, the pressure relief branch includes a reflux pipe, one end of which is connected to the pressure relief valve and the other end is connected to the liquid storage pot.

[0008] Preferably, the pressure relief valve includes a valve seat with a valve hole, a valve body with a valve cavity, a valve ball for opening and closing the valve hole, and a spring acting on the valve ball. The valve ball and the spring are arranged in the valve cavity and the spring pushes the valve ball toward the valve hole. When the valve ball opens the valve hole, the valve hole is connected to the valve cavity, and when the valve ball closes the valve hole, the valve hole is disconnected from the valve cavity. The spring is configured to be deformed by force when the valve ball leaves the valve seat to open the valve hole, and to drive the valve ball to contact the valve seat to close the valve hole when the pressure in the liquid outlet pipeline is less than the pressure relief pressure value P2.

[0009] Preferably, the pressure relief valve includes a pressure relief joint connected to the valve body, one end of the pressure relief joint is provided with a convex edge extending into the valve cavity, one end of the spring is sleeved on the outside of the convex edge and contacts the pressure relief joint, and the other end of the spring contacts the valve ball.

[0010] Preferably, the pressure relief joint and the valve body are connected together through threaded fitting.

[0011] Preferably, the liquid outlet pipeline includes a liquid outlet joint connected to the plunger pump and a hose for connecting the liquid outlet joint and the spray assembly, the pressure controller is arranged on the liquid outlet joint, the liquid outlet joint is provided with a hollow protruding column protruding outward, and the pressure relief valve is connected to the liquid outlet joint through a pressure relief pipe, one end of the pressure relief pipe is socketed with the protruding column and the other end is socketed with the valve seat.

[0012] Preferably, the valve body and the valve seat are integrally formed.

[0013] Preferably, the pressure relief branch is arranged downstream of the pressure controller.

[0014] Preferably, 0.1 MPa≤P2-P1≤1 MPa.

[0015] Preferably, the pressure controller is connected in series with the motor and has two contacts, which are in a closed state when the pressure in the liquid outlet pipeline is lower than the preset pressure value P1, and switch from the closed state to the open state when the pressure in the liquid outlet pipeline reaches the preset pressure value P1.

[0016] After adopting the above technical solution, the present invention has the following advantages:

[0017] 1. The present invention provides a portable electric sprayer equipped with a pressure controller and a pressure relief branch on the liquid outlet pipe. The pressure controller controls the preset pressure value P1 of the liquid outlet pipe during normal operation, ensuring the normal operation of the sprayer. The pressure relief branch is connected to the liquid outlet pipe. When the pressure in the liquid outlet pipe reaches the pressure relief value P2, the pressure relief valve opens, allowing the liquid in the liquid outlet pipe to be discharged promptly through the pressure relief valve. This prevents the liquid outlet pipe from bursting due to excessive pressure, greatly reduces the maintenance frequency of the sprayer, ensures the normal operation of the sprayer, and improves the user experience.

[0018] 2. The pressure relief branch is provided with a reflux pipe connected to the pressure relief valve at one end and to the liquid storage pot at the other end. When the liquid in the outlet pipe is discharged through the pressure relief valve, the discharged liquid can flow back into the liquid storage pot through the reflux pipe, thereby preventing the liquid from flowing out and allowing the discharged liquid to continue to be used, thereby improving the effective utilization rate of the liquid.

[0019] 3. Under normal circumstances, the spring pushes the valve ball against the valve seat. Under the action of the spring's preload, the valve ball presses against the valve seat and closes the valve hole. The valve hole is disconnected from the valve cavity, and the liquid in the outlet pipe cannot be discharged through the pressure relief valve. When the pressure in the outlet pipe reaches the pressure relief pressure value P2, the valve ball overcomes the spring's preload under the action of the liquid pressure and detaches from the valve seat to open the valve hole and deform the spring. The outlet pipe is connected to the valve cavity through the valve hole, and the liquid in the outlet pipe can be discharged through the valve hole and the valve cavity. When the pressure in the outlet pipe is lower than the pressure relief pressure value P2, the spring that recovers the deformation drives the valve ball toward the valve seat so that the valve ball presses against the valve seat again and closes the valve hole. The specific structure of the pressure relief valve is reasonably set to meet the pressure relief requirement of timely discharging the liquid when the pressure in the outlet pipe reaches the pressure relief pressure value P2.

