CN110806125A

CN110806125A - U-shaped tube heat exchanger baffle plate assembly and fixing and sealing method thereof

Info

Publication number: CN110806125A
Application number: CN201911121690.5A
Authority: CN
Inventors: 曹丽琴; 张红升; 周艳萍; 陈端; 梁鸿; 赵元
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-02-18
Anticipated expiration: 2039-11-15
Also published as: CN110806125B

Abstract

A baffle plate assembly of a U-shaped tube heat exchanger comprises a first baffle plate and a second baffle plate which are alternately arranged on a heat exchange tube from top to bottom, a pull rod penetrating through the inner sides of the edges of the first baffle plate and the second baffle plate, and support tubes which are respectively arranged between each two baffle plates and the tube plates and are externally sleeved on the surfaces of the pull rods; the second baffle plate is positioned at the upper side and the lower side of one end of the U-shaped bent pipe area of the heat exchange pipe, one end of the pull rod is fixed in the pipe plate, and the other end of the pull rod is fixedly connected with the end part of the second baffle plate through nuts. The invention also provides a fixed sealing method of the baffle plate assembly, which comprises the steps of fixing the baffle plate, installing the heat exchange tube, penetrating the cylinder, locking the nut and the like.

Description

U-shaped tube heat exchanger baffle plate assembly and fixing and sealing method thereof

Technical Field

The invention relates to the technical field of heat exchanger equipment, in particular to a U-shaped tube heat exchanger baffle plate assembly and a fixing and sealing method thereof.

Background

The heat exchanger is a device for transferring partial heat of hot fluid to cold fluid, plays an important role in many industrial productions such as chemical industry, petroleum, power, food, nuclear power and the like, and is widely applied. The fixed tube plate heat exchanger has the advantages that the baffle plate is fixedly connected with the cylinder body, the vibration resistance is good, the baffle plate and the cylinder body are sealed, short circuit caused by direct flowing of fluid cannot be caused, the fixed tube plate heat exchanger has the advantages that the baffle plate is fixed on the inner side of the cylinder body, and therefore when dirt on the outer surface of the tube bundle is accumulated, the tube bundle cannot be drawn out for cleaning, and the problem solved by the U-shaped tube heat exchanger is solved.

Each tube of the U-shaped tube heat exchanger is bent into a U shape, an inlet and an outlet are respectively arranged on two sides of the same tube plate, and the end enclosure is divided into two chambers by a partition plate. Each tube is free to telescope independently of its tube and housing. This type of heat exchanger's structure is fairly simple, moreover because there is not the relation of connection (during the installation, earlier with the tube bank, also be exactly after tube sheet, baffling board and the heat exchange tube equipment are accomplished, wholly penetrate the barrel again) between baffling board and the barrel, consequently, when the heat exchange tube surface dirt was too much, can take out the tube bank wholly and wash, the refill barrel after clean.

However, as the baffle plate is not connected with the cylinder, the baffle plate is only fixed by a large number of heat exchange tubes penetrating through the baffle plate, so that the vibration problem is generated, and the vibration problem is a main mode of heat exchanger damage and can generate serious abrasion on the heat exchange tubes. In addition, because no fixation is realized between the baffle plate and the inner wall of the cylinder body, no sealing is realized, and partial shell-side fluid can directly pass through the gap. The purpose of arranging the baffle plate is to ensure that fluid changes direction at the baffle plate and then flows through the heat exchange tube in a cutting mode, so that the heat exchange efficiency is improved. And part of fluid in the U-shaped tube heat exchanger directly passes through a gap between the baffle plate and the inner wall of the cylinder body to cause short circuit, so that the heat efficiency of the heat exchanger is reduced, which is a long-standing technical problem of the U-shaped tube heat exchanger.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a U-tube heat exchanger baffle assembly and a method for fixing and sealing the same, which can not only solve the problem of inconvenient disassembly and cleaning, but also satisfy the sealing effect.

The technical scheme adopted by the invention is as follows:

the invention provides a U-shaped tube heat exchanger baffle assembly, which comprises a first baffle plate and a second baffle plate which are alternately arranged on a heat exchange tube from top to bottom, a pull rod penetrating through the inner sides of the edges of the first baffle plate and the second baffle plate, and support tubes which are respectively arranged between each two baffle plates and the tube plates and are externally sleeved on the surfaces of the pull rods; the second baffle plate is positioned at the upper side and the lower side of one end of the U-shaped bent pipe area of the heat exchange pipe, one end of the pull rod is fixed in the pipe plate, and the other end of the pull rod is fixedly connected with the end part of the second baffle plate through nuts.

Further, the first baffle plate comprises a body and an O-shaped sealing ring nested at the edge of the body.

