Fluid supply inner cup and spray cup

Abstract

The utility model 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. According to the soft thin cup, 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] This utility model belongs to the field of container technology and relates to a fluid storage device for a spray gun, particularly a fluid supply inner cup and a spray cup. Background Technology

[0002] The spray gun mainly uses pneumatics to atomize the paint before spraying. Therefore, it is necessary to supply paint to the spray gun. The most common method is to connect a paint supply cup to the spray gun. This method can 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 sprayed out after being atomized by compressed gas.

[0003] Currently, the spray gun typically consists of three parts: a rigid outer cup, an inner liner, and a lid. The lid and liner must be fitted together, the liner placed inside the rigid outer cup, and finally the lid is used to seal the outer cup, assembling it into a single unit using threads or other locking mechanisms. The liner is a disposable product filled with liquid paint. As the paint flows out, the liner collapses, reducing its volume to facilitate smooth and continuous pressure of the paint into the spray gun. Therefore, the liner uses a thin-walled plastic cup with uniform wall thickness. This cup's flexibility allows for better uniform collapse of the liner, enabling external air pressure to force the paint out. If the liner's wall thickness is inconsistent or has localized reinforcement, creating areas that collapse easily and areas that don't, the liner may not collapse synchronously with the discharged paint, or even collapse incompletely. This results in an excessively large vacuum space between the liner and the paint, hindering the smooth pressure of the paint into the spray gun under gravity.

[0004] The inner linings are typically stacked and stored sequentially, either manually or mechanically. Manual storage requires significant labor and time, resulting in high costs and low efficiency. Mechanical storage usually involves placing the inner linings on a vibrating cup stacking machine, stacking the cups one by one, and using vibration to tightly nest adjacent cups.

[0005] Existing liners are thin-walled products with smooth surfaces. During the nesting process of adjacent liners, the contact between the smooth cup walls creates smooth friction, which leads to electrostatic attraction (Coulomb force), thus hindering relative movement between the two cup walls. In other words, the two cup walls tend to stick together. Furthermore, the molecules on the smooth surface attract each other through van der Waals forces. Although this force is small, it still exists and can affect whether the two objects can easily move relative to each other (nesting or separating), or whether they can remain 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. This air needs to be expelled promptly to ensure proper stacking. However, because the two smooth walls tend to adhere tightly, it's difficult to maintain a uniform and unobstructed venting structure. This results in the pressure in the compressed space exceeding the external air pressure, causing the nesting depth to be insufficient during the nesting process. Conversely, when two nested inner liners are separated, as the distance between them increases, the volume between the bottoms of the two cups expands. External air needs to be added promptly to achieve pressure balance. However, the tight adhesion between the two smooth walls makes it difficult to maintain a uniform and unobstructed air intake structure. This results in the pressure in the increased space being lower than the external air pressure, increasing the difficulty of separating the two inner liners and making it easy to carry multiple cups out when removing a single cup.

[0007] In summary, when the smooth walls of the two cups move relative to each other, the air pressure difference formed by the near-sealed space is the main obstacle to movement due to the friction caused by the relatively close contact. The effects of Coulomb force and van der Waals force are relatively small, but they still exist under certain conditions.

[0008] When using a vibrating cup stacking machine for automatic cup stacking, the embedded cups gradually move downwards alternately as they sway from side to side. Because the two surfaces are in contact, the sliding friction is small. With each vibration, the inner liner slips on one side, causing a longer downward displacement. This creates a large angle between the central axes of the two inner liners, resulting in the outer wall of the embedded liner hitting the edge of the outer liner's opening. Under continuous swaying and impact, this causes severe scratches 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 larger the contact area between them. This means the ventilation gap between them is reduced and uneven, directly affecting the exhaust effect of the bottom compression space, leading to problems such as insufficient nesting depth and low efficiency.

