JPH087266Y2 - Stacked heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The laminated heat exchanger according to the present invention is used as an evaporator for cooling air by being incorporated in an air conditioner for a vehicle, for example.

(Prior Art) An air conditioner incorporates an evaporator that evaporates a refrigerant inside and cools air flowing outside.

As such an evaporator that is used by being incorporated in an air conditioner, a so-called laminated structure, which is conventionally formed by laminating a plurality of metal plates as described in JP-A-62-798, for example, is known. A type evaporator is used.

As shown in FIG. 10, this laminated evaporator is constituted by laminating a plurality of units 2 and 2 each of which is formed by combining two metal plates 1 and 1 in the middle.

As shown in FIGS. 11 to 12, each metal plate 1, 1 has a flat portion 3 surrounding the entire circumference of each metal plate 1, 1, and a shallow first portion formed in a U shape inside the flat portion 3. One concave portion 4, deep second and third concave portions 5 and 6 formed at both ends of the first concave portion 4, and through holes 7 and 8 formed in central portions of the second and third concave portions 5 and 6, respectively. Is provided. Further, a plurality of ridges 9, 9 are provided inside the first recess 4 so as to disturb the flow of the refrigerant inside the first recess 4.

A plurality of units 2 and 2 forming a laminated evaporator
Are two metal plates 1 each having the above-mentioned shape,
As shown in FIG. 10, the flat portions 3 and 3 of the metal plates 1 and 1 are butted against each other and are combined in the middle to form a U-shaped portion surrounded by the first recesses 4 and 4. The flat pipe portion 12 through which the refrigerant flows is designed so that the portion surrounded by the second and third concave portions 5 and 6 functions as a part of the inlet side tank or the outlet side tank.

A plurality of units 2 and 2 as described above are provided as shown in FIG.
By stacking the outer surfaces of the third recesses 5 and 6 against each other, they are laminated,
An inlet pipe 10 is provided in one of the pair of spaces formed by the second and third recesses 5, 6 and an outlet pipe 11 is provided in the other space.
Each is connected.

In the state where the plurality of units 2 and 2 are stacked in this manner, the corrugated fins 13 and 13 are sandwiched between the flat tube portions 12 and 12 of the adjacent units 2 and 2, and the flat tube portions 1 and 2 are adjacent to each other.
The heat exchange between the air flowing between 2 and 12 and the refrigerant flowing inside the flat tube portions 12 and 12 is favorably performed.

Since the laminated evaporator is constructed and constructed as described above, when a liquid refrigerant is fed from the inlet pipe 10 into one of the spaces functioning as an inlet side tank, the refrigerant is flattened by the plurality of units 2, 2. While flowing through the pipe sections 12, 12, evaporate by exchanging heat with the air flowing between the fins 13, 13 provided outside the flat tube sections 12, 12, and then as an outlet side tank It is sent to the other functioning space and discharged through the outlet pipe 11.

By the way, in order to improve the performance of such a laminated evaporator, the number of times that the flow direction of the refrigerant changes inside the laminated evaporator is increased so that the refrigerant enters from the inlet pipe 10 and reaches the outlet pipe 11. It is effective to lengthen the flow path and increase the flow velocity of the refrigerant in the evaporator.

As shown in FIG. 10, simply by connecting the inlet pipe 10 to one space that functions as an inlet side tank and connecting the outlet pipe 11 to the other space that functions as an outlet side tank, the flow direction of the refrigerant is Since it changes only once, the refrigerant flow speed is slow, the heat exchange efficiency between the refrigerant and the evaporator is poor, and it is not always possible to obtain sufficient cooling performance, and the unevaporated refrigerant is sent from the outlet pipe 11. There is a case to be issued.

Therefore, conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 63-197977, by incorporating an adapter into a part of the laminated evaporator, the number of times the direction of the refrigerant changes is increased, and the performance of the laminated evaporator is increased. It is considered to improve.

That is, the adapter disclosed in the above publication is constructed as shown in FIGS.

