WO2023030192A1

WO2023030192A1 - Fluid storage tank

Info

Publication number: WO2023030192A1
Application number: PCT/CN2022/115179
Authority: WO
Inventors: Hui Sun
Original assignee: Shenzhen Wisdom Science And Technology Co., Ltd
Priority date: 2021-08-30
Filing date: 2022-08-26
Publication date: 2023-03-09
Also published as: CN113731669B; CN113731669A

Abstract

Provided is a fluid storage tank. The fluid storage tank includes a tank body and a vent piston. The tank body is configured to store paint. A first end of the tank body is connected to a spray gun, and a second end of the tank body is provided with an air inlet. A dock is disposed on the vent piston. The dock is inserted into the air inlet. The dock is provided with a limiting protrusion. The limiting protrusion is configured to prevent the vent piston from coming out of the air inlet.

Description

FLUID STORAGE TANK

This application claims priority to Chinese Patent Application No. 202111002798. X filed with the China National Intellectual Property Administration (CNIPA) on Aug. 30, 2021, the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present application relates to the technical field of paints and coatings, for example, a fluid storage tank.

BACKGROUND

In a process of industrial spraying (such as automobile spraying) , the paint is generally produced and matched based on colors in a paint factory, and the color-matched paint is stored in closed paint cans in the paint factory. After the paint cans are transported to the places of use such as auto 4S stores, since the paint cans cannot be directly connected to a spray gun, a sprayer needs to open the closed lid of the paint can, pour the paint into a spray can specially for painting, and use the spray gun mating with the spray can to spray the paint. This process additionally increases a process of paint transfer and increases the labor intensity of the user.

In the related art, to make a storage tank be a spray tank suitable for painting, a hole needs to be made in the spray tank, and the opening of the hole involves the problem of sealing. If the storage tank is not sealed properly after the opening of the hole, the function of storing paint is affected.

In addition, the spray can used for painting is not often used as a daily storage device for paint due to the structure and material characteristics, resulting in waste when a painting process is completed by either pouring the paint left in the spray can into a dedicated storage can or simply discarding the paint.

SUMMARY

The present application provides a fluid storage tank, which can be used not only as a spray can mating with a spray gun, but also as a storage can of paint, so as to avoid an operation of frequently transferring the paint back and forth between a dedicated spray can and a dedicated storage can in the related art, thereby improving the efficiency of spraying and storing the paint.

The present application provides a fluid storage tank. The fluid storage tank includes a tank body and a vent piston. The tank body is configured to store paint. A first end of the tank body is connected to a spray gun, and a second end of the tank body is provided with an air inlet. A dock is disposed on the vent piston. The dock is inserted into the air inlet. The dock is provided with a limiting protrusion. The limiting protrusion is configured to prevent the vent piston from coming out of the air inlet.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a structural view of a fluid storage tank according to embodiment one of the present application;

FIG. 2 is a partial sectional view of a fluid storage tank when a vent piston blocks a vent hole according to embodiment one of the present application;

FIG. 3 is a partial sectional view of a fluid storage tank when a vent piston releases a vent hole according to embodiment one of the present application;

FIG. 4 is a partial sectional view of a fluid storage tank when a vent piston releases a vent hole according to embodiment one of the present application;

FIG. 5 is a structural view of a vent piston of a fluid storage tank according to embodiment one of the present application;

FIG. 6 is another partial sectional view of a fluid storage tank according to embodiment one of the present application;

FIG. 7 is a structural view of a fluid storage tank according to embodiment two of the present application;

FIG. 8 is a partial sectional view of a fluid storage tank according to embodiment two of the present application;

FIG. 9 is a structural view of a fluid storage tank according to embodiment three of the present application;

FIG. 10 is a partial sectional view of a fluid storage tank according to embodiment three of the present application;

FIG. 11 is a structural view of a fluid storage tank according to embodiment four of the present application;

FIG. 12 is a structural view of a fluid storage tank with a vent piston detached according to embodiment four of the present application;

FIG. 13 is a partial structural view of a fluid storage tank according to embodiment four of the present application;

FIG. 14 is a partial sectional view of a fluid storage tank according to embodiment four of the present application;

FIG. 15 is a partial sectional view of a fluid storage tank according to embodiment four of the present application;

FIG. 16 is a structural view of a fluid storage tank according to embodiment five of the present application;

FIG. 17 is a partial structural view of a fluid storage tank according to embodiment five of the present application;

FIG. 18 is a partial structural view of a fluid storage tank according to an embodiment of the present application;

FIG. 19 is structural view of a fluid storage tank according to an embodiment of the present application;

FIG. 20 is structural view of a fluid storage tank with a vent piston detached according to an embodiment of the present application;

FIG. 21 is structural view of a vent piston of a fluid storage tank according to an embodiment of the present application;

FIG. 22 is structural view of a vent hole of a fluid storage tank according to an embodiment of the present application;

FIG. 23 is a partial sectional view of a fluid storage tank when a vent piston blocks a vent hole according to an embodiment of the present application: and

FIG. 24 is a partial view of a pot lid of a fluid storage tank according to an embodiment of the present application.

Reference list

1 tank body

11 pot body

111 projection

1111 air inlet

1112 ratchet

112 elastic arm

1121 anti-rotation protrusion

12 pot lid

121 output pipe

122 locking thread

123 annular protrusion

1211 annular groove

124 protrusion

125 first hook

2 vent piston

21 dock

211 gradient section

212 straight section

2121 limiting protrusion

22 anti-rotation groove

23 connecting ring

24 fixing post

25 wedge

26 opening groove

27 anti-rotation limiting groove

3 adapter

31 first mating section

311 first threaded section

32 second mating section

321 second threaded section

33 ball head section

331 third threaded section

34 base section

341 fourth threaded section

35 locking section

36 body

361 second step surface

362 fifth threaded section

37 fixing ring

371 first step surface

38 elastic piece

39 locking ring

310 operating ring

320 positioning ball

330 main body

3301 second hook

3302 sixth threaded section

4 fitting

41 air flow channel

DETAILED DESCRIPTION

The technical solutions of the present application are described hereinafter in conjunction with drawings and embodiments.

