JPH085198A - Air conditioning heat exchanger - Google Patents

Abstract

PURPOSE:To improve the condensing heat transfer due to the separation and the removal of condensing liquid refrigerant and to improve the condensing performance by branching refrigerant fed to an inlet side header to many heat transfer tubes, partly condensing it, then separating it to gas refrigerant and liquid refrigerant by a first intermediate header, and heat exchanging in this state. CONSTITUTION:Superheated vapor refrigerant fed to an inlet header 1 is gradually liquefied while passing heat transfer tubes 21 from its outlet hole 10, and fed to a first intermediate header 2. The gas refrigerant having low density is passed through a connecting pipe 13 from the outlet hole, and fed from the inlet hole of a second intermediate header 3. The refrigerant separated to liquid and vapor in the header 2, the liquefied refrigerant is not supplied to the part between the intermediate headers 3 and 4. Accordingly, since it is again cooled in the state of liquefied superheated vapor refrigerant less cooled n heat transfer tubes 22, 23, its cooling efficiency can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to reduce the cost of an air conditioner heat exchanger for a gas heat pump by improving the condensing performance of the refrigerant so as to make the air conditioner heat exchanger compact. is there.

[0002]

2. Description of the Related Art Conventionally, a technology relating to an aluminum refrigerant condenser for a car cooler has been publicly known. For example, it is like the technique described in Japanese Patent Publication No. 3-45300.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a heat exchanger for air conditioning of a gas heat pump for separating and condensing condensed liquid refrigerant.
By improving the condensing heat transfer through removal, the condensing performance is improved, and the air conditioning heat exchanger is made compact and the cost is reduced. In addition, in the heat exchanger of the gas heat pump, the temperature rise of the heat transfer pipes and fins due to the overheated gas refrigerant is prevented from shifting to another row, and the temperature difference with the air is increased to improve the efficiency of the heat exchanger. Then
The aim is to realize a compact and low-cost air conditioning heat exchanger.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In claim 1, a plurality of intermediate headers are provided between the inlet header into which the refrigerant flows and the outlet portion from which the refrigerant flows out, and the fin group is passed between these headers. In an air-conditioning heat exchanger in which a large number of heat transfer tubes are connected, the refrigerant that has flowed into the inlet header is branched into a large number of heat transfer tubes and partially condensed, and then the first intermediate header is used to cool the gas refrigerant and liquid. It is separated into a refrigerant, and the gas refrigerant and the liquid refrigerant are heat-exchanged in a separated state.

According to a second aspect of the present invention, in the heat exchanger for air conditioning, a gap is provided between the fins on the inlet side at the time of condensation and other fins.

[0006]

Next, the operation will be described. According to claim 1, a plurality of intermediate headers are provided between the inlet header into which the refrigerant flows and the outlet portion from which the refrigerant flows out, and the fin group is passed between these headers. In a heat exchanger for air conditioning in which a large number of heat transfer tubes are connected, the refrigerant that has flowed into the inlet-side header is branched into a large number of heat transfer tubes and partially condensed, and then, in the first intermediate header, as a gaseous refrigerant. Separated into liquid refrigerant, because it was configured to heat exchange the gas refrigerant and liquid refrigerant in a separated state, part of the liquefied refrigerant adheres to the inside of the heat transfer tube, the superheated vapor refrigerant in the heat transfer tube. There is no obstruction to cooling, and it has become possible to perform the most efficient cooling of refrigerant with the minimum number of heat transfer tubes.

According to the second aspect of the present invention, in the air-conditioning heat exchanger, a gap is provided between the fins on the inlet side at the time of condensation and the fins on the other side. The temperature of the fin group 26 becomes higher than that of the fin group 27 by providing the space. That is, the temperature difference from the air becomes large. As a result, the efficiency of the heat exchanger for air conditioning could be improved.

[0008]

EXAMPLES Next, examples will be described. 1 is a bird's-eye view showing the entire heat exchanger for air conditioning of the present invention, FIG. 2 is a front view showing the heat exchanger for air conditioning of the present invention, and FIG. 3 is a front view showing a state in which a heat transfer tube 21 is removed. 4, FIG. 4 is an overall plan view of the air conditioning heat exchanger, FIG. 5 is a front view of an inlet header 1 and an intermediate header 2 of the air conditioning heat exchanger of the present invention, and FIG. 6 is an intermediate header 3.
・ Front view of 5 ・ 7 ・ 9 part, Fig. 7 shows intermediate headers 4 ・ 6
8 is a front view of the portion 8 and FIG. 8 shows an inlet header 1, an intermediate header 2, an intermediate header 3, 5, 7, 9 and an intermediate header 4, 6, 8.
9 is a side view of the U-shaped connecting pipes 24 and 25, FIG. 10 is a cross-sectional view of the heat transfer pipe portion, and FIG.
U-shaped connecting pipes 24 and 25, inlet header 1 and intermediate header 4
・ A plan view of 6.8 and the portion of the connecting pipe 13, FIG.
It is a plan view showing an embodiment in which a gap is provided between the fins on the inlet side and the other rows at the time of condensation.

