JPH05256524A - Structure for heat-exchanger for compressed air dehumidifying device - Google Patents

Abstract

PURPOSE:To further cool compressed air and to promote gasification of a refrigerant in an accumulator by a method wherein an accumulator of which a compressed air dehumidifying device is composed is installed in a heat-exchanger together with a vaporizer. CONSTITUTION:A vaporizer of a freezing cycle connected in a circulating manner to a compressor, a condenser, an expansion valve, a vaporizer, and an accumulator 12 is installed in the vicinity of the inner periphery of an outer cylinder 10 the two ends of which are closed. The accumulator 12 of a freezing cycle is installed further closer to the central side of the cylinder than a vaporizer 14 in the cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved structure of a heat exchanger for dehumidifying compressed air, and is characterized in that an accumulator for a refrigeration cycle is installed in the heat exchanger. The accumulator is installed to temporarily store the refrigerant that has vaporized through the evaporator and prevent the refrigerant that has partially flowed in the liquid state from flowing directly to the compressor.It generally exchanges heat with the outside air. The refrigerant is vaporized.

[0002]

2. Description of the Related Art As a heat exchanger of a conventional compressed air dehumidifier, as shown in FIG. 9, a compressor 1, a condenser 2, an expansion valve 3,
It is known that the evaporator 4 of the refrigeration cycle, which is circulatory connected to the evaporator 4 and the accumulator 5, is mounted inside the inner cylinder 7 of the heat exchanger formed by the outer cylinder 6 and the inner cylinder 7.
In such a heat exchanger, the air flowing from the air inlet of the heat exchanger is cooled by the precooler and further cooled by the evaporator 4 to dehumidify the moisture in the air by dew condensation.

[0003]

However, in such a conventional compressed air dehumidifier, the compressed air supplied to the dehumidifier cannot be sufficiently dehumidified because the compressed air supplied to the dehumidifier cannot be sufficiently cooled by the evaporator of the refrigeration cycle. .. Further, since the accumulator exchanges heat with the outside air, the refrigerant is not vaporized when the outside air temperature is low, and the refrigerant flows in a liquid state to the compressor, resulting in a large load on the compressor. Therefore, the present invention has been made in view of the drawbacks of the prior art, and an object of the present invention is to provide a structure of a heat exchanger including a refrigeration cycle in which a liquid refrigerant is difficult to be supplied to a compressor and the refrigerant is easily vaporized.

[0004]

That is, according to the present invention, cooling by an evaporator was not sufficient, and the accumulator exchanges heat with the outside air, but the compressed air is much hotter than the outside air. In view of the above, the present object is achieved by the structure of the heat exchanger in which the accumulator is installed in the center of the outer cylinder in which the evaporator of the refrigeration cycle is installed and the evaporator is installed on the outer periphery thereof. The evaporator is configured by spirally winding a refrigerant pipe between the accumulator and the inner circumference of the outer cylinder, or by installing a plurality of baffle ring plates and penetrating the refrigerant pipe through the plates.

[0005]

In the heat exchanger according to the present invention, since the evaporator and accumulator of the refrigeration cycle are installed in the outer cylinder, the air flowing into the heat exchanger is cooled by these evaporator and accumulator, The moisture condenses to form air with low absolute humidity and flows out from the outlet of the heat exchanger. Further, in the accumulator in the heat exchanger, the refrigerant flowing in the liquid state exchanges heat with the hot compressed air to vaporize the refrigerant, and the vaporized refrigerant can be sent to the compressor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a vertical cross-sectional view of an embodiment according to the present invention. An accumulator 12 concentric with the outer cylinder 10 is installed in a cylindrical outer cylinder 10, and an outer circumference of the accumulator 12 is provided. A refrigerant pipe that serves as an evaporator of the refrigeration cycle so that the air flowing around the outer circumference of the accumulator 12 circulates.
14 is spirally wound, and air flows along the refrigerant pipe 14. Incidentally, 16 and 18 are air inlets and outlets of the heat exchanger, and the connection between the accumulator 12 and the refrigerant pipe is such that the downstream side of the refrigerant pipe 14 constituting the evaporator and the bottom of the accumulator 12 are connected, and the accumulator 12 Is connected to a refrigerant pipe connected to the compressor.