In the description of the present application, it is to be understood that the orientation or position relationships indicated by terms "center" , "longitudinal" , "lateral" , "length" , "width" , "thickness" , "above" , "below" , "front" , "back" , " "left" , "right" , "vertical" , "horizontal" , "top" , "bottom" , "inside" , "outside" , "clockwise" , "counterclockwise" , "axial" , "radial" , "circumferential" , etc. are based on the orientation or position relationships shown in the drawings, merely for facilitating description of the present application and simplifying description, and do not indicate or imply that the apparatus or element referred to has a specific orientation and is constructed and operated in a specific orientation, and thus it is not to be construed as limiting the present application.

In addition, a feature defined as a "first" feature or a "second" feature may explicitly or implicitly include one or more of such features to distinguish and describe the features regardless of order or weight. In the description of the present application, unless otherwise noted, the term "aplurality of" or "multiple" means two or more.

In the description of the present disclosure, it is to be noted that unless otherwise expressly specified and limited, the term "mounted" , "connected to each other" or "connected" should be construed in a broad sense as securely connected, detachably connected or integrally connected; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or intraconnected between two components. For those of ordinary skill in the art, meanings of the preceding terms in the present application can be understood according to actual situations.

A structure of a fluid storage tank according to embodiments of the present application is described below referring to FIGS. 1 to 24.

The present application provides a fluid storage tank. As shown in FIG. 1, in this embodiment, the fluid storage tank includes a tank body 1 and a vent piston 2. The tank body 1 is configured to store paint. A first end of the tank body 1 is connected to a spray gun, and a second end of the tank body 1 is provided with an air inlet 1111. A dock 21 is disposed on the vent piston 2. The dock 21 is inserted into the air inlet 1111. The dock 21 is provided with a limiting protrusion 2121. The limiting protrusion 2121 is configured to prevent the vent piston 2 from coming out of the air inlet 1111.

It is to be understood that, in the actual use process, after a user receives a packaged fluid storage tank, the user may directly and quickly connect the fluid storage tank to a spray gun, and after determining that the connection is fastened, the user may turn the spray gun upside down and use the spray gun normally. Therefore, the fluid storage tank in this embodiment may be directly used as a spray can connected to the spray gun. Moreover, in a painting process, the vent piston 2 may be adjusted so that the dock 21 releases the air inlet 1111, and the inside of the tank body 1 communicates with the outside environment (as shown in FIG. 3) , thereby preventing a phenomenon of the unevenness of a paint flow rate due to the unsmooth air exhaust. After the painting process is completed, if there is still paint left in a pot body 11, the vent piston 2 may be adjusted again so as to make the dock 21 close the air inlet 1111 (as shown in FIG. 2) , the spray gun is turned upside down so as to remove the fluid storage tank from the spray gun, and after an adapter 3 is detached, an output pipe 121 is closed with a plug. In this manner, the fluid storage tank in this embodiment can be directly used as a paint storage device to directly achieve the paint storage function.

Additionally, it is to be noted that, since the dock 21 is provided with the limiting protrusion 2121, the limiting protrusion 2121 can limit a movement stroke of the dock 21. When the limiting protrusion 2121 abuts against an end surface of the air inlet 1111, the vent piston 2 is continuously adjusted. Due to the limiting function of the limiting protrusion 2121, the vent piston 2 continues to move along an axial direction of the vent piston 2, thereby preventing the following unfavorable phenomena: the dock 21 easily comes out of the air inlet 1111 and the vent piston 2 easily comes out of the tank body 1.

It is to be noted here that, in this embodiment, the fluid in the tank body 1 may be paint or other fluids, and the tank body 1 may be used for holding paint or may be added with other fluids, such as thinners, after the paint is filled.

In some embodiments, as shown in FIGS. 2 and 3, a projection 111 is disposed on a bottom wall of the tank body 1, the air inlet 1111 is formed on a bottom wall of the projection 111, a mating thread is disposed on a circumferential wall of the projection 111, and the vent piston 2 is provided with a mating screw hole mating with the mating thread and the dock 21 inserted into the air inlet 1111. It is to be understood that, in the actual operation process, the vent piston 2 just needs to be rotated to make the dock 21 move relative to the air inlet 1111, so as to open and close the air inlet 1111. This structure is very simple and easy to operate.

In some embodiments, as shown in FIGS. 2 and 3, the dock 21 includes a gradient section 211 and a straight section 212. A first end of the gradient section 211 is connected to a bottom wall of the mating screw hole, and a second end of the gradient section 211 is connected to the straight section 212. An outer diameter of a section of the gradient section 211 gradually decreases along a direction from the second end of the tank body 1 to the straight section 212. It is to be understood that if a dimension of the dock 21 does not change, the dimension of the dock 21 needs to be equal to a diameter of the air inlet 1111. When the vent piston 2 is rotated, the dock 21 needs to be completely separated from the air inlet 1111 so that the air inlet 1111 can be opened. In this manner, the vent piston 2 rotates more circles and is inconvenient to operate, and it is easy to unscrew the vent piston 2 directly from the projection 111. In this embodiment, the dock 21 is provided with a gradient section 211, where a diameter of a larger end of the gradient section 211 is greater than the diameter of the air inlet 1111, and a diameter of a smaller end of the gradient section 211 is less than the diameter of the air inlet 1111. In the actual operation, the vent piston 2 only needs to be rotated for a few circles so that a circulation gap exists between the dock 21 and the air inlet 1111, and the dock 21 does not need to be completely separated from the air inlet 1111, which not only facilitates the operation, but also avoids the following unfavorable case: the vent piston 2 is easily separated from the projection 111.

