Fluid supply inner cup and spray cup

Abstract

The invention provides a fluid supply inner cup and a spray cup, which comprise a flexible lining, one end of the flexible lining is provided with an opening with a flange, the other end of the flexible lining is provided with a sealing bottom, and a cup wall is connected between the opening and the sealing bottom. When one flexible lining and the other flexible lining are in relative movement of nesting or separation, a contact gap is generated between the rough area of the one flexible lining and the inner surface of the cup wall of the other flexible lining through rough friction. The rough lines are machined on the outer surface of the soft thin cup, rough friction is formed through the concave-convex characteristics of the lines, the ventilation capacity and the supporting capacity are further improved, and meanwhile the overall collapse effect of the soft thin cup is not affected. The rough area of the flexible lining and the scale area of the outer cup are arranged in a staggered mode, after the flexible lining and the outer cup are assembled, interference of the rough area on scale reading is avoided, it is guaranteed that the scales are clear and readable, and accurate measurement of a user on the liquid material volume is not affected.

Description

Technical Field

[0001] The present invention belongs to the technical field of containers, and relates to a fluid reservoir for a spray gun, in particular to a fluid supply inner cup and a spray cup. Background Art

[0002] The spray gun mainly atomizes the paint by pneumatic means for spraying, so it is necessary to supply paint to the spray gun. Currently, a relatively common method is to connect a paint supply cup to the spray gun. By using this method, it is possible to ensure that the supply cup and the spray gun move simultaneously, and the paint is continuously pressed into the spray gun by gravity, and then atomized by compressed gas and sprayed out.

[0003] Currently, the supply cup is usually composed of a rigid outer cup, a lining, and a cup lid. It is necessary to cover the cup lid and the lining, then place the lining in the rigid outer cup, and finally seal the rigid outer cup with the cup lid and assemble it into an integral structure by using locking methods such as threads. The lining is a disposable product, and liquid paint is filled therein. As the paint flows out, the lining collapses accordingly, reducing its volume, so as to facilitate the smooth and continuous pressing of the paint into the spray gun. Therefore, the lining adopts a thin-walled plastic cup body with a uniform wall thickness, and this cup body has a soft characteristic, so as to better realize the uniform collapse of the lining and smoothly extrude the paint out of the lining by using the external air pressure. If the wall thickness of the lining cup is inconsistent or there is a local strengthening structure, areas that are easy to collapse and areas that are not easy to collapse will be formed. As a result, the lining cannot collapse synchronously corresponding to the discharged paint, and even the phenomenon of incomplete collapse occurs, resulting in too large a vacuum space between the lining and the paint, which is not conducive to the smooth pressing of the paint into the spray gun under the action of gravity.

[0004] The linings are usually stacked and stored in sequence, and the storage method can be manual operation or mechanical operation. Manual operation requires a large amount of labor and working hours, resulting in high costs and low efficiency. Mechanical operation usually places the linings on a vibrating cup stacking machine, stacks the cup bodies one by one, and tightly nests the adjacent cup bodies through the vibration force.

[0005] The existing linings are thin-walled products and all adopt smooth wall surfaces. During the nesting process of adjacent linings, smooth friction will also be formed between the smooth cup walls. Smooth friction will cause electrostatic attraction (Coulomb force), thus hindering the relative movement between the two cup walls. That is to say, the two cup walls are prone to sticking together. Moreover, the molecules on the smooth surface will attract each other through van der Waals forces. Although this force is small, it still exists and may affect whether the two objects are easy to move relative to each other (nest or separate), or whether they can stay together without external force.

