CN107192284A - A kind of close-coupled heat-exchanger rig - Google Patents

Abstract

A compact heat exchange device is composed of a hot fluid outlet channel, a cold fluid inlet channel, a heat exchange plate group, a cold fluid outlet channel, a hot fluid inlet channel, a heat exchanger shell and a partition. The heat exchange unit in the heat exchange plate group is integrally formed by the upper outer heat exchange plate, upper inner heat exchange plate, lower inner heat exchange plate and lower outer heat exchange plate by diffusion welding, and the formed heat exchange unit is composed of cold fluid channel , thermal fluid channel and heat-conducting metal substrate. The cold fluid channel in the heat exchange unit surrounds or semi-encloses the hot fluid channel, reducing the heat transfer area for the hot fluid to transfer heat to the outside through the metal plate, and can realize heat exchange under the condition of a relatively large heat dissipation area higher heat transfer efficiency.

Description

A compact heat exchange device

technical field

The invention belongs to the field of heat transfer and relates to a compact heat exchange device.

Background technique

Heat exchangers are widely used and of various types, and play an important role in many industries. With the development of science and technology, some emerging fields or applications require heat exchangers to have higher heat transfer efficiency, smaller volume or weight, and long-term stable operation under high temperature and high pressure conditions. Traditional shell-and-tube heat exchangers have low heat transfer efficiency and bulky volume, which limits their application range. Plate heat exchangers have high heat exchange efficiency, compact structure, light weight, strong adaptability, more and more forms, and more and more applications. However, due to defects in the manufacturing process, the traditional plate heat exchanger is prone to failure due to deformation, corrosion, blockage and other reasons under high temperature and high pressure conditions.

The printed circuit board heat exchanger proposed by British Heatric Company is a plate heat exchanger that can withstand high fluid temperature and pressure. The printed circuit board heat exchanger consists of multiple heat exchange plates, each heat exchange plate has a number of fluid channels carved by chemical etching. A plurality of heat exchange plates are superimposed and integrally formed by diffusion welding, and two adjacent heat exchange plates penetrate each other by 1mm to 2mm. Since the integrated heat exchanger has the same material, the thermal expansion coefficient of each part of the heat exchanger changes with temperature in the same way, so it can withstand higher temperature and pressure.

In a printed circuit board heat exchanger, generally only one kind of hot fluid or cold fluid passes through all channels of each heat exchange plate, and hot fluid and cold fluid flow in the channels of two adjacent heat exchange plates respectively. In the heat exchange process, the heat of the hot fluid is first transferred to the metal plate, and then the heat is transferred to the cold fluid after the temperature of the metal plate rises. At the same time, the metal plate also dissipates heat to the surrounding boundaries. When the number of layers of the heat exchange plate is large, the heat dissipated from the metal plate to the outside is relatively small compared with the total heat transfer, and the heat dissipation has little effect on the heat transfer efficiency. However, when the number of heat exchange plate layers is small, the heat dissipated from the metal plate to the outside cannot be ignored compared with the total heat transfer. At this time, the heat dissipation will significantly reduce the heat transfer efficiency of the heat exchanger.

Contents of the invention

The object of the present invention is to propose a compact heat exchange device, the cold fluid channel of the heat exchange device is arranged on the periphery of the hot fluid channel, so as to realize the enveloping trend of the cold fluid to the hot fluid and reduce the flow of the hot fluid through the metal plate. The heat transfer area that transfers heat to the outside world achieves a higher heat transfer efficiency of the printed circuit board heat exchanger under the condition of a relatively large heat dissipation area.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A compact heat exchange device, comprising a heat exchanger shell and a hot fluid outlet channel, a hot fluid inlet channel, a cold fluid inlet channel, a cold fluid outlet channel and a heat exchange plate set arranged in the heat exchanger shell;

The heat exchange plate set includes several heat exchange units, each heat exchange unit includes a cold fluid channel, a hot fluid channel arranged in the cold fluid channel, a heat conducting metal substrate is arranged between the cold fluid channel and the hot fluid channel, One end of the heat exchange plate group is provided with a cold fluid inlet channel connected with the cold fluid channel and a hot fluid outlet channel connected with the hot fluid channel, and the other end of the heat exchange plate group is provided with a cold fluid channel connected with the cold fluid channel. A fluid outlet channel and a thermal fluid inlet channel communicate with the thermal fluid channel.