Next, FIG. 2 shows a second embodiment of the heat exchanger according to the present invention, in which an inner cylinder 13 concentric with the outer cylinder is installed in a cylindrical outer cylinder 10, and One of the spaces formed by the cylinders 10 and 13 is closed, and a refrigerant pipe 14 serving as an evaporator is spirally wound in the space. An accumulator 12 is installed in the space of the inner cylinder 13 so as to be separated from the inner cylinder by a predetermined space so as to be substantially concentric with the inner cylinder. Reference numeral 16 is an inlet for compressed air connected to the outer cylinder 10, and 18 is an air outlet connected so as to communicate with the space formed by the inner cylinder 13 and the outer cylinder 10. In this example, the air inlet
The high temperature compressed air flowing in from 16 is exchanged with the accumulator 12 for heat cooling.

FIG. 3 shows a third embodiment of the heat exchanger according to the present invention, in which an outer cylinder 10 is provided with a cylindrical accumulator 12 which is installed concentrically with the cylinder. Outer cylinder
A plurality of baffle ring plates 20 that alternately surrounds the space formed by the accumulator 12 and the outer wall of the accumulator 12 and the inner wall of the outer cylinder 10 are installed, and the refrigerant pipe 14 serving as an evaporator penetrates the plate 20. It was made. Incidentally, 16 and 18 are an air inlet and an air outlet connected to both ends of the outer cylinder 10.

FIG. 5 shows a fourth embodiment of the heat exchanger according to the present invention, and the accumulator 12 in the space formed by the outer cylinder 10 and accumulator 12 formed in the third embodiment. A plurality of baffle ring plates 20 that are in contact with the wall surfaces of both
In this embodiment, the space is closed by the plate 20. Therefore, as shown in FIGS. 5 to 7, the space around the through hole of the refrigerant pipe 14 is formed as shown in FIGS. The plate 20 is provided with a plurality of cut-and-raised parts 22 for guiding the air to circulate along the surface of the plate 20. As the cut-and-raised parts 22, two cuts provided substantially parallel to the radial direction of the plate 20 as shown in FIG.

In the first and second embodiments, the outer cylinder 10
And the space formed by the accumulator 12 or the space formed by the outer cylinder 10 and the inner cylinder 13 is spirally wound around the refrigerant pipe 14 serving as an evaporator, but is not limited to this. The refrigerant tubes 14 may be closely attached to each other and wound in a spiral shape in a double-ply state.

In the third and fourth embodiments, the baffle ring plate 20 is arranged in the space between the outer cylinder 10 and the accumulator 20, but the invention is not limited to this. The inner cylinder 13 is placed inside the outer cylinder 10 as in the embodiment.
May be installed, and the baffle ring plate 20 may be installed in the space formed by the inner cylinder 13.

In the heat exchangers according to the respective embodiments having the above-described configurations, the compressed air having a higher temperature (from the outside air) flows into the outer cylinder 10 from the air inlet 16. In the first embodiment, the inflowing air is first heat-exchanged with the evaporator 14 and the accumulator 12 because the refrigerant pipe 14 partitions the space formed by the accumulator 12 and the outer cylinder 11 into a spiral passage. As a result of being cooled, the water contained in the air is condensed to form a drain. The air with dew condensation turns into air with a low absolute humidity and is supplied to a predetermined place from the air outlet 18. The refrigerant in the accumulator 12 exchanges heat with the hot compressed air to vaporize the liquid.