[0009] On the other hand, existing disposable cups usually have a step at the bottom of the inner wall to limit and support the stacked cups, preventing them from being nested too deeply and difficult to separate. However, this step forms ridges, bends, and other obstructive structures on the flat wall, causing poor airflow between the two cups. During nesting, it is difficult to expel air from the bottom, resulting in high pressure resistance when stacking cups, and even problems such as the cups not falling into place. Utility Model Content

[0010] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a fluid supply inner cup and spray cup.

[0011] The objective of this utility model can be achieved through the following technical solution: a fluid supply inner cup, including a flexible liner, one end of which is an opening with a flange and the other end is sealed. A cup wall is connected between the opening and the sealed bottom. A rough area is provided on the outer surface of the cup wall. During the relative movement of one flexible liner and another flexible liner in 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, several flexible liners are nested together in sequence, and a gas storage space is formed between the bottom seals of adjacent flexible liners.

[0013] Preferably, relative movement occurs between adjacent flexible liners, and a flow air passage is formed between the cup walls of adjacent flexible liners. The contact gap and the flow air passage form an annular gap, and the gas 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.

[0015] Preferably, the cup wall and the bottom seal are connected by a rounded chamfer, and the bottom ring portion includes an annular area of ​​the cup wall near the bottom seal, a rounded chamfer, and an outer ring portion extending to the bottom seal.

[0016] Preferably, the rough area is arranged on the top ring portion of the cup wall near the opening, and an outwardly expanding step is provided between the top ring portion and the opening.

[0017] Preferably, the rough area is a ring-shaped portion in the middle of the cup wall, and the edge of the ring-shaped portion is straight, wavy, or serrated.

[0018] Alternatively, the rough area is spiral-shaped, extending from the bottom to the top of the cup wall;

[0019] Alternatively, the rough area may be in the shape of vertical stripes, extending in a straight line from the bottom to the top of the cup wall.

[0020] Preferably, the rough textures within the rough area are arranged continuously or intermittently.

[0021] A spray cup includes an outer cup and a flexible inner liner. The flexible inner liner is inserted into the cup body through the opening of the outer cup. The outer cup body is provided with scales, and the rough area on the cup wall of the flexible inner liner is arranged offset from the scales.

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

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

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

[0025] This invention creates rough textures on the outer surface of a soft, thin cup. The uneven textures create rough friction, further enhancing air permeability and support, without affecting the overall collapse effect of the soft, thin cup.

[0026] 1. During automatic cup stacking, the support structure reduces the swaying amplitude, relatively improving the coaxiality of the two cups during nesting. This maintains the annular gap between the two cups, and the air layer within the annular gap protects the outer surface of the cup wall, effectively preventing scratches caused by strong impacts during nesting and ensuring appearance quality. Simultaneously, the coordination of coaxiality and contact gap during automatic nesting creates a uniform and smooth internal and external ventilation structure, releasing air pressure between the two cups, eliminating internal pressure resistance, facilitating rapid and accurate cup stacking, and improving work efficiency.

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

[0028] 3. The rounded chamfered bottom ring of the cup body, combined with the straight cup wall, creates a smooth transition and a straight air passage, so as to ensure smooth gas flow during exhaust and intake, avoid local airflow blockage, optimize ventilation, and make stacking and separation of cups more stable and smooth.

[0029] 4. The rough area of ​​the flexible inner liner is staggered from the scale area of ​​the outer cup. After the two are assembled, the rough area avoids interference with the scale reading, ensuring that the scale is clear and readable and does not affect the user's accurate measurement of the liquid volume.

[0030] 5. The design of the flexible inner liner overlapping the outer cup rim allows for axial positioning of the flexible inner liner within the outer cup, facilitating rapid and stable cup stacking operations under the action of the vibrating cup stacking machine. At the same time, it ensures the layout of the rough area and the scale area, further guaranteeing the clear readability of the scale.

[0031] 6. The shape and distribution of the rough area can be designed flexibly and diversely, such as ring, straight strip, wave, spiral, etc., and can be customized according to actual needs. Different design forms can meet different usage scenarios and customer needs. Attached Figure Description

[0032] Figure 1 A structural diagram showing the arrangement of the rough region in the inner cup of the fluid supply system within the bottom ring portion.

