CN209926938U

CN209926938U - Heat exchanger

Info

Publication number: CN209926938U
Application number: CN201920765216.5U
Authority: CN
Inventors: 马刚; 金仲平; 元海荣; 顾荣见; 李隆骏; 许林滔; 胡家扬; 陈灵江
Original assignee: TAIZHOU SUPERVISION AND INSPECTION CENTER OF SPECIAL EQUIPMENT
Current assignee: TAIZHOU SUPERVISION AND INSPECTION CENTER OF SPECIAL EQUIPMENT
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-01-10
Anticipated expiration: 2029-05-24

Abstract

The utility model provides a heat exchange device belongs to mechanical skill indirect heating equipment technical field. It has solved the lower problem of current heat transfer device heat exchange efficiency. This heat transfer device, including the casing, set up the heat exchange tube in the casing and set up the baffling board in the casing along casing length direction spiral along casing length direction, the one end of casing has shell side fluid import and the other end has shell side fluid export, be equipped with a plurality of fins on the lateral wall of heat exchange tube, the heat exchange tube encircles the axial lead interval distribution of casing, the fin is rectangular form, the fin has towards one side of shell side fluid import direction and is used for making shell side fluid towards keeping away from the water conservancy diversion face that the heat exchange tube direction flows, it has the baffling mouth that is close to the shell axial lead and supplies shell side fluid to pass through to open along baffling board extending direction interval on the baffling board. The utility model discloses can make shell side fluid form radial vortex, make shell side fluid and heat exchange tube contact more abundant and the rate of utilization higher, the heat transfer effect is better.

Description

Heat exchanger

Technical Field

The utility model belongs to the technical field of indirect heating equipment, a shell and tube heat transfer device is related to.

Background

The heat exchanger is an energy-saving device for transferring heat between materials between two or more than two kinds of fluids with different temperatures, so that the heat is transferred from the fluid with higher temperature to the fluid with lower temperature, the temperature of the fluid reaches the index specified by the flow to meet the requirement, and meanwhile, the heat exchanger is one of main devices for improving the energy utilization rate, and is mainly applied to the industries of petroleum, chemical engineering, heating and ventilation and the like.

The heat exchanger mainly includes three categories of dividing wall type, mixing type and heat accumulating type, wherein, the shell-and-tube heat exchanger in the dividing wall type is the most widely applied heat exchanger at present due to the advantages of simple structure, low cost, wide fluid section, easy scale cleaning, wide application range and the like. The shell-and-tube heat exchanger mainly comprises a shell and a heat exchange tube arranged in the shell, when heat exchange is carried out, one of cold fluid and hot fluid flows in the tube and is called tube-side fluid, the other fluid flows out of the tube and is called shell-side fluid, and the tube-side fluid and the shell-side fluid are prevented from being used as heat transfer surfaces to carry out heat exchange through the heat exchange tube. However, in this structure, there is a problem that the heat transfer coefficient between the shell-side fluid and the tube-side fluid is low.

