Cup cover of fluid supply cup and fluid supply device

Abstract

The invention provides a fluid supply cup cover and a fluid supplier, the fluid supply cup cover comprises a cover body with one end being a liquid inlet and the other end being a liquid outlet, the side wall of the cover body extends from the liquid inlet to the liquid outlet, the corresponding part of the liquid inlet is used for being connected with a cup body of a fluid supply cup, the side wall extends at the liquid inlet to form a barrel-shaped wall, and the barrel-shaped wall is provided with a liquid outlet. The extension surface of the barrel-shaped wall is parallel to the axis of the liquid inlet to form a parallel flow guide direction; an included angle is formed between the extending surface of the side wall between the liquid inlet and the liquid outlet and the axis of the liquid outlet, and the extending surface of the side wall forms an inclined flow guide direction, and is characterized in that a filter is arranged on the cup cover, a filtering area parallel to the flow guide direction and perpendicular to the filter is arranged on the liquid inlet side of the filter, and a filtering area parallel to the flow guide direction and perpendicular to the filter is arranged on the liquid outlet side of the filter. An included angle is formed between the inclined diversion direction and the filter area of the filter. It is guaranteed that the maximum gravity decomposition force is obtained in the flow guide direction, paint can overcome the resistance of the filter screen conveniently, the paint passing through the filter screen keeps a certain flow speed, and the liquid supply amount is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of spraying equipment and relates to a spray cup, in particular to a cup cover of a fluid supply cup and a fluid supplier. Background Art

[0002] The liquid supply device generally refers to a paint spray cup, which is used to store paint. When in use, the paint spray cup is connected to a spray gun to spray the paint inside the paint spray cup. There are two main types of paint spray cups on the market: one is composed of a cup body and a cup cover. The other is composed of a rigid outer cup, an inner liner, and a cup cover. The inner liner needs to be placed in the rigid outer cup, and then the inner liner and the rigid outer cup are sealed with the cup cover, and the rigid outer cup, the inner liner and the cup cover are fixed into an integrated structure, and then connected to the spray gun.

[0003] For example, Chinese patent document CN101060935A discloses a liquid supply and filtration assembly, comprising: a cover component, the cover component comprising: a first end suitable for connecting to a liquid reservoir capable of containing one or more liquids, a second end opposite to the first end, an inner surface and an outer surface extending from the first end to the second end, and an opening extending through a portion of the cover component from the first end to the second end; and a first detachably connected filter component connected to the inner surface of the cover component, the first detachably connected filter component comprising: a first filter screen, and a first filter screen protrusion extending from the first filter screen.

[0004] In the above technical solution, the cover includes a conical outer surface and a cylindrical lower part, and the conical large-diameter opening is connected to the cylindrical lower part. Combined with the figure, the filter screen is arranged inside the conical outer surface, so that the diameter of the filter screen is smaller than the diameter of the cylindrical lower part, thereby limiting the filtering area and failing to fully utilize the internal space of the cover to form the maximum filtering area, affecting the filtering efficiency and further reducing the liquid supply rate.

[0005] On the other hand, usually in the painting operation, the cup cover and the spray cup are in a vertical inverted or slightly tilted inverted state, and the paint in the spray cup passes through the filter component under the action of its own gravity. The filter component is set to filter and has a certain blocking effect on the paint. The force value of the paint passing through the filter area is equal to the decomposition force of the paint gravity in the diversion direction. In the prior art, the filter component is set inside the cone. Because the inner surface of the cone is a gathering structure with a gradually decreasing diameter, under the guidance of the cone cylinder wall, the inclined diversion direction forms an acute angle with the filter area; it is obvious that there is a large angle between the inclined diversion direction and the vertical downward gravity direction, which causes most of the gravity to act on the inner surface of the cone, that is, it is blocked by the inner surface of the cone and weakens most of the gravity. Only a small part of the gravity forms a decomposition force to drive the paint through the filter component, which significantly reduces the power and flow rate of the paint through the filter component. As a result, the paint is prone to hanging on the net and retention, resulting in gradual clogging of the filter component, which not only affects the supply rate of the paint, but also shortens the service life of the filter.

[0006] Furthermore, to set the filter component inside the cone, a raised portion for mounting the filter component must be set on the inclined inner surface of the cone, which increases the structural complexity of the inner surface of the cone, increases the difficulty of mold opening, and increases the problem of injection shrinkage on the surface of the cone, resulting in a decrease in the quality of the finished product. The complex inner surface structure of the cone creates resistance to the outflow of paint, reduces the supply rate of paint, and affects the spraying effect; and the complex inner surface structure of the cone also increases the overall weight of the lid and increases material costs.

