CN211977651U - Double-pipe heat exchanger - Google Patents

Abstract

The utility model provides a casing heat exchanger, including the outer tube, arrange in the outer tube with the inner tube of outer tube coaxial center, the inner tube is installed reducing screw joint respectively at outer tube extension department both ends, and left and right-hand member reducing screw joint department is equipped with cold material inlet pipe and cold material discharging pipe respectively, and cold material inlet pipe and cold material discharging pipe pass through circulating line and cooling device intercommunication, the surface of inner tube is equipped with a plurality of spiral diaphragms along the equidistant of axial, and the spiral diaphragm is equipped with a plurality of through-holes along the equidistant spiral trend on the spiral diaphragm; the downside of outer tube is equipped with the hot material inlet pipe, and the reaction liquid case is connected to the hot material inlet pipe other end, and the hot material discharging pipe is connected to the upside of outer tube, still install temperature sensor on the outer tube. The equipment improves the heat exchange efficiency of cold materials and hot materials by accelerating the flowing speed of a cooling medium and delaying the flowing speed of the hot materials, thereby improving the service performance of the double-pipe heat exchanger and reducing coking.

Description

Double-pipe heat exchanger

Technical Field

The utility model relates to a heat exchanger technical field specifically is a double-pipe heat exchanger.

Background

The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, and is also called a heat exchanger. The shell and tube heat exchanger is the most widely used heat exchange equipment in the chemical production at present. The number, the pipe diameter and the length of the tubes and the flowing form of the shell-side fluid have important influence on the heat exchange efficiency between the two fluids. Increasing the heat transfer area is an effective heat transfer enhancement way, but the increase of the heat transfer area cannot be realized by increasing the size of the heat exchanger, and the double-pipe heat exchanger has a simple structure, the heat transfer area can be freely increased and decreased, and the double-pipe heat exchanger is gradually and widely applied.

The double-pipe heat exchanger is a concentric sleeve formed by connecting two standard pipes with different sizes, wherein a pipe with a larger diameter is called an outer pipe or a shell pass, and a pipe with a smaller diameter is called an inner pipe or a pipe pass. Two different media can flow in the shell side and the tube side in the reverse direction to achieve the effect of heat exchange, the heat transfer efficiency is high, the heat exchanger is a pure countercurrent type heat exchanger, and meanwhile, the heat transfer coefficient can be increased by selecting a proper section size to improve the heat transfer effect.

SUMMERY OF THE UTILITY MODEL

The utility model provides a sleeve pipe heat exchanger, through improving the heat convection coefficient of fluid in the ring chamber improve total heat transfer speed, with low costs, the heat scatters and disappears fewly, and temperature control precision is high.

In order to achieve the above object, the utility model provides a following technical scheme: a double-pipe heat exchanger comprises an outer pipe and an inner pipe which is arranged in the outer pipe and has the same axis with the outer pipe, wherein an annular cavity is formed between the outer pipe and the inner pipe, the inner pipe penetrates through the outer pipe, the inner pipe is hermetically connected with the end surface of the outer pipe, reducing spiral joints are respectively arranged at two ends of the extending part of the outer pipe of the inner pipe, a cold material feeding pipe is arranged at the reducing spiral joint at the left end, a cold material discharging pipe is arranged at the reducing spiral joint at the right end, the cold material feeding pipe and the cold material discharging pipe are communicated with a cooling device through a circulating pipeline, a plurality of spiral diaphragms are arranged on the outer surface of the inner pipe at equal intervals along the axial; the downside of outer tube is equipped with the hot material inlet pipe, installs the solenoid valve on the hot material inlet pipe, and the reaction liquid case is connected to the hot material inlet pipe other end, and the hot material discharging pipe is connected to the upside of outer tube, still install temperature sensor on the outer tube.

Preferably, the outer pipe and the inner pipe are both ordinary steel pipes or stainless steel pipes, the inner diameter of the inner pipe is smaller than 3mm, the thickness of the inner pipe is 2mm, and the caliber of the inner pipe is smaller than that of the cold material feeding pipe.

