Piston integrated sprayer

Abstract

The invention relates to the technical field of spray pumps, in particular to a piston integrated sprayer which comprises a spray head, a connecting cover used for being connected with a spray bottle and a spray pump assembly arranged on the connecting cover and used for being matched with the spray head. The atomizing pump assembly comprises a pump shell fixed to the connecting cover in a clamped mode, a deformation piston installed on the pump shell and a connecting piston installed on the pump shell and used for being matched with the deformation piston, and the connecting piston is fixed to the lower portion of the spray head in a clamped mode. The deformation piston is provided with a piston head, a piston rod part and a deformation part which are integrally connected. The piston assembly has the effect that the problem that assembly of the piston assembly is tedious is solved.

Description

Technical Field

[0001] The present application relates to the technical field of spray pumps, and in particular to a sprayer with an integrated piston. Background Art

[0002] In the sprayer, the spray pump is the core component that connects the various components. It can work closely with the piston assembly to complete the spray function. The user can directly or indirectly push the piston assembly downward by pressing the top of the nozzle or the pump body to start the spray process.

[0003] In the related art, the piston assembly usually includes a piston head, a piston rod and a piston spring. The piston spring is located between the piston head and the fixed structure inside the pump body. When the piston head moves downward under the action of pressure, the spring is compressed; when the pressure disappears, the spring returns to its original state and pushes the piston head upward. The elastic restoring force of the spring can make the piston head return to its original position, thereby realizing the reciprocating process of sucking and discharging liquid.

[0004] In view of the above-mentioned related technologies, during the assembly process of the sprayer, it is necessary to assemble the multiple components of the piston assembly with the pump body in sequence. First, the slot on the piston rod needs to be aligned with the corresponding protrusion on the piston head to prevent the connection from being loose and affecting the performance of the entire piston assembly. The installation of the spring requires the use of a tool to compress it and then install it into a specific position inside the pump body. It is also necessary to ensure that it always maintains the correct position and elastic direction during operation, ensure that the spring is properly installed, and ensure the movement performance of the piston, so that the sprayer can work normally. The overall assembly process is relatively cumbersome, so it is necessary to provide a piston assembly that is easy to assemble with the pump body. Summary of the invention

[0005] In order to improve the problem of complicated assembly of the piston assembly, the present application provides a sprayer with an integrated piston.

[0006] The piston-integrated sprayer provided in the present application adopts the following technical solution: A piston-integrated sprayer comprises a spray head, a connection cover for connecting with a spray bottle, and a spray pump assembly provided on the connection cover and used to cooperate with the spray head, wherein the spray pump assembly comprises a pump housing fixedly connected to the connection cover, a deformable piston mounted on the pump housing, and a connection piston mounted on the pump housing and used to cooperate with the deformable piston, wherein the connection piston is fixedly connected to the bottom of the spray head; The deformable piston comprises a piston head, a piston rod and a deformable portion which are integrally connected.

[0007] By adopting the above technical solution, the piston head, piston rod and deformation part are integrated to reduce the number and complexity of assembly parts. Compared with the traditional piston assembly, there is no need to accurately align the piston rod with the piston head slot protrusion, avoiding performance problems caused by loose connection, making the assembly process simpler and faster. The integrated structure makes the movement of the piston assembly in the pump body more coordinated and smooth, reducing energy loss and performance fluctuations caused by loose connection or uneven friction between components. During the spraying process, it can stabilize the liquid absorption and discharge, making the spray pressure more uniform and the spray effect more stable and delicate.

[0008] Furthermore, the piston head is installed in the connecting piston, the piston rod portion is coaxially arranged and integrally connected to the center axis position of the piston head, the deformation portion is integrally connected to the lower side of the piston head, and a fitting gap is left between the outer wall of the piston rod portion and the inner wall of the piston head for matching with the pump housing.

