TWM625866U - Dripper structure and coffee dripper - Google Patents

Abstract

The present invention provides a filter cup structure, including a surrounding body with an upper opening and a lower opening opposite to each other, and the area of the upper opening is larger than that of the lower opening; an inner wall, the inner wall is located between the upper opening and the lower opening Between the openings, there are a plurality of convex parts; wherein, the convex parts each extend from the edge of the upper opening to the lower opening, and the centerline of any one of the convex parts has an included angle with the edge of the upper opening, and the The included angle is 75 degrees to 89 degrees, which helps to improve the exhaust speed and the outflow rate of the filtrate. This creation also provides a coffee filter cup, which can further retain the aroma and heat of the coffee filtrate.

Description

Filter structure and coffee filter

This creation is about a filter cup structure, especially a coffee filter cup.

Coffee has a unique flavor and has always been one of the popular beverage options. Because of its energy-boosting effect, coffee has become the preferred drink in modern people's busy daily life.

Depending on the extraction method, coffee will produce different flavors and textures. For example, the instant coffee powder made by dehydrating the coffee extract can be drunk after adding hot water, which is convenient, but the richness of the flavor and taste level will be compromised. Espresso is a coffee concentrate obtained by pressurization, and has coffee fat. It not only has a mellow flavor, but also because it is a freshly brewed coffee, the richness of flavor and taste level is better than that of instant coffee powder.

Drip filtration coffee can best express the delicate and elegant original flavor of coffee beans, and highlights the characteristics of different coffee beans, so it is the most popular coffee brewing method. However, most of the drip coffee uses filter paper, and because the inner peripheral wall of the traditional filter cup is a smooth surface, the filter paper will be attached to the inner peripheral wall of the filter cup, which will hinder the extraction liquid from passing through the filter paper and delay the outflow rate of the coffee filtrate. , so there is a need for further improvement.

In order to solve the above problems, the present invention provides a filter cup structure, which includes a surrounding body with an upper opening and a lower opening opposite to each other, and the area of the upper opening is larger than the area of the lower opening; an inner wall, the inner wall is located in the Between the upper opening and the lower opening, there are a plurality of convex parts; wherein, the convex parts each extend from the edge of the upper opening to the lower opening, and the centerline of any one of the convex parts and the edge of the upper opening There is an included angle, and the included angle is 75 degrees to 89 degrees.

This creation is used to filter the coffee extract, and the surrounding body can be used to carry a filter device, such as filter paper, and by setting a plurality of protrusions, the area where the filter paper is attached to the inner wall can be reduced, and the coffee filtrate can be raised the outflow rate. At the same time, the design of the included angle between the center line of any of the convex parts and the edge of the upper opening allows the coffee filtrate to flow along the edge of the convex part and pass through the lower opening in the form of a vortex. The outflow rate of the coffee filtrate can also be further increased.

The above-mentioned design that the area of the upper opening is larger than the area of the lower opening is helpful to avoid the overflow of the coffee extract and to concentrate the coffee filtrate.

In one embodiment, the protruding portions extend beyond the edge of the lower opening to form protruding corners.

The above-mentioned "extending the edge of the lower opening to form a convex angle respectively" means that the distance from "the end point of the convex angle facing the center of the lower opening" to the center of the lower opening is smaller than the distance from "the edge of the lower opening where the convex angle is not provided" to the center of the lower opening. distance.

The above-mentioned "the centerline of any of the convex parts and the edge of the upper opening have an included angle" means that the centerline of any of the convex parts forms an included angle with the tangent of the upper opening; wherein, the point where the centerline and the tangent intersect is the tangent point, and the radius from the tangent point to the center of the upper opening is perpendicular to the tangent. described as follows:

First, since the included angle is 75 degrees to 89 degrees, not 90 degrees, the center line of any of the convex parts is not perpendicular to the tangent line, not the radius. Second, the included angle refers to the included angle to which the center line is deviated, that is, the smaller angle is the criterion. For example, the center line and the tangent of the upper opening can form an included angle of 70 degrees and 110 degrees. Refers to the included angle of 70 degrees. Third, the intersection point of the centerlines of the protruding parts is not the center of the upper opening, and the plurality of protruding parts are arranged to deflect in the same direction, which can form a clockwise or counterclockwise rotating structure. In addition to improving the exhaust speed and the outflow rate of coffee filtrate, it also helps to improve the balance of the extraction of each powder layer of coffee; and in terms of appearance design, it highlights the directionality and dynamic of the flow image, which is both beautiful. Visual effect.

