JPH11287572A - Brazing plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a brazing plate type heat exchanger by unifying the distribution of refrigerant liquid into refrigerant passages. SOLUTION: In a brazing plate type heat exchanger, used as an evaporator in which refrigerant is made to flow from the lower side to the upper side of the same, a gas-liquid separating chamber 7 for separating gas from liquid in the same is provided on the way of a route from a refrigerant inlet port nozzle 5 into refrigerant inlet nozzle holes 5A to guide the refrigerant liquid into a refrigerant passage R after separating gas from liquid in the gas-liquid separating chamber 7 whereby air bubbles are prevented from entering the refrigerant passage R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing plate type heat exchanger used as a refrigerant evaporator.

[0002]

2. Description of the Related Art As shown in FIGS. 2 to 4, a brazing plate type heat exchanger comprises a plurality of stacked heat transfer plates (1) sandwiched between a pair of end frames (2). It is constructed by permanently joining with materials.
As in the case of a normal plate heat exchanger, alternate fluid passages for high-temperature fluid and low-temperature fluid are formed between the heat transfer plates (1), and an inlet / outlet nozzle for a heat exchange medium is attached to the end frame (2). ing. By way of example, a hot fluid inlet nozzle (3) and an outlet nozzle (4), and a cold fluid inlet nozzle (5) and an outlet nozzle (6).

For example, when used as a refrigerant evaporator, water is supplied to a high-temperature fluid inlet nozzle (3) and a refrigerant is supplied to a low-temperature fluid inlet nozzle (5). The refrigerant evaporates by taking heat from the water flowing in the adjacent high-temperature fluid passage while flowing through the low-temperature fluid passage formed between the heat transfer plates (1), and the generated refrigerant vapor flows from the low-temperature fluid outlet nozzle (6). Taken out. The water deprived of heat by the refrigerant and cooled is discharged as cold water from the high-temperature fluid outlet nozzle (4).

When used as a condenser for refrigerant vapor, refrigerant vapor is supplied to the high-temperature fluid inlet nozzle (3) and cold water is supplied to the low-temperature fluid inlet nozzle (5). The refrigerant vapor condenses by applying heat to the cold water flowing in the adjacent low-temperature fluid passage while flowing through the high-temperature fluid passage, and the refrigerant in the liquid phase is taken out from the high-temperature fluid outlet nozzle (4). The water that has taken heat from the refrigerant and has raised the temperature is discharged from the low-temperature fluid outlet nozzle (6).

[0005]

In a conventional brazing plate type heat exchanger which is used as an evaporator for flowing a refrigerant from below to above, when a refrigerant liquid containing bubbles enters from a refrigerant inlet nozzle, bubbles are formed in an arbitrary refrigerant. The refrigerant tends to flow into the passage and exit from the refrigerant outlet nozzle. Therefore, there is a problem that the dispersion of the refrigerant liquid is not uniform between the refrigerant passages and the performance is reduced.

Accordingly, an object of the present invention is to improve the performance by making the distribution of the refrigerant liquid in the refrigerant passage uniform.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a brazing plate type heat exchanger used as an evaporator for flowing a refrigerant from below to above, in the middle of a path from a refrigerant inlet nozzle to a refrigerant inlet nozzle hole. A room for separating gas and liquid is provided in the chamber, and after the gas and liquid are separated in this room, only the refrigerant liquid is guided to the refrigerant passage, thereby preventing bubbles from entering the refrigerant passage.

[0008] Specifically, the room can be in the form of a gap formed between the end frame on the refrigerant inlet side and the heat transfer plate. Then, while communicating with the refrigerant inlet nozzle, the lower part is communicated with the refrigerant inlet nozzle hole, and the upper part is communicated with the refrigerant outlet nozzle hole.

By disposing the refrigerant inlet nozzle at a position higher than the refrigerant inlet nozzle hole, bubbles separated from the refrigerant liquid in the room can easily rise toward the refrigerant outlet nozzle, and pass through the refrigerant passage through the refrigerant inlet nozzle. This is advantageous because it can be prevented from flowing into the air.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments illustrated in the drawings will be described.

First, the overall configuration will be described taking heat exchange between a refrigerant and water as an example. As described above with reference to FIGS. 2 to 4, the brazing plate heat exchanger is configured such that a plurality of superposed heat transfer plates (1) are sandwiched between two end frames (2). It is constituted by being permanently joined by brazing or the like. The heat transfer plate (1) has openings (3a, 4a, 5) at four corners as shown in FIG.
a, 6a), and although not shown in the drawings, a heat transfer surface having a heat transfer performance enhanced by imparting irregularities of a herringbone shape or other appropriate pattern is provided. The periphery of the adjacent heat transfer plate (1) is joined in a watertight manner, and the coolant passages (R) and the water passages (W) are alternately formed between the opposed heat transfer surfaces. In adjacent heat transfer plates (1) forming a water passage (W) between them, annular gaps are formed at predetermined intervals around the openings (3a, 4a) and around the openings (5a, 6a). Are joined to each other in a watertight manner. In adjacent heat transfer plates (1) forming a refrigerant passage (R) between each other,
Annular clearances at predetermined intervals are formed around the openings (5a, 6a), and the periphery of the openings (3a, 4a) are joined to each other in a watertight manner.

