CN115531959B

CN115531959B - Sewage treatment equipment

Info

Publication number: CN115531959B
Application number: CN202211479963.5A
Authority: CN
Inventors: 李强; 肖勇; 耿红磊; 蒋德晓; 赵秀秀; 刘希法; 徐焱焱; 徐丹
Original assignee: Zhonghai Shandong Purification Engineering Co ltd
Current assignee: Zhonghai Shandong Purification Engineering Co ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-03-14
Anticipated expiration: 2042-11-24
Also published as: CN115531959A

Abstract

The invention relates to the technical field of sewage treatment, in particular to sewage treatment equipment. The sewage treatment equipment guides sewage and garbage to the outer edge through the upper side of the filter plate, guides the sewage and the garbage to the inner edge through the lower side of the filter plate, so that the advancing path of the garbage on the surface of the filter plate is prolonged, the separation of water in the garbage is assisted by matching with the rolling process from top to bottom and from outside to inside, the fins perform tangential precession in the cylinder, and the air on the outer ring can be extruded to the inner side of the fins after the fins rotate due to the fact that the inclination angle of the fins and the advancing tangential direction form a positive attack angle, and gradually attenuates along with the tangential speed, so that the air flow moves towards the center in an arc line, and the garbage on the surface of the filter plate can be blown to the center of the cylinder in the process that the air flow enters the inner side from the outer side of the filter plate, so that the self-cleaning of the filter plate is performed, the garbage collection is realized at the same time, and the subsequent treatment is convenient.

Description

Sewage treatment equipment

Technical Field

The invention relates to the technical field of sewage treatment, in particular to sewage treatment equipment.

Background

Contain a large amount of chemical impurity and physical impurity in the medical sewage, chemical impurity includes that various medicines remain and the virus bacterium remains, physical impurity then includes if medical waste such as cotton swab, adhesive tape, at the in-process of actual processing, not only need clear away the separation to chemical impurity, still need carry out the filter sieve to physical impurity and separate, after complete processing flow, just can discharge medical sewage, in order to reach the purpose that reduces environmental pollution.

The prior patent (publication number: CN 114405099B) discloses a medical sewage treatment device, and relates to the field of sewage treatment equipment. The power distribution box comprises a box body, be provided with the baffle in the box, the baffle separates the box internal part for crossing filter bin and processing storehouse, set up the through-hole that runs through the baffle on the baffle, cover in the through-hole and be equipped with the filter plate, set up the connecting hole with the through-hole intercommunication on the lateral wall of box, it is provided with the connecting plate to slide in the connecting hole, one side and filter plate fixed connection that the connecting plate is close to the through-hole, be provided with the shrouding on the box, the shrouding is used for sealing the connecting hole, cross the equal opening in top setting in filter bin and processing storehouse, this application has the healthy effect of guarantee staff change filter plate in-process, but the filter component of this equipment is the plane setting, influences filtering quality because of the stand easily on the one hand, and on the other hand needs artifical regular cleaning, and is inconvenient to use.

In view of this, we propose a sewage treatment apparatus.

Disclosure of Invention

The invention aims to provide sewage treatment equipment, which aims to solve the problems that the filtering part is arranged in a plane, so that the filtering performance is easily influenced by spreading on one hand, and the filtering part needs to be cleaned regularly by manpower and is inconvenient to use on the other hand. In order to achieve the purpose, the invention provides the following technical scheme: the sewage treatment equipment comprises a shell, wherein the shell is of a hollow pipe structure, the upper end and the lower end of the shell are both contracted into conical pipes, flanges are fixedly arranged at the two ends of each conical pipe, and the shell is arranged on a sewage pipeline through the flanges.

The inside upper end fixed mounting of shell has bent cover, and the bent runner that moves towards around having seted up on the cover, the runner is with the sewage of upside input to both sides reposition of redundant personnel direction around in the shell.

The middle position in the shell is provided with a self-propelled filter driven by sewage.

