JP2510125Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat exchanger including a thin tube and a wire mesh.

(Prior Art) Conventionally, a so-called cross fin type heat exchanger in which a large number of fins are attached to a heat transfer tube in an orthogonal state has been known. In such a heat exchanger, the heat transfer performance is further improved. In order to achieve this, a slit or a louver is cut and raised in the fin, and the leading edge effect by these is utilized, which has already been proposed (for example, Jikho Sho 58).
See -49503 publication. By the way, in the case where the heat transfer performance is improved by forming the slits or louvers on the fins in this way, it is necessary to provide as many slits as possible within the limited width of the fins. For example, it is effective to make the width of slits as narrow as possible, but there is a limit in terms of manufacturing technology or fin strength in narrowing the width of such slits. The current situation is that the upper limit has been reached.

From such a background, for example, in Japanese Utility Model Laid-Open No. 60-2186, from the viewpoint of achieving a dramatic improvement in heat transfer performance, it is similar to the case where the cutting width of slits is narrowed beyond its limit. There has been proposed a so-called mesh fin type heat exchanger that uses a wire mesh as a fin, which has an effect (a leading edge effect increasing effect).

(Problems to be solved by the invention) However, since the heat transfer tube that has been conventionally used in a cross fin type heat exchanger has a relatively large tube diameter (usually 8 to 10 mm), the reason will be described later. However, the characteristics of the mesh fins could not be fully utilized, resulting in dissatisfaction in improving the heat transfer performance.

That is, if the diameter of the heat transfer tubes is large, for example, when the pitch of each heat transfer tube is set to be the same, the ventilation resistance increases due to the increase in the wind speed between the heat transfer tubes, which increases the blowing power, resulting in higher cost and lower efficiency. Therefore, it is inevitable that the pitch is relatively large. However, when the pitch is increased, the heat exchanger itself becomes large and the compactness is impaired.

In view of this, the present invention proposes, in a heat exchanger using a wire mesh as a fin, to maximize the characteristics of the wire mesh to obtain higher heat transfer performance, and at the same time, to make the heat exchanger compact and improve the degree of freedom in design. It is a matter of illustration.

(Means for Solving the Problem) In the present invention, the following configuration is adopted as a specific means for solving the problem.

In the device according to claim 1, as illustrated in FIGS. 2 and 3, a plurality of heat transfer tubes 1, 1, each of which is composed of a thin tube and is arranged in a substantially matrix shape at a predetermined interval from each other.・
. Are bent in a wavy manner so that each has a bending width approximately corresponding to the tube diameter, and these plural heat transfer tubes 1, 1 ,.
Of the heat transfer tubes 1,1, ..., which are arranged toward one side in two substantially orthogonal directions, and the peaks of the heat transfer tubes 1,1 ,,,, which are arranged toward the other side. The knitted body 2 formed by knitting in a net shape so that the portions 1b correspond to each other in the bending width direction, and the heat transfer tubes 1, 1, ... On the other hand, it is characterized in that it is provided with a wire net 3 that is in contact with and fixed to each of the valleys 1a and the peaks 1b.

According to the second aspect of the invention, as shown in FIGS. 4 and 5, a plurality of first heat transfer tubes 1A, 1A, ... The plurality of heat transfer tubes 1A, 1A, ... and the first wire nets 3A, 3A fixed in a spread state on both sides are integrally formed so as to have a bending width approximately equivalent to the tube diameter of the heat transfer tube 1. While being bent into a corrugated plate shape, a plurality of second heat transfer tubes 1B, 1B, ... Consisting of thin tubes and extending straightly are provided on both sides of the first wire mesh 3A, 3A ,.
The first heat transfer tubes 1A, 1A, ... are arranged so as to cross over the valleys 1Aa and the peaks 1Ab of the first heat transfer tubes 1A, 1A ,. The knitted body 2 and the first wire mesh, which are arranged outside the knitted body 2 in a laid state.
3A, 3A, ... Valley 3Aa and peak 3Ab, and the second heat transfer tube 1
Second contacting and fixed to B, 1B, ...
It is characterized by having wire meshes 3B, 3B ,.

