JP2602788Y2 - Stacked evaporator elements - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated evaporator element which is incorporated in, for example, a cooling system of an automobile to vaporize a liquefied refrigerant inside and cool air flowing along an outer surface.

[0002]

2. Description of the Related Art A laminated evaporator is a tube of two metal plates made of aluminum alloy or the like in which an edge and an intermediate ridge are raised from a flat plate portion to form a semi-tubular portion serving as a refrigerant inlet / outlet. Laminate the sheet in the middle, braze the edge, middle ridge, semi-tubular part to make a flat element, combine multiple elements side by side with fins, connect to the tank, and into the element through the tank The inflowing liquefied refrigerant is vaporized in the element to lower the temperature of the element and cool the air flowing along the outer surface of the element.

FIGS. 5 to 8 show a conventional example of a laminated evaporator. FIG. 5 is a front view, FIG. 6 is a bottom view, FIG. 7 is a cross-sectional view taken along line AA of FIG. 5, and FIG. 8 is a perspective view of a tube sheet for forming an element.

In the evaporator 1, a plurality of elements 2 and 2 are arranged with a fin 3 interposed therebetween, and refrigerant ports 4 and 5 of the elements are connected to a tank 6 and
Connected to 7 and brazed as a whole.

As shown in FIGS. 7 and 8, a tube sheet 8 which is superposed in the middle and constitutes the element 2 is formed by pressing a rectangular flat plate made of a metal such as an aluminum alloy.
Then, the semi- tubular portions 4a and 5a that become the refrigerant ports 4 and 5 through which the edge 8b and the intermediate ridge 8c are raised to form the refrigerant inlet / outlet are formed. The end of each raised section is folded over to increase the brazing surface. The flat plate portion 8a has a round bead 8d or an inclined bead 8e for disturbing the flow of the refrigerant, and an elliptical bead 8f.
Is formed.

[0006] When two of the tube sheets 8 are superimposed in the middle and the end faces of the raised portions are brazed, the tanks 6 and 7 are connected to the coolant ports 4 and 5 formed by brazing.
A U-shaped refrigerant passage 2a communicating the tanks 6, 7 as shown in FIG. An inlet pipe 9 and an outlet pipe 10 for the refrigerant are connected to one of the tanks 7, and a partition plate 1 is provided between the two pipes 9 and 10.
It is divided by 1. Therefore, the water flows from the inlet pipe 9 to the tank 7.
Refrigerant inlet Toe gas-liquid two-phase, in the left half of FIG. 5, this
Flow path 2a of the refrigerant inlet to the linked element in the group of the portion 4 or et input is, by the intermediate ridges 8c in elements formed in a U-shape
Through each refrigerant port 5 and into the left half of the other tank 6,
Then move to the right half of this tank 6 and connect to this right half
Through the respective coolant ports 5 into the group of elements,
The right half of the tank 7 from each refrigerant port 4 after passing through the U-shaped flow path 2a
Part and is discharged from the outlet pipe 10. As described above, the liquefied refrigerant evaporates and decreases in temperature while flowing through the multiple elements 2, and cools the air flowing while contacting the outer surface of each element 2 and the fins 3.

As shown in FIG. 9, the tube sheet 8 constituting the element 2 has a tank portion 12 perforated in the sheet.
13 is formed by elongating the element 13 so that adjacent tank portions are brought into contact with each other when the elements are arranged in parallel to act as a tank. In this configuration, the operation of the partition plate 11 shown in FIGS. 5 and 6 can be performed unless one tank is perforated.

[0008]

As described above, when a U-shaped refrigerant flow path is formed in the element 2 to flow the refrigerant, a portion where the refrigerant does not move as indicated by hatching in FIG. 14 to 17). When such a stagnant portion occurs, the effective heat exchange area of the element 2 decreases, and the heat exchange efficiency of the evaporator decreases. This invention is intended to obtain a device which does not cause滯溜of such refrigerant.