This adapter 14 is a connection portion for connecting a refrigerant transfer pipe to one end of a main body 15 made by drawing a metal pipe.
16 is provided, and the other end opening is closed by the packing 17 and the lid piece 18. The intermediate portion of the main body 15 is crushed as shown in FIG. 14 to form a closed portion 19, and two flat surfaces 20, 20 parallel to each other are formed on both sides of the closed portion 19 to form a total of four surfaces. ing. Then, the through holes 2 are formed in the flat surfaces 20 and 20, respectively.
1, 21 are formed so that the inside and outside of the main body 15 can communicate freely.

As shown in FIG. 15, the adapter 14 configured as described above is sandwiched between the units 2 and 2 constituting the laminated evaporator, and the through holes 7 provided in the units 2 and 2,
8 (see FIGS. 11 to 12) and the through holes 21 and 21 are aligned with each other so that the units 2 and 2 and the units 2 and
2 and the adapters 14, 14 are brazed to each other.

In this way, by incorporating the adapters 14 and 14 between the units 2 and 2 which constitute the laminated evaporator,
The number of times the flow direction of the refrigerant flowing in the laminated evaporator changes, and the performance of the laminated evaporator is improved.

For example, two adapters 14 as shown in FIG. 13,
When assembled in the positions shown in Fig. 10, respectively,
As shown by the solid arrow a in FIG. 16, the refrigerant has a flow direction of 3
It changes while changing over time.

As a result, the flow velocity of the refrigerant in the laminated evaporator is increased, heat exchange between the refrigerant and each of the units 2 and 2 is favorably performed, and the length of the flow path is increased to evaporate the refrigerant. As a result, the non-evaporated refrigerant is never sent out from the outlet pipe.

In Japanese Utility Model Laid-Open No. 64-54686, as shown in FIGS. 17 to 18, a part of the metal plate 1 constituting the unit 2 is provided with a through hole 7.
The locking projections 24, 24 are formed on the peripheral edge of the opening of (or 8), and the locking projections 24, 24 are engaged with the inner peripheral edge of the through hole 21 of the adapter 14 to form the unit 2. A device for restricting the positional relationship with the adapter 14 is described.

(Problems to be solved by the invention) However, in the laminated heat exchanger incorporating the adapter 14 configured as described above and acting as described above, there are the following problems to be solved. Exists.

That is, in order to adjust the performance of the laminated heat exchanger, when changing the width dimension (horizontal dimension in FIG. 10) of this laminated heat exchanger, the number of units 2, 2 to be laminated is changed. In order to make the amount of the refrigerant flowing through the units 2 and 2 uniform, the area of the passage through which the refrigerant flows between the adapter 14 and the unit 2 must be changed according to the number of the stacked units 2 and 2. I have to.

The area of the passage is determined by the areas of the through holes 7 and 8 formed in the metal plates 1 and 1 and the through holes 21 formed in the adapter 14, which are included in the units 2 and 2, respectively.
The areas of the through holes 7 and 8 and the through hole 21 were changed according to the number of layers to be laminated.

For this reason, it is necessary to prepare the units 2 and 2 and the adapter 14 only for the types corresponding to the types of the laminated heat exchangers having different width dimensions, which is troublesome for manufacturing the components 2 and 14 and managing the components. This has been a cause of increasing the product cost.

The laminated heat exchanger of the present invention eliminates the above-mentioned inconvenience.

(Means for Solving the Problems) The laminated heat exchanger of the present invention has a flat portion that surrounds the entire circumference and a U-shape inside the flat portion, like the conventional laminated heat exchanger described above. A shallow first concave portion, deep second and third concave portions formed at both ends of the first concave portion, and first through holes formed in central portions of the second and third concave portions. A plurality of units formed by combining a plurality of metal plates in the middle are laminated together, and a connecting portion for connecting the end portion of the fluid transfer pipe to one end and a second portion for passing the fluid to the side surface are formed. The adapter having the through holes is attached to the side surface of one of the units in a state where the first through hole and the second through hole are aligned with each other.

