EP2278253B1

EP2278253B1 - Spacer, fixing structure and heat exchanger

Info

Publication number: EP2278253B1
Application number: EP10167210.3A
Authority: EP
Inventors: Yoshio Ando
Original assignee: Paloma Co Ltd
Current assignee: Paloma Co Ltd
Priority date: 2009-06-25
Filing date: 2010-06-24
Publication date: 2016-09-14
Anticipated expiration: 2030-06-24
Also published as: EP2278253A3; US20100326639A1; JP4963126B2; AU2010202577B2; EP2278253A2; AU2010202577A1; JP2011007420A

Description

BACKGROUND

The present invention relates to a technique of stacking a plurality of pipe arrays including at least one pipe arranged along a predetermined plane.
For example, in a heat exchanger disclosed in Unexamined Japanese Patent Publication No. 2008-151473 , a plurality of pipe arrays including a plurality of pipes arranged along a predetermined plane are stacked. Intervals between the adjacent two pipe arrays are controlled using a control member made of a wire rod.
Since the above-described control member is a wire rod, the intervals between the pipe arrays can be maintained but intervals between or positions of the respective pipes in the pipe arrays cannot be properly maintained.
FR 1 473 989 A discloses a pipe array formed by a plurality of pipe portions of a pipe wherein the pipe portions are connected by U-formed pieces. These U-formed pieces are regarded as spacers, wherein the U-formed pieces are absorbed in an absorption device.
WO 2007/047603 A1 discloses a pipe support device of a heat exchanger including an array of pipes wherein the pipes are separated from an adjacent pipe through the pipe support device. The pipe support device further comprises a positioning portion which positions the pipes in a plane portion.
DE 10 2008 046 690 A1 discloses a heat-exchanger with a first and a second row of pipes. The first and the second row of pipes form a pipe array. The pipes are prevented from vibrating and moving through a kind of a spacer. In Fig. 8 the spacer comprises bases for clamping the pipes into the designated spaces.
DE 22 51 866 A1 discloses an array of pipes which are stacked in several planes. A spacer separates each plane of pipe of an in horizontal direction adjacent plane of pipe. Each spacer comprises a plurality of a kind of tongues, wherein the tongues are formed downward of a spacer and serve for separating the pipes from an adjacent pipe in a vertical direction according to Fig. 3. In Fig. 2 are two spacers disclosed which place a pipe through two tongues formed in opposite direction.