[0009]

Means for Solving the Problems The present inventor has to produce Todokotamari portion of the refrigerant as described above, liable to move refrigerant flowing through the wide U-shaped flow path 2a is laterally flow path It was considered that the main flow having a large flow velocity moved laterally at the corner where the bend was generated, and a stagnant portion was formed at a portion where the flow velocity was small outside the main flow. Based on this idea, the present invention divides the coolant flow path 2a in the U-shaped element into a plurality of narrow small flow paths by a plurality of auxiliary ridges, and accordingly, a long flow path . The cross-sectional area of the outer small flow path is made larger than the cross-sectional area of the inner small flow path having a short flow path, and the passage resistance of each small flow path is adjusted.

[0010]

[Action] U-shaped flow path 2a in the device, since it was divided into narrow plurality of small passages width, in this small flow path, the refrigerant flow proceeds is pushed to a subsequent refrigerant, lateral movement It flows almost uniformly not. Therefore, there is no accumulation part . Also, by changing the cross-sectional area of the small flow path, more refrigerant flows through the outer small flow path.
Having adjusted the resistance of each small flow path to the heat exchange state of the refrigerant passing through each small flow path can and almost equally to Turkey.

[0011]

1 to 4 show an embodiment of the present invention. FIG. 1 is an inner view of a tube sheet, FIG. 2 is a side view seen from the right side of FIG. 1, and FIGS. It is an inside view which shows another example. The same parts as those in the above-described conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 1 and FIG. 2, a tube sheet 8 made of a square metal plate includes a flat plate portion 8a to an edge portion 8b, an intermediate ridge 8
half-pipe portion 4a is raised to c formed, and a coolant outlet,
Forming 5a is the same as in the prior art.

[0013] In this embodiment, to uplift the five auxiliary ridges 18-2 2 to U-shaped flow path 2a to form and the edge 8b and the intermediate ridge 8c similar to the central middle ridge 8c U
It is shaped like a letter. These auxiliary ridges form a square.
Parallel to the three sides of the edge 8b, facing the semi-tubular portions 4a, 5a
It has a U-shape that is open and has a bent corner
Like the edge 8b, it is rounded. Since these auxiliary ridges 18 to 22 is formed symmetrically, when attached earthenware pots Iro overlaid on combined during the two tubesheets 8, KakuTakashijo 18-2 2 edges 8b, central ridge 8c, brazing is performed to form auxiliary partition walls, and narrow U-shaped small flow paths 24 to 29 and refrigerant ports 4 and 5 are formed between the partition walls.

The refrigerant that has flowed into the element from one of the refrigerant ports 4 formed by the two tube sheets 8 superposed in the middle is distributed to the small flow paths 24 to 29 and flows out of the refrigerant port 5. . The small channels 24 to 29 are narrow in width and at the corners
Because they rounded, the refrigerant flow is smoothly bent
Since the flow and the flow of the refrigerant do not move laterally greatly,
It does not cause Todokotamari portion at flex portions of small channels.

[0015] Further, the small channels 24 to 29 are cross-sectional area the same
, The closer to the middle ridge 8c, the shorter the length ,
Time heat exchange with the air flowing through the outer surface of the element becomes shorter, Ji raw temperature difference between the outer peripheral side refrigerant over time through the small flow path 18, 19 and heat exchange, the evaporator of the heat The exchange efficiency becomes worse.

[0016] In order to improve the heat exchange efficiency, in this invention, the outer peripheral side small passages time in contact with the flat portion 8a is long cross
The area on the inner peripheral side is large and the contact time with the flat plate portion 8a is short.
The cross-sectional area of the small channel is reduced. Each small channel has a flat part
The cross-sectional area, and hence the passage, because the length in the perpendicular direction is constant
The magnitude of the resistance is determined by the magnitude of the width parallel to the flat portion.
Passage resistance adjustment of the flow path can also be done by punching a bead into a small flow path and changing the path resistance according to its shape, number and height
You .

[0017] FIG. 3, the length of the inlet portion of the auxiliary ridges 18-2 2
With changing of, and narrower as closer to the middle HazamaTakashijo 8c these intervals, showing an example of adjusting the passage resistance of the small flow path.

