JP2002303499A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type heat exchanger, conducting refrigerant to flow evenly into respective heat exchanging passages in the laminating direction of plates and not requiring any design for each instruments while capable of coping with the load fluctuation of a refrigerating machine. SOLUTION: In the plate type heat exchanger wherein the heat exchanging passages 4, 5, in which two kinds of fluid, one of which is a gas and liquid two-phase flow refrigerant, are conducted to flow through them, are formed alternately between laminated multiple plates 3 to effect heat exchange while the refrigerant is conducted to flow into a heat exchanging passage 4 for refrigerant from an inlet port passage 10 formed of an inlet port 8 formed on the plates 3, the inlet port passage 10 is divided into a plurality of sections in the laminating direction of the plates 3 to conduct and distribute the refrigerant to flow into each several sheets of the plate 3, which will not be affected by the distributing problem of fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger used as an evaporator mounted on a refrigerator.

[0002]

2. Description of the Related Art A plate-type heat exchanger is used as an evaporator mounted on a refrigerator due to its features of compactness and low cost. As shown in FIG. 5, this type of plate heat exchanger has a large number of heat transfer plates 3 arranged in a stacked state between a pair of frames 1 and 2,
Heat exchange passages 4 and 5 for different kinds of fluids are formed alternately.
The one frame 1 is provided with an inlet nozzle 6 and an outlet nozzle 7 for two kinds of fluids, respectively (only one inlet nozzle and one outlet nozzle for one kind of fluid are shown in FIG. 5). The plate 3 has an inlet hole 8 for separating and supplying two kinds of fluids to the heat exchange passages 4 and 5, and an outlet for separating and extracting the fluid which has exchanged heat in the heat exchange passages 4 and 5. Holes 9 are provided at each of the four corners (only an inlet hole for supplying a fluid to the heat exchange passage 4 and an outlet hole for removing the fluid that has undergone heat exchange in the heat exchange passage 4 are shown in FIG. 5). There). Each of the stacked plates 3 has an inlet passage 10 penetrating the plate 3 by the respective inlet hole 8 (only one kind of fluid inlet passage is shown in FIG. 5). . The inlet passage 10 communicates with the inlet side (lower side in FIG. 5) of each heat exchange passage 4 and communicates with the inlet nozzle 6. Further, in each of the stacked plates 3, an outlet passage 11 penetrating each plate 3 is formed by each outlet hole 9 (only one kind of fluid outlet passage is shown in FIG. 5). There). Exit passage 11
Communicates with the outlet side (the upper side in FIG. 5) of each heat exchange passage 4,
And it is in communication with the outlet nozzle 7.

In the plate heat exchanger, one kind of fluid flowing from the inlet nozzle 6 flows through the inlet passage 10 and enters each heat exchange passage 4, and flows through each heat exchange passage 4 to exit the outlet passage. The liquid is discharged from the outlet nozzle 7 to the outside via the line 11. Another type of fluid circulated from an inlet nozzle (not shown) flows through an inlet passage (not shown), enters each heat exchange passage 5, flows through each heat exchange passage 5, and passes through an outlet passage (not shown). Not exit from the outlet nozzle. While the two kinds of fluids flow through the adjacent heat exchange passages 4 and 5, heat exchange is performed between the two kinds of fluids via the plate 3.

When the plate type heat exchanger is used as an evaporator mounted on a refrigerator, the two types of liquids are a refrigerant on the cooling side (CFC or ammonia) and a liquid on the cooled side (water or brine). . Since the refrigerant flows from the inlet nozzle 6 in a gas-liquid two-phase flow state, the gas and the liquid are separated in the inlet passage 10 and the fluid distribution is uneven in the laminating direction of the plate 3 and uniform evaporation is performed. , And the heat exchangeability tends to decrease. This phenomenon becomes more conspicuous as the number of stacked plates 3 increases. Usually, when the number of plates 3 is 50 or more, a decrease in performance cannot be ignored.