A further improvement of the present invention lies in that partition plates are arranged on both sides of the heat exchange plate group.

A further improvement of the present invention is that the cold fluid channel and the hot fluid channel are arranged parallel to each other.

A further improvement of the present invention is that the cold fluid channel is a straight channel, a zigzag channel or an S-shaped channel.

A further improvement of the present invention is that the heat exchange unit also includes an upper inner heat exchange plate, a lower inner heat exchange plate, an upper outer heat exchange plate and a lower outer heat exchange plate; the shape of the upper inner heat exchange plate and the lower inner heat exchange plate The same and symmetrical arrangement, the upper outer heat exchange plate and the lower outer heat exchange plate have the same shape and are symmetrically arranged; the heat exchange unit is made by the following method: holes of the same size are opened on the upper outer heat exchange plate and the lower outer heat exchange plate, The upper inner heat exchange plate and the lower inner heat exchange plate are arranged in the hole, the cavity formed between the upper inner heat exchange plate and the lower inner heat exchange plate is a thermal fluid channel, and the upper inner heat exchange plate and the upper outer heat exchange plate The cavity formed between the lower inner heat exchange plate and the lower outer heat exchange plate is a cold fluid channel.

A further improvement of the present invention is that one end of several cold fluid channels is connected to the cold fluid flow space, and an inlet or outlet header is arranged on one side of the cold fluid flow space.

A further improvement of the present invention is that each heat exchange unit is integrally formed by diffusion welding by stacking an upper outer heat exchange plate, a lower outer heat exchange plate, an upper inner heat exchange plate and a lower inner heat exchange plate.

A further improvement of the present invention is that the lengths of the upper inner heat exchange plate and the lower inner heat exchange plate in the fluid flow direction are greater than the lengths of the upper outer heat exchange plate and the lower outer heat exchange plate.

A further improvement of the present invention is that the shapes of the upper outer heat exchange plate, the lower outer heat exchange plate, the upper inner heat exchange plate and the lower inner heat exchange plate are made by pressing or pouring.

Compared with the prior art, the present invention has the following beneficial effects: in the present invention, the hot fluid channel is arranged in the cold fluid channel, by arranging the cold fluid channel on the periphery of the hot fluid channel, and the cold fluid channel and the hot fluid channel A heat-conducting metal substrate is set between the fluid channels to realize the enveloping trend of the cold fluid to the hot fluid, reduce the heat transfer area for the hot fluid to transfer heat to the outside through the metal plate, thereby reducing the heat dissipation of the hot fluid to the outside through the metal plate, The higher heat transfer efficiency of the heat exchange device is achieved under the condition that the number of heat exchanger layers is small or the heat dissipation area is relatively large, which overcomes the heat transfer problem of the heat exchanger when the number of heat exchange plates in the prior art is small. The problem of low efficiency. Since it is easy to change the cross-sectional area of the cold fluid or the hot fluid passage in the present invention, the present invention can adapt to the situation where the flow rate of the cold side and the hot fluid differ greatly.

Further, the two sides of the heat exchange plate group are provided with partitions for arranging hot fluid inlets, which facilitates the arrangement of hot fluid inlets and cold fluid inlets.

Further, since the hot and cold fluids flow in parallel, in order to organize the inflow and outflow of the hot and cold fluids, the length of the upper inner heat exchange plate and the lower inner heat exchange plate in the direction of fluid flow is greater than that of the upper outer heat exchange plate and the lower outer heat exchange plate. plate to allow room for cold fluid to flow.

Further, on one side of the cold fluid flow space, an inlet or outlet header is arranged to facilitate distribution of inflow or collection of outflow fluid.

Description of drawings

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

Fig. 2 is a schematic cross-sectional structure diagram of the heat exchange plate group.

Fig. 3 is a structural diagram of the heat exchange plate group.

Figure 4 is a schematic diagram of the flow of cold and hot fluids in the heat exchanger.

Among them, 1 is the hot fluid outlet channel, 2 is the hot fluid channel, 3 is the partition, 4 is the cold fluid inlet channel, 5 is the shell, 6 is the cold fluid outlet channel, 7 is the cold fluid flow space, and 8 is the cold fluid flow space. Fluid channel, 9 is the hot fluid inlet channel, 10 is the heat exchange plate group, 11 is the upper outer heat exchange plate, 12 is the upper inner heat exchange plate, 13 is the lower inner heat exchange plate, 14 is the lower outer heat exchange plate.

detailed description

The invention will be described in further detail below in conjunction with the accompanying drawings.