[0007] Furthermore, in the existing cover structure, in order to provide a mounting structure for the filter component, an annular rib structure is raised on the inner surface of the cone, and an annular gap is formed between the annular rib structure and the inner surface of the cone. When the cover is inverted to supply liquid, the paint flows into the annular gap and is retained and cannot be normally output. Since the cost of some paints is high, the paint is wasted. In addition, after replacing the lining and paint, the remaining paint in the annular gap mixes with the new paint, causing the old paint to contaminate the new paint, affecting the spraying quality and effect. Summary of the invention

[0008] The purpose of the present invention is to solve the above problems in the prior art and to provide a cup cover for a fluid supply cup and a fluid supplier.

[0009] The objective of the present invention can be achieved through the following technical solutions: a cup cover of a fluid supply cup, comprising a cover body with a liquid inlet at one end and a liquid outlet at the other end, the side wall of the cover body extending from the liquid inlet to the liquid outlet, the corresponding part of the liquid inlet being used to connect with the cup body of the fluid supply cup, the side wall extending at the liquid inlet to form a barrel-shaped wall, the extended surface of the barrel-shaped wall being parallel to the axis of the liquid inlet, forming a parallel flow guiding direction; the extended surface of the side wall between the liquid inlet and the liquid outlet is arranged at an angle to the axis of the liquid outlet, the extended surface of the side wall forms an inclined flow guiding direction, a filter is arranged on the cup cover, on the liquid inlet side of the filter, the parallel flow guiding direction is perpendicular to the filtering area of ​​the filter, and on the liquid outlet side of the filter, the inclined flow guiding direction forms an angle with the filtering area of ​​the filter.

[0010] In the cup cover of the fluid supply cup, an annular structure that can serve as a base for gluing or pressing a filter screen is arranged on the side wall. There is a spacing space between the annular structure and the barrel wall, and the corresponding part of the skeleton of the filter fills the spacing space.

[0011] In the above-mentioned cup cover of the fluid supply cup, the annular structure is any one of an annular rib, an annular platform or an annular pressed area.

[0012] In the cup cover of the fluid supply cup, the frame is a ring-shaped frame, and a filter is arranged inside the frame; a side surface of the frame has an annular boss that matches the shape of the spacing space, and the annular boss is embedded in the spacing space.

[0013] In the cup cover of the above-mentioned fluid supply cup, a ridge one is arranged on the inner wall of the barrel-shaped wall, and the ridge one protrudes in the direction of the axis of the liquid inlet. A mounting guide surface is formed between the ridge one and the inner wall of the barrel-shaped wall of the liquid inlet, and the contour edge of the skeleton forms an interference fit along the mounting guide surface through the ridge one.

[0014] In the cup cover of the above-mentioned fluid supply cup, a plurality of protrusions are provided on the inner wall of the barrel-shaped wall, and the plurality of protrusions are arranged on the same circumferential line. The inner wall of the barrel-shaped wall between the circumferential line and the liquid inlet forms a mounting guide surface, and the contour edge of the skeleton forms an interference fit along the mounting guide surface through the protrusions.

[0015] In the cup cover of the above-mentioned fluid supply cup, a second ridge is arranged on the skeleton contour, a groove is arranged at the corresponding position of the inner wall of the barrel-shaped wall, and the inner wall of the barrel-shaped wall between the groove and the liquid inlet forms an installation guide surface, and the second ridge is embedded in the groove along the installation guide surface to form a snap-fit ​​fit.

[0016] In the above-mentioned cup cover of the fluid supply cup, a filter screen is arranged on the annular structure, and the filter screen covers the inner peripheral area surrounded by the annular structure.

[0017] A cup cover for a fluid supply cup comprises a cover body with a liquid inlet at one end and a liquid outlet at the other end, the side wall of the cover body extending from the liquid inlet to the liquid outlet, the corresponding part of the liquid inlet being used to connect with the cup body of the fluid supply cup, the side wall extending at the liquid inlet to form a barrel-shaped wall, a filter being arranged on the cup cover; an annular structure which can serve as a base for gluing or pressing a filter screen is arranged on the side wall, there is a spacing space between the annular structure and the barrel-shaped wall, the corresponding part of the skeleton of the filter filling the spacing space.

[0018] A fluid supplier comprises a spray cup and the cup cover as described above, wherein the spray cup comprises an inner liner and a rigid outer cup, wherein the inner liner is received in the rigid outer cup, wherein a plurality of locking slots are arranged on the cup mouth of the rigid outer cup, wherein a plurality of snap-fit ​​elements are correspondingly arranged on the outer edge of the cover body, wherein the barrel-shaped wall extends into the inner liner to form a closure, and wherein the snap-fit ​​elements can be introduced into the corresponding locking slots to connect the rigid outer cup to the cover body.

