JPH05264126A - Refrigerant separator - Google Patents

Abstract

PURPOSE:To perform the equal separation of a refrigerant from each outflow tube by housing an insertion member whose cross-sectional area becomes gradually larger from the inflow tube connected to one end of a cylindrical tube and which is inserted into the cylindrical tube having a plurality of outflow tube connecting ports in the longitudinal direction. CONSTITUTION:A refrigerant separator is composed of a cylindrical tube 1 provided with a plurality of a heat transfer tube connecting ports 2 for connecting each heating tube (outflow tube) 4 in the longitudinal direction. Both ends of it are sealed by a tube end sealing partition plates 3a, 3b, and a refrigerant inflow tube 6 is connected to the partition plate 3b of the lower one. In such a cylindrical tube 1, on the side where the heating tubes 4 are not inserted that is, on the opposite surface of the heat transfer tube connecting ports 2, an inserted member 6 whose cross-sectional area becomes gradually larger from the inflow tube 5 by cutting a cylinder is inserted. Therefore, distribution of the refrigerant to each heating tube 4 is equally performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant flow divider for a heat exchanger used in refrigeration equipment and air conditioning equipment.

[0002]

2. Description of the Related Art An evaporator that constitutes a refrigeration cycle is
If the evaporator is small, the internal resistance of the refrigerant is small and the refrigerant passage may be one flow path, but if the evaporator is large, the total flow rate of the refrigerant is large and the internal resistance is large, so a refrigerant shunt is used. A method of dividing the passage into a plurality of passages to reduce the resistance in the tube is often used. In order for the refrigerant flow divider to fully exhibit the performance of the evaporator, it is required that the refrigerant is evenly distributed to each flow path.

A refrigerant distributor shown in Japanese Patent Laid-Open No. 3-31665 will be described below as an example of a conventional refrigerant distributor with reference to the drawings.

FIG. 5 is a perspective view of a conventional refrigerant flow divider, and FIG. 6 is a sectional view. 5 and 6, reference numeral 21 denotes a cylindrical tube having a plurality of heat transfer tube connection ports 22 provided in the longitudinal direction, and both ends thereof are sealed by partition plates 23a and 23b for sealing the tube ends. 24
Is a heat transfer tube connected to the heat transfer tube connection port 22 of the cylindrical tube 21. Reference numeral 25 is a refrigerant inflow pipe connected to a hole provided in the partition plate 23b. Reference numeral 26 is a semi-cylindrical insertion member inserted into the inside of the cylindrical tube 21, and as shown in FIG. 7 showing a perspective view of the insertion member 27, the tip of the heat transfer tube 24 inserted from the heat transfer tube connection port 22 is inserted. Is provided with a plurality of holes.

The operation of the refrigerant flow divider thus configured will be described below with reference to the drawings.

FIG. 8 is a front view of an evaporator using a conventional refrigerant flow divider. In FIG. 8, 27 is a fin connected between the heat transfer tubes in order to improve heat exchange efficiency. The evaporator exchanges heat between the airflow flowing through the fins 27 and the outer surface of the heat transfer tube 24 and the refrigerant R flowing inside the heat transfer tube 24, and the refrigerant shunt divides the plurality of refrigerant R flowing from the refrigerant inflow pipe 25. Of the heat transfer tubes 24.

Generally, since the refrigerant at the inlet of the evaporator flows in a gas-liquid two-phase state, the gas phase and the liquid phase are vertically separated due to the influence of gravity, and the gas phase component is separated in the upper heat transfer tube. In many cases, the lower heat transfer tube has a large amount of liquid phase and is likely to have an uneven flow distribution. However, as in this conventional example, the insertion member 26 reduces the flow passage cross-sectional area inside the refrigerant flow diverter to increase the flow velocity of the refrigerant R, thereby agitating the gas and liquid to enable uniform flow distribution to the heat transfer tubes 24. ing. Further, although the flow velocity is originally reduced in the upper portion of the refrigerant flow divider due to the influence of gravity, the cross-sectional area of the insertion member 26 is gradually changed to reduce the flow passage cross-sectional area in the upper portion as in the conventional example, so that the refrigerant flow divider upper and lower sides are reduced. It is possible to realize a homogeneous state of the refrigerant R with a small difference in the refrigerant flow velocities and to maintain a more uniform split state.

