Sprayer

Abstract

The utility model relates to a sprayer, which is used for sucking and spraying out liquid in a container, and comprises a main body, a cylinder part, a piston and a wrench, and the main body is provided with a leading-in pipe for leading in the liquid in the container and a nozzle part for spraying out the liquid. The nozzle structure is characterized in that a valve structure is arranged on a channel between the air cylinder part and the nozzle part, and at least a local structure of the valve structure is configured to be capable of closing a flow path between the guide-in pipe and the air cylinder part all the time under pressurization of liquid in the air cylinder part, and the valve structure is closed under the state that the hydraulic pressure in the air cylinder part exceeds the preset pressure of the valve structure. Compared with the prior art, the valve structure has the advantages that the valve structure replaces an existing valve structure of a steel ball seat and a pressure storage valve in a simpler mode, the problems of liquid backflow prevention and liquid leakage prevention are solved at the same time, and the valve structure has two functions.

Description

Technical Field

[0001] The utility model relates to a spray device, in particular to a micro sprayer. Background Art

[0002] A sprayer is a miniature sprayer. This type of product uses a piston to move in a pump body, causing the gas in the pump body to flow and the pressure to decrease, while the pressure outside the pump body remains unchanged. A pressure difference is generated between the inside and outside of the pump body, and the liquid is directed out of the pump body through the pressure difference. When the liquid hits the high-speed airflow, it is instantly atomized. One of the key components for this type of sprayer to achieve a pressure difference between the inside and outside of the pump body is a valve that prevents the stored liquid from flowing back into the container. For example, the "a spray gun" disclosed in Chinese patent ZL201620320123.8 and the "a spray gun body" disclosed in ZL201620317419.6 belong to this type of valve structure of a steel ball seat. This type of spray gun generally has a cylinder portion in the main body, a piston in the cylinder portion, a wrench that controls the movement of the piston, and a wrench that controls the movement of the piston to release liquid from the container. A valve structure for sucking liquid; if the valve structure is only arranged on the passage between the cylinder part and the container, when the spray gun body is installed on the container, the piston part is moved by rotating the wrench, and the liquid in the cylinder is pressurized, so that the liquid in the container is sprayed from the nozzle part through the liquid outlet passage; since the liquid outlet passage is directly connected to the cylinder part, if no valve structure is arranged on this connecting passage, it is easy to cause pollution to the surrounding area due to leakage of liquid; or waste caused by leakage of liquid to the outside has the disadvantage of increasing the cost of liquid.

[0003] Therefore, the Japanese patent application "Pressurized Spray" with application number JP2016126094 and publication number JP2017226474A provides a valve structure mainly composed of a sealing air valve and a base to prevent the stored liquid from flowing back into the container. At the same time, it also provides a pressure storage valve that can recover the liquid between the pressure storage valve and the base into the container. The two valve structures are set to solve the problems of preventing liquid backflow and leakage, but the structures of the two valve structures are relatively complicated, and therefore need further improvement. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide another sprayer which can prevent liquid from flowing back and leaking out in view of the above-mentioned existing technical status.

[0005] The utility model solves the above technical problems by adopting the following technical solution: the sprayer is used to absorb and spray the liquid in the container, and comprises a main body, on which is provided an introduction pipe for introducing the liquid in the container and a nozzle for spraying the liquid, and also comprises:

[0006] A cylinder part, which can be in fluid communication with the introduction pipe and store liquid;

[0007] a piston, which is reciprocatably disposed at the outer end of the cylinder portion and is used to form a closed inner cavity of the cylinder portion; and

[0008] A wrench, provided on one side of the piston, is used to push the piston into the cylinder;

[0009] Features:

[0010] A valve structure is provided on the passage between the cylinder part and the nozzle part, and at least a partial structure of the valve structure is constructed to always close the flow path between the inlet pipe and the cylinder part under the pressure of the liquid in the cylinder part, and when the hydraulic pressure in the cylinder part exceeds the preset pressure of the valve structure, the valve structure is opened to allow the liquid in the cylinder part to be ejected from the nozzle part.

