JPS5923970Y2 - Triple tube heat exchange unit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a triple-pipe heat exchange unit that can efficiently exchange heat between fluids and has excellent heat transfer performance.

Double-tube heat exchangers or multi-tube heat exchangers are used to exchange heat with small volumes of fluid, and double-tube heat exchangers have appropriate pipe diameters as shown in Figure 1. It is a combination of an outer tube and an inner tube, and in addition to a smooth circular tube, the inner tube is a spiral tube, a finned tube, or a tube with twisted pieces inserted to improve heat transfer performance. If the amount of expansion or contraction is large due to the temperature difference between the outer tube and the inner tube, a method of installing an expansion joint on the outer tube, a gland packing method, or a return bend of a double tube is used. A method of absorbing expansion and contraction due to temperature differences is used, but such a double-tube heat exchanger not only has a long length and requires a large installation area to exchange heat of a small volume of fluid. It had drawbacks such as insufficient heat exchange ability.

In addition, although multitubular heat exchangers require a small installation area, they are complicated to assemble, and it is difficult to secure the fluid flow rate to improve heat transfer performance, and there are some design and manufacturing difficulties.
There were various drawbacks, such as the structure being easily strained and the heat exchange efficiency decreasing.

The present invention solves this drawback, and the flow path through which the fluid passes is cut out from the triple pipe formed in the outer flow path, the intermediate flow path, and the center flow path, and the intermediate flow path is formed on the outside. Surrounded by the flow path and the center flow path, both the outer and inner peripheral surfaces of the intermediate flow path are heat transfer surfaces, and the heat transfer area is increased by exchanging heat from the inner and outer tube walls of the intermediate flow path. In addition, the structure is such that the outer, middle, and inner tubes of the triple tube are assembled and engaged in a single partition, making it possible to secure the triple tube. To provide a triple-pipe heat exchange unit that is easy to form, has a compact structure, and can efficiently exchange heat between fluids and has excellent heat transfer performance.

More specifically, the present invention forms a triple tube with an outer tube having a predetermined diameter, a middle tube and an inner tube which are both smooth round tubes at both ends and spiral tubes at both ends. There are three flow paths: an outer flow path between the middle and inner tubes, an intermediate flow path between the middle and inner tubes, and a center flow path within the inner tube. each of which is engaged with a single outflow compartment, the compartment having a compartment outer passage communicating with the outer passage, a compartment center passage communicating with the central passage, and a partition communicating with the intermediate passage. The present invention relates to a triple-tube heat exchange unit characterized in that intermediate passages are separated from each other.

Hereinafter, the triple tube heat exchange unit according to the present invention will be described in detail with reference to the drawings.

Fig. 2 is a partially cross-sectional side view of one embodiment of the triple-tube heat exchange unit according to the present invention, and Figs. 3, 4, and 5 are the triple-tube heat exchange unit according to the present invention. Side sectional views showing other embodiments of the partitions in which the triple tubes of the unit are engaged, FIG. 6 is a state in which the triple tubes of the triple tube heat exchange unit according to the present invention are engaged in the tube expansion method. FIG. 7 is a side sectional view showing an embodiment of the triple tube type heat exchange unit according to the present invention in which the triple tubes are engaged by an O-ring method.

In the drawing, 1, 2, and 3 are an outer tube, a middle tube, and an inner tube having predetermined tube diameters forming a triple tube, and the outer tube 1 is a smooth circular tube, and the middle tube 2 and the inner tube 3 are It consists of a circular tube with both ends smooth and a spiral tube between the two ends, and these outer tube 1, middle tube 2 and inner tube 3 may be assembled concentrically, but they are not assembled concentrically. The assembled triple-pipe tube has an outer flow path a between the outer tube 1 and the inner tube 2, through which a fluid more aggressive than gas or liquid or a mixture thereof passes through, which is partitioned by the tube wall of the container tube. Three channels are provided: an intermediate channel between the tube 2 and the inner tube 3, and a central channel C within the inner tube 3.

Further, the middle tube 2 and the inner tube 3, each of which has a spiral tube between its ends, may be assembled so that the twist directions of the spirals are the same or opposite to each other.