[0006] On the other hand, when two inner liners are nested, as the nesting depth increases, the air between the bottoms of the two cups is continuously compressed, and the air needs to be discharged in time to stack them in place as soon as possible. However, since it is easy for the two smooth walls to fit tightly, it is difficult to maintain a uniform and unobstructed exhaust structure. The pressure in the compressed space is greater than the external air pressure, resulting in a non-compliant nesting depth during the nesting process of the inner liner. Conversely, when the two nested inner liners are separated, as the distance between the two inner liners is lengthened, the volume between the bottoms of the two cups is continuously increased, and external air needs to be replenished in time to achieve air pressure balance. However, due to the tight fit between the two smooth walls, it is difficult to maintain a uniform and unobstructed intake structure. The pressure in the enlarged space is less than the external air pressure, increasing the difficulty of separating the two inner liners and causing multiple cups to be easily carried out when taking out a single cup.

[0007] In summary, when the smooth walls of the two cups move relative to each other, among the factors that hinder the movement caused by the relatively close smooth friction, the air pressure difference formed in the nearly sealed space is the main hindering force, while the effects of Coulomb force and van der Waals force are relatively small, but they still exist under specific conditions.

[0008] When using a vibrating cup stacker to automatically stack cups, the cup body located inside the embedding moves gradually and alternately downward under the left and right shaking. Since the two are in contact with a smooth surface and the sliding friction is small, with each vibration, the inner liner slips on the wall surface and one side undergoes a relatively long downward displacement, resulting in a large angle between the central axes of the two inner liners, causing the outer wall of the embedded inner liner to hit the edge of the opening of the inner liner of the outer sleeve. Under continuous swinging and hitting, serious scratches are caused on the outer wall of the inner liner, affecting the surface quality of the product. On the other hand, the greater the coaxiality deviation between the two inner liners, the greater the contact area between the two inner liners, that is, the ventilation interval between the two is reduced and uneven, directly affecting the exhaust effect of the compressed space at the bottom, resulting in problems such as insufficient nesting depth and low efficiency.

[0009] On the other hand, existing disposable cups usually have steps at the bottom of the inner wall of the cup to provide bottom edge limit support for the stacked cup bodies to prevent the two cups from being nested too deeply and difficult to separate. However, these steps form obstructive structures such as convex edges and bends on the straight wall surface, resulting in unsmooth ventilation between the two cup bodies, making it difficult to discharge the air at the bottom during the nesting process, leading to a large pressure hindrance during cup stacking and even the problem that the cup body cannot descend in place. Summary of the Invention

[0010] The object of the present invention is to propose a fluid supply inner cup and a spraying cup in view of the above problems existing in the prior art.

[0011] The objective of the present invention can be achieved through the following technical solutions: a fluid supply inner cup, comprising a flexible liner, one end of the flexible liner is an opening with a flange, and the other end is arranged as a bottom seal, a cup wall is connected between the opening and the bottom seal, a rough area is arranged on the outer surface of the cup wall, and when one flexible liner and another flexible liner are in relative movement during nesting or separation, the rough area of ​​one flexible liner and the inner surface of the cup wall of the other flexible liner generate a contact gap through rough friction.

[0012] Preferably, a plurality of flexible liners are nested together in sequence, and an air storage space is formed between the bottom covers of adjacent flexible liners.

[0013] Preferably, adjacent flexible liners generate relative movement, and an air flow path is formed between the cup walls of adjacent flexible liners. The contact gap and the air flow path form an annular gap, and the air storage space is connected to the outside through the annular gap.

[0014] Preferably, the rough area is arranged on the bottom ring portion where the cup wall connects to the bottom seal.

[0015] Preferably, the cup wall and the bottom cover are connected through an arc chamfer transition, and the bottom ring portion includes an annular area of ​​the cup wall close to the bottom cover, the arc chamfer, and an outer ring portion extending to the bottom cover.

[0016] Preferably, the rough area is arranged on the top ring portion of the cup wall close to the opening, and an outward expansion step is provided between the top ring portion and the opening.

