JPH0519714Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a stacked evaporator mainly used in air conditioners for automobiles.

(Prior Art) The conventional stacked evaporator shown in FIG. 6 has two tank components 2a and 2b as shown in FIG.
A pair of tube sheets 4 in which refrigerant flow passages 3 are formed to communicate the tank components 2a and 2b are joined together to form a flat tube 5, and this flat tube 5 is inserted through a corrugated fin 6. It is formed by laminating a large number of layers.

An outlet pipe 8 is connected to the upper tank part 7, an inlet pipe 10 is connected to the lower tank part 9, and an expansion valve 11 is attached to the inlet pipe 10.

The outlet pipe 8 is connected to a compressor (not shown), and the opening degree of the refrigerant throttle valve in the expansion valve 11 is determined depending on the temperature of the refrigerant transmitted from the temperature-sensitive cylinder 12 via the capillary reach tube 13. It is becoming more and more controlled. In the figure, 14 is a pressure equalizing pipe.

(Problems to be solved by the invention) However, in the stacked evaporator 1 to which such an expansion valve 11 is attached, the expansion valve 11
exists in front of the air flow, resulting in wasted space where heat is not exchanged.In addition to the work of connecting the expansion valve 11 to the inlet pipe 10,
This has the disadvantage that the work of attaching the temperature sensing cylinder 12 to the outlet pipe 8 and the piping work of the pressure equalizing pipe 14 are very complicated.

Therefore, as shown in Utility Model Application Publication No. 60-82170,
A stacked evaporator has been developed in which a refrigerant inlet port and a refrigerant discharge port are provided on the end plate of the stacked evaporator, and an expansion valve having an integrally formed temperature-sensitive cylinder is assembled therein.

However, even with such an evaporator, the expansion valve is attached to the end plate side of the evaporator, so when the evaporator 1 is attached to the lower part of the automobile instrument panel 15 as shown in FIG. There is a risk that the overhang dimension L from 16 will become large, so in order to keep this overhang dimension L below the standard value,
This has the disadvantage that the area of the evaporator 1 in the air flow direction must be reduced by the size occupied by the expansion valve 11.

Furthermore, as shown in Figures 7A and 7B (members that are the same as those shown in Figure 5 are given the same reference numerals), conventional stacked evaporators have a front-to-back relationship in the air flow direction. outlet tank 7 and inlet tank 9
There is a system in which the tank is located only in the upper part, thereby increasing the efficiency of space (see, for example, Japanese Utility Model Application Publication No. 150063/1983).

However, since this stacking type evaporator also has inlet and outlet pipes 8 and 10 on the sides, the above-mentioned drawbacks have not been solved.

Therefore, the inventors of the present invention made a concerted effort and focused on the fact that the tank part of the stacked evaporator is a dead space that does not substantially contribute to heat exchange. In the present invention, an integrated expansion valve is also installed in the heat exchanger without reducing the heat exchange efficiency or disadvantageous in terms of space.

The present invention eliminates the above-mentioned drawbacks and problems, increases the area in the air flow direction of the evaporator with an expansion valve installed in the narrow interior space of the vehicle, and achieves as much cooling capacity as possible within the limited space. An object of the present invention is to provide a stacked evaporator that increases the

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention has an outlet tank and an inlet tank that have a front-to-back relationship in the direction of air flow, and connects both tanks. In a stacked evaporator in which a large number of flat tubes connected by a U-shaped refrigerant flow path are stacked and both tank portions are connected to each other, a bottomed cylindrical adapter is provided between the tanks of the flat tubes. A pair of adapters are provided in close proximity to each other, one of the adapters is in communication with the outlet tank, and the other is in communication with the inlet tank. In a further preferred embodiment, the adapter is connected to a flat tube in the central portion. Each adapter has a branch pipe through which the refrigerant flows through the other adapter, or the adapter has a connector to which an integrated expansion valve is connected.