In some embodiments, an outer diameter of a section of the dock 21 gradually decreases along a direction from the second end of the tank body 1 to the first end of the tank body 1. A structure where the outer diameter of the section of the dock 21 gradually decreases may have various structural forms. For example, as shown in FIG. 3, the dock 21 includes the gradient section 211 and the straight section 212. The first end of the gradient section 211 is connected to the bottom wall of the mating screw hole, and the second end of the gradient section 211 is connected to the straight section 212. The outer diameter of the section of the gradient section 211 gradually decreases along the direction from the second end of the tank body 1 to the straight section 212. In this case, the decrease of the outer diameter of the section of the dock 21 is achieved by the decrease of the outer diameter of the section of the gradient section 211. In addition, as shown in FIG. 4, an outer surface of the dock 21 is similar to a tapered surface of a cone, and the dock 21 no longer distinguishes between the gradient section and the straight section, but an outer diameter of the overall structure gradually decreases. It is to be understood that, no matter whether the straight section exists or not, as long as the outer diameter of the section of the dock 21 gradually decreases along the direction from the second end of the tank body 1 to the first end of the tank body 1, the preceding technical effects can be achieved. If the dimension of the dock 21 does not change, the dimension of the dock 21 needs to be equal to the diameter of the air inlet 1111. When the vent piston 2 is rotated, the dock 21 needs to be completely separated from the air inlet 1111 so that the air inlet 1111 can be opened. In this manner, the vent piston 2 rotates more circles and is inconvenient to operate, and it is easy to unscrew the vent piston 2 directly from the projection 111. In this embodiment, a diameter of a larger end of the dock 21 is greater than the diameter of the air inlet 1111, and a diameter of a smaller end of the dock 21 is less than the diameter of the air inlet 1111. In the actual operation, the vent piston 2 only needs to be rotated for a few circles so that a circulation gap exists between the dock 21 and the air inlet 1111, and the dock 21 does not need to be completely separated from the air inlet 1111, which not only facilitates the operation, but also avoids the following unfavorable case: the vent piston 2 is easily separated from the projection 111.

Optionally, the straight section 212 is provided with a deformation groove. In this manner, during an installation process, the deformation groove can easily deform the straight section 212 so that the straight section 212 with the limiting protrusion 2121 is inserted into the air inlet 1111 smoothly, thereby facilitating the installation of the vent piston 2 to the tank body 1.

In some embodiments, the fluid storage tank further includes a fitting 4, where the fitting 4 is in an interference fit with the air inlet 1111, the fitting 4 is provided with an air flow channel 41, the dock 21 is inserted into the air flow channel 41, and the vent piston 2 is threaded to the fitting 4. It is to be understood that one fitting 4 is used for achieving the connection between the vent piston 2 and the tank body 1, thereby simplifying the structure of the tank body 1 and facilitating the installation and detachment of the vent piston 2. Optionally, the fitting 4 is a plastic part.

In some embodiments, as shown in FIG. 5, anti-rotation grooves 22 are disposed on the vent piston 2, an elastic arm 112 is disposed on a bottom wall of the tank body 1, an anti-rotation protrusion 1121 is disposed on the elastic arm 112, and the anti-rotation protrusion 1121 fits in the anti-rotation groove 22. It is to be understood that, to avoid the phenomenon that the air inlet 1111 is accidentally opened due to the rotation of the vent piston 2, the anti-rotation protrusion 1121 on the elastic arm 112 can mate with the anti-rotation groove 22 so that during the use of the fluid storage tank, the anti-rotation protrusion 1121 can limit the rotation of the vent piston 2, thereby avoiding the unfavorable case of the opening of the air inlet 1111 caused by the accidental rotation of the vent piston 2. The anti-rotation protrusion 1121 is disposed on the elastic arm 112, and when the vent piston 2 needs to be rotated, the user only needs to twist the elastic arm 112 to deform the elastic arm 112 so that the anti-rotation protrusion 1121 is separated from the anti-rotation groove 22. Therefore, the additional elastic arm 112 and anti-rotation protrusion 1121 not only can avoid the unfavorable case of the opening of the air inlet 1111 caused by the accidental rotation of the vent piston 2, but also do not cause difficulty for the user to rotate the vent piston 2, thereby improving the operational reliability of the fluid storage tank.

In some embodiments, as shown in FIGS. 19 to 23, anti-rotation limiting grooves 27 may be concavely disposed on an inner circumferential wall of the vent piston 2, ratchets 1112 may be convexly disposed on an outer circumferential wall of the projection 111, and one of the ratchets 1112 is disposed in and mates with a respective one of the anti-rotation limiting grooves 27, so as to prevent the ratchets 1112 from rotating relative to the anti-rotation limiting grooves 27 and prevent the vent piston 2 from rotating relative to the projection 111. Multiple anti-rotation limiting grooves 27 may be provided and arranged along a circumferential direction of the vent piston 2. Multiple ratchets 1112 may be provided and arranged along a circumferential direction of the projection 111. The number of the anti-rotation limiting grooves 27 may be different from the number of the ratchets 1112.

It is to be understood that, to prevent the air inlet 1111 from being accidentally opened due to rotation of the vent piston 2, the ratchets 1112 can mate with the anti-rotation limiting grooves 27. In this manner, when the fluid storage tank is in use, the rotation of the vent piston 2 can be restricted, thereby preventing the following unfavorable case where the air inlet 1111 is opened caused by the accidental rotation of the vent piston 2. When the fluid storage tank is in use, the anti-rotation limiting grooves 27 are annularly disposed on the inner circumferential wall of the vent piston 2, and the user rotates the vent piston 2 and makes the ratchets 1112 separated from the anti-rotation limiting grooves 27. Therefore, the anti-rotation limiting grooves 27 and the ratchets 1112 are provided, so as to prevent the following unfavorable case where the air inlet 1111 is opened caused by the accidental rotation of the vent piston 2, thereby improving the operational reliability of the fluid storage tank.