As shown in FIG. 3, the openings (3a, 4a, 5a, 6a) of the heat transfer plate (1) are aligned, respectively.
Water inlet nozzle hole (not shown), water outlet nozzle hole (4
A), refrigerant inlet nozzle hole (5A), refrigerant outlet nozzle hole (
(Not shown). A water inlet nozzle (3), a water outlet nozzle (4), a coolant inlet nozzle (5), and a coolant outlet nozzle (6) are attached to the end frame (2) so as to correspond to these nozzle holes. The water passage (W) communicates with the water inlet nozzle hole at the upper end, and the water outlet nozzle hole (4
A). On the other hand, the refrigerant passage (R) communicates with the refrigerant inlet nozzle hole (5A) at the lower end and communicates with the refrigerant outlet nozzle hole at the upper end. Therefore, water is supplied to the water inlet nozzle (3)
Through the water inlet nozzle hole (3A) from there, disperses into the water passage (W), flows therethrough, and gives heat to the refrigerant flowing in the adjacent refrigerant passage (R) while flowing in the water passage (W). The cooled water flows out of the water outlet nozzle (4) through the water outlet nozzle hole (4A). The refrigerant entering from the refrigerant inlet nozzle (5) flows into the refrigerant passage (R) through the refrigerant inlet nozzle hole (5A), and the vapor generated in the refrigerant passage (R) passes through the refrigerant outlet nozzle hole and passes through the refrigerant outlet nozzle. Outflow to (6).

The flow of the heat exchange medium shown here is one example, and the present invention is not limited to this. For example, in some cases, the refrigerant is supplied from the nozzle (5) and taken out from the nozzle (3), and the water is supplied from the nozzle (6) and taken out from the nozzle (4).

Next, the embodiment shown in FIG. 1 will be described. A gas-liquid separation chamber (7) is formed between an end frame (2) to which a refrigerant inlet nozzle (5) is attached and a heat transfer plate (1). The refrigerant liquid entered from the refrigerant inlet nozzle (5) first enters the gas-liquid separation chamber (7), proceeds from the lower communication hole (8) to the refrigerant inlet nozzle hole (5A), and passes through each refrigerant passage (R). And dispersed into The refrigerant inlet nozzle (5) is installed at a position higher than the refrigerant inlet nozzle hole (5A). Therefore, air bubbles entering the gas-liquid separation chamber (7) from the refrigerant inlet nozzle (5) with the refrigerant liquid. Rises in the gas-liquid separation chamber (7), and only the refrigerant liquid advances to the refrigerant passage (R) through the communication hole (8) and the refrigerant inlet nozzle hole (5A). Since the upper part of the gas-liquid separation chamber (7) communicates with the refrigerant outlet nozzle (6: see FIG. 2), the air bubbles separated from the refrigerant liquid in the gas-liquid separation chamber (7) pass through the refrigerant passage (R). Mixed with the refrigerant vapor coming out from the refrigerant outlet nozzle (6).

In this way, the bubbles contained in the coolant liquid are separated before entering the coolant inlet nozzle hole (5A), so that the bubbles do not enter the coolant passage (R).
Only the refrigerant liquid is uniformly dispersed and flows into the refrigerant passage (R). Therefore, it is also prevented that air bubbles stay on the heat transfer surface constituting the refrigerant passage (R) and hinder heat transfer, a good contact state between the refrigerant liquid and the heat transfer surface is maintained, and the evaporation of the refrigerant is promoted. Is done.

[0016]

As described above, the present invention relates to a brazing plate type heat exchanger used as an evaporator for flowing a refrigerant from the bottom to the top in a path from a refrigerant inlet nozzle to an inlet nozzle hole. A chamber for separating gas and liquid is provided inside the chamber, and after the gas and liquid are separated in this room, only the refrigerant liquid is guided to the refrigerant passage, thereby preventing bubbles from entering the refrigerant passage. Therefore, the air bubbles that have caused the performance degradation can be removed, and the original heat transfer surface can be maximized by the uniform flow of the liquid pressure into each plate of the heat exchanger.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an embodiment.

FIG. 2 is a perspective view of a brazing plate type heat exchanger.

FIG. 3 is a cross-sectional view of the brazing plate heat exchanger of FIG. 2 passing through a refrigerant inlet nozzle and a water outlet nozzle.

FIG. 4 is a front view of a heat transfer plate.

[Explanation of symbols]

 R refrigerant passage W water passage 1 heat transfer plate 2 end frame 3 water inlet nozzle 3a opening 4 water outlet nozzle 4A water outlet nozzle hole 4a opening 5 refrigerant inlet nozzle 5A refrigerant inlet nozzle hole 5a opening 6 refrigerant outlet nozzle 6a opening 7 gas-liquid Separation chamber 8 communication hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Bando 4-2-14-1 Fushimi-cho, Chuo-ku, Osaka-shi, Osaka Inside Hisaka Works Co., Ltd. (72) Inventor Shoji Okumura 4 Fushimi-cho, Chuo-ku, Osaka-shi, Osaka 2-14 Chome Inside Hisaka Manufacturing Co., Ltd.

Claims (3)

[Claims] In a brazing plate heat exchanger used as an evaporator for flowing a refrigerant from below to above, in a path from a refrigerant inlet nozzle to an inlet nozzle hole, a chamber for separating gas and liquid therein. A brazing plate type heat exchanger characterized by comprising: 2. A room is formed by providing a gap between the end frame on the refrigerant inlet side and the heat transfer plate, and communicates with a refrigerant inlet nozzle, and communicates with a refrigerant inlet nozzle hole at a lower portion. The brazing plate type heat exchanger according to claim 1, wherein the upper portion communicates with the refrigerant outlet nozzle hole. 3. The brazing plate heat exchanger according to claim 1, wherein the refrigerant inlet nozzle is installed at a position higher than the refrigerant inlet nozzle hole.