JPH0737865B2 - Shunt - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shunt air which is mainly used in an air conditioner or the like and which evenly distributes a gas-liquid two-phase refrigerant.

When the evaporator that constitutes a refrigeration cycle is small, the internal resistance of the refrigerant is small and the refrigerant passage may have only one flow path, but when it is large, the total flow rate of the refrigerant increases and Since the resistance in the pipe becomes large in the passage, it is necessary to use multiple flow passages and a uniform flow divider that can maximize the capacity of the evaporator.

The conventional flow divider will be described below with reference to FIGS. 6 to 9.

FIG. 6 is a front view of a flow divider and an evaporator using the flow divider, FIG. 7 is a perspective view of the flow divider, and FIGS. 8 and 9 are sectional views of a conventional flow divider.

In FIG. 6, 1 is an inlet side flow divider, 2 is an outlet side flow divider,
3 is a heat transfer tube, 4 is a fin, 5 is an inflow tube, and 6 is an outflow tube. FIG. 7 is a perspective view of the inlet-side flow divider 1. Sixth
In the figure, the refrigerant in the gas-liquid two-phase state flows from the A side into the inlet side flow divider 1 via the inflow pipe 5, passes through a plurality of heat transfer pipes 3 and joins at the outlet side flow divider 2, and then from the outflow pipe 6 to E Spill to the side. Next, the inside of a very general conventional flow divider will be described with reference to FIG. δ represents the variation in the length of the insertion portion of the heat transfer tube into the flow divider. This amount δ is unavoidable in the assembly process and has a great influence on the balance of the diversion.

Therefore, a conventional example for regulating this amount δ is shown in FIG. In FIG. 9, 3 is a heat transfer tube, 5 is an inflow tube, 8 is a heat transfer tube tip taper portion, and 9 is a cylindrical container as a header. In order to restrict δ shown in FIG. 8 to be small, the tip of the heat transfer tube is tapered, and δ is restricted by the intersection of the tapers 8 and the holes in the container 9.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the above configuration has the following problems.

(1) It is difficult to control the machining accuracy of the taper, and the insertion amount varies depending on the accuracy.

(2) It takes a lot of time to process.

(3) Lack of assembly workability during mass production.

Means for Solving the Problems In order to solve the above problems, the present invention inserts a substantially semi-cylindrical member inside the flow distributor, and regulates the length of the insertion portion of the heat transfer tube to divide the heat flow evenly.

Effect The present invention can easily regulate the length of the insertion portion of the heat transfer tube in the container, and can evenly divide the refrigerant by optimizing the shape of the space inside the container.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, a first embodiment will be described with reference to FIG.

In the figure, 1 is an inlet side flow divider, 3 is a heat transfer tube, 5 is an inflow tube, and 7 is a semi-cylindrical insertion member. Although the inlet side flow divider is shown here, the outlet side flow divider has the same shape. Further, the connection of the inflow pipe 5 is also the lower end of the flow divider, but it may be on the side face.

According to the above configuration, the refrigerant flowing in from the A side passes through the inflow pipe 5, flows into the inlet side flow divider 1 (B), is then divided into a plurality of heat transfer pipes 3, and is guided to the evaporator side (C). Get burned. In this case, even if there is some variation in the insertion length of the heat transfer tubes into the flow distributor, they can be easily aligned by the semi-cylindrical insertion member 7, and the insertion length of the heat transfer tubes into the flow distributor can be increased. It is possible to improve the non-uniform shunt state due to the variation of.

Next, another embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 shows an inlet-side flow divider, in which 1 is an inlet-side flow divider, 3 is a heat transfer tube, and 7a is an inlet-side insertion member.
Further, FIG. 3 shows an outlet side flow divider, 2 is an outlet side flow divider,
3 is a heat transfer pipe, 6 is an outflow pipe, and 7b is an outlet side insertion member.

According to the above configuration, the refrigerant flowing in the gas-liquid two-phase state from the A side in FIG. 2 passes through the inflow pipe 5, flows into the inlet side flow divider 1 (B), and then is divided into a plurality of heat transfer pipes 3. And is guided to the evaporator side (C). The refrigerant absorbs heat in the evaporator, flows into the outlet side flow divider as shown in FIG. 3 from the C side in the vapor phase state, merges in the outlet side flow divider 2 (D), and then flows out from the outlet pipe 6 to E. Be guided to the side. Generally, the volume velocity is low in the inlet side flow divider 1 having a low degree of dryness, and the gas phase and the liquid phase are vertically separated due to the influence of gravity, but the liquid passage cross-sectional area in the flow divider (B) is separated by the insertion member 7a. The volume velocity can be increased by decreasing, and the gas-liquid can be evenly divided by stirring. Further, the volumetric velocity is very high in the outlet-side flow divider (2) having a high degree of dryness because it is in a gas phase state. Therefore, the outlet side insertion member 7b is made smaller than the inlet side insertion member 7a to suppress the pressure loss in the flow divider. In this way, by making the inlet side insertion member larger than the outlet side member according to the dryness, pressure loss can be suppressed and the flow can be evenly divided.