1 and 4, the compact heat exchange device of the present invention includes a heat exchanger shell 5 and a hot fluid outlet channel 1, a hot fluid inlet channel 9, and a cold fluid inlet channel arranged in the heat exchanger shell 5. Channel 4, cold fluid outlet channel 6 and heat exchange plate group 10; the outside of heat exchange plate group 10 is provided with a partition plate 3 for arranging hot fluid inlet; see Fig. 2 and Fig. 3, heat exchange plate group 10 includes several heat exchange plates Each heat exchange unit includes a cold fluid channel 8, a hot fluid channel 2, a heat-conducting metal substrate, an upper inner heat exchange plate 12, a lower inner heat exchange plate 13, an upper outer heat exchange plate 11, and a lower outer heat exchange plate 14. The upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 have the same shape and are arranged symmetrically, and the upper outer heat exchange plate 11 and the lower outer heat exchange plate 14 have the same shape and are arranged symmetrically; one end of the heat exchange plate group 10 is provided with a The cold fluid inlet channel 4 communicated with the fluid channel 8 and the hot fluid outlet channel 1 communicated with the hot fluid channel 2, and the other end of the heat exchange plate group 10 is provided with a cold fluid outlet channel communicated with the cold fluid channel 8 6 and the thermal fluid inlet channel 9 communicating with the thermal fluid channel 2.

The heat exchange unit is made by the following method: open holes of the same size on the upper outer heat exchange plate 11 and the lower outer heat exchange plate 14, set the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 in the holes, and set the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13. The cavity formed between the heat exchange plate 12 and the lower inner heat exchange plate 13 is the thermal fluid channel 2, between the upper inner heat exchange plate 12 and the upper outer heat exchange plate 11, and between the lower inner heat exchange plate 13 and the lower outer heat exchange plate. The cavities formed between the hot plates 14 are cold fluid channels 8 .

Referring to Fig. 3, when semicircular holes are opened on the upper outer heat exchange plate 11 and the lower outer heat exchange plate 14, since the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 need to be fixed, the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 need to be fixed. Parts of the plate 12 and the lower inner heat exchange plate 13 protrude from the cold fluid channel 8 to be fixed, so that the cross section of each cold fluid channel 8 is two semicircular shapes instead of one circular shape. The material of the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 is a heat conducting metal substrate. The cold fluid channel 8 and the hot fluid channel 2 are formed by etching the upper outer heat exchange plate 11 , the lower outer heat exchange plate 14 , the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 .

The cold fluid channel 8 and the hot fluid channel 2 are arranged parallel to each other, and the cold fluid channel 8 is a straight channel, a zigzag channel or an S-shaped channel. The cold fluid channel 8 surrounds or semi-encloses the hot fluid channel 2 .

Two ends of some cold fluid channels 8 in the present invention are all provided with a cold fluid flow space 7; On one side, an inlet header is arranged for distributing the inflowing fluid; the outlet ends of several cold fluid channels 8 are all communicated with the cold fluid flow space 7, and on one side of the cold fluid flow space 7, an outlet header is arranged. A tank to collect the effluent fluid.

Referring to FIG. 4 , in the present invention, the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 are longer in the direction of fluid flow than the upper outer heat exchange plate 11 and the lower outer heat exchange plate 14 . The shapes of the upper outer heat exchange plate 11 , the lower outer heat exchange plate 14 , the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 are made by pressing or pouring.

Each heat exchange unit is integrally formed by diffusion welding by stacking an upper outer heat exchange plate 11 , a lower outer heat exchange plate 14 , an upper inner heat exchange plate 12 and a lower inner heat exchange plate 13 .

Referring to Fig. 1 and Fig. 4, the concrete work process of the present invention is as follows:

The cold fluid enters the heat exchanger from the cold fluid inlet passage 4, enters the cold fluid channel 8 of each layer through the distribution pipe, and flows out from the cold fluid outlet passage 6 after the heat exchange is completed. The hot fluid enters the heat exchanger from the hot fluid inlet passage 9, then flows through the hot fluid channel, and flows out through the hot fluid outlet passage 1 after the heat exchange is completed. The cold fluid and the hot fluid are always separated by the upper inner heat exchange plate, the lower inner heat exchange plate and the separator 3 .