Conventionally, in order to solve such inconvenience,
As shown in FIG. 6, a shower pipe 12 having a large number of outlet holes 12 a is inserted from the inlet nozzle 6 into the inlet passage 10, and the refrigerant flows into each heat exchange passage 4 in the stacking direction of the plate 3 by the shower pipe 12. Inflow. In this case, when the refrigerant flows into the narrow shower pipe 12, the flow of the refrigerant is restricted and the refrigerant is diffused by the refrigerant.
Can be distributed and flowed evenly into

[0006]

However, in the case of the shower pipe 12, the size and pitch of the outflow holes 12a must be changed in the stacking direction of the plates 3 according to the number of stacked plates 3. It is necessary to design for use conditions. Further, since the shower pipe 12 regulates the flow of the refrigerant, there is also a problem that it cannot follow the load fluctuation of the refrigerator.

Therefore, the present invention provides a plate-type heat exchange system that allows a refrigerant to flow uniformly into each heat exchange passage in the stacking direction of plates, does not require a design for each device, and can cope with load fluctuations of a refrigerator. The purpose is to provide a vessel.

[0008]

In order to achieve the above-mentioned object, the present invention provides a heat exchange system in which two kinds of fluids, one of which is a gas-liquid two-phase refrigerant, flow between a number of stacked plates. The heat exchange passages to be performed are alternately formed, and in the plate heat exchanger in which the refrigerant flows into the refrigerant heat exchange passage from the inlet passage formed by the inlet hole formed in the plate, the inlet passage is arranged in the stacking direction of the plates. It is divided into a plurality.

Further, in the present invention, a passage dividing component for dividing the entrance passage into a plurality in the stacking direction of the plates is inserted into the entrance passage. As the passage dividing part, a plurality of partition plate members having different lengths are attached to the annular member in parallel and at predetermined intervals, and the outer wall is left outside so as to cover the lower periphery of each partition plate member. A pipe with a body attached, or a plurality of pipes having different lengths integrally attached to a plate-like member and a pipe provided with an outflow hole is inserted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. This embodiment is applied to the plate heat exchanger of FIG. 5, and the same parts as those of FIG. 5 are denoted by the same reference numerals and description thereof will be omitted.

FIG. 1 is a schematic diagram showing a main part of an embodiment of the present invention, in which a passage dividing part 13 is inserted from an inlet nozzle 6 into an inlet passage 10, and the inlet passage 10 is moved in the stacking direction of the plate 3. It is divided into a plurality (three in this embodiment) of divided passages 10a, 10b, 10c.
In this case, the inlet passage 10 is divided in the stacking direction of the plates 3 by the number of plates not affected by the fluid distribution problem. For example, in a plate heat exchanger in which the number of plates 3 is 150, it is preferable to divide the inlet passage 10 into three pieces of 50 pieces each.

[0012] As shown in FIG.
A plurality of (two in this embodiment) partition plate members 13b and 13c having different lengths are attached to the annular member 13a in parallel and integrally at appropriate intervals, and the partition plate members 13b and 13c are integrally mounted. Outer shell 13 which can be inserted into entrance passage 10 having a peripheral wall left so as to cover the lower periphery
d is integrally attached. This passage dividing part 1
3 is inserted from the inlet nozzle 6 into the inlet passage 10, the area of the partition plate member 13a becomes the first section passage 10a, and the area between the tip of the partition member 13b and the tip of the partition member 13c becomes the second section. The area ahead of the end of the partition passage 10b and the partition plate member 13c is defined as a third partition passage 10c.
Are divided in the laminating direction of the plate 3. It should be noted that end plates 13b ', 13b'
13c 'is provided integrally with the end plate 13c.
The end portions of the first section passage 10a and the second section passage 10b are closed by b 'and 13c'.

In this embodiment, when a gas-liquid two-phase flow refrigerant flows into the inlet nozzle 6, this refrigerant
0a, 10b, and 10c are dispersed and flow into each heat exchange passage 4 in the stacking direction of the plate 3. That is, the refrigerant is dispersed and flows from each of the divided passages 10a, 10b, and 10c into each of the heat exchange passages 4 in the respective regions (regions of the number of plates not affected by the fluid distribution problem). By dispersing and flowing the refrigerant from each of the divided passages 10a, 10b, and 10c to each of the heat exchange passages 4 in the respective regions,
The refrigerant can be evenly distributed to the heat exchange passages 4 in the stacking direction of the plates 3, and uniform evaporation can be performed in the heat exchange passages 4 to obtain a predetermined cooling capacity.