[0011] Further, the valve structure is arranged at the bottom of the cylinder part, including a valve seat which forms a sub-cavity together with the bottom of the cylinder part and a valve piston which can slide along the sub-cavity, and the flow paths on the main body are respectively a first flow path connecting the introduction pipe and the cylinder part, a second flow path connecting the cylinder part and the sub-cavity, and a third flow path connecting the sub-cavity and the nozzle part;

[0012] A gap is formed between at least a partial structure of the valve piston in the valve seat and the inner wall of the sub-cavity, and the liquid flows from the second flow path to the third flow path through the gap by sliding of the valve piston;

[0013] At least a partial structure of the valve piston outside the valve seat is constructed to always close the first flow path under the pressure of the liquid in the cylinder. The design of setting the valve structure at the bottom of the cylinder can, firstly, reduce the length of the cylinder, thereby reducing the force required to pull the wrench, so that even a weak child or an elderly person can easily pull the wrench; secondly, when spraying liquid, the spray liquid flows from the second flow path into the sub-cavity through the gap and then flows to the third flow path, and finally smoothly sprays out from the nozzle; thirdly, the specific design of the valve piston makes its partial structures inside and outside the valve seat respectively act as a valve to prevent the residual liquid from flowing back after spraying and a valve to prevent the stored liquid from flowing back into the container, which is more ingenious and simple in structure.

[0014] In order to enable the liquid in the cylinder to be ejected from the nozzle, further, the valve seat is provided with a first opening connecting the cylinder and the gap, and the valve piston is configured to be elastically pushed to the valve seat and close the first opening. The elastically pushed structure of the valve piston enables it to be better reset in the state conversion between the open valve and the closed valve, and at the same time, it also plays a certain "energy storage" role, so that the liquid is ejected from the nozzle faster and more powerfully.

[0015] In order to realize that the valve piston is constructed to be able to be pushed elastically, from the perspective of simpler assembly and production, preferably, the valve piston includes a piston body for closing the first opening, an elastomer connected to the piston body, and the connection or blockage between the piston body and the first opening is achieved through the elastic deformation of the elastomer, and also includes an outer skirt connected to the end of the elastomer and opening toward the valve seat, with a gap between the outer skirt and the piston body and the elastomer, and the outer skirt abuts against the inner wall of the cylinder part and forms a sealing connection with the valve seat. Since there is a gap between the outer skirt, the piston body and the elastic body, this gap can constitute a space for the spray liquid to flow from the second flow path to the third flow path, and since the outer skirt abuts against the inner wall of the cylinder part and forms a sealing connection with the valve seat, the cylinder part together with the piston can form a closed inner cavity. Therefore, when the pressure in the inner cavity is released, the liquid in the container can push open at least the partial structure of the valve piston outside the valve seat (i.e., the outer skirt), and then enter the cylinder part to refill the liquid, and can close the first flow path after the hydraulic pressure reaches the preset value.

[0016] Furthermore, a first concave cavity is formed in the center of the piston body, and when the liquid flowing into the first opening acts on the first concave cavity, the piston body can be driven to move in the direction of compressing the elastic body, so that the elastic body is deformed and the first opening is opened, and the elastic body is provided with a first flow port connected to the sub-cavity. With the above structure, the piston body can better move back and forth in the sub-cavity to open or close the first opening, and the opening and closing of the first opening can correspond to the deformation of the elastic body. In addition, the first flow port provided on the elastic body enables the piston body to be in fluid communication with the sub-cavity.

[0017] In order to enable the elastic body to obtain a higher compressive elastic force, preferably, the elastic body has a second cavity arranged in the opposite direction to the first cavity, and a second elastic member is arranged in the second cavity. Correspondingly, the main body is provided with an embedding groove along the expansion and contraction direction of the second elastic member, and the elastic body is provided with a first mounting portion, one end of the second elastic member is sleeved on the first mounting portion, and the other end is against the bottom of the embedding groove. The second elastic member can be a leaf spring, a SUS spring, or of course, a full plastic spring integrally formed with the main body by injection molding or the like, thereby reducing the number of components.

[0018] In order to facilitate the assembly between the valve seat and the valve piston, the structure can be implemented as follows: the valve seat is in the shape of a cylinder engaged with the outer skirt, the closed end of the valve seat has a second mounting portion extending toward the cylinder portion, one end of the first elastic member connected to the wrench is connected to the second mounting portion, and the cross-section of the outer skirt is divided into a narrowing section and a straight section along the flow direction of the liquid, the narrowing section exposes the valve seat and can always close the first flow path under the pressure of the liquid in the cylinder portion, while the straight section is directly sealed with the periphery of the valve seat, and a second flow port connected to the first flow port fluid is partially opened on the straight section.