[0008]

However, in the above-mentioned structure, the insertion member 2 requires precise drilling for inserting the tip of the heat transfer tube 24 into the insertion member 26.
There are problems that 6 itself becomes expensive and that many man-hours are required to pass the heat transfer tube 24 through the hole of the insertion member 26.

In view of the above problems, the present invention increases the flow velocity of the refrigerant R by reducing the flow passage cross-sectional area in the refrigerant shunt with a simple structure, and the flow passage cross-sectional area above the refrigerant shunt is lower. (EN) Provided is a refrigerant shunt that can be made smaller, is inexpensive, and can maintain a uniform shunt state.

[0010]

In order to solve the above-mentioned problems, a refrigerant distributor of the present invention seals a cylindrical pipe having a plurality of outlet pipe connection ports in the longitudinal direction and both ends of the cylindrical pipe. The partition plate, the lower end partition plate or the inflow pipe connected to the lower part of the cylindrical pipe, and the inner surface of the cylindrical pipe inserted into the surface opposite to the heat transfer pipe connection port, and the cross-sectional area gradually increases as the distance from the inflow pipe position increases. It is provided with a structure of an insertion member.

Further, the refrigerant flow distributor of the present invention has a plurality of outlet pipe connection ports in the longitudinal direction, and further has a crushed amount on the surface opposite to the outlet pipe connection port that gradually increases as the distance from the inlet pipe position increases. It comprises a cylindrical tube having a portion, a partition plate for sealing both ends of the cylindrical tube, and an inflow pipe connected to the lower end partition plate or the lower portion of the cylindrical tube.

[0012]

According to the present invention, with the above-described structure, the flow passage cross-sectional area in the refrigerant flow divider is reduced without using an insert member that requires complicated processing and complicated attachment work, and the flow passage cutoff at the upper portion of the refrigerant flow divider is performed. By making the area smaller than that of the lower portion, the refrigerant state inside the refrigerant distributor can be homogenized, and uniform distribution can be made to each heat transfer tube.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a refrigerant flow divider in one embodiment of the first invention. In FIG. 1, reference numeral 1 denotes a cylindrical tube having a plurality of heat transfer tube connection ports 2 provided in the longitudinal direction, both ends of which are sealed by tube end sealing partition plates 3a and 3b. A heat transfer tube 4 is connected to the heat transfer tube connection port 2 of the cylindrical tube 1. Reference numeral 5 is a refrigerant inflow pipe connected to a hole provided in the partition plate 3b at the lower end. Reference numeral 6 denotes an insertion member inserted inside the cylindrical tube 1 on the non-insertion side of the heat transfer tube 4, that is, on the surface opposite to the heat transfer tube connection port 2. As shown in FIG. 2, the insertion member 6 only cuts a cylinder obliquely, and has a cross-sectional area gradually increasing in the longitudinal direction.

The operation of the refrigerant flow divider configured as described above will be described. In the present embodiment, the flow velocity of the refrigerant is increased by inserting the insertion member 6 and reducing the flow passage cross-sectional area inside the refrigerant shunt, so that the gas and liquid of the refrigerant two-phase flow are agitated to each heat transfer tube. It allows shunting. Further, although the flow velocity is originally reduced at the upper portion of the refrigerant flow divider due to the influence of gravity, the flow passage cross-sectional area becomes smaller toward the upper portion by gradually changing the cross-sectional area of the insertion member 6, and the difference in the refrigerant flow velocity between the upper and lower sides of the refrigerant flow divider is reduced. A small and homogeneous state can be realized, and a more even shunt state can be maintained. These have the same effects as the conventional example.

As described above, according to this embodiment, the cylindrical tube 1 having a plurality of outlet pipe connection ports 2 in the longitudinal direction, and the cylindrical tube 1
Partition plates 3a and 3b for sealing both ends of the lower end partition plate 3b
A refrigerant shunt is composed of an inflow pipe 5 connected to the inlet pipe 5 and an insertion member 6 inserted into the opposite surface of the heat transfer pipe connection port 2 inside the cylindrical pipe 1 and having a cross-sectional area that gradually increases with distance from the position of the inflow pipe 5. By this, it is possible to realize a uniform shunt state with inexpensive and simple specifications.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a perspective view of a refrigerant flow divider in another embodiment, and FIG. 4 is a sectional view of FIG. In the figure, 11 is a cylindrical tube provided with a plurality of heat transfer tube connection ports 12 in the longitudinal direction, and has a press portion 18 in the upper part in which the crushed area of the tube is gradually increased as it moves away from the position of the inflow tube. In the press portion 18, the press crimp portion is joined with a brazing material in order to secure pressure resistance. Further, pipe end sealing partition plates 13a and 13b are attached to both ends of the cylindrical pipe 11.
A heat transfer tube 14 is connected to the heat transfer tube connection port 12 of the cylindrical tube 11. Reference numeral 15 is a refrigerant inflow pipe connected to a hole provided in the partition plate 3b at the lower end.