4 and 5 are individual partitions in which both ends of the outer tube 1, middle tube 2, and inner tube 3 are engaged, and 6 is a partition chamber provided in the partition chamber 4 and communicating with the outer flow path a. an outer passage; 7 is a partition center passage provided in the partition 4 and communicating with the central passage C; 7' is a partition intermediate passage provided in the partition 4 and communicating with the intermediate passage C; Reference numeral 8 denotes a fluid A inlet/outlet provided at the end of the partition chamber 4 through which fluid A flows in or out. They are either connected as shown in Figure 2 or separated as shown in Figure 4.

Reference numeral 9 denotes a fluid B inlet/outlet provided on the side of the partition 4 through which fluid B flows in or out, and this fluid B inlet/outlet 9 communicates with the partition intermediate passage 7'.

10 is a fluid A inlet/outlet provided at the end of the partition 5 and communicates with the partition center passage 7 in the partition 5, through which fluid A flows in or out; 11 is provided at the side of the partition 5 and communicates with the partition center passage 7 inside the partition The fluid B communicates with the intermediate flow path 7' of the partition chamber, and the fluid B flows into or out of the partition chamber.
It is an entrance/exit.

When the partition chamber 4 and the partition chamber 5 have the same structure as shown in FIG. The flow branches into an outer flow path a formed between the outer pipe 1 and the middle pipe 2 of the triple pipe, and a center flow path C inside the inner pipe 3, and passes through the partition chamber. 5 and the fluid A in the partition chamber 5
On the other hand, when fluid B flows into the partition chamber 5 from the fluid B entrance and exit port 11 of the partition chamber 5, it passes through the intermediate flow path formed between the middle pipe 2 and the inner pipe 3. The structure is such that the fluid A is heat exchanged through both wall surfaces of the inner tube 3 and the middle tube 2 in contact with each other and flows out from the fluid B inlet/outlet 9 of the partition chamber 4. In this case, the fluid A is transferred to the fluid A inlet/outlet of the partition chamber 5. 10 and outflow from the fluid A inlet/outlet 8 of the partition chamber 4.Furthermore, since heat exchange may be performed between fluid A and fluid B in either counter flow or parallel flow state, fluid B may also be partitioned. The fluid B may flow in through the fluid B inlet/outlet 9 of the chamber 4 and flow out through the fluid B inlet/outlet 11 of the partition wall 5, or vice versa.

FIG. 3 shows another embodiment of the structure for branching the fluid A, in which both ends of the inner pipe 3 engaged with the partition chambers 4 and 5 pass through the partition chamber outer passage 6 and enter the fluid A inlet/outlet. 8 and 10
A small hole 6 is formed in the inner tube 3 facing the outer passage 6 of the partition.
A part of the fluid A that flows into the inner tube 3 branches from the small hole 6' to the outer passage 6 of the partition chamber, flows out, passes through the outer passage a, and flows out from the small hole 6'. Fluid A passes through the central flow path C in the inner tube 3 and flows through the outer flow path a in the partition chamber 5.
The structure is such that the fluid A that has passed through the center flow path C and the fluid A that has passed through the center flow path C join together.

Further, the structure of the partition is such that, as shown in FIG. It is also possible to adopt a structure in which an inlet/outlet 8' is separately provided and a branched portion where the fluid A inlet/outlet 8 communicates with the central passage 7 of the partition chamber.

Figure 5 shows a three-layer structure in which fluid A is passed through the central flow path C or outer flow path a, made a U-turn, returned from the outer flow path a or the center flow path C, and exchanged heat with fluid B passing through the intermediate flow path. Partitions 4 and 5 in which the outer tube 1, middle tube 2 and inner tube 3 of the tube are engaged
This structure shows a structure in which the partition chamber outer passage 6 and the partition chamber central passage 7 are partitioned in the partition chamber 4, and a fluid A inlet/outlet 8' communicating with the partition chamber outer passage 6 is separately provided in the side wall of the partition chamber 4. The fluid A inlet/outlet 8 communicates with the partition center passage 7, the partition outer passage 6 of the partition 5 communicates with the partition center passage 7, and the fluid A inlet/outlet 10 of the partition 5 communicates with a blind plug. 24, etc., and the fluid A flows in from the fluid inlet/outlet 8 or 8' of the partition chamber 4, passes through the center passage 7 of the partition chamber or the outer passage 6 of the partition chamber, and then enters the center flow path C or the outer flow path. When it passes through a and reaches the partition 5, it flows out into the partition center passage 7 or the partition outside passage 6 in the partition 5, makes a U turn, passes through the outside passage a1 or the central passage C, and enters the partition. 4 and flows out from the fluid A inlet/outlet 8' or 8.