Preferably, the included angle between the centerline of any one of the protruding parts and the edge of the upper opening is 79 degrees to 85 degrees, in addition to preventing the filter paper from being completely attached to the inner wall after being wet, it can effectively improve the filter paper and the inner wall. In addition to the exhaust space between the walls, it also reduces the risk of uneven accumulation of fine coffee grounds on the sides and bottom of the filter paper, so as to prevent the filtrate from being unable to flow out, resulting in prolonged soaking of coffee powder on the filter paper or incomplete extraction. In addition, compared with the 90-degree vertical design, it can more effectively increase the range and time of water contacting each powder layer of the coffee, so that the coffee can be extracted more evenly.

In one embodiment, the center line of any one of the protruding corners has an included angle with the edge of the lower opening, and the included angle is 53 degrees to 65 degrees. The edge of the lower opening refers to the edge of the lower opening "if the protruding corner is not provided". The definition of "the angle between the center line of any one of the convex corners and the edge of the lower opening" is the same as "the angle between the center line of any one of the convex parts and the edge of the upper opening".

Preferably, the angle between the center line of any of the protruding corners and the edge of the lower opening is 57 degrees to 61 degrees, which can effectively reduce the accumulation of fine coffee grounds on the side and bottom surfaces of the filter paper, and avoid excessive soaking time or extraction. Incomplete, and visually present the image of a turbine.

In one embodiment, the height of each of the protruding portions is 2 mm to 10 mm, for example: 2 mm, 4 mm, 6 mm, 8 mm or 10 mm. The height of the convex part can raise the filter paper, reduce the area where the filter paper is attached to the inner wall, and effectively increase the exhaust speed and the outflow rate of the coffee filtrate.

In one embodiment, the width of the convex portion is greater than 0 mm and less than 6 mm, for example: 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 5.5 mm.

In one embodiment, the respective widths of the protruding portions are tapered along the direction from the upper opening to the lower opening, so as to prevent the protruding portions from directly contacting each other.

In one embodiment, each of the protruding portions tapers away from the inner wall in a direction away from the inner wall, and forms a concave surface and a convex surface that are connected to each other. Preferably, the cross-section of the convex portion is a crescent shape, and the cross-section of the convex portion is the cross-section of the convex portion perpendicular to the direction “extending from the edge of the upper opening to the lower opening”, so as to further Improve filtrate discharge efficiency.

In one embodiment, the respective widths of the lobes taper toward the center of the lower opening to avoid direct contact between the lobes and help the filtrate to be discharged along the tips of the lobes. In one embodiment, each of the protruding corners tapers away from the inner wall and forms a concave surface and a convex surface that are connected to each other. Preferably, the cross-section of the protruding corner is a crescent shape, and the cross-section of the protruding corner is a cross-section perpendicular to the direction of the protruding corner and the direction "extending from the edge of the upper opening to the lower opening", so as to further Improve filtrate discharge efficiency.

The lower the width of the convex portion, the more helpful to increase the exhaust velocity and the outflow rate of the coffee filtrate.

In one embodiment, the number of the protrusions is 10 to 55. Preferably, the number of the protrusions is 30. When the number of the protruding parts is 30, the density of the protruding parts of the number is most beneficial to increase the exhaust speed and the outflow rate of the coffee filtrate.

In one embodiment, the protrusions are uniformly dispersed on the inner wall. Preferably, the protrusions are at the same distance from each other.

In one embodiment, the centerline of any one of the convex portions is a straight line or an arc.

In one embodiment, the surrounding body further includes a plurality of ridges, each of the ridges extends from the edge of the upper opening to the inner wall, and the length of the ridges is smaller than the length of the protrusions. Preferably, the length of the ridge is one-half to four-fifth of the length of the protrusion; more preferably, the length of the ridge is two-thirds of the length of the protrusion to three quarters.

In one embodiment, the ridges and the protrusions are spaced from each other.

In one embodiment, the ridges and the protrusions are uniformly dispersed on the inner wall. Preferably, the ridges and the convexes are at the same distance from each other.

The lengths of the above-mentioned ridges and protrusions are different, and the design of each other helps to uniformly increase the space between the filter paper and the inner wall, so as to effectively increase the exhaust speed and the outflow rate of the coffee filtrate.