[0019] Compared with the prior art, the cup cover and fluid supplier of the fluid supply cup have the following beneficial effects:

[0020] 1. Setting the filter in the area surrounded by the barrel-shaped wall ensures the maximum filtering area, which is conducive to increasing the amount of filtered liquid per unit time and ensuring sufficient supply of spray paint to optimize spraying efficiency and effect. At the same time, the side wall can maintain a simple and smooth surface structure, simplify the step-by-step mold opening steps, and avoid shrinkage problems during the injection molding process. In addition, the simple side wall reduces the weight of the cover, saves materials, and reduces production costs. In addition, the smooth inner wall of the side wall is conducive to the smooth outflow of the paint, promotes the falling speed of the paint, and is beneficial to the spraying efficiency. On the other hand, the inner wall of the barrel wall provides sufficient introduction stroke, which makes it easy for users to apply stable force when installing the filter, ensuring that the filter is installed quickly, conveniently and accurately, and optimizing the assembly feel.

[0021] 2. Arrange a flow diversion direction perpendicular to the filtration area on the liquid inlet side of the filter to ensure that the maximum gravity decomposition force is obtained along the flow diversion direction under the inverted liquid supply state. Under the premise that the filter blocks large particles, the remaining liquid paint can overcome the resistance of the filter and pass through smoothly, and the liquid paint passing through the filter still maintains a certain flow rate, thereby ensuring the liquid supply volume and speed; thereby, effective impurity filtration can be achieved, and the filtration resistance can be prevented from affecting the pass rate and flow rate of the paint, avoiding the problem of paint being retained and hung on the net due to insufficient power, which in turn causes the mesh to be blocked and reduces the flow rate and flow rate. At the same time, the service life of the filter is extended, and the waste and pollution caused by the retention of paint can be reduced.

[0022] 3. Since the press-mesh method requires the setting of a convex rib structure, a space is bound to be formed between the convex rib structure and the inner wall of the cover. When the cover is inverted to supply liquid, the paint flows to the space and causes retention. The filter skeleton is used to fit into the space for sealing and filling. The paint storage space is eliminated by filling the space to prevent waste and pollution caused by paint storage. In addition, the filter is axially positioned by fitting the groove space with the skeleton, and the annular structure forms an inner ring support for the filter, ensuring the installation and fixation of the filter and preventing the filter from deformation, providing a comprehensive and stable filtering effect.

[0023] 4. A variety of snap-on methods are used to achieve detachable connection between the filter and the cover, which expands the flexibility and implementation plan of assembly. A disassembly force component (pull tab) is further added to make the disassembly operation simple and convenient, greatly improve the disassembly efficiency, and optimize the user's disassembly experience.

[0024] 5. Provide a variety of optional installation and filtering methods, including pressed filter screens, assembled filters, and the combination of the two, to meet different customer needs, increase application flexibility and variability, and at the same time enrich the use of the cover, increase the utilization rate of the cover, reduce scrapping costs, expand the application scope of the market, and increase competitiveness among similar products.

[0025] In short, the above beneficial effects not only improve the performance and user experience of the product, but also provide new ideas for the filter design of the spray cup in terms of paint circulation effect, and promote technological progress in related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall three-dimensional structural diagram of the first embodiment of the present invention.

[0027] Figure 2 It is a cross-sectional three-dimensional structural diagram of the first embodiment of the present invention.

[0028] Figure 3 It is a partial cross-sectional enlarged structural diagram of the first embodiment of the present invention.

[0029] Figure 4 It is an overall three-dimensional structural diagram of the cover body in the first embodiment of the present invention.

[0030] Figure 5 It is a cross-sectional three-dimensional structural diagram of the cover body in the first embodiment of the present invention.

[0031] Figure 6 It is an overall three-dimensional structural diagram of the second embodiment of the present invention.

[0032] Figure 7 It is a cross-sectional three-dimensional structural diagram of a second embodiment of the present invention.

[0033] Figure 8 It is a partial cross-sectional enlarged structural diagram of the second embodiment of the present invention.

[0034] Fig. 9 It is an overall three-dimensional structural diagram of the cover body in the second embodiment of the present invention.

[0035] Fig.10 It is an overall three-dimensional structural diagram of the third embodiment of the present invention.

[0036] Fig.11 It is a sectional three-dimensional structural diagram of a third embodiment of the present invention.

[0037] Fig.12 It is a partial cross-sectional enlarged structural diagram of the third embodiment of the present invention.

[0038] Fig.13 It is a cross-sectional three-dimensional structural diagram of a cover body in a third embodiment of the present invention.

[0039] Fig.14 It is the overall three-dimensional structure diagram of the filter in the present invention.

[0040] Fig.15 This is a structural diagram of the fluid supply device in use.