SUMMARY

It is an object of the invention to provide a spacer being interposed between two pipe arrays stacked on one another, a fixing structure comprising at least one spacer as well as a heat exchanger with which moisture occuring between single pipes due to streaming of ambient air can be carried out of the pipe arrays.
This object can be achieved by the features of claims 1, 4 and 6, respectively.
In one aspect of the present invention, it is preferable that not only the intervals between stacked plurality of pipe arrays but a position of at least one pipe in each of the plurality of pipe arrays can be properly maintained.
A first aspect of the invention provides a spacer comprising a plane portion and at least one positioning portion. The plane portion is interposed between two pipe arrays stacked on one another. Each of the two pipe arrays is formed by arranging at least one pipe along a plane which crosses a stacking direction of the two pipe arrays. The at least one positioning portion positions the at least one pipe in at least one of the two pipe arrays on the plane portion.
In the spacer constituted as such, when the plane portion is arranged between the two pipe arrays, the at least one pipe in the at least one of the two pipe arrays can be positioned on the plane portion. Therefore, not only the intervals between the stacked two pipe arrays but also the position of the at least one pipe in the at least one of the two pipe arrays can be properly maintained.
The at least one positioning portion is formed to protrude from the plane portion in at least one of two spots sandwiching an axis line of the at least one pipe.
In this case, the intervals between the two pipe arrays can be maintained with the spacer interposed between the two pipe arrays. Also, the position of the at least one pipe in the at least one of the two pipe arrays can be properly maintained by the at least one positioning portion protruding from the plane portion of the spacer.
The at least one positioning portion is formed by denting the plane portion from one surface of the plane portion toward the other surface in the at least one spot.
In this case, the at least one positioning portion can be formed by easy processing such as denting the plane portion. The spacer can be easily formed from a mere plate-like member.
In the at least one positioning portion formed by denting the plane portion, a through hole is formed which penetrates the at least one positioning portion.
In this case, fluid such as ambient air and moisture flow through the through hole. Thus, retention of the fluid can be restricted.
In case that such through hole is formed, the plane portion may be arranged between the two pipe arrays such that the at least one positioning portion protrudes in a direction of gravity.
This allows positioning of the at least one pipe which is located below the spacer. Moreover, it becomes easy for moisture inside the at least one positioning portion to be discharged downward from the through hole.
At least part of an end portion of the spacer extending along the plane portion may be bent. This allows improvement in bending strength of the spacer.
There is no specific limitation in which direction to bend the at least part of the end portion of the spacer. For example, the at least part of the end portion of the spacer may be bent in the same direction as or opposite direction to the direction in which the at least one positioning portion protrudes.
A second aspect of the invention provides a fixing structure comprising at least one spacer according to one of the claims 1 to 3 and wherein the fixing structure further comprising a clamping portion being capable of clamping the at least one spacer together with a pipe group. The pipe group includes at least the two pipe arrays.
According to the fixing structure as such, the at least one spacer can maintain the intervals between the two pipe arrays, and also fixes the pipe group while properly maintaining the position of the at least one pipe in the at least one of the two pipe arrays.
In this case, the intervals between the two pipe arrays can be maintained with the spacer interposed between the two pipe arrays. Also, the position of the at least one pipe in the at least one of the two pipe arrays can be properly maintained by the at least one positioning portion protruding from the plane portion of the spacer.
The plane portion may include at least one through hole which penetrates at least one of the plane portion and the at least one positioning portion, in a position off the at least one pipe positioned on the plane portion by the at least one positioning portion.
In this case, the clamping portion may include a pair of clamping members and at least one connecting member. Between the pair of clamping members, the at least one spacer is arranged together with the pipe group. The at least one connecting member interconnects the pair of clamping members through the at least one through hole.
In the fixing structure as such, the spacer is interposed between the two pipe arrays, the pipe group is arranged between the pair of clamping members, and the pair of clamping members are connected to each other by the at least one connecting member through the at least one through hole. Thereby, the pipe group can be fixed.
The spacer in the fixing structure according to the second aspect may be constituted in the same manner as the spacer according to the first aspect.
A third aspect of the invention provides a heat exchanger comprising a pipe group and at least one spacer according to one of the claims 1 to 3. The pipe group is formed by at least two pipe arrays stacked on one another. Each of the at least two pipe arrays is formed by arranging at least one heat-transfer pipe along a plane which crosses a stacking direction of the at least two pipe arrays.
The heat exchanger as such may further comprise a clamping portion that clamps the at least one spacer together with the pipe group.
The plane portion may include at least one through hole which penetrates at least one of the plane portion and the at least one positioning portion, in a position off the at least one heat-transfer pipe positioned on the plane portion by the at least one positioning portion.
In this case, the clamping portion may include a pair of clamping members and at least one connecting member. Between the pair of clamping members, the at least one spacer is arranged together with the pipe group. The at least one connecting member interconnects the pair of clamping members through the at least one through hole.
In the heat exchanger constituted as such, the same operation and effect as the spacer of the first aspect or the fixing structure of the second aspect can be obtained.
The at least one heat-transfer pipe may be shaped so as to surround a predetermined space.
The at least one heat-transfer pipe may be arranged to form a space for air passage around the at least one heat-transfer pipe.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be described hereinafter by way of example with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view of appearance of a heat exchanger according to an embodiment;
FIG. 2 is an exploded perspective view of the heat exchanger;
FIG. 3A is a bottom view of a spacer;
FIG. 3B is a side view of the spacer;
FIG. 4A is a front view of one longitudinal end side of the heat exchanger seen from a direction indicated by an arrow A in FIG. 1, the front view being rotated 90° counterclockwise;
FIG. 4B is a top view of the one longitudinal end side of the heat exchanger seen from a direction indicated by an arrow B in FIG. 1;
FIG. 4C is a side view of the one longitudinal end side of the heat exchanger seen from a direction indicated by an arrow C in FIG. 1; and
FIG. 4D is a bottom view of the one longitudinal end side of the heat exchanger seen from a direction indicated by an arrow D in FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(1) Overall constitution of heat exchanger

