JPH01302098A - Multi-tube type heat exchanger - Google Patents

Abstract

PURPOSE:To uniformly feed heat exchanging medium to the outer periphery of a each fine tube in a laminar flow state, and to improve heat exchanging efficiency by interposing a partition wall for guiding the medium input from an inlet to a connection hole for connecting it to the inside and outside of a cylinder. CONSTITUTION:A plurality of cylindrical partition walls 6 for feeding heat exchanging medium input from an inlet 11 into a casing 1 in a laminar flow along the longitudinal direction of fine tubes 3 to guide it to a connection hole 21 are interposed. The medium fed from an inlet 13 is fed to an extraction port 14 through the tubes 3, and the medium fed from the inlet 11 into the casing 1 is guided by the walls 6, and fed to an outlet 12 in a laminar flow state. The medium guided by the walls 6 is not deflected in the laminar flow state, the medium is preferably brought into contact with the tubes 3 to improve heat transfer efficiency at the outer peripheries of the tubes 3, thereby preferably heat exchanging to the medium fed in the tubes 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a so-called shell-type multi-tube heat exchanger equipped with a large number of thin tubes.

(Prior Art) Conventionally, this type of multi-tube heat exchanger has been proposed by the applicant in Japanese Patent Application No. 1983-274285 (November 1, 1986).
Also, as shown in Figure 3, a casing (1) equipped with an inlet (11) and an outlet (12) for the heat exchange medium is made of synthetic resin. A large number of long thin tubes (3) consisting of
), with both end openings open, and the first and second bundles made of resin (B) (C
), and the focusing bodies (B) and (C) define the opening side of each of the thin tubes (3) as the inside of the casing (1), while the opening side of each of the thin tubes (3) The heat exchange medium inlet (13) and extraction port (
14).

Further, a plurality of the support plates (A) have approximately the same diameter as the inner diameter of the casing (1).
1), and the remaining plurality of pieces have a diameter smaller than the inner diameter of the casing (1).
These casings (1) with a predetermined gap between them.
A flow path for the heat exchange medium is formed between the inner wall of the support plate (A) and the support plate (A).

Then, from the introduction port (13) to the casing (1)
As shown by the dotted arrows in the figure, the heat exchange medium introduced into the inside of the tubes (3) flows to the extraction port (14), and also flows through the intake port (11). ) into the casing (1), the heat exchange medium flows around the outer periphery of each of the capillary tubes (3) and exits from the outlet (12) as shown by the solid arrow in the figure. At this time, heat exchange is performed between the heat exchange medium and the medium to be heat exchanged.

(Problem to be Solved by the Invention) However, in the above shell-and-tube heat exchanger, the intake port (1
The heat exchange medium taken into the casing (1) from 1) and advected to the outlet (12) flows uniformly around the outer periphery of each capillary tube (3), and during advection Since drifting (a) occurs at
The heat exchange medium in contact with the outer circumferential side of the thin tube (3) and each of the wire tubes (
3), the heat transfer coefficient between the two was low, and sufficient heat exchange could not be performed.

In particular, when each of the thin tubes (3) is made of synthetic resin,
Since the thermal conductivity of each wire tube (3) itself is extremely low compared to those made of metal, the above problem becomes even more remarkable. Usually, in such resin-made products, the wall thickness of each thin tube (3) is made thinner, or carbon or the like is mixed into the resin material to improve the thermal conductivity of each wire tube (3) itself. Therefore, efforts have been made to reduce the thermal resistance within the wall thickness of each of the thin tubes (3), but even if these thin tubes (3) are improved in terms of their material, the thin tubes (3) as described above are Since the heat transfer coefficient between the outer periphery and the heat exchange medium is low, no substantial improvement can be achieved.

Let's consider the above in a little more detail.

As shown in FIG. 4, when considering the heat transfer in the thin tube (3), the overall heat transfer coefficient (I) is expressed by the following equation.

1/KI= l/hl+ 1/ (Rho) + 1/
(λ/1) where, hl; heat transfer coefficient inside the tube (heat transmission coefficient) ho; heat transfer coefficient outside the tube (heat transmission coefficient) R: ratio of heat transfer areas inside and outside the tube λ; thermal conductivity of the resin capillary t ;Wall Thickness From the above equation, in order to improve the overall heat transfer coefficient (I), it is sufficient to increase the denominator of each term on the right side.
) and improving thermal conductivity (λ) by incorporating carbon, only the third term can be improved. Every time(
Since λ) is low, there is little effect on the overall heat transfer coefficient, so no substantial improvement in the overall heat transfer coefficient (Kl) can be expected. It is thought that the area ratio (R) can be made infinitely close to 1 by reducing the wall thickness (1), but the thin tube (3)
In order to ensure pressure resistance, the increase is suppressed to a very small extent, and the denominator of the second term, that is, the product (Rho) with the tube outside heat transfer coefficient (hO), is not substantially improved. Furthermore, in the above equation, since the medium to be heat exchanged flowing inside the thin tube (3) is considered to be in a plug flow state, the denominator (hl) of the first term on the right side is originally large.