[0017] Preferably, the rough area is a ring portion in the middle of the cup wall, and the edge of the ring portion is straight, wavy or sawtooth;

[0018] Alternatively, the rough area is in a spiral shape, and the spiral rough area extends from the bottom of the cup wall to the top;

[0019] Alternatively, the rough area is in the shape of vertical stripes, and the vertical stripe-shaped rough area extends linearly from the bottom to the top of the cup wall.

[0020] Preferably, the rough lines in the rough area are arranged continuously or discontinuously.

[0021] A spray cup comprises an outer cup and a flexible liner, wherein the flexible liner is placed in a cup body through a cup mouth of the outer cup, scales are arranged on the cup body of the outer cup, and a rough area on a cup wall of the flexible liner is arranged staggered with the scales.

[0022] Preferably, the scale has a lowest boundary and a highest boundary, and scale lines and scale values ​​are arranged between the lowest boundary and the highest boundary; the rough area located at the bottom circle part of the cup wall is lower than the lowest boundary, and / or the rough area located at the top circle part of the cup wall is higher than the highest boundary.

[0023] Preferably, a local area of ​​the cup body is provided with scales along the axial direction, a rough area and a smooth area are provided on the cup wall, and the scales overlap with the smooth area.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention processes rough textures on the outer surface of the soft thin cup, and forms rough friction through the concave-convex features of the textures, thereby further providing ventilation and supporting capabilities, while not affecting the overall collapse effect of the soft thin cup.

[0026] 1. During the vibration of automatic cup stacking, the swing amplitude is reduced through the support capacity, and the coaxiality of the two cups during the nesting process is relatively improved to maintain the annular gap between the two cups. The air layer in the annular gap protects the outer surface of the cup wall, effectively preventing the wall from being scratched due to strong impact during the nesting process, ensuring the appearance quality. At the same time, during the automatic nesting process, the coordination of coaxiality and contact gap realizes a uniform and smooth internal and external ventilation structure, so as to release the air pressure between the two cups, eliminate the obstruction of internal pressure, facilitate fast and accurate cup stacking, and improve work efficiency.

[0027] 2. When the two cups are separated, the contact gap is also used to achieve a uniform and smooth internal and external ventilation structure, so that the external air can smoothly enter between the two cups, eliminating the obstruction of external pressure, facilitating easy and quick extraction operations and avoiding multiple cups from sticking together.

[0028] 3. The arc-chamfered bottom ring of the cup body cooperates with the straight cup wall to construct a smooth transition and straight air path, so as to ensure smooth gas flow during exhaust and inhalation, avoid local air flow blockage, optimize the ventilation effect, and make the stacking and separation of cups more stable and smooth.

[0029] 4. The rough area of ​​the flexible lining and the scale area of ​​the outer cup are staggered. After the two are assembled, the interference of the rough area on the scale reading is avoided, the scale is clear and readable, and the user's accurate measurement of the liquid volume is not affected.

[0030] 5. The design of the overlap between the flexible liner and the rim of the outer cup can realize the axial positioning of the flexible liner in the outer cup, which is helpful for fast and stable cup stacking operation under the action of the vibrating cup stacking machine, while ensuring the layout of the rough area and the scale area, further ensuring the clarity and readability of the scale.

[0031] 6. The shape and distribution design of the rough area are flexible and diverse, such as ring, straight strip, wave, spiral, etc., which can be customized according to actual needs. Different design forms can meet different usage scenarios and customer needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Structural diagram of the rough area in the inner cup of this fluid supply being arranged in the bottom ring part.

[0033] Figure 2 Structural diagram of the rough area in the inner cup of this fluid supply being arranged in the top ring part.

[0034] Figure 3 Structural diagram of the rough area in the inner cup of this fluid supply being arranged in the bottom ring part and the top ring part.

[0035] Figure 4 Structural diagram of two flexible linings of the inner cup of this fluid supply being nested.

[0036] Figure 5 Structural diagram of the rough area in the inner cup of this fluid supply being wavy in the middle.

[0037] Figure 6 Structural diagram of the rough area in the inner cup of this fluid supply being spiral-shaped.