[0019] Furthermore, the skirt corresponding to the narrowing section includes an upper edge directly connected to the straight section, a lower edge partially abutting against the cylinder part, and a connecting section connecting the upper edge and the lower edge. When the cylinder part is filled with liquid, the liquid can exert force to press the connecting section toward the outflow end of the first flow path and close the first flow path. The special "skirt" design of the narrowing section has two functions: one is to form a sealing connection with the periphery of the valve seat and the cylinder part, and the other is to press the connecting section toward the outflow end of the first flow path and close the first flow path under the force exerted by the liquid.

[0020] In order to enable the elastic body to obtain a higher compressive elastic force, preferably, the second elastic member has a higher rigidity than the elastic body, and at the same time plays a certain role in making the liquid "accumulate force" to be ejected from the nozzle with a stronger force.

[0021] In order to realize that the nozzle part can spray, spray water or be closed in the rotating state, preferably, a connecting head is provided on the nozzle part, and when the rotation angle of the connecting head relative to the nozzle part is adjusted, the nozzle part can be in at least one of the following spraying states: spraying or closing, and / or, in the direction of liquid spraying, the nozzle part is provided with a mesh structure downstream of the liquid spraying port that can convert the liquid spraying state into a foam state. The mesh structure can also enable the nozzle part to spray foam.

[0022] Compared with the prior art, the advantages of the utility model are: 1. When the wrench is pressed, the local structure of the valve structure is forced to open; when the wrench is released, the wrench is reset under the reset action of the elastic member, the liquid in the cylinder reaches a fixed amount, and the liquid in the accommodating chamber instantly resists the flow path corresponding to the introduction pipe to prevent the liquid from flowing back toward the container;

[0023] 2. Press the wrench again, and when a certain internal pressure is reached, the valve structure is forced to open the flow path corresponding to the nozzle, and the liquid is ejected through the nozzle under high pressure;

[0024] 3. The valve structure replaces the existing valve structure of the steel ball seat and the pressure storage valve in a simpler way, and solves the problems of preventing liquid backflow and leakage at the same time, having a dual purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the sprayer in the embodiment of the utility model;

[0026] Figure 2 for Figure 1 Explosion diagram of

[0027] Figure 3 This is a structural cross-sectional view of the embodiment of the utility model in which the wrench is pressed, the elastic body is deformed, and finally the liquid is ejected through the nozzle at high pressure;

[0028] Figure 4 for Figure 3 The enlarged schematic diagram of point D in the middle;

[0029] Figure 5 This is a structural cross-sectional view of the embodiment of the utility model in which the wrench has not been pressed, the elastic body has not been deformed, and the cylinder part is full of liquid;

[0030] Figure 6 for Figure 5 The enlarged schematic diagram of point E in the middle;

[0031] Figure 7 It is a structural cross-sectional view of the embodiment of the utility model in which the outer skirt is forced to open when the wrench is pressed;

[0032] Figure 8 for Figure 7 The enlarged structural diagram at F in the middle;

[0033] Fig. 9 This is a structural cross-sectional view of the valve structure in the embodiment of the utility model;

[0034] Fig.10 This is a schematic structural diagram of a valve piston at one angle in an embodiment of the utility model;

[0035] Fig.11 This is a schematic structural diagram of the valve piston at another angle in an embodiment of the utility model;

[0036] Fig.12 It is a structural schematic diagram of the valve seat in the embodiment of the utility model. DETAILED DESCRIPTION

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Example 1

[0039] like Figures 1 to 12 The sprayer of this embodiment is a pressure storage spray device which can prevent liquid from leaking outward and avoid liquid backflow.

[0040] The structure and function of the pressure storage sprayer are further described below.

[0041] Figure 3 A side cross-sectional view of the sprayer.