Therefore, in order to improve the overall heat transfer coefficient (Kl),
There is a need to improve the second term on the right side, that is, to improve the heat transfer coefficient (ho) at the outer periphery of the thin tube (3).

Therefore, it is an object of the present invention to uniformly distribute the heat exchange medium around the outer circumference of each capillary tube in a plug flow state without causing any uneven flow in the heat exchange medium transferred from the inlet to the outlet in the casing. The object of the present invention is to provide a shell-and-tube heat exchanger that can improve heat exchange efficiency by allowing the heat exchange medium to circulate through the wire tubes and efficiently exchanging heat with the heat exchange medium that is advected in each of the wire tubes. .

(Means for Solving the Problems) Therefore, a cylindrical body (2) is installed inside a casing (1) having an intake port (11) for a heat exchange medium on the outer periphery, and this cylindrical body (2) A communication hole (2) that communicates between the inside and outside of the cylinder (2)
1), the inside of this cylindrical body (2) is communicated with the outlet (12) for the heat exchange medium, and a thin tube (3) is arranged around the cylindrical body (2). 3) At both ends of
Inlet (13) and extraction port (14) for the heat exchange medium
The heat exchange medium taken in from the intake port (11) is passed along the length of the capillary (3) through the capillary (3).
3) is interposed with a partition wall (6) that allows the flow to flow in a plug-like manner and guides it to the flow hole (21).

Furthermore, an inlet (1) is provided at the end of the thin tube (3) in the above configuration.
A guide path (15) is formed to guide the heat exchange medium from the thin tube (3) toward the extraction port (14) by inverting the tube several times along the length of the thin tube (3).
3) An improvement was made in which an inverted flow path (30) for the heat exchange medium was formed in the length direction.

In addition, the partition wall (6) allows the heat exchange medium to be reversed and guided multiple times along the length direction of the thin tube (3) in correspondence with the reversal flow path (30) for the heat exchange medium. Improvements were also made to define the taxiway (60).

Furthermore, an improvement was made in which the flow direction of the heat exchange medium through the partition wall (6) and the flow direction of the heat exchange medium flowing through the thin tube (3) are made to be opposite to each other.

(Function) The heat exchange medium introduced from the inlet (13) is distributed to the extraction port (14) through the inside of each capillary (3), and
The heat exchange medium taken into the casing (1) from the intake port (11) is guided by the partition wall (6) and then flows through the intake port (1).
2) It is distributed in a plug flow state to the side. The heat exchange medium guided by the partition wall (6) is in a plug flow state and does not cause uneven flow, and good contact between the heat exchange medium and each of the capillary tubes (3) is achieved, and each axis The heat transfer coefficient at the outer periphery of the tube (3) can be improved, and good heat exchange can be performed with the medium to be heat exchanged flowing through the inside of each of the thin tubes (3).

Further, the heat exchange medium flowing from the inlet (13) toward the extraction port (14) is applied to the end of each capillary (3) multiple times along the length of each capillary (3). When forming a guide path (15) for circulating and guiding the heat exchange medium by inverting the casing (1) to form a reversing flow path (30) for the heat exchange medium, the casing (1)
The flow path for the heat exchange medium can be lengthened without increasing the overall length of the partition wall (8).
) can increase the contact area with the heat exchange medium induced by
Even better heat exchange can be performed.

Furthermore, partition! l! (8), the reversal guide path (6) of the heat exchange medium is made to correspond to the reversal flow path (30) of the heat exchange medium.
0), it is possible to ensure a long plug flow path length for the heat exchange medium guided to the reversal guideway (60), and increase the flow velocity, so that it corresponds to the reversal guideway (60). Even better heat exchange can be performed with the heat exchange medium flowing through the reversing flow path (30).

Furthermore, the flow direction of the heat exchange medium through the partition wall (6);
When the flow direction of the heat exchange medium flowing through each thin tube (3) is made to be opposite to each other and the heat exchange medium and the heat exchange medium are made to flow in opposite directions, the heat exchange medium and the heat exchange medium are It is possible to perform even better heat exchange with the medium.

(Example) The shell-and-tube heat exchanger shown in FIG.
A), and first and second lids (IB) and (IC) each airtightly attached to each opening side of the cylindrical body (IA), and the outer circumferential portion of the cylindrical body (IA) An intake port (11) for the heat exchange medium is provided on the negative side in the length direction, and an outlet port (12) is provided on the other side in the length direction, and the medium to be heat exchanged is introduced into the first lid body (IB). mouth (13), and the second
Each lid (IC) is provided with an extraction port (14).