In some embodiments, as shown in FIG. 18, a connecting ring 23 is fixed on the bottom wall of the tank body 1, and multiple fixing posts 24 are connected between the vent piston 2 and the connecting ring 23. The fixing posts 24 are configured to break, when the vent piston 2 rotates relative to the connecting ring 23 so that a force applied to the fixing posts 24 exceeds a force limit of the fixing posts 24. It is to be understood that the fixing posts 24 break when a rotational force on the vent piston 2 exceeds the force limit of the fixing posts 24. In this embodiment, one connecting ring 23 is provided at a bottom of the tank, the bottom of the vent piston 2 and the connecting ring 23 are connected by the fixing posts 24 (or fixing points) relatively small in volume, and the vent piston 2 is kept immobile so that the vent piston 2 does not open by itself during transportation. In the embodiment as shown in FIG. 18, the fixing posts 24 act as one-offs and cease to function when the fixing posts 24 break due to the force exceeding the force limit.

In some embodiments, a wedge 25 may be convexly disposed on one of the vent piston 2 and the connecting ring 23, and an opening groove 26 is concavely disposed on the other one of the vent piston 2 and the connecting ring 23. The wedge 25 extends into the opening groove 26, an inner side surface of the opening groove 26 is a sloping surface, and the wedge 25 and the sloping surface are configured to slidably mate with each other when the vent piston 2 and the connecting ring 23 rotate relative to each other so that the vent piston 2 and the connecting ring 23 move away from each other. It is to be understood that the wedge 25 is a wedge protrusion, and when the vent piston 2 rotates along an opening direction, the vent piston 2 moves upward along the wedge surface so that the vent piston 2 is separated from the connecting ring 23.

In some embodiments, as shown in FIG. 1, the tank body 1 includes a pot body 11 and a pot lid 12. A first end of the pot body 11 is open, a second end of the pot body 11 is closed, and the air inlet 1111 is disposed at the second end of the pot body 11. The pot lid 12 fits at the first end of the pot body 11, and an end of the pot lid 12 facing away from the pot body 11 is connected to the spray gun. It is to be understood that the pot body 11 and the pot lid 12 have various connection methods. In some embodiments, as shown in FIG. 1, the pot body 11 mates with the pot lid 12 by threads; in some embodiments, as shown in FIG. 11, the pot body 11 and the pot lid 12 are connected by welding, crimping and other connection methods. That is, in the present application, the pot body 11 and the pot lid 12 may be made into a detachable structure according to actual requirements, which is convenient to add paint; the pot body 11 and the pot lid 12 may also be made into a non-detachable structure according to actual requirements, so as to improve the sealing property of the tank body 1 and facilitate transportation.

In some embodiments, as shown in FIG. 1, multiple protrusions 124 are disposed on the pot lid 12 at intervals along a circumferential direction of the pot lid 12. According to the foregoing, in the actual use process, the tank body 1 is upside down, and the protrusions 124 on the pot lid 12 are convenient for the user to hold, thereby facilitating the user to use.

In some embodiments, as shown in FIG. 6, an output pipe 121 is disposed at a first end of the tank body 1, and the output pipe 121 is connected to the spray gun through an adapter 3. It is to be understood that the output pipe 121 is connected to the adapter 3, thereby facilitating the connection between the tank body 1 and the adapter 3. Moreover, if the output pipe 121 is directly connected to the spray gun, the tank body 1 may only be applied to one type of spray gun. In this embodiment, the adapter 3 is connected to the spray gun. In the actual operation process, the adapter 3 is selected according to the type of the spray gun so that the fluid storage tank in this embodiment mates with various spray guns, so as to expand the application range of the fluid storage tank in this embodiment, thereby improving the user satisfaction.

In some embodiments, as shown in FIG. 6, an outlet end of the output pipe 121 is provided with a locking thread 122, the outlet end is threaded to the adapter 3, an inlet end of the output pipe 121 is provided with an annular protrusion 123, and the annular protrusion 123 is inserted into the adapter 3. It is to be understood that the annular protrusion 123 is inserted into the adapter 3, so as to improve the connection stability between the pot lid 12 and the adapter 3, thereby ensuring the connection stability between the entire fluid storage tank and the spray gun. The locking thread 122 at the outlet end may improve the connection stability between the pot lid 12 and the adapter 3 on the one hand, and improve the sealing performance of the connection between the pot lid 12 and the adapter 3 on the other hand, so as to avoid a possibility of paint flowing through a connection gap between the adapter 3 and the pot lid 12 during the painting process.

In some embodiments, as shown in FIG. 6, the adapter 3 includes a first mating section 31 and a second mating section 32. The first mating section 31 is inserted into the output pipe 121 and sleeved on the annular protrusion 123, and the first mating section 31 is provided with a first threaded section 311 mating with the locking thread 122. A second threaded section 321 is disposed at an end of the second mating section 32 facing away from the first mating section 31, and the second threaded section 321 is connected to the spray gun. It is to be understood that, after inserted into the output pipe 121, the first mating section 31 is sleeved on the annular protrusion 123. That is, the first mating section 31 is sandwiched between an inner circumferential wall of the output pipe 121 and an outer circumferential wall of the annular protrusion 123, so as to not only improve the connection stability between the adapter 3 and the pot lid 12, but also improve the sealing performance of the connection between the adapter 3 and the pot lid 12. The second threaded section 321 mates with the locking thread 122, thereby facilitating the installation of the adapter 3 on the one hand so that in the process of installing the adapter 3, the adapter 3 only needs to be rotated; and on the other hand, the stability and sealing performance of the connection between the adapter 3 and the output pipe 121 are also improved. The second mating section 32 uses the second threaded section 321 to mate with the spray gun, so as to simplify the connection operation between the adapter 3 and the spray gun on the one hand, and ensure the stability and sealing performance of the connection between the adapter 3 and the spray gun on the other hand.

