JP3330353B2 - Liquid removal method and device used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for impregnating a wood part or a sintered material member with a treatment liquid such as oil or resin, or immersing the same with various treatment liquids. And a device used therefor.

[0002]

2. Description of the Related Art Conventionally, a member to be treated such as a wood part or a sintered member is impregnated with a treatment liquid such as oil or resin, or immersed, and then adheres to the surface of the member to be treated or the like. Excessive processing solution is drained. Then, in order to efficiently perform this liquid removal, a centrifugal liquid remover is used. That is, after removing the inner tank of the basket from the immersion tank, take out the processing target member and the like from the inner tank of the basket and transfer it to the inner tank of the centrifugal dewatering machine, or mount the entire inner tank of the basket in the inner tank of the centrifugal dewatering machine. Then, drain the solution.

[0003] The treated liquid that has been drained is collected by the inner surface of the outer tank of the centrifugal separator, and accumulates at the bottom of the outer tank. The processing liquid collected at the bottom passes through a drain pipe provided at the bottom of the outer tank, is guided to an external drain groove, and is discarded. Used.

[0004]

However, in the above-mentioned conventional method, when there are two or more types of processing liquids, the processing liquids are mixed in a centrifugal dewatering machine. It was difficult to collect and reuse.

[0005] For this reason, in the above-mentioned conventional method, in order to avoid mixing of the processing liquids, a dedicated centrifugal dewatering machine is used for each processing liquid, or every time the type of the processing liquid changes, the centrifugal dewatering is performed. It was necessary to wash the inside of the liquid machine to remove the adhering liquid. The former is uneconomical and the latter has a problem in that workability and productivity are poor.

The present invention has been made in view of such circumstances, and even if there are two or more types of processing liquids, a centrifugal dewatering machine can be used to easily separate and collect the processing liquid after the liquid removal processing. It is an object of the present invention to provide a liquid method and an apparatus used for the method.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a liquid removing method for performing a liquid removing treatment on a member to be treated which has been subjected to immersion or impregnation. A step of preparing a centrifugal dewatering machine having an inner tank to be loaded and an outer tank accommodating the inner tank; and collecting a processing liquid centrifugally separated from the inner tank in a gap between the inner tank and the outer tank. a step of removably installed removably collected tank which can be, by rotating the inner tub loaded with the processed member in liquid removing process, the reservoir of the treatment liquid that has left from the processing object member in the collecting tank And a step of taking out the collecting tank from the centrifugal dewatering machine together with the stored processing liquid.
The dewatering method using the method described in (A) is described in the first gist.
Then, use the inner tank described in (B) below.
The liquid method is a second gist . (A) Double mounted detachably on rotating part of centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface and the lid, the member to be treated is
Removably mounts with a gap that cannot pass through
An inner tank that can be removed. (B) Double mounted detachably on the rotating part of the centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface of the
The cylindrical wall that is narrower toward the top
The top tube-shaped inner tube portion is provided so as to be located inside the wall body.
Inner tank.

[0008] Further, there is provided a liquid removing apparatus for performing a liquid removing process on a member to be treated which has been subjected to immersion or impregnation, and comprises an inner tank for loading the member to be treated and an outer tank for accommodating the inner tank. A centrifugal dewatering machine equipped with a collecting tank that is detachably installed in a gap between the inner tank and the outer tank and that can collect the processing liquid centrifugally separated from the inner tank . Tank
As a third aspect, a liquid removing device using the device described in the above (A) is described as the third gist, and the device described in the above (B) is used as the inner tank.
A fourth aspect of the present invention is to provide a liquid removing apparatus using the above .

That is, since the dewatering method of the present invention includes the above-mentioned steps, even if there are two or more types of processing liquids, if the collecting tank is replaced and used every time the processing liquid changes, Each processing solution can be separated and collected without being mixed with each other. In this case, two or more kinds of processing liquids can be separated and collected by one centrifugal dewatering machine, which is economical. In addition, even if the type of the processing liquid is changed, it is not necessary to wash the inside of the centrifugal dewatering machine to remove the adhering liquid, so that the workability and the productivity are excellent.