[0020] 4. The pressure relief joint is connected to the valve body and is provided with a ridge that extends into the valve cavity. One end of the spring contacts the pressure relief joint to achieve positioning, while the other end of the spring contacts the valve ball, allowing the spring to act smoothly on the spring. The specific structure of the pressure relief valve is reasonably designed to meet the pressure relief requirements while reducing the difficulty of installing the spring and valve ball. The end of the spring that contacts the pressure relief joint is sleeved on the outside of the ridge. The ridge limits the end of the spring, which can improve the structural stability of the spring and thus improve the stability of the spring-driven movement of the valve ball.

[0021] 5. The pressure relief joint and the valve body are preferably connected together through threaded connection, which reduces the difficulty of assembly between the pressure relief joint and the valve body while ensuring the sealing connection effect between the two, so that the pressure relief valve can better meet the pressure relief requirements.

[0022] 6. The pressure relief valve is connected to the liquid outlet joint through a pressure relief pipe. One end of the pressure relief pipe is sleeved with the boss, and the other end of the pressure relief pipe is sleeved with the valve seat. The connection structure between the pressure relief valve and the liquid outlet pipeline is reasonably set to reduce the difficulty of assembly while allowing the pressure relief valve to be opened and closed in time according to the pressure of the liquid outlet pipeline.

[0023] 7. The pressure relief branch is preferably located downstream of the pressure controller, which is beneficial to improving the timeliness and accuracy of pressure relief.

[0024] 8. Reasonably set the difference between the pressure relief value P2 and the preset pressure value P1 to meet the requirements for timely pressure relief while avoiding bursts in the outlet pipeline due to excessive pressure. If P2-P1 is less than 0.1MPa, the pressure relief valve will open to relieve pressure when the liquid pressure in the outlet pipeline fluctuates normally. This frequent opening and closing of the pressure relief valve is not conducive to ensuring the service life of the pressure relief valve. If P2-P1 is greater than 1MPa, the pressure relief valve will only open to relieve pressure when the liquid pressure in the outlet pipeline is high, which is not conducive to ensuring timely pressure relief and is prone to bursts in the outlet pipeline due to high liquid pressure.

[0025] 9. When the pressure in the discharge line is lower than the preset pressure value P1, the two contacts of the pressure controller are closed, the motor connected in series with the pressure controller is in the open state, and the motor can drive the plunger pump to operate normally. When the pressure in the discharge line reaches the preset pressure value P1, the two contacts of the pressure controller are disconnected, the motor connected in series with the pressure controller is in the open state, the motor stops, and the plunger pump stops pumping liquid, preventing the motor from continuing to drive the plunger pump and causing the liquid pressure in the discharge line to increase. Reasonable setting of the pressure controller structure can effectively control the start and stop of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a diagram of the entire portable electric sprayer according to an embodiment of the present invention;

[0027] FIG2 is a partial structural diagram of a portable electric sprayer according to an embodiment of the present invention;

[0028] FIG3 is a structural diagram of a pumping assembly in a portable electric sprayer according to an embodiment of the present invention;

[0029] FIG4 is an exploded view of a pumping assembly in a portable electric sprayer according to Example 1;

[0030] FIG5 is a structural diagram of a plunger pump in a portable electric sprayer according to Example 1;

[0031] FIG6 is a schematic diagram of electrical connections of a portable electric sprayer according to Example 1;

[0032] FIG7 is a cross-sectional view of the pressure relief valve and the liquid outlet connector of the portable electric sprayer according to the first embodiment.

[0033] In the figure, 100-base, 110-receiving chamber, 120-power switch, 200-liquid storage pot, 210-pot body, 220-pot cover, 230-shoulder strap, 300-spray assembly, 310-nozzle, 320-spray head, 400-pumping assembly, 410-plunger pump, 411-inlet, 412-outlet, 420-motor, 430-liquid inlet pipe, 440-liquid outlet pipeline, 441-liquid outlet connector, 442-hose, 443-liquid outlet channel, 444 -convex column, 445-connecting hole, 450-transmission structure, 500-battery, 600-pressure controller, 610-contact piece, 700-pressure relief branch, 710-pressure relief valve, 711-valve seat, 712-valve hole, 713-valve body, 714-valve chamber, 715-valve ball, 716-spring, 717-pressure relief joint, 718-connecting channel, 719-convex edge, 720-return pipe, 730-pressure relief pipe, 810-handle, 820-operating switch. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following terms indicating orientations or positional relationships, such as "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," are based solely on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0035] Example 1