[0009] By adopting the above technical solution, the piston head is installed in the connecting piston, and the nested setting allows the piston head to be more accurately guided during the movement. During the frequent liquid suction and discharge process of the sprayer, the piston head will not shake or deviate. Due to the precise movement of the piston head in the connecting piston and the setting of the matching clearance, the liquid can be more accurately sucked into the pump housing during the liquid suction process of the sprayer.

[0010] Furthermore, the pump casing comprises an inner casing, a bottom ring plate and an outer casing, the inner casing is coaxially arranged inside the outer casing, the bottom ring plate is integrally connected to the outer casing and the lower side of the inner casing, a deformation gap is reserved between the inner casing and the outer casing for the deformation part to be inserted and deformed, the outer casing is clamped and fixed to the connecting cover, and the upper side of the inner casing is inserted into the fitting gap.

[0011] By adopting the above technical solution, the pump housing is composed of an inner housing, a bottom ring plate and an outer housing. The multi-layer structure makes the pump housing itself have better structural strength and stability. The inner housing is coaxially arranged inside the outer housing. The two cooperate with each other to jointly bear the various forces generated during the operation of the sprayer, such as the pressure during the movement of the piston, the impact force generated by the flow of liquid, etc., effectively preventing the pump housing from being deformed or damaged. The deformation gap left between the inner housing and the outer housing provides a space for the deformation part to be inserted and deformed. When the sprayer is working and the piston moves, the deformation part can be reasonably deformed in the deformation gap according to the setting requirements, so as to adapt to the pressure changes and liquid flow conditions during the movement of the piston.

[0012] Furthermore, the piston rod portion has an inner rod and an outer sleeve, a gap is left between the inner rod and the outer sleeve for fluid to pass through, and connecting ribs are integrally connected between the inner rod and the outer sleeve. The connecting ribs are arranged along the length direction of the inner rod and multiple connecting ribs are provided along the circumference of the outer wall of the inner rod.

[0013] By adopting the above technical solution, a gap is left between the inner rod and the outer sleeve for the fluid to pass through, providing a channel for the flow of liquid inside the piston assembly. Since the liquid can flow more freely in the gap, the situation of excessive local pressure or poor liquid flow caused by the obstruction of the piston rod is avoided, which helps to achieve a more stable spray flow rate and pressure. A plurality of connecting ribs are integrally connected between the inner rod and the outer sleeve, and each connecting rib is arranged along the length direction of the inner rod and distributed circumferentially along the outer wall of the inner rod. The connecting ribs tightly connect the inner rod and the outer sleeve, thereby enhancing the overall structural strength of the piston rod. During the operation of the sprayer, when the piston is subjected to greater pressure, the connecting ribs can effectively share the pressure and prevent deformation or separation between the inner rod and the outer sleeve.

[0014] Furthermore, the deformation portion is continuously provided with a plurality of corrugated sections along the length direction for guiding deformation.

[0015] By adopting the above technical solution, the corrugated segment enables the deformation part to deform according to a predetermined pattern when subjected to pressure. Each corrugated segment has a specific bending shape and elastic properties. When the piston movement produces pressure changes, the corrugated segment stretches or compresses in an orderly manner, thereby controlling the overall deformation degree and direction of the deformation part. The continuous arrangement and elastic deformation characteristics of the corrugated segment help to disperse stress. During the frequent suction and discharge cycles of the sprayer, the piston assembly will be subjected to repeated pressure changes and mechanical stress. The corrugated segment distributes the stress evenly throughout the deformation part through its own deformation, avoiding stress concentration at a certain point or area, thereby reducing the risk of component damage due to long-term fatigue.

[0016] Furthermore, it also includes a filter assembly for filtering gas, the outer shell is provided with a mounting ring portion on the upper side for mounting the filter assembly, the filter assembly is sleeved on the outside of the connecting piston and is fixedly engaged with the mounting ring portion; The filter assembly comprises a filter element, a filter element seat for fixing the filter element, and a pressure cover for abutting against the top side of the filter element.