[0038] Figure 7 Structural diagram of the rough area in the inner cup of this fluid supply being vertical strip-shaped.

[0039] Figure 8 Structural diagram of the rough area in the inner cup of this fluid supply being intermittently arranged in the bottom ring part and the top ring part.

[0040] Figure 9 Structural diagram of the rough area in the inner cup of this fluid supply being intermittently arranged in a spiral shape.

[0041] Figure 10 Structural diagram of the rough area in the inner cup of this fluid supply being intermittently arranged in a wavy shape.

[0042] Figure 11 Structural diagram of this spray cup.

[0043] In the figure, 1. Flexible lining; 2. Flange; 3. Outer expansion step; 4. Rough area; 5. Smooth area; 6. Bottom ring part; 7. Arc chamfer; 8. Top ring part; 9. Gas storage space; 10. Contact gap; 11. Circulation gas path; 12. Annular gap; 13. Outer cup; 14. Scale. Detailed implementation mode

[0044] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0045] As Figures 1 to 4As shown, the fluid supply inner cup includes a flexible liner 1, one end of the flexible liner 1 is an opening with a flange 2, and the other end is set as a bottom seal, and a cup wall is connected between the opening and the bottom seal. The cup wall of the flexible liner 1 can be a round straight cylinder or a conical cylinder, but in order to facilitate the sequential nesting of multiple flexible liners 1, a conical cylinder shape with a slightly reduced diameter from the opening to the bottom seal is usually adopted.

[0046] like Figure 4 As shown, several flexible liners 1 are nested together in sequence, and an air storage space 9 is formed between the bottom covers of adjacent flexible liners 1. Relative movement occurs between adjacent flexible liners 1, and an air flow path 11 is formed between the cup walls of adjacent flexible liners 1. Specifically, a part of the outer wall of one flexible liner 1 and a corresponding part of the inner wall of another flexible liner 1 form an air flow path 11. The inner surface of the cup wall is a smooth surface, and the basic outer surface of the cup wall is a smooth surface. A rough area 4 with certain textures on the surface is formed on the local smooth outer surface through physical (sandblasting, grinding), chemical (corrosion) and other treatments.

[0047] In this embodiment, the rough area 4 is specifically manifested as a frosted surface. The core standard for the surface roughness of plastic parts is the national standard "GB / T 14234-1993". The flexible lining 1 is molded by mold injection molding, and the surface roughness of the corresponding part of the mold is the surface roughness of the rough area 4 on the flexible lining 1. The texture depth of the rough area 4 ranges from 15μ to 100μ, the groove angle ranges from 5.0° to 12°, and the smoothness ranges from 2.0° to 5.0°; the greater the texture depth, the greater the groove angle, and the smaller the smoothness, the more obvious the roughness of the rough area 4, and the larger the gap generated by its concave-convex structure. Specifically, the following groups of values ​​are used: 1. Minimum value: texture depth 15μ, groove angle 5.0°, smoothness 5.0°. 2. Intermediate value: texture depth 50μ, groove angle 8.0°, smoothness 3.0°. 3. Maximum value: texture depth 100μ, groove angle 12°, smoothness 2.0°. The specific values ​​adopted in this embodiment are: texture depth 90μ, groove angle 11°, smoothness 2.0°; this set of values ​​can form a contact gap 10 that is conducive to ventilation after the flexible liner 1 is nested.

[0048] The other smooth areas 5 on the outer surface of the cup wall, except for the rough area 4, form the above-mentioned ventilation passage 11. The wall thickness of the cup wall in the rough area 4 is the same as that of the other smooth areas 5 of the cup wall, and there may be an error of 0.01 mm - 0.1 mm in its thickness, but it will not affect the combined use of the inner cup and the outer cup 13. Since the thickness of the rough area 4 is the same as that of the smooth area 5, their collapse performances under the action of air pressure are basically the same; however, due to the concave-convex structure of the rough area 4, its strength is slightly greater than that of the smooth area 5. When nesting or separating, it can not only keep the two liners having a certain coaxiality, but also provide a certain support strength for the circular cup body to prevent the smooth area 5 from skewing or deforming excessively. The skewed or greatly deformed smooth area 5 will squeeze the ventilation passage 11 to cause local blockage, hindering uniform and smooth continuous ventilation.

