A nebulizer

Abstract

The utility model provides a kind of sprayer, with the spray gun main body that can be used to suck and spray out liquid in container, the inlet valve of this spray gun main body is elastomer, including valve body, valve body is divided into two parts from top to bottom according to the change of cross section from big to small: the sealing part for closing the outlet of the water inlet channel, the flat part that is adapted to the inner wall of the mounting seat, the inflow section for liquid inflow is provided in the central of the flat part, in the state that liquid flows to inflow section, liquid can force flat part to move upwards and make sealing part move up, and make the outlet of water inlet channel be opened.The cross section of the valve body of the sprayer is designed as big up and small down, combined with the valve body using elastomer, after inlet valve resets and closes the outlet of water inlet channel, because liquid filled in cylinder portion provides the tendency of sealing part to move down above sealing part, sealing part deforms and the sealing between mounting seat is surface contact, ensure the reliability of sealing, avoid liquid in cylinder portion backflow.

Description

Technical Field

[0001] This utility model relates to the field of sprayer technology, and in particular to a pump sprayer that is manually operated by a trigger lever. Background Technology

[0002] A sprayer is a miniature sprayer that utilizes the movement of a piston within a pump body. This movement causes gas to flow within the pump body, reducing its pressure while maintaining a constant pressure outside. This pressure difference creates a pressure differential, which guides the liquid out of the pump body. When the liquid encounters the high-speed airflow, it is instantly atomized. For example, Chinese Patent ZL201620317419.6 discloses "A Spray Gun Body." These spray guns / sprayers all rely on a trigger lever operated by the user's hand, and the trigger lever actuates the spray... clamp A pump that draws liquid from a container and eventually ejects the liquid through a delivery nozzle, with valves for fluid suction and delivery located inside or upstream of the pump chamber, adapted to allow fluid to be drawn from the container into the pump chamber and delivered from the pump chamber toward the delivery nozzle in a selective and unidirectional manner.

[0003] However, to ensure that the fluid is drawn from the container into the pump chamber in a unidirectional manner, the aforementioned sprayer... clamp The sprayer is equipped with a liquid outlet check valve, which is often a metal ball valve. However, when the sprayer is in use, this metal ball valve is exposed to a humid environment, making it prone to corrosion and failure. This can lead to backflow of liquid from the pump chamber into the container. Adding a coating or using a corrosion-resistant alloy to the metal ball valve would increase costs. Furthermore, since the spray gun body is made of plastic, the difference in thermal expansion coefficients between metal and plastic during prolonged use can cause the metal ball valve to fail or loosen, resulting in backflow. While using plastic or rubber ball valves avoids corrosion and thermal expansion coefficient differences, the lower density of plastic or rubber makes the ball valve lighter and less likely to ensure accurate repositioning, still resulting in backflow.

[0004] Furthermore, since the aforementioned sprayer requires the fluid to be drawn from the container into the pump chamber before being delivered from the pump chamber to the delivery nozzle, if the triggering distance of the trigger rod is insufficient, the liquid in the pump chamber cannot be completely delivered to the nozzle, resulting in liquid residue in the pump chamber. This residual liquid will leak out from the delivery nozzle when the sprayer is inverted or tilted. Utility Model Content

[0005] The first technical problem to be solved by this invention is to provide a sprayer that can prevent liquid backflow, in light of the existing technology described above.

[0006] The second technical problem to be solved by this utility model is to provide a sprayer that can prevent leakage, in view of the above-mentioned existing technology.

[0007] The technical solution adopted by this utility model to solve the technical problem is as follows: The sprayer has a spray gun body capable of sucking up and spraying liquid from a container. The spray gun body includes a cylinder section, and the spray gun body is also provided with an inlet pipe for introducing liquid from the container into the cylinder section. An inlet valve is provided in the water inlet channel between the inlet pipe and the cylinder section. The inlet valve is characterized in that: the inlet valve is an elastic body, including a valve body. A mounting seat for installing the valve body is provided in the water inlet channel. The valve body is divided into two parts from top to bottom according to the change in cross-section from large to small: a sealing part for closing the outlet of the water inlet channel, and a straight part adapted to the inner wall of the mounting seat. An inlet section for liquid to flow in is provided in the center of the straight part. When the liquid flows into the inlet section, the liquid can force the straight part to move upward, causing the sealing part to move upward, thereby opening the outlet of the water inlet channel.