In some embodiments, as shown in FIG. 8, the adapter 3 includes a ball head section 33, a base section 34, and a locking section 35. An end of the ball head section 33 facing away from a ball head is inserted into the output pipe 121 and sleeved on the annular protrusion 123. The ball head section 33 is provided with a third threaded section 331 mating with the locking thread 122. A first end of the base section 34 mates with the ball head of the ball head section 33, and a fourth threaded section 341 mating with the spray gun is disposed at a second end of the base section 34. The locking section 35 is screwed on the base section 34 and restricts the ball head of the ball head section 33 on the base section 34. It is to be understood that, after inserted into the output pipe 121, the ball head section 33 is sleeved on the annular protrusion 123. That is, the ball head section 33 is sandwiched between an inner circumferential wall of the output pipe 121 and an outer circumferential wall of the annular protrusion 123, so as to not only improve the connection stability between the adapter 3 and the pot lid 12, but also improve the sealing performance of the connection between the adapter 3 and the pot lid 12. The ball head of the ball head section 33 fits in the base section 34, that is, the ball head section 33 can rotate relative to the base section 34, so that in the actual use process, the pot lid 12 can rotate relative to the spray gun, which is convenient to use the spray gun in scenarios with different requirements. The additional locking section 35 can ensure the connection stability between the base section 34 and the ball head section 33, avoid the failure phenomenon that the ball head section 33 is separated from the base section 34, and ensure the operational reliability of the fluid storage tank provided in this embodiment.

Additionally, on the one hand, the base section 34 mates with the locking thread 122 through the third threaded section 331, thereby facilitating the installation of the adapter 3so that in the process of installing the adapter 3, the base section 34 only needs to be rotated; and on the other hand, the stability and sealing performance of the connection between the adapter 3 and the output pipe 121 are also improved. The base section 34 uses the third threaded section 331 to mate with the spray gun, so as to simplify the connection operation between the adapter 3 and the spray gun on the one hand, and ensure the stability and sealing performance of the connection between the adapter 3 and the spray gun on the other hand.

In some embodiments, the output pipe 121 is inserted into the adapter 3. Compared with the threaded connection described above, the output pipe 121 is inserted into the adapter 3 to achieve the connection so that the connection structure of the output pipe 121 and the adapter 3 is simpler and the operation is convenient.

In some embodiments, as shown in FIG. 10, an annular groove 1211 is disposed on an outer circumferential wall of the output pipe 121. The adapter 3 includes a body 36 and a fixing ring 37. The body 36 is sleeved on the output pipe 121, positioning balls 320 are disposed on the body 36 along a circumferential direction of the body 36, the positioning balls 320 fit in the annular groove 1211, and a fifth threaded section 362 mating with the spray gun is disposed at an end of the body 36 facing away from the output pipe 121. The fixing ring 37 is sleeved on the body 36. It is to be understood that, in the actual operation process, after the positioning balls 320 are installed on the body 36, the body 36 is sleeved on the output pipe 121, and the body 36 is pushed so that the positioning balls 320 enter the annular groove 1211, thereby completing the connection between the pot lid 12 and the adapter 3. This connection method is very simple, and it is convenient for the user to connect the adapter 3 to the pot lid 12.

In some embodiments, as shown in FIG. 10, a first step surface 371 is disposed on an inner circumferential wall of the fixing ring 37, and a second step surface 361 is disposed on an outer circumferential wall of the body 36; and the adapter 3 further includes an elastic piece 38 and a locking ring 39. The elastic piece 38 is sleeved on the body 36, a first end of the elastic piece 38 abuts against the first step surface 371, and a second end of the elastic piece 38 abuts against the second step surface 361; and the locking ring 39 is sleeved on the body 36 to lock the body 36 on the output pipe 121. It is to be understood that, in the installation process, the fixing ring 37 is first pushed to compress the elastic piece 38 so that part of the body 36 hidden by the fixing ring 37 extends out of the fixing ring 37, which facilitates that the user inserts the output pipe 121 into the body 36. After the connection is completed, the actual action on the fixing ring 37 is removed, and the fixing ring 37 is reset under the action of the elastic piece 38 so that the fixing ring 37 does not need to be manually reset.

Optionally, an operating ring 310 is sleeved on the fixing ring 37, and one or more operating handles are disposed on a circumferential wall of the operating ring 310 so that the user may press the fixing ring 37 by pressing the operating handle, which is very convenient to operate.

Structures of fluid storage tanks according to five embodiments of the present application are described below referring to FIGS. 1 to 17.

Embodiment one

A fluid storage tank according to the first embodiment of the present application is described below referring to FIGS. 1 to 6.

The fluid storage tank provided in this embodiment includes the tank body 1, the vent piston 2, and the adapter 3, where the tank body 1 includes the pot body 11 and the pot lid 12. The first end of the pot body 11 is open, and the second end of the pot body 11 is closed. The projection 111 and the elastic arm 112 are disposed at the second end of the pot body 11. The air inlet 1111 is formed on the bottom wall of the projection 111. The mating thread is disposed on the circumferential wall of the projection 111. The pot lid 12 is fastened on and threaded to the pot body 11. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11, the inlet end of the output pipe 121 is provided with the annular protrusion 123, and the outlet end of the output pipe 121is provided with the locking thread 122. The anti-rotation protrusion 1121 is disposed on the elastic arm 112. The vent piston 2 is provided with the mating screw hole mating with the mating thread and the dock 21 inserted into the air inlet 1111.

