JP2000180084A - Heat exchanger for air conditioning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost and distribution cost of heat exchanger. SOLUTION: A rod 11 is inserted into a heat transfer tube 6 and a spacer 12 is provided between the outer circumferential surface 11a of the rod 11 and the wall 6a of the heat transfer tube 6. The spacer 12 is constituted of a hub 14 fitted over the rod 11 and three protrusions 15 projecting radially outward from the hub 14 thus forming a channel 13 of heat exchanging solution between outer circumferential surface 11a of the rod 11 and the wall 6a of the heat transfer tube 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchanger for air conditioning.

[0002]

2. Description of the Related Art In this type of heat exchanger for air conditioning, in order to ensure both heat transfer performance and prevention of erosion of a heat transfer tube, an appropriate flow rate of a heat exchange medium liquid flowing through the heat transfer tube is required. It must be set to a value (for example, a value in the range of 0.5 m / s to 2.0 m / s).

In air-conditioning applications in which a large number of heat exchangers are installed in buildings and the like, it has been strongly desired to reduce the running cost by reducing the flow rate of the heat exchange medium supplied to the heat exchangers. I have. In order to satisfy the demand, conventionally, the above-mentioned flow rate in the pipe is not reduced below an appropriate value, for example, a double-flow heat exchanger is changed to a single-flow heat exchanger, or a single-flow heat exchanger is used. Had to be changed to a half-flow heat exchanger.

[0004]

In the above prior art,
There has been a problem that the flow pattern of the heat exchanger increases and the production cost and distribution cost increase. An object of the present invention is to provide a heat exchanger that can solve the above problem.

[0005]

In order to achieve the above object, according to the invention of claim 1, for example, as shown in FIG. 1, an elongated member 11 is inserted into a heat transfer tube 6 and the elongated member is inserted. The flow path 13 for the heat exchange medium is formed between the outer peripheral surface 11a of the heat transfer tube 11 and the tube wall 6a of the heat transfer tube 6.

According to the first aspect of the present invention, since the cross-sectional area of the flow path is narrowed by the long member inserted into the heat transfer tube, the inside of the tube is sufficiently large even if the supply amount of the heat exchange medium is reduced. The flow velocity can be secured. Since the cross-sectional area of the flow passage can be changed by changing the outer diameter of the long member, it is not necessary to change the flow pattern of the heat exchanger unlike the conventional case. For this reason, the production cost and distribution cost of the heat exchanger can be reduced. It is not necessary to increase the number of rows of the heat transfer tubes by changing the flow pattern of the heat exchanger, so that the fins of the heat transfer tubes can be easily cleaned.

According to the present invention, a spacer 12 is interposed between the outer peripheral surface of the long member 11 and the tube wall 6a of the heat transfer tube 6, so that the spacer 12 is formed. A hub 14 externally fitted to the long member 11,
It is preferable that the plurality of protrusions 15 be formed so as to protrude outward from the hub 14 in the radial direction and be arranged at predetermined intervals in the circumferential direction.

According to the configuration of the second aspect, the heat exchange medium liquid is stirred by the plurality of projections while flowing through the flow path, so that the heat exchange efficiency of the heat exchanger is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a heat exchanger for air conditioning will be described below with reference to FIGS. In this embodiment, an example using cold water as the heat exchange medium liquid of the heat exchanger is described. First, an outline of the structure of the heat exchanger will be described with reference to FIGS. FIG. 2A is an elevational view of the above heat exchanger, and FIG. 2B is a left side view of the same heat exchanger. FIG. 3 is a schematic view corresponding to the line III-III in FIG. 2A and a plan view of the heat transfer tube.

An inlet header 2 and an outlet header 3 are arranged on the left outside of the frame 1, and an inlet flange 4 is fixed to a lower portion of the inlet header 2 and an outlet flange 5 is fixed to an upper portion of the outlet header 3. Have been. The inlet header 2 and the outlet header 3 are connected by a plurality of stages of heat transfer tubes 6. Heat transfer tubes 6 in each of the above stages
Is formed in a coil shape by a copper tube, and here, 10
Set in the column. Note that reference numeral 7 in the drawing indicates a fin. The broken arrows in the figure indicate the flow of air for air conditioning.

Next, a specific structure of the heat transfer tube 6 will be described with reference to FIG. FIG. 1A is an enlarged sectional view of an arrow Ia portion in FIG. 2A, in which the fins 7 are omitted. FIG. 1 (b) is a graph showing Ib in FIG. 1 (a).
FIG. 4 is a cross-sectional view taken along line -Ib.