Preferably, the angle between the centerline of any of the ridges and the edge of the upper opening is 75 degrees to 89 degrees; preferably, the angle between the centerline of any of the ridges and the edge of the upper opening is 79 degrees It can also prevent the filter paper from being completely attached to the inner wall after being wet, and can effectively improve the exhaust space between the filter paper and the inner wall, and reduce the uneven accumulation of fine coffee grounds on the side and bottom of the filter paper. There is a risk that the filtrate will not flow out, resulting in prolonged soaking of coffee grounds on filter paper or incomplete extraction.

Preferably, "the angle between the centerline of any one of the convex parts and the edge of the upper opening" is equal to or similar to "the angle between the centerline of any one of the ridges and the edge of the upper opening", so as to effectively improve Exhaust velocity and flow rate of coffee filtrate.

The above-mentioned "similar" means that the difference between the above-mentioned two included angles is less than 10%, and the larger angle shall be used as the benchmark.

In one embodiment, each of the ridges has a height of 2 mm to 10 mm. The height of the ridge can elevate the filter paper and reduce the area where the filter paper is attached to the inner wall, so as to effectively increase the exhaust speed and the outflow rate of the coffee filtrate.

In one embodiment, the width of the ridges is greater than 0 mm and less than 6 mm, for example: 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or 5.5 mm.

In one embodiment, the ridges taper away from the inner wall and form a concave surface and a convex surface. Preferably, the cross-section of the ridge is crescent-shaped, and the cross-section of the ridge is the cross-section of the ridge perpendicular to the direction "extending from the edge of the upper opening to the lower opening", so as to further Improve filtrate discharge efficiency.

In one embodiment, the respective widths of the ridges are tapered along the direction from the upper opening to the inner wall, so as to prevent the adjacent ridges and protrusions from directly contacting each other.

The smaller the width of the ridge, the more helpful it is to increase the speed of exhaust and the rate of coffee filtrate outflow.

In one embodiment, the width of the ridge portion is equal to or similar to the width of the convex portion. The "similar" means that the difference between the widths of the ridges and the protrusions is less than 10%, and the larger width is used as the benchmark.

In one embodiment, the total number of the convex parts and the ridges is 10 to 55; preferably, the total number of the convex parts and the ridges is 24 to 36. More preferably, the total number of the protrusions and the ridges is 30. When the sum of the number of protrusions and ridges is greater than or equal to 20, evenly distributing the number of protrusions and ridges will help to increase the exhaust speed and the outflow rate of coffee filtrate, and when the protrusions and ridges are When the total number of parts is 30, the effect of increasing the exhaust speed and the outflow rate of the coffee filtrate is the best.

In one embodiment, the filter cup structure further includes a bottom cover, and the bottom cover is connected with the edge of the lower opening. After the coffee filtrate leaves the filter cup structure of the present invention and flows into a accommodating body, the bottom cover can cover the accommodating body, so as to retain the aroma and heat of the coffee filtrate in the accommodating body.

In one embodiment, the bottom cover includes an inner bottom surface, and the inner bottom surface has an inner annular structure, a middle annular structure and an outer annular structure, wherein the inner annular structure communicates with the lower opening, and the inner annular structure The structure, the middle annular structure and the outer annular structure are all centered on the center of the lower opening, and together form a concentric circle structure. The inner annular structure, the middle annular structure and the outer annular structure help to improve the compliance of the bottom cover of the filter cup structure of the present invention with other container openings, such as the mouth of a coffee cup or the mouth of a filtrate collection pot, so as to prevent Delays the escape of aroma and heat during extraction.

In one embodiment, the area surrounded by the inner ring structure is smaller than the area surrounded by the middle ring structure, and the area surrounded by the middle ring structure is smaller than the area surrounded by the outer ring structure.

In one embodiment, the inner bottom surface is a curved surface.

In one embodiment, the height of the middle annular structure is greater than or equal to the height of the inner annular structure; preferably, the height of the middle annular structure is greater than the height of the inner annular structure.

In one embodiment, the height of the middle annular structure is greater than or equal to the height of the outer annular structure; preferably, the height of the middle annular structure is greater than the height of the outer annular structure.

In one embodiment, the depths of the inner annular structure, the middle annular structure and the outer annular structure compared to the inner bottom surface are respectively 1 mm to 5 mm, so as to effectively retain the aroma and heat of the coffee filtrate.

In one embodiment, the middle annular structure further has a plurality of ridges, and each of the ridges extends from an edge of the middle annular structure toward the outer annular structure. Preferably, the ridges extend from the edge of the middle annular structure toward the outer annular structure, and each form a ridge angle.