1, FIG. 2, FIG. 3, and FIG. 4, in the heat exchanger portion for air conditioning of the gas heat pump, the fin group A
, A heat transfer tube and a header are disclosed. When used as an air conditioner, the superheated steam refrigerant is supplied from the inlet header 1 and is cooled while the superheated steam cooling passes through the heat transfer tubes in the fin group A and goes out from the outlet hole 20c. Of. In this case, the cooling air drawn by the cooling fan F cools the heat transfer tube while passing through the fin group A, and liquefies the superheated vapor refrigerant passing inside the heat transfer tube.

However, when the outer surface of the heat transfer tube is cooled, the exposed droplets adhere to the front end of the peripheral surface of the inner wall of the heat transfer tube, so that the cooling efficiency of the peripheral edge of the tube to which the droplets adhere is reduced. Of. Therefore, it is possible to improve the condensation heat transfer efficiency by separating the exposed droplets and the superheated vapor refrigerant separately,
Also, the condenser can be made compact.

Therefore, according to the present invention, at the time of condensation used as an air conditioner, the refrigerant flowing into the inlet header 1 is branched from the inlet header 1 into a large number of heat transfer tubes 21 and a part thereof is condensed, The liquid refrigerant and the gas refrigerant are separated by the intermediate header 2, the gas refrigerant flows into the header in the second row front stage, and the liquid refrigerant flows into the second row header or the headers after the second row. Moreover, as you go from the first row to the second row of the second row,
The number of heat transfer tubes connected between the headers is gradually decreasing.

In the drawings, reference numeral 1 denotes an inlet header into which superheated vapor refrigerant flows at the time of condensation, and 2 to 9 denote a plurality of intermediate headers arranged at each stage of the condensation process. The inlet header 1 is provided with 14 outlet holes 10 for branching the inflowing refrigerant in 14 directions. First intermediate header 2
Are arranged parallel to each other on the side of the inlet header 1, and 14 inlet holes 10a corresponding to the outlet holes 10 of the inlet header 1 are provided.
And outlet holes 11 and 12 at the upper and lower ends of the header
Is formed.

The second intermediate header 3 is arranged parallel to the side of the intermediate header 2 and has a connecting pipe 13 extending from the intermediate header 2.
An inlet hole 11a corresponding to the outlet hole 11 is opened. Further, seven outlet holes 15 are formed. Further, the outlet hole 11 of the intermediate header 2 and the inlet hole 11 of the intermediate header 3
It is connected to a by a connection pipe 13. The third intermediate header 4 is arranged parallel to the side of the intermediate header 3 and
Corresponding to the exit holes 15 of the intermediate header 3, seven entrance holes 15a and six exit holes 16 which are one fewer than the entrance holes 15a are formed, and further an entrance hole 12a is formed on the lower side surface of the header. The inlet hole 12 a and the outlet hole 12 of the first intermediate header 2 are connected by a connection pipe 14.

The fourth intermediate header 5 is arranged immediately below the intermediate header 3 and corresponds to the outlet hole 16 of the intermediate header 6.
It is formed of five inlet holes 16a and five outlet holes 17 which are one less than that. The fifth intermediate header 6 is arranged immediately below the intermediate header 4, and the outlet hole 1 of the intermediate header 5 is provided.
It is formed from five inlet holes 17a corresponding to No. 7 and four outlet holes 18 which are one less than that. The sixth intermediate header 7 is arranged immediately below the intermediate header 5 and is formed of four inlet holes 18a corresponding to the outlet holes 18 of the intermediate header 6 and three outlet holes 19 that are one less than that. There is.

The seventh intermediate header 8 is arranged immediately below the intermediate header 6 and has three inlet holes 19a corresponding to the outlet holes 19 of the intermediate header 7 and also three outlet holes 20. There is. The eighth intermediate header 9 is arranged immediately below the intermediate header 7 and has three inlet holes 20a corresponding to the outlet holes 20 of the intermediate header 8 and one outlet hole 20c at the lower end of the header of the intermediate header 9. To form.