[0042] The sprayer of the present invention has the following functions: it is installed on a container not shown in the figure, and when the cylinder part B3 is filled with liquid, the piston B4 is moved to the right side in the figure by rotating the wrench B5, and the liquid in the cylinder part B3 is pressurized (at this time, the skirt corresponding to the narrowed section 24 in the valve structure A is closed, and the piston body 21 is opened), so that the liquid is ejected from the nozzle part B2. In order to meet the user's use needs, the nozzle part B2 can be sprayed, sprayed or closed. For this purpose, a connecting head is provided on the nozzle part B2. When the rotation angle of the connecting head relative to the nozzle part B2 is adjusted, the nozzle part B2 can be in at least one of the following spraying states: spraying or closing, or in the liquid spraying direction, the nozzle part B2 is provided with a mesh structure downstream of the spray outlet that can convert the spraying state into a foam state, and the mesh structure can also enable the nozzle part B2 to spray foam.

[0043] In addition, on the contrary, by resetting the wrench B5, the piston B4 moves toward the upstream side (the left side in the figure), causing negative pressure in the cylinder part B3, thereby filling the liquid in the container into the cylinder part B3 (at this time, the skirt corresponding to the narrowing section 24 in the valve structure A is opened, and the piston body 21 is closed).

[0044] Moreover, only one valve structure A is provided on the passage between the cylinder portion B3 and the nozzle portion B2, so as to prevent the liquid from leaking outward and avoid the phenomenon of liquid backflow.

[0045] In terms of structure, the pressure storage sprayer is used to absorb and spray the liquid in the container, and it has: a main body B, an introduction pipe B1, and a cover. Among them, the main body B has: a nozzle part B2, a cylinder part B3, a piston B4, a wrench B5, a first elastic member B8 for resetting, and a valve structure A. Specifically, the main body B is provided with an introduction pipe B1 for introducing the liquid in the container and a nozzle part B2 for spraying the liquid, and also includes a cylinder part B3 that can be fluidically connected with the introduction pipe B1 and store the liquid, a piston B4 that can be reciprocated and arranged at the outer end of the cylinder part B3 and is used to form a closed inner cavity of the cylinder part B3, and a wrench B5 arranged on one side of the piston B4, the wrench B5 is used to push the piston B4 into the cylinder part B3, and the first elastic member B8 is connected to the wrench B5 to play a resetting role. In addition, the sprayer also has a cover body C covering the cylinder part B3 and the main body B.

[0046] Next, the valve structure A constituting the pressure storage type sprayer will be mainly described.

[0047] refer to Figures 3 to 7The valve structure A is arranged on the channel between the cylinder part B3 and the nozzle part B2. A simpler way of this embodiment is to directly arrange it at the bottom of the cylinder part B3. At least a partial structure of the valve structure A is constructed to always close the flow path between the inlet pipe B1 and the cylinder part B3 under the pressure of the liquid in the cylinder part B3, and when the hydraulic pressure in the cylinder part B3 exceeds the preset pressure of the valve structure A, the valve structure A is opened to make the liquid in the cylinder part B3 spray out from the nozzle part B2. Its specific structure is as follows: it includes a valve seat 1 which together with the bottom of the cylinder part B3 forms a sub-cavity 3 and a valve piston 2 which can slide along the sub-cavity 3, and the flow paths on the main body B are respectively a first flow path a connecting the inlet pipe B1 and the cylinder part B3, a second flow path b connecting the cylinder part B3 and the sub-cavity 3, and a third flow path c connecting the sub-cavity 3 and the nozzle part B2. A gap S is generated between at least a partial structure of the valve piston 2 in the valve seat 1 and the inner wall of the sub-cavity 3. By sliding of the valve piston 2, the liquid flows from the second flow path b to the third flow path c through the gap S; and at least a partial structure of the valve piston 2 outside the valve seat 1 is constructed to always close the first flow path a under the pressure of the liquid in the cylinder part B3. The design of setting the valve structure A at the bottom of the cylinder part B3 can reduce the length of the cylinder part B3, thereby reducing the force required to pull the wrench B5, and even a weak child or an elderly person can easily pull the wrench B5; even if liquid leakage occurs, the sub-chamber 3 can "store" the excess liquid after each spraying, and flow from the second flow path b to the third flow path c along with the next spraying, and finally smoothly spray out from the nozzle part B2. In addition, the valve seat 1 is provided with a first opening 10 connecting the cylinder part B3 and the gap S, and the valve piston 2 is configured to be elastically pushed to the valve seat 1 and close the first opening 10. The elastically pushed structure of the valve piston 2 enables it to be better reset in the state conversion between the open valve and the closed valve, and at the same time, it also plays a certain "energy storage" role, so that the liquid is sprayed out from the nozzle part B2 faster and more powerfully.