Preferably, the self-propelled filter element comprises a cylinder movably arranged in the shell, a plurality of filter plates and a plurality of filter plates are fixedly connected to the inner side of the cylinder, the filter plates are distributed along the cylinder in an annular equidistant mode, and the filter plates are obliquely arranged along the cylinder.

The filter plate is close to the cylinder axis and is set as an inner edge, the filter plate is set as an outer edge when deviating from the cylinder axis, one surface of the filter plate facing the upper side is set as a positive surface, and one surface of the filter plate facing the lower side is set as a negative surface.

The inner edge of the upper side of the filter plate tends to deflect on the positive side, and the outer edge of the upper side of the filter plate tends to deflect on the negative side.

The inner edge of the lower side of the filter plate tends to deflect at the negative side, and the outer edge of the lower side of the filter plate tends to deflect at the positive side.

And the filter plate, the cylinder and the shell are provided with plate cleaning components.

Preferably, clear board subassembly is including seting up at the inside annular of shell, and is provided with the lantern ring in the annular, the fixed cover of lantern ring is connected on the surface of drum, and sets up intercommunication annular and the inside interior gas vent of drum on lantern ring and the drum, the outer gas vent with the annular intercommunication is seted up on the surface of shell.

The filter plate is characterized in that fins are fixedly connected between every two adjacent filter plates, the fins are vertically arranged along the axial direction of the cylinder, the fins are obliquely arranged along the radial direction of the cylinder at a negative attack angle, and the fins are at a positive attack angle along the precession tangent line of the filter plates.

An outer communicating piece corresponding to the exhaust direction of the fins is arranged in the shell.

Preferably, outer logical piece is including being the axle sleeve of upper and lower sliding connection in the annular, and the bottom of annular is provided with the spring, the spring promotes the axle sleeve and shifts up, the lantern ring rotates the inside of connecting at the axle sleeve.

The upper side fixed mounting of shell inside has the return bend, and the upper end of return bend is worn out, the lower extreme is located the array center department of a plurality of filter plate from the shell.

The filter plate comprises a plurality of filter plates, a fixed disc is fixedly connected to the inner edge of the bottom of each filter plate, a rotating disc is rotatably connected to the bottom of each fixed disc, a hose is fixedly mounted on the lower side of the inside of a shell, and the upper end of each hose is fixedly connected with the corresponding rotating disc, and the lower end of each hose penetrates out of the shell.

When the shaft sleeve, the cylinder, the filter plate and the chassis are positioned on the upper position, the fixed disc, the rotating disc and the hose are abutted against the bent pipe.

Preferably, the housing is composed of two parts, an upper half shell and a lower half shell.

Preferably, the upper end and the lower end of the cylinder are both inclined to form inward conical openings.

Preferably, the lantern ring and the cylinder are fixedly connected through a screw.

Preferably, the inner edges of the surfaces of the filter plate and the fins are close to the outer surface of the upper bent pipe.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the filter plate is obliquely arranged, and the filtered garbage can roll down along the front surface of the filter plate, so that the garbage is stacked at the bottommost part, and the garbage can be prevented from spreading on the filter plate to influence the filtering performance.

In the invention, in the process that sewage and garbage move downwards along the filter plate, the upper side of the filter plate guides the sewage and the garbage to the outer edge, and when the sewage and the garbage move downwards along with the deflected plate surface, the lower side of the filter plate guides the sewage and the garbage to the inner edge, so that the travel path of the garbage on the surface of the filter plate is prolonged, and the separation of water in the garbage is assisted by matching with the rolling process from top to bottom and from outside to inside.

According to the invention, tangential precession is carried out in the cylinder through the fins, and because the inclination angle of the fins and the advancing tangential direction form a positive attack angle, air on the outer ring can be extruded into the cylinder after the fins rotate, external air is sucked along the inner hole on the cylinder and the inner hole in the annular groove, and is gradually attenuated along with the tangential speed, so that the air flow moves towards the center in an arc line, and garbage on the surface of the filter plate can be blown to the center of the cylinder in the process that the air flow enters the inner side from the outer side of the filter plate, so that self-cleaning of the filter plate is carried out, and meanwhile, the garbage collection is realized, and the subsequent treatment is facilitated.