According to this embodiment, the number of plates not affected by the fluid distribution problem is changed by the number of plates of the refrigerant inlet passage 10.
Is divided into a plurality in the stacking direction of the plate 3,
The division of the inlet passage 10 may be performed according to the number of stacked plates 3, and there is no need to design each refrigerator. Further, since the flow of the refrigerant is not regulated as in the conventional shower pipe, it is possible to cope with a load fluctuation of the refrigerator.

FIG. 3 is a schematic view showing a main part of another embodiment of the present invention, in which another passage dividing part 15 is inserted from the inlet nozzle 6 into the inlet passage 10 and the inlet passage 10 is connected to the plate 3. In the stacking direction (3 in this embodiment).
) Are divided into divided passages 10a, 10b, and 10c. As shown in FIG. 4, the passage dividing part 15 is formed by integrally attaching a plurality of (three in this embodiment) pipes 15b, 15c, and 15d having different lengths to a disk-shaped member 15a. The first pipe 15b serving as the first section passage 10a has a large number of outlet holes 15 for allowing the refrigerant to flow out.
b 'is open. A large number of outflow holes 15c 'for allowing the refrigerant to flow out are opened in a portion of the second pipe 15c, which becomes the second section passage 10b, ahead of the end of the first pipe 15b. Third pipe 1 serving as third section passage 10c
A large number of outflow holes 15d 'for allowing the refrigerant to flow out are opened at a portion of the 5d that is ahead of the tip of the second pipe 15c.

In this embodiment, when a gas-liquid two-phase flow refrigerant flows into the inlet nozzle 6, the refrigerant is dispersed and flows into the pipes 15b, 15c, 15d of the passage dividing part 15, and flows through the pipes 15b, 15c, 15d. 15d each outflow hole 15
From b ', 15c', and 15d ', the heat flows into each heat exchange passage 4 in the stacking direction of the plate 3. That is, each section passage 10
The refrigerant is dispersed and flows from each of the heat exchange passages 4a, 10b, and 10c into the respective heat exchange passages 4 in the respective regions (regions of the number of plates not affected by the fluid distribution problem).

[0017]

As described above, according to the present invention,
The refrigerant inlet passage is divided into a plurality of plates in the stacking direction of the plates, and the coolant is dispersed and flows into each of the number of plates not affected by the fluid distribution problem. It can flow in evenly and can effectively use all the plates for heat exchange, and there is no need to design each device.
Moreover, it is possible to cope with load fluctuations of the refrigerator.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part showing an embodiment of the present invention.

FIG. 2 is a perspective view of a passage dividing part shown in FIG.

FIG. 3 is a schematic view of a main part showing another embodiment of the present invention.

FIG. 4 is a view showing a passage dividing part shown in FIG. 3;
Is a front view, and (b) is a longitudinal sectional view.

FIG. 5 is a schematic configuration diagram of a plate heat exchanger.

FIG. 6 is a schematic view of a main part of a conventional plate-type heat exchanger using means for uniformly distributing and flowing refrigerant.

[Explanation of symbols]

 Reference Signs List 3 Plate 4 Heat exchange passage (for refrigerant) 5 Heat exchange passage 6 Inlet nozzle 10 Inlet passage 10a, 10b, 10c Separation passage 13 Passage divided part 13a Annular member 13b, 13c Partition plate member 13d Outer body 15 Passage divided part 15a Circle Plate member 15b, 15c, 15d Pipe 15b ', 15c', 15d 'Outflow hole

Claims (4)

[Claims] 1. A heat exchange passage through which two types of fluids, one of which is a gas-liquid two-phase flow refrigerant, flows and heat exchanges are alternately formed between a number of stacked plates, and formed on the plates. A plate heat exchanger for allowing a refrigerant to flow into a refrigerant heat exchange passage from an inlet passage formed by an inlet hole, wherein the inlet passage is divided into a plurality in the stacking direction of the plates. 2. The plate heat exchanger according to claim 1, wherein a passage dividing part for dividing the entrance passage into a plurality in the stacking direction of the plates is inserted into the entrance passage. 3. A plurality of partition plate members having different lengths are attached to the annular member in parallel and at predetermined intervals as the passage dividing parts, and cover the lower periphery of each partition plate member. 3. The plate heat exchanger according to claim 2, wherein a plate to which an outer shell having a peripheral wall left is attached. 4. The passage dividing part according to claim 3, wherein a plurality of pipes having different lengths are integrally attached to the plate-like member, and each pipe is provided with an outflow hole. Plate heat exchanger.