Further, an elongated cylinder (2) is disposed at the inner center of the casing (1), and the first lid (IB) is disposed on the negative side in the length direction of the cylinder (2). ) side, a plurality of communication holes (21) are formed to communicate the inside and outside of the cylinder (2), and the communication holes (21) are connected to the outlet (12), and the cylinder ( A large number of long thin tubes (3) made of synthetic resin are arranged on the outer periphery of 2).

For example, the following resin materials are used for the thin tube (3). Further, its outer diameter is about 0.2 to 3-cm.

■FEP: Tetrafluoroethylene/hexafluoropropylene copolymer ■PFA: Tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer ■ETFE: Tetrafluoroethylene/ethylene copolymer ■PVdF: Vinylidene fluoride polymer or the above-mentioned capillary Carbon or the like is mixed into the resin material (3) to increase the thermal conductivity of the thin tube (3) itself.

Furthermore, each of the thin tubes (3) is formed into a circular bundle by means of first and second bundles (4) and (5) made of resin, respectively, so that both ends of the thin tubes (3) are open at both ends. and each of these bundles (4) and (5) is attached to the casing (1).
) The first and second lids (IB) and (IC) are airtightly inserted into the interior of the cap through a seal ring (R) to open both end openings of each of the thin tubes (3). The inside is defined as the inside of the cylindrical body (IA), and the second focusing body (5) defines one lengthwise end side of the cylindrical body (2) with the side where the communicating hole (21) is formed. closes the opposite side to prevent the heat exchange medium taken in from the intake port (11) of the casing (1) from being short-circuited and introduced into the inside of the cylinder (2), and The medium is inserted into the intake port (11)
The other end of the cylindrical body (2) in the length direction is made to protrude outward from the first lid body (IB), and this protrusion The outlet (12) is formed at the portion.

Then, the intake port (
The heat exchange medium introduced from 11) is transferred to each capillary tube (3).
) to flow like a plug flow along the length direction of the communication hole (
21) A plurality of cylindrical partition walls (6) leading to
Interpose.

The partition wall (6) is constructed using, for example, a resin-filled nonwoven fabric that does not allow water to pass through, a resin sheet, etc., and as shown in FIG. In order to form a reversal guide path (60) for the heat exchange medium in correspondence with a reversal flow path (30) for the heat exchange medium to be described later, a small diameter wall is provided in the middle of the concentric circles. Cylindrical second partition wall (6b) and third partition! ! ! (6c
). If these first to third partition walls (ea to 6C) are interposed, a reversing guideway (60) for one and a half reciprocations will be formed, but in order to simplify the structure, the first partition wall If only (6a) is installed, a plug flow guide path for the roadway from the intake port (11) to the communication hole (21) will be formed.

Also, the end of the thin tube (3), that is, each bundle (4) (5)
Large and small cylindrical partition bodies (41) (51) are arranged at the ends of the lid body (IB) (IC), and the inside of each lid body (IB) (IC) is divided into concentric chambers (a+b+e+d, e, f). The introduction port (13) is connected to the chamber (a) on one end of the outermost periphery, and the extraction port (14) is connected to the chamber (f) on the other end of the innermost periphery, and each of the other adjacent By making the chambers (b+c) (d, e) communicate with each other through the communication holes (45), the heat exchange medium introduced from the introduction port (11) is reversed twice and transferred to the extraction port. A guide path (15) is formed to guide the flow of the heat exchange medium to (14), and a reversal flow of the heat exchange medium over one and a half round trips is formed inside the thin tube (3) in the length direction of the shaft (3). Road (3
0) is formed. In this way, the heat exchange area of the heat exchange medium to the heat exchange medium can be expanded without increasing the length of the casing (1).

Further, in this case, each of the lanes (31, 32, 33) of the reversing flow path (30) formed by the guide path (15) and the first
- Each lane (61°82.63) of the reversing guideway (60) formed by the third partition wall (E3a to 8b) is provided concentrically with each other, and these reversing flow paths (
The heat exchange medium flowing through the reversing guideway (60) and the heat exchange medium flowing through the reversing guideway (60) are arranged to flow in opposition to each other.

In the above configuration, from the intake port (11) to the cylindrical body (IA
), the heat exchange medium taken in is reversed by each partition wall (8a to 6c) and flows along the reversal guide path (60) in a plug flow state to the outlet (12), as shown by the solid line arrow in FIG. ) side, and the heat exchange medium introduced from the inlet (13) on the - side is guided to the guide path (1) as shown by the dotted arrow in the figure.
5), the extraction port (14
), and by improving the heat transfer coefficient on the outer peripheral side of each thin tube (3) and increasing the heat exchange area between the heat exchange medium and the heat exchange medium, the device The heat exchange efficiency can be significantly increased while the overall size can be made smaller.