In order to solve the above problems, the skilled in the art usually adopts a structure in which fins and baffles are arranged outside the heat exchange tube, for example, chinese patent application (application No. 200310105835.5) discloses a shell-and-tube heat exchanger, which comprises a shell, a central gas channel located in the center of the shell, baffles located at two ends of the shell, an inner fin tube bundle fixed between the two baffles in parallel, and a spiral baffle located between the inner fin tube bundle and the shell, so that the shell-side fluid passes through the baffle to improve the heat exchange efficiency with the heat exchange tube. Although the shell-side fluid can form a turbulent flow surrounding the shell flow channel through the baffle plate, the heat exchange efficiency is improved to a certain extent, however, the shell-side fluid only flows around the axial lead of the shell all the time, so that the part of the shell-side fluid close to the heat exchange tube is always in contact with the heat exchange tube, the temperature of the part of the shell-side fluid close to the heat exchange tube is enabled to be close to the temperature of the heat exchange tube, the heat exchange efficiency is reduced, the part of the shell-side fluid far away from the axial lead is always not in contact with the heat exchange tube, the utilization rate of the shell-side fluid of the part is lower, namely the whole heat exchange efficiency of the shell-side fluid is still not high, and when the shell-side fluid flows along the baffle plate spirally, the flow rate of the shell-. While the chinese patent application (application No. 201610793710.3) also discloses a spiral fin type heat exchanger with a similar structure, the same problem still exists in the patent.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a heat transfer device, the utility model aims to solve the technical problem that: how to improve the heat exchange efficiency of the heat exchange device.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a heat exchange device, includes the casing, sets up the heat exchange tube in the casing and sets up the baffling board in the casing along casing length direction spiral along casing length direction, the one end of casing has shell side fluid import and the other end has shell side fluid export, be equipped with a plurality of fins on the lateral wall of heat exchange tube, a serial communication port, the heat exchange tube encircles the axial lead interval distribution of casing, the fin is rectangular form, the fin has towards one side of shell side fluid import direction and is used for making shell side fluid towards keeping away from the water conservancy diversion face that the heat exchange tube direction flows, it has the baffling mouth that is close to shell axial lead and supplies shell side fluid to pass through to open along baffling board extending direction interval on the baffling.

The shell of the heat exchange device is cylindrical, the heat exchange tube is arranged in the shell along the axial direction of the shell and surrounds the axial lead of the shell, the baffle plate is also spirally arranged in the shell along the length direction of the shell, because the fins with flow guide surfaces are arranged on the outer wall of the heat exchange tube, when the shell pass fluid spirally passes through the fins along the baffle plate, the shell pass fluid after heat exchange with the fins flows along the flow guide surfaces of the fins towards the direction far away from the radiating tube, the shell pass fluid which does not exchange heat with the fins is supplemented to enter into the fins for heat exchange, and because the baffle plate is provided with the baffling openings close to the axial lead of the shell, when the shell pass fluid spirally flows along the baffle plate, part of the shell pass fluid directly flows towards the axial direction of the shell and enters the gaps of the next layer of baffling pieces through the baffling openings, the shell pass fluid forms vortex in the radial direction of the shell, moreover, the structural design also ensures that the shell pass fluid at the position close to the axial lead in the shell has larger flow, so that the fins at one side of the radiating pipe close to the axial lead of the shell can still be contacted with a large amount of shell pass fluid, thereby ensuring the integral utilization rate of the shell pass fluid, ensuring that the heat exchange of all parts of the heat exchange pipe is more uniform, and the utilization efficiency of the fins is higher, thereby improving the heat exchange efficiency of the heat exchange device.

And the flow guide surfaces of the fins face the direction of the shell-side fluid inlet, and the main flow channels of the shell-side fluid are flow channels along the spiral direction of the baffle plate, so that the shell-side fluid has a certain included angle with the flow guide surfaces of the fins when flowing to the fins, and the shell-side fluid has smaller pressure drop and smoother flow when flowing.

In the heat exchanger, the width of the baffle opening is gradually increased along the direction from the outer side of the baffle plate to the axial line of the shell. Therefore, the flow guide effect of the baffle plate can be ensured, part of shell pass fluid can flow towards the axis direction of the shell more easily, the flowing effect of the shell pass fluid along the radial direction is better, the shell pass fluid positioned on the outer side can contact with the fins more easily to perform heat exchange, and the heat exchange efficiency is improved.

In the heat exchange device, the baffle plate comprises a plurality of fan-shaped baffling sheets, the baffling sheets are sequentially connected end to end through two ends of the arc-shaped edge to form a spiral shape, and adjacent baffling sheets are oppositely and obliquely arranged to form the baffling opening between the two adjacent baffling sheets. This baffle simple structure forms through the welding of sectorial baffling piece, makes to form the baffling mouth naturally between the baffling piece, and processing is more simple and convenient.