On the other hand, since fluid B flows in from fluid B inlet/outlet 11 or 9 and flows out from fluid B inlet/outlet 9 or 11, fluid A and fluid B
Heat exchange is performed with

Fig. 6 shows a structure in which the middle pipe 2 and the inner pipe 3 are engaged and fixed to the partition chamber 4 by the tube expansion method, and 12 is a screw at the end opening on the opposite side to the fluid A inlet/outlet 8 of the partition chamber 4. Or an outer tube connection part where the ends of the outer tube 1 are joined by welding or the like,
Reference numeral 13 denotes a middle pipe 2 which is opened to the outer pipe 1 side of the partition part that separates the partition intermediate passage 7' provided in the partition chamber 4 from the partition outer passage 6 in the partition chamber 4. This is the middle tube expansion hole portion to which the tube is fixed, and the end of the smooth circular tube of the middle tube 2 inserted into the outer tube 1 is inserted into this middle tube expansion hole portion 13, and the fluid A is inserted into the middle tube expansion hole portion 13.
The tube is expanded and fixed by a tube expansion tool inserted through the entrance/exit port 8.

14 is a partition part where the middle pipe 2 is expanded and fixed, and a fluid A inlet/outlet 8
A bushing fitting hole 15 is a bushing fitting hole 14 for expanding and fixing the inner tube 3 which is opened in the partition between the
The end of the smooth circular tube of the inner tube 3 inserted into the middle tube 2 is inserted into the bushing fitting hole 14, and the inner tube of the bush 15 is fixed to the inner tube by means of screws, crimping, etc. The tube is expanded and fixed to the circumferential surface using a tube expansion tool inserted from the fluid A inlet/outlet 8.

Similarly, the outer tube 1, the middle tube 2, and the inner tube 3 are engaged in the partition chamber 5 to form a triple tube.

FIG. 7 shows a structure in which the middle tube 2 and the inner tube 3 are fixedly attached to the partition chamber 4 by an O-ring method, and the end of the outer tube 1 is connected to the fluid A of the partition chamber 4 as in FIG. It is connected to the outer pipe connection part 12 at the end opening opposite to the entrance/exit 8 by screws or welding, and the end of the smooth circular pipe of the middle pipe 2 inserted into the outer pipe 1 is connected to the inside of the partition chamber 4. The middle pipe O-ring is inserted into an opening provided on the outer pipe 1 side of the partition that partitions the partition chamber intermediate passage 7' from the partition chamber outer passage 6, and is provided on the inner peripheral surface of this opening. The middle tube 2 is engaged and mounted with an O-ring 17 for the middle tube inserted into the groove 16.

The end of the smooth circular tube of the inner tube 3 inserted into the inner tube 2 is inserted into the opening of the partition in the partition chamber 4 between the partition and the fluid A inlet/outlet 8, and The inner tube O-ring 19 is fitted into an inner tube O-ring groove 18 provided on the inner peripheral surface.

In this way, the middle pipe 2 and the inner pipe 3 are engaged and assembled in a watertight manner with the O-ring 17 for the middle pipe and the O-ring 19 for the inner pipe, and the outer pipe 1, the middle pipe 2, and the inner pipe 3 are similarly engaged in the partition chamber 5. They are combined to form a triple pipe.

When the middle pipe 2 and the inner pipe 3 are engaged with each other by the middle pipe O-ring 17 and the inner pipe O-ring 19 in this way, the middle pipe 2
The inner tube 3 is slidable in the axial direction, and even if the tube expands and contracts due to heat from fluid, the expansion and contraction is absorbed.

20 and 21 are the intermediate passage 7' of the partition and the outer passage 6 of the partition
The middle pipe stopper and the inner pipe stopper are attached to the partition part separating the inner pipe and the inner pipe, and stop the range in which the middle pipe 2 and the inner pipe 3 extend and slide within a predetermined sliding range.