[0008] To enable the inlet valve to open the outlet of the inlet channel, preferably, the inner wall of the mounting base is provided with at least two protruding ribs spaced circumferentially. A fluid channel communicating with the inlet channel is formed between adjacent ribs. By moving the straight portion upwards, the fluid channel is opened, and liquid flows from the inlet pipe to the cylinder section through the outlet of this fluid channel. Due to the design of the fluid channel between the ribs, after the liquid flows towards the inlet section and forces the sealing portion upwards, the outlet of the fluid channel is opened, allowing liquid to flow from the inlet pipe to the cylinder section via the fluid channel.

[0009] Furthermore, a raised ring extends radially outward from the lower end of the straight section. This raised ring abuts against the raised strip, preventing the straight section from moving upward further. The cooperation of the raised ring and the raised strip gives the raised strip a dual function: first, as mentioned above, a fluid channel is formed between adjacent raised strips, which can be opened by the upward movement of the sealing section, allowing liquid to flow from the inlet pipe through this fluid channel to the cylinder section; second, after the straight section moves upward, the raised ring at the lower end of the straight section abuts against the raised strip, preventing the straight section from moving upward further. This confines the inlet valve within the mounting base when liquid forces the straight section to move upward, improving structural stability.

[0010] In order to place the mounting base inside the water inlet channel, from the perspective of structural simplicity, preferably, the mounting base is formed by the inward narrowing of the inner wall of the water inlet channel.

[0011] To facilitate the reset of the inlet valve, preferably, the mounting base has a guide portion for guiding the reset of the inlet valve, the guide portion being inclined inward from top to bottom. When the inlet valve falls to reset, the guide portion can guide the fall of the inlet valve, ensuring that the sealing part can close the fluid passage.

[0012] To address the second technical problem mentioned above, preferably, the spray gun body further includes a nozzle section for spraying liquid, and an outlet valve for closing the inlet of the water outlet channel is provided on the water outlet channel between the cylinder section and the nozzle section. When liquid is pushed into the water outlet channel, the liquid can force the outlet valve to flex and / or move, thus opening it. Water outlet channel The outlet valve is designed to close the inlet of the water outlet channel, blocking the flow of liquid from the cylinder section to the nozzle section. The water outlet channel is opened only when the release rod forces the liquid in the cylinder section to flow into the water outlet channel and generates sufficient pressure to force the outlet valve to flex and / or move. The liquid then flows into the nozzle section and is ejected from the nozzle section, preventing leakage of residual liquid in the cylinder section.

[0013] The outlet valve can be configured to open / close any structure of the water outlet channel. As one type of outlet valve, the outlet valve includes, from bottom to top, a skirt portion with a downward-facing opening, a bowl-shaped deformation portion directly connected to the skirt portion with an upward-facing opening, and a resting portion directly connected to the bowl-shaped deformation portion. The skirt portion can close the inlet of the water outlet channel. Correspondingly, the spray gun body is provided with an inner step for the resting portion to rest on. When liquid is pushed into the water outlet channel, the liquid can force the bowl-shaped deformation portion to partially flex upward, thereby causing the skirt portion to move upward and opening the inlet of the water outlet channel. After the liquid flows out from the cylinder section, it exerts an upward thrust on the skirt section from below, forcing the cup-shaped deformation section above the skirt section to partially flex upward and move the skirt section upward, thereby opening the inlet of the water outlet channel, allowing the liquid to enter the water outlet channel and be sprayed out from the nozzle section; after the spraying is completed, the cup-shaped deformation section and the skirt section lose the thrust of the liquid and return to their original positions, and the skirt section closes the inlet of the water outlet channel again.

[0014] Furthermore, a switching valve is provided above the inlet pipe. The switching valve includes a valve seat, a valve ball, and an inverted liquid pumping port formed in the valve seat, enabling the sprayer to operate in either upright or inverted mode. The switching valve provides the sprayer with two operating modes: upright and inverted, broadening its application range.