In one embodiment, the number of the ridges is 42 to 54; preferably, the number of the ridges is 48, so as to improve the aroma convection of the coffee filtrate.

In one embodiment, the respective widths of the ridges taper from the edge of the middle annular structure toward the direction of the outer annular structure.

In one embodiment, a ridge angle is formed at the edge of the ridge away from the middle annular structure.

In one embodiment, the ridge angle is in direct contact with the outer annular structure.

In one embodiment, the bottom cover further includes an outer bottom surface opposite to the inner bottom surface.

In one embodiment, the outer bottom surface is a curved surface.

The present invention also provides a coffee filter cup, which includes a surrounding body for carrying a filter paper, and has an upper opening and a lower opening opposite to each other, and the area of the upper opening is larger than the area of the lower opening; an inner wall, The inner wall is located between the upper opening and the lower opening, and has a plurality of protruding parts; wherein, the protruding parts extend from the edge of the upper opening to the lower opening, and go beyond the edge of the lower opening to form a protruding part. angle; wherein, the center line of any one of the convex parts and the edge of the upper opening have an included angle, and the included angle is 75 degrees to 89 degrees; the center line of any one of the convex angles has an included angle with the edge of the lower opening, And the included angle is 53 degrees to 65 degrees; and the center line of any one of the convex parts is a straight line or an arc; a plurality of ridges, and the ridges each extend from the edge of the upper opening to the inner wall, and the The length of the ridge is less than the length of the protrusion, and the ridge and the protrusion are spaced apart from each other and evenly distributed on the inner wall; and a bottom cover, and the bottom cover is connected with the edge of the lower opening; Wherein, the bottom cover includes an inner bottom surface and an outer bottom surface opposite to the inner bottom surface, and the inner bottom surface has an inner annular structure, a middle annular structure and an outer annular structure; wherein, the inner annular structure communicates with the lower opening , and the inner annular structure, the middle annular structure and the outer annular structure are all centered on the center of the lower opening, and together form a concentric structure; the height of the middle annular structure is greater than the height of the inner annular structure; and the middle annular structure The height of the annular structure is greater than the height of the outer annular structure; the middle annular structure has a plurality of ridges, and the ridges each extend from the edge of the middle annular structure toward the outer annular structure; and the outer bottom surface is a curved surface; wherein , the sum of the number of the protrusions and the ridges is 24 to 36; and the number of the ridges is 42 to 54.

Preferably, the coffee filter cup of the present invention has any one or a combination of all the technical features of the above-mentioned filter cup structure.

To sum up, the filter cup structure and coffee filter cup of this creation can not only improve the exhaust speed and the outflow rate of the coffee filtrate, but also retain the aroma and heat of the coffee filtrate, which has a great market advantage.

Several operation modes are provided below in order to explain the implementation of this creation; those skilled in the art can easily understand the advantages and effects that this creation can achieve through the contents of this specification, and perform various operations without departing from the spirit of this creation. Modifications and alterations to implement or apply the content of this creation.

Example 1: filter bowl structure

As shown in FIG. 1A and FIG. 1B , first, the filter cup structure 1A includes a surrounding body 10 having opposite upper openings 101 and lower openings 102 , and the area of the upper opening 101 is larger than that of the lower opening 102 ; The wall 103, the inner wall 103 is located between the upper opening 101 and the lower opening 102, and has a plurality of convex parts 1031; wherein, the convex parts 1031 respectively extend from the edge of the upper opening 101 to the lower opening 102, and Beyond the edge of the lower opening 102 to form a convex angle 1032, and the centerline 1034 of any one of the convex portions 1031 and the edge of the upper opening 101 have an included angle, and the included angle Θ1 is 83 degrees, which can make coffee filtrate (not Shown) flows along the edge of the convex portion 1031 and passes through the lower opening 102 in the form of a vortex, which can not only increase the exhaust speed, but also further increase the outflow rate of the coffee filtrate.

Second, the centerline of any one of the protruding corners 1032 (ie, the centerline 1034 of any one of the protruding portions 1031 ) has an included angle with the edge of the lower opening, and the included angle Θ2 is 59 degrees; The center line 1034 is a straight line; and the respective widths of the protruding portions 1031 are tapered along the direction from the upper opening 101 to the lower opening 102 to avoid direct contact between the protruding portions 1031 and the respective widths of the protruding corners 1032. The direction of the center of the lower opening 102 is tapered to prevent the protruding corners 1032 from directly contacting each other.