Further, in the laminated heat exchanger of the present invention, the adapter and the unit facing the adapter are provided at one of both end positions of the first through hole and both end positions of the second through hole. Two tongue-shaped locking projections are formed on the other side, and two locking notches that engage with the locking projections are formed on the other side. The width dimension of the first through hole or the second through hole extending in the direction perpendicular to the line connecting the two is set to a certain maximum width dimension, and the width dimension of the second through hole or the first through hole is By setting the dimension to be equal to or smaller than the maximum width dimension, the area of the fluid passage existing between the adapter and the unit can be adjusted.

If the thickness of the adapter is such that the space between adjacent units is the same, the second and third recesses are formed at both ends of the metal plate that constitutes the plurality of units and faces the adapter. do not do.

(Operation) The operation itself of the laminated heat exchanger of the present invention configured as described above is the same as that of the conventional laminated heat exchanger described above.

However, in the laminated heat exchanger of the present invention, in order to adjust the performance of the laminated heat exchanger, the number of units to be laminated is changed, and accordingly, the fluid is circulated between the adapter and the unit. Even when the area of the passage to be changed is changed, it can be adjusted simply by changing the width dimension of the second through hole of the adapter or the first through hole of the unit facing the adapter.

For this reason, if only a plurality of types of either the adapter having the second through hole or the unit having the first through hole facing the adapter is prepared, a plurality of types of laminated heat exchanges having different width dimensions can be prepared. It is possible to configure a container and make the amount of fluid flowing through each unit uniform.

The unit with the first through-hole or the adapter with the second through-hole has a passage area even if the width dimensions of the stacked heat exchangers (the number of stacked units are different) are different. The same one can be used except the one adjusted.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 to 6 show a first embodiment of a laminated heat exchanger according to the present invention. FIG. 1 is a side view of an end portion of a metal plate constituting a unit, and FIG. 2 is a bottom view of FIG. As seen, FIGS. 3 to 5 show an adapter attached to the unit, and FIG. 3 shows an adapter having a second through hole having a small width,
The drawing shows a side view showing an adapter having a second through hole having an intermediate width dimension, FIG. 5 shows a side view showing an adapter having a second through hole having a large width dimension, and FIG. 6 shows an adapter and a unit. It is sectional drawing which shows the state which combined and.

The laminated heat exchanger of the present invention, like the above-mentioned conventional laminated heat exchanger, has a flat plate surrounding the entire circumference on one metal plate 1 as shown in FIG. 10 to 12 or FIG. The portion 3, the shallow first concave portion 4 formed in a U shape inside the flat portion 3, and the deep second and third concave portions 5 and 6 formed at both ends of the first concave portion 4.
And a pair of metal plates 1 and 1 having first through holes 7 and 8 formed in the central portions of the second and third recesses 5 and 6, respectively, in the middle of the unit 2 and 2. A plurality of the above, and an adapter 14 having a connecting portion 16 for connecting the end portion of the fluid transfer pipe at one end and second through holes 21, 21 for allowing the fluid to pass through on the side surface, respectively. With the first through holes 7 and 8 and the second through holes 21 and 21 aligned with each other on the side surface of one of the units 2. As shown in FIG. 6, only the shallow first concave portion 4 and the deep second and third concave portions 5 and 6 are not formed in the metal plate 1 facing the side surface of the adapter 14.

Further, in the laminated heat exchanger of the present invention, the first through hole 7 formed in the metal plate 1 facing the adapter 14
At the peripheral edge of 8, locking projections 25, 25 are formed at both end positions in the length direction (left and right direction in FIG. 1) by bending the tongue-shaped portions formed at the both end positions.

In addition, at the peripheral portions of the second through holes 21, 21 formed on the side surface of the adapter 14, the locking projections 25, 25 are provided at both end positions in the length direction.
Forming locking notches 26, 26 for engaging with.

The width dimension W of the first through holes 7, 8 formed at the end of the metal plate 1, that is, the direction perpendicular to the line connecting the locking projections 25, 25 (the vertical direction in FIG. 1). The dimension is a fixed maximum width dimension.

Along with this, the width dimension w of the second through holes 21, 21 formed on the side surface of the adapter 14 is set to be the maximum width dimension W or less (W ≧
w).