[0033] Figure 2 A structural diagram showing the arrangement of the rough region in the inner cup of the fluid supply system within the top ring portion.

[0034] Figure 3 A structural diagram showing the arrangement of the rough regions in the inner cup for supplying this fluid in the bottom and top ring sections.

[0035] Figure 4 A structural diagram showing two flexible inner liners nested within the inner cup that supplies the fluid.

[0036] Figure 5 The diagram shows the wavy structure in the middle of the rough area in the inner cup for supplying this fluid.

[0037] Figure 6 This is a structural diagram showing the spiral shape of the rough region in the inner cup used to supply this fluid.

[0038] Figure 7 This is a structural diagram showing the vertical stripe shape of the rough area in the inner cup used to supply this fluid.

[0039] Figure 8 The diagram shows the structure of the rough regions in the inner cup for supplying this fluid, which are intermittently arranged in the bottom and top ring sections.

[0040] Figure 9 The diagram shows the structure in which the rough regions in the inner cup of the fluid supply are arranged in a discontinuous spiral shape.

[0041] Figure 10 The diagram shows the structure of the rough area in the inner cup of the fluid supply, which is arranged in a wavy, discontinuous manner.

[0042] Figure 11 This is a structural diagram of the spray cup.

[0043] In the diagram, 1. Flexible inner liner; 2. Flange; 3. Outwardly flared step; 4. Rough area; 5. Smooth area; 6. Bottom ring; 7. Rounded chamfer; 8. Top ring; 9. Gas storage space; 10. Contact gap; 11. Air passage; 12. Annular gap; 13. Outer cup; 14. Scale. Detailed Implementation

[0044] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0045] like Figures 1 to 4As shown, this fluid supply inner cup includes a flexible inner liner 1. One end of the flexible inner liner 1 is an opening with a flange 2, and the other end is sealed. A cup wall connects the opening and the sealed bottom. The cup wall of the flexible inner liner 1 can be a cylindrical or conical shape, but in order to facilitate the sequential nesting of multiple flexible inner liners 1, a conical shape with a slightly reduced diameter from the opening to the sealed bottom is usually adopted.

[0046] like Figure 4 As shown, several flexible liners 1 are nested together in sequence, forming a gas storage space 9 between the bottom seals of adjacent flexible liners 1. Relative movement occurs between adjacent flexible liners 1, and a flow passage 11 is formed between the cup walls of adjacent flexible liners 1. Specifically, a portion of the outer wall of one flexible liner 1 and a corresponding portion of the inner wall of another flexible liner 1 form the flow passage 11. The inner surfaces of the cup walls are all smooth surfaces, and the basic outer surface of the cup walls is also smooth. Rough areas 4 with certain textures are formed on the locally smooth outer surfaces through physical (sandblasting, grinding) and chemical (corrosion) treatments.

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

[0048] The smooth areas 5 on the outer surface of the cup wall, excluding the rough area 4, form the aforementioned air passage 11. The thickness of the cup wall in the rough area 4 is the same as that in the other smooth areas 5, although there may be an error of 0.01mm-0.1mm, which will not affect the use of the inner and outer cups 13. Because the rough area 4 and the smooth area 5 have the same thickness, their collapse behavior under air pressure is basically the same; however, because the uneven structure of the rough area 4 makes it slightly stronger than the smooth area 5, it can maintain a certain coaxiality between the two inner linings and provide a certain support strength for the circular cup body when nested or separated, so as to avoid the smooth area 5 from tilting or excessively deforming. A tilted or excessively deformed smooth area 5 will squeeze the air passage 11, causing local blockage and hindering uniform and smooth continuous ventilation.

[0049] Sliding friction refers to the resistance exerted on two materials along the tangential direction of their contact surfaces during relative sliding. The magnitude of sliding friction is related to the roughness of the contact surfaces and the magnitude of the pressure. The greater the pressure and the rougher the contact surfaces, the greater the sliding friction. Therefore, sliding friction between two smooth contact surfaces is specifically smooth friction, while sliding friction between at least one rough contact surface is specifically rough friction.