[0041] In the figure, 1, cover body; 1a, liquid outlet; 1b, side wall; 1c, barrel wall; 1d, liquid inlet; 2, filter; 2a, frame; 2b, annular boss; 2c, pull tab; 2d, filter screen; 3, annular structure; 4, spacing space; 5, installation guide surface; 6, convex ridge 1; 7, convex block; 8, convex ridge 2; 9, groove; 10, reinforcing rib; 11, rigid outer cup; 12, spray gun;

[0042] F1, parallel diversion direction; F1' / F1", inclined diversion direction. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] like Figures 1 to 14As shown, the cup cover of the fluid supply cup comprises a cover body 1 with a liquid inlet 1d at one end and a liquid outlet 1a at the other end. The side wall of the cover body 1 extends from the liquid inlet 1d to the liquid outlet 1a, and the corresponding part of the liquid inlet 1d is used to connect with the cup body of the fluid supply cup. The side wall 1b extends at the liquid inlet 1d to form a barrel-shaped wall 1c, and the extension surface of the barrel-shaped wall 1c is parallel to the axis of the liquid inlet 1d, forming a parallel diversion direction; the extension surface of the side wall 1b between the liquid inlet 1d and the liquid outlet 1a is arranged at an angle to the axis of the liquid outlet 1a, and the extension surface of the side wall 1b forms an inclined diversion direction. A filter 2 is arranged on the cup cover. On the liquid inlet side of the filter 2, the parallel diversion direction is perpendicular to the filtering area of ​​the filter 2, and on the liquid outlet side of the filter 2, the inclined diversion direction forms an angle with the filtering area of ​​the filter 2.

[0045] The side wall 1b may be a conical structure or a dome structure. The extended surface of the conical structure is the tapered surface, and the extended surface of the dome structure is the plane where the tangent line of any point on the arc wall is located.

[0046] The filter 2 is arranged in the corresponding area of ​​the barrel wall 1c, rather than in the corresponding area of ​​the side wall 1b, so that the side wall 1b maintains a conical wall surface with a consistent slope and a smooth transition, avoiding the need for a step structure to achieve the installation of the filter 2, making the structure of the side wall 1b relatively simple, eliminating the step-by-step mold opening operation required for a complex structure, thereby improving the surface shrinkage problem; at the same time, the smooth inner wall of the side wall 1b is conducive to the collection and diversion effect of the paint, promoting the output speed of the paint, and facilitating the spraying efficiency; in addition, the simple structure of the cover body 1 reduces the mold development cost, while reducing the overall weight of the cover body 1, saving material costs. The large mouth of the side wall 1b is the position of the maximum diameter, and the remaining positions are all smaller than the large mouth diameter. The diameter of the barrel wall 1c is equal to the large mouth diameter of the side wall 1b. The filter 2 is arranged in the corresponding area of ​​the barrel wall 1c, so that the filtration area of ​​the filter 2 is increased to the maximum, thereby increasing the amount of filtered liquid per unit time, ensuring sufficient supply of spray paint, and optimizing the spraying efficiency and effect.

[0047] Preferably, an annular structure 3 that can serve as a base for gluing or pressing the filter screen is arranged on the side wall 1b, and the annular structure 3 is any one of an annular rib, an annular platform or an annular pressing area.

[0048] The annular rib is a raised rib, and the upper end surface of the annular rib can be ridge-shaped. The filter screen can be pressed onto the annular rib by ultrasonic waves or the like, or can be directly adhered to the annular rib by adhesives. The outer wall of the annular rib is connected to the barrel wall 1c through the side wall 1b, and the annular cavity formed is the spacing space 4.

[0049] The annular platform has a plane parallel to the liquid inlet 1d, that is, the annular platform is connected to the side wall 1b through the inner side wall, and the outer edge of the plane of the annular platform is connected to the barrel wall 1c. The filter screen can be pressed on the plane by ultrasound or the like, or the filter screen can be directly adhered to the plane by an adhesive. The distance formed by the plane between the inner peripheral edge of the annular platform and the barrel wall 1c is the spacing space 4. After the filter screen is pressed, there is a certain distance between the edge of the filter screen and the barrel wall 1c, and this distance can also be considered as the spacing space 4.

[0050] The side wall 1b is a smooth surface, and an annular pressing area is set on the smooth surface according to the contour of the filter screen, that is, the annular pressing area is not a fixed structure, and filters of different specifications can be directly fixed on the side wall 1b by ultrasonic waves, bonding, etc. to form an annular connection part. After the filter screen is pressed in the side wall 1b, a height difference is formed between the edge of the filter screen and the barrel wall 1c, and the annular space formed by the height difference can also be considered as the spacing space 4.

[0051] The following is a specific description using an annular convex rib as an example. Of course, the user can also change to an annular platform, annular pressing area, and other methods as needed, which will not be described in detail here.