In addition, since the liquid removing apparatus of the present invention has the above-described configuration, even if there are two or more types of processing liquids, the number of collecting tanks is prepared by the number of the types of processing liquids, and the number of collecting tanks is different each time the processing liquid changes. After the collecting tank is removably installed in the gap between the inner tank and the outer tank, the inner tank is rotated to remove the liquid, and the collecting tank is taken out of the centrifugal drainer together with the stored processing liquid. By doing so, each processing solution can be separated and collected without being mixed with each other. According to this configuration, two or more types of processing liquids can be separated and collected by one centrifugal dewatering machine, which is economical. In addition, even if the type of the processing liquid is changed, it is not necessary to wash the inside of the centrifugal dewatering machine to remove the adhering liquid, so that the workability and the productivity are excellent.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the liquid removing method of the present invention and an apparatus used therefor. In this embodiment, the dewatering method is to perform a dewatering process after immersing or impregnating the processing target member P using the first processing liquid L,
Subsequently, a deliquoring method is performed in which the member to be processed P is immersed or the like using the second processing liquid and then subjected to deliquoring processing, and such a series of processing is sequentially performed for each processing liquid. The dewatering apparatus used therein is a centrifugal dewatering machine M having an inner tank A for loading the member to be treated P and an outer tank Z for accommodating the inner tank A, and the inner tank A and the outer tank Z. And a collection tank 20 that is detachably installed in the gap between the collection tank 20 and that can collect the processing liquid centrifugally separated from the inner tank A.

The inner tank A of the centrifugal dewatering machine M is removably mounted on the rotating part R of the centrifugal dewatering machine M. As shown in FIGS. It is a container having a double cylinder structure provided with a cylindrical portion 1 and an inner cylindrical portion 2 having a heavenly cylindrical shape, and has a gap between an inner peripheral surface 1 a of the outer cylindrical portion 1 and an outer peripheral surface of the inner cylindrical portion 2. The lid 3 is detachably attached with a gap 4 having a size that does not allow the processing target member P to pass therethrough.

The outer cylindrical portion 1 has an inner peripheral surface 1a.
Has a tapered shape formed wider as the position becomes higher.
The taper angle (the angle between the central axis of the outer cylinder portion 1 and the inner peripheral surface 1a) is not particularly limited, but is preferably set to 3 ° or more, particularly 5 ° to 15 °. .

The inner cylindrical portion 2 has an opening 2a opened at the bottom surface of the bottomed cylindrical outer cylindrical portion 1. Further, a fixing tool 5 for fixing to the rotating portion R of the centrifugal dewatering machine M is provided at the center of the top plate 2b of the inner cylindrical portion 2. The fixing device 5 is provided so as to penetrate the top plate 2b. Above the top plate 2b, an annular portion 5a for hooking a hook such as a crane is formed at the upper end of the fixing device 5. Under the part 5a, the fixing device 5
Is provided with a first stopper 5b for preventing the falling of the first stopper 5b. Below the top plate 2b, a male screw 5c for fixing to the rotating part R of the centrifugal dewatering machine M is formed at the lower end of the fixture 5, and above the male screw 5c portion, the top plate 2
b for preventing the fixing device 5 from falling out of
A stopper 5d is formed. The distance between the first stopper 5b and the second stopper 5d is larger than the thickness of the top plate 2b, and the space is slidable on the top plate 2b at the distance. Further, a male screw body 6 for attaching the lid 3 is provided to protrude upward from a peripheral portion of the top plate 2b.

In the inner tank A, the outer cylinder part 1 and the inner cylinder part 2 are formed of a non-perforated plate so that liquid does not leak from the peripheral side part and the bottom part.

The lid 3 has a central protruding portion 3a and a flange portion 3b fitted to the upper portion of the inner cylindrical portion 2, and the central portion of the central protruding portion 3a has the first stopper 5b An opening 3c having a diameter slightly larger than the diameter of the opening 3c is formed. Further, on the outer peripheral portion of the opening 3c, a male screw body 6 is provided at a position corresponding to the male screw body 6.
An opening 3d having a diameter slightly larger than the diameter of the opening 3d is formed.

As shown in FIGS. 1 and 4, the collection tank 20 is formed in a cylindrical shape, and a liquid storage portion 21 having an open top is provided along the inner peripheral surface thereof. In addition, a liquid drain valve 22 is provided in the reservoir 21. Further, a flange portion 23 is formed at an upper end of the collection tank 20 along an opening edge, and an annular portion 24 for hooking a hook such as a crane is provided on an upper surface of the flange portion 23. And, at the lower peripheral edge of the collection tank 20,
A leg 25 is provided. Further, the flange portion 23
Is formed larger than the outer diameter of the inner tank A. Further, the height of the collecting tank 20 is set higher than the upper end opening of the inner tank A when the inner tank A and the collecting tank 20 are installed in the centrifugal dewatering machine M. The height of the upper open surface of the portion 21 is set lower than the upper end opening of the inner tank A. Then, the collection tanks 20 having the above-described configuration are prepared by the number of types of the processing liquid.