(Operation / Effect of Invention) Since each invention of the present application has such a configuration, the following operation / effect can be obtained.

(A) Functions and effects common to the heat exchangers according to the first and second aspects of the invention (a-1) When the air flow passes through the heat exchanger, the wire mesh 3,3A, 3
In B, a high level of leading edge effect is obtained due to the airflow dividing action in each part of the wire rods that compose it, and in each heat transfer tube 1, 1A, 1B, these are thin tubes, so they are as large as conventional ones. Compared to the radial pipe, the airflow dividing action by the heat transfer tubes 1, 1A, 1B is large and a higher level leading edge effect is obtained, and the wire mesh 3, 3A, 3B and each heat transfer tube 1, 1A, 1B The difference in heat transfer coefficient between the two is made as small as possible, and as a result, a higher level of heat transfer performance is obtained and the device is made more compact when the required heat transfer performance is the same. It becomes possible.

(A-2) Since each heat transfer tube 1, 1A, 1B is configured to have a small diameter, the change in the pitch of the heat transfer tube 1, 1A, 1B has an effect on ventilation resistance. Compared to a certain case, the number of heat transfer tubes 1, 1A, 1B constitutes the mesh-shaped knitted body 2, so that the knitted body 2 is rich in flexibility and high in strength, whereby heat exchange is performed. The degree of freedom in designing the vessel is improved, and it can be easily applied to, for example, a new form of heat exchanger.

(A-3) Each heat transfer tube 1, 1, in the device according to claim 1.
.. and the first heat transfer tubes 1A, 1 in the device according to claim 2
Since both A and ... are bent in a wavy shape, the boundary layer between the refrigerant flowing inside the bent heat transfer tubes 1 and 1 and 1A and 1A and 1 ... It is disintegrated in the section and its development is suppressed as much as possible, and a higher level heat transfer performance is secured by promoting heat transfer on the side of each heat transfer tube 1, 1A.

(B) Specific effects of the heat exchanger according to the invention as defined in claim 1, the heat exchanger according to the invention as defined in claim 1
Since the heat transfer tubes 1, 1, ... Arranged in a substantially base shape are bent in a wave shape with a bending width corresponding to the diameter of the tube and knitted, and the wire nets 3, 3 are laid out on the outside thereof ( b-1) Valley sections 1a, 1a, ... and mountain section 1 of each heat transfer tube 1,1, ...
The tops of b, 1b .. ・ are almost at the same height. Therefore, by arranging the metal nets 3,3 here, the metal nets 3,3 can be made to have the above-mentioned heat transfer tubes 1,1,
··· The valleys 1a, 1a, · · and the ridges 1b, 1b, · · are contacted and fixed to the ridges 1b, 1b, · ·, respectively, and the wire nets 3, 3 themselves maintain a flat shape. , 1, ... are wire mesh 3,3
On the other hand, the contact is made almost evenly over the entire area, and the equalization of the heat transfer coefficient is promoted, and higher heat transfer performance can be expected. (B-2) The wire nets 3 and 3 are flat on both sides of the knitted body 2. In order to maintain the shape, for example, when the knitted body 2 and the wire nets 3 and 3 constitute a heat exchange element and a plurality of heat exchange elements are arranged side by side in the thickness direction, one of the heat exchange elements is exchanged. The wire mesh 3 of the element can be used as it is as the wire mesh 3 of the other heat exchange element, and as a result,
By arranging the heat exchange elements side by side, it is easy to improve the heat transfer performance, and it is possible to achieve compactness in the thickness direction. (B-3) Heat transfer tubes 1, 1, ... By arranging the heat transfer tubes 1, 1 ... In between each heat transfer tube 1, 1, ..., A sufficient air passage extending in the thickness direction is secured between the heat transfer tubes 1, 1, ... The unique action and effect of can be obtained.