[0052] A spacing space 4 is formed between the annular structure 3 and the inner wall of the barrel-shaped wall 1c. The filter 2 includes a skeleton 2a and a filter screen 2d. A detachable positioning structure, i.e., a card net method, is arranged between the skeleton 2a and the spacing space 4. The corresponding part of the skeleton 2a is embedded in the spacing space 4 to form a filled state, and the positioning structure forms axial fixation.

[0053] Preferably, the frame 2a is a ring-shaped frame, and the filter 2d is arranged in a tensioned state inside the frame; a side of the frame has an annular boss 2b that matches the shape of the space, and the annular boss 2b is embedded in the space 4. The annular boss 2b and the space 4 are designed to have the same shape and specifications. After installation, the annular boss 2b fills the space 4 completely, and the outer peripheral contour of the frame fits the inner wall of the barrel wall 1c, thereby completely eliminating the installation gap and preventing paint from entering the space 4 and being retained.

[0054] like Figures 1 to 5 As shown, a specific implementation is that the positioning structure includes a ridge 6 arranged on the inner wall of the barrel wall 1c, the ridge 6 protrudes in the direction of the axis of the liquid inlet 1d, that is, the ridge 6 is perpendicular to the axis of the liquid inlet 1d, and the inner wall of the barrel wall 1c between the ridge 6 and the liquid inlet 1d forms a mounting guide surface 5, and the contour edge of the skeleton 2a forms an interference fit along the mounting guide surface 5 through the ridge 6.

[0055] The barrel-shaped wall 1c of the cover body 1 is used for assembly and connection of the spray cup, so the barrel-shaped wall 1c needs to have a certain height to form an assembly matching surface. At the same time, the height of the barrel-shaped wall 1c creates a sufficiently long introduction stroke for the installation introduction surface 5, providing stability for the frame 2a of the filter 2 during the introduction and installation process, ensuring that the installation is fast, convenient and accurate. During assembly, the frame 2a is inserted into the inner side of the convex ridge 6 to form a snap connection through the interference fit between the frame 2a and the convex ridge 6, and the annular boss 2b is just embedded in the spacing space 4 in a matching state.

[0056] like Figures 6 to 9 As shown, another specific embodiment is that the positioning structure includes a plurality of protrusions 7 arranged on the inner wall of the barrel-shaped wall 1c, and the plurality of protrusions 7 are arranged on the same circumferential line, and the circumferential line is perpendicular to the axis of the liquid inlet 1d. The inner wall of the barrel-shaped wall 1c between the circumferential line and the liquid inlet 1d forms a mounting lead-in surface 5, and the contour edge of the frame 2a forms an interference fit along the mounting lead-in surface 5 through the protrusions 7.

[0057] The barrel-shaped wall 1c of the cover body 1 is used for assembly and connection of the spray cup, so the barrel-shaped wall 1c needs to have a certain height to form an assembly mating surface. At the same time, the height of the barrel-shaped wall 1c creates a sufficiently long introduction stroke for the installation introduction surface 5, providing stability for the frame 2a of the filter 2 during the introduction and installation process, ensuring that the installation is fast, convenient and accurate. The protrusion 7 adopts a hemispherical structure, and the arc surface is used to achieve a smooth transition of the frame 2a during the disassembly and assembly process to facilitate operation. During assembly, the frame 2a is inserted into the inner side of the protrusions 7 to form a snap connection through the interference fit between the frame 2a and the protrusions 7, and the annular boss 2b is just embedded in the spacing space 4 in a matching state.

[0058] like Figures 10 to 13 As shown, another specific implementation is that the positioning structure includes two ridges 8 arranged on the outline of the skeleton 2a, a groove 9 is arranged at the corresponding position of the inner wall of the barrel wall 1c, and the inner wall of the barrel wall 1c between the groove 9 and the liquid inlet 1d forms an installation guide surface 5, and the two ridges 8 are embedded in the groove 9 along the installation guide surface 5 to form a snap-fit ​​fit.

[0059] The barrel-shaped wall 1c of the cover body 1 is used for assembly and connection of the spray cup, so the barrel-shaped wall 1c needs to have a certain height to form an assembly mating surface. At the same time, the height of the barrel-shaped wall 1c creates a sufficiently long introduction stroke for the installation introduction surface 5, providing stability for the frame 2a of the filter 2 during the introduction and installation process, ensuring that the installation is fast, convenient and accurate. The convex ridge 8 has an arc surface, and the groove 9 has an arc groove wall. The arc surface cooperates to achieve a smooth transition of the frame 2a during the disassembly and assembly process, so as to facilitate operation. During assembly, the convex ridge 8 and the inner wall of the barrel-shaped wall 1c are interferingly fitted into the groove 9 to form a snap connection, and at the same time, the annular boss 2b is just in a matching state and embedded in the spacing space 4.