In the heat exchanging device, an included angle between the side edges of two adjacent baffle plates is 10-40 degrees.

In the above heat exchanger, a projection of the baffle plate along the longitudinal direction of the housing is in a fan shape with a central angle of 90 °. Thus, four baffle plates can form a complete spiral period. And the baffling sheets on the upper layer and the lower layer are all positioned on the same axis, so that the heat exchange tube is convenient to install.

In foretell heat transfer device, still be equipped with a plurality of bracing pieces that set up along heat exchange tube length direction on the baffling board, it has the mounting hole and steps down the hole to open on the baffling piece, the bracing piece passes the mounting hole and links firmly with the baffling piece, the aperture in the hole of stepping down is greater than the external diameter of heat exchange tube and supplies the heat exchange tube to pass. Set up many bracing pieces on the baffling board and support the baffling piece, make the structure of baffling board more firm, and the aperture of the hole of stepping down is great, and the heat exchange tube that is convenient for be provided with the fin passes the baffling piece, avoids the fin to form the installation of heat exchange tube and interferes.

In the heat exchange device, the flow guide surface of the fin is shaped like an inward concave arc, one end of the flow guide surface is in smooth transition with the outer wall of the heat exchange tube, and the other end of the flow guide surface extends towards the direction far away from the heat exchange tube. The guide surface is arc-shaped, so that the flow direction of the shell-side fluid can be changed more smoothly, the shell-side fluid flows in the direction far away from the heat exchange tube, the surface area of the fin can be increased by the guide surface being arc-shaped, and the heat exchange effect is improved.

In the heat exchange device, the thickness of the fin is reduced from one end close to the heat exchange tube to the other end far away from the heat exchange tube. The fin is thicker with the one end thickness that the heat exchange tube is connected, be convenient for the heat transfer between fin and the heat exchange tube, and the fin keeps away from the one end thickness of heat exchange tube thinner, the fin that has increased unit volume and shell side fluidic area of contact, thereby the heat exchange efficiency of heat exchange tube has been improved, moreover, such design makes the area of fin lateral part littleer, the resistance when the spiral direction of shell side fluid edge baffling board passes through the fin is littleer, make the fluidic pressure drop of shell side also littleer, avoid excessively reducing the fluidic velocity of flow of shell side, thereby guarantee heat exchange efficiency.

In the above heat exchanger, a back flow surface is provided on a side of the fin opposite to the flow guide surface, and the back flow surface is also arc-shaped and has the same bending direction as the flow guide surface. The design also increases the area of the back of the fin, and improves the heat exchange effect of the fin.

In the above heat exchange device, the fins are spirally distributed along the outer wall of the heat exchange tube.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model discloses a set up the fin that has the water conservancy diversion face and set up the baffling mouth on the baffling piece that the spiral set up at the heat exchange tube outer wall, make shell side fluid still can produce the vortex along the radial flow of casing when following baffling piece spiral flow, the shell side fluid homoenergetic that makes inboard and outside can carry out the heat exchange with the heat exchange tube, and each ascending fin homoenergetic that week of heat exchange tube all can fully contact with shell side fluid, heat transfer device's the higher and fluidic bulk temperature of tube side is also more even, the heat transfer effect is better.

2. This baffling board links firmly through a plurality of sectorial baffling pieces and forms, and the baffling mouth sets up and forms for adjacent baffling piece looks slope, makes the width of baffling mouth increase in proper order to inboard direction along the outside, makes shell side fluid change to flow to the axle center direction of casing, the formation of the radial vortex of being convenient for, and this baffling board simple structure is convenient for process moreover, low in production cost.

3. The flow guide surface of the fin faces the direction of the shell-side fluid inlet, and the bottom of the fin is thick and the top of the fin is thin, so that the fin can guide the shell-side fluid, the heat exchange efficiency between the heat exchange tube and the shell-side fluid is improved, the pressure drop of the shell-side fluid is small, and the flow rate of the shell-side fluid is ensured.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic diagram of a heat pipe;

FIG. 3 is a schematic view of the baffle arrangement.

