JPH028666A - Coolant distributor - Google Patents

Abstract

PURPOSE:To provide a coolant distributing pipe in which its main pipe has a large diameter and its distributing pipe has a small diameter, it has more than three distributing pipes, its manufacturing is simple and less expensive by a method wherein the outer diameter of each of the distributing pipes is smaller than the outer diameter of the main pipe, and more than three distributing pipes are arranged. CONSTITUTION:A pipe 12 with one blind end is formed, lead 9 is flowed into the pipe and then the pipe is bulge worked with a single-action press so as to make four projected distributing pipes 10. After extremity ends A to A', and B to B' of the projected distributing pipes are cut, the lead within the pipes is molten, then one end of the main pipe is a blind pipe and four projected main pipes 10 can be made. The distributing pipes 10 are bent to such a shape as one corresponding to a pipe of a heat exchanger and a pipe so as to make a final product of coolant distributing pipe. Since this coolant distributing pipe is made by a bulge formation, it has less number of defects such as pin hole and the like as compared with those of the product made by a welding or a casting and the like and further there is no fear of leaking of coolant liquid or gas and the device having a high reliability can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigerant distributor used for connecting refrigerant piping to evaporators and condensers of air conditioners, refrigerators, freezers, and the like.

[Conventional technology and its issues] Heat exchange tubes for heat exchangers used in evaporators and condensers of air conditioners, refrigerators, freezers, etc. generally have poor performance outside the tube compared to inside the tube, so they are relatively poor. There is a tendency to enlarge the extratubular surface. However, since it is necessary to ensure the necessary flow rate of refrigerant due to the capacity of the air conditioning equipment itself, the diameter of this pipe is large. Therefore, in order to connect the thick pipes and the thin heat exchange pipes, it is necessary to connect them using a distributor. In an air conditioner consisting of
The heat exchange tube (4) of the evaporator usually has an outer diameter of 7.0 mm, and the evaporator and pressure Ii? Piping for machine i, condenser, compressor and condenser, etc. is 9.5 +nI++φ
pipe is used. A refrigerant distributor is used to connect the heat exchange tubes (4) and piping (5) with different diameters. As shown in Fig. 7, this refrigerant distributor is an evaporator in which refrigerant such as fins evaporates through a number of meandering heat exchange tubes (4) passing through a number of fins (5) to perform heat exchange. (6)
In the case of , the heat exchange tube (4) has an outer diameter of 7.0 m and the piping is 9.0 m.
This refrigerant distributor (7) is large, with an original diameter of 9.53 mφ, and is branched into two pipes with an outer diameter of 7.0 wsφ. Two 2. It is connected to the cross-section 1 mulberry pipe. By the way, this refrigerant distributor is mainly made of a material with good corrosion resistance and workability, such as copper, and is manufactured by welding or bulge processing. However, since welding is expensive, it is usually manufactured by bulge processing. For example, as shown in Fig. 8, a manufacturing method using bulge processing involves first filling a copper tube (8) with a low melting point metal such as lead (9) as shown in Fig. 8 (a), and then using a double press press or a single press press. (b)
A tube is formed with a protruding shape as shown in (C), and the ends of each tube are cut as shown in (C). Then, the lead packed inside is melted and removed as shown in (d). As shown in e), the pipe is bent into a desired shape to form a refrigerant distributor.

However, in the manufacturing method using bulge processing described above, since a pipe is processed that is open at both ends, it is possible to manufacture pipes in which the outer diameter of the main pipe and the pipe diameter of the distribution pipe are equal, but it is possible to manufacture a pipe that is thinner than the main pipe. It was difficult to do so, and it was also considered impossible to form three or more distribution pipes so that they protruded.

On the other hand, as a heat exchanger such as the above-mentioned evaporator, two heat exchange tubes as shown in Fig. 7 are arranged in parallel to reduce the pressure loss inside the tubes and increase the heat exchange efficiency by increasing the outer surface of the tubes.
There is also an idea to increase the heat exchange efficiency by arranging three or four trees in parallel. This connection requires a refrigerant distribution pipe that has a large diameter main pipe, a small diameter distribution pipe, and three or more distribution pipes. Furthermore, heat exchangers such as evaporators are required to be smaller and lighter in heat exchange efficiency, and refrigerant distributors are also desired to be smaller and easier to install.

[Problem to be solved by the invention]

As a result of studying the above-mentioned problems, the present invention has developed a refrigerant distributor that has a thick main pipe, a thin distribution pipe, and three or more distribution pipes, and is easy to manufacture and inexpensive.

[Means and effects for solving the problem] The present invention provides an arrangement in which the outer diameter of the distribution pipe is smaller than the outer diameter of the main pipe (and the number of distribution pipes is reduced to 3).
This is a refrigerant distribution pipe characterized by the above.