[0015] To connect the switching valve to the inlet pipe, preferably, the switching valve is constructed on a connecting member, which is positioned at the upper end of the inlet pipe. The inlet pipe is detachably inserted into the lower part of the connecting member. The upper part of the connecting member has a first pipe body and a second pipe body arranged at intervals. At least a portion of the first pipe body constitutes the valve seat, and the second pipe body is inserted into the water inlet channel. The switching valve is configured such that: when the sprayer is in an upward upright position, the valve ball closes the inverted liquid pumping port, thereby allowing fluid communication between the inlet pipe, the second pipe body, and the water inlet channel; and when the sprayer is in a downward inverted position, the valve ball moves downward to open the inverted liquid pumping port, thereby allowing fluid communication between the first pipe body, the second pipe body, and the water inlet channel. Integrating the switching valve structure into the upper part of the connecting component has several advantages. First, it reduces the internal structure of the spray gun body. Second, when the sprayer is in an upright position, the valve ball of the switching valve closes the inverted liquid pumping port on the valve seat, preventing liquid from flowing to the inverted liquid pumping port during cylinder suction, thus reducing the amount of liquid flowing to the water inlet chamber and effectively improving the liquid loading speed. Third, in the inverted mode, the valve ball opens the inverted liquid pumping port on the valve seat, allowing liquid to directly enter the valve seat through the inlet pipe and ultimately enter the water inlet channel, enabling the inverted mode to be realized.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] 1. The sprayer has a valve body with a cross-section that is larger at the top and smaller at the bottom. That is, the cross-section of the sealing part is larger than that of the straight part. Combined with the use of an elastic body in the valve body, after the inlet valve resets and closes the outlet of the water inlet channel, the liquid filling the cylinder provides a downward tendency for the sealing part to move, causing the sealing part to deform and make surface contact with the mounting base, ensuring the reliability of the seal and preventing the liquid in the cylinder from flowing back.

[0018] 2. Due to the deformation of the valve body, there is a surface contact between it and the mounting base. Even if there is a thermal expansion difference between the valve body and the spray gun body, the pressure of the liquid in the cylinder on the sealing part can be further pressed downward to compensate for the gap caused by the thermal expansion difference, thus avoiding the problem of insufficient sealing in the prior art. At the same time, since an elastomer is used as the valve body, the phenomenon of valve body corrosion is also avoided.

[0019] 3. The design of the straight section in the inlet valve provides guidance for the reset of the inlet valve, so that the inlet valve can only move up and down along the inner wall of the mounting seat without rotating or deviating. The design of the inflow section in the straight section can also further ensure that the inlet valve can only move up and down, ensuring that the sealing part can close the outlet of the water inlet channel after reset, thus improving the reliability of the structure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the sprayer in Embodiment 1 of this utility model;

[0021] Figure 2 This is a top view of the sprayer in Embodiment 1 of this utility model;

[0022] Figure 3 for Figure 2 Sectional view at point AA;

[0023] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 for Figure 4 Exploded view of the inlet valve and mounting base;

[0025] Figure 6 for Figure 3 Enlarged view of point C in the middle;

[0026] Figure 7 This is a schematic diagram of the switching valve in Embodiment 1 of this utility model;

[0027] Figure 8 This is a schematic diagram of the liquid inlet state in the upright mode of the sprayer in Embodiment 1 of this utility model;

[0028] Figure 9 This is a schematic diagram of the spraying state in the upright mode of the sprayer in Embodiment 1 of this utility model;

[0029] Figure 10 This is a schematic diagram of the liquid inlet state in the inverted mode of the sprayer in Embodiment 1 of this utility model;

[0030] Figure 11 This is a schematic diagram of the spraying state in the inverted mode of the sprayer in Embodiment 1 of this utility model;

[0031] Figure 12 This is a schematic diagram of the outlet valve in Embodiment 2 of this utility model. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to specific embodiments.

[0033] Example 1

[0034] like Figures 1-11 The present invention is shown as the preferred embodiment.

[0035] The structure and function of the sprayer will be further explained below.