[0017] By adopting the above technical solution, during the use of the sprayer, the outside air will enter the pump casing to participate in the work, and the filter assembly can filter the incoming gas. The filter element, as the core filtering component, can intercept dust, particles and other impurities in the air to prevent impurities from entering the sprayer with the gas. The filter assembly is fixed by clamping with the mounting ring on the upper side of the outer shell and sleeved on the outside of the connecting piston. The filter element seat plays a stable supporting role for the filter element, ensuring that the filter element is fixed in position during operation and will not shift to affect the filtering effect. The pressure cover presses against the top side of the filter element to further prevent the filter element from loosening. At the same time, it also helps to enhance the sealing of the entire filter assembly, so that the gas can only enter after being filtered by the filter element, ensuring the reliability of the filtration.

[0018] Further, the filter element seat includes a first ring portion for clamping and fixing with the mounting ring portion and a second ring portion for mounting the filter element, the inner diameter of the second ring portion is larger than the inner diameter of the first ring portion, the second ring portion is integrally connected to the outer wall of the first ring portion near the top side, and the second ring portion is provided with an accommodating ring groove for clamping the filter element on the inner wall near the top side of the first ring portion; The first ring portion is integrally connected with a clamping ridge on the outer wall close to the bottom side, and the mounting ring portion is provided with a ring groove in the circumferential direction of the inner wall for the clamping ridge to be clamped.

[0019] By adopting the above technical solution, the snap-fitting ridges integrally connected to the outer wall of the first ring portion cooperate with the annular grooves circumferentially provided on the inner wall of the mounting ring portion, so as to realize the precise snap-fitting and fixing of the filter element seat and the mounting ring portion on the outer shell. When assembling the sprayer, the operator only needs to align the snap-fitting ridges with the annular grooves and gently push them in to quickly complete the installation of the filter assembly. The second ring portion is integrally connected to the outer wall of the first ring portion near the top side, and the integrated structural setting avoids problems such as loose connection and easy occurrence of gaps. The inner diameter of the second ring portion is larger than the inner diameter of the first ring portion, and a receiving annular groove is provided on the inner wall of the second ring portion near the top side of the first ring portion, which is compatible with the shape and installation requirements of the filter element, so that the filter element can be easily inserted into the receiving annular groove and fixed in the second ring portion.

[0020] Furthermore, the inner wall of the second ring portion is provided with a guiding slope surface at an upper position of the accommodating ring groove for guiding the filter element to be inserted.

[0021] By adopting the above technical solution, the guide slope provides a transition guide structure for the filter element to be inserted into the receiving ring groove. When installing the filter element, the operator can push the filter element into the receiving ring groove along the guide slope, thereby reducing the difficulty of the installation operation, preventing the edge of the filter element from being broken or deformed, and effectively protecting the integrity of the filter element.

[0022] Furthermore, the pressure cover has a pressing ring portion and a limiting ring portion which is vertically arranged and integrally connected to the top side of the pressing ring portion, the pressing ring portion is inserted between the inner wall of the second ring portion and the outer wall of the connecting piston and is pressed against the top side of the filter element, the outer wall of the abutting ring portion is integrally connected with a fixing ridge for snapping into the accommodating ring groove, and the bottom side of the limiting ring portion abuts against the top side of the second ring portion.

[0023] By adopting the above technical solution, the bottom side of the limiting ring part abuts against the top side of the second ring part, and the pressing ring part is inserted into the receiving ring groove through the fixed convex ridge, so as to limit the gland in multiple directions. The abutment effect fixes the position of the gland in the vertical direction to prevent it from moving up and down, and the engagement of the fixed convex ridge and the receiving ring groove limits the displacement of the gland in the horizontal direction. As a result, the gland can more reliably press and fix the filter element, and improve the stability of the filter element fixing structure.

[0024] Furthermore, the connection cover has an installation cavity for inserting the pump casing at the position of the central axis, and the connection cover is provided with a convex step for clamping the pump casing at the position of the installation cavity.