In the invention, the whole cylinder is weighted and moves downwards through the lantern ring and the shaft sleeve compression spring, at the moment, the filter plate, the fixed disc, the rotating disc and the hose at the bottom synchronously move downwards, the space at the center of the filter plate array is opened, and in the process of cleaning the filter plate by guiding airflow by the fins, the peripheral airflow carries garbage along the same arc-shaped path to reach the center to form vortex and moves towards the upper end and the lower end, so that the garbage is blown into the bent pipe and the hose to be discharged, in the process, larger garbage is influenced by gravity and more easily enters the hose downwards, and smaller garbage is more easily blown into the bent pipe upwards by the airflow, so that the garbage is rapidly screened.

In the invention, in the process of falling sewage to the filter plate, the sewage impacts the filter plate and pushes the filter plate and the cylinder to rotate along the deflected filter plate, and at the moment, a plurality of filter plates perform alternate intermittent water filtration under water outlet points at two sides, so that on one hand, sufficient water filtration time can be reserved for the filter plates, and on the other hand, the separation of water can be accelerated by using the centrifugal force of rotation.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a front cross-sectional view of the present invention;

FIG. 3 is a perspective sectional view of the present invention;

FIG. 4 is an exploded view of FIG. 3 of the present invention;

FIG. 5 is a partial exploded view of FIG. 4 in accordance with the present invention;

FIG. 6 is a perspective sectional view of the cylinder of FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic perspective view of the filter plate of FIG. 6 according to the present invention;

fig. 8 is a schematic perspective view of the fin of fig. 6 according to the present invention.

In the figure: 1. a housing; 2. a taper pipe; 3. a flange plate; 4. a curved cover; 5. a flow channel; 6. a self-propelled filter element; 61. a cylinder; 62. filtering the plate; 63. cleaning the plate assembly; 631. a ring groove; 632. a collar; 633. an inner air hole; 634. an outer air hole; 635. a fin; 636. an outer through piece; 6361. a shaft sleeve; 6362. a spring; 6363. bending the pipe; 6364. fixing the disc; 6365. rotating the disc; 6366. a hose.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by workers skilled in the art from the embodiments given herein without making creative efforts, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 8, the present invention provides a technical solution: a sewage treatment device comprises a shell 1, wherein the shell 1 is of a hollow pipe structure, the upper end and the lower end of the shell 1 are both bundled into conical pipes 2, the conical pipes 2 at the two ends are both fixedly provided with flange plates 3, and the shell 1 is arranged on a sewage pipeline through the flange plates 3;

a curved cover 4 is fixedly installed at the upper end inside the shell 1, a flow channel 5 with a front-back trend is formed in the curved cover 4, the flow channel 5 guides sewage input from the upper side to the front and back sides in the shell 1 in a shunting manner, the sewage flows into the shell 1 from the upper side conical pipe 2, and the flow channel 5 guides the sewage input from the upper side to the front and back sides in a shunting manner in the shell 1;

the middle position in the shell 1 is provided with a self-propelled filter element 6 driven by sewage.

In the embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 to fig. 8, the self-pushing filter element 6 includes a cylinder 61 movably disposed in the housing 1, and a plurality of filter plates 62 are fixedly connected to the inner side of the cylinder 61, the plurality of filter plates 62 are distributed along the cylinder 61 at equal intervals in a ring shape, and the filter plates 62 are disposed along the cylinder 61 in an inclined manner, so that the sewage firstly falls to the upper side of the front face of the filter plate 62, and the filter plates 62 are disposed in an inclined manner, and the garbage filtered at this time can fall down along the front face, so as to stack the garbage at the bottom;

the filter plate 62 is arranged as an inner edge near the axis of the cylinder 61, and the filter plate 62 is arranged as an outer edge far away from the axis of the cylinder 61, the surface of the filter plate 62 facing the upper side is arranged as a front surface, and the surface of the filter plate 62 facing the lower side is arranged as a negative surface;

the inner edge of the upper side of the filter plate 62 tends to deflect on the front side, and the outer edge of the upper side of the filter plate 62 tends to deflect on the negative side;