[0036] The sprayer of this utility model has the following functions: when installed on a container (not shown), and with the cylinder 11 filled with liquid, the piston 18 is moved to the right side of the figure by rotating the wrench 17, pressurizing the liquid in the cylinder 11 (at this time, the valve structure is open), causing the liquid to be sprayed out from the nozzle 14. In order to meet the user's needs, the nozzle 14 can spray, spray water, or be closed. For this purpose, a connector 19 is provided on the nozzle 14. By adjusting the rotation angle of the connector 19 relative to the nozzle 14, the nozzle 14 can achieve at least one of the following spray states: spraying or closed. Alternatively, in the direction of liquid spraying, the nozzle 14 is provided with a mesh structure downstream of the spray nozzle that can convert the spray state into a foam state. This mesh structure can also enable the nozzle 14 to spray foam.

[0037] Conversely, by resetting the wrench 17, the piston 18 moves upstream (to the left in the figure), creating a negative pressure in the cylinder section 11, thereby filling the cylinder section 11 with liquid from the container (at this time, the valve structure is closed).

[0038] Regarding the structure, see Figure 1-3 The sprayer is used to draw in and spray liquid from a container, and includes: a spray gun body 1, an inlet tube 2, and a cover 7. The spray gun body 1 includes: a nozzle section 14, a cylinder section 11, a piston 18, a wrench 17, and a resilient member 10 for resetting. Specifically, the spray gun body 1 is provided with an inlet tube 2 for guiding liquid from the container into the cylinder section 11 and a nozzle section 14 for spraying liquid. It also includes a cylinder section 11 that is in fluid communication with the inlet tube 2 and stores liquid; a piston 18 that is reciprocally movable at the outer end of the cylinder section 11 and forms a sealed inner cavity within the cylinder section 11; and a wrench 17 located on one side of the piston 18. The wrench 17 is used to push the piston 18 into the cylinder section 11, and the resilient member 10 is connected to the wrench 17 for resetting.

[0039] The sprayer also has an inlet valve 3 in the water inlet channel 12 between the inlet pipe 2 and the cylinder section 11, and an outlet valve 4 in the water outlet channel 15 between the cylinder section 11 and the nozzle section 14. The inlet valve 3 can close the outlet of the water inlet channel 12 in one direction so that the liquid can only flow into the cylinder section 11 from the inlet pipe 2 in one direction, thus preventing backflow of liquid. The outlet valve 4 can close the inlet of the water outlet channel 15 to prevent residual liquid in the cylinder section 11 from causing leakage.

[0040] First, the structure of inlet valve 3 will be explained. (See attached image) Figure 4-5The inlet valve 3 of the sprayer is an elastic body, including a valve body. A mounting seat 13 for mounting the valve body is provided inside the water inlet channel 12. The valve body is divided into two parts from top to bottom according to the change in cross-section from large to small: a sealing part 31 for closing the outlet of the water inlet channel 12, and a straight part 32 adapted to the inner wall of the mounting seat 13. An inlet section 33 for liquid to flow into is provided in the center of the straight part 32. When liquid flows into the inlet section 33, the liquid forces the straight part 32 to move upward, causing the sealing part 31 to move upward, thus opening the outlet of the water inlet channel 12. In actual use, by resetting the wrench 17, the piston 18 moves upstream (left side in the figure), creating negative pressure in the cylinder 11. Liquid in the container enters the water inlet channel 12 through the inlet pipe 2, forcing the inlet valve 3 to move upward and open the outlet of the water inlet channel 12, allowing liquid to enter the cylinder 11. Then, the inlet valve 3 loses the liquid's push and resets under gravity, closing the outlet of the water inlet channel 12. The sprayer's valve body is designed with a cross-section that is larger at the top and smaller at the bottom. Specifically, the cross-section of the sealing part 31 is larger than that of the straight part 32. Combined with the use of an elastomer in the valve body, after the inlet valve 3 resets and closes the outlet of the water inlet channel 12, the liquid filling the cylinder 11 provides a downward tendency for the sealing part 31, causing the sealing part 31 to deform under pressure against the mounting base 13. This results in a surface contact seal between the sealing part 31 and the mounting base 13, ensuring the reliability of the seal and preventing backflow of liquid in the cylinder. This surface contact sealing method can also compensate for insufficient sealing caused by differences in thermal expansion of different materials. At the same time, the design of the straight part 32 provides a guiding effect for the reset of the inlet valve 3, allowing the inlet valve 3 to move only up and down along the inner wall of the mounting base 13 without rotation or displacement. The design of the inflow section 33 within the straight part 32 further ensures that the inlet valve 3 can only move up and down, ensuring that the sealing part 31 can close the outlet of the water inlet channel 12 after reset.