Next, another embodiment will be described with reference to FIG. FIG. 4 shows an inlet-side flow divider, in which 1 is an inlet-side flow divider, 3 is a heat transfer tube, and 7c is an inlet-side insertion member.

According to the above configuration, the refrigerant flowing in the gas-liquid two-phase state from the A side in FIG. 4 passes through the inflow pipe 5, flows into the inlet side flow divider 1 (B), and then is divided into a plurality of heat transfer pipes 3. And is guided to the evaporator side (C). Generally, the volume velocity is low in the inlet-side flow divider 1 having a low degree of dryness, and the gas phase and the liquid phase are vertically separated due to the influence of gravity, but the flow path in the flow divider (B) is separated by the inlet-side insertion member 7c. By decreasing the cross-sectional area toward the top, the volume velocity increases relatively evenly, and the gas-liquid can be agitated while suppressing the pressure loss, and the flow can be evenly split. As described above, the insertion member is made smaller toward the inlet side in the vicinity of the inflow pipe in accordance with the volume velocity in the flow divider to suppress the pressure loss, and the variation δ in the insertion amount can be regulated, so that the flow can be evenly divided.

Next, another embodiment will be described with reference to FIG. FIG. 5 shows an outlet side flow divider, 2 is an outlet side flow divider, 3 is a heat transfer tube, 6 is an outflow tube, and 7d is an outlet side insertion member.

According to the above configuration, in FIG. 5, the refrigerant absorbs heat in the evaporator, flows into the outlet side flow divider 2 from the C side in the vapor phase state, merges in the outlet side flow divider 2 (D), and then flows out. It is guided from the pipe 6 to the E side. In the outlet-side flow divider 2 (D) having a high degree of dryness, the volume velocity is very high because it is in a vapor phase state. Also, although it is as fast as the above, there are few confluent channels in the lower portion of the outlet-side flow divider, and the volume velocity is small. It may cause accumulation. Therefore, by increasing the flow passage cross-sectional area in the flow divider (D) toward the upper part by the outlet side insertion member 7d, the volume velocity increases relatively evenly, pressure loss is suppressed, liquid pool is prevented from occurring, and the insertion amount is increased. It is possible to regulate the variation δ of the above and to divide the flow evenly.
As described above, the insertion member is made smaller nearer to the outflow pipe on the outlet side according to the volume velocity in the flow divider, so that pressure loss can be suppressed, the variation δ in the insertion amount can be regulated, and the flow can be evenly divided.

EFFECTS OF THE INVENTION As described above, according to the present invention, the length of the insertion portion of the heat transfer tube in the container can be easily regulated, and the shape of the space inside the container can be optimized to evenly distribute the refrigerant. The flow can be divided, and the workability of assembly is good.

[Brief description of drawings]

FIG. 1 is a sectional view of an inlet-side flow divider of the first embodiment and a heat transfer tube connected thereto, and FIG. 2 is a sectional view of an inlet-side flow divider of the second embodiment and a heat transfer tube connected thereto. FIG. 3 is a sectional view of an outlet-side flow divider of the second embodiment and a heat transfer tube connected to it, and FIG. 4 is a sectional view of an inlet-side flow divider of the third embodiment and a heat transfer tube connected to it. FIG. 5 is a sectional view of the outlet side flow divider of the fourth embodiment and a heat transfer tube connected to the outlet side flow divider, FIG. 6 is a front view showing a state in which the flow divider is attached to an evaporator, and FIG. 7 is a conventional flow divider. FIG. 8 is a sectional view of the conventional flow divider, and FIG. 9 is an enlarged sectional view of the conventional flow divider. 1 ... inlet side flow divider, 2 ... outlet side flow divider, 3 ... heat transfer tube, 5 ... inlet tube, 6 ... inlet tube, 7a, 7c ... inlet side insertion member, 7b, 7d ... outlet Side insertion member.

Front page continuation (72) Inventor Ryo Aoki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Hiroaki Kase 3-22 Takada Hon-dori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. 56) References JP-A-63-220054 (JP, A)

Claims (4)

[Claims] 1. A container for collectively connecting the heat transfer tubes of an evaporator having a plurality of heat transfer tubes through which a refrigerant passes, and a tip portion of the heat transfer tubes inserted into the container and inserted into the container. A flow divider comprising a substantially semi-cylindrical insertion member. 2. The flow diverter according to claim 1, wherein the insert member is a member having a smaller cross-sectional area on the refrigerant outflow side of the evaporator than on the refrigerant outflow side of the evaporator. 3. The insert member is constituted by a member that becomes smaller as it gets away from the position of the inflow pipe connected to the container.
The shunt described. 4. The flow diverter according to claim 1, wherein the insertion member is a member that increases in size with increasing distance from the position of the outflow pipe connected to the container.