the inner edge of the lower side of the filter plate 62 tends to deflect towards one side in the negative direction, the outer edge of the lower side of the filter plate 62 tends to deflect towards one side in the positive direction, in the process that sewage and garbage move downwards along the filter plate 62, the upper side of the filter plate 62 guides the sewage and the garbage towards the outer edge, and when the sewage and the garbage move downwards along the deflected plate surface, the lower side of the filter plate 62 guides the sewage and the garbage towards the inner edge, so that the advancing path of the garbage on the surface of the filter plate 62 is prolonged, in the process that the sewage falls to the filter plate 62, the sewage impacts the filter plate 62 and pushes the filter plate 62 and the cylinder 61 to rotate along the deflected filter plate 62, and at the moment, a plurality of filter plates 62 perform alternate intermittent water filtration under the water outlet points at the two sides;

the filter plate 62, the cylinder 61 and the housing 1 are provided with a plate cleaning assembly 63.

In this embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 to fig. 8, the plate cleaning assembly 63 includes a ring groove 631 formed inside the housing 1, a collar 632 is disposed inside the ring groove 631, the collar 632 is fixedly secured to the surface of the cylinder 61, the collar 632 and the cylinder 61 are provided with an inner hole 633 for communicating the ring groove 631 with the inside of the cylinder 61, and the surface of the housing 1 is provided with an outer hole 634 for communicating with the ring groove 631;

the fins 635 are fixedly connected between the two adjacent filter plates 62, the fins 635 are vertically arranged along the axial direction of the cylinder 61, the fins 635 are obliquely arranged along the radial direction of the cylinder 61 at a negative attack angle, the fins 635 are rotated at a positive attack angle along the screwing tangent of the filter plates 62, the fins 635 are rotated at a tangent in the cylinder 61, and the inclination angle of the fins 635 and the advancing tangent direction form the positive attack angle, so that the fins 635 rotate to extrude air on the outer ring to the inner side of the fins 635 and suck external air along the inner air holes 633 on the cylinder 61 and the inner air holes 633 in the ring groove 631, the air flow gradually attenuates with the tangential speed, the air flow moves towards the center in an arc line, and in the process that the air flow enters the inner side from the outer side of the filter plates 62, the garbage on the surfaces of the filter plates 62 can be blown to the center of the cylinder 61;

an external communication member 636 corresponding to the exhausting direction of the fins 635 is provided in the housing 1.

In this embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 to fig. 8, the external communication member 636 includes a sleeve 6361 connected in the annular groove 631 in a sliding manner, and a spring 6362 is disposed at the bottom of the annular groove 631, the spring 6362 pushes the sleeve 6361 to move upward, and the collar 632 is rotatably connected inside the sleeve 6361;

an elbow 6363 is fixedly installed on the upper side inside the housing 1, the upper end of the elbow 6363 penetrates out of the housing 1, and the lower end is located at the center of the array of the plurality of filter plates 62;

a fixed disc 6364 is fixedly connected to the inner edges of the bottoms of the plurality of filter plates 62, a rotating disc 6365 is rotatably connected to the bottom of the fixed disc 6364, a hose 6366 is fixedly mounted on the lower side inside the housing 1, the upper end of the hose 6366 is fixedly connected with the rotating disc 6365, and the lower end of the hose passes through the housing 1;

when the sleeve 6361, the cylinder 61, the filter plate 62 and the base plate are positioned at the upper position, the fixed disk 6364, the rotary disk 6365 and the hose 6366 are abutted against the elbow 6363.

In this embodiment, as shown in fig. 1, 2, 3, 4, 5 to 8, the housing 1 is composed of an upper half-shell and a lower half-shell, which are fixed by a connector such as a bolt or a hoop, and the lower half-shell and the filter plate 62 inside can be manually cleaned after the upper half-shell and the elbow 6363 are separated.

In this embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 to fig. 8, the upper and lower ends of the cylinder 61 are both inclined to form inward tapered openings, so that the sewage or garbage can be prevented from accumulating at the top edge of the cylinder 61.