In the figure, 1, a housing; 11. a shell-side fluid inlet; 12. a shell-side fluid outlet; 2. a heat exchange pipe; 3. a fin; 31. a flow guide surface; 32. a back flow surface; 4. a baffle plate; 41. a baffle sheet; 411. a hole of abdication; 412. mounting holes; 42. a baffling port; 5. a support rod.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

A heat exchange device is shown in figures 1 and 2 and comprises a shell 1, a baffle plate 4 and a plurality of heat exchange tubes 2, wherein the shell 1 is cylindrical, one end of the shell 1 is provided with a shell-side fluid inlet 11, the other end of the shell 1 is provided with a shell-side fluid outlet 12, the baffle plate 4 is spirally arranged in the shell 1 along the length direction of the shell 1, the heat exchange tubes 2 are also arranged in the shell 1 along the length direction of the shell 1, fins 3 are circumferentially arranged on the outer peripheral surface of each heat exchange tube 2, each fin 3 is provided with a flow guide surface 31 which enables shell-side fluid to be far away from a radiating tube and forms disturbance, and a plurality of baffle openings 42 for the shell-side fluid to pass through are arranged on the baffle plate 4 at intervals along the extending direction of the baffle plate, so that the shell-side fluid forms disturbance when flowing to the outlet of the shell-side fluid along the shell-side fluid inlet 11, and.

Specifically, as shown in fig. 2, the baffle plate 4 includes a plurality of baffling pieces 41 that connect gradually, baffling pieces 41 all are fan-shaped, the both ends on baffling piece 41 arc limit link firmly through the welding with adjacent baffling piece 41 in proper order and form the heliciform, and adjacent baffling piece 41 sets up that inclines mutually, make and form baffling mouth 42 between the side of adjacent baffling piece 41, the width of baffling mouth 42 increases to the axial lead direction of baffle plate 4 along the outside of baffle plate 4 in proper order, the contained angle between the side of adjacent baffling piece 41 is 10 ~ 40, in this embodiment, this contained angle is 30. The heat exchange tube 2 surrounds the axial lead interval distribution of casing 1 and wears to locate on baffling board 4, all set firmly a plurality of fins 3 on the lateral wall of heat exchange tube 2, fin 3 is along the circumference and the length direction interval distribution of cooling tube, fin 3 is rectangular slice, fin 3's one end links firmly with the cooling tube and the other end outwards stretches out, the both sides face of fin 3 width broad is water conservancy diversion face 31 and back flow face 32, wherein, water conservancy diversion face 31 is towards shell side fluid inlet 11 and back flow face 32 towards shell side fluid outlet 12, water conservancy diversion face 31 of fin 3 is inside sunken arc, the one end of water conservancy diversion face 31 extends towards the direction of keeping away from heat exchange tube 2 with the outer wall smooth transition of heat exchange tube 2 and the other end of water conservancy diversion face 31.