As shown in the figure, the heat transfer tube 21 is connected to the first intermediate header 2 by connecting one end sides of two linear portions parallel to each other in the longitudinal direction with a U-shaped connecting tube 24. The remaining ends of the heat transfer tubes 22 are connected to the intermediate headers 3, 5, 7, and 9, and the remaining ends of the heat transfer tubes 23 are connected to the intermediate headers 4, 6, and 8. A large number of fin groups are arranged between the straight portions of the heat transfer tubes 21, 22, 23.

In the above structure, the superheated steam refrigerant flowing into the inlet header 1 is gradually liquefied from the 14 outlet holes 10 thereof while passing through the 14 heat transfer tubes 21. Together with this, the first intermediate header 2 enters from the outlet side of the heat transfer tube 21. Here, the low-density gas refrigerant passes through the connection pipe 13 from the outlet hole 11 at the upper end of the header,
It flows in through the inlet hole 11a of the second intermediate header 3.

The refrigerant discharged from the seven outlet holes 15 passes through the seven heat transfer tubes 22, the U-shaped connecting tube 25, and the heat transfer tube 23, respectively, and flows into the third intermediate header 4. Further, the highly dense liquefied refrigerant of the first intermediate header 2 exits from the outlet hole 12, passes through the connection pipe 14, and flows in from the lower side surface inlet hole 12 a of the intermediate header 4. These refrigerants are 6
From the outlet holes 16 of the heat transfer pipe 23, the U-shaped connecting pipe 25,
After passing through the heat transfer tube 22, the inlet hole 16 is formed in the fourth intermediate header 5.
Inflow from a. From the intermediate header 5 to the outlet hole 17, the heat transfer pipe 22, the U-shaped connecting pipe 25, and the heat transfer pipe 23 are introduced, and the inlet hole 17a enters the intermediate header 6. Next, from the outlet hole 18 of the intermediate header 6, through the heat transfer pipe 23, the U-shaped connecting pipe 25, and the heat transfer pipe 22, the inlet hole 18a of the intermediate header 7
Then, the intermediate header 7 is entered. From the intermediate header 7 through the outlet hole 19, the heat transfer tube 22, the U-shaped connecting tube 25, and the heat transfer tube 2
3 enters the intermediate header 8 through the inlet hole 19a. The heat transfer pipe 23, the U-shaped connecting pipe 25, and the heat transfer pipe 22 from the intermediate header 8 through the outlet hole 20 to the inlet hole 2 of the intermediate header 9.
0a, and finally the outlet hole 20c below the intermediate header 9
Get out of.

As described above, the heat transfer tube 21 is introduced from the inlet header 1.
In the portion of the intermediate header 2, the portion where the superheated vapor refrigerant is liquefied first while passing through the inside is separated into liquid and vapor. As a result, the liquefied refrigerant is not supplied to the intermediate header 3 and the intermediate header 4,
Since the heat transfer tubes 22 and 23 can be cooled again in the state of the liquefied superheated vapor refrigerant with less cooling, the cooling efficiency can be improved.

Further, between the first inlet header 1 and the intermediate header 2, part of the superheated vapor refrigerant is liquefied, and the volume of the superheated vapor refrigerant is reduced. Also, the intermediate header 2
From the intermediate header 3 to the intermediate header 3, the volume of the liquefied superheated vapor refrigerant is reduced, and the intermediate header 3 to the intermediate header 4, the intermediate header 4 to the intermediate header 5, the intermediate header 5 to the intermediate header 6, and the intermediate header 6 to the intermediate header 3. Since the volumes of the header 7, the intermediate header 7 to the intermediate header 8 and the intermediate header 8 to the final header 9 are gradually reduced, the outlet holes and the inlet holes are gradually reduced in the present invention, and the heat transfer tube to be used is It is decreasing one by one.

With the above configuration, the minimum distance of heat transfer pipes is used in the downstream side where the amount of superheated steam refrigerant is reduced, and unnecessary heat transfer pipes are not used. Therefore, the fin group A and the heat transfer tube can be used in the state of the highest efficiency. As a result, the heat exchanger for air conditioning can be made compact and the cost can be kept low.

Next, the technique shown in FIG. 12 will be described.
With respect to the flow direction of the refrigerant at the time of condensation, in the air conditioner heat exchanger in which the number of heat transfer tubes connected between the headers is gradually reduced from the front stage to the rear stage of the flow direction,
A gap is provided between the fins of the first row, that is, the inlet side at the time of condensation and the other rows. And at this time, the air is 3
You must flow from the first row to the first row.

Conventionally, as described above, no gap is provided between the fins in the first row and the fins in the other row. Therefore, conventionally, the temperature of the air flowing in orthogonal to the rear row of the heat exchanger rises every time it passes through the row, the temperature difference between the air and the refrigerant becomes small, and the efficiency decreases. In the present invention, the temperature rise of the heat transfer tubes and fins due to the superheated gas refrigerant is prevented from shifting to another row, and the temperature difference from the air is increased to improve the efficiency of the heat exchanger and to improve the condensation performance. By making improvements, it is possible to make the heat exchanger for air conditioning compact and reduce its cost.