Preferably, the distance between the spiral diaphragms is 10mm to 30mm, the thickness is 1 mm to 3mm, the material is steel, and the maximum outer diameter of the spiral diaphragms is smaller than the inner diameter of the outer pipe.

Preferably, the spiral membrane is welded with the outer surface of the inner tube through hot melting; the hot material feeding pipe, the hot material discharging pipe and the outer pipe are respectively welded through hot melting.

Preferably, the cold material flows in the opposite direction to the hot material.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the heat exchanger adopts a sleeve form and the port is sealed, so that the scaling and coking phenomena are reduced, and the cleaning is facilitated;

(2) the spiral diaphragm and the through holes are arranged on the outer surface of the inner pipe at equal intervals, so that the flow speed of fluid in the outer pipe is further slowed down, and the heat exchange area is increased, so that the convection heat exchange coefficient of shell pass fluid is improved;

(3) the utility model discloses thereby the bore of well cold charge material inlet pipe is greater than the inner tube bore and makes the flow velocity of coolant in the inner tube increase fast for heat transfer speed, improves the heat transfer effect.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

FIG. 1 is a structural diagram of a double pipe heat exchanger of the present invention;

the device comprises an outer pipe 1, an inner pipe 2, a cold material feeding pipe 3, a reducing spiral joint 4, a cold material discharging pipe 5, a cooling device 6, a circulating pipeline 7, a hot material feeding pipe 8, a reaction liquid box 9, an electromagnetic valve 10, a hot material discharging pipe 11, a spiral diaphragm 12, a through hole 13 and a temperature sensor 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "intermediate," "at … … end," "at the other end," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Example (b): referring to fig. 1, a double-pipe heat exchanger comprises an outer pipe 1 and an inner pipe 2 arranged in the outer pipe 1 and coaxial with the outer pipe 1, wherein an annular cavity is formed between the outer pipe 1 and the inner pipe 2, the inner pipe 2 penetrates through the outer pipe 1, the inner pipe 2 is hermetically connected with the end face of the outer pipe 1, reducing spiral joints 4 are respectively arranged at two ends of the extending part of the outer pipe 1 of the inner pipe 2, a cold material feeding pipe 3 is arranged at the reducing spiral joint 4 at the left end, a cold material discharging pipe 5 is arranged at the reducing spiral joint 4 at the right end, the cold material feeding pipe 3 and the cold material discharging pipe 5 are communicated with a cooling device 6 through a circulating pipeline 7, a plurality of spiral diaphragms 12 are arranged on the outer surface of the inner pipe 2 at equal intervals along the axial direction; the downside of outer tube 1 is equipped with hot material inlet pipe 8, installs solenoid valve 10 on the hot material inlet pipe 8, reaction liquid box 9 is connected to the hot material inlet pipe 8 other end, and hot material discharging pipe 11 is connected to the upside of outer tube 1, still installs temperature sensor 14 on the outer tube 1.

In the specific embodiment, the cold materials and the hot materials can better exchange heat in opposite flowing directions, and the reducing spiral joint 4 and the electromagnetic valve 10 are made of materials with strong corrosion resistance, so that the generation of particles can be reduced, and the pipeline blockage can be avoided. Specifically, the reducing screw joint 4 is made of stainless steel material and is suitable for the solution with higher requirement on granularity.

Specifically, outer tube 1 and inner tube 2 are ordinary steel pipe or nonrust steel pipe, and the internal diameter of inner tube 2 is less than 3mm, and thickness is 2mm and the bore of inner tube 2 is less than the bore of cold material inlet pipe 3.

Further, the distance between the spiral diaphragms 12 is 10mm to 30mm, the thickness is 1 mm to 3mm, the material is steel, and the maximum outer diameter of the spiral diaphragms 12 is smaller than the inner diameter of the outer tube 1.

Furthermore, the spiral membrane 12 is welded with the outer surface of the inner tube 2 through hot melting; the hot material feeding pipe 8, the hot material discharging pipe 11 and the outer pipe 1 are respectively welded through hot melting.