When the heat exchange device works, tube side fluid needing heat exchange is introduced into the heat exchange tube 2, shell side fluid outside the heat exchange tube 2 is introduced into the shell 1, the tube side fluid is contacted with the heat exchange tube 2 to transfer heat to the heat exchange tube 2, when the tube side fluid flows from the shell side fluid inlet 11 to the shell side fluid outlet 12, most of the shell side fluid spirally flows along the baffle plate 4, in the flowing process, part of the shell side fluid is contacted with the fin 3 on the outer wall of the heat exchange tube 2, so that the shell side fluid exchanges heat with the fin 3 along the direction of the flow guide surface 31 and flows in the direction far away from the heat exchange tube 2, and because the baffle plate 4 is provided with the baffle opening 42, part of the shell side fluid flowing along the flow channel of the baffle plate 4 directly flows towards the baffle opening 42 and directly enters the gap between the next layer of baffle plates 4, namely the shell side fluid flows towards the axial center direction of the shell 1 along the radial direction of the shell, and then supplement is formed to the shell side fluid near the radiating pipe fins 3, so that the shell side fluid forms a vortex in the radial direction of the shell 1, the shell side fluid which is positioned outside the heat exchange pipe 2 and does not exchange heat with the heat exchange pipe 2 flows to one side of the axis of the shell 1, and then contacts with the heat exchange pipe 2 for heat exchange, and the vortex in the radial direction enables the shell side fluid on one side of the axial lead of the shell 1 to have a larger flow, so that the heat exchange pipe 2 positioned on one side close to the axial lead of the shell 1 can also fully contact with the shell side fluid, the heat exchange effect of each part in the circumferential direction of the heat exchange pipe 2 is basically the same, the temperature of each part of the shell side fluid in the heat exchange pipe 2 is closer, and the heat exchange effect and the.

Further, as shown in fig. 3, in this embodiment, a plurality of support rods 5 are further disposed on the baffle plate 4, and the support rods 5 are disposed along the length direction of the casing 1 and around the axial line of the casing 1 at intervals. The baffle plate 41 is in a sector shape with a central angle of 90 degrees along the projection of the length direction of the shell 1, so that four baffle plates 41 form a spiral period of the baffle plate 41, the baffle plate 41 is provided with two yielding holes 411 and a mounting hole 412, wherein the yielding holes 411 are positioned at the outer side of the mounting hole 412, the aperture of the yielding holes 411 is larger than the outer diameter of the heat exchange tube 2, the heat exchange tube 2 provided with fins 3 can freely pass through the yielding holes 411, the interference generated during the installation of the heat exchange tube 2 is avoided, the support rod 5 passes through the yielding holes 411 and is fixedly connected with the baffle plate 41 through welding, the baffle plates 41 in each spiral period are all fixed on the support rod 5 to form a whole, the structural stability of the baffle plate 4 is improved, and the baffle plate 4 is convenient to be installed in the shell 1. Of course, in the actual use process, the baffle plates 41 in each spiral period can also adopt a design of 3 or 5, and the number of the abdicating holes 411 and the mounting holes 412 can also be selected according to the actual needs.

Further, as shown in fig. 2, in the present embodiment, the thickness of the fin 3 decreases from the end close to the heat exchange tube 2 to the end away from the heat exchange tube 2, that is, the bottom of the fin 3 is thicker and the top of the fin is thinner, the back flow surface 32 of the fin 3 is also arc-shaped, and the bending direction of the back flow surface 32 is the same as the flow guiding surface 31, so that the area of the side portion of the fin 3 is smaller and the area of the back flow surface 32 of the fin 3 is larger. By adopting the structure, the heat conduction efficiency between the fin 3 and the heat exchange tube 2 is ensured, the contact area and the heat exchange efficiency between the fin 3 and the shell pass fluid are improved, the area of the side part of the fin 3 is smaller, the resistance to the shell pass fluid is smaller, the energy loss of the shell pass fluid is smaller, and therefore the pressure drop of the shell pass fluid is reduced and the flow speed is ensured.

Further, in the present embodiment, the fins 3 are uniformly arranged along the circumference of the heat exchange tube 2 at intervals, and are distributed along the axis of the heat exchange tube 2 at intervals in the axial direction of the heat exchange tube 2. Of course, the fins 3 may also be arranged at intervals along the outer side wall of the heat exchange tube 2, or may also be arranged at intervals along the circumferential direction of the heat exchange tube 2, and at the same time, the fins 3 are arranged in a staggered manner along the length direction of the heat exchange tube 2, so that the projection of each layer of fins 3 in the length direction of the heat exchange tube 2 is located between two adjacent fins 3 of an adjacent layer, and part of the shell-side fluid can pass through the gaps between the fins 3 to contact with the fins 3 of the next layer for heat exchange, thereby further improving the utilization rate of the fins 3.