[0041] The specific structure is as follows: the mounting base 13 is formed by the inner wall of the water inlet channel 12 being partially narrowed inward, and has a guide portion 133 that is inclined inward from top to bottom. The guide portion 133 is used to guide the reset of the inlet valve 3, so that when the inlet valve 3 falls, it falls along the guide portion 133 and finally contacts the mounting base 13 to form a seal and close the outlet of the water inlet channel 12. The inner wall of the mounting base 13 is provided with two protruding ribs 131 at intervals along the circumference. The ribs 131 have a dual function: First, a fluid channel 132 connected to the water inlet channel 12 is formed between the ribs 131. By moving the straight part 32 upward, the fluid channel 132 is opened, and the liquid flows from the inlet pipe 2 to the cylinder part 11 through the outlet of the fluid channel 132. Second, a ring 34 extends radially outward from the lower end of the straight part 32. The ring 34 can abut against the ribs 131 and prevent the straight part 32 from moving upward. Thus, when the liquid can force the straight part 32 to move upward, the inlet valve 3 can be confined within the mounting base 13, improving the stability of the structure.

[0042] Next, the structure of the outlet valve 4 will be described. The outlet valve 4 can close the inlet of the water outlet channel 15, blocking the flow of liquid from the cylinder section 11 to the nozzle section 14 through the water outlet channel 15. When the lever 17 is turned to cause the piston 18 to push the liquid in the cylinder section 11 towards the water outlet channel 15, the liquid forces the outlet valve 4 to flex and / or move, opening the inlet of the water outlet channel 15, allowing the liquid to flow to the nozzle section 14 to complete the spraying action. For the specific structure of the outlet valve 4 in this embodiment, please refer to [link to specific details]. Figure 6 The outlet valve 4 includes, from bottom to top, a skirt 41 with its opening facing downwards, a bowl-shaped deformation part 42 directly connected to the skirt 41 with its opening facing upwards, and a resting part 43 directly connected to the bowl-shaped deformation part 42. The skirt 41 can close the inlet of the water outlet channel 15. The spray gun body 1 is provided with an inner step 16 for the resting part 43 to rest on. When the liquid is pushed towards the water outlet channel 15, the liquid can force the bowl-shaped deformation part 42 to partially flex upwards, thereby causing the skirt 41 to move upwards, which in turn opens the inlet of the water outlet channel 15. After the liquid enters the water outlet channel 15, it is sprayed out from the nozzle part 14 to complete the spraying action. After the spraying is completed, the bowl-shaped deformation part 42 and the skirt 41 lose the thrust of the liquid and return to their original positions. The skirt 41 closes the inlet of the water outlet channel 15 again.

[0043] In addition to the above structure, the applicant has also made a technical improvement to the sprayer by incorporating an inverting device, namely: a switching valve 5 is placed above the inlet pipe 2. With the help of the switching valve 5, the sprayer has two working modes: upright mode and inverted mode, which broadens the application range of the sprayer.

[0044] The structure of switching valve 5 will be described below. (See attached image.) Figure 7The switching valve 5 is constructed on the connecting member 6 and includes a valve seat 51, a valve ball 52, and an inverted liquid pumping port 53 formed in the valve seat 51. Specifically, the connecting member 6 is positioned at the upper end of the inlet pipe 2, and the inlet pipe 2 is detachably inserted into the lower part of the connecting member 6. The upper part of the connecting member 6 has a first pipe body 61 and a second pipe body 62 arranged at intervals. The upper part of the first pipe body 61 forms the valve seat 51, and the second pipe body 62 is inserted into the water inlet channel 12. By integrating the structure of the switching valve 5 into the upper part of the connecting member 6, the internal structure of the spray gun body 1 is reduced. The switching valve 5 is configured such that: when the sprayer is in the upward upright position, the valve ball 52 closes the inverted liquid pumping port 53, thereby allowing fluid communication between the inlet pipe 2, the second pipe body 62, and the water inlet channel 12; and when the sprayer is in the downward inverted position, the valve ball 52 moves downward to open the inverted liquid pumping port 53, thereby allowing fluid communication between the first pipe body 61, the second pipe body 62, and the water inlet channel 12. When the sprayer is in the upright position, the valve ball 52 of the switching valve 5 closes the inverted liquid pumping port 53 on the valve seat 51, which prevents the liquid from flowing to the inverted liquid pumping port 53 when the cylinder part 11 draws liquid, thus reducing the amount of liquid flowing to the water inlet chamber and effectively improving the liquid feeding speed. In the inverted mode, the ball of the switching valve 5 opens the inverted liquid pumping port 53 on the valve seat 51, and the liquid can directly enter the valve seat 51 through the inlet pipe 2 and finally enter the water inlet channel 12, so that the inverted mode can be realized.