[0036] 1 to 7 , a portable electric sprayer according to a first embodiment of the present invention includes a base 100, a liquid storage pot 200 for holding liquid, a spray assembly 300 for atomizing and spraying the liquid, a pumping assembly 400 for pumping the liquid in the liquid storage pot 200 to the spray assembly 300, and a battery 500 for powering the device. The pumping assembly 400 includes a plunger pump 410, a motor 420 for driving the plunger pump 410, an inlet pipe 430 for connecting the liquid storage pot 200 and the inlet 411 of the plunger pump 410, and a liquid outlet pipeline 440 for connecting the outlet 412 of the plunger pump 410 and the spray assembly 300. The liquid outlet pipeline 440 is provided with a pressure controller 600 and a pressure relief branch 700. The pressure controller 600 is provided with a preset pressure value P1. The pressure relief branch 700 includes a pressure relief valve 710 connected to the liquid outlet pipeline 440. The pressure relief valve 710 is provided with a pressure relief pressure value P2. The pressure relief pressure value P2 is greater than or equal to the preset pressure value P1. The pressure relief valve 710 opens when the pressure in the liquid outlet pipeline 440 reaches the pressure relief pressure value P2 to discharge the liquid in the liquid outlet pipeline 440.

[0037] The pressure controller 600 controls the preset pressure value P1 of the liquid outlet pipe 440 during normal operation, ensuring the normal operation of the sprayer. A pressure relief branch 700 is connected to the liquid outlet pipe 440. When the pressure of the liquid in the liquid outlet pipe 440 reaches the relief pressure value P2, the pressure relief valve 710 opens, allowing the liquid in the liquid outlet pipe 440 to be discharged promptly through the pressure relief valve 710. This prevents the liquid outlet pipe 440 from bursting due to excessive pressure, significantly reduces the maintenance frequency of the sprayer, ensures the normal operation of the sprayer, and improves the user experience.

[0038] Referring to Figure 1 , in this embodiment, the liquid storage pot 200 comprises a pot body 210 and a pot lid 220. The pot body 210 has an open mouth on its top, and the pot lid 220 is used to open and close the mouth. To facilitate portability, the electric sprayer of this embodiment is designed as a backpack-style structure, and the liquid storage pot 200 is provided with a shoulder strap 230 for the user to carry. It is understood that the sprayer of this embodiment can also be configured as a handheld structure or other conveniently portable configuration, and this is not intended to be limiting.

[0039] 2 , the base 100 is formed with a receiving chamber 110, within which the pumping assembly 400 and the battery 500 are disposed. Referring to FIG1 , the spray assembly 300 includes a nozzle 310 and a spray head 320 disposed at one end of the nozzle 310. The other end of the nozzle 310 is connected to the end of a liquid outlet pipe 440 extending from the base 100. To facilitate user handling, a handle 810 with an operating switch 820 is disposed between the other end of the nozzle 310 and the liquid outlet pipe 440. Normally, the operating switch 820 is in a normally closed state, disconnecting the liquid outlet pipe 440 from the nozzle 310. When the user presses the operating switch 820, the operating switch 820 switches from the closed state to the open state, connecting the liquid outlet pipe 440 to the nozzle 310. It will be appreciated that the battery 500 may be directly fixed within the receiving chamber 110 or may be removably mounted within the receiving chamber 110.

[0040] The plunger pump 410 can adopt an existing single plunger pump or a double plunger pump, which will not be described in detail here. In conjunction with Figure 3, a transmission structure 450 is provided between the motor 420 and the plunger pump 410. The motor 420 drives the plunger of the plunger pump 410 to move back and forth through the transmission structure 450. The back-and-forth movement of the plunger causes the pressure in the pump chamber of the plunger pump 410 to change. It is understandable that the transmission structure 450 can adopt a reasonable structure such as a gear transmission structure, a planetary gear transmission structure, etc.

[0041] 2 and 5 , one end of a liquid inlet tube 430 extends from the bottom wall of the liquid reservoir 200 into the liquid reservoir 200 and communicates with the inner cavity of the liquid reservoir 200. The other end of the liquid inlet tube 430 communicates with the inlet 411 of the plunger pump 410. When the plunger of the plunger pump 410 moves backward, reducing the pressure in the pump cavity, the liquid in the liquid reservoir 200 flows into the pump cavity through the liquid inlet tube 430. When the plunger moves forward, increasing the pressure in the pump cavity, the liquid in the pump cavity flows through the liquid outlet pipe 440 to the spray assembly 300.

