JP2001133193A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate type heat exchanger capable of improving the efficiency of heat exchanging by correcting and uniformly distributing flow rate of each heat exchanging element. SOLUTION: In the plate type heat exchanger comprising a heat exchanging element 2 having one set of two plates 4 having openings at both longitudinal ends so that the elements are matched at the openings 7 and superposed and a space between the two plates is formed as a first fluid passage and space between the elements is formed as a second fluid passage, a means for controlling amounts of the fluids supplied to the elements is provided in a channel 8 for passing the first fluid between the openings of the plates. In this case, the means for controlling the amounts of the fluids stepwisely changes the sizes of supply ports 11, 13 of a spacer 10 or an overhanging part 12 provided at the channel 8 between the openings of the two plates and the sizes of supply ports of approach parts for connecting the channel to the elements at the respective elements.

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, and in particular, at least one fluid is low-pressure steam, such as an evaporator, a low-temperature regenerator, or a condenser of a refrigerator using a low-pressure refrigerant. The present invention relates to a plate-type heat exchanger which is suitable for a case or for evaporating by phase change or liquefying from a vapor, in which plates are stacked and two fluids alternately flow between the plates to exchange heat.

[0002]

2. Description of the Related Art A plate heat exchanger has a smaller volume than a heat transfer area. For example, when used as a heat exchanger of a refrigerator, the size of the refrigerator can be greatly reduced. FIG. 3 shows a plate heat exchanger used for a refrigerator using a known low-pressure refrigerant. In FIG. 3A, two plates 4 having openings 7 at both ends are overlapped so as to form a space inside, and the peripheral edge 9 is sealed to form the heat exchange element 2. Heat exchange element 2
Are stacked and connected so that the openings 7 communicate with each other to form a heat exchange structure 3, which is housed inside the shell 1, and the fluids A, B are provided inside and outside 5, 6 of the heat exchange element 2. And heat is exchanged with each other. FIG.
FIG. 2B is an enlarged cross-sectional view of the opening 7.

[0003] Such a heat exchanger can provide an appropriate space between the plates and can also perform heat exchange between gas-liquid two-phase flow and gas-liquid. It has excellent characteristics as a heat exchanger for water heaters. However, especially when a plate heat exchanger is used as the heat exchanger of the refrigerator, the cooling water, cold water, and hot water intake / extraction ports (nozzles) that pass through the interior should be in the same direction because of the self-use. However, if the nozzles of the plate heat exchanger are provided in the same direction, the pressure loss of the supply path will be caused by the thickness of the heat exchange element depending on the position of the heat exchange element. The supply amount may fluctuate (drift). In particular, this tendency is remarkable when the number of stacked plates is increased, and when the drift occurs, the heat transfer performance of the heat exchanger is deteriorated.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and corrects the flow rate of each heat exchange element so that the fluid can flow uniformly and the efficiency of heat exchange can be improved. It is an object to provide a heat exchanger of the type.

[0005]

In order to solve the above-mentioned problems, according to the present invention, heat exchange is performed by forming a pair of plates having irregularities and having openings at both ends in the longitudinal direction and superimposing the peripheral edges. The heat exchange element is formed by stacking a plurality of heat exchange elements together with their openings, forming the heat exchange element.
In a plate heat exchanger in which the space between the plates is a first fluid passage, the space between the heat exchange element and the element is a second fluid passage, and the plate is a heat transfer surface for both fluids, A means for controlling the amount of fluid supplied to each heat exchange element in a flow path through which the first fluid passes between the openings of the pair of plates serving as the heat exchange elements It is. In the plate heat exchanger, the control of the amount of the fluid supplied to each heat exchange element can be set so as to correct the non-uniformity of the supply amount of the fluid caused by the pressure loss of the supply path. The means for controlling the amount of the fluid may include the size of a supply port of a spacer or an overhang provided in the first fluid flow path between the openings of the two plates, or the distance between the openings of the two plates. The size of the supply port of the run-up section connecting the first fluid flow path and the heat exchange section can be changed stepwise for each heat exchange element.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The plate type heat exchanger to which the present invention can be applied is a shell-and-plate type of liquid relative liquid phase or liquid relative gas phase, even if it is a laminated plate heat exchanger of liquid relative liquid phase. It may be a heat exchanger (FIG. 3) or a liquid film type plate heat exchanger of a liquid relative liquid film or a gas relative liquid film. In the present invention, a fluid flow rate adjusting means is provided for each plate to correct uneven supply amount caused by a difference in length of the supply path. The adjusting means may be based on the number or size of the spacers provided between the openings of the plates or the number of the supply ports opened in the overhanging portion, and the plate of the approaching portion connecting the fluid flow path of the opening and the heat exchange portion. And a gap formed by a gap between them (supply port).