[0050] During the relative movement of the two flexible inner liners 1 in nesting or separation, the rough area 4 and the inner surface of the cup wall generate a contact gap 10 through rough friction. This contact gap 10 refers to the tiny gap or distance between the 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 concave parts form a gap, thus creating a gap while the two surfaces are in contact. That is, the greater the texture depth, the larger the bevel angle, and the smaller the smoothness, the more obvious the roughness of the rough area 4, and the larger the gap generated by its uneven structure. The contact gap 10 and the air passage 11 form an annular gap 12, and the air storage space 9 remains unobstructed from the outside through the annular gap 12. The nested part of the cup wall is a flat 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, which to a certain extent ensures the circumferential uniformity of the annular gap 12. During the exhaust and intake processes, this achieves a uniform, continuous and smooth ventilation effect between the air storage space 9 and the outside.

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

[0052] When using a vibrating cup stacking machine to automatically stack cups, the rough area 4 increases the sliding friction. During a single vibration, the downward displacement of one side of the embedded cup body is small, resulting in a smaller angle between the central axes of the two flexible inner liners 1. That is, the coaxiality of the two is relatively high, and a relatively uniform annular gap 12 is formed between them. This annular gap 12 provides circumferential protection space, so that the inner cup wall does not touch the cup mouth of the outer cup, thereby avoiding impact on the wall of the flexible inner liner 1, preventing scratches, and protecting the appearance of the product.

[0053] Meanwhile, to ensure precise and convenient nesting operations, the air volume within the storage space 9 needs to be rapidly discharged during the nesting process to prevent excessive internal pressure that could hinder the descent of the flexible liner 1. The roughened area 4 contacts the inner surface of the cup wall, and the rough structure provides a degree of support, improving the coaxiality of the nested flexible liners 1. This maintains a gap between the cup walls of the two flexible liners 1, preventing them from fitting together, thus ensuring that the annular gap 12 is uniformly unobstructed in the circumferential direction. Consequently, the air within the storage space 9 is compressed by the weight of the cup and discharged unimpeded through the contact gap 10 of the roughened area 4 and the air passage 11, ensuring both coaxiality of the nesting and rapid attainment of the nesting depth.

[0054] On the other hand, the flexible inner liner 1 is separated and the two bottom seals are relatively separated to increase the volume of the gas storage space 9. The gas is gradually removed by rubbing the inner surface of the cup wall through the rough area 4, and the external airflow enters the gas storage space 9 through the annular gap 12.

[0055] To facilitate the separation operation, the gas volume in the gas storage space 9 needs to be rapidly replenished during the separation process to avoid an internal vacuum and excessive external pressure that would make it difficult to extract the flexible inner liner 1. The roughened area 4 contacts the inner surface of the cup wall, and the rough structure provides a certain degree of support, improving the coaxiality of the two flexible inner liners 1 during separation. This ensures that the cup walls of the two flexible inner liners 1 maintain a gap and do not adhere, guaranteeing that the annular gap 12 is uniformly unobstructed in the circumferential direction. Thus, as the gas storage space 9 increases, external air enters the gas storage space 9 unimpeded through the airflow path 11 and the contact gap 10 of the roughened area 4, ensuring easy separation of the two nested flexible inner liners 1.

[0056] Preferred, such as Figure 1 As shown, the roughened area 4 is located on the bottom ring portion 6 where the cup wall connects to the bottom seal. The cup wall and the bottom seal are connected by a rounded chamfer 7. The bottom ring portion 6 includes an annular area of ​​the cup wall near the bottom seal, the rounded chamfer 7, and an outer ring portion extending to the bottom seal. The annular area is part of the cup wall, specifically the bottom area, and its height can be set as needed. The outer ring portion is part of the bottom seal, and its width can be set as needed.