The area of the fluid passage existing between the adapter 14 and the unit 2 can be adjusted by changing the width dimension w of the second through holes 21, 21.

The operation of the laminated heat exchanger of the present invention constructed as described above is the same as that of the conventional laminated heat exchanger described above.
When the performance is changed, the width of the entire unit is changed by changing the number of units 2 and 2 to be stacked.

However, in the laminated heat exchanger of the present invention, in order to adjust the performance of the laminated heat exchanger, the number of units 2, 2 to be laminated is changed, and accordingly, the adapter 14 and the units 2, 2 are changed.
Even when the area of the passage through which the fluid such as the refrigerant is circulated is changed, it can be adjusted simply by changing the width dimension w of the second through holes 21, 21.

That is, when the area of the passage is narrowed, as shown in FIG. 3, the adapter 14 having the second through holes 21 and 21 having the sufficiently small width dimension w is used, and the passage area is slightly widened. 4 is used, the adapter 14 having the second through holes 21, 21 having a slightly larger width dimension w is used as shown in FIG. As shown in the figure, the adapter 14 having the second through holes 21 and 21 having a sufficiently large width dimension w (having the same width dimension as the width dimension W of the first through holes 7 and 8) is used. To do.

As described above, the second through holes 21 having different width dimensions w,
Also in the adapter 14 in which 21 is formed, each second through hole 21,
The distance l between the locking notches 26, 26 provided at both ends in the lengthwise direction of 21 corresponds to the locking projections 25 formed at both ends in the lengthwise direction of the first through holes 7, 8 at the end of the metal plate 1. , 25 equal to the interval L (L =
l) Therefore, even when the adapter 14 having the second through holes 21, 21 having any size is attached to the side surface of the unit 2, it is locked with the locking projections 25, 25. The unit 2 formed by the metal plate 1 in which the notches 26 and 26 are engaged with each other.
And the adapter 14 are positioned.

Therefore, if only a plurality of types of adapters 14 having the second through holes 21, 21 are prepared, only one type of unit 2, 2 composed of the metal plates 1, 1 is prepared, and a plurality of units having different width dimensions are prepared. It is possible to configure various types of laminated heat exchangers and make the amounts of fluids flowing through the units 2, 2 uniform. A laminated heat exchanger having different heat exchange capacities can be constructed by combining an appropriate number of units 2 having metal plates in the middle, but at the same time, an appropriate amount of fluid flowing in the heat exchanger can be obtained. Otherwise, the efficiency of the heat exchanger cannot be increased sufficiently. The present invention provides a laminated heat exchanger whose flow rate can be adjusted simply by changing the area of one of the through holes of the metal plate or the adapter. The area of the through hole can be easily adjusted by changing the width of the through hole of the metal plate or the adapter when the through hole is formed by pressing.

Next, FIGS. 7 to 9 show a second embodiment of the present invention.

In the case of this embodiment, two tongue-shaped locking projections 25 formed at both ends in the lengthwise direction of the first through holes 7, 8 at the end of the metal plate 1,
The shape of 25 is semi-cylindrical, and the shape of the locking notches 26, 26 formed at both ends in the longitudinal direction of the second through holes 21, 21 on the side surface of the adapter 14 is semi-circular. When the tongue-shaped locking projection is formed in a semi-cylindrical shape in this manner, the rigidity is increased, so that the coupling between the unit and the adapter can be further strengthened. These two tab-shaped tongue-shaped locking projections of a flat plate shape or a semi-cylindrical shape can be easily formed when the metal plate 1 is press-molded, and the elliptical shape described in Japanese Utility Model Laid-Open No. 1-88188 It is easier to machine than forming the locking projection of the standing wall.

Other configurations and operations are similar to those of the above-described first embodiment.

In the first and second embodiments described above, the locking projections 25, 25 are provided on the peripheral portions of the first through holes 7, 8 and the second through holes 21, 21.
Although the locking notches 26, 26 are formed at the peripheral edges of the first and second through holes 7, 8, respectively.
The locking projections 25, 25 may be formed on the peripheral portions of the second through holes 21, 21 respectively.