[0042] 4 and 7 , the liquid outlet pipeline 440 includes a liquid outlet connector 441 and a hose 442. The liquid outlet connector 441 is connected to the liquid outlet end of the plunger pump 410 and is provided with a liquid outlet channel 443 that communicates with the outlet 412. One end of the hose 442 is fixedly connected to the liquid outlet connector 441, and the other end is fixedly connected to the handle 810. The pressure controller 600 and the pressure relief branch 700 are provided on the liquid outlet connector 441. Preferably, the pressure relief branch 700 is provided downstream of the pressure controller 600. It is understood that the pressure relief branch 700 can also be provided upstream of the pressure controller 600.

[0043] 4 , the pressure relief branch 700 further includes a return pipe 720. One end of the return pipe 720 is connected to the pressure relief valve 710, and the other end is connected to the liquid reservoir 200. When the liquid in the liquid outlet line 440 is discharged through the pressure relief valve 710, the discharged liquid can flow back into the liquid reservoir 200 through the return pipe 720, preventing the liquid from flowing out while allowing the discharged liquid to continue to be utilized, thereby improving the effective utilization rate of the liquid. In conjunction with FIG7 , the pressure relief valve 710 includes a valve seat 711 having a valve hole 712, a valve body 713 having a valve cavity 714, a valve ball 715 for opening and closing the valve hole 712, and a spring 716 acting on the valve ball 715. The valve ball 715 and the spring 716 are disposed in the valve cavity 714, and the spring 716 presses the valve ball 715 toward the valve hole 712. When the valve ball 715 opens the valve hole 712, the valve hole 712 is connected to the valve cavity 714. When the valve ball 715 closes the valve hole 712, the valve hole 712 is disconnected from the valve cavity 714. The spring 716 is configured to deform when the valve ball 715 is separated from the valve seat 711 to open the valve hole 712, and to drive the valve ball 715 to contact the valve seat 711 to close the valve hole 712 when the pressure in the liquid outlet pipeline 440 is less than the pressure relief pressure value P2. Under normal circumstances, the spring 716 is in a compressed state and presses the valve ball 715 against the valve seat 711. Under the action of the preload force of the spring 716, the valve ball 715 presses against the valve seat 711 and closes the valve hole 712. The valve hole 712 is disconnected from the valve cavity 714, and the liquid in the liquid outlet pipeline 440 cannot be discharged through the pressure relief valve 710. When the pressure in the liquid outlet line 440 reaches the relief pressure value P2, the valve ball 715, under the action of the liquid pressure, overcomes the preload force of the spring 716 and disengages from the valve seat 711, opening the valve hole 712 and causing the spring 716 to deform. The liquid outlet line 440 communicates with the valve cavity 714 through the valve hole 712, and the liquid in the liquid outlet line 440 can be discharged through the valve hole 712 and the valve cavity 714. When the pressure in the liquid outlet line 440 falls below the relief pressure value P2, the spring 716, having recovered its deformation, drives the valve ball 715 toward the valve seat 711, causing the valve ball 715 to rest against the valve seat 711 again and close the valve hole 712. The specific structure of the pressure relief valve 710 is appropriately designed to meet the pressure relief requirement of timely discharge of liquid when the pressure in the liquid outlet line 440 reaches the relief pressure value P2.

[0044] In this embodiment, the pressure relief valve 710 is connected to the liquid outlet joint 441 through the pressure relief pipe 730. Specifically, the liquid outlet joint 441 is provided with a hollow protrusion 444 protruding outward. One end of the pressure relief pipe 730 is fixedly connected to the protrusion 444, and the other end of the pressure relief pipe 730 is fixedly connected to the valve seat 711. The hollow inner cavity of the protrusion 444 forms a connecting hole 445 for connecting the liquid outlet channel 443 and the valve hole 712. In this embodiment, the valve body 713 and the valve seat 711 are preferably integrally formed. It is understandable that the valve body 713 and the valve seat 711 can also be formed separately and then fixed together. It is understandable that the valve seat 711 can also be directly connected to the liquid outlet joint 441 through a structure such as threaded fitting.