[0049] Sliding friction refers to the resistance mutually exerted along the tangent direction of the contact surface during the relative sliding process when two substances are in contact. The magnitude of sliding friction is related to the roughness of the contact surface and the magnitude of the pressure. The greater the pressure and the rougher the contact surface of the object, the greater the sliding friction generated. Thus, the sliding friction between two smooth contact surfaces is specifically smooth friction, and the sliding friction between at least one rough contact surface is specifically rough friction.

[0050] During the relative movement of nesting or separating of the two flexible liners 1, the rough area 4 and the inner surface of the cup wall generate a contact gap 10 through rough friction. The contact gap 10 refers to the tiny void or distance existing between two contacting objects. Here, it can be understood that due to the unevenness of the rough area 4, the protruding parts make contact, while the recessed parts form voids, thus there is a gap while the two surfaces are in contact. That is, the greater the texture depth, the greater the groove angle, and the smaller the smoothness, the more obvious the roughness of the rough area 4, and the greater the gap generated by its concave-convex structure. The contact gap 10 and the ventilation passage 11 form an annular gap 12, and the gas storage space 9 is kept unblocked from the outside through the annular gap 12. The nested part of the cup wall is a straight wall surface from top to bottom, so the annular gap 12 is a straight channel from top to bottom. Under the support of the rough area 4, the nested flexible liner 1 maintains a certain coaxiality, ensuring to a certain extent the circumferential uniformity of the annular gap 12, and realizing a uniform, continuous and smooth ventilation effect between the gas storage space 9 and the outside during the exhaust and inhalation processes.

[0051] On the other hand, the vibration generated by the vibrating cup stacking machine promotes the mutual nesting of adjacent flexible liners 1. It frictions the inner surface of the cup wall through the rough area 4 and moves deeper, forming a protection space between the nested cup walls through the annular gap 12.

[0052] When using the vibrating cup stacker to automatically stack cups, the rough area 4 increases the sliding friction. During a single vibration, the displacement of one side of the inner cup body downward is small, so that the angle between the central axes of the two flexible linings 1 is small, that is, their coaxiality is relatively high, and a relatively uniform annular gap 12 is formed between them. This annular gap 12 provides a circumferential protection space, so that the inner cup wall does not touch the outer cup mouth, thus avoiding hitting the wall surface of the flexible lining 1 and preventing scratches from being generated, protecting the appearance of the product.

[0053] At the same time, in order to perform the nesting operation accurately and conveniently, during the nesting process, it is necessary to quickly discharge the gas volume in the gas storage space 9 to avoid excessive internal pressure causing difficulty in the downward movement of the flexible lining 1. By contacting the inner surface of the cup wall through the rough area 4, and the rough structure forms a certain degree of supporting effect, the coaxiality of the nesting of the two flexible linings 1 can be improved, so that there is a gap between the cup walls of the two flexible linings 1 and they cannot fit together, so as to ensure that the annular gap 12 is uniformly unobstructed in the circumferential direction. Thus, the air in the gas storage space 9 is compressed by the gravity of the cup body and discharged unobstructedly through the contact gap 10 of the rough area 4 and the air flow path 11, which can not only ensure the coaxiality of nesting, but also quickly reach the nesting depth.

[0054] On the other hand, for the separated and nested flexible linings 1, the two bottom seals are separated relatively to increase the volume of the gas storage space 9, and the rough area 4 rubs against the inner surface of the cup wall and gradually moves out, and the external air flows into the gas storage space 9 through the annular gap 12.