Referring to FIG. 1, a heat exchanger 1 includes a plurality of heat-transfer pipes (hereinafter, simply referred to as "pipes") 2. Each of these pipes 2 is shaped so as to surround a predetermined space, and spaced out from each other so that a space for air passage is formed around each of these pipes 2.
More particularly, in the present embodiment, these pipes 2 are arranged in parallel to each other and shaped so as to helically surround a rectangular parallelepiped. With the plurality of pipes 2 arranged and shaped as such, a pipe group constituted from a plurality of pipe arrays stacked in an up and down direction in the figure is formed around the space. The plurality of pipe arrays are constituted from the plurality of pipes 2 arranged along a plurality of planes which cross the stacking direction of the pipe arrays.
As shown in FIG. 2, on both longitudinal end sides of the pipe group, spacers 3 are interposed between the respective adjacent pipe arrays. The spacers 3 maintain intervals between the adjacent pipe arrays and intervals between the pipes 2 in the respective pipe arrays.
As shown in FIGS. 3A and 3B, each of the spacers 3 includes a plane portion 33 and a plurality of positioning portions 31 which protrude from the plane portion 33.
The spacer 3 is a plate-like member shaped into a triangular plane, which includes a bent portion 35 and a convex portion 37. The bent portion 35 is formed by bending a section extending from one side of the member. The convex portion 37 is formed along two sides other than the one side forming the bent portion 35. In the present embodiment, the convex portion 37 protrudes from one surface of the spacer 3 facing upward (hereinafter, referred to as a "first surface") in a state that the spacer 3 is interposed between the pipe arrays, and the bent portion 35 is bent toward the other surface facing downward (hereinafter, referred to as a "second surface").
The positioning portions 31 position the respective pipes 2 located along the second surface of the spacer 3 interposed between the pipe arrays. More particularly, each of the positioning portions 31 protrudes in a direction away from the second surface in one of two spots sandwiching an axis line of each of the pipes 2, thereby to position each of the pipes 2 (see FIGS. 4A to 4D).
Also, these positioning portions 31 respectively protrude in the direction of the pipes 2 by denting at least one of two spots sandwiching the axis line of each of the pipes 2 in the plane portion 33 toward the pipes 2. In the present embodiment, side surfaces of the positioning portions 31 slope so as to reduce cross-sectional area of positioning portions 31 toward the protruding direction. As a result, the positioning portion 31 is in the form of a cone as a whole.
In the present embodiment, the six positioning portions 31 are arranged along an outer edge of a triangle according to the shape of the spacer 3. These positioning portions 31 position each of the pipes 2 in at least one of two spots sandwiching the axis line of each of the pipes 2.
Moreover, in a protruding end of each of the positioning portions 31, a through hole 39 is formed which penetrates in a thickness direction of the spacers 3.
The spacers 3, as shown in FIG. 2, are fixed to the pipe group by a pair of clamping members 4 and 5 and bar-like connecting members 6. The clamping members 4 and 5 clamp the pipe group in a stacking direction of the pipe arrays. The connecting members 6 connect the clamping members 4 and 5.
The clamping members 4 and 5 are respectively made of a plate-like member extending in a certain direction and having through holes 42 and 52. The connecting members 6 reach from the through holes 42 of the one clamping member 4 to the through holes 52 of the other clamping member 5, passing through interspaces between the adjacent pipes 2 in the pipe arrays and the through holes 39 in the spacers 3 sequentially along the stacking direction of the pipe arrays. In this manner, the connecting members 6 connect the pair of clamping members 4 and 5.
In the present embodiment, the connecting members 6 are configured as screw members. The tip ends of the screw members are fitted into the through holes 52 which are formed as screw holes in the other clamping member 5. In this manner, connection between the clamping member 5 and the connecting members 6 is achieved (see FIGS. 4A to 4D). Also in the present embodiment, the two through holes 42 and 52 are formed along a longitudinal direction of the respective clamping members 4 and 5. The connecting members 6 are passed through the respective through holes 42 and 52.