(C) In the heat exchanger according to the invention as defined in claim 2, the first wire nets 3A, 3A are arranged outside the first heat transfer tubes 1A, 1A, ... Then, these are bent integrally and in a wavy shape with a bending width corresponding to approximately the tube diameter of the heat transfer tube 1A, and the first heat transfer tubes 1A, 1A ,. The valleys 1Aa, 1Aa, ... of the first heat transfer tubes 1A, 1A, .. and the peaks 1Ab, 1Ab, .. Lined in parallel with the heat transfer tubes 1A, 1A ,. Since the straight second heat transfer tubes 1B, 1B, ... Are arranged to form the knitted body 2 and the third wire nets 3B, 3B are arranged on both sides of the knitted body 2 as well. , First heat transfer tubes 1A, 1A, ... and second heat transfer tubes 1B, 1B ,.
Both are in a state of being sandwiched by wire mesh 3A, 3B from both sides,
In addition, the wire mesh 3A and 3B are in line contact with each other over the entire length. As a result, (c-1) heat transfer tubes 1A, 1A, ... And 1B, 1B ,.
The contact area with A and 3B is increased, and the heat transfer coefficient is improved accordingly. (C-2) Heat transfer tubes 1A, 1A, ... and 1B, 1B ,.
Since the contact state with A and 3B is made as uniform as possible in the entire area of the knitting body 2, the equalization of the heat transfer coefficient is promoted and higher heat exchange performance can be expected, (c-3) knitting Since the second wire nets 3B, 3B respectively located on both sides in the thickness direction of the body 2 maintain a planar shape,
For example, when the knitted body 2 and the wire meshes 3B, 3B constitute a heat exchange element and a plurality of heat exchange elements are arranged in parallel in the thickness direction, the wire mesh 3B of one heat exchange element is directly used for the other heat exchange element. Can be shared as the wire mesh 3B, and as a result, the heat transfer performance can be easily improved by arranging the heat exchange elements side by side, and the size can be made compact. 4) When viewed from the thickness direction of the knitted body 2, the first heat transfer tubes 1A, 1A, ... And the second heat transfer tubes 1B, 1B ,. Heat transfer tubes 1A, 1A, ... and 1B, 1
B, ··· There are sufficient air passages between them in the thickness direction, and the heat exchange performance can be expected to improve by that amount.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIG. 1 shows a heat exchanger Z according to an embodiment of the invention according to claim 1 of the present application. This heat exchanger Z is
A plurality of heat transfer tubes 1, 1, ... Composed of thin tubes (for example, a tube diameter of 5 mm or less) are knitted in a flat mesh shape, as will be described later, and spread on both sides of the knitted body 2. A plurality of plate-shaped heat exchange elements (10) composed of wire meshes (3, 3) fixed in an installed state are arranged back and forth in the thickness direction. Then, heat is exchanged by circulating air in the thickness direction of each of the heat exchange elements 10, 10 ,. In this embodiment, the heat exchanger Z is composed of a plurality of heat exchange elements 10, 10, ..., However, depending on the required heat transfer amount, only a single heat exchange element 10 may be used. Of course, Z can be configured.

The structure and operation of the heat exchange element 10 will be described below with reference to FIGS. 2 and 3.

The heat exchange element 10 is formed by alternately knitting a plurality of heat transfer tubes 1, 1, ... Arranged longitudinally and laterally at a predetermined interval and bending them with a bending width substantially corresponding to the tube diameter to woven a knitted body 2 Wire meshes 3, 3 which function as fins are fixed on the both surfaces of the knitted body 2 while being formed.

In the heat exchange element 10 thus constructed, the wire mesh 3 has a high level of structure because its original structure is equivalent to a structure in which the cutting width of the slits or the like provided in the conventional fins is extremely miniaturized. Of course, the leading edge effect is obtained, but in this embodiment, not only the wire mesh 3 but also the heat transfer tubes 1, 1, ... The leading edge effect is obtained, and higher heat transfer performance is ensured by the synergistic effects of these.