(Function) The stacked evaporator according to the present invention that employs such means has a structure in which the inlet and outlet pipes are buried in the tank, so the expansion valve can be installed on the front side or the rear side in the air flow direction. Therefore, the area in the air flow direction of the evaporator with an expansion valve disposed in a limited space can be maximized, and the cooling capacity can be increased accordingly. Moreover, even with such a structure, there is no disadvantage in terms of space.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a laminated evaporator showing an embodiment of the present invention, FIG. 2A is a front view showing a tube sheet of the same embodiment, FIG. 2B is a perspective view of an adapter of the same embodiment, and FIG. FIG. 3 is a cross-sectional view of the main parts of the same embodiment showing the state in which the integrated expansion valve is installed, and FIG. 4 is a cross-sectional view showing the internal structure of the integrated expansion valve, and the members shown in FIGS. The same reference numerals are given to the same members.

This laminated evaporator 30 is molded using a tube sheet 4 shown in FIG. , two tank components 2a and 2b, and a recess that constitutes a U-shaped refrigerant flow path 3 are formed. These tank components 2a and 2b communicate with each other through a through hole O and also with the refrigerant passage 3.

In the laminated evaporator 30, a flat tube 5 is formed by joining two tube sheets 4 in the middle, and a large number of the flat tubes 5 are laminated with corrugated fins 6 interposed therebetween.

As shown in FIG. 1, this stacked evaporator 30 has an outlet tank 7 and an inlet tank 9 which are arranged in a front-to-back relationship in the air flow direction. The refrigerant passages 3 are connected to each other, and the inlet tank 9 is supplied with refrigerant by an adapter 32, and the outlet tank 7 collects the refrigerant that has passed through the refrigerant passages 3. It is designed to flow out from the stacked evaporator 30.

More specifically, the laminated evaporator 3
A pair of bottomed cylindrical adapters 32 and 33 are provided close to each other between the flat tubes 5 at the center of the upper part of the tube, as shown in FIG. 2B.
This adapter 32 communicates with the inlet tank 9, and the other adapter 33 communicates with the outlet tank 7, but inside the adapter 32 there is a short branch pipe 34.
However, the other adapter 33 is provided with a branch pipe 35, and the refrigerant flowing through each adapter 32, 33 flows along the circumference of the branch pipes 34, 35, and the refrigerant flows through the through hole 3.
It is starting to flow out from 7,36. In other words, the adapters 32 and 33 replace the aforementioned inlet and outlet pipes 8 and 10, and the adapter 32 allows the refrigerant to flow into the inlet tank 9 from the through hole 37 at the end, and the adapter 33 allows the refrigerant to flow into the inlet tank 9 from the through hole 37 at the end. Through hole 3
The refrigerant that has flowed into this adapter 33 from 6 is made to flow out. Here, the through holes 36, 3
7 and the tank, the portions of the flat tube 5 that protrude from the through holes 36 and 37 (which may protrude from the adapter) are molded so that they communicate when the flat tubes 5 are stacked. It is desirable to configure the

By using the adapters 32 and 33 configured in this way, the inlet and outlet pipes 8 and 10 can be connected without narrowing or obstructing the air circulation portion of the stacked evaporator 30.
Alternatively, not only can an integrated expansion valve 38 or the like be installed, but also the flow of refrigerant, which will be described in detail later, can be made smooth.

Further, the integrated expansion valve 38 can be installed, for example, by using the adapter 32, as shown in FIG.
Connector 39 is brazed to the open end of 33,
The integrated expansion valve 38 may be connected to the inlet/outlet portions 40a, 40b to this connector 39.

The connector 39 has through holes 39a and 39b, and the expansion valve block 4 is inserted into the through holes 39a and 39b.
The expansion valve block 41 may be attached to the connector 39 with bolts 42 by fitting the inlet/outlet portions 40a, 40b of the expansion valve block 41 into the connector 39.