[0045] 7 , the pressure relief valve 710 further includes a pressure relief connector 717 connected to the valve body 713. One end of the pressure relief connector 717 is fixedly connected to the valve body 713, and the other end of the pressure relief connector 717 is fixedly connected to the return pipe 720. The pressure relief connector 717 is provided with a communication channel 718 for connecting the valve cavity 714 with the return pipe 720. Specifically, the pressure relief connector 717 and the valve body 713 are preferably fixedly connected via a threaded fit. The end of the pressure relief connector 717 connected to the valve body 713 is provided with a flange 719 that extends into the valve cavity 714. One end of a spring 716 is sleeved around the flange 719 and contacts the pressure relief connector 717, while the other end of the spring 716 contacts the valve ball 715. The flange 719 limits the end of the spring 716, thereby improving the structural stability of the spring 716 and thereby enhancing the stability of the spring 716 in driving the valve ball 715. It is understandable that the pressure relief joint 717 and the valve body 713 may also be fixedly connected via other structures.

[0046] 2 and 6 , the base 100 is provided with a power switch 120. The battery 500, motor 420, pressure controller 600, and power switch 120 are connected in series. The pressure controller 600 has two opposing contacts 610. When the electric sprayer is in use, pressing the power switch 120 causes the battery 500 to supply power to the motor 420. When the pressure of the liquid in the outlet pipe 440 falls below a predetermined pressure value P1, the two contacts 610 of the pressure controller 600 enter a closed state, contacting each other. The motor 420, which is connected in series with the pressure controller 600, enters a state of flow, allowing the motor 420 to drive the plunger pump 410 to operate normally. When the pressure in the outlet pipe 440 reaches the predetermined pressure value P1, the two contacts 610 of the pressure controller 600 switch from a closed state to a disconnected state, disengaging the motor 420, which is connected in series with the pressure controller 600, enters an open state, shutting down the motor 420, and stopping the plunger pump 410 from pumping liquid.

[0047] In order to meet the requirement of timely pressure relief while avoiding the possibility of bursting the outlet pipe 440 due to excessive pressure, the difference between the preset pressure value P1 and the pressure relief pressure value P2 needs to be reasonably set. In this embodiment, 0.1 MPa ≤ P2 - P1 ≤ 1 MPa. Preferably, the preset pressure value P1 can be set to 2 MPa, and the pressure relief pressure value P2 can be set to 2.5 MPa, that is, P2 - P1 is set to 0.5 MPa. It is understandable that the preset pressure value P1 can also be set to other reasonable sizes such as 1MPa, 1.3MPa, 1.5MPa, 1.7MPa, 1.9MPa, 2.1MPa, 2.3MPa, 2.5MPa, 2.7MPa, 3MPa, etc., and P2-P1 can also be set to other reasonable differences such as 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1MPa, etc.

[0048] In this embodiment, since the sealing between the liquid reservoir 200 and the base 100 needs to consider both the inlet and return sealing, in order to reduce the difficulty of sealing, the liquid reservoir 200 is preferably fixed to the base 100. It is understandable that the liquid reservoir 200 can also be detachably mounted on the base 100, provided that the sealing requirements are met.

[0049] When using the electric sprayer of this embodiment, the liquid to be sprayed can be first loaded into the liquid storage pot 200, and then the power switch 120 can be turned on. When the pressure in the liquid outlet pipe 440 is less than the preset pressure value P1, the two contacts 610 in the pressure controller 600 are in a closed state and the pressure relief valve 710 is in a closed state. The motor 420 is in a passage state. The motor 420 can drive the plunger pump 410 to work normally. When the plunger pump 410 is working, the liquid in the liquid storage pot 200 flows into the plunger pump 410 through the liquid inlet pipe 430. The liquid flowing into the plunger pump 410 flows to the spray assembly 300 through the liquid outlet pipe 440 after being pressurized. When the user holds the handle 810 and presses the operation switch 820, the pressurized liquid flows to the nozzle 320 through the nozzle 310 and is sprayed out after being atomized by the nozzle 320. When the pipeline is blocked or other conditions occur, preventing the liquid in the liquid outlet pipeline 440 from being discharged, causing the pressure in the liquid outlet pipeline 440 to reach the relief pressure value P2, the valve ball 715, under the action of the liquid pressure, overcomes the preload force of the spring 716 and separates from the valve seat 711, opening the valve hole 712 and causing the spring 716 to deform under the force. The liquid outlet channel 443 on the liquid outlet connector 441 communicates with the valve cavity 714 through the valve hole 712, and the liquid in the liquid outlet pipeline 440 can be discharged through the pressure relief valve 710. The discharged liquid can then flow back into the liquid storage pot 200 through the pressure relief valve 710 and the return pipe 720. When the pressure in the liquid outlet pipeline 440 is lower than the relief pressure value P2, the spring 716, which has recovered its deformation, drives the valve ball 715 toward the valve seat 711, causing the valve ball 715 to rest against the valve seat 711 again and close the valve hole 712.