The refrigerant also likely contain the refrigerant in small passages which open near the refrigerant outlet 4 for flow of refrigerant, since the hardly contains the refrigerant in small passages away from the refrigerant inlet 4, in any small channels of to facilitate contains the, the inlet portion of the auxiliary Takashi Article in the structure of FIG. 1
By changing the length, the auxiliary ridges 18-2 second tip refrigerant outlet 4
Are arranged in a V-shape. After arranging in this manner, the cross-sectional area (width) of the small flow path is further changed as described above.
Have you row Do not adjust the passage resistance Ete. The outlet portion of the coolant need not be arranged in this way the tip of the ridge,
Each ridge,
Since the refrigerant port is formed symmetrically, the tip of the auxiliary ridge
Is the same V-shaped arrangement in the outlet portion.

FIG. 4 shows an auxiliary ridge 18 on the outer peripheral side,
The distal end portions 18a, 23a of the auxiliary ridges 23 on the inner peripheral side are moved toward the center of the refrigerant ports 4, 5 so as to control the amount of refrigerant flowing into each small flow path.

Japanese Utility Model Application Laid-Open No. 61-181210 discloses that a linear auxiliary ridge having a different width is formed in a U-shaped flow path. The purpose of the present invention is to make the inflow of the fluid into the small flow path formed by the U-shaped auxiliary ridge to prevent a stagnant portion from being generated at the corner of the flow path. , And the effect is different.

[0021]

(1) The U-shaped flow path of the refrigerant formed in the element is divided into a plurality of U-shaped small flow paths, and the cross-sectional area (width) of each of the small flow paths is calculated from the original U-shaped flow path. Also, since the lateral movement of the refrigerant is suppressed, the refrigerant does not accumulate in the bent portion.

(2) By adjusting the passage resistance of the small flow passages, the degree of heat exchange of the refrigerant passing through each small flow passage can be made equal, and the heat exchange efficiency of the entire evaporator can be improved.

[Brief description of the drawings]

FIG. 1 is an inner view of a tube sheet showing an embodiment of the present invention.

FIG. 2 is a side view of the tube sheet.

FIG. 3 is an inner view of a tube sheet showing another embodiment of the present invention.

FIG. 4 is an inner view of a tube sheet showing still another embodiment of the present invention.

FIG. 5 is a side view illustrating a conventional laminated evaporator.

FIG. 6 is a bottom view of this.

FIG. 7 is a sectional view taken along the line AA of FIG. 5;

FIG. 8 is an inner perspective view of a conventional tube sheet for producing an element.

FIG. 9 is an inner view of another example of the conventional tube sheet.

FIG. 10 is an inner view of a tube sheet showing a state in which a refrigerant has accumulated in the element.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 evaporator 2 element 2 a flow path 3 fin 4, 5 refrigerant port 4 a, 5 a semi- tubular part 6, 7 tank 8 tube sheet 8 a flat plate part 8 b edge 8 c middle ridge 8 d round bead 8 e inclined bead 8 f elliptical bead 9 inlet pipe 10 Outlet pipe 11 Partition plate 12, 13 Tank part 14, 15, 16, 17 Reservation part 18 Auxiliary ridge 18a Tip 19, 20, 21, 22, 23 Auxiliary ridge 23a Tip 24, 25, 26, 27, 28, 29 Small flow path

Claims (1)

(57) [Scope of request for utility model registration] 1. An edge (8b) having a rounded corner at four sides of a rectangular metal plate, and an intermediate ridge protruding from the center of one of the edges into the metal plate at right angles thereto. The refrigerant ports (4) (5)
In the element of the laminated evaporator, two tube sheets (8) formed by raising the semi-tubular portions (4a) and (5a) are overlapped in the middle and brazed. And a middle ridge (8c) formed in a U-shaped refrigerant flow path, the refrigerant port (4) being parallel to three sides of the edge (8b).
A plurality of U-shaped auxiliary ridges (18) opening toward (5)
22) to divide the original U-shaped flow path into a plurality of U-shaped small flow paths (24 to 29). Each auxiliary ridge has a rounded corner and a middle ridge. A stacked evaporator element in which the cross-sectional area of the small flow path remote from the strip (8c) is larger than the cross-sectional area of the small flow path near the intermediate ridge (8c).