CN214470261U - Plate-fin heat exchanger of brazing clamp pipe - Google Patents

Abstract

The plate-fin heat exchanger comprises a plate bundle body (1), wherein the plate bundle body (1) is formed by alternately stacking two or more layers of channel units, and is characterized in that: at least one of the two or more layer channel units is a layer channel unit (11), and the layer channel unit (11) comprises a plurality of straight pipes (111), a plurality of brackets (112) and a plurality of connecting strips (113); the straight pipe (111) is clamped by the bracket (112) from two sides; the connecting strips (113) are linear battens and are embedded between the adjacent brackets (112); the plurality of brackets (112) and the plurality of connecting strips (113) are spliced to form a plate-shaped body; after the integral brazing forming, two sides of the connecting strip (113) are respectively brazed and connected with the adjacent layer channel units, so that the straight pipe (111) is clamped and fixed by the bracket (112), and the whole pipe layer channel unit (11) is integrated.

Description

Plate-fin heat exchanger of brazing clamp pipe

Technical Field

The utility model relates to a plate-fin heat exchanger, concretely relates to plate-fin heat exchanger of double-layered pipe of brazing.

Background

The plate-fin heat exchanger is a high-efficiency heat exchanger using fins as heat transfer elements, and has the characteristics of high heat transfer efficiency, compact structure, expandable heat exchange channel number, large adaptability, light weight and the like, so that the plate-fin heat exchanger is widely applied to heat exchange equipment with two or more of gas-gas, gas-liquid and liquid-liquid, and is generally applied to the field of air separation equipment at present.

In the prior art, reference can be made to the technical standard "NB/T47006-2019 aluminum plate-fin heat exchanger", the standard plate-fin heat exchanger is composed of accessories such as a plate bundle body, a seal head, a connecting pipe, a support and the like, and the plate bundle body is formed by alternately stacking and integrally brazing two or more layer channel units. Taking two layers of channel units as examples, the first layer channel unit and the second layer channel unit are composed of fins, flow deflectors, seals and partition plates, fluid inlets and outlets of the two layer channel units are led out from the circumferential side edges of the two layer channel units in different directions, then upper seal heads are welded on the side portions of the plate bundle body along the thickness direction to accommodate the fluid inlets and the fluid outlets of the same layer channel units, and respective connecting pipes are welded on the seal heads to serve as a total inlet and an outlet, so that the heat exchanger is formed.

However, because the channel of the existing plate-fin heat exchanger is composed of aluminum fins, the strength of the aluminum material is obviously reduced at the temperature of more than 60 ℃, and the aluminum material is also not corrosion-resistant, so that the existing plate-fin heat exchanger is not pressure-resistant, high temperature-resistant, corrosion-resistant and easy to block, can bear 15Mpa at most, and is limited in use occasions. Therefore, coil heat exchangers with high cost and much lower heat transfer efficiency can be adopted in the market under the conditions of high pressure, high temperature or corrosive fluid.

Disclosure of Invention

The utility model aims at providing a plate fin heat exchanger of double-layered pipe of brazing makes it be applicable to high pressure, high temperature or corrosive fluids on the basis that has former plate fin heat exchanger's high heat exchange efficiency advantage.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a plate-fin heat exchanger with a brazed tube comprises a plate bundle body formed by integral brazing, wherein the plate bundle body is formed by alternately superposing two or more layer channel units; at least one of the two or more layer channel units is a layer channel unit, and the layer channel unit comprises a plurality of straight pipes, a plurality of brackets and a plurality of connecting strips; the straight pipes are arranged in parallel on a plane, one end of each straight pipe is connected with the collecting inlet in parallel, the other end of each straight pipe is connected with the collecting outlet in parallel, and the pipe cavities of the straight pipes are in a parallel structure; each support is arranged corresponding to a straight pipe, and specifically each support is composed of two support strips arranged face to face, grooves are formed in the opposite faces of the support strips corresponding to the straight pipes, the straight pipes are accommodated in the grooves of the support strips arranged face to face, namely the straight pipes are clamped by the supports from the two faces; the connecting strip is a linear batten and is embedded between the adjacent brackets; the plurality of brackets and the plurality of connecting strips are spliced to form a plate-shaped body; after the integral brazing molding, two sides of the connecting strip are respectively brazed with the adjacent layer channel units, so that the straight pipe is clamped and fixed by the support, and the whole layer channel unit becomes a whole.