[0025] By adopting the above technical solution, the installation cavity provided in the connection cover at the center axis position provides installation space for the pump housing, so that the pump housing can be accurately inserted into the corresponding position during assembly. The convex step clamps the pump housing to prevent the pump housing from loosening, shifting or even falling off, ensuring that the pump housing is always stably installed in the connection cover and maintaining a close fit between the various components inside the sprayer.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By integrating the piston head, piston rod and deformation part, the number and complexity of assembly parts are reduced, and the problems such as the need for precise alignment in traditional piston assemblies are avoided, making assembly easier and faster. The connection cover is provided with an installation cavity and a convex step to clamp the pump housing, and the filter assembly components are connected by means of snap-fit, which enhances the stability of the connection between the components, facilitates assembly and ensures that the components are not easy to loosen or shift during the use of the sprayer, which improves the assembly efficiency and stability as a whole; 2. In the piston assembly, the integrated structure and the reasonable gaps, connecting ribs, corrugated sections and other settings of each part make the piston move more coordinated and smooth in the pump body, reduce energy loss and performance fluctuations, achieve stable liquid suction and discharge, make the spray pressure uniform, and the spray effect delicate. The multi-layer structure of the pump housing improves its own strength and stability, can better cope with various forces during work, and ensure the stable operation of the sprayer. The coordinated optimization between these components ultimately improves the spray quality of the sprayer and meets the requirements for spray effects in different scenarios; 3. The filter assembly is closely matched with the filter element, filter element seat, gland, etc. to effectively filter the gas entering the pump housing to participate in the work, intercept dust, particles and other impurities in the air, and prevent them from entering the sprayer to affect the spray quality or damage the internal components. The structural settings of each part of the filter assembly are convenient for installation and replacement of the filter element and ensure the stability of its own structure, ensuring the reliability and continuity of filtration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the explosion structure of the piston-integrated sprayer according to an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the explosion structure of the spray pump according to the embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the nozzle, connecting cover and spray pump of the embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of the spray pump according to the embodiment of the present application.

[0031] Figure 5 It is a schematic diagram of the structural explosion of the filter assembly of the embodiment of the present application.

[0032] Description of reference numerals: 1, spray bottle; 2, spray head; 3, spray pump assembly; 31, pump housing; 311, inner housing; 312, bottom ring plate; 313, outer housing; 3131, mounting ring; 3132, ring groove; 314, deformation gap; 32, deformation piston; 321, piston head; 3211, fitting gap; 322, piston rod; 3221, inner rod; 3222, outer sleeve; 3223, connecting rib; 3 23. Deformation portion; 33. Connecting piston; 34. Filter assembly; 341. Filter element; 342. Filter element seat; 3421. First ring portion; 34211. Snap-fit ​​ridge; 3422. Second ring portion; 34221. Accommodating ring groove; 34222. Guide slope; 343. Pressure cover; 3431. Pressing ring portion; 34311. Fixing ridge; 3432. Limiting ring portion; 4. Connecting cover; 41. Convex step; 5. Outer cover. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-5 And embodiments, the present application is further described in detail.

[0034] The present application embodiment discloses a sprayer with an integrated piston. Figure 1The piston-integrated sprayer includes a spray bottle 1, a spray head 2, a spray pump assembly 3 connected to the spray head 2, a connecting cover 4 for installing the spray pump assembly 3 and connecting with the spray bottle 1, and an outer cover 5 for protecting the spray head 2.

[0035] The connecting cover 4 is threadedly connected to the spray bottle 1. The connecting cover 4 has an installation cavity for inserting the spray pump assembly 3 at the central axis position. The connecting cover 4 is provided with a convex step 41 for clamping and fixing the spray pump assembly 3 at the installation cavity position. The spray pump assembly 3 is installed below the spray head 2. The outer cover 5 covers and clamps on the connecting cover 4 and covers the outside of the spray head 2.