[0055] In order to perform the separation operation conveniently, during the separation process, it is necessary to quickly replenish the gas volume in the gas storage space 9 to avoid a vacuum inside and excessive external pressure causing difficulty in pulling out the flexible lining 1. By contacting the inner surface of the cup wall through the rough area 4, and the rough structure forms a certain degree of supporting effect, the coaxiality of the separation process of the two flexible linings 1 can be improved, so that there is a gap between the cup walls of the two flexible linings 1 and they cannot fit together, so as to ensure that the annular gap 12 is uniformly unobstructed in the circumferential direction. Thus, while the gas storage space 9 increases, the external air enters the gas storage space 9 unobstructedly through the air flow path 11 and the contact gap 10 of the rough area 4, ensuring that the two nested flexible linings 1 can be easily separated.

[0056] Preferably, as Figure 1 shown, the rough area 4 is arranged on the bottom ring part 6 where the cup wall is connected to the bottom seal. The cup wall and the bottom seal are transitionally connected through an arc chamfer 7. The bottom ring part 6 includes an annular area of the cup wall close to the bottom seal, the arc chamfer 7, and an outer ring part extending to the bottom seal. The annular area is part of the cup wall, specifically the bottom area, and the height of this annular area can be set according to requirements. The outer ring part is part of the bottom seal, and the width of this outer ring part can be set according to requirements.

[0057] It is pointed out in the literature "The Influence of Local Bending of Pipeline on Pneumatic Lifting Performance" (Classification Number: TD522; Document Code: A; Article Number: 0253 - 6099(2015)02 - 0033 - 05) that when there is a locally bent part in the lifting pipe, the pneumatic lifting performance will inevitably be reduced. That is, through experiments, it shows that if there are local bends or angular structures in the pipeline structure, the ventilation efficiency will surely be affected. In this solution, the bottom edge of the cup wall is designed in the shape of an arc chamfer 7, so that a smooth transition connection is formed between the gas storage space 9 and the annular gap 12, and combined with the straight channel formed by the annular gap 12, a ventilation structure with smooth lines is constructed to facilitate the rapid and continuous entry and exit of air into and out of the gas storage space 9.

[0058] Preferably, as Figure 2 shown, the rough area 4 is arranged on the top ring part 8 of the cup wall near the opening, and an outward - expanding step 3 is provided between the top ring part 8 and the opening. The diameter of the outward - expanding step 3 is slightly larger than the diameter of the cup wall. The outward - expanding step 3 has an annular table surface. When the flexible inner liner 1 is assembled with the outer cup 13, positioning and fitting are carried out through the structure of the annular table surface, flange 2 and the outer cup 13. When two flexible inner liners 1 are nested, a limiting fit is formed by the stacking of the annular table surface and the flange 2. In addition, the diameter of the outward - expanding step 3 is matched with the caliber of the cup lid. After the cup lid and the flexible inner liner 1 are closed, a sealing fit is formed between the outer wall of the cup lid caliber and the inner wall of the outward - expanding step 3.

[0059] As Figure 1 shown, the rough area 4 can be separately arranged on the bottom ring part 6, as Figure 2 shown, or can be separately arranged on the top ring part 8, as Figure 3 shown, or the rough area 4 can also be arranged on both the bottom ring part 6 and the top ring part 8. During the nesting and separation process, the rough area 4 on the bottom ring part 6 plays a main frictional role, basically participating in the whole process, playing a role in maintaining the coaxiality and contact gap 10; the rough area 4 on the top ring part 8 plays an auxiliary frictional role, acting during the short time when nesting is in place or starting to separate, playing a role in frictional contact and ensuring coaxiality when nesting is in place, and providing a ventilation gap when starting to separate. The design of arranging the rough area 4 on both the bottom ring part 6 and the top ring part 8 is the best solution, which can not only stack cups quickly under the action of a vibrating cup - stacking machine, but also protect the outer surface of the cup wall from being scratched.