Next, the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a fluid flow path portion between openings of a plate of the plate heat exchanger according to the present invention, and FIG. 1 (a) shows a flow path 8 between openings 7 of plates 4 and 4. Is provided with a spacer 10. Generally, in a plate-type exchanger, the fluid supply path is joined by joining the projecting portions of the plates. In FIG. 1A, however, a spacer 10 is provided between the plate openings 7 in order to improve the adhesiveness of brazing. Is inserted. The spacer 10 has a supply port 11 for supplying a fluid to the inside of the plate 4. In the present invention, the size of the supply port 11 is adjusted according to the position of the supply path. Specifically, the supply port is gradually increased as the distance from the supply path entrance increases. It is easy to change the supply port 11 depending on the position of the heat exchange element 2. Further, the number of holes of the supply port may be changed regardless of the size.

FIG. 1B shows openings 7 of the plate 4.
A rising portion (overhanging portion) 12 is provided in the flow path 8 between them. In FIG. 1 (b), the plate opening protrudes into the fluid flow path 8 between the plate openings 7, and the protruding portion 1 is formed.
2 is provided, and the flow rate flowing through the supply port is adjusted by changing the interval 13 between the overhanging portions according to the length of the overhang. The length of the overhang portion 12 can be adjusted relatively easily at the time of trimming at the time of plate forming. FIG. 2 is a cross-sectional view showing another example of the fluid flow path at the plate opening of the plate heat exchanger of the present invention. In FIG. 2, a part 15 having a partially reduced width is provided in a run-in part 14 connecting a fluid flow path 8 between the plate openings 7 and a heat exchange part of the plate. The flow rate is controlled by changing (increasing gradually).

[0009]

According to the present invention, the flow rate in the plate can be corrected for each heat exchange element so that the flow rate can be uniform and the plate heat exchanger can be improved in heat exchange efficiency. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a plate heat exchanger of the present invention in which (a) a spacer is provided in a fluid flow path portion between plate openings.
(B) Sectional view provided with an overhang.

FIG. 2 is a cross-sectional view showing another example of the fluid flow path between the plate openings of the plate heat exchanger of the present invention.

FIG. 3 is a (a) general front sectional view of a known plate heat exchanger, and (b) an enlarged sectional view of a fluid flow path portion.

[Explanation of symbols]

2: heat exchange element, 4: plate, 7: opening, 8: fluid channel, 9: joint, 10: spacer, 11: supply port, 1
2: overhang, 13: spacing, 14: run-in, 15: channel width

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akiyoshi Suzuki 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Works Co., Ltd. (72) Inventor Tomoyoshi Irie 11-1 Haneda Asahimachi, Ota-ku, Tokyo Stock F term in EBARA CORPORATION (reference) 3L103 AA37 BB33 BB42 CC18 CC30 DD09 DD15 DD55

Claims (4)

[Claims] 1. A heat exchange element comprising a pair of plates having irregularities and provided with openings at both ends in the longitudinal direction, and the peripheral edges of the plates are overlapped to form a heat exchange element. The space formed between the two plates forming the heat exchange element is defined as a first fluid passage, and the space between the heat exchange element and the element is defined as a second fluid passage. In a plate heat exchanger that is a heat transfer surface for both fluids,
A means for controlling the amount of fluid supplied to each heat exchange element is provided in the flow path through which the first fluid passes between the openings of the pair of plates serving as the heat exchange elements. The plate type heat exchanger characterized by the above-mentioned. 2. The method according to claim 1, wherein the control of the amount of the fluid supplied to each of the heat exchange elements is set so as to correct the non-uniformity of the supply amount of the fluid caused by the pressure loss of the supply path. 2. The plate heat exchanger according to 1. 3. The method according to claim 1, wherein the means for controlling the amount of the fluid includes a step of, for each heat exchange element, a size of a supply port of a spacer or an overhang provided in the first fluid flow path between the openings of the two plates. 3. The plate-type heat exchanger according to claim 1, wherein the temperature is varied. 4. A means for controlling the amount of fluid, wherein the size of a supply port of a run-up section connecting a first fluid flow path between openings of two plates and a heat exchange section is determined for each heat exchange element. 3. The plate heat exchanger according to claim 1, wherein the temperature is changed stepwise.