In addition, the knitted body 2 includes the heat transfer tubes 1, 1, ...
・ Because it is woven in a net shape, it is possible to change the pitch of each heat transfer tube 1,1 ,.
This can be easily performed while suppressing an increase in ventilation resistance as much as possible. Therefore, each heat transfer tube is used in accordance with the type or heat exchange capacity of the heat exchanger to which the heat exchange element 10 is applied.
It is possible to deal with this by arbitrarily changing the pitch of 1,1, ...

Further, in this heat exchange element 10, each heat transfer tube
Even if 1,1, ... are composed of thin tubes of relatively weak strength by themselves, these are woven in a vertical and horizontal mesh shape, and moreover, this is sandwiched by the wire mesh 3,3 from both sides,
It has sufficient strength and has appropriate flexibility. Such characteristics increase the degree of freedom in designing the heat exchanger and are significant in product planning.

Further, each heat transfer tube 1, 1, ... Has a shape bent into a wavy shape by being woven in a net shape. As a result, in each heat transfer tube 1, 1, ..., The boundary layer between the refrigerant flowing inside and the inner surface of the tube is collapsed at each bent portion, so that the boundary layer can be developed as much as possible. The heat transfer is promoted on each side of the heat transfer tubes 1, 1, ..., and a high level of heat transfer performance is secured.

In addition, since the heat transfer tubes 1, 1, ... Arranged in a substantially base shape are bent in a wave shape with a bending width equivalent to the diameter of the tube and knitted, and the wire nets 3, 3 are laid out on the outside thereof. ,
The tops of the valleys 1a, 1a, .. of the heat transfer tubes 1, 1, .. And the peaks 1b, 1b .. are almost at the same height. Therefore, by arranging the metal nets 3, 3 there, 3 and 3 are the above heat transfer tubes 1, 1 ...
a, 1a, ... and the ridges 1b, 1b, .. are respectively fixed in contact with each other, and the wire nets 3, 3 themselves maintain a flat shape, so that each heat transfer tube 1, 1 ,. Contacts the wire nets 3 and 3 almost uniformly over the entire area, which promotes equalization of the heat transfer coefficient, and higher heat transfer performance can be expected.

Further, since the wire nets 3, 3 maintain a flat shape on both sides of the knitted body 2, for example, a plurality of heat exchange elements 10 composed of the knitted body 2 and the wire nets 3, 3 may be arranged in parallel in the thickness direction. In this case, the wire mesh 3 of one heat exchange element 10 can be used as it is as the wire mesh 3 of the other heat exchange element 10, and as a result, the heat transfer performance can be improved by arranging the heat exchange elements 10 in parallel. Easy and
It is possible to make the device compact in the thickness direction.

Second Embodiment FIGS. 4 and 5 show a heat exchange element 10 applied to a heat exchanger according to an embodiment of the invention set forth in claim 2 of the present application. This heat exchange element 10 has a plurality of first heat transfer tubes 1A, 1A, ... Composed of thin tubes lined up at a predetermined interval, and is sandwiched by a pair of first wire meshes 3A, 3A from both sides thereof to be integrated. After being made into a shape, it is bent into a corrugated plate shape with a bending width substantially equivalent to the tube diameter, and the heat transfer tubes 1 on the both sides of the first wire nets 3A, 3A are bent.
A, 1A .. .., a bent portion that extends in a direction substantially orthogonal to A, 1A ..., That is, the second portion formed of a thin tube across the valleys 1Aa, 1Aa, .. The heat transfer tubes 1B, 1B ... Are alternately arranged and fixed to form the knitted body 2, and the knitted body 2 is sandwiched by the second wire nets 3B, 3B from both sides thereof to be integrated. .