[0060] Another specific implementation is that the positioning structure includes a ridge three arranged on the outer side surface of the annular rib, the ridge three protrudes in the direction away from the axis of the liquid inlet 1d, a groove is arranged at the corresponding position of the inner side surface of the annular boss 2b, the inner wall of the barrel wall 1c forms an installation guide surface 5, the contour edge of the skeleton 2a enters the spacing space 4 along the installation guide surface 5, and the inner side surface of the annular boss 2b forms an interference fit through the ridge three until the ridge three is embedded in the groove to form a snap fit.

[0061] The barrel-shaped wall 1c of the cover body 1 is used for assembling and connecting the spray cup, so the barrel-shaped wall 1c needs to have a certain height to form an assembly mating surface. At the same time, the height of the barrel-shaped wall 1c creates a sufficiently long introduction stroke for the installation introduction surface 5, providing stability for the frame 2a of the filter 2 during the introduction and installation process, ensuring that the installation is fast, convenient and accurate. The convex ridge 3 has an arc surface, and the groove has an arc groove wall. The cooperation of the arc surface realizes a smooth transition of the frame 2a during the disassembly and assembly process, so as to facilitate the operation. During assembly, the convex ridge 3 is firstly interference-fitted with the inner side of the annular boss 2b until the convex ridge 3 enters the groove to form a snap connection, and at the same time, the annular boss 2b is just embedded in the spacing space 4 in a matching state.

[0062] like Fig.14 As shown, a further optimization scheme is that a pull tab 2c is provided on the frame 2a, and the pull tab 2c includes a connecting section connected to the frame 2a, and the end of the connecting section is connected to the hand-held part. The frame 2a and the pull tab 2c can be integrally formed by injection molding, and the thickness of the connecting section is slightly thin and the width is slightly narrow to form a soft characteristic. The hand-held part usually adopts a round piece or an oval piece to facilitate finger pinching. When the filter 2 needs to be disassembled after installation and use, it is only necessary to pinch the pull tab 2c and pull it toward the outside of the liquid inlet 1d, and the filter 2 can be removed by overcoming the resistance of the positioning structure through the frame 2a. The removal method is simple and easy, and the disassembly and assembly efficiency is high.

[0063] Another specific implementation is that a filter screen is arranged on the annular structure 3, and the filter screen covers the inner peripheral area surrounded by the annular structure 3. The filter screen can be fixed to the annular structure 3 by any method such as hot melting, ultrasonic wave, mechanical pressing, bonding, etc. The filter screen is combined by hot melting, ultrasonic wave, mechanical pressing, etc., that is, the pressing method can reduce the height of the annular convex rib, so that the filter screen is flush with the inner wall of the side wall 1b after being fixed.

[0064] The filter screen and the filter 2 can both be used separately to filter large particles in the paint. The filter screen and the filter 2 can also be used in combination to form a double-layer filtering effect. When used in combination, the filter screen is first fixed on the annular structure 3, and then the filter 2 is clamped in the spacing space 4, that is, the filter screen is located on the inside and the filter 2 is located on the outside, so that the setting of the filter screen does not hinder the removal and replacement of the filter 2.

[0065] like Figure 4 , 5As shown in FIGS. 9 and 13, a further optimized solution is that a plurality of reinforcing ribs 10 are arranged on the inner wall of the side wall 1b, one end of the reinforcing rib 10 is connected to the annular convex rib or the annular platform, and the other end of the reinforcing rib 10 extends toward the center of the liquid outlet 1a. The reinforcing ribs 10 are used to enhance the support strength of the annular convex rib or the annular platform, thereby ensuring the stability of the annular convex rib or the annular platform in fixing the filter screen, and at the same time ensuring the stability of the frame 2a of the filter 2 and the spacing space 4, further ensuring the effect of effective filtering, and preventing the paint storage gap caused by extrusion deformation.

[0066] like Figures 1 to 14 As shown, another specific embodiment is a cup cover of a fluid supply cup, comprising a cover body 1 with a liquid inlet 1d at one end and a liquid outlet 1a at the other end, a side wall 1b of the cover body 1 extending from the liquid inlet 1d to the liquid outlet 1a, a corresponding portion of the liquid inlet 1d is used to connect with the cup body of the fluid supply cup, the side wall 1b extends at the liquid inlet 1d to form a barrel-shaped wall 1c, a filter 2 is arranged on the cup cover; an annular structure 3 is arranged on the side wall 1b, the annular structure 3 can be used as a base for pasting or pressing the filter net, there is a spacing space 4 between the annular structure 3 and the barrel-shaped wall 1c, and the corresponding portion of the skeleton 2a of the filter 2 fills the spacing space 4. This part is a re-combination of the technical features of the above scheme, and the corresponding technical effect is similar to the above scheme, so it will not be repeated here.