Third, the surrounding body 10 further includes a plurality of ridges 1033, the ridges 1033 each extend from the edge of the upper opening 101 to the inner wall 103, and do not extend to the lower opening 102 as the convex portion 1031, so the above The length of the ridges 1033 is smaller than the length of the protruding parts 1031, and the ridges 1033 and the protruding parts 1031 are spaced apart from each other and evenly dispersed on the inner wall 103, so as to effectively increase the exhaust speed and the outflow rate of the coffee filtrate .

Fourth, the angle between the centerline (not shown) of any one of the ridges 1033 and the edge of the upper opening 101 is 83 degrees; the respective widths of the ridges 1033 are along the direction from the upper opening 101 to the inner wall 103 Tapered to prevent adjacent ridges 1033 and ridges 1031 from directly contacting each other; and the total number of the ridges 1031 and ridges 1033 is 30.

As shown in FIG. 2 , in addition to the surrounding body 10 , the filter cup structure 1A further includes a bottom cover 11 , and the bottom cover 11 is connected to the edge of the lower opening (not shown) of the surrounding body 10 .

Example 2: Coffee filter cup

As shown in FIG. 3 , the coffee filter cup 1B includes a surrounding body 10 for carrying a filter paper (not shown), and has an upper opening 101 and a lower opening 102 opposite to each other, and the area of the upper opening 101 is larger than The area of the lower opening 102; an inner wall 103, the inner wall is located between the upper opening 101 and the lower opening 102, and has a plurality of convex parts 1031; wherein, the convex parts 1031 respectively extend from the edge of the upper opening 101 Protruding corners 1032 are respectively formed by extending to the lower opening 102 and beyond the edge of the lower opening 102 .

The centerline (not shown) of any one of the protruding parts 1031 has an included angle with the edge of the upper opening 101 , and the included angle is 83 degrees; The edges have an included angle, and the included angle is 59 degrees; and the center line (not shown) of any one of the protrusions 1031 is a straight line.

The inner wall 103 further has a plurality of ridges 1033, and the ridges 1033 each extend from the edge of the upper opening 101 to the inner wall 103, and the length of the ridges 1033 is smaller than the length of the protrusions 1031, and The ridges 1033 and the protrusions 1031 are spaced apart from each other and evenly dispersed on the inner wall 103 .

The coffee filter cup 1B further includes a bottom cover 11, and the bottom cover 11 is connected with the edge of the lower opening 102; wherein, the bottom cover 11 includes an inner bottom surface 110 and an outer bottom surface 111 opposite to the inner bottom surface 110, and the bottom cover 11 The inner bottom surface 110 has an inner annular structure 1101, a middle annular structure 1102 and an outer annular structure 1103; wherein, the height of the middle annular structure 1102 is greater than that of the inner annular structure 1101; the height of the middle annular structure 1102 is greater than that of the outer annular structure 1103; and the outer bottom surface 111 is a curved surface.

As shown in FIG. 4 , the inner annular structure 1101 communicates with the lower opening 102 , and the inner annular structure 1101 , the middle annular structure 1102 and the outer annular structure 1103 are all centered on the center of the lower opening 102 and form together concentric circle structure; and the middle annular structure 1102 has a plurality of ridges 11020, and the ridges 11020 extend from the edge of the middle annular structure 1102 toward the outer annular structure 1103, and each form a ridge angle 11021; and the ridges The number of 11020 is 48, so that after the coffee filtrate flows into a container (not shown), the aroma of the coffee filtrate is enhanced to convect in the container.

To sum up, the filter cup structure and coffee filter cup of this creation can not only improve the exhaust speed and the outflow rate of coffee filtrate, but also retain the aroma and heat of the coffee filtrate, which is especially suitable for consumers who like to taste the flavors and characteristics of different coffee beans. By.

1A: filter bowl structure 1B: Coffee filter cup 10: Surround 101: upper opening 102: Lower opening 103: inner wall 1031: convex part 1032: lobe 1033: Ridge 1034: Centerline 11: Bottom cover 110: inner bottom surface 111: Outer Bottom 1101: Inner ring structure 1102: Medium Ring Structure 1103: Outer Ring Structure 11020: ridges 11021: Ridge angle Θ1,Θ2: included angle

1A and 1B are top views of the structure of the filter bowl of the first embodiment. FIG. 2 is a perspective view of the structure of the filter cup of Example 1. FIG. FIG. 3 is a cross-sectional view of the coffee filter cup of Example 2. FIG. FIG. 4 is a bottom view of the coffee filter cup of Example 2. FIG.