The dock 21 includes the gradient section 211 and the straight section 212. The first end of the gradient section 211 is connected to the bottom wall of the mating screw hole, and the second end of the gradient section 211 is connected to the straight section 212. The outer diameter of the section of the gradient section 211 gradually decreases along the direction from the second end of the tank body 1 to the straight section 212. The straight section 212 is provided with a limiting protrusion 2121, where the limiting protrusion 2121 can abut against an inner circumferential bottom wall of the projection 111. Multiple anti-rotation grooves 22 are disposed on an outer circumferential wall of the vent piston 2 at intervals, and one ofthe anti-rotation grooves 22 mates with the anti-rotation protrusion 1121.

Alternatively, an end of the dock 21 is connected to the bottom wall of the mating screw hole, and the outer diameter of the section of the dock 21 gradually decreases along the direction from the second end of the tank body 1 to the first end of the tank body 1. The dock 21 is provided with the limiting protrusion 2121, where the limiting protrusion 2121 can abut against an inner circumferential bottom wall of the projection 111. Multiple anti-rotation grooves 22 are disposed on an outer circumferential wall of the vent piston 2 at intervals, and the anti-rotation groove 22 mates with the anti-rotation protrusion 1121.

The adapter 3 includes the first mating section 31 and the second mating section 32, where the first mating section 31 is inserted into the output pipe 121 and sleeved on the annular protrusion 123. The first mating section 31 is provided with the first threaded section 311 mating with the locking thread 122. The second threaded section 321 is disposed at an end of the second mating section 32 facing away from the first mating section 31, and the second threaded section 321 is connected to the spray gun.

Embodiment two

A fluid storage tank according to the second embodiment of the present application is described below referring to FIGS. 7 and 8.

The fluid storage tank provided in this embodiment includes the tank body 1, the vent piston 2, and the adapter 3, where the tank body 1 includes the pot body 11 and the pot lid 12. The first end of the pot body 11 is open, and the second end of the pot body 11 is closed. The pot lid 12 is fastened on and threaded to the pot body 11. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11. The inlet end of the output pipe 121 is provided with the annular protrusion 123, and the outlet end of the output pipe 121 is provided with the locking thread 122. The adapter 3 includes the ball head section 33, the base section 34, and the locking section 35. An end of the ball head section 33 facing away from the ball head is inserted into the output pipe 121 and sleeved on the annular protrusion 123. The ball head section 33 is provided with the third threaded section 331 mating with the locking thread 122. The first end of the base section 34 mates with the ball head of the ball head section 33, and the fourth threaded section 341 mating with the spray gun is disposed at the second end of the base section 34. The locking section 35 is screwed on the base section 34 and restricts the ball head of the ball head section 33 on the base section 34. A mating structure between the vent piston 2 and the tank body 1 in this embodiment is the same as that of the first embodiment and is not repeated here.

Embodiment three

A fluid storage tank according to the third embodiment of the present application is described below referring to FIGS. 9 and 10.

The fluid storage tank provided in this embodiment includes the tank body 1, the vent piston 2, and the adapter 3. The tank body 1 includes the pot body 11 and the pot lid 12. The first end of the pot body 11 is open, and the second end of the pot body 11 is closed. The pot lid 12 is fastened on and threaded to the pot body 11. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11. The annular groove 1211 is disposed on the outer circumferential wall of the output pipe 121. The adapter 3 includes the body 36, the fixing ring 37, the elastic piece 38, the locking ring 39, and the operating ring 310. The body 36 is sleeved on the output pipe 121. The positioning balls 320 are disposed on the body 36 along the circumferential direction of the body 36. The positioning balls 320 fit in the annular groove 1211. The second step surface 361 is disposed on the outer circumferential wall of the body 36. The fifth threaded section 362 mating with the spray gun is disposed at an end of the body 36 facing away from the output pipe 121. The fixing ring 37 is sleeved on the body 36, and the first step surface 371 is disposed on the inner circumferential wall of the fixing ring 37. The elastic piece 38 is sleeved on the body 36, the first end of the elastic piece 38 abuts against the first step surface 371, and the second end of the elastic piece 38 abuts against the second step surface 361; and the locking ring 39 is sleeved on the body 36 to lock the body 36 on the output pipe 121. The operating ring 310 is sleeved on the fixing ring 37, and two operating handles are disposed on the circumferential wall of the operating ring 310.

A mating structure between the vent piston 2 and the tank body 1 in this embodiment is the same as that of the first embodiment and is not repeated here.

Embodiment four

A fluid storage tank according to the fourth embodiment of the present application is described below referring to FIGS. 11 to 15.

The fluid storage tank provided in this embodiment includes the tank body 1, the vent piston 2, the adapter 3, and the fitting 4. The tank body 1 includes the pot body 11 and the pot lid 12. The pot body 11 and the pot lid 12 are connected by stamping, and the pot body 11 and the pot lid 12 are non-detachably connected. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11, and the inlet end of the output pipe 121 is provided with a first hook 125. The anti-rotation protrusion 1121 is disposed on the elastic arm 112. The fitting 4 is in an interference fit with the air inlet 1111, and the fitting 4 is provided with the air flow channel 41. The fitting 4 is provided with the elastic arm 112, and the anti-rotation protrusion 1121 is disposed on the elastic arm 112. The vent piston 2 mates with the fitting 4 by threads, and the vent piston 2 is provided with the dock 21 inserted into the air flow channel 41.

The dock 21 includes the gradient section 211 and the straight section 212. The first end of the gradient section 211 is connected to the bottom wall of the mating screw hole, and the second end of the gradient section 211 is connected to the straight section 212. The outer diameter of the section of the gradient section 211 gradually decreases along the direction from the second end of the tank body 1 to the straight section 212. The straight section 212 is provided with the limiting protrusion 2121, where the limiting protrusion 2121 can abut against an inner circumferential bottom wall of the projection 111. Multiple anti-rotation grooves 22 are disposed on an outer circumferential wall of the vent piston 2 at intervals, and the anti-rotation groove 22 mates with the anti-rotation protrusion 1121.