Next, in the second embodiment, the air introduced from the air inlet 16 is precooled by the accumulator 12 and then cooled by the refrigerant pipe 14 of the evaporator. Further, in the third embodiment, since the space formed by the outer cylinder 10 and the accumulator 12 is partitioned by the baffle ring plate 20, the air flow is substantially perpendicular to the refrigerant pipe 14 and the refrigerant flows while forming a meandering flow. The tube 14 and the accumulator 12 are heat-exchanged and cooled.

In the fourth embodiment, the space formed by the accumulator 12 and the outer cylinder 10 is partitioned by a baffle ring plate 20 without any gap, and the heat exchange area by the plate 20 is larger than that in the third embodiment. Is also wide. Also, the plate 20
Since a plurality of cut-and-raised parts are formed in the space, the air is not a meandering flow in the space, and the plate is substantially perpendicular to the refrigerant pipe 14.
It becomes a circular flow parallel to 20.

[0015]

As described above, in the structure of the heat exchanger according to the present invention, the accumulator, which is conventionally installed outside, is installed in the heat exchanger, so that the space of the entire device can be saved. Further, since the compressed air is cooled by the accumulator and the evaporator, the cooling efficiency of the air can be increased. Further, the accumulator that was conventionally installed outside was configured to exchange heat with the outside air, but since it was configured to exchange heat with the compressed air that has a temperature higher than that of the outside air, the gasification of the refrigerant by the accumulator proceeds as well. Since the gasified refrigerant can be supplied to the compressor, the entire device is unlikely to fail.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of an apparatus according to the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the device according to the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the device according to the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the device according to the present invention.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a sectional view taken along line CC of FIG.

FIG. 8 is another embodiment of the CC cross section of FIG.

FIG. 9 is a schematic view of an apparatus showing the prior art.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Expansion valve 4 Evaporator 5 Accumulator 6 Outer cylinder 7 Inner cylinder 10 Outer cylinder 12 Accumulator 13 Inner cylinder 14 Refrigerant pipe 16 Air inlet 18 Air outlet 20 Baffle ring plate

Claims (6)

[Claims] 1. A compressor, a condenser, an expansion valve, an evaporator, and an evaporator that is circulatory connected to an accumulator are installed near the inner circumference of an outer cylinder whose both ends are closed, and an air inlet and an air outlet are provided in the cylinder. The structure of the heat exchanger for a compressed air dehumidifier, wherein an accumulator of a refrigeration cycle is installed closer to the center side of the cylinder than the evaporator. 2. The heat for a compressed air dehumidifier according to claim 1, wherein the accumulator comprises a cylindrical body concentric with the outer cylinder, and an evaporator is installed in a space between the outer cylinder and the accumulator. Exchanger structure. 3. The accumulator is installed inside an inner cylinder concentric with the outer cylinder, and one end of a space between the outer cylinder and the inner cylinder is closed. Structure of heat exchanger for compressed air dehumidifier. 4. A refrigerant pipe, which is an evaporator, is wound in a single or multiple layers so that a space between the outer cylinder and the accumulator or the inner cylinder forms a spiral passage.
The structure of the heat exchanger for a compressed air dehumidifier as described. 5. A plurality of baffle ring plates alternately surrounding the inner wall of the outer cylinder and the outer wall of the accumulator or the inner cylinder are installed in the space between the outer cylinder and the accumulator or the inner cylinder, and the baffle ring plate is provided with an evaporator. The structure of the heat exchanger for a compressed air dehumidifying device according to claim 2 or 3, wherein a certain refrigerant pipe is penetrated. 6. A plurality of baffle ring plates circumferentially contacting the inner wall of the outer cylinder and the cumulator or the outer wall of the inner cylinder are installed in the space between the outer cylinder and the accumulator or the inner cylinder, and the baffle ring plate is an evaporator. 4. The compressed air according to claim 2, wherein the refrigerant pipe is penetrated, and further, a cut-and-raised portion is provided on one surface of the baffle ring plate for guiding the air flow so as to flow perpendicularly to the refrigerant pipe. Structure of heat exchanger for dehumidifier.