[0048] In order to realize that the valve piston 2 is constructed to be able to be pushed elastically, from the perspective of simpler assembly and production, the valve piston 2 of this embodiment includes a piston body 21 for closing the first opening 10, and an elastomer 22 connected to the piston body 21, and the connection or blockage between the piston body 21 and the first opening 10 is achieved through the elastic deformation of the elastomer 22. It also includes an outer skirt 23 connected to the end of the elastomer 22 and opening toward the valve seat 1, and a gap 240 is left between the outer skirt 23 and the piston body 21 and the elastomer 22, and the outer skirt 23 abuts against the inner wall of the cylinder part B3 and forms a sealing connection with the valve seat 1. Since there is a gap 240 between the outer skirt 23 and the piston body 21 and the elastic body 22, this gap 240 can constitute a space for "storing" excess liquid after the spraying is completed, and since the outer skirt 23 abuts against the inner wall of the cylinder part B3 and forms a sealing connection with the valve seat 1, the cylinder part B3 can form a closed inner cavity together with the piston B4. Therefore, when the pressure in the inner cavity is released, the liquid in the container can push open at least the partial structure of the valve piston 2 outside the valve seat 1 (that is, the outer skirt 23), and then enter the cylinder part B3 to be refilled, and the first flow path a can be closed after the hydraulic pressure reaches the preset value. In order to better enable the piston body 21 to move back and forth in the sub-cavity 3 to open or close the first opening 10, in addition, a first concave cavity 211 is formed in the center of the piston body 21. When the liquid flowing into the first opening 10 acts on the first concave cavity 211, the piston body 21 can be driven to move in the direction of compressing the elastic body 22, so that the elastic body 22 is deformed to open the first opening 10, and a first flow port 221 connected to the sub-cavity 3 is provided on the elastic body 22. In this way, the piston body 21 can be connected to the fluid of the sub-cavity 3. When spraying liquid, the spray liquid flows from the second flow path b into the sub-cavity 3 through the gap and then flows to the third flow path c, and finally smoothly sprays out from the nozzle part B2. In addition to opening the first opening 10 by means of the deformation of the elastic body 22 itself, the elastic body 22 of this embodiment has a second cavity 222 arranged in the opposite direction to the first cavity 211, and a second elastic member 26 is arranged in the second cavity 222, so that the elastic body 22 can obtain a higher compressive elastic force. The second elastic member 26 is selected as a SUS spring with higher rigidity than the elastic body 22, so that the elastic body 22 can obtain a higher compressive elastic force, thereby playing a certain role in making the liquid "accumulate force" to spray out the nozzle part B2 with a stronger force. Correspondingly, the main body B is provided with an embedding groove B7 along the expansion and contraction direction of the second elastic member 26, and the elastic body 22 is provided with a first mounting portion 220, and one end of the second elastic member 26 is sleeved on the first mounting portion 220, and the other end is against the bottom of the embedding groove B7.

[0049] Finally, the assembly between the valve seat 1 and the valve piston 2 is realized from a structural point of view. The valve seat 1 is in the shape of a cylinder connected to the outer skirt 23. The closed end 11 of the valve seat 1 has a second mounting portion 12 extending toward the cylinder portion B3. One end of the first elastic member B8 connected to the wrench B5 is connected to the second mounting portion 12. The cross-section of the outer skirt 23 is divided into a narrowing section 24 and a straight section 25 along the flow direction of the liquid. The narrowing section 24 exposes the valve seat 1 and can always close the first flow path a under the pressure of the liquid in the cylinder portion B3, while the straight section 25 is directly sealed with the periphery of the valve seat 1, and a second flow port 251 connected to the first flow port 221 is partially opened on the straight section 25. To achieve that at least a partial structure of the valve structure A can prevent the liquid from flowing back toward the container when the liquid instantaneously presses against the flow path corresponding to the inlet pipe B1, the at least partial structure corresponds to the outer skirt 23. The key point of the design structure of the outer skirt 23 is that the skirt corresponding to the narrowing section 24 includes an upper edge 241 directly connected to the straight section 25, a lower edge 242 abutting against a part of the cylinder part B3, and a connecting section 243 connecting the upper edge 241 and the lower edge 242. When the cylinder part B3 is filled with liquid, the liquid can exert a force to press the connecting section 243 toward the outflow end of the first flow path a and close the first flow path a. The special "skirt" design of the narrowing section 24 has two functions. One is to form a sealed connection with the periphery of the valve seat 1 and the cylinder part B3, and the other is to press the connecting section 243 toward the outflow end of the first flow path a and close the first flow path a under the action of the force exerted by the liquid.