The flow of the refrigerant has a gap K between the fin group 26 disposed between the straight portions of the heat transfer tube 21 and the fin group 27 disposed between the straight portions of the heat transfer tubes 22 and 23. It is provided. The outside air flows in perpendicularly to the heat transfer tube 23 from the inlet of the fin group 27. The heat emitted from the refrigerant flowing inside the heat transfer tubes 23 and 22 is
It passes through 2 and moves to the fin group 27. The air flowing into the fin group 27 takes heat from the fin group 27, and the temperature of itself gradually rises.

The air exiting the fin group 27 immediately flows into the fin group 26. High-temperature refrigerant flows from the heat transfer tubes 22 and 23 inside the heat transfer tube 21 arranged in the fin group 26. Therefore, by providing a gap between the fin group 27 and the fin group 26, the temperature of the fin group 26 becomes higher than that of the fin group 27. That is, the temperature difference from the air becomes large. This improves the efficiency of the air conditioning heat exchanger.

[0026]

Since the present invention is constructed as described above, it has the following effects. As in claim 1, a plurality of intermediate headers are provided between the inlet header into which the refrigerant flows and the outlet portion from which the refrigerant flows out, and the fin group is passed between these headers. In an air-conditioning heat exchanger in which a large number of heat transfer tubes are connected, the refrigerant that has flowed into the inlet header is branched into a large number of heat transfer tubes and partially condensed, and then the first intermediate header is used to cool the gas refrigerant and liquid. Since it is configured to separate into a refrigerant and exchange heat between the gas refrigerant and the liquid refrigerant in a separated state, a part of the liquefied refrigerant adheres to the inside of the heat transfer tube and hinders the cooling of the superheated vapor refrigerant. It became possible to cool the refrigerant with the highest efficiency by using the minimum number of heat transfer tubes.

In the heat exchanger for air conditioning according to the second aspect, since a gap is provided between the fins on the inlet side at the time of condensation and the other lines, the fin group 27 and the fin group 26 are provided. The temperature of the fin group 26 becomes higher than that of the fin group 27 by providing the voids. That is, the temperature difference from the air becomes large. As a result, the efficiency of the heat exchanger for air conditioning could be improved.

[Brief description of drawings]

FIG. 1 is an overhead view showing the entire heat exchanger for air conditioning of the present invention.

FIG. 2 is a front view showing an air conditioning heat exchanger of the present invention.

FIG. 3 is a front view of a state in which a heat transfer tube 21 is removed.

FIG. 4 is an overall plan view of a heat exchanger for air conditioning.

FIG. 5 is a front view of the inlet header 1 and the intermediate header 2 of the air conditioning heat exchanger of the present invention.

FIG. 6 is a front view of a portion of intermediate headers 3, 5, 7, and 9.

FIG. 7 is a front view of a portion of an intermediate header 4.6.8.

FIG. 8: Entrance header 1, intermediate header 2, intermediate header 3
The side view of the part of 5.7.9 and the intermediate header 4.6.8.

FIG. 9 is a side view of a portion of U-shaped connecting pipes 24 and 25.

FIG. 10 is a sectional view of a portion of the heat transfer tube.

FIG. 11 is a plan view of U-shaped connecting pipes 24 and 25, an inlet header 1, an intermediate header 4.6.8 and a connecting pipe 13.

FIG. 12 is a plan view showing an example in which a gap is provided between the fins on the inlet side at the time of condensation and the other lines.

[Explanation of symbols]

 A fin group 1 inlet header 2 first intermediate header 3 second intermediate header 13 connection pipe 14 connection pipe 24 U-shaped connection pipe 26, 27 fin group

Claims (2)

[Claims] 1. A plurality of intermediate headers are provided between an inlet header into which a refrigerant flows and an outlet portion from which a refrigerant also flows, and a plurality of fins are passed between these headers so that a large number of fin headers are provided. In the air conditioning heat exchanger in which the heat transfer tubes are connected, the refrigerant flowing into the inlet side header is branched into a large number of heat transfer tubes and partially condensed, and then the first intermediate header is used to cool the gas refrigerant and the liquid refrigerant. A heat exchanger for air-conditioning, characterized in that heat is exchanged between the gas refrigerant and the liquid refrigerant in a separated state. 2. The heat exchanger for air conditioning according to claim 1, wherein a gap is provided between the fins on the inlet side at the time of condensation and the other rows.