Furthermore, in this embodiment, the two ends of the casing 1 are both provided with a hollow-out mounting plate, the mounting plates are not shown in the drawings, and the two ends of the heat exchange tube 2 are respectively penetrated through the mounting plates and fixedly connected with the mounting plates, so that the heat exchange tube 2 is fixed in the casing 1.

Further, an inner fin can be arranged in the heat exchange tube 2, and the inner fin is in the prior art so as to increase the heat exchange efficiency between tube side fluid and the heat exchange tube 2.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms shell 1, shell-side fluid inlet 11, shell-side fluid outlet 12, heat exchange tubes 2, fins 3, flow guide surfaces 31, back flow surfaces 32, baffles 4, baffles 41, baffle openings 42, support rods 5, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. A heat exchange device comprises a shell (1), a heat exchange tube (2) arranged in the shell (1) along the length direction of the shell (1) and a baffle plate (4) spirally arranged in the shell (1) along the length direction of the shell (1), one end of the shell (1) is provided with a shell-side fluid inlet (11) and the other end is provided with a shell-side fluid outlet (12), the outer side wall of the heat exchange tube (2) is provided with a plurality of fins (3), it is characterized in that the heat exchange tubes (2) are distributed at intervals around the axial lead of the shell (1), the fins (3) are long, one side of the fins (3) facing the direction of the shell-side fluid inlet (11) is provided with a flow guide surface (31) for enabling the shell-side fluid to flow in the direction away from the heat exchange tube (2), and baffle openings (42) which are close to the axial lead of the shell (1) and are used for shell-side fluid to pass through are arranged on the baffle plate (4) at intervals along the extension direction of the baffle plate (4).

2. The heat exchange device according to claim 1, wherein the width of the baffle openings (42) increases in sequence from the outer side of the baffle plate (4) to the axial line of the shell (1).

3. The heat exchange device according to claim 2, wherein the baffle plate (4) comprises a plurality of fan-shaped baffle plates (41), the baffle plates (41) are sequentially connected end to end through two ends of an arc-shaped edge to form a spiral shape, and adjacent baffle plates (41) are relatively obliquely arranged to form the baffle openings (42) between the two adjacent baffle plates (41).

4. The heat exchange device according to claim 3, wherein the included angle between the side edges of two adjacent baffle plates (41) is 10-40 °.

5. A heat exchange device according to claim 3 or 4, characterized in that the baffle (41) has a sector with a central angle of 90 ° in a projection along the length direction of the shell (1).

6. The heat exchange device according to claim 5, wherein a plurality of support rods (5) are further arranged on the baffle plate (4) along the length direction of the shell (1), the baffle plate (41) is provided with mounting holes (412) and abdicating holes (411), the support rods (5) penetrate through the mounting holes (412) and are fixedly connected with the baffle plate (41), and the diameters of the abdicating holes (411) are larger than the outer diameter of the heat exchange tube (2) and are used for the heat exchange tube (2) to penetrate through.

7. A heat exchange device according to claim 3, wherein the flow guide surface (31) of the fin (3) is shaped as an inwardly concave arc, one end of the flow guide surface (31) is in smooth transition with the outer wall of the heat exchange tube (2), and the other end of the flow guide surface (31) extends in a direction away from the heat exchange tube (2).

8. A heat exchange device according to claim 7, wherein the thickness of the fin (3) decreases from the end close to the heat exchange tube (2) to the end far from the heat exchange tube (2).

9. The heat exchange device according to claim 8, wherein the fin (3) has a back flow surface (32) on the side opposite to the flow guide surface (31), and the back flow surface (32) is also arc-shaped and has the same bending direction as the flow guide surface (31).

10. A heat exchange device according to claim 7 or 8 or 9, wherein the fins (3) are spirally distributed along the outer wall of the heat exchange tube (2).