[0057] The paper "The Influence of Local Bending in Pipelines on Pneumatic Lifting Performance" (Chinese Library Classification Number: TD522, Document Identification Code: A, Article Number: 0253-6099(2015)02-0033-05) points out that when a lift pipe contains local bends, its pneumatic lifting performance will inevitably decrease. Experiments show that local bends or sharp angles in the pipe structure will definitely affect ventilation efficiency. This design features a rounded chamfer 7 at the bottom edge of the cup wall, creating a smooth transition between the air storage space 9 and the annular gap 12. Combined with the straight channel formed by the annular gap 12, this constructs a smooth ventilation structure, facilitating rapid and continuous airflow into and out of the air storage space 9.

[0058] Preferred, such as Figure 2 As shown, the rough area 4 is arranged on the top ring portion 8 of the cup wall near the opening, and an outwardly expanding step 3 is provided between the top ring portion 8 and the opening. The diameter of the outwardly expanding step 3 is slightly larger than the diameter of the cup wall, and the outwardly expanding step 3 has an annular platform. When the flexible inner liner 1 and the outer cup 13 are assembled, they are positioned and fitted by the structure of the annular platform, the 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 platform and the flange 2. In addition, the diameter of the outwardly expanding step 3 matches the diameter of the cup lid. After the cup lid and the flexible inner liner 1 are closed, the outer wall of the cup lid diameter and the inner wall of the outwardly expanding step 3 form a sealing fit.

[0059] like Figure 1 As shown, the rough area 4 can be set separately in the bottom ring portion 6, such as... Figure 2 As shown, it can also be set separately in the top ring part 8, such as Figure 3 As shown, both the bottom ring portion 6 and the top ring portion 8 can be made into rough areas 4. During the insertion and separation strokes, the rough area 4 of the bottom ring portion 6 plays a major frictional role, participating in almost the entire stroke, and maintaining coaxiality and contact gap 10. The rough area 4 of the top ring portion 8 plays an auxiliary frictional role, acting briefly during the insertion or separation phases. During insertion, it provides frictional contact and ensures coaxiality; during separation, it provides a ventilation gap. The design where both the bottom ring portion 6 and the top ring portion 8 are made into rough areas 4 is the optimal solution, allowing for rapid cup stacking under the action of the vibrating cup stacker while protecting the outer surface of the cup wall from scratches.

[0060] The rough area 4 can also be set to other shapes and positions, and different shapes of rough areas 4 can be combined and matched according to needs.

[0061] For example, rough region 4 is the annular portion in the middle of the cup wall, and the edges of the annular portion are straight or wavy (e.g., ...). Figure 5 (as shown) or serrated.

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

[0063] like Figure 7 As shown, the rough area 4 is in the shape of a vertical strip, and the rough area 4 in the shape of a vertical strip extends in a straight line 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 can also be included, and the specific shapes are not limited to the few listed in this article.

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

[0066] like Figure 11 As shown, a spray cup includes an outer cup 13 and a flexible inner liner 1. The flexible inner liner 1 is inserted into the cup body through the opening of the outer cup 13. Scales 14 are arranged on the cup body of the outer cup 13. The rough area 4 on the cup wall of the flexible inner liner 1 is staggered from the scales 14.

[0067] The outer cup 13 is a transparent rigid cup body, with one end being the cup mouth and the other end being the cup bottom. A perforation is provided on the cup bottom, through which air enters, and the air pressure causes the flexible inner liner 1 to collapse. Scales 14 and other markings are set on the cup body of the rigid cup body using printing, engraving, or other methods.

[0068] The diameter of the mouth of the outer cup 13 is slightly larger than the diameter of the body. An annular ridge is formed at the junction of the mouth and the body. An annular outer edge is provided on the outer periphery of the mouth of the outer cup 13. After the flexible inner liner 1 is placed into the cup, the annular platform of the outwardly expanding step 3 of the flexible inner liner 1 overlaps on the annular ridge, and the flange 2 of the flexible inner liner 1 overlaps on the annular outer edge, thereby achieving axial positioning of the flexible inner liner 1 within the outer cup 13.

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

[0070] The arrangement of rough area 4 and scale 14 can be roughly divided into the following two types:

[0071] The first type has a minimum and maximum boundary for scale 14, with scale lines and scale values ​​arranged between the minimum and maximum boundaries. Typically, scale 14 is set around the central area of ​​the cup body, and the scale values ​​are arranged sequentially from bottom to top. The minimum and maximum boundaries can be indicated by red lines.