Further, inside this expansion valve block 41, there is an inlet side flow path 43 that communicates with the adapter 32, and an inlet side flow path 43 that communicates with the adapter 32.
An outlet side flow path 44 communicating with the inlet side flow path 43 is formed, and a valve body 45 is provided in the inlet side flow path 43.
3 is a power element 4 sealed with temperature-sensitive gas.
6 is provided, and this power element 46 cooperates with the valve body 45 through a valve rod 47, and adjusts the gap between the valve body 45 and the valve seat 48 according to the temperature of the refrigerant flowing through the outlet flow path 44. I try to do that.

Next, the effect will be explained.

The refrigerant flowing into the adapter 32 from the inlet portion 40 a of the integrated expansion valve 38 flows along the outer periphery of the branch pipe 34 and flows into the inlet tank 9 through the branch pipe 35 and the through hole 37 .

In this case, even if the tank is formed by stacking the tank parts of the flat tubes 5, that is, a tank with many partition-shaped plates protruding inside, the refrigerant will surely flow to the end, and stagnation will not occur. Flows smoothly without drifting.

The refrigerant in this inlet tank 9 is supplied to each flat tube 5.
While passing through the refrigerant passage 3, the refrigerant exchanges heat with the air, evaporates, and gasifies. This gas refrigerant is passed from the outlet tank 7 through the branch pipe 34 and the through hole 36 to the adapter 3.
3 into the outlet portion 40b of the integral expansion valve 38.
More leakage.

In the above-mentioned embodiment, the adapter 32 and the inlet tank 9 and the adapter 33 and the outlet tank 7 are connected to each other, but on the other hand, the adapter 32 and the outlet tank 7 are connected to each other, and the adapter 33 and the inlet tank 9 are connected to each other. You may also do so.

[Effects of the invention] As explained above, according to the invention, since the inlet/outlet pipe is buried in the tank, the expansion valve can be installed on the front side or the rear side in the air flow direction, and there are no limitations. The area of the evaporator with an expansion valve installed in the space can be maximized in the air flow direction, and the cooling capacity can be increased. Moreover, even with this structure, there is no disadvantage in terms of space, and the expansion valve can be assembled to the evaporator very easily, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a laminated evaporator showing an embodiment of the present invention, FIG. 2A is a front view showing a tube sheet of the same embodiment, FIG. 2B is a perspective view of an adapter of the same embodiment, and FIG. 3 is a cross-sectional view of the main parts of the same embodiment showing the state in which the integrated expansion valve is installed, FIG. 4 is a cross-sectional view showing the internal structure of the integrated expansion valve, and FIG.
The figure is an exploded perspective view showing the main parts of a conventional laminated type evaporator, Figure 6 is a front view of the same laminated type evaporator, Figure 7A is a front view of another laminated type evaporator, and Figure 7B is a The plan view of FIG. A and FIG. 8 are schematic diagrams showing a state in which a conventional stacked evaporator is mounted on a vehicle. 3... Refrigerant flow path, 5... Flat tube, 7...
Outlet tank, 9...Inlet tank, 30...Stacked evaporator, 32, 33...Adapter, 34,
35...branch pipe, 38...integrated expansion valve, 39...
…connector.

Claims (1)

[Claims for Utility Model Registration] 1. It has an outlet tank 7 and an inlet tank 9 in a front-to-back relationship in the direction of air flow, and these tanks are connected to the U
In a stacked evaporator in which a large number of flat tubes 5 connected by a letter-shaped refrigerant flow path 3 are stacked and both tank portions are connected to each other, a bottomed cylindrical tube is provided between the tanks of the flat tubes 5. A stacked type evaporator is provided with a pair of adapters 32 and 33 adjacent to each other, one of which communicates with the outlet tank 7 and the other with the inlet tank 9. 2. The adapters 32, 33 are provided in the flat tube 5 in the central part, and each adapter 32, 33 has a branch pipe 34, 35 through which the refrigerant flows through the other adapter 33, 32. A stacked evaporator according to claim 1 of the patent registration claim. 3 The adapters 32 and 33 are connected to the integrated expansion valve 3
8. A stacked evaporator according to claim 1, which has a connector 39 to which a connector 8 is connected.