That is, the present invention is a refrigerant distributor, for example, as shown in FIG. 1(d), in which the original type (1) is thick and the distribution pipe 00) is thin, and the number of distribution pipes is four. Furthermore, as shown in FIG. 2, even if there are four distribution pipes, the positions of the main pipe and the distribution pipe are different from each other, so that the shape can be made compact and easy to attach to the heat exchange pipe. The method of manufacturing this refrigerant distributor is, for example, by bulge processing, but as shown in Fig. 1(a), one end of the pipe is blind (Q2) (-) by pressing a copper round rod or a copper disk into the membrane. (preferably from a cost perspective)
Filled with a low melting point metal such as lead (9), this is pressed into a main tube (11
) A thinner distribution pipe 00) is formed to protrude by bulge processing, the tips of the protruding portion A-A' and B-B' are cut, and then the lead inside is dissolved and removed as shown in (C). d)
As shown in the figure, the distribution pipe is bent into the required shape to form a refrigerant distributor.

In addition to the above-mentioned bulge processing, it is also possible to manufacture copper by brazing with silver solder or the like, or by brazing using a brazing material and crund material in the case of aluminum.

In addition to the shape of the refrigerant distributor of the present invention shown in Figs. 1 and 2, in which the distribution pipes are made of four wood, for example, the shape of the refrigerant distributor shown in Fig. 3(a) is shown in which lead has been removed. distribution pipe 0
0) with three distribution pipes bent in the same axial direction as the main pipe (!1), and one with the shape shown in Fig. 4(a).
As shown in b), one distribution pipe may be placed slightly below the axial direction, and the two distribution pipes may be bent in the circumferential direction, and various other shapes may be used. The number of the above-mentioned distribution pipes can be 3 to 8 for the main pipe 1, which is easy to manufacture in bulge processing.

This number can be appropriately selected depending on the connection location of the heat exchanger, and various shapes other than those described above can be applied.

Figure 5 shows that the main pipe (11) has a large diameter and the distribution pipe 00) is thin, and a three-tree refrigerant distributor is used to connect three heat exchange pipes (4) in parallel. This is an example of an evaporator with improved heat exchange efficiency.

As mentioned above, the present invention has a thick main pipe and a small diameter distribution pipe,
The present invention is a refrigerant distributor having three or more distribution pipes, and can be easily manufactured in various shapes through a relatively simple process.

In addition, by using this refrigerant distributor to connect the pipes of heat exchangers such as Aoi generators and condensers, it is possible to install three or more heat exchange pipes in parallel, which is more efficient than the conventional two-wood parallel arrangement. It is possible to make a good heat exchanger.

〔Example〕

An embodiment of the present invention will be described below.

A copper round bar with an outer diameter of 9.5 nus and a length of 20 mm was used with a die and a punch to form a one-end blind pipe θ2 with an outer diameter of 9.53 mm, a wall thickness of 1 m, and a length of 50 mm as shown in Fig. 1(a).
, lead (9) is poured into the inside of the lead (9), and then bulge processing is performed using a one-sided press to form the shape shown in the same figure (b).
A distribution pipe with an outer diameter of 7.0 mm and a length of 30 mm as shown in 00)
Four protrusions were formed. This protruding tip A-A', B-B
After cutting ', the lead inside was melted to create a tube with one end blank as shown in (C), with four distribution tubes protruding from it. The distribution pipe was bent into a shape that matched the pipe to form a final refrigerant distributor as shown in (d).

Since this refrigerant distributor is manufactured by bulge processing, it has fewer defects such as pinholes than welded or cast products, and has high reliability without worrying about refrigerant liquid or gas leaks.

〔effect〕

As explained above, according to the present invention, a refrigerant distributor used for connecting pipes of an evaporator and a condenser can be easily obtained, and has a significant industrial effect.

[Brief explanation of the drawing]

FIGS. 1, 3, and 4 show a refrigerant distributor according to an embodiment of the present invention! ! ! FIG. 2 is a perspective view of a refrigerant distributor according to an embodiment of the present invention, FIG. 5 is a perspective view of an evaporator equipped with the refrigerant distributor of the present invention, and FIG. 6 is an air conditioner. FIG. 7 is a perspective view of an evaporator equipped with a conventional refrigerant distributor, and FIG. 8 is an explanatory diagram showing the manufacturing process of a conventional refrigerant distributor. 1.6... Evaporator, 2... Condenser, 3... Compressor, 4... Heat exchange tube, 5... Piping, 7...
Refrigerant distributor, 8...Copper tube, 9...Lead, 10.
...Distribution pipe, 11...Main pipe. Patent applicant Furukawa Electric Co., Ltd. Figure 3 (C) Figure (d) (a) Figure 4 (b) Figure 2 Figure 5 4 Heat exchange tube Figure 6 Figure 7 Figure 8

Claims (2)

[Claims] (1) A refrigerant distributor characterized in that the outer diameter of the distribution pipe is smaller than the outer diameter of the main pipe, and the number of distribution pipes is three or more. (2) The refrigerant distributor according to claim 1, characterized in that the number of main pipes is 1 and the number of distribution pipes is 3 to 8.