[0060] The rough area 4 can also be set in other shapes and positions, and different - shaped rough areas 4 can be combined according to requirements.

[0061] For example, the rough area 4 is a ring part in the middle of the cup wall, and the edge of the ring part is straight, wavy (as Figure 5 shown) or serrated.

[0062] As Figure 6As shown, the rough area 4 is in a spiral shape, and the spiral rough area 4 extends from the bottom to the top of the cup wall.

[0063] like Figure 7 As shown, the rough area 4 is in the shape of vertical stripes, and the vertical stripe-shaped rough area 4 extends straightly from the bottom to the top of the cup wall.

[0064] The above are just examples of common shapes. In fact, other similar forms derived from these shapes may also be included. The specific shapes are not limited to the ones listed in this article.

[0065] The rough lines in the rough area 4 are arranged continuously or discontinuously (e.g. Figures 8 to 10 For example, the rough area 4 is roughly an annular area, such as Figures 1 to 3 As shown, the rough texture in the annular area can be arranged uniformly and continuously, such as Figure 8 As shown, it can also be arranged at intervals according to arc segments of a certain length. The boundary of the rough area 4 is usually a straight line, but it can also be set in other forms such as curves, wavy lines, and sawtooth lines. The rough texture can be a frosted texture, or a dot matrix of various shapes, or other forms such as wavy textures and vertical stripes.

[0066] like Figure 11 As shown, a spray cup includes an outer cup 13 and a flexible liner 1. The flexible liner 1 is inserted into the cup body from the cup mouth of the outer cup 13. A scale 14 is arranged on the cup body of the outer cup 13. The rough area 4 on the cup wall of the flexible liner 1 is staggered with the scale 14.

[0067] The outer cup 13 is a transparent rigid cup body, one end of the rigid cup body is the cup mouth, the other end is the cup bottom, and the cup bottom is provided with a hollow hole, through which air enters, and the air pressure causes the flexible lining 1 to collapse. The cup body of the rigid cup body is provided with a scale 14 and other marks by printing, engraving, etc.

[0068] The diameter of the cup mouth of the outer cup 13 is slightly larger than the diameter of the cup body, and an annular ridge is formed at the junction of the cup mouth and the cup body. An annular outer edge is set on the outer periphery of the cup mouth of the outer cup 13. After the flexible liner 1 is placed into the cup body, the annular table surface of the outward expansion step 3 of the flexible liner 1 overlaps the annular ridge, and the flange 2 of the flexible liner 1 overlaps the annular outer edge, thereby realizing the axial positioning of the flexible liner 1 in the outer cup 13.

[0069] The rough area 4 on the flexible liner 1 is arranged separately from the scale 14, with no or very little overlap. Therefore, after the paint is poured into the flexible liner 1, there is no rough area 4 in the display area of ​​the scale 14, which does not affect the accurate reading of the paint volume.

[0070] The arrangement of the rough area 4 and the scale 14 generally includes the following two methods:

[0071] First, the scale 14 has a lowest boundary and a highest boundary, and scale lines and scale values are arranged between the lowest boundary and the highest boundary; generally, the scale 14 is set around the middle area of the cup body, and the scale values are arranged in sequence from bottom to top. The lowest boundary and the highest boundary can be warned by engraving red lines.

[0072] The rough area 4 located at the bottom ring part 6 of the cup wall is lower than the lowest boundary, and / or the rough area 4 located at the top ring part 8 of the cup wall is higher than the highest boundary. The rough area 4 is designed to be below the lowest boundary and / or above the highest boundary, so that rough friction can be generated during cup nesting without affecting the clarity of the scale 14 area.