(2) Operation and effect

In the heat exchanger 1 constituted as such, the pipe group can be fixed by interposing the spacers 3 between the pipe arrays of the pipe group, arranging the pair of clamping members 4 and 5 to sandwich the pipe group, and passing the connecting members 6 through the through holes 42 and 52 of the clamping members 4 and 5, the through holes 39 of the spacers 3, and the interspaces of the adjacent pipes 2 in the respective pipe arrays.
Here, each of the spacers 3 can maintain the intervals between the pipe arrays by the convex portions 37 of the respective spacers 3, and position the respective pipes 2 in the respective pipe arrays by the positioning portions 31 which protrude from the plane portion 33. In this manner, the spacers 3 can maintain the intervals between the respective pipes 2.
Also, due to the slope of the side surfaces of the positioning portions 31 which protrude from the plane portion 33, the spacers 3 are slightly moved in a direction crossing the planes of the pipe arrays by tightening upon fixing the pipe group. As a result, the pipes 2 are slightly moved along the planes of the pipe arrays along sloped surfaces of the side surfaces of the positioning portions 31. The pipes 2 can be fixed without backlash.
According to the above constituted spacer 3, the positioning portions 31 can be easily formed by denting the plane portion 33. Thus, the spacer 3 which is able to maintain the respective intervals of the pipes 2 can be easily formed from a mere plate-like member.
In the above constituted spacer 3, a part of the through holes 39 formed in the positioning portions 31 can be used for fixing the spacer 3 and the pipe group.
The through holes 39 which are not used for fixing the spacer 3 and the pipe group can pass fluid such as ambient air and moisture. Therefore, it is advantageous to restrict retention of the fluid.
Moreover, the positioning portions 31 are formed to protrude from the surface side facing upward toward the surface side facing downward when the spacer 3 is interposed between the pipe arrays. Thus, the pipes 2 can be positioned which are located below the spacer 3.
Especially in the above-described embodiment, the through holes 39 are positioned at the lower ends of the positioning portions 31. Therefore, moisture (so-called drain) which is retained inside dents of the positioning portions 31 can be discharged downward through the through holes 39.
Also in the above-described spacer 3, bending strength of the spacer 3 can be improved by bending part of the end portion of the spacer 3 (the bent portion 35 and the convex portion 37).

(3) Variations

In the above, an embodiment of the invention has been described. It goes without saying, however, that the present invention is not limited to the above-described embodiment, and can take various modes within the technical scope of the invention, as defined by the claims.
For example, in the above-described embodiment, the spacer 3 is applied to the pipe group in the heat exchanger 1. As long as the same sort of pipe group is used, the spacer 3 can be applied to a pipe group provided in apparatus other than the heat exchanger 1.
In the above-described embodiment, a fixing structure constituted from the spacers 3, the clamping members 4 and 5 and the connecting members 6 is used for fixation of the pipe group in the heat exchanger 1. As long as the same sort of pipe group is used, the fixing structure may be used for fixation of a pipe group provided in apparatus other than the heat exchanger 1.
In the above-described embodiment, the positioning portion 31 of the spacer 3 is formed by denting the plane portion 33 so as to protrude in the dented direction. The positioning portion 31 only has to protrude from the plane portion 33. For example, the positioning portion 31 may be formed by a member attached to the plane portion 33 or a member formed by cutting and raising the plane portion 33. In this case, the positioning portion 31 is only required to protrude to such an extent that at least part of the positioning portion 31 comes into contact with the pipe 2.
In the above-described embodiment, the positioning portion 31 of the spacer 3 protrudes from the first surface facing upward toward the second surface facing downward. The positioning portion 31 may be formed to protrude from the second surface side toward the first surface side. Alternatively, the positioning portion 31 may be formed to protrude from both the first surface and the second surface.
In the above-described embodiment, the bent portion 35 of the spacer 3 is bent in the same direction as the direction in which the positioning portion 31 protrudes. The bent portion 35 may be bent in the opposite direction to the direction in which the positioning portion 31 protrudes.
In the above-described embodiment, the convex portion 37 of the spacer 3 protrudes in the opposite direction to the direction to which the positioning portion 31 protrudes. The convex portion 37 may protrude in the same direction as the direction to which the positioning portion 31 protrudes.
In the above-described embodiment, the planar shape of the spacer 3 is formed into an almost triangle. The planar shape of the spacer 3 is not limited to a triangle but may be a trapezoid, a rectangle or a circle.
In the above-described embodiment, the pipes 2 are shaped to helically surround a rectangular parallelepiped. The pipes 2 may be shaped so as to reciprocate within a predetermined space.