In the scheme, before the integral brazing forming, brazing foils are arranged between opposite surfaces of the support strips and in the grooves of the support strips, the straight pipes are made of brazing materials or the surfaces of the straight pipes are subjected to plating treatment, and after the integral brazing forming is carried out, the groove walls of the support strips and the straight pipes and the two support strips are connected in a brazing mode.

Based on above technical scheme, the utility model discloses following advantage and effect have:

the utility model discloses breakthroughly reform transform a layer channel unit in the current plate-fin heat exchanger into a tube layer channel unit mainly composed of straight tubes, the pressure resistance of the tube structure of the straight tubes is improved, and the smooth tube wall inside the tube structure can resist deposition and is not easy to block; moreover, the straight pipe is fixed in a clamping mode through the bracket, so that brazing is not required to be considered in the selection of the material of the straight pipe, the selection range of the material of the straight pipe is greatly widened, and materials (such as copper materials, high-temperature-resistant plastics, stainless steel, titanium and the like) other than aluminum can be adopted, so that the pressure resistance, the temperature resistance or the corrosion resistance of the straight pipe can be further improved. When in use, high-temperature, high-pressure or corrosive fluid can be introduced into the tube layer channel unit, and the application range is successfully expanded on the basis of having the advantage of high heat exchange efficiency of the original plate-fin heat exchanger.

Besides, other parts (bracket strips and connecting strips) are strip-shaped bodies with equal cross sections except for straight pipes in the pipe layer channel unit, and can be made of sectional materials, so that the pipe layer channel unit is convenient to manufacture and low in cost.

Drawings

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

FIG. 2 is a schematic perspective view of a first-tube channel unit according to an embodiment of the present invention;

FIG. 3 is an exploded view of a first-tube channel unit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a common layer channel unit according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a second embodiment of the present invention.

In the above drawings: 1. a plate bundle body; 11. a tube layer channel unit; 111. a straight pipe; 112. a support; 1121. a stent strip; 11211. a groove; 113. a connecting strip; 12. a common layer channel unit; 121. a fin; 122. a flow deflector; 123. a seal; 124. a partition plate; 2. sealing the end; 3. a separator.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows: referring to FIGS. 1-4:

a plate-fin heat exchanger of a brazing pipe clamp comprises a plate bundle body 1 formed by integral brazing and a seal head 2 arranged on the plate bundle body 1.

Referring to fig. 1 to 4, the plate bundle body 1 is formed by alternately stacking two or more layer channel units, at least one of the two or more layer channel units is a tube layer channel unit 11, and the other channel units are common layer channel units 12 formed by fins 121, flow deflectors 122, seals 123 and partition plates 124, as shown in fig. 4.

Referring to fig. 1 to 4, the tube layer channel unit 11 includes a plurality of straight tubes 111, a plurality of brackets 112, and a plurality of connecting strips 113.

The straight tubes 111 are arranged in parallel on a plane, one end of each straight tube is connected in parallel with the inlet, the other end of each straight tube is connected in parallel with the outlet, and the tube cavities of the straight tubes are in parallel connection. The number of the collecting inlets and the collecting outlets can be one or more, that is, each straight pipe of the pipe layer channel unit 11 can be connected in parallel with the same collecting inlet or connected with a plurality of collecting inlets, so that each straight pipe 111 of the pipe layer channel unit 11 forms a group to be used for running the same medium, or each straight pipe of the pipe layer channel unit 11 is divided into two groups or three groups to be used for running different media. In FIGS. 1 to 4, the summary inlet and the summary outlet are omitted and not shown.

Each support 112 is arranged corresponding to the straight tube 111, specifically, each support 112 is composed of two support strips 1121 arranged face to face, a groove 11211 is formed on the opposite surface of each support strip 1121 corresponding to the straight tube 111, the straight tube 111 is accommodated in the groove 11211 of the support strips arranged face to face, that is, the straight tube 111 is clamped by the supports 112 from two sides; the connecting bars 113 are linear bars, which are embedded between the adjacent brackets 112, and the brackets 112 and the connecting bars 113 are spliced to form a plate-shaped body. After the integral brazing forming, two sides of the connecting strip 113 are respectively brazed with the adjacent layer channel units, so that the straight pipe 111 is clamped and fixed by the bracket 112, and the whole pipe layer channel unit 11 becomes an integral body.

At this time, the connecting bars 113 are used for connecting and supporting, and by limiting the relative positions of the support bars 1121, the support bars 1121 are used for clamping and fixing the straight tube 111, and a small amount of clearance may exist between the groove walls of the grooves 11211 of the support bars 1121 and the tube wall of the straight tube 111, and heat-conducting glue may also be filled therebetween. The connection strip 113 and the bracket strip 1121 may be directly abutted against each other or connected by brazing after a brazing foil is provided.