In this embodiment, as shown in fig. 1, 2, 3, 4, and 5 to 8, the collar 632 and the cylinder 61 are fixedly connected by screws, and the both are effectively and conveniently detached by screw connection, which further facilitates replacement and inspection of the cylinder 61 and internal components.

In this embodiment, as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 to fig. 8, the inner edges of the surfaces of the filter plate 62 and the fin 635 are close to the outer surface of the upper bent tube 6363, so that the filter plate 62 and the fin 635 are prevented from being influenced by the bent tube 6363 during rotation, and meanwhile, the garbage can be prevented from leaking out from the gap between the filter plate 62 and the fin 635 and the bent tube 6363.

The use method and the advantages of the invention are as follows: when the sewage treatment equipment works and is used, the working process is as follows:

as shown in fig. 1, 2, 3, 4, 5 to 8:

s1, the device is arranged on a sewage pipeline through a flange 3, sewage flows into a shell 1 from an upper side taper pipe 2, at the moment, a flow channel 5 divides and guides the sewage input from the upper side to the front side and the rear side in the shell 1 and impacts a filter plate 62 on the lower side, solid garbage in the sewage is separated through the filter plate 62, and then liquid is discharged for subsequent treatment;

s2, in the process of treating sewage by the filter plate 62, the sewage firstly falls to the upper side of the front surface of the filter plate 62, and as the filter plate 62 is obliquely arranged, the filtered garbage can roll down along the front surface of the filter plate 62, so that the garbage is stacked at the bottommost part, the garbage can be prevented from spreading on the filter plate 62 to influence the filtering performance, in the process of moving the sewage and the garbage downwards along the filter plate 62, the upper side of the filter plate 62 guides the sewage and the garbage to the outer edge, and when the sewage and the garbage move to the lower side along with the deflected plate surface, the lower side of the filter plate 62 guides the sewage and the garbage to the inner edge, so that the traveling path of the garbage on the surface of the filter plate 62 is prolonged;

s3, in the process that the sewage falls to the filter plates 62, the sewage impacts the filter plates 62 and pushes the filter plates 62 and the cylinders 61 to rotate along the deflected filter plates 62, and at the moment, a plurality of filter plates 62 perform alternate intermittent water filtration under water outlet points on two sides;

s4, after the filter plate 62 drives the cylinder 61 to rotate, the fins 635 in the cylinder 61 synchronously rotate, at the moment, the fins 635 are spirally advanced in the cylinder 61 in a tangent line mode, and because the inclination angle of the fins 635 and the advancing tangent direction form a positive attack angle, the fins 635 can extrude air on the outer ring into the inner side of the fins 635 after rotating, external air is sucked along the inner hole 633 on the cylinder 61 and the inner hole 633 in the ring groove 631 and gradually attenuated along the tangent speed, so that the air flow moves towards the center in an arc line mode, and garbage on the surface of the filter plate 62 can be blown to the center of the cylinder 61 in the process that the air flow enters the inner side from the outer side of the filter plate 62;

s5, along with the gradual increase of the quality of the garbage on the filter plates 62, the whole cylinder 61 is weighted and compresses the spring 6362 to move downwards through the lantern ring 632 and the shaft sleeve 6361, at the moment, the filter plates 62, the fixed disc 6364, the rotating disc 6365 and the hose 6366 at the bottom synchronously move downwards, the space at the center of the array of the filter plates 62 is opened, and in the process that the fins 635 guide the airflow to clean the filter plates 62, the peripheral airflow carries the garbage to the center in the same arc-shaped path to form vortex, and moves towards the upper end and the lower end, so that the garbage is blown into the bent pipe 6363 and the hose 6366 to be discharged.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A sewage treatment device, comprising a housing (1), characterized in that: the sewage treatment device is characterized in that the shell (1) is of a hollow pipe structure, the upper end and the lower end of the shell (1) are both bundled into conical pipes (2), the conical pipes (2) at the two ends are both fixedly provided with flange plates (3), and the shell (1) is arranged on a sewage pipeline through the flange plates (3);