[0036] Reference Figure 2 and Figure 3 The spray pump assembly 3 includes a pump housing 31 fixed in the connecting cover 4, a deformable piston 32 installed in the pump housing 31, a connecting piston 33 installed in the pump housing 31 and used to cooperate with the deformable piston 32, and a filter assembly 34 installed in the pump housing 31 and used to filter gas.

[0037] The pump housing 31 comprises an inner housing 311, a bottom ring plate 312 and an outer housing 313 which are coaxially arranged and integrally connected. The outer diameter of the outer housing 313 is larger than the outer diameter of the inner housing 311 and is sleeved on the outside of the inner housing 311. The bottom ring plate 312 is integrally connected between the outer housing 313 and the inner housing 311 and is located at the lower position. A deformation gap 314 is reserved between the inner housing 311 and the outer housing 313 for the deformation piston 32 to be inserted and deformed. The outer housing 313 is clamped and fixed to the connecting cover 4.

[0038] Combination Figure 4 The connecting piston 33 is arranged in a cylindrical shape, and the connecting piston 33 is clamped and fixed at the bottom of the spray head 2 and is used to cooperate with the deforming piston 32. The deforming piston 32 has a coaxially arranged piston head 321, a piston rod 322 and a deforming part 323. The piston head 321 is inserted into the connecting piston 33, the piston rod 322 is integrally connected to the center axis position of the piston head 321, and the deforming part 323 is integrally connected to the lower side of the piston head 321. A matching gap 3211 is reserved between the outer wall of the piston rod 322 and the inner wall of the piston head 321 for inserting the upper side of the inner shell 311.

[0039] The piston rod portion 322 has an inner rod 3221, an outer sleeve 3222 and a connecting rib 3223 which are coaxially arranged. A gap is left between the inner rod 3221 and the outer sleeve 3222 for fluid to pass through, and the connecting rib 3223 is integrally connected between the inner rod 3221 and the outer sleeve 3222. In this embodiment, the number of the connecting ribs 3223 is two, and the two connecting ribs 3223 are arranged along the length direction of the inner rod 3221 and symmetrically arranged on opposite sides of the outer wall of the inner rod 3221. The deformation portion 323 is continuously arranged with a plurality of corrugated sections for guiding deformation along the length direction. In this embodiment, the material of the deformation portion 323 is preferably rubber with a certain deformation ability. When the deformation portion 323 is demoulded outside the tubular mold, a gasification method can be used to generate a gap between the position of the corrugated section and the mold, which is convenient for demoulding, thereby ensuring the structural integrity of the deformation portion 323, especially the corrugated section.

[0040] Reference Figure 4 and Figure 5 The filter assembly 34 is sleeved on the outside of the connecting piston 33 and is fixedly connected to the outer shell 313 of the pump shell 31. In this embodiment, the filter assembly 34 includes a filter element 341, a filter element seat 342 and a gland 343. The outer shell 313 is coaxially arranged at the upper end and integrally connected with a mounting ring 3131. The mounting ring 3131 is provided with a ring groove 3132 in the circumferential direction of the inner wall for the filter element seat 342 to be inserted.

[0041] The filter element seat 342 includes a first ring portion 3421 and a second ring portion 3422 which are coaxially arranged and integrally connected. The first ring portion 3421 is used to be clamped and fixed with the mounting ring portion 3131, and the second ring portion 3422 is used to install the filter element 341. The inner diameter of the second ring portion 3422 is larger than the inner diameter of the first ring portion 3421, and the second ring portion 3422 is integrally connected to the outer wall of the first ring portion 3421 near the top side. The first ring portion 3421 is integrally connected with a clamping rib 34211 on the outer wall near the bottom side, and the clamping rib 34211 can be clamped into the annular groove 3132 on the inner wall of the mounting ring portion 3131. The second ring portion 3422 is provided with an accommodating annular groove 34221 for the filter element 341 to be clamped into on the inner wall near the top side of the first ring portion 3421. The inner wall of the second ring portion 3422 is provided with a guiding slope 34222 at an upper position of the accommodating ring groove 34221 for guiding the filter element 341 to be inserted.