[0045] In summary, the spraying process of this sprayer is as follows: First, the user can adjust the nozzle section 14 with a mesh structure according to whether foam generation is required. Then, according to the usage requirements, the user selects the indicator icon corresponding to the connector 19 on the nozzle section 14 to spray or turn off the spray. After adjusting the rotation angle of the connector 19, if the user needs to spray in an upright mode, press the wrench 17 to add liquid. The inlet valve 3 is forced open, and the liquid enters the cylinder section 11 from the container through the inlet pipe 2, the water inlet channel 12, and the fluid channel 132 (see...). Figure 8 The reduced pressure generated in the cylinder section 11 is used as power to drive the liquid from the fluid-connected container into the cylinder section 11 to reach a fixed quantity. The liquid in the cylinder section 11 instantly blocks the outlet valve 4, which can effectively prevent the liquid from flowing back towards the container.

[0046] Pressing the wrench 17 again, due to the incompressibility of the liquid, forces the piston 18 to move downstream (to the right in the figure) while the wrench 17 is pressed. This causes the bowl-shaped deformation part 42 of the outlet valve 4 to deform, the skirt part 41 to move upwards, and the inlet of the water outlet channel 15 to open. Liquid then flows from the cylinder part 11 through the water outlet channel 15 and is ejected from the nozzle part 14 (see...). Figure 9 );

[0047] If the user needs to spray in an inverted mode, the flow path is different from the upright mode. Pressing the wrench 17 to add liquid, the liquid inlet process of the cylinder 11 is as follows: the liquid flows from the first tube 61 to the water inlet channel 12 and then enters the cylinder 11 (see...). Figure 10 Whether inverted or upright, once the liquid filling cylinder 11 has further actuation energy, it pushes the liquid into the outlet channel 15 (see...). Figure 11 When the wrench 17 is pressed again to spray out the liquid, the process is the same as when the sprayer is in the upright position. At this time, the outside air is connected to the container through the air inlet to achieve air pressure balance. When the wrench 17 is stopped, the wrench 17 is reset by the reset action of the elastic element 10. At this time, the piston 18 can return to its original position, and the inlet valve 3 and the outlet valve 4 can return to their original unacted positions, thereby preventing the liquid from flowing through the valves. The liquid in the container is then refilled into the cylinder section 11.

[0048] Example 2

[0049] The structure is basically the same as that of the embodiment, the only difference being that: the outlet valve 4' of this embodiment includes a valve seat 41' and a valve body 42'. The valve seat 41' and the spray gun body 1 are aligned to hold the valve body 42' in the proper position. The valve body 42' includes, from bottom to top, a skirt portion 421' with an opening facing downward, a deformation portion 422' directly connected to the skirt portion 421', and a rest portion 423' directly connected to the deformation portion 422' (see...). Figure 12 The skirt portion 421' can close the inlet of the water outlet channel. When liquid is pushed into the water outlet channel, the liquid can force the deformable portion 422' to partially flex upward, thereby moving the skirt portion 421' upward and opening the inlet of the water outlet channel. The valve seat 41' is provided with an action portion 411', which can prevent the deformable portion 422' from continuing to flex, so as to avoid the deformable portion 422' from undergoing inelastic deformation and failing to return to its original position, thereby preventing the skirt portion 421' from closing the inlet of the water outlet channel.