Furthermore, the first baffle body comprises a flat plate area, a second branch vertically arranged in the middle of the edge of the flat plate area, a first branch and a third branch which are symmetrically arranged on two sides of the second branch and are inclined outwards by a certain angle, and limit strips which are perpendicular to the flat plate area and have a height smaller than the heights of the first branch, the second branch and the third branch are respectively arranged between the first branch and the second branch, and between the second branch and the third branch.

Further, the second baffle plate comprises a body and an O-shaped sealing ring nested at the edge of the body.

Furthermore, the second baffle plate body comprises a flat plate area, a first branch vertically arranged at one end of the edge of the flat plate area, a second branch vertically arranged at the other end of the edge of the flat plate area, and a limiting strip vertically arranged between the first branch and the second branch and having a height smaller than that of the first branch and the second branch.

Furthermore, the outer end part of the limiting strip is arranged to be of an inwards concave arc structure.

Further, the O-shaped sealing ring is made of rubber with an O-shaped cross section.

A method for fixing and sealing a baffle assembly of a U-shaped tube heat exchanger comprises the following steps: step one, baffle plates are sequentially connected by adopting a pull rod, support tubes are adopted to support the baffle plates and the tube plates, the mutual distance is ensured, one end of the pull rod is fixedly connected to the tube plates by adopting threads, and the other end of the pull rod is fixedly connected with the baffle plates close to one side of a U-shaped bent pipe area by adopting nuts; step two, after the parts are fixed, installing heat exchange tubes, and fixing all the heat exchange tubes on the tube plate after penetrating through the baffle plate to form a tube bundle; thirdly, the tube bundle is integrally penetrated into the cylinder, and the tube plate is fixedly connected with the end part of the cylinder; fourthly, an operator enters the side of the U-shaped bent pipe inside the cylinder through the manhole, and screws the nut to enable the nut to be tightly abutted against the side face of the baffle plate; in the screwing process, the pull rod is equivalently pulled outwards, the O-shaped sealing ring is extruded through the conduction of the force of the supporting pipe, the O-shaped sealing ring can only deform outwards due to the limitation of the limiting strip, the O-shaped sealing ring is in close contact with the inside of the cylinder, and when the contact pressure between the O-shaped sealing ring and the cylinder is large enough, the fixing of the baffle plate and the sealing between the baffle plate and the inner wall of the cylinder can be completed.

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

the U-shaped tube heat exchanger baffle assembly and the fixing and sealing method thereof can realize that the baffle of the U-shaped tube heat exchanger is fixed on the cylinder and sealed with the cylinder, are convenient to disassemble and convenient to clean and replace, and ensure that the U-shaped tube heat exchanger has the advantages of fixing the tube plate heat exchanger while keeping the advantages of the U-shaped tube heat exchanger.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a baffle plate assembly of a U-tube heat exchanger according to the present invention;

FIG. 2 is an enlarged view of part I of FIG. 1;

FIG. 3 is an enlarged view of section II of FIG. 1;

FIG. 4 is an enlarged view of part III of FIG. 1;

FIG. 5 is a cross-sectional view of the first baffle plate;

FIG. 6 is a cross-sectional view of the second baffle plate;

FIG. 7 is a schematic view of the structure of the pull rod;

FIG. 8 is a schematic front view of the upper baffle;

FIG. 9 is a schematic front view of the lower baffle.

Wherein, the reference numbers: 1. a first baffle plate; 2. a second baffle plate; 3. a pull rod; 4. supporting a tube; 5. an O-shaped sealing ring; 6. a through hole; 7. a limiting hole; 11. a first baffle plate body; 111. a slab region; 112. a first branch; 113. a second branch; 114. a third branch; 115. a limiting strip; 21. a second baffle plate body; 211. a slab region; 212. a first branch; 213. a second slider; 214. a limiting strip; 31. smoothing the rod piece; 32. a long thread region; 33. a short thread region; 34. a nut; s1, a tube plate; s2, heat exchange tube.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1 to 4, a detailed structure of an embodiment of a U-tube heat exchanger baffle assembly according to the present invention is shown. The baffle plate assembly comprises a first baffle plate 1, a second baffle plate 2, a pull rod 3, a support pipe 4 and an O-shaped sealing ring 5.