[0073] Second, the scale 14 is axially arranged in a local area of the cup body. Generally, the area of the scale 14 is small and only occupies a small part of the circumferential wall of the cup body, and the rest is blank. The rough area 4 and the smooth area 5 are arranged on the cup wall. For example, the rough area 4 in the shape of a straight strip, a wave or a sawtooth does not completely surround the cup wall, and a section of notch is reserved to form the smooth area 5; the rough area 4 in a spiral shape is provided with intermittent notches, and the smooth area 5 is formed through the intermittent notches; the interval area between the rough areas 4 in the shape of vertical strips forms the smooth area 5. The area of the smooth area 5 is not less than the area occupied by the scale 14. After the flexible inner liner 1 is placed into the outer cup 13, the scale 14 overlaps with the smooth area 5, so as not to affect the clarity of the scale 14 area.

[0074] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention has been described in detail in the drawings and the foregoing description, such description and description are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, those of ordinary skill in the art can make changes and modifications. Specifically, the present invention encompasses additional embodiments having any combination of features from the different embodiments described above. Regarding the use of the expressions "generally" or "substantially", this patent application should be understood as disclosing that the same fully meets these features and values, that is, without the foregoing being characterized 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 "mounted", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims

1. A fluid supply inner cup, comprising a flexible inner lining, one end of the flexible inner lining is an opening with a flange, the other end is provided with a sealed bottom, and a cup wall is connected between the opening and the sealed bottom, characterized in that, A rough area is arranged on the outer surface of the cup wall. When one flexible liner and another flexible liner move relative to each other during nesting or separation, the rough area of ​​one flexible liner and the inner surface of the cup wall of the other flexible liner generate a contact gap through rough friction.

2. The fluid supply inner cup according to claim 1, characterized in that, A plurality of flexible liners are nested together in sequence, and an air storage space is formed between the bottom covers of adjacent flexible liners.

3. The fluid supply inner cup according to claim 2, wherein Relative movement occurs between adjacent flexible liners, and air flow paths are formed between cup walls of adjacent flexible liners. The contact gap and the air flow path form an annular gap, and the air storage space is connected to the outside through the annular gap.

4. The fluid supply inner cup according to claim 1, characterized in that, The rough area is arranged at the bottom ring portion where the cup wall is connected to the bottom seal.

5. The fluid supply inner cup according to claim 4, wherein, The cup wall and the bottom cover are connected through a circular arc chamfer transition, and the bottom ring part includes an annular area of ​​the cup wall close to the bottom cover, the circular arc chamfer, and an outer ring part extending to the bottom cover.

6. The fluid supply inner cup according to claim 1 or 4, characterized in that, The rough area is arranged on the top ring part of the cup wall close to the opening, and an outward expansion step is arranged between the top ring part and the opening.

7. The fluid supply inner cup according to claim 1, characterized in that, The rough area is a ring portion in the middle of the cup wall, and the edge of the ring portion is straight, wavy or sawtooth; Alternatively, the rough area is in a spiral shape, and the spiral rough area extends from the bottom of the cup wall to the top; Alternatively, the rough area is in the shape of vertical stripes, and the vertical stripe-shaped rough area extends linearly from the bottom to the top of the cup wall.

8. The fluid supply inner cup according to claim 1, characterized in that, The rough lines in the rough area are arranged continuously or discontinuously.

9. A spray cup, comprising an outer cup and a flexible inner lining, wherein the flexible inner lining is placed into the cup body from the cup mouth of the outer cup, and is characterized in that, The cup body of the outer cup is provided with scales, and the rough areas on the cup wall of the flexible liner are arranged staggered with the scales.

10. The spray cup according to claim 9, characterized in that, The scale has a lowest boundary and a highest boundary, and scale lines and scale values ​​are arranged between the lowest boundary and the highest boundary; the rough area located at the bottom circle of the cup wall is lower than the lowest boundary, and / or the rough area located at the top circle of the cup wall is higher than the highest boundary.

11. The spray cup according to claim 9, characterized in that, A local area of ​​the cup body is provided with scales along the axial direction, a rough area and a smooth area are provided on the cup wall, and the scales overlap with the smooth area.

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