[0050] It is understandable that the electric sprayer of this embodiment may also eliminate the provision of the return pipe 720. In this case, the liquid discharged through the pressure relief valve 710 is directly discharged to the outside of the electric sprayer.

[0051] In addition to the above preferred embodiments, the present invention has other implementation modes. Those skilled in the art can make various changes and modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope defined in the claims of the present invention.

Claims

1. A portable electric sprayer, comprising a base, a liquid storage pot for holding liquid, a spray assembly for atomizing and spraying the liquid, a pumping assembly for pumping the liquid in the liquid storage pot to the spray assembly, and a battery for power supply, wherein the pumping assembly comprises a plunger pump, a motor for driving the plunger pump, a liquid inlet pipe for connecting the liquid storage pot and the inlet of the plunger pump, and a liquid outlet pipe for connecting the outlet of the plunger pump and the spray assembly, characterized in that: The liquid outlet pipeline is provided with a pressure controller and a pressure relief branch. The pressure controller is provided with a preset pressure value P1. The pressure relief branch includes a pressure relief valve connected to the liquid outlet pipeline. The pressure relief valve is provided with a pressure relief pressure value P2. The pressure relief pressure value P2 is greater than or equal to the preset pressure value P1. The pressure relief valve opens to discharge the liquid in the liquid outlet pipeline when the pressure in the liquid outlet pipeline reaches the pressure relief pressure value P2.

2. A portable electric sprayer according to claim 1, characterized in that: The pressure relief branch comprises a reflux pipe, one end of which is connected to the pressure relief valve and the other end of which is connected to the liquid storage pot.

3. A portable electric sprayer according to claim 1, characterized in that: The pressure relief valve includes a valve seat with a valve hole, a valve body with a valve cavity, a valve ball for opening and closing the valve hole, and a spring acting on the valve ball. The valve ball and the spring are arranged in the valve cavity and the spring pushes the valve ball toward the valve hole. When the valve ball opens the valve hole, the valve hole is connected to the valve cavity, and when the valve ball closes the valve hole, the valve hole is disconnected from the valve cavity. The spring is configured to be deformed by force when the valve ball leaves the valve seat to open the valve hole, and to drive the valve ball to contact the valve seat to close the valve hole when the pressure in the liquid outlet pipeline is less than the pressure relief pressure value P2.

4. A portable electric sprayer according to claim 3, characterized in that: The pressure relief valve includes a pressure relief joint connected to the valve body, one end of the pressure relief joint is provided with a convex edge extending into the valve cavity, one end of the spring is sleeved on the outside of the convex edge and contacts the pressure relief joint, and the other end of the spring contacts the valve ball.

5. A portable electric sprayer according to claim 4, characterized in that: The pressure relief joint is connected to the valve body through threaded fitting.

6. A portable electric sprayer according to claim 3, characterized in that: The liquid outlet pipeline includes a liquid outlet joint connected to the plunger pump and a hose for connecting the liquid outlet joint and the spray assembly. The pressure controller is arranged on the liquid outlet joint. The liquid outlet joint is provided with a convex column protruding outward and hollow. The pressure relief valve is connected to the liquid outlet joint through a pressure relief pipe. One end of the pressure relief pipe is sleeved with the convex column and the other end is sleeved with the valve seat.

7. A portable electric sprayer according to claim 3, characterized in that: The valve body and the valve seat are integrally formed.

8. A portable electric sprayer according to claim 1, characterized in that: The pressure relief branch is arranged downstream of the pressure controller.

9. A portable electric sprayer according to claim 1, characterized in that: 0.1MPa≤P2-P1≤1MPa.

10. A portable electric sprayer according to claim 1, characterized in that: The pressure controller is connected in series with the motor and has two contacts. The two contacts are in a closed state when the pressure in the liquid outlet pipeline is lower than a preset pressure value P1. The two contacts switch from a closed state to an open state when the pressure in the liquid outlet pipeline reaches the preset pressure value P1.

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