The baffle plate assembly is characterized in that baffle plates on the upper side and the lower side of one end, close to the U-shaped bent pipe area, of the baffle plate assembly are second baffle plates, the rest baffle plates are first baffle plates, and the baffle plate on the upper side and the baffle plate on the lower side are identical in structure and symmetrical in direction; in this embodiment, the baffle plate assembly includes three first baffle plates 1 arranged alternately up and down and two second baffle plates 2 arranged alternately up and down on the rightmost side of the first baffle plates 1, the pull rods 3 respectively penetrate through the inner sides of the edges of the upper baffle plate and the lower baffle plate to connect the upper and lower baffle plates in series, and the number and the positions of the pull rods 3 can be adjusted according to actual conditions; referring to fig. 7, the middle area of the pull rod 3 is a smooth rod 31, two ends of the pull rod are respectively a long threaded area 32 and a short threaded area 33, one end of the short threaded area 33 is fixed in the tube plate S1, and one end of the long threaded area 32 is fixedly connected with the second baffle plate 2 through a nut 34, in this embodiment, two nuts 34 are used in a superposed manner at the same position, support tubes 4 are arranged between the first baffle plate 1 and the tube plate S1, between every two first baffle plates 1, between the first baffle plate 1 and the second baffle plate 2, and between every two second baffle plates 2, the support tubes 4 are externally sleeved on the surface of the pull rod 3, and the outer diameter of the support tubes 4 is greater than the inner diameter of the opening of the baffle plate and the outer diameter of the pull rod 3, so as to play a role in supporting, and simultaneously ensure the distance between the; the second baffle plates 2 at the upper side and the lower side are positioned at the rightmost side of the baffle plate assembly and close to one end of the U-shaped bent pipe area of the heat exchange pipe S2.

Referring to fig. 5, the first baffle plate 1 includes a body 11 and two O-ring seals 5 nested at the edge of the body, wherein the first baffle plate body 11 is a unitary structural component, and includes a plate area 111, a second branch 113 vertically disposed at the middle of the edge of the plate area 111, and a first branch 112 and a third branch 114 symmetrically disposed at both sides of the second branch 11 and inclined outward at a certain angle, a stopper strip 115 perpendicular to the plate area 111 and having a height smaller than that of the first branch 112, the second branch 113, and the third branch 114 is disposed between the first branch 112 and the second branch 113, and between the second branch 113 and the third branch 114, and the two O-ring seals 5 are nested between the first branch 112 and the second branch 113, between the second branch 113, and between the third branch 114.

Referring to fig. 6, the second baffle plate 2 comprises a body 21 and an O-ring 5 nested on the edge of the body, wherein the second baffle plate body 21 is a unitary structural member, and comprises a plate section 211, a first branch 212 vertically disposed at one end of the edge of the plate section 211, a second branch 213 disposed at the other end of the edge of the plate section 211 and inclined outward at a certain angle, and a stopper 214 vertically disposed between the first branch 212 and the second branch 213 and having a height smaller than that of the first branch 212 and the second branch 213; the outer ends of the limiting

strips

115 and 214 are both arc-shaped structures bent inwards and used for supporting the O-shaped sealing ring 5; the first branch 212 faces one end of the U-shaped bent pipe area, so that the end face of the nut is tightly attached to the vertical surface of the nut, and the pull rod 3 is locked.

Referring to fig. 8 and 9, through holes 6 are correspondingly and uniformly arranged in the middle areas of the first baffle plate body 11 and the second baffle plate body 21 according to the number of the heat exchange tubes S2, corresponding limiting holes 7 are formed in the inner sides of the edges of the first baffle plate body 11 and the second baffle plate body 21 according to the position and the number of the pull rods 3, in this embodiment, five limiting holes 7 are formed in the inner side of the edge of each baffle plate, and the limiting holes 7 are uniformly arranged in the outer sides of the through holes 6.

The cutting angle of the supporting tube 4 can be determined according to whether the supporting tube is in contact with a tube plate or a baffle plate, and the cutting angle can be calculated according to the compression amount of the O-shaped sealing ring 5; the O-ring 5 is made of rubber with an O-shaped cross section.

A fixed sealing method of a U-shaped tube heat exchanger baffle plate assembly comprises the steps of firstly, connecting a first baffle plate 1 and a second baffle plate 2 in sequence by using a pull rod 3, wherein a support tube 4 is adopted between every two baffle plates and between the baffle plates and a tube plate S1 to support the baffle plates so as to ensure the mutual distance, one end of the pull rod 3 is fixedly connected to the tube plate S1 by adopting threads, and the other end of the pull rod 3 is fixedly connected with the second baffle plate 2 close to one side of a U-shaped bent tube area by adopting a nut 34; step two, after the parts are fixed, installing heat exchange tubes S2, and fixing all the heat exchange tubes on a tube plate S1 after sequentially passing through a second baffle plate 2 and a first baffle plate 1 to form a tube bundle; thirdly, the tube bundle is integrally penetrated into the cylinder, and the tube plate S1 is fixedly connected with the end part of the cylinder; step four, an operator enters the side of the U-shaped bent pipe in the cylinder through the manhole, and screws the nut 34 tightly to enable the nut to be tightly close to the side face of the second baffle plate 2; in the screwing process, the pull rod 3 is pulled outwards equivalently, the O-shaped sealing ring 5 is extruded through the conduction of the force of the supporting tube 4, the O-shaped sealing ring 5 can only deform outwards due to the limitation of the limiting strips 115 and 214, the close line contact with the inside of the cylinder body is realized, and when the contact pressure between the O-shaped sealing ring 5 and the cylinder body is large enough, the fixation of the baffle plate and the sealing between the baffle plate and the inner wall of the cylinder body can be completed.