22 is an air vent plug attached to the air vent provided in the upper part of the partitions 4 and 5 as shown in FIG.
23 is a drain plug attached to a drain port provided at the bottom of the partition chamber 4 or 5.

In this way, the triple tube type heat exchange unit according to the present invention has the outer tube 1, the middle tube 2, and the inner tube 3 fixedly attached to the partition chambers 4 and 5. The pipe diameter of the inner pipe 3 is determined based on the flow rate and pressure loss of the fluids A and B that exchange heat, as well as the flow rate ratio of the fluid A passing through the outer flow path a and the center flow path C, and the outer pipe 1 and the middle pipe 2. , the heat transfer area of the inner tube 3, the heat transfer coefficient, and the like.

When heat exchange is performed by passing two fluids, fluid A and fluid B, in the triple pipe heat exchange unit according to the present invention having such a structure, fluid A is passed through the fluid A inlet/outlet 8, 8' of the partition chamber 4 or the partition. The fluid A flows in through the fluid A inlet/outlet 10 of the chamber 5 and flows out through the fluid A inlet/outlet 10 or the fluid A inlet/outlet 8.8'. For example, if fluid A flows in through the fluid A inlet/outlet 8, 8' of the partition chamber 4, Fluid A passes through the triple pipe through the following flow path.

(1) When the partition chambers 4 and 5 have a structure as shown in FIG. 2 or 3, the fluid A flowing in from the fluid A inlet/outlet 8 is branched into the partition chamber outer passage 6 and the partition chamber center passage 7, Fluid A branched to the partition chamber outer passage 6 passes through the outer passage a, and fluid A branched to the partition chamber center passage 7 passes through the center passage C and merges in the partition chamber 5, where the fluid A is inlet and outlet. It flows out from 10.

(2) When the partition chamber 4 has a structure as shown in FIG. 2 or 3 and the partition chamber 5 has a structure as shown in FIG. The fluid A is branched into two, passes through the outer flow path a and the center flow path C, reaches the partition chamber 5, and flows out from the fluid A inlet and outlet ports 8 and 8', respectively, without merging in the partition chamber 5.

(3) When the partition chambers 4 and 5 have a structure as shown in FIG.
The liquid passes through the partition chamber 5, reaches the partition chamber 5, makes a U-turn within the partition chamber 5, passes through the outer flow path a, and flows out from the fluid A inlet/outlet 8' of the partition chamber 4.

(4) When the partition chambers 4 and 5 have a structure as shown in FIG. The fluid A makes a U-turn inside, passes through the central flow path C, and flows out from the inlet/outlet port 8 of the partition chamber 4.

On the other hand, fluid B may be caused to flow in from the fluid B inlet/outlet 9 of the partition chamber 4 and flow out from the fluid B inlet/outlet 11 of the partition chamber 5, or conversely, may be caused to flow in from the fluid B inlet/outlet 11 of the partition chamber 5 to cause the fluid B to flow out from the fluid B inlet/outlet 11 of the partition chamber 5. The fluid B is made to flow out from the inlet/outlet 9 and the flow relative to the fluid A is made into a counter flow or parallel flow and is passed through the intermediate flow path.

In this way, when fluid A is passed through the outer flow path a and the center flow path C, and fluid B is passed through the middle flow path, fluid A and B are passed through both walls of the inner tube 3 and the middle tube 2. Heat exchange is performed with

As described in detail above, the triple tube heat exchange unit according to the present invention is formed of an outer tube 1, a middle tube 2, and an inner tube 3, and the outer channel is one of the three channels partitioned by the tube wall of the base tube. It has a structure in which fluid A is passed through a and central flow path C, and fluid B is passed through an intermediate flow path to exchange heat between the two fluids. Since each tube is a spiral tube, it has the following advantages.

(1) It has a simple structure, can be incorporated into piping as a heat exchanger for a small volume of fluid, and can be easily connected to piping.

(2) Piping can be assembled in series, parallel, or in combination with series and parallel using multiple triple-pipe pipes, depending on specification conditions such as heat exchange, flow rate, and pressure loss, making it easy to standardize.

(3) Compared to the double pipe type, the heat transfer area per length is doubled,
The heat transfer coefficient of the three channels partitioned by the base pipe increases, and the heat exchange capacity is doubled.