(Effects of the Invention) As described above, in the present invention, the heat exchange medium intake (11
), a cylindrical body (2) is installed inside the casing (1), and a communication hole (21) is provided in the cylindrical body (2) to communicate the inside and outside of the cylindrical body (2). (2) is communicated with the heat exchange medium outlet (12), and the cylindrical body (2)
), a large number of thin tubes (3) are arranged around the thin tube (3).
An inlet (13) and an extraction port (14) for the heat exchange medium are provided at both ends of the tube, while a heat exchange medium is taken in from the intake port (11) along the length of the thin tube (3). is caused to flow through the thin tube (3) in a plug-like manner to form the flow hole (21).
Since the partition wall (6) is provided to guide the heat exchange medium into the casing (1), the heat exchange medium can be brought into good contact with the capillary tube (3) without causing a drift during the flow of the heat exchange medium in the casing (1). , the heat transfer coefficient at the outer circumference of the thin tube (3) can be improved, and good heat exchange can be achieved between the heat exchange medium and the heat exchange medium flowing through the inside of the thin tube (3). This can improve heat exchange efficiency.

Further, the heat exchange medium flowing from the inlet (13) toward the extraction port (14) is applied to the end of the thin tube (3) multiple times along the length of the thin tube (3). When forming a guide path (15) for inverted circulation guidance and forming a reversing flow path (30) for the heat exchange medium, it is possible to make the device compact and to lengthen the flow path for the heat exchange medium. The contact area of the heat exchange medium to the heat exchange medium can be increased, and even better heat exchange can be performed.

Furthermore, the partition wall (6) provides a reversal flow path (
30), when defining the reversing guide path (60) for the heat exchange medium, a long plug flow path length for the heat exchange medium guided to the reversing guide path (60) can be ensured, and the flow rate can be increased. can be carried out quickly, good heat exchange can be performed for a month between the reversing guide path (60) and the heat exchange medium flowing through the corresponding reversing flow path (30), and the heat exchange efficiency can be significantly increased.

Furthermore, the flow direction of the heat exchange medium through the partition wall (6) and the flow direction of the heat exchange medium flowing through each of the thin tubes (3) are made to be opposite to each other, so that the heat exchange medium and the heat exchange medium When the heat exchange medium and the medium to be heat exchanged are made to flow facing each other, the heat exchange between the heat exchange medium and the medium to be heat exchanged can be further promoted, and the heat exchange efficiency can be further improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the shell-and-tube heat exchanger of the present invention, Figure 2 is a cross-sectional view of the multi-tube heat exchanger, Figure 3 is a side sectional view of the conventional example, and Figure 4 shows heat exchange near the thin tubes. It is an explanatory diagram to explain. (1)...Casing (2)...Cylinder (3)...Thin tube (6)...Partition wall (11)...Intake (12)... Outlet port (13)...Inlet port (14)...Extraction port (15)...Guide path (21)...Flow hole (30)...Reverse flow path (60) )...Reverse taxiway

Claims (1)

[Scope of Claims] 1) A shell-and-tube heat exchanger equipped with a large number of thin tubes (3) through which a heat exchange medium whose heat is controlled by a heat exchange medium flows, the heat exchange medium being disposed on the outer periphery of the heat exchanger. A cylindrical body (2) is installed inside a casing (1) equipped with an intake port (11), and this cylindrical body (2) has a communication hole (
21), the inside of the cylinder (2) is communicated with the heat exchange medium outlet (12), and the cylinder (2)
The thin tube (3) is arranged around the thin tube (3), and the heat exchange medium inlet (13) and extraction port (
14) is provided, and the heat exchange medium taken in from the intake port (11) is caused to flow through the capillary tube (3) in a plug flow along the length direction of the capillary tube (3). ) A multi-tubular heat exchanger characterized in that a partition wall (6) is inserted to guide the heat exchanger. 2) At the end of the thin tube (3), connect the inlet (13) to the extraction port (
14), a guide path (15) is formed to guide the heat exchange medium by turning the heat exchange medium several times along the length of the thin tube (3), and 2. The multi-tubular heat exchanger according to claim 1, further comprising a reversing flow path (30) for the medium to be heat exchanged. 3) The partition wall (6) serves as a reversal flow path (30) for the medium to be heat exchanged.
a reversal guide path (6
3. The shell-and-tube heat exchanger according to claim 2, wherein the tube-and-tube heat exchanger defines: 0). 4) The multi-tubular heat exchanger according to claim 1 or 3, wherein the flow direction of the heat exchange medium through the partition wall (6) and the flow direction of the heat exchange medium flowing through the thin tubes (3) are opposed to each other. exchanger.