[0042] The pressure cover 343 has a pressing ring portion 3431 and a limiting ring portion 3432 which is vertically arranged and integrally connected to the top side of the pressing ring portion 3431. The pressing ring portion 3431 is inserted between the inner wall of the second ring portion 3422 and the outer wall of the connecting piston 33 and is pressed against the top side of the filter element 341. The outer wall of the pressing ring portion 3431 is integrally connected with a fixing ridge 34311 for snapping into the accommodating ring groove 34221, and the bottom side of the limiting ring portion 3432 is in contact with the top side of the second ring portion 3422.

[0043] The implementation principle of the piston-integrated sprayer of the embodiment of the present application is as follows: the pump housing 31 of the spray pump assembly 3 is inserted through the installation cavity at the central axis position of the connecting cover 4, and is fixed by the convex step 41 in the installation cavity, so that the pump housing 31 can be accurately positioned and will not be easily loosened or shifted during use. In the spray pump assembly 3, the deformable piston 32, the connecting piston 33, and the filter assembly 34 are all installed in the pump housing 31 or in cooperation with the pump housing 31, thereby forming a complete spray power and filtering unit, which cooperates with the connecting cover 4 and the spray bottle 1 to form the overall structure of the sprayer.

[0044] When the user presses the spray head 2, the external force is transmitted to the connecting piston 33 through the spray head 2. The connecting piston 33 acts on the deformable piston 32, and the piston rod 322 and the piston head 321 of the deformable piston 32 move up and down in the connecting piston 33. A gap is left between the inner rod 3221 of the piston rod 322 and the outer sleeve 3222 for the fluid to pass through, which avoids the local excessive pressure or liquid flow obstruction caused by the solid structure of the piston rod, and helps to maintain a stable spray flow rate and pressure. The two symmetrically arranged connecting ribs 3223 enhance the overall structural strength of the piston rod 322, so that it can withstand the greater pressure generated by the piston movement and prevent deformation or separation between the inner rod 3221 and the outer sleeve 3222.

[0045] When the piston movement causes pressure changes, the corrugated section of the deformation part 323 will stretch or compress in an orderly manner according to a predetermined pattern based on its own specific bending shape and elastic characteristics, accurately controlling the overall deformation degree and direction of the deformation part 323. During the frequent liquid suction and discharge cycles of the sprayer, the corrugated section can evenly disperse the repeated pressure changes and mechanical stresses borne by the piston assembly throughout the deformation part 323, avoiding stress concentration, reducing the risk of component damage due to long-term fatigue, and ensuring the structural integrity of the deformation part 323 and the stability of the piston movement.

[0046] When the sprayer is working, the outside air will participate in the spraying process, and the air will first reach the filter element 341, so that impurities such as dust and particles in the air can be effectively intercepted.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A piston-integrated sprayer, characterized in that: The spray pump assembly (3) comprises a spray head (2), a connection cover (4) for connecting with a spray bottle (1), and a spray pump assembly (3) arranged on the connection cover (4) and used to cooperate with the spray head (2); the spray pump assembly (3) comprises a pump housing (31) fixedly connected to the connection cover (4), a deformable piston (32) installed on the pump housing (31), and a connection piston (33) installed on the pump housing (31) and used to cooperate with the deformable piston (32); the connection piston (33) is fixedly connected to the bottom of the spray head (2); The deformable piston (32) comprises a piston head (321), a piston rod (322) and a deformable portion (323) which are integrally connected.

2. A piston-integrated sprayer according to claim 1, characterized in that: The piston head (321) is installed in the connecting piston (33), the piston rod portion (322) is coaxially arranged and integrally connected to the center axis position of the piston head (321), the deformation portion (323) is integrally connected to the lower side of the piston head (321), and a matching gap (3211) for matching with the pump housing (31) is reserved between the outer wall of the piston rod portion (322) and the inner wall of the piston head (321).