Claims

A spacer (3) comprising:
a plane portion (33) being capable to be interposed between two pipe arrays stacked on one another, each of the two pipe arrays being formed by arranging at least one pipe (2) along a plane which crosses a stacking direction of the two pipe arrays, and

at least one positioning portion (31) being capable of positioning the at least one pipe (2) in at least one of the two pipe arrays on the plane portion (33), and
wherein the at least one positioning portion (31) is formed to protrude from the plane portion (33) in at least one of two spots being capable of sandwiching an axis line of the at least one pipe (2), and
wherein the at least one positioning portion (31) is formed by denting the plane portion (33) from one surface of the plane portion (33) toward the other surface in the at least one spot, characterized in that
the at least one positioning portion (31) includes a through hole (39) which penetrates the at least one positioning portion (31) and through which fluid flows.
The spacer (3) according to claim 1, wherein the plane portion (33) is capable to be arranged between the two pipe arrays such that the at least one positioning portion (31) protrudes in a direction of gravity.
The spacer (3) according to claim 1 or 2, wherein at least part of an end portion of the spacer (3) extending along the plane portion (33) is bent.
A fixing structure (3, 4, 5, 6) comprising at least one spacer (3) according to one of claims 1 to 3, and wherein the fixing structure (3, 4, 5, 6) further comprising
a clamping portion (4, 5, 6) being capable of clamping the at least one spacer (3) together with a pipe group, the pipe group including at least the two pipe arrays.
The fixing structure (3, 4, 5, 6) according to claim 4, wherein the plane portion (33) includes at least one through hole (39) which penetrates at least one of the plane portion (33) and the at least one positioning portion (31), in a position off the at least one pipe (2) positioned on the plane portion (33) by the at least one positioning portion (31), and
wherein the clamping portion (4, 5, 6) includes:
a pair of clamping members (4, 5), the at least one spacer (3) being capable to be arranged together with the pipe group between the pair of clamping members (4, 5); and

at least one connecting member (6) that interconnects the pair of clamping members (4, 5) through the at least one through hole (39).
A heat exchanger (1) comprising
a pipe group that is formed by at least two pipe arrays stacked on one another, each of the at least two pipe arrays being formed by arranging at least one heat-transfer pipe (2) along a plane which crosses a stacking direction of the at least two pipe arrays; and further comprising
at least one spacer (3) according to one of claims 1 to 3.
The heat exchanger (1) according to claim 6, further comprising a clamping portion (4, 5, 6) that clamps the at least one spacer (3) together with the pipe group.
The heat exchanger (1) according to claim 7, wherein
the plane portion (33) includes at least one through hole (39) which penetrates at least one of the plane portion (33) and the at least one positioning portion (31), in a position off the at least one heat-transfer pipe (2) positioned on the plane portion (33) by the at least one positioning portion (31), and
wherein the clamping portion (4, 5, 6) includes:
a pair of clamping members (4, 5), the at least one spacer (3) being arranged together with the pipe group between the pair of clamping members (4, 5); and

at least one connecting member (6) that interconnects the pair of clamping members (4, 5) through the at least one through hole (39).
The heat exchanger (1) according to one of claims 6 to 8, wherein the at least one heat-transfer pipe (2) is shaped so as to surround a predetermined space.
The heat exchanger (1) according to one of claims 6 to 9, wherein the at least one heat-transfer pipe (2) is arranged to form a space for air passage around the at least one heat-transfer pipe (2).