(4) Since the middle tube 2 and the inner tube 3 are composed of helical tubes, the overall heat transfer coefficient is improved, and expansion and contraction of the tubes can be absorbed by the helical tubes, making the structure simple and compact. can do.

(5) By adopting the spiral tubes of the middle tube 2 and the inner tube 3 whose twist directions are opposite to each other, the heat transfer in the intermediate flow path is improved by the turbulence effect, and the heat transfer performance is significantly improved. .

(6) By passing a high viscosity fluid through the intermediate flow path, uniform heating and cooling can be performed from both heat transfer wall surfaces.

(7) Since the structure allows the triple pipe to be easily attached to the single partition chambers 4 and 5, it can be manufactured in a small size, and the piping space and installation space can be reduced.

(8) Triple pipes can be used in a straight pipe shape, a coiled pipe shape, or a curved pipe shape.

As described above, the triple-tube heat exchange unit according to the present invention has various advantages over conventional multi-tube or double-tube heat exchange units, and has great practical value.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of an example of a conventional double-pipe heat exchanger, and Fig. 2 is a partially sectional side view of an example of a triple-pipe heat exchange unit according to the present invention. Side view in section, 3rd
4 and 5 are side sectional views respectively showing other embodiments of the partition in which the triple tubes of the triple tube heat exchange unit according to the present invention are engaged, and FIG. FIG. 7 is a side sectional view showing an embodiment of the triple tube heat exchange unit in which the triple tubes of the triple tube heat exchange unit according to the present invention are engaged in the tube expansion method. FIG. 3 is a side sectional view showing one embodiment in an engaged state. 1... Outer pipe, 2... Middle pipe, 3... Inner pipe, 4, 5... Partition chamber, 6... Partition room outer passage. , 6'...Small hole, 7...Partition center passage 7'...Partition middle passage, 8.8'
, 10... Fluid A inlet/outlet, 9.11...
・Fluid B inlet/outlet, 12...Outer pipe connection part, 13・
...Medium tube expansion hole, 14...Bushing fitting hole, 15...Bushing, 16...
Groove for middle pipe O-ring, 17...O-ring for middle pipe,
18... Groove for inner tube O-ring, 19...
O-ring for inner tube, 20...Inner tube stopper, 2
1... Inner pipe stopper, 22... Air vent plug, 23... Drain vent plug, 24...
...Blind plug, a...Outer flow path, b...
...Middle flow path, C...Center flow path, A, B...
···fluid.

Claims (1)

[Claims for Utility Model Registration] ■ A triple pipe is formed by an outer pipe 1 having a predetermined pipe diameter, an inner pipe 2 and an inner pipe 3 which are circular pipes with smooth ends and have a hole between the ends of the spiral pipe. Three flow paths are provided: an outer flow path a between the outer tube 1 and the middle tube 2, an intermediate flow path b between the middle tube 2 and the inner tube 3, and a center flow path C within the inner tube 3. Both ends of the outer tube 1, the middle tube 2, and the inner tube 3 are respectively engaged with single partition chambers 4 and 5 into which two fluids A and B flow into or out, and the partition chamber 4
and 5 are provided with a partitioned chamber outer passageway 6 communicating with the outer passageway a, a partitioned chamber central passageway 7 communicating with the central passageway C, and a partitioned chamber intermediate passageway 7' communicating with the intermediate passageway A. A triple tube heat exchange unit featuring: 2. The triple-pipe heat exchange unit according to claim 1, wherein the helical tube of the middle tube 2 and the helical tube of the inner tube 3 are combined so that the helical twist directions are the same as each other. 3. The triple-tube heat exchange unit according to claim 1, wherein the spiral tube of the middle tube 2 and the spiral tube of the inner tube 3 are combined with the twist directions of the spirals opposite to each other. 4. The triple tube heat exchange unit according to any one of claims 1 to 3 of the utility model registration claim, in which the outer tube 1, the middle tube 2, and the inner tube 3 are assembled concentrically. . 5. The triple tube heat exchanger according to any one of claims 1 to 3 of the utility model registration claim, in which the outer tube 1, the middle tube 2, and the inner tube 3 are assembled in a non-concentric manner. unit.