The impregnation or immersion treatment using the inner tank A can be performed, for example, as follows. That is, first, as shown in FIG. 3, the processing target member P is loaded into the gap between the outer cylinder part 1 and the inner cylinder part 2 of the inner tank A, and the first processing liquid L is injected. Then, by maintaining the predetermined time, the first impregnation process or the like is completed.

When the impregnation process or the like is completed, first, a hook of a crane or the like is hooked on the annular portion 24 of the collection tank 20 shown in FIG. 4 to be lifted and transported, and as shown in FIG. It is housed in the centrifugal drainer M. Then, the lid 3
Is attached to the inner tank A, and the nut 8 is screwed and fixed to the male screw body 6. Then, a hook of a crane or the like is hooked on the annular portion 5a of the fixture 5 to be lifted and transported, and the inner tank A containing the processing target member P and the first processing liquid L is located inside the collection tank 20. In the centrifugal dewatering machine M as described above. At this time, the inner cylinder part 2 of the inner tank A is fitted to the rotating part R of the centrifugal dewatering machine M. Then, the male screw 5 of the fixture 5
c and the female screw 7 formed at the upper end of the rotating part R are screwed together to fix the inner tank A to the rotating part R. after that,
The centrifugal dewatering machine M is operated as usual, and the dewatering process is performed.
In FIG. 1, reference numeral 9 denotes an opening / closing lid of the centrifugal dewatering machine M;
Is an opening / closing device for the opening / closing lid 9, 11 is a support column of the centrifugal dewatering machine M, 12 is a rotation drive unit of the centrifugal dewatering machine M, and 13 is a rotation drive transmission unit.

When the liquid removal processing is performed in this manner, the processing target member P and the first processing liquid L are not located on the rotating shaft portion of the rotating portion R, and therefore, the processing target member P and the first processing liquid L are not positioned.
Centrifugal force surely acts on the processing liquid L. Since the inner peripheral surface 1a of the outer cylindrical portion 1 is formed wider as it goes upward, the first processing liquid L separated from the processing target member P and the excess first processing liquid L are centrifugally applied. Then, after ascending along the inner peripheral surface 1a of the outer cylindrical portion 1 to the upper end edge of the outer cylindrical portion 1, it is centrifugally separated. At this time, the member to be processed P also rises along the inner peripheral surface 1a of the outer cylindrical portion 1, but is pressed by the flange portion 3b of the lid 3, and the member to be processed P jumps out of the inner tank A. Will be blocked. Therefore, the first
Only the processing liquid L rises to the upper end edge of the outer cylinder part 1 and separates by centrifugation.

Then, the first processing liquid L separated by centrifugation accumulates in the liquid reservoir 21 of the collection tank 20. After that, the fixing between the rotating part R of the centrifugal dewatering machine M and the inner tank A is released, and the collecting tank 20 is removed from the centrifugal dewatering machine M following the inner tank A by a crane or the like. Next, the drain valve 22 of the collection tank 20
Is opened, and the first processing liquid L collected in the liquid storage part 21 is collected. Then, the collected first processing liquid L is reused.

Next, the lid 3 of the inner tank A taken out of the centrifugal dewatering machine M is removed, and a gap of a different type from the first processing liquid L is provided in the gap between the outer cylinder 1 and the inner cylinder 2. Inject the second processing solution. Then, the second impregnation process or the like is completed by maintaining the predetermined time. Next, in the same manner as in the case of the first treatment liquid L, the other collection tank 20 is accommodated in the centrifugal dewatering machine M, and thereafter, the same dewatering treatment as described above is performed. The second processing liquid collected in the liquid storage part 21 is collected.

The above-described series of processing is sequentially performed for each processing solution.

As described above, in the above embodiment, the processing liquid centrifugally separated from the inner tank A can be collected in the gap between the inner tank A and the outer tank Z of the centrifugal dewatering machine M. Since the collecting tank 20 is detachably installed and the collecting tanks 20 are prepared by the number of types of the processing liquid, even if there are two or more types of the processing liquid,
Each processing solution can be separated and collected without being mixed with each other. In this case, two or more kinds of processing liquids can be separated and collected by one centrifugal dewatering machine, which is economical. In addition, even if the type of the processing liquid is changed, it is not necessary to wash the inside of the centrifugal dewatering machine to remove the adhering liquid, so that the workability and the productivity are excellent.