In order to avoid leakage of the reaction liquid at both end face positions of the outer tube 1, the end face positions of the inner tube 2 and the outer tube 1 may be sealed by thermal welding. In other embodiments, the outer tube 1 and the inner tube 2 can also be integrally formed, the end face of the outer tube 1 is connected with the inner tube 2 in a sealing manner, subsequent welding and sealing are not needed, the process is simple, and the manufacturing cost is low.

Because of the bore of inner tube 2 is less than the bore of cold burden inlet pipe 3 and cold burden discharging pipe 5, so inner tube 2 and cold burden inlet pipe 3 and cold burden discharging pipe 5 pass through reducing screwed joint 4 intercommunication, can realize leading to liquid in the sealed environment.

In addition, after the cooling medium got into inner tube 2 in by cold material inlet pipe 3, the pipe diameter diminishes, and the fluidic pressure in inner tube 2 is big for the velocity of flow grow reduces cooling medium and outside heat exchange, thereby avoids influencing the heat transfer effect of cooling medium and reaction liquid because of the cooling medium temperature change. And reaction liquid gets into in the outer tube 1 back through hot material inlet pipe 8, the pipe diameter grow, and the fluidic pressure in outer tube 1 is little for the velocity of flow diminishes, and helical diaphragm 12 and the through-hole 13 of inner tube 2 surface have increased shell side fluidic heat transfer area simultaneously and can prolong the heat transfer time of reaction liquid in the outer tube 1 and the cooling medium in the inner tube 2, thereby improve the cooling effect to reaction liquid, read the temperature through temperature sensor 14, be favorable to the temperature control precision of bushing type heat exchanger.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. The double-pipe heat exchanger comprises an outer pipe (1), an inner pipe (2) which is arranged in the outer pipe (1) and has the same axle center with the outer pipe (1), and is characterized in that: an annular cavity is formed between the outer pipe (1) and the inner pipe (2), the inner pipe (2) penetrates through the outer pipe (1), the inner pipe (2) is connected with the end face of the outer pipe (1) in a sealing mode, reducing spiral joints (4) are respectively installed at two ends of the extending part of the outer pipe (1) of the inner pipe (2), a cold material feeding pipe (3) is arranged at the position of the reducing spiral joint (4) at the left end, a cold material discharging pipe (5) is arranged at the position of the reducing spiral joint (4) at the right end, the cold material feeding pipe (3) and the cold material discharging pipe (5) are communicated with a cooling device (6) through a circulating pipeline (7), a plurality of spiral diaphragms (12) are axially arranged on the outer surface of the inner pipe (2) at equal intervals, and a plurality of through holes (13) are arranged on the; the downside of outer tube (1) is equipped with hot material inlet pipe (8), install solenoid valve (10) on hot material inlet pipe (8), reaction liquid case (9) are connected to hot material inlet pipe (8) other end, hot material discharging pipe (11) are connected to the upside of outer tube (1), still install temperature sensor (14) on outer tube (1).

2. A double pipe heat exchanger according to claim 1, wherein: the outer pipe (1) and the inner pipe (2) are both ordinary steel pipes or stainless steel pipes, the inner diameter of the inner pipe (2) is smaller than 3mm, the thickness is 2mm, and the caliber of the inner pipe (2) is smaller than that of the cold material feeding pipe (3).

3. A double pipe heat exchanger according to claim 1, wherein: the distance between the spiral diaphragms (12) is 10-30 mm, the thickness is 1-3 mm, the materials are steel materials, and the maximum outer diameter of the spiral diaphragms (12) is smaller than the inner diameter of the outer pipe (1).

4. A double pipe heat exchanger according to claim 1, wherein: the spiral membrane (12) is welded with the outer surface of the inner tube (2) through hot melting; the hot material feeding pipe (8), the hot material discharging pipe (11) and the outer pipe (1) are respectively welded through hot melting.

5. A double pipe heat exchanger according to claim 1, wherein: the cold material flows in the opposite direction to the hot material.

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