3. A piston-integrated sprayer according to claim 2, characterized in that: The pump housing (31) comprises an inner housing (311), a bottom ring plate (312) and an outer housing (313); the inner housing (311) is coaxially arranged inside the outer housing (313); the bottom ring plate (312) is integrally connected to the outer housing (313) and the lower side of the inner housing (311); a deformation gap (314) is reserved between the inner housing (311) and the outer housing (313) for the deformation portion (323) to be inserted and deformed; the outer housing (313) is fixedly connected to the connecting cover (4) by snapping; the upper side of the inner housing (311) is inserted into the fitting gap (3211).

4. The piston-integrated sprayer according to claim 3, characterized in that: The piston rod portion (322) comprises an inner rod (3221) and an outer sleeve (3222), a gap for fluid to pass through is reserved between the inner rod (3221) and the outer sleeve (3222), a connecting rib (3223) is integrally connected between the inner rod (3221) and the outer sleeve (3222), and the connecting rib (3223) is arranged along the length direction of the inner rod (3221) and a plurality of connecting ribs (3223) are provided circumferentially along the outer wall of the inner rod (3221).

5. The piston-integrated sprayer according to claim 1, characterized in that: The deformation portion (323) is continuously provided with a plurality of corrugated sections along the length direction for guiding deformation.

6. The piston-integrated sprayer according to claim 3, characterized in that: It also includes a filter assembly (34) for filtering gas, the outer shell (313) is provided with a mounting ring portion (3131) on the upper side for mounting the filter assembly (34), the filter assembly (34) is sleeved on the outside of the connecting piston (33) and is fixedly engaged with the mounting ring portion (3131); The filter assembly (34) comprises a filter element (341), a filter element seat (342) for fixing the filter element (341), and a pressure cover (343) for abutting against the top side of the filter element (341).

7. The piston-integrated sprayer according to claim 6, characterized in that: The filter element seat (342) comprises a first ring portion (3421) for being clamped and fixed with the mounting ring portion (3131) and a second ring portion (3422) for mounting the filter element (341); the inner diameter of the second ring portion (3422) is larger than the inner diameter of the first ring portion (3421); the second ring portion (3422) is integrally connected to the outer wall of the first ring portion (3421) near the top side; the second ring portion (3422) is provided with an accommodating ring groove (34221) for clamping the filter element (341) on the inner wall near the top side of the first ring portion (3421); The first ring portion (3421) is integrally connected with a snap-fitting ridge (34211) on the outer wall close to the bottom side, and the mounting ring portion (3131) is provided with a ring groove (3132) on the inner wall circumferentially for the snap-fitting ridge (34211) to be snapped into.

8. The piston-integrated sprayer according to claim 7, characterized in that: The inner wall of the second ring portion (3422) is provided with a guide slope (34222) at a position above the accommodating ring groove (34221) for guiding the filter element (341) to be inserted.

9. The piston-integrated sprayer according to claim 8, characterized in that: The pressure cover (343) comprises a pressing ring portion (3431) and a limiting ring portion (3432) vertically arranged and integrally connected to the top side of the pressing ring portion (3431); the pressing ring portion (3431) is inserted between the inner wall of the second ring portion (3422) and the outer wall of the connecting piston (33) and pressed against the top side of the filter element (341); the outer wall of the abutting ring portion is integrally connected with a fixing ridge (34311) for snapping into the accommodating ring groove (34221); the bottom side of the limiting ring portion (3432) abuts against the top side of the second ring portion (3422).

10. The piston-integrated sprayer according to claim 6, characterized in that: The connection cover (4) has a mounting cavity for inserting the pump housing (31) at the position of the central axis, and the connection cover (4) is provided with a convex step (41) for clamping the pump housing (31) at the position of the mounting cavity.

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