In the conventional impregnation treatment or the like, a immersion process in which a treatment liquid is contained in a state in which the member P to be treated is loaded in a basket-like inner tank made of a nest plate (porous plate material), a wire mesh or the like is loaded. It was done by putting it in a tank. Thereafter, the member P and the inner tank of the basket were conveyed to a centrifugal dewatering machine for the purpose of dewatering. And, at the time of the transportation,
The treatment liquid often dripped. Such dripping of the processing liquid not only causes a loss of the processing liquid, but also deteriorates the working environment. Furthermore, when a harmful processing solution is used, safety also becomes a problem.

On the other hand, in the above embodiment, the member P to be treated is impregnated or immersed in the inner tank A, and then the member P to be treated and the processing liquid are put into the inner tank A. The liquid is dewatered using the centrifugal dewatering machine M as it is. For this reason, dripping of the processing liquid after the conventional impregnation processing or the like can be eliminated, and problems such as loss of the processing liquid, deterioration of the working environment, and danger can be solved.

Further, since each processing solution is collected and reused, it is possible to prevent any loss of the processing solution, which is economical.

FIG. 5 shows a modification of the inner tank A.
You. This inner tankCAre the inner peripheral surface 1a of the outer cylindrical portion 1 and the inner cylindrical portion.
In the space between the outer peripheral surface ofInner circumference
Is formed narrower asCylindrical wall 17
However, the above-mentioned walled inner cylindrical part 2 is7Located inside
And the lid 3 (see FIG. 3) is provided.
Not something. Other configurations are the same as those of the above-described embodiment.
And the same parts are denoted by the same reference numerals.

The porous sheet of the wall body 1 7 is a plurality of through holes 1 7 a are uniformly arranged over the entire surface, the size of each through-hole 1 7 a processing target member P is It is a size that cannot pass through.

When the impregnation or immersion treatment is performed using the inner tank C , the member to be treated P is loaded into the space between the wall 17 and the inner cylinder part 2 and the treatment liquid is filled. It can be performed by injection.

After the impregnation process or the like is completed, the member P to be treated is processed using a crane or the like in the same manner as in the above embodiment.
Then, the inner tank C containing the processing liquid is accommodated in the centrifugal dewatering machine M, and the dewatering process is performed.

In the case of this liquid removing treatment, the member to be treated P is not located on the inner peripheral surface 1a of the outer cylinder portion 1 due to the wall 17 , so that even if the inner tank C is rotated, The processing target member P does not rise. Rather, the member to be processed P is
Descend. Therefore, the difference between the processing liquid L and the processing target member P
Separation is performed effectively. Accordingly, the lid 3 (see FIG. 3) is not provided in the inner tank C. Other operations and effects are the same as those of the above-described embodiment.

In the above embodiment, the collection tank 20 was taken out of the centrifugal dewatering machine M after the inner tanks A and C were taken out. May be set to an appropriate size so that the collection tank 20 is detachable even when the inner tanks A and C are fixed in the centrifugal dewatering machine M. In this case, impregnation or the like can be performed in the centrifugal dewatering machine M without removing the inner tanks A and C.

Further, in the above-described embodiment, the outer cylindrical portion 1,
Although the inner cylinder 2 and the wall 17 are cylindrical, the invention is not limited to this, and a polygonal cylinder having a polygonal cross section may be used.

Further, the tank C above, but was not provided the lid 3, the magnitude of the relationship between the through-hole 17 a of the processing object member P and the wall 17, the processing target member P is wall 17 Through hole
The like if there is a risk that pass through the 17 a, the lid 3
May be provided.

Further, in the above-described embodiment, the impregnation treatment and the like are performed under normal pressure. However, if necessary, the inner tanks A and C are housed in a vacuum treatment tank or a pressure treatment tank or the like, and the vacuum impregnation treatment or the like is performed. May be performed.

And, the inner tanks A ,
C and the rotating part R of the centrifugal dewatering machine M are fixed by the fixing device 5
The method is not limited to the method in which the male screw 5c of the rotary member R and the female screw 7 of the rotating portion R are screwed, and another method may be used.

[0039]

As described above, according to the dewatering method of the present invention, even if there are two or more types of processing liquids, if the collecting tank is replaced and used every time the processing liquid changes, Each processing liquid can be separately collected without the processing liquid being mixed. In this case, two or more kinds of processing liquids can be separated and collected by one centrifugal dewatering machine, which is economical. In addition, even if the type of the processing liquid is changed, it is not necessary to wash the inside of the centrifugal dewatering machine to remove the adhering liquid, so that the workability and the productivity are excellent.