The adapter 3 includes a main body 330. Second hooks 3301 are disposed at an end of the main body 330. Multiple second hooks 3301 are arranged at intervals. The main body 330 is sleeved on the output pipe 121, and the second hook 3301 is hooked to the first hook 125. A sixth threaded section 3302 mating with the spray gun is disposed at an end of the body 36 facing away from the output pipe 121.

Embodiment five

As shown in FIGS. 16 and 17, the fluid storage tank provided in this embodiment includes the tank body 1, the vent piston 2, and the adapter 3, where the tank body 1 includes the pot body 11 and the pot lid 12. The first end of the pot body 11 is open, and the second end of the pot body 11 is closed. The pot lid 12 is fastened on and threaded to the pot body 11. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11. The inlet end of the output pipe 121 is provided with the first hook 125. The adapter 3 includes a main body 330. Second hooks 3301 are disposed at an end of the main body 330. Multiple second hooks 3301 are arranged at intervals. The main body 330 is sleeved on the output pipe 121, and the second hook 3301 is hooked to the first hook 125. A sixth threaded section 3302 mating with the spray gun is disposed at an end of the body 36 facing away from the output pipe 121.

Embodiment six

A fluid storage tank according to the sixth embodiment of the present application is described below referring to FIGS. 19 to 23.

The fluid storage tank according to this embodiment includes the tank body 1, the vent piston 2, and the adapter 3. The tank body 1 includes the pot body 11 and the pot lid 12. The first end of the pot body 11 is open, and the second end of the pot body 11 is closed. The projection 111 is disposed at the second end of the pot body 11. The air inlet 1111 is formed on the bottom wall of the projection 111. The mating thread is disposed on the circumferential wall of the projection 111. The pot lid 12 is fastened on and threaded to the pot body 11. The output pipe 121 is disposed at an end of the pot lid 12 facing away from the pot body 11. The inlet end of the output pipe 121 is provided with the annular protrusion 123, and the outlet end of the output pipe 121 is provided with the locking thread 122. The vent piston 2 is provided with the mating screw hole mating with the mating thread, and the dock 21 inserted into the air inlet 1111.

The dock 21 includes the gradient section 211 and the straight section 212. The first end of the gradient section 211 is connected to the bottom wall of the mating screw hole, and the second end of the gradient section 211 is connected to the straight section 212. The outer diameter of the section of the gradient section 211 gradually decreases along the direction from the second end of the tank body 1 to the straight section 212. The straight section 212 is provided with the limiting protrusion 2121, where the limiting protrusion 2121 can abut against an inner circumferential bottom wall of the projection 111. Alternatively, an end of the dock 21 is connected to the bottom wall of the mating screw hole, and the outer diameter of the section of the dock 21 gradually decreases along the direction from the second end of the tank body 1 to the first end of the tank body 1. The dock 21 is provided with the limiting protrusion 2121, where the limiting protrusion 2121 can abut against an inner circumferential bottom wall of the projection 111.

Optionally, anti-rotation limiting grooves 27 may be concavely disposed on an inner circumferential wall of the vent piston 2, ratchets 1112 may be convexly disposed on an outer circumferential wall of the projection 111, and one of the ratchets 1112 is disposed in and mates with a respective one of the anti-rotation limiting grooves 27, so as to prevent the vent piston 2 from rotating relative to the projection 111.

It is to be understood that, to avoid the phenomenon that before the first use, for example, the vent piston 2 is loosened due to bumps during transportation, causing the air inlet 1111 to be accidentally opened, the ratchets 1112 can mate with the anti-rotation limiting grooves 27. In this manner, during the transportation of the fluid storage tank, the rotation of the vent piston 2 can be restricted, so as to prevent the following unfavorable case where the air inlet 1111 is opened caused by the accidental rotation of the vent piston 2, thereby improving the operational reliability of the fluid storage tank during transportation.

When transportation of the fluid storage tank is completed, and the fluid storage tank is used for the first time, the user may forcefully rotate the vent piston 2 in a direction of unscrewing so that the anti-rotation limiting grooves 27 or the ratchets 1112 are broken. In this manner, the locking of the anti-rotation limiting grooves 27 and the ratchets1112 is invalid, and it is no longer necessary to use the cooperative locking function of the anti-rotation limiting grooves 27 and the ratchets 1112.

Optionally, the adapter 3 includes the first mating section 31 and the second mating section 32, where the first mating section 31 is inserted into the output pipe 121 and sleeved on the annular protrusion 123. The first mating section 31 is provided with the first threaded section 311 mating with the locking thread 122. The second threaded section 321 is disposed at an end of the second mating section 32 facing away from the first mating section 31, and the second threaded section 321 is connected to the spray gun.

Claims

A fluid storage tank, comprising:

a tank body (1) configured to store paint, wherein a first end of the tank body (1) is connected to a spray gun, and a second end of the tank body (1) is provided with an air inlet (1111) ; and

