JPS63306398A - Heat exchanger - Google Patents

Abstract

PURPOSE:To allow an even influx of refrigerant to effectively use respective refrigerant passages by orienting the opening of a refrigerant inlet pipe toward the circumferential direction of an annular chamber formed by a header. CONSTITUTION:An inlet header 10 forms an annular chamber 22 connected to refrigerant passages 8 at an end of an outer pipe 9 fitted over an inner pipe 6 in which heating medium passes. Since the opening 24 of a refrigerant inlet pipe 23 is oriented toward the circumferential direction of the annular chamber 22, the refrigerant entering from the opening 24 into the header 10 spirals along the inner surface of the header 10 and the outer surface of the inner pipe 6 without colliding the inner pipe 6. Therefore, the refrigerant can evenly enter independent and separate refrigerant passages 8. In this way, by effectively using the refrigerant passages to enhance the refrigerant capacity, the heat exchanger can be miniaturized, and the manufacturing cost of refrigerating device can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a heat exchanger that is used, for example, in a refrigeration system, and performs heat exchange by circulating a heat medium through an inner tube and circulating a refrigerant through an outer tube. It is related to.

[Conventional technology]

FIG. 7 is a refrigerant circuit diagram showing a refrigeration system using a conventional heat exchanger. a condenser 3 of the type, a throttle device 4 that reduces the pressure of the condensed refrigerant, and a heat exchanger 5 that functions as an evaporator to cool the water.
Consists of etc.

A partial sectional view of the heat exchanger 5 is shown in FIG.
As shown in the cross-sectional view taken along the line IX-IX in the figure, an inner tube 6 through which water as a heat medium flows, and a plurality of tubes fitted in the inner tube 6 and disposed radially between the inner tube 6 and the inner tube 6. An inlet header 10 is formed into a coil shape from an outer tube 9 forming a plurality of refrigerant flow passages 8 defined by heat transfer fins 7, etc., and is fixedly connected to both ends of the outer tube 9. A refrigerant inlet pipe 12 and a refrigerant outlet pipe 13 are connected to the outlet header 11 so as to be perpendicular to the header.

Therefore, when the compressor 1 is driven, the high temperature and high pressure gas refrigerant discharged from the compressor 1 circulates in the direction of the arrow, so that water is cooled in the heat exchanger 5.

That is, the gas refrigerant discharged from the compressor 1 is forcedly air-cooled in the condenser 3 and condensed to become a high-temperature, high-pressure liquid refrigerant. This liquid refrigerant is led to the expansion device 4, where it is depressurized to become a low-temperature, low-pressure gas-liquid mixed refrigerant, which flows into the heat exchanger 5 through the refrigerant inlet pipe 12. Then, the refrigerant is distributed into independent refrigerant flow passages 8 and flows through the refrigerant flow passages 8. At this time, heat exchange is performed with a fluid such as water flowing within the inner tube 6. As a result, the refrigerant absorbs heat, vaporizes, and is returned to the compressor 1 through the refrigerant outlet pipe 13.

[Problem that the invention seeks to solve]

However, in a conventional heat exchanger of this type, since the refrigerant inlet pipe 12 is connected to the inlet header 10 so as to be substantially perpendicular to the inlet header 10, the gas-liquid mixed refrigerant flowing from the refrigerant inlet pipe 12 is It immediately collides with the inner pipe 6. Therefore, the flow of refrigerant is disturbed and the amount of refrigerant decreases significantly in the portion of the anti-refrigerant inlet pipe 12 where the inflow of refrigerant is blocked by the inner pipe 6, and on average there is Refrigerant will no longer flow. As a result, there was a problem that the refrigerating capacity was reduced. That is, the heat transfer area is reduced in the refrigerant flow path 8 where there is a shortage of refrigerant, and the refrigerant is not sufficiently vaporized in the heat exchanger as a whole.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a heat exchanger that can prevent the refrigerating capacity from decreasing.

[Means for solving problems]

In the heat exchanger according to the present invention, the opening of the refrigerant inlet pipe connected to the header and allowing the refrigerant to flow into the annular chamber formed by the header is opened toward the circumferential direction of the annular chamber.

[Effect]

In the present invention, the refrigerant flowing out from the opening of the refrigerant inlet pipe flows smoothly in the circumferential direction along the inner peripheral surface of the header and the outer peripheral surface of the inner pipe, so that the refrigerant flows evenly into the refrigerant flow path. become.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial sectional view showing the main parts of a heat exchanger according to the present invention;
Figure 2 is a sectional view taken from ■-■ in Figure 1, and Figure 3 is a cross-sectional view taken from ■-■ in Figure 1.
■ In the line sectional views, the reference numeral 21 in these figures indicates a heat exchanger, and this heat exchanger 21, like the conventional one, has an inner tube 6 through which water as a heat medium flows, and this heat exchanger 21. An outer tube 9 that forms a plurality of refrigerant flow passages 8 defined by a plurality of heat transfer fins 7 fitted into the inner tube 6 and arranged radially between the inner tube 6 and the like. It is formed into a coil shape. Reference numerals 10 and 11 designate an inlet header and an outlet header that are fitted into the inner tube 6 and form an annular chamber 22 at the end of the outer tube 9 that communicates with the refrigerant flow passage 8 . One end of these headers is hermetically fixed to the outer circumferential surface of the inner tube 6, and the other end is hermetically fixed to the outer circumferential surface of the outer tube 9.

13 is a refrigerant outlet pipe connected to the outlet header 11, and these members are no different from conventional ones.

Reference numeral 23 denotes a refrigerant inlet pipe connected to the inlet header 10 and serving as a main part of the present invention, and an opening 24 is opened toward the circumferential direction of the annular chamber 22.