According to the liquid removing apparatus of the present invention, even if there are two or more kinds of processing liquids, the number of collecting tanks is prepared by the number of kinds of processing liquids, and a different collecting tank is prepared every time the processing liquid changes. If the inner tank is removably installed in the gap between the inner tank and the outer tank, then the inner tank is rotated to perform liquid removal processing, and the collecting tank is taken out of the centrifugal dewatering machine together with the stored processing liquid. In addition, each processing solution can be separated and collected without being mixed with each other. And according to this configuration, with one centrifugal dewatering machine,
Since two or more types of processing liquids can be separated and collected,
It is economical. In addition, even if the type of the processing liquid is changed, it is not necessary to wash the inside of the centrifugal dewatering machine to remove the adhering liquid, so that the workability and the productivity are excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a liquid removing method and an apparatus used therein according to the present invention.

FIG. 2 is an explanatory view showing an inner tank used in the above method and apparatus.

FIG. 3 is an explanatory diagram showing an impregnation process and the like using the inner tank for processing.

FIG. 4 is an explanatory view showing a collecting tank used in the above method and apparatus.

FIG. 5 is an explanatory view showing a modified example of the inner tank.

[Explanation of symbols]

 M Centrifugal dewatering machine A Inner tank Z Outer tank 20 Collection tank

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B04B 3/00 B05C 11/10 F26B 5/08

Claims (4)

(57) [Claims] An object to be treated which has been immersed or impregnated.
A liquid removal method for performing a liquid removal treatment on a member,
The inner tank for loading the target member and the outer tank for containing the inner tank
A step of preparing a centrifugal drainer provided with the inner tank and the outer tank
Between the inner tank and the processing solution collected by centrifugation.
A step of detachably installing a collecting tank capable of
Rotate the inner tank loaded with the components to be treated to remove liquid,
The processing liquid separated from the target member is stored in the collection tank.
Then, centrifuge the whole of the processing solution stored in the collection tank.
Removing from the liquid machine,
Liquid removal method characterized by using the one described in (A)
Law. (A) Double mounted detachably on rotating part of centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface and the lid, the member to be treated is
Removably mounts with a gap that cannot pass through
An inner tank that can be removed . 2. A dewatering method for performing a dewatering process on a member to be processed which has been subjected to immersion or impregnation, comprising an inner tank for loading the member to be processed and an outer tank for accommodating the inner tank. A step of preparing a centrifugal dewatering machine, and a step of detachably installing a collection tank capable of collecting the processing liquid centrifugally separated from the inner tank in the gap between the inner tank and the outer tank , The inner tank loaded with the member to be processed is rotated to perform liquid removal processing, and the processing liquid separated from the member to be processed is stored in the collection tank. Then, the processing liquid stored in the collection tank is centrifugally removed. Removing from the liquid machine ,
A liquid removal method using the method described in (B) . (B) Double mounted detachably on the rotating part of the centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface and the inner peripheral surface
The cylindrical wall that is narrower toward the top
The top tube-shaped inner tube portion is provided so as to be located inside the wall body.
Inner tank. 3. An object to be treated which has been immersed or impregnated.
A liquid removal device for performing liquid removal processing on members,
An inner tank for loading the member to be treated and an outer tank for accommodating the inner tank.
A centrifugal dewatering machine having a tank and an empty space between the inner tank and the outer tank.
The processing solution that is detachably installed in the gap and centrifugally separated from the inner tank
And a collection tank capable of collecting, as the inner tank
It is characterized by using what is described in the following (A)
Drainage device. (A) Double mounted detachably on rotating part of centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface and the lid, the member to be treated is
Removably mounts with a gap that cannot pass through
An inner tank that can be removed. 4. A dewatering apparatus for performing a dewatering process on a member to be processed which has been subjected to immersion or impregnation, comprising: an inner tank for loading the member to be processed; and an outer tank for accommodating the inner tank. A centrifugal dewatering machine equipped with a collecting tank that is detachably installed in a gap between the inner tank and the outer tank and that can collect the processing liquid centrifugally separated from the inner tank . As a tank
A dewatering apparatus characterized by using one described in the following (B) . (B) Double mounted detachably on the rotating part of the centrifugal dewatering machine
A container having a cylindrical structure, wherein the outer cylindrical portion of the double cylindrical container has a bottom.
It is formed in a cylindrical shape and its inner peripheral surface is upward
It is formed as wide as possible, and the inner cylinder part is formed
Both have openings at the bottom of the bottomed cylindrical outer cylinder.
The inner peripheral surface of the bottomed cylindrical outer cylinder and the bottomed cylindrical inner cylinder
In the gap between the outer peripheral surface and the inner peripheral surface
The cylindrical wall that is narrower toward the top
The top tube-shaped inner tube portion is provided so as to be located inside the wall body.
Inner tank.