Specifically, the partition plates 124 of the common layer channel unit 12 are composite plates with brazing foils on both sides, so after brazing, both sides of the connecting strip 113 are brazed to the partition plates 124 of the adjacent layer channel unit, the outer side surfaces of the support strips 1121 of the support 112 are also brazed to the partition plates 124 of the adjacent layer channel unit, and the straight tubes 111 are clamped and fixed by the support 112 from both sides, so that the entire tube layer channel unit 11 becomes a whole.

In order to further improve the heat transfer efficiency and the fixing reliability, before the integral brazing forming, brazing foils are arranged between the opposite surfaces of the support strips 1121 and in the grooves 11211 thereof, and the straight tube 111 is made of a material capable of being brazed or the surface of the straight tube 111 is subjected to plating treatment, after the integral brazing forming, the groove walls 11211 of the support strips and the straight tube 111 and the two support strips 1121 are brazed and connected, so that the heat (or cold) of the straight tube 111 can be directly transmitted to the support strips 1121.

When the layer channel unit at the outer side of the whole plate-fin heat exchanger is the tube layer channel unit 11, a layer of partition plate 3 is additionally arranged on the outer side surface of the tube layer channel unit 11 at the outermost side.

The straight tube 111 of the present embodiment is made of a material (such as copper, high temperature plastic, stainless steel, titanium, etc.) other than aluminum without considering brazing, so as to further improve the pressure resistance, temperature resistance, or corrosion resistance. When in use, high-temperature, high-pressure or corrosive fluid can be introduced into the straight pipe 111 of the pipe layer channel unit 11, and low-pressure fluid without special requirements can be introduced into the common layer channel unit 12, namely, the application range is successfully expanded on the basis of having the advantage of high heat exchange efficiency of the original plate-fin heat exchanger.

Example two: referring to FIG. 5:

the plate-fin heat exchanger with the brazed and clamped tube comprises a plate bundle body 1 formed by integral brazing and a seal head 2 arranged on the plate bundle body 1, and is different from the embodiment in that: the straight tube 111 is formed by a plurality of straight tubes which are arranged side by side and lean together, specifically, four straight tubes which lean together are formed into a group. The brackets 112 and the straight tubes 111 are arranged in a one-to-many manner, for example, in fig. 5, one is a pair of four, and the number of the grooves 11211 on the bracket strip 1121 of each bracket 112 is four, and the four grooves are opposite to the four straight tubes 111 which are leaned together.

The rest is the same as the first embodiment, and is not described herein again.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (2)

1. The plate-fin heat exchanger comprises a plate bundle body (1) formed by integral brazing, wherein the plate bundle body (1) is formed by alternately superposing two or more than two layers of channel units, and is characterized in that:

at least one of the two or more layer channel units is a layer channel unit (11), and the layer channel unit (11) comprises a plurality of straight pipes (111), a plurality of brackets (112) and a plurality of connecting strips (113); the straight pipes (111) are arranged in parallel on a plane, one end of each straight pipe (111) is connected with the collecting inlet in parallel, and the other end of each straight pipe (111) is connected with the collecting outlet in parallel, so that the pipe cavities of the straight pipes (111) are in a parallel structure; each bracket (112) is arranged corresponding to a straight pipe (111), specifically, each bracket (112) is composed of two bracket strips (1121) which are arranged face to face, a groove (11211) is formed in the opposite surface of each bracket strip (1121) corresponding to the straight pipe (111), the straight pipe (111) is accommodated in the groove (11211) of the bracket strips which are arranged face to face, namely, the bracket (112) clamps the straight pipe (111) from two sides; the connecting strips (113) are linear battens and are embedded between the adjacent brackets (112); the plurality of brackets (112) and the plurality of connecting strips (113) are spliced to form a plate-shaped body;

after integral brazing forming, two sides of the connecting strip (113) are respectively brazed and connected with the adjacent layer channel units, so that the straight pipe (111) is clamped and fixed by the bracket (112), and the whole pipe layer channel unit (11) is integrated.

2. The plate fin heat exchanger of brazed tube clamp of claim 1, wherein: before the integral brazing forming, brazing foils are arranged between the opposite surfaces of the support strips (1121) and in the grooves (11211) of the support strips, the straight pipes are made of materials capable of being brazed or the surfaces of the straight pipes are subjected to plating treatment, and after the integral brazing forming is carried out, the groove walls (11211) of the support strips are in brazing connection with the straight pipes (111) and the two support strips (1121).

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