In this embodiment, the refrigerant inlet pipe 23 is connected so that its axis is orthogonal to the axis of the inlet header 10,
It is formed by cutting the refrigerant outflow side end with a plane that extends parallel to the axis of the inlet header IO and is inclined with respect to the axis of the refrigerant inlet pipe 23. The tip end 24a of the opening 24 is connected to the outer circumferential surface of the inner tube 6 so as to be in contact therewith. Note that the refrigerant inlet pipe 23 does not necessarily have to be orthogonal to the inlet header 10, and may be slightly inclined.

The heat exchanger 21 configured in this way is used in a refrigeration system as shown in FIG. Water flowing through the pipe 6 can be cooled.

Since the opening 24 of the refrigerant inlet pipe 23 is opened in the circumferential direction of the annular chamber 22, the refrigerant flowing out from the opening 24 and flowing into the inlet header 10 is transferred to the inlet header 10.
The liquid can flow smoothly in the circumferential direction along the inner circumferential surface of the inner tube 6 and the outer circumferential surface of the inner tube 6.

In other words, the refrigerant flowing into the inlet header 10 can flow while rotating in a spiral shape as shown by the arrow in FIG. 1 without colliding with the inner pipe 6.
The refrigerant can evenly flow into the plurality of independent refrigerant flow passages 8. As a result, each refrigerant flow path 8 can be effectively used to vaporize the refrigerant.

FIG. 4 is a perspective view of a refrigerant inlet pipe 23 showing a second embodiment. In this embodiment, the end of the refrigerant inlet pipe 23 is cut into a step shape having a stepped portion 31, so that an opening 24 is formed. is formed. Even in such an example,
The refrigerant inlet pipe 23 is connected so as to be inserted until the tip 24a contacts the outer peripheral surface of the inner pipe 6, and the refrigerant flowing out from the opening 24 can flow in a spiral shape.

As described above, the present invention aims to allow the refrigerant to flow smoothly by orienting the opening 24 of the refrigerant inlet pipe 23 in the circumferential direction of the annular chamber 22.
As described above, the opening 24 is not limited to a special shape; for example, as shown in the third embodiment shown in FIGS. 5 and 6, the refrigerant inlet pipe 23 of the inlet header 10 The connecting portion 32 to which is connected may be processed to be inclined with respect to the diametrical direction of the header, and the refrigerant inlet pipe 23 may be inclined so that its axis 33 is oriented in the circumferential direction of the annular chamber 22. good. Here, it is preferable that the axis 33 of the refrigerant inlet pipe 23 be substantially equal to the tangent to the outer peripheral surface of the inner pipe 6.

Even in such an embodiment, the refrigerant flowing into the inlet header 10 from the refrigerant inlet pipe 23 smoothly flows spirally through the annular chamber 22 as shown by the arrow in FIG. The liquid then flows into the channel 8. Although the opening 24 is formed by cutting the end of the refrigerant inlet pipe 23 in a direction perpendicular to the axis of the refrigerant inlet pipe 23, it is not always necessary to cut it in this way, and the end can be cut in a direction perpendicular to the axis of the refrigerant inlet pipe 23. It may also be cut by a surface that is inclined with respect to the surface.

In addition, although the above-mentioned example was explained as an example implemented in an air-cooled type refrigeration system, the present invention is not limited to this, and can also be implemented in a water-cooled type or a heat pump type refrigeration system. Similar effects can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the opening of the refrigerant inlet pipe that is connected to the header and allows the refrigerant to flow into the annular chamber formed by the header is opened toward the circumferential direction of the annular chamber. The refrigerant flowing in from the opening can smoothly flow in the circumferential direction along the inner circumferential surface of the header and the outer circumferential surface of the inner tube.

Therefore, the refrigerant is allowed to flow into the refrigerant flow passages evenly, and each refrigerant flow passage can be used effectively, so that it is possible to prevent the refrigerating capacity from decreasing. In other words, it is possible to effectively utilize refrigerant flow paths that were not used effectively in the past, making it possible to increase the refrigerating capacity relatively compared to conventional ones, and the heat exchange rate increases accordingly. It also becomes possible to downsize the device. As a result, if applied to a refrigeration system, it can be expected to downsize the refrigeration system and reduce the manufacturing cost of the refrigeration system.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing the main parts of a heat exchanger according to the present invention, FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG.
4 is a perspective view of the refrigerant inlet pipe showing the second embodiment, FIG. 5 is a partial sectional view of the main part of the heat exchanger showing the third embodiment, and FIG. FIG. 5 is a sectional view taken along line VI-Vl, FIG. 7 is a refrigerant circuit diagram showing a refrigeration system using a conventional heat exchanger, FIG. 8 is a partial sectional view showing a conventional heat exchanger, and FIG. The figure is a sectional view taken along line IX-IX in FIG. 6... Inner pipe, 8... Refrigerant flow path, 9... Outer tube, 10... Inner tube, 21... Heat exchanger, 22... Annular chamber, 23... Refrigerant inlet pipe, 24
····Aperture.

Claims (2)

[Claims] (1) Forming a plurality of refrigerant passages defined by an inner tube through which the heat medium flows and a plurality of heat transfer fins fitted into the inner tube and arranged radially between the inner tube. A heat exchanger comprising: an outer tube; and a header that is fitted into the inner tube and forms an annular chamber at an end of the outer tube that communicates with the refrigerant flow passage; A heat exchanger characterized in that an opening of a refrigerant inlet pipe into which a refrigerant flows is opened toward the circumferential direction of an annular chamber. (2) The heat exchanger according to claim 1, wherein the refrigerant inlet pipe is inclined so that its axis is directed in the circumferential direction of the annular chamber.