[0067] like Fig.15 As shown, another specific embodiment is a fluid supplier, including a spray cup and the above-mentioned cup cover, the spray cup includes an inner liner and a rigid outer cup 11, the inner liner is received in the rigid outer cup 11, a plurality of locking slots are arranged on the cup mouth of the rigid outer cup 11, a plurality of snap-fit ​​elements are arranged on the outer edge of the cover body 1, the barrel-shaped wall 1c extends into the inner liner to form a closure, and the snap-fit ​​elements can be introduced into the corresponding locking slots to connect the rigid outer cup 11 with the cover body 1. Here, the assembly structure of the cover body 1 and the rigid outer cup 11 may not be limited, as long as the cover body 1 can achieve a matching closure with the rigid outer cup 11, it can be used as a set.

[0068] The filter 2 is arranged in the corresponding area of ​​the barrel wall 1c rather than in the corresponding area of ​​the side wall 1b, so that the filter 2 and the liquid inlet 1d are completely connected by the barrel wall 1c, and the filter 2 and the liquid outlet 1a are mostly connected by the side wall 1b.

[0069] The liquid inlet 1d of the cup cover is assembled with the spray cup, and then the liquid outlet 1a of the cup cover is assembled with the spray gun 12. In the normal painting operation, the cup cover and the spray cup are in a vertical inverted or slightly tilted inverted state. The paint in the spray cup passes through the filter 2 under the action of its own gravity, and the larger particles in the paint are filtered out, and then enters the spray gun 12 through the liquid outlet 1a for spraying. The filter 2 is set to filter and has a certain blocking effect on the paint. The force value of the paint passing through the filter area is equal to the decomposition force of the paint gravity in the diversion direction. The self-gravity of the paint is constant, and the direction of gravity is kept vertically downward. Because the spray cup and the barrel wall 1c are straight cylinder structures with the same diameter, under the guidance of the straight cylinder wall, the parallel diversion direction F1 is perpendicular to the filtering area; because the side wall 1b is a gathering structure with a gradually decreasing diameter, under the guidance of the conical cylinder wall, the inclined diversion direction F1' / F1" forms an acute angle with the filtering area.

[0070] In the painting operation state, if the cup cover and the spray cup are in a vertical inverted state, the parallel flow direction F1 of the barrel wall 1c is consistent with the liquid gravity direction G, that is, the power of the liquid passing through the filter screen 2d is equal to the gravity. In this state, the filtration driving force reaches the maximum value. The inclined flow direction F1' / F1" of the side wall 1b has an inclined angle with the vertical direction. The decomposition force of gravity along the inclined flow direction serves as the flow power of the liquid. Obviously, this decomposition force is smaller than gravity.

[0071] In the painting operation state, if the cup cover and the spray cup are in a slightly tilted inverted state, the angle between the parallel flow guide direction F1 of the barrel wall 1c and the vertical direction is small, and the angle between the inclined flow guide direction F1' / F1" of the side wall 1b and the vertical direction is large. The smaller the angle, the greater the corresponding gravity decomposition force, and the larger the angle, the smaller the corresponding gravity decomposition force. That is, in the spraying state, the gravity decomposition force of the liquid obtained by the parallel flow guide direction F1 is greater than the gravity decomposition force of the liquid obtained by the inclined flow guide direction F1' / F1". Specifically, in the area surrounded by the barrel-shaped wall 1c, the parallel flow direction F1 is always perpendicular to the filtering area; while in the area surrounded by the side wall 1b, the inclined angle between the inclined flow direction F1' / F1" and the filtering area will change. The closer the area is to the inner surface of the side wall 1b, the smaller the inclination angle is, that is, the closer the inclined state is to the filtering surface. At this time, the gravity decomposition force obtained is the smallest, and gradually transitions to the center of the inner peripheral area of ​​the side wall 1b. The inclination angle gradually increases and only remains vertical on the center normal of the filtering surface, but the gravity decomposition forces obtained in the remaining areas are not the maximum value. Because the paint has a certain viscosity, the filter 2 is set in the area of ​​the barrel-shaped wall 1c, and the paint uses a larger gravity decomposition force to pass through the filtering area, thereby reducing or avoiding the paint from being retained in the filtering area to ensure the flow rate and prevent clogging.

[0072] On the other hand, through the cooperation of the filter 2 and the barrel wall 1c, the interval space 4 is filled to avoid the paint accumulation between the paint entering the filter 2 and the barrel wall 1c, thereby preventing waste and loss of paint; at the same time, after replacing the lining and paint, the paint remaining in the cup cover is prevented from contaminating the new paint and affecting the spraying quality and effect.