Further, in order to adjust the passage area of the fluid, the through holes whose width dimension is changed can be replaced with the second through holes 21 and the first through holes 7 and 8. In this case, only one kind of adapter 14 is prepared, and a plurality of kinds of units 2 facing the adapter are prepared.

(Effects of the Invention) The laminated heat exchanger of the present invention is configured and operates as described above, but when building different types of laminated heat exchangers, some of the parts may be shared. Production, parts production,
It is possible to reduce the production cost of the laminated heat exchanger by reducing the labor for managing the parts.

[Brief description of drawings]

1 to 6 show a first embodiment of a laminated heat exchanger according to the present invention, and FIG. 1 is a side view of an end of a metal plate which is in contact with an adapter among metal plates constituting a unit, and FIG. The drawing shows a view from the lower side of FIG. 1, and FIGS. 3 to 5 show an adapter attached to the unit. FIG. 3 shows an adapter formed with a second through hole having a small width, The drawing shows a side view showing an adapter having a second through hole having an intermediate width dimension, FIG. 5 shows a side view showing an adapter having a second through hole having a large width dimension, and FIG. 6 shows an adapter and a unit. 7 and 9 show a second embodiment of the present invention, FIG. 7 is a side view of an end portion of a metal plate constituting the unit, and FIG. Fig. 9 is a view from the bottom of the figure, Fig. 9 is a side view of an adapter attached to the unit, and Fig. 10 is a diagram of a conventional laminated heat exchanger. Fig. 11 is a front view showing an example, Fig. 11 is a side view of a metal plate constituting this laminated heat exchanger, Fig. 12 is a sectional view taken along the line AA of Fig. 11, and Fig. 13 is a conventional laminated heat exchanger. FIG. 14 is an exploded perspective view showing an example of the adapter, and FIG. 14 is BB of FIG.
A sectional view, FIG. 15 is a schematic perspective view showing a state in which this adapter is incorporated in a laminated heat exchanger, and FIG. 16 is a schematic perspective view showing a fluid flow direction inside the laminated heat exchanger in which the adapter is incorporated. FIG. 17 is a partially exploded perspective view showing another example of the conventional laminated heat exchanger, and FIG. 18 is a partial front view showing the assembled state. 1: metal plate, 2: unit, 3: flat part, 4: first recess, 5: second recess, 6: third recess, 7, 8: (first) through hole, 9: ridge, 1
0: Inlet pipe, 11: Outlet pipe, 12: Flat pipe part, 13: Fin, 14: Adapter, 15: Main body, 16: Connection part, 17: Packing, 18: Lid piece, 19: Closure part, 20: Flat Face, 21: (second) through hole, 24, 2
5: Locking protrusion, 26: Locking notch.

Claims (2)

[Scope of utility model registration request] 1. A flat portion surrounding the entire circumference, a shallow first concave portion formed in a U shape inside the flat portion, and deep second and third concave portions formed at both ends of the first concave portion. 2 having a second through hole and a first through hole formed in the center of the third recess, respectively
A plurality of units formed by combining a plurality of metal plates in the middle are laminated together, and a connecting portion for connecting the end portion of the fluid transfer pipe to one end and a second portion for passing the fluid to the side surface are formed. In a laminated heat exchanger, an adapter provided with a through hole is attached to a side surface of any unit in a state where the first through hole and the second through hole are aligned with each other. And the unit opposed thereto, two tongue-shaped locking projections are provided at either one of the both end positions of the first through hole and both end positions of the second through hole. And a first through hole extending in a direction perpendicular to a line connecting the locking projections or the locking cutouts with each other. Or the width of the second through hole,
The area of the fluid passage existing between the adapter and the unit is set to a fixed maximum width dimension, and the width dimension of the second through hole or the first through hole is set to the dimension below the maximum width dimension. A laminated heat exchanger characterized by being adjustable. 2. A metal plate constituting a plurality of units,
At both ends of the first recess of the metal plate facing the adapter, the second,
The laminated heat exchanger according to claim 1, wherein the third recess is not formed.