Claims

1. A sprayer having a spray gun body (1) capable of drawing in and spraying liquid from a container, the spray gun body (1) including a cylinder section (11), and the spray gun body (1) further having an inlet pipe (2) for introducing liquid from the container into the cylinder section (11), and an inlet valve (3) provided in a water inlet channel (12) between the inlet pipe (2) and the cylinder section (11), characterized in that: The inlet valve (3) is an elastic body, including a valve body. The water inlet channel (12) is provided with a mounting seat (13) for installing the valve body. The valve body is divided into two parts from top to bottom according to the change of cross-section from large to small: a sealing part (31) for closing the outlet of the water inlet channel (12) and a straight part (32) adapted to the inner wall of the mounting seat (13). The straight part (32) is provided with an inlet section (33) for liquid to flow in. When the liquid flows to the inlet section (33), the liquid can force the straight part (32) to move upward and the sealing part (31) to move upward, thereby opening the outlet of the water inlet channel (12).

2. The sprayer according to claim 1, characterized in that: The inner wall of the mounting base (13) is provided with at least two protruding ribs (131) spaced apart in the circumferential direction. A fluid channel (132) communicating with the water inlet channel (12) is formed between adjacent ribs (131). By moving the straight part (32) upward, the fluid channel (132) is opened, and liquid flows from the inlet pipe (2) to the cylinder part (11) through the outlet of the fluid channel (132).

3. The sprayer according to claim 2, characterized in that: The lower end of the straight portion (32) has a convex ring (34) extending radially outward. The convex ring (34) can abut against the convex strip (131) and prevent the straight portion (32) from moving upward when they abut against each other.

4. The sprayer according to claim 3, characterized in that: The mounting base (13) is formed by the inward narrowing of the inner wall of the water inlet channel (12).

5. The sprayer according to claim 4, characterized in that: The mounting base (13) has a guide portion (133) for guiding the reset of the inlet valve (3), and the guide portion (133) is inclined inward from top to bottom.

6. The sprayer according to any one of claims 1 to 5, characterized in that: The spray gun body (1) also includes a nozzle part (14) for spraying liquid. The water outlet channel (15) between the cylinder part (11) and the nozzle part (14) is provided with an outlet valve (4) for closing the inlet of the water outlet channel (15). When the liquid is pushed into the water outlet channel (15), the liquid can force the outlet valve (4) to flex and / or move to open the inlet of the water outlet channel (15).

7. The sprayer according to claim 6, characterized in that: The outlet valve (4) includes, from bottom to top, a skirt cover (41) with its opening facing downwards, a bowl-shaped deformation part (42) directly connected to the skirt cover (41) and with its opening facing upwards, and a resting part (43) directly connected to the bowl-shaped deformation part (42). The skirt cover (41) can close the inlet of the water outlet channel (15). Correspondingly, the spray gun body (1) is provided with an inner step (16) for the resting part (43) to rest on. When the liquid is pushed into the water outlet channel (15), the liquid can force the bowl-shaped deformation part (42) to bend upwards locally, thereby causing the skirt cover (41) to move upwards, and thus opening the inlet of the water outlet channel (15).

8. The sprayer according to any one of claims 1 to 5, characterized in that: A switching valve (5) is also provided above the inlet tube (2). The switching valve (5) includes a valve seat (51), a valve ball (52), and an inverted liquid pumping port (53) formed in the valve seat (51), so that the sprayer can operate in upright mode or inverted mode.

9. The sprayer according to claim 8, characterized in that: The switching valve (5) is constructed on the connecting member (6), which is positioned at the upper end of the inlet pipe (2). The inlet pipe (2) is detachably inserted into the lower part of the connecting member (6). The upper part of the connecting member (6) has a first pipe body (61) and a second pipe body (62) arranged at intervals. At least a portion of the first pipe body (61) constitutes the valve seat (51). The second pipe body (62) is inserted into the water inlet channel (12). The switching valve (5) is configured such that when the sprayer is in the upward upright position, the valve ball (52) closes the inverted liquid pumping port (53) to make the inlet pipe (2), the second pipe body (62), and the water inlet channel (12) fluidly connected; and when the sprayer is in the downward inverted position, the valve ball (52) moves downward to open the inverted liquid pumping port (53) to make the first pipe body (61), the second pipe body (62), and the water inlet channel (12) fluidly connected.

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