[0073] The combination of the above-mentioned setting area of ​​the filter 2 and the limitation of the matching mode generally realizes the purpose of smoothly outputting all the paint in the spray cup and preventing the paint from being wasted by remaining in the partition space 4, the filter 2d and other parts.

[0074] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention is described and described in detail in the drawings and the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by a person of ordinary skill. Specifically, the present invention encompasses additional embodiments having any combination of features from the above-mentioned different embodiments. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, i.e., there is no aforementioned characterization as "generally" or "substantially".

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A cup cover for a fluid supply cup, comprising a cover body with a liquid inlet at one end and a liquid outlet at the other end, wherein the side wall of the cover body extends from the liquid inlet to the liquid outlet, and the corresponding portion of the liquid inlet is used to connect with the cup body of the fluid supply cup, and the side wall extends at the liquid inlet to form a barrel-shaped wall, wherein the extension surface of the barrel-shaped wall is parallel to the axis of the liquid inlet, forming a parallel flow diversion direction; the extension surface of the side wall between the liquid inlet and the liquid outlet is arranged at an angle to the axis of the liquid outlet, and the extension surface of the side wall forms an inclined flow diversion direction, characterized in that: A filter is arranged on the cup cover. On the liquid inlet side of the filter, the parallel flow guide direction is perpendicular to the filter area of ​​the filter. On the liquid outlet side of the filter, the inclined flow guide direction forms an angle with the filter area of ​​the filter.

2. The cup cover of the fluid supply cup according to claim 1, characterized in that: The side wall is provided with an annular structure which can be used as a base for gluing or pressing the filter screen. There is a spacing space between the annular structure and the barrel-shaped wall, and the corresponding part of the frame of the filter fills the spacing space.

3. The cup cover of the fluid supply cup according to claim 2, characterized in that: The annular structure is any one of an annular rib, an annular platform or an annular pressing area.

4. The cup cover of the fluid supply cup according to claim 2, characterized in that: The frame is a ring-shaped frame, and a filter is arranged inside the frame; a side surface of the frame is provided with an annular boss that matches the shape of the spacing space, and the annular boss is embedded in the spacing space.

5. The cup cover of the fluid supply cup according to claim 2, characterized in that: A ridge 1 is arranged on the inner wall of the barrel-shaped wall, and the ridge 1 protrudes toward the axis of the liquid inlet. A mounting guide surface is formed between the ridge 1 and the inner wall of the barrel-shaped wall of the liquid inlet, and the contour edge of the skeleton forms an interference fit along the mounting guide surface through the ridge 1.

6. The cup cover of the fluid supply cup according to claim 2, characterized in that: A plurality of protrusions are arranged on the inner wall of the barrel-shaped wall, and the plurality of protrusions are arranged on the same circumference line. The inner wall of the barrel-shaped wall between the circumference line and the liquid inlet forms a mounting guide surface, and the contour edge of the skeleton forms an interference fit along the mounting guide surface through the protrusions.

7. The cup cover of the fluid supply cup according to claim 2, characterized in that: The skeleton profile is provided with a second ridge, the inner wall of the barrel wall is provided with a groove at a corresponding position, the inner wall of the barrel wall between the groove and the liquid inlet forms an installation guide surface, and the second ridge is embedded in the groove along the installation guide surface to form a snap fit.

8. The cup cover of the fluid supply cup according to claim 2, characterized in that: A filter screen is arranged on the annular structure, and the filter screen covers the inner peripheral area surrounded by the annular structure.

9. A cup cover for a fluid supply cup, comprising a cover body having a liquid inlet at one end and a liquid outlet at the other end, wherein a side wall of the cover body extends from the liquid inlet to the liquid outlet, a portion corresponding to the liquid inlet is used to connect with the cup body of the fluid supply cup, and the side wall extends at the liquid inlet to form a barrel-shaped wall, characterized in that: A filter is arranged on the cup cover; an annular structure which can serve as a base for gluing or pressing the filter net is arranged on the side wall, and there is a spacing space between the annular structure and the barrel-shaped wall, and the corresponding part of the skeleton of the filter fills the spacing space.

10. A fluid supply device, comprising a spray cup, characterized in that: And a cup cover as claimed in any one of claims 1 to 9, wherein the spray cup comprises an inner liner and a rigid outer cup, the inner liner is received in the rigid outer cup, a plurality of locking slots are arranged on the cup mouth of the rigid outer cup, a plurality of snap-fit ​​elements are correspondingly arranged on the outer edge of the cover body, the barrel-shaped wall extends into the inner liner to form a closure, and the snap-fit ​​elements can be introduced into the corresponding locking slots to connect the rigid outer cup to the cover body.

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