The operation of the refrigerant shunt configured as described above is the same as in the conventional example and the above-described embodiment. The flow velocity increases and gas-liquid is agitated.Furthermore, the flow passage cross-sectional area is made smaller in the upper part of the refrigerant flow divider to suppress the difference in flow velocity between the upper and lower parts due to the effect of gravity, and to reduce the refrigerant inside the refrigerant flow divider. It is possible to maintain a homogeneous state and obtain a uniform shunt state.

As described above, according to this embodiment, a plurality of outlet pipe connecting ports 12 are provided in the longitudinal direction, and the crushed amount of the pipe is gradually increased on the opposite surface of the outlet pipe connecting port 12 from the inlet pipe 15. A cylindrical tube 11 having an enlarged press portion 18,
Partition plates 13a and 13b for sealing both ends of the cylindrical tube 11,
With the configuration including the inflow pipe 15 connected to the lower end partition plate 13a, it is possible to realize a uniform distribution state at low cost and with simple specifications.

In both of the above-described two embodiments, the multi-hole heat transfer tube was used as the heat exchanger specification, but it is needless to say that the same effect can be obtained with a fin & tube type heat exchanger using a round tube. Nor.

[0020]

As described above, according to the present invention, a cylindrical pipe having a plurality of outlet pipe connection ports in the longitudinal direction, a partition plate for sealing both ends of the cylindrical pipe, the lower end partition plate or the lower part of the cylindrical pipe. By configuring the refrigerant flow divider from an inflow pipe connected to, and inserted into the surface opposite to the heat transfer pipe connection port inside the cylindrical pipe, the cross-sectional area of which gradually increases with increasing distance from the inflow pipe position. It is possible to realize a uniform shunt state with inexpensive and simple specifications.

Further, according to the present invention, there is provided a press portion having a plurality of outlet pipe connecting ports in the longitudinal direction and further having a crushed amount of the pipe gradually increased with distance from the inlet pipe position on the surface opposite to the outlet pipe connecting port. With a cylindrical tube having a partition plate that seals both ends of the cylindrical tube, and an inflow tube connected to the lower end partition plate or the lower portion of the cylindrical tube, a uniform diversion state can be obtained at low cost and with simple specifications. It can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerant flow divider according to an embodiment of the present invention.

FIG. 2 is a perspective view of an insertion member according to an embodiment of the present invention.

FIG. 3 is a perspective view of a refrigerant flow divider according to another embodiment of the present invention.

FIG. 4 is a sectional view of the refrigerant flow divider in FIG.

FIG. 5 is a perspective view of a conventional refrigerant flow divider.

FIG. 6 is a sectional view of a conventional refrigerant flow divider.

FIG. 7 is a perspective view of a conventional insertion member.

FIG. 8 is a front view of a heat exchanger using a conventional refrigerant flow divider.

[Explanation of symbols]

 1, 11 Cylindrical tube 2, 12 Heat transfer tube connection port 3a, 3b, 13a, 13b Partition plate 4, 14 Heat transfer tube 5, 15 Inflow tube 6 Insert member 18 Press section

Claims (2)

[Claims] 1. A cylindrical pipe having a plurality of outlet pipe connection ports in a longitudinal direction, partition plates for sealing both ends of the cylindrical pipe, and an inflow pipe connected to the lower end partition plate or the lower part of the cylindrical pipe. Inserted on the opposite surface of the heat transfer tube connection port inside the cylindrical tube,
A refrigerant flow divider comprising an insertion member whose cross-sectional area gradually increases with distance from the inflow pipe position. 2. A cylindrical pipe having a plurality of outlet pipe connecting ports in the longitudinal direction, and further having a press portion on the surface opposite to the outlet pipe connecting port, in which the crushed amount of the pipe is gradually increased as the distance from the inlet pipe position increases. A refrigerant distributor comprising a partition plate for sealing both ends of the cylindrical pipe and an inflow pipe connected to the lower end partition plate or the lower part of the cylindrical pipe.