[0072] The rough area 4 located on the bottom ring portion 6 of the cup wall is below the lowest boundary, and / or the rough area 4 located on the top ring portion 8 of the cup wall is above the highest boundary. By designing the rough area 4 below the lowest boundary and / or above the highest boundary, it is possible to achieve rough friction from the nested cups without affecting the clarity of the scale area 14.

[0073] The second type involves setting graduations 14 along the axial direction in a localized area of ​​the cup body. These graduations 14 are typically small, occupying only a small portion of the cup's perimeter, with the remainder being blank. Rough areas 4 and smooth areas 5 are formed on the cup wall. For example, straight, wavy, or serrated rough areas 4 do not completely surround the cup wall, leaving a gap to form a smooth area 5; spiral-shaped rough areas 4 have intermittent gaps, forming a smooth area 5; the intervals between vertically shaped rough areas 4 form smooth areas 5. The area of ​​the smooth area 5 is not less than the area occupied by the graduations 14. When the flexible inner liner 1 is placed inside the outer cup 13, the graduations 14 overlap with the smooth area 5, thus not affecting the clarity of the graduations 14 area.

[0074] The specific embodiments described herein are merely illustrative examples of the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or substitute them with similar methods, without departing from the spirit of this invention or exceeding its defined scope. Although this invention has been detailed and described in the accompanying drawings and foregoing description, such descriptions are considered illustrative or exemplary rather than restrictive. It should be understood that changes and modifications can be made by those skilled in the art within the scope of the following claims. Specifically, this invention covers additional embodiments having any combination of features from the different embodiments described above. With regard to the use of the expressions "general" or "substantially," this patent application should be understood to disclose that the disclosure equally fully satisfies these features and values, i.e., without any of the foregoing characterizations as "general" or "substantially."

[0075] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A fluid supply inner cup, comprising a flexible liner, one end of which is an opening with a flange, and the other end is a sealed bottom, wherein a cup wall connects the opening and the sealed bottom, characterized in that, A rough area is provided on the outer surface of the cup wall. During the relative movement of nesting or separation between one flexible liner and another flexible liner, 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 as described in claim 1, characterized in that, Several flexible liners are nested together in sequence, and a gas storage space is formed between the bottom seals of adjacent flexible liners.

3. The fluid supply inner cup as described in claim 2, characterized in that, Relative movement occurs between adjacent flexible liners, and a flow air passage is formed between the cup walls of adjacent flexible liners. The contact gap and the flow air passage form an annular gap, and the gas storage space is connected to the outside through the annular gap.

4. The fluid supply inner cup as described in claim 1, characterized in that, The rough area is located on the bottom ring portion where the cup wall connects to the bottom seal.

5. The fluid supply inner cup as described in claim 4, characterized in that, The cup wall and the bottom are connected by a rounded chamfer. The bottom ring includes an annular area of ​​the cup wall near the bottom, a rounded chamfer, and an outer ring extending to the bottom.

6. The fluid supply inner cup as described in claim 1 or 4, characterized in that, The rough area is arranged on the top ring portion of the cup wall near the opening, and an outwardly expanding step is provided between the top ring portion and the opening.

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

8. The fluid supply inner cup as described in claim 1, characterized in that, The rough textures within the rough area are arranged continuously or intermittently.

9. A spray cup, comprising an outer cup and a flexible inner liner, wherein the flexible inner liner is inserted into the cup body through the opening of the outer cup, characterized in that, The outer cup has graduations on its body, and the rough areas on the flexible inner liner's cup wall are staggered from the graduations.

10. The spray cup as described in claim 9, characterized in that, The scale has a minimum boundary and a maximum boundary, with scale lines and scale values ​​arranged between the minimum boundary and the maximum boundary; the rough area located at the bottom ring of the cup wall is lower than the minimum boundary, and / or the rough area located at the top ring of the cup wall is higher than the maximum boundary.

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