According to the heat exchange element 10 configured in this manner, each heat transfer tube 1A, 1A, ..., 1B, 1B ... , 1B, 1B
・ The pitch can be easily changed with the increase in ventilation resistance suppressed as much as possible. Each heat transfer tube 1A, 1A, ・, 1B, 1
Heat exchange element 1 composed of B, ... And each wire mesh 3A, 3B
Since 0 has strength performance and flexibility, and the first heat transfer tubes 1A, 1A, ... Have a bent shape, etc., the heat exchange element 10 according to the first embodiment described above. It is of course possible to obtain the same action and effect as the above, but in addition to this, it is possible to obtain a higher heat transfer performance than that of the above-mentioned embodiment due to the large number of wire meshes functioning as fins. There is an advantage that you can.

Also, the first heat transfer tubes 1A, 1A, ... And the second heat transfer tubes 1B, 1
Since the contact area between B, ... And the wire nets 3A, 3B is increased, the heat transfer coefficient is improved accordingly.

Furthermore, the first heat transfer tubes 1A, 1A, ... And the second 1B, 1B ,.
Since the contact state between the wire meshes 3A and 3B is made uniform as much as possible in the entire area of the knitted body 2, the equalization of the heat transfer coefficient is promoted, and higher heat exchange performance can be expected.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat exchanger according to a first embodiment of the present invention, FIG. 2 is a plan view of essential parts showing the structure of the heat exchange element shown in FIG. 1, and FIG. III-III sectional view, FIG. 4 is a plan view of essential parts showing a structure of a heat exchange element applied to a heat exchanger according to a second embodiment of the present invention, and FIG. 5 is a VV section in FIG. It is a figure. 1 ... Heat transfer tube 1a ... Valley of heat transfer tube 1b ... Heat transfer tube crest 1A ... First heat transfer tube 1Aa ... First heat transfer tube trough 1Ab ... First heat transfer tube crest Part 1B ...... Second heat transfer tube 2 ...... Knitted body 3 ...... Wire mesh 3A ...... First wire mesh 3Aa ...... First wire mesh valley 3Ab ...... First wire mesh ridge 3B ...... Second Wire mesh 10 ... Heat exchange element

Claims (2)

(57) [Scope of utility model registration request] 1. A plurality of heat transfer tubes (1), (1), ... Composed of thin tubes and arranged in a substantially grid pattern at a predetermined interval from each other. The heat transfer tube (1) which is bent in a wave shape so as to have a bending width and is arranged toward one side in two directions substantially orthogonal to each other of the plurality of heat transfer tubes (1), (1) ,. ，
(1), so that the valley portion (1a) and the heat transfer tubes (1), (1), ..., which are arranged toward the other side, correspond to each other in the bending width direction. A knitted body (2) formed by knitting in a net shape, and the valleys for the heat transfer tubes (1), (1), ... Arranged on both sides of the knitted body (2). Department (1a)
And a wire mesh (3) that is in contact with and fixed to each mountain portion (1b). 2. A plurality of first heat transfer tubes (1A), (1A), ... And a plurality of heat transfer tubes (1A), (1A), which are thin tubes and are arranged substantially parallel to each other at a predetermined interval. ..The corrugated plates integrally formed with the first wire nets (3A) and (3A) fixed to both sides of the heat transfer tube so as to have a bending width substantially corresponding to the tube diameter of the heat transfer tube (1) A plurality of second heat transfer tubes (1B), (1B), which are formed of thin tubes and extend straight on both sides of the first wire mesh (3A), (3A), ...・
, So as to intersect the first heat transfer tubes (1A), (1A), ..., The first heat transfer tubes (1A), (1A) ,.
a) A knitted body (2) arranged in a state of straddling each other and mountain portions (1Ab); and a knitted body (2) arranged outside the knitted body (2) in an extended state, Wire mesh (3A), (3A), ... Valley (3A)
a) and mountain part (3Ab) and the second heat transfer tube (1B), (1
B), ··· second contacting and fixed to each
A heat exchanger characterized by having wire meshes (3B), (3B) ,.