a vent piston (2) , wherein a dock (21) is disposed on the vent piston (2) , the dock (21) is inserted into the air inlet (1111) , the dock (21) is provided with a limiting protrusion (2121) , and the limiting protrusion (2121) is configured to prevent the vent piston (2) from coming out of the air inlet (1111) .
The fluid storage tank of claim 1, wherein an outer diameter of a section of the dock (21) gradually decreases along a direction from the second end of the tank body (1) to the first end of the tank body (1) .
The fluid storage tank of claim 1, wherein the dock (21) comprises a gradient section (211) and a straight section (212) , wherein a first end of the gradient section (211) is connected to a bottom wall of a mating screw hole, a second end of the gradient section (211) is connected to the straight section (212) , and an outer diameter of a section of the gradient section (211) gradually decreases along a direction from the second end of the tank body (1) to the straight section (212) .
The fluid storage tank of claim 1, wherein a projection (111) is disposed on a bottom wall of the tank body (1) , the air inlet (1111) is formed on a bottom wall of the projection (111) , a mating thread is disposed on a circumferential wall of the projection (111) , and the vent piston (2) is provided with a mating screw hole mating with the mating thread.
The fluid storage tank of claim 1, wherein anti-rotation grooves (22) are disposed on the vent piston (2) , an elastic arm (112) is disposed on a bottom wall of the tank body (1) , an anti-rotation protrusion (1121) is disposed on the elastic arm (112) , and the anti-rotation protrusion (1121) fits in one of the anti-rotation grooves (22) .
The fluid storage tank of claim 1, wherein a connecting ring (23) is fixed on a bottom wall of the tank body (1) , and a plurality of fixing posts (24) are connected between the vent piston (2) and the connecting ring (23) , wherein the plurality of fixing posts (24) are configured to break, when the vent piston (2) rotates relative to the connecting ring (23) so that a force applied to the plurality of fixing posts (24) exceeds a force limit of the plurality of fixing posts (24) .
The fluid storage tank of claim 6, wherein a wedge (25) is convexly disposed on one of the vent piston (2) and the connecting ring (23) , and an opening groove (26) is concavely disposed on another one of the vent piston (2) and the connecting ring (23) , wherein the wedge (25) extends into the opening groove (26) , an inner side surface of the opening groove (26) is a sloping surface, and the wedge (25) and the sloping surface are configured to slidably mate with each other when the vent piston (2) and the connecting ring (23) rotate relative to each other so that the vent piston (2) and the connecting ring (23) move away from each other.
The fluid storage tank of claim 1, further comprising a fitting (4) , wherein the fitting (4) is in an interference fit with the air inlet (1111) , the fitting (4) is provided with an air flow channel (41) , the dock (21) is inserted into the air flow channel (41) , and the vent piston (2) is threaded to the fitting (4) .
The fluid storage tank of any one of claims 1 to 8, wherein the tank body (1) comprises:

a pot body (11) , wherein a first end of the pot body (11) is open, a second end of the pot body (11) is closed, and the air inlet (1111) is disposed at the second end of the pot body (11) ; and

a pot lid (12) , wherein the pot lid (12) fits at the first end of the pot body (11) , and an end of the pot lid (12) facing away from the pot body (11) is connected to the spray gun.
The fluid storage tank of claim 9, wherein a plurality of protrusions (124) are disposed on the pot lid (12) at intervals along a circumferential direction of the pot lid (12) .
The fluid storage tank of any one of claims 1 to 8, wherein an output pipe (121) is disposed at an end of the tank body (1) , the output pipe (121) is connected to the spray gun through an adapter (3) , an outlet end of the output pipe (121) is provided with a locking thread (122) , the outlet end is threaded to the adapter (3) , an inlet end of the output pipe (121) is provided with an annular protrusion (123) , and the annular protrusion (123) is inserted into the adapter (3) ;

wherein the adapter (3) comprises a first mating section (31) and a second mating section (32) , wherein the first mating section (31) is inserted into the output pipe (121) and sleeved on the annular protrusion (123) , and the first mating section (31) is provided with a first threaded section (311) mating with the locking thread (122) ; and a second threaded section (321) is disposed at an end of the second mating section (32) facing away from the first mating section (31) , and the second threaded section (321) is connected to the spray gun; or

the adapter (3) comprises a ball head section (33) , a base section (34) , and a locking section (35) , wherein an end of the ball head section (33) facing away from a ball head is inserted into the output pipe (121) and sleeved on the annular protrusion (123) , and the ball head section (33) is provided with a third threaded section (331) mating with the locking thread (122) ; a first end of the base section (34) mates with the ball head of the ball head section (33) , and a fourth threaded section (341) mating with the spray gun is disposed at a second end of the base section (34) ; and the locking section (35) is screwed on the base section (34) and restricts the ball head of the ball head section (33) on the base section (34) .
The fluid storage tank of any one of claims 1 to 8, wherein an output pipe (121) is disposed at an end of the tank body (1) , and the output pipe (121) is connected to the spray gun through an adapter (3) and inserted into the adapter (3) .
The fluid storage tank of claim 12, wherein an annular groove (1211) is disposed on an outer circumferential wall of the output pipe (121) ; and the adapter (3) comprises:

a body (36) , wherein the body (36) is sleeved on the output pipe (121) , positioning balls (320) are disposed on the body (36) along a circumferential direction of the body (36) , the positioning balls (320) fit in the annular groove (1211) , and a fifth threaded section (362) mating with the spray gun is disposed at an end of the body (36) facing away from the output pipe (121) ;

a fixing ring (37) , wherein the fixing ring (37) is sleeved on the body (36) , a first step surface (371) is disposed on an inner circumferential wall of the fixing ring (37) , and a second step surface (361) is disposed on an outer circumferential wall of the body (36) ;

an elastic piece (38) , wherein the elastic piece (38) is sleeved on the body (36) , a first end of the elastic piece (38) abuts against the first step surface (371) , and a second end of the elastic piece (38) abuts against the second step surface (361) ; and

a locking ring (39) sleeved on the body (36) to lock the body (36) on the output pipe (121) .
The fluid storage tank of claim 1, wherein anti-rotation limiting grooves (27) are concavely disposed on an inner circumferential wall of the vent piston (2) , ratchets (1112) are convexly disposed on an outer circumferential wall of a projection (111) , and one of the ratchets (1112) is disposed in and mates with a respective one of the anti-rotation limiting grooves (27) , so as to prevent the vent piston (2) from rotating relative to the projection (111) .