[0050] In summary, the spraying process of the sprayer is as follows: first, the user can turn on the nozzle part B2 with a mesh structure according to whether to generate foam, and then select the indicator icon corresponding to the connector on the nozzle part B2 to spray or close according to the use requirements. After adjusting the rotation angle of the connector, when the wrench B5 is pressed to apply liquid, the connecting section 243 of the outer skirt 23 of the valve structure A is forced to open, thereby opening the outflow end of the first flow path a (such as Figure 7 , 8 As shown in FIG. 1 , the reduced pressure generated in the cylinder B3 is used as a driving force to drive the liquid from the fluid-connected container into the cylinder B3 to a certain amount, and the liquid in the cylinder B3 instantly presses against the outflow end of the first flow path a, which can effectively seal the outflow end of the first flow path a and prevent the liquid from flowing back toward the container;

[0051] Press the wrench B5 again. Due to the incompressibility of the liquid, the user can force the piston B4 of the valve structure A to move to the downstream side (right side in the figure) when pressing the wrench B5. When the liquid flowing into the first opening 10 acts on the first concave cavity 211 of the piston B4, the piston body 21 can be driven to move in the direction of compressing the elastic body 22, so that the elastic body 22 is deformed and the first opening 10 is opened, so that the second elastic member 26 in the second concave cavity 222 of the elastic body 22 is also compressed to store energy. The liquid passes through the first opening 10, the piston body 21, and the gap between the elastic body 22 and the inner wall of the sub-cavity 3. With the sliding of the piston body 21, the liquid flows from the second flow path b to the third flow path c through the gap, and the potential energy accumulated by the second elastic member 26 is used to make the liquid flow out of the spray port of the nozzle part B2 more forcefully. The liquid in the cylinder part B3 instantly supports the flow path corresponding to the inlet pipe B1 to prevent the liquid from flowing back to the container (such as Figure 3 , 4 As shown), at this time, the outside air is connected to the container through the air filling hole to achieve air pressure balance; and when the pressing of the wrench B5 stops, the wrench B5 is reset under the reset action of the first elastic member B8, and the piston body 21 can return to its original position under the action of the elastic body 22 and the second elastic member 26, closing the first opening 10, thereby refilling the liquid in the container into the cylinder part B3 (at this time, the skirt corresponding to the narrowed section 24 in the valve structure A is opened).

[0052] Example 2

[0053] The structure is basically the same as that of embodiment 1, with the only difference being that the second elastic member 26 is a leaf spring, and of course it can also be a full-plastic spring integrally formed with the main body by injection molding or the like, thereby reducing the number of components.

Claims

1. A sprayer for sucking and spraying liquid in a container, comprising a main body (B), the main body (B) being provided with an introduction pipe (B1) for introducing the liquid in the container and a nozzle part (B2) for spraying the liquid, and further comprising: A cylinder part (B3) capable of being in fluid communication with the introduction pipe (B1) and storing liquid; a piston (B4) which is reciprocatably disposed at the outer end of the cylinder portion (B3) and is used to form a sealed inner cavity of the cylinder portion (B3); and A wrench (B5) is provided on one side of the piston (B4) and is used to push the piston (B4) into the cylinder part (B3); Features: A valve structure (A) is provided on the passage between the cylinder portion (B3) and the nozzle portion (B2), and at least a partial structure of the valve structure (A) is constructed so as to always close the flow path between the inlet pipe (B1) and the cylinder portion (B3) under the pressure of the liquid in the cylinder portion (B3), and when the hydraulic pressure in the cylinder portion (B3) exceeds the preset pressure of the valve structure (A), the valve structure (A) is opened to allow the liquid in the cylinder portion (B3) to be ejected from the nozzle portion (B2).