1A: filter bowl structure

10: Surround

101: upper opening

102: Lower opening

103: inner wall

1031: convex part

1032: lobe

1033: Ridge

Claims (10)

A filter bowl structure, including an encircling body, which has Opposite the upper opening and the lower opening, and the area of the upper opening is larger than the area of the lower opening; an inner wall, the inner wall is located between the upper opening and the lower opening, and has a plurality of convex parts; wherein, the convex parts each extend from the edge of the upper opening to the lower opening, and any one of the convex parts The center line and the edge of the upper opening have an included angle, and the included angle is 75 degrees to 89 degrees. The filter cup structure according to claim 1, wherein the protruding parts extend beyond the edge of the lower opening to form a protruding angle; the centerline of any one of the protruding corners has an included angle with the edge of the lower opening, and the included angle is 53 degrees to 65 degrees; the number of the protruding parts is 10 to 55, and the protruding parts are evenly dispersed on the inner wall; and the height of the protruding parts is 2 mm to 10 mm. The filter cup structure according to claim 1, wherein the number of the protruding parts is 30; the included angle between the center line of any one of the protruding parts and the edge of the upper opening is 79 degrees to 85 degrees. The filter cup structure according to claim 1, wherein the center line of any one of the protruding parts is a straight line or an arc; and the protruding parts taper away from the inner wall and form a continuous A concave surface and a convex surface. The filter cup structure according to claim 1, wherein the surrounding body further comprises a plurality of ridges, the ridges each extend from the edge of the upper opening to the inner wall, and the length of the ridges is smaller than the length of the protrusions the length, and the ridges and the protrusions are spaced apart from each other and evenly dispersed on the inner wall. The filter cup structure of claim 1, wherein the filter cup structure further comprises a bottom cover, and the bottom cover is connected with the edge of the lower opening. The filter cup structure according to claim 6, wherein the bottom cover comprises an inner bottom surface, and the inner bottom surface has an inner annular structure, a middle annular structure and an outer annular structure, wherein the inner annular structure communicates with the lower opening , and the inner annular structure, the middle annular structure and the outer annular structure are all centered on the center of the lower opening, and together form a concentric circle structure. The filter cup structure according to claim 7, wherein the inner bottom surface is a curved surface. The filter cup structure of claim 7, wherein the height of the middle annular structure is greater than the height of the inner annular structure; and the height of the middle annular structure is greater than the height of the outer annular structure. A coffee filter cup, comprising an encircling body, which has Opposite the upper opening and the lower opening, and the area of the upper opening is larger than the area of the lower opening; an inner wall, the inner wall is located between the upper opening and the lower opening, and has a plurality of convex parts; wherein, the convex parts each extend from the edge of the upper opening to the lower opening and beyond the edge of the lower opening to each form a lobe; wherein, The center line of any one of the protruding parts has an included angle with the edge of the upper opening, and the included angle is 75 degrees to 89 degrees; the center line of any one of the protruding parts has an included angle with the edge of the lower opening, and the included angle is 53 degrees to 65 degrees; and the centerline of any one of the protruding parts is a straight line or an arc, and the protruding parts taper away from the inner wall from the inner wall, and form a concave surface and a convex surface that are connected ; a plurality of ridges, and each of the ridges extends from the edge of the upper opening to the inner wall, and the length of the ridges is less than the length of the protrusions, and the ridges and the protrusions are spaced apart from each other, and uniformly dispersed in the inner wall; and a bottom cover, and the bottom cover is connected with the edge of the lower opening; wherein, the bottom cover includes An inner bottom surface and an outer bottom surface opposite to the inner bottom surface, and the inner bottom surface has an inner annular structure, a middle annular structure and an outer annular structure; wherein, The inner annular structure communicates with the lower opening; The inner annular structure, the middle annular structure and the outer annular structure are all centered on the center of the lower opening, and together form a concentric structure; The height of the middle annular structure is greater than the height of the inner annular structure; and the height of the middle annular structure is greater than the height of the outer annular structure; The middle annular structure has a plurality of ridges, and the ridges each extend from an edge of the middle annular structure toward the outer annular structure; and The outer bottom surface is a curved surface; wherein, The sum of the numbers of the protrusions and the ridges is 24 to 36; and the number of the ridges is 42 to 54.

Images