Since the hot and cold fluids flow in parallel, in order to organize the inflow and outflow of the hot and cold fluids, the length of the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 in the direction of fluid flow is greater than that of the upper outer heat exchange plate 11 and the lower outer heat exchange plate. Plate 14, in order to leave space 7 for cold fluid flow. On one side of the cold fluid flow space 7, an inlet or outlet header is arranged for distributing the inflow or collecting the outflow. Preferably, the thermal fluid channel is formed by fusion of the upper inner heat exchange plate 12 and the lower inner heat exchange plate 13 through diffusion welding, the thermal fluid channel 2 is connected with the inlet and outlet headers, and the inlet and outlet headers are connected to the inlet and outlet of the thermal fluid respectively. The channels are connected.

Claims (9)

1. a kind of close-coupled heat-exchanger rig, it is characterised in that including heat exchanger shell (5) and be arranged in heat exchanger shell (5) Hot fluid outlet ports passage (1), thermal fluid inlet passage (9), cold fluid inlet passage (4), cold fluid outlet passage (6) and change Hot plate group (10)；

Plate package (10) includes some heat exchange units, and each heat exchange unit includes cold fluid conduit (8), is arranged on cold fluid groove Hot fluid conduit (2) in road (8), is provided with heat-conducting metal substrate between cold fluid conduit (8) and hot fluid conduit (2), changes Hot plate group (10) one end be provided with the cold fluid inlet passage (4) that is connected with cold fluid conduit (8) and with hot fluid conduit (2) the hot fluid outlet ports passage (1) being connected, plate package (10) other end is provided with what is be connected with cold fluid conduit (8) Cold fluid outlet passage (6) and the thermal fluid inlet passage (9) being connected with hot fluid conduit (2).

2. a kind of close-coupled heat-exchanger rig according to claim 1, it is characterised in that the both sides of the plate package (10) It is provided with dividing plate (3).

3. a kind of close-coupled heat-exchanger rig according to claim 1, it is characterised in that the cold fluid conduit (8) and heat Fluid channels (2) are arranged in parallel.

4. a kind of close-coupled heat-exchanger rig according to claim 1 or 3, it is characterised in that the cold fluid conduit (8) is Straight channel, zigzag passage or S-shaped passage.

5. a kind of close-coupled heat-exchanger rig according to claim 1, it is characterised in that the heat exchange unit also includes in upper Heat exchanger plates (12), lower interior heat exchanger plates (13), upper outer heat exchanger plates (11) and lower outer heat exchanger plates (14)；Go up interior heat exchanger plates (12) and lower interior Heat exchanger plates (13) shape is identical and is symmetrical arranged, and upper outer heat exchanger plates (11) are identical with lower outer heat exchanger plates (14) shape and symmetrically set Put；Heat exchange unit is made by the following method：Formed objects are opened up on upper outer heat exchanger plates (11) and lower outer heat exchanger plates (14) Hole, set in hole in heat exchanger plates (12) and lower interior heat exchanger plates (13), upper interior heat exchanger plates (12) and lower interior heat exchanger plates (13) it Between the cavity that is formed be hot fluid conduit (2), between upper interior heat exchanger plates (12) and upper outer heat exchanger plates (11), lower interior heat exchanger plates (13) The cavity formed between lower outer heat exchanger plates (14) is cold fluid conduit (8).

6. a kind of close-coupled heat-exchanger rig according to claim 5, it is characterised in that the one of some cold fluid conduits (8) End is connected with the cold fluid flowing space (7), and in the side of the cold fluid flowing space (7), one entrance of arrangement or outlet Header.

7. a kind of close-coupled heat-exchanger rig according to claim 5, it is characterised in that each heat exchange unit is by upper outer heat exchange Plate (11), lower outer heat exchanger plates (14), upper interior heat exchanger plates (12) and lower interior heat exchanger plates (13) stack up by the way of diffusion welding (DW) Integrated molding.

8. a kind of close-coupled heat-exchanger rig according to claim 5, it is characterised in that the upper interior heat exchanger plates (12) and under Interior heat exchanger plates (13) are greater than outer heat exchanger plates (11) and lower outer heat exchanger plates (14) length in the length of fluid flow direction.

9. a kind of close-coupled heat-exchanger rig according to claim 8, it is characterised in that the upper outer heat exchanger plates (11), under Outer heat exchanger plates (14), upper interior heat exchanger plates (12) and lower interior heat exchanger plates (13) shape are made by the mode suppressed or poured.