2. The sprayer according to claim 1, characterized in that: The valve structure (A) is arranged at the bottom of the cylinder part (B3), and comprises a valve seat (1) which together with the bottom of the cylinder part (B3) encloses a sub-cavity (3) and a valve piston (2) which can slide along the sub-cavity (3), and the flow paths on the main body (B) are respectively a first flow path (a) connecting the introduction pipe (B1) and the cylinder part (B3), a second flow path (b) connecting the cylinder part (B3) and the sub-cavity (3), and a third flow path (c) connecting the sub-cavity and the nozzle part (B2); A gap is generated between at least a partial structure of the valve piston (2) in the valve seat (1) and the inner wall of the sub-cavity (3), and liquid flows from the second flow path (b) to the third flow path (c) through the gap due to the sliding of the valve piston (2); At least a partial structure of the valve piston (2) outside the valve seat (1) is constructed so as to always close the first flow path (a) under the pressure of the liquid in the cylinder portion (B3).

3. The sprayer according to claim 2, characterized in that: The valve seat (1) is provided with a first opening (10) connecting the cylinder portion (B3) and the gap, and the valve piston (2) is configured to be elastically pushed to the valve seat (1) and close the first opening (10).

4. The sprayer according to claim 3, characterized in that: The valve piston (2) includes a piston body (21) for closing the first opening (10), an elastic body (22) connected to the piston body (21), and the connection or blockage between the piston body (21) and the first opening (10) is achieved through the elastic deformation of the elastic body (22). It also includes an outer skirt (23) connected to the end of the elastomer (22) and opening toward the valve seat (1), and a gap (240) is left between the outer skirt (23) and the piston body (21) and the elastomer (22), and the outer skirt (23) abuts against the inner wall of the cylinder part (B3) and forms a sealing connection with the valve seat (1).

5. The sprayer according to claim 4, characterized in that: A first concave cavity (211) is formed in the center of the piston body (21). When the liquid flowing into the first opening (10) acts on the first concave cavity (211), the piston body (21) can be driven to move in a direction of compressing the elastic body (22), so that the elastic body (22) is deformed to open the first opening (10), and a first flow port (221) connected to the sub-cavity (3) is provided on the elastic body (22).

6. The sprayer according to claim 5, characterized in that: The elastic body (22) has a second cavity (222) which is arranged in the opposite direction to the first cavity (211), and a second elastic member (26) is arranged in the second cavity (222). Correspondingly, the main body (B) has an embedding groove (B7) along the expansion and contraction direction of the second elastic member (26). The elastic body (22) is provided with a first mounting portion (220), and one end of the second elastic member (26) is sleeved on the first mounting portion (220), and the other end is against the bottom of the embedding groove (B7).

7. The sprayer according to claim 6, characterized in that: The valve seat (1) is in the shape of a cylinder connected to the outer skirt (23); the closed end (11) of the valve seat (1) has a second mounting portion (12) extending toward the cylinder portion (B3); one end of a first elastic member (B8) connected to the wrench (B5) is connected to the second mounting portion (12); and the cross section of the outer skirt (23) is divided into a narrowing section (24) and a straight section (25) along the flow direction of the liquid; the narrowing section (24) exposes the valve seat (1) and can always close the first flow path (a) under the pressure of the liquid in the cylinder portion (B3); and the straight section (25) is directly sealed with the periphery of the valve seat (1), and a second flow port (251) connected to the first flow port (221) is partially opened on the straight section (25).

8. The sprayer according to claim 7, characterized in that: The skirt corresponding to the narrowed section (24) includes an upper edge (241) directly connected to the straight section (25), a lower edge (242) partially abutting against the cylinder portion (B3), and a connecting section (243) connecting the upper edge (241) and the lower edge (242); when the cylinder portion (B3) is filled with liquid, the liquid can exert force to press the connecting section (243) toward the outflow end of the first flow path (a) and close the first flow path (a).

9. The sprayer according to claim 8, characterized in that: The second elastic member (26) has higher rigidity than the elastic body (22).

10. The sprayer according to any one of claims 1 to 8, characterized in that: The nozzle part (B2) is provided with a connecting head. When the rotation angle of the connecting head relative to the nozzle part (B2) is adjusted, the nozzle part (B2) can be in at least one of the following liquid spraying states: spraying or closed. In the liquid spraying direction, the nozzle part (B2) is provided with a mesh structure downstream of the liquid spraying port that can convert the liquid spraying state into a foam state.

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