When the tube bundle needs to be cleaned after a period of operation, the nut 34 is loosened, the contact pressure between the O-shaped sealing ring 5 and the inner wall of the cylinder body is removed, the tube bundle is drawn out to be cleaned, the third step and the fourth step are repeated after the cleaning is finished, and the tube bundle is installed and fixed again; after disassembly and cleaning, the O-shaped sealing rings 5 can be replaced to ensure the sealing effect, and in the process of screwing the nuts 34, in order to ensure that the deformation of the O-shaped sealing rings 5 of each part is approximate, the nuts 34 are gradually screwed in batches instead of screwing off one nut after completely screwing one nut 34, so that the sealing effect reduction caused by uneven stress of the O-shaped sealing rings 5 is avoided.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. A U type heat exchanger baffle subassembly which characterized in that: the baffle plate assembly comprises a first baffle plate and a second baffle plate which are alternately arranged on the heat exchange tube from top to bottom, a pull rod penetrating through the inner sides of the edges of the first baffle plate and the second baffle plate, and support tubes which are respectively arranged between each two baffle plates and the tube plates and are externally sleeved on the surfaces of the pull rods; the second baffle plate is positioned at the upper side and the lower side of one end of the U-shaped bent pipe area of the heat exchange pipe, one end of the pull rod is fixed in the pipe plate, and the other end of the pull rod is fixedly connected with the end part of the second baffle plate through nuts.

2. A U-tube heat exchanger baffle assembly as set forth in claim 1, wherein: the first baffle plate comprises a body and an O-shaped sealing ring nested at the edge of the body.

3. A U-tube heat exchanger baffle assembly as set forth in claim 2, wherein: the first baffle plate body comprises a flat plate area, a second branch, a first branch and a third branch, wherein the second branch is vertically arranged in the middle of the edge of the flat plate area, the first branch and the third branch are symmetrically arranged on two sides of the second branch and are inclined outwards by a certain angle, and limiting strips which are perpendicular to the flat plate area and are smaller than the first branch, the second branch and the third branch in height are respectively arranged between the first branch and the third branch, and the third branch and the second branch are respectively arranged between the first branch and the third branch.

4. A U-tube heat exchanger baffle assembly as set forth in claim 1, wherein: the second baffle plate comprises a body and an O-shaped sealing ring nested at the edge of the body.

5. A tube heat exchanger baffle assembly as set forth in claim 4 wherein: the second baffle plate body comprises a flat plate area, a first branch and a second branch, wherein the first branch is vertically arranged at one end of the edge of the flat plate area, the second branch is arranged at the other end of the edge of the flat plate area, and the limiting strip is vertically arranged between the first branch and the second branch and is smaller than the first branch and the second branch in height.

6. A tube heat exchanger baffle assembly as claimed in claim 3 or 5, wherein: the outer end part of the limiting strip is of an inward-concave arc structure.

7. A U-tube heat exchanger baffle assembly according to any one of claims 2-5, wherein: the O-shaped sealing ring is made of rubber with an O-shaped cross section.

8. The method of claim 7, wherein the method comprises the steps of: the method comprises the following steps:

step one, baffle plates are sequentially connected by adopting a pull rod, support tubes are adopted to support the baffle plates and the tube plates, the mutual distance is ensured, one end of the pull rod is fixedly connected to the tube plates by adopting threads, and the other end of the pull rod is fixedly connected with the baffle plates close to one side of a U-shaped bent pipe area by adopting nuts;

step two, after the parts are fixed, installing heat exchange tubes, and fixing all the heat exchange tubes on the tube plate after penetrating through the baffle plate to form a tube bundle;

thirdly, the tube bundle is integrally penetrated into the cylinder, and the tube plate is fixedly connected with the end part of the cylinder;

fourthly, an operator enters the side of the U-shaped bent pipe inside the cylinder through the manhole, and screws the nut to enable the nut to be tightly abutted against the side face of the baffle plate; in the screwing process, the pull rod is equivalently pulled outwards, the O-shaped sealing ring is extruded through the conduction of the force of the supporting pipe, the O-shaped sealing ring can only deform outwards due to the limitation of the limiting strip, the O-shaped sealing ring is in close contact with the inside of the cylinder, and when the contact pressure between the O-shaped sealing ring and the cylinder is large enough, the fixing of the baffle plate and the sealing between the baffle plate and the inner wall of the cylinder can be completed.