a curved cover (4) is fixedly arranged at the upper end inside the shell (1), a flow channel (5) moving forwards and backwards is formed in the curved cover (4), and the flow channel (5) guides sewage input from the upper side to the front side and the back side in the shell (1) in a shunting manner;

a self-propelled filtering piece (6) driven by sewage is arranged in the middle position in the shell (1);

the self-pushing filter element (6) comprises a cylinder (61) movably arranged in the shell (1), the inner side of the cylinder (61) is fixedly connected with a plurality of filter plates (62), the filter plates (62) are distributed in an annular and equidistant manner along the cylinder (61), and the filter plates (62) are obliquely arranged along the cylinder (61);

the filter plate (62) is arranged at the position close to the axis of the cylinder (61) to form an inner edge, the position of the filter plate (62) departing from the axis of the cylinder (61) is arranged as an outer edge, the surface of the filter plate (62) facing the upper side is arranged as a positive surface, and the surface of the filter plate (62) facing the lower side is arranged as a negative surface;

the inner edge of the upper side of the filter plate (62) tends to deflect at the positive side, and the outer edge of the upper side of the filter plate (62) tends to deflect at the negative side;

the inner edge of the lower side of the filter plate (62) tends to deflect at the negative side, and the outer edge of the lower side of the filter plate (62) tends to deflect at the positive side;

the filter plate (62), the cylinder (61) and the shell (1) are provided with a plate cleaning component (63);

the plate cleaning assembly (63) comprises a ring groove (631) formed in the shell (1), a sleeve ring (632) is arranged in the ring groove (631), the sleeve ring (632) is fixedly sleeved on the surface of the cylinder (61), inner air holes (633) communicated with the ring groove (631) and the cylinder (61) are formed in the sleeve ring (632) and the cylinder (61), and outer air holes (634) communicated with the ring groove (631) are formed in the surface of the shell (1);

a fin (635) is fixedly connected between every two adjacent filter plates (62), the fin (635) is vertically arranged along the axial direction of the cylinder (61), the fin (635) is obliquely arranged along the radial direction of the cylinder (61) at a negative attack angle, and the fin (635) is at a positive attack angle along the precession tangent line of the filter plates (62);

an external communicating piece (636) corresponding to the exhaust direction of the fins (635) is arranged in the shell (1).

2. The sewage treatment apparatus according to claim 1, wherein: the outer through piece (636) comprises a shaft sleeve (6361) which is connected in the ring groove (631) in an up-and-down sliding manner, a spring (6362) is arranged at the bottom of the ring groove (631), the spring (6362) pushes the shaft sleeve (6361) to move upwards, and the lantern ring (632) is rotatably connected inside the shaft sleeve (6361);

an elbow (6363) is fixedly installed on the upper side inside the shell (1), the upper end of the elbow (6363) penetrates out of the shell (1), and the lower end of the elbow (6363) is located at the center of the array of the plurality of filter plates (62);

the inner edges of the bottoms of the filter plates (62) are fixedly connected with fixed discs (6364), the bottoms of the fixed discs (6364) are rotatably connected with rotating discs (6365), hoses (6366) are fixedly mounted on the lower side inside the shell (1), the upper ends of the hoses (6366) are fixedly connected with the rotating discs (6365), and the lower ends of the hoses (6366) penetrate out of the shell (1);

when the shaft sleeve (6361), the cylinder (61), the filter plate (62) and the chassis are positioned at an upper position, the fixed disc (6364), the rotating disc (6365) and the hose (6366) are abutted against the elbow pipe (6363).

3. The sewage treatment apparatus according to claim 1, wherein: the shell (1) is composed of an upper half shell and a lower half shell.

4. The sewage treatment apparatus according to claim 1, wherein: the upper end and the lower end of the cylinder (61) are both inclined into inward conical openings.

5. The sewage treatment apparatus according to claim 1, wherein: the lantern ring (632) is fixedly connected with the cylinder (61) through screws.

6. The sewage treatment apparatus according to claim 1, wherein: the inner edges of the surfaces of the filter plate (62) and the fin (635) are close to the outer surface of the upper bent pipe (6363).