A round bar made of synthetic resin is provided in the heat transfer tube 6.
(Long member) 11 is inserted, and a plurality of spacers 12 are interposed between the outer peripheral surface 11a of the round bar 11 and the tube wall 6a of the heat transfer tube 6 at a predetermined interval in the longitudinal direction. You. Thereby, the flow path 13 of the cooling water is formed between the outer peripheral surface 11 a of the round bar 11 and the tube wall 6 a of the heat transfer tube 6.

More specifically, the spacer 12 is
The hub 14 is made of a synthetic resin, and includes a hub 14 externally fitted to the round bar 11 and three protrusions 15 protruding radially outward from the hub 14. The three projections 15 are arranged at predetermined intervals in the circumferential direction, and the flow path 13 is communicated between the adjacent projections 15.

Here, each of the spacers 12 is prevented from moving in the axial direction by a pair of retaining rings 17 fitted on the round bar 11. In addition, the above round bar 1
1 is received by a stopper (not shown) fixed to the heat transfer tube 6 to prevent the round bar 11 from moving downstream.
The bend portion can be used as the stopper. In order to prevent the round bar 11 from vibrating during transportation of the heat exchanger or the like, it is preferable that the stoppers face both ends of the round bar 11.

The above embodiment has the following advantages. The flow path 13 is formed by the round bar 11 inserted into the heat transfer tube 6.
Therefore, a sufficiently large flow velocity in the pipe can be ensured even if the supply amount of the cold water as the heat exchange medium is reduced. Therefore, the heat exchange efficiency of the heat exchanger can be kept in a good state. Further, the cold water supplied into the heat transfer tube 6 is stirred by the plurality of protrusions 15 while flowing through the flow path 13, so that the heat exchange efficiency of the heat exchanger is improved.

The protrusions 15 of the spacer 12
Is formed in a propeller shape, the cold water can be guided spirally and sufficiently stirred, so that the heat exchange efficiency is increased. Further, when the propeller-shaped spacer 12 is rotatably supported on the round bar 11, it is possible to rotate the spacer 12 by the flow of the cold water to vigorously agitate the cold water. Therefore, the heat exchange efficiency is further increased.

The above embodiment can be modified as follows. The heat exchange medium liquid flowing through the heat transfer tube 6 may be hot water instead of the cold water illustrated. Moreover,
The heat exchange medium liquid may be another type of refrigerant liquid or heat medium liquid instead of water.

The spacer 12 may be supported on the round bar 11 by caulking or the like. The spacer 1
2 may be fixed to the round bar 11 by welding or an adhesive, or the spacer 12 may be integrally formed with the round bar 11.

The above-mentioned round bar 11, which is a long member, may be made of a corrosion-resistant metal or the like, instead of the exemplified synthetic resin. In addition, the above long member is replaced with an elliptical bar instead of a round bar.
Square rods and pipes can be used. The long member such as the round bar does not need to be inserted over the entire length of each row of the heat transfer tubes 6. For example, the long member is inserted only at the entrance or the exit of each row of the heat transfer tubes 6. There may be.

The long member such as the above-mentioned round bar may be inserted into the tube wall 6a of the heat transfer tube 6 so as to form the flow path 13, and the spacer 12 may be omitted. It is possible.

[Brief description of the drawings]

FIG. 1A is an enlarged sectional view of an arrow Ia portion in FIG. 2A. FIG. 1 (b) is a graph showing Ib− in FIG. 1 (a).
FIG. 3 is a cross-sectional view taken along line Ib.

FIG. 2 (a) is an elevation view of a heat exchanger. FIG.
(b) is a left side view of the heat exchanger.

FIG. 3 is a schematic diagram corresponding to the line III-III in FIG. 2A, and is a plan view of a heat transfer tube.

[Explanation of symbols]

6: heat transfer tube, 6a: tube wall, 11: long member (round bar), 11
a: outer peripheral surface, 12: spacer, 13: flow path, 14: hub, 15: projection.

Claims (2)

[Claims] An elongated member (11) is inserted into a heat transfer tube (6), and an outer peripheral surface (11a) of the elongated member (11) and a tube wall (6a) of the heat transfer tube (6). Between the heat exchange medium and the liquid
(13) An air-conditioning heat exchanger, characterized in that: 2. The heat exchanger for air conditioning according to claim 1, wherein a spacer (3) is provided between an outer peripheral surface of the elongated member (11) and a tube wall (6a) of the heat transfer tube (6). 12) with the spacer (12) externally fitted to the elongated member (11)
(14) and a plurality of projections (15) projecting radially outward from the hub (14) and arranged at predetermined intervals in the circumferential direction, for air conditioning, Heat exchanger.