JPH0596773U - Heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the passage resistance of heat exchange fluid and suppress its circulation power. [Structure] A pair of header pipes 2 and 3 that divide the interior into a plurality are provided, and a plurality of tubes 5 having inner fins 13 inserted therein and heat radiation fins 6 are laminated between the header pipes 2 and 3. The core 4 is arranged. Above core 4
Is partitioned by a plurality of paths A, B, C formed by a plurality of tubes 5 that move the heat exchange fluid in the same direction, and the heat exchange fluid is meandered between the header pipes 2, 3. Each path A, B,
The passage widths PA, PB, PC of the heat exchange fluid of the inner fin 13 inserted in the tube 5 of C are formed to be the same, and the passage widths PA, PB, PC are at least upstream and downstream of the heat exchange fluid in the core 4. The paths A and C located on the side are made different. Then, the passage width PC of the inner fin 13 of the path C located on the downstream side is formed wider than the A passage width PA of the upstream path.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger capable of reducing passage resistance of a heat exchange fluid and suppressing power for circulation thereof.

[0002]

[Prior Art]

 Some condensers installed in vehicle air-conditioning systems are provided with a pair of left and right header pipes whose interiors are partitioned by partition plates, as disclosed in Japanese Utility Model Laid-Open Nos. 2-289800 and 2-93668. Arrange a condenser core in which multiple tubes and heat radiation fins are stacked, insert an inner fin inside the tube, and let the high-temperature and high-pressure refrigerant gas sent from the compressor meander downward along the tube and move it. There is one that heat-exchanges in the process to gradually liquefy the refrigerant gas.

In a capacitor having such a structure, the state of the refrigerant varies depending on the progress of heat exchange, the refrigerant is in a gas phase state at the upper part of the capacitor core, and the heat exchange proceeds in the middle part to become a gas-liquid mixed state. And is completely liquefied at the bottom of the capacitor core. Therefore, in the tube in which the three types of refrigerant move, the amount of the liquid refrigerant increases toward the lower side of the condenser core, and the passage resistance tends to increase.

[0004]

[Problems to be solved by the device]

 However, the conventional tube has the same structure in each part of the condenser core and the same inner fin is used, so the problem of the passage resistance is not improved and the power of the compressor, which is the circulation power source of the refrigerant, is increased. There was a problem.

The present invention solves such a problem, and provides a heat exchanger capable of reducing the passage resistance of a heat exchange fluid without lowering the heat exchange capacity and reducing the circulating power of the heat exchange fluid. The purpose is to

[0006]

[Means for Solving the Problems]

 For this reason, the heat exchanger of the present invention is provided with a pair of header pipes whose interior is divided into a plurality of parts, and a plurality of tubes having inner fins inserted therein and heat radiation fins are laminated between the header pipes. In a heat exchanger in which the heat exchange fluid is arranged in a zigzag manner between the header pipes, and the heat exchange fluid is divided into a plurality of paths consisting of a plurality of tubes that move in the same direction. , The passage width of the heat exchange fluid of the inner fins inserted in the tubes of the respective passages is formed to be the same, and the passage width is made different at least in the paths located on the upstream and downstream sides of the heat exchange fluid in the core, and the downstream side The width of the inner fins of the path located at is wider than the width of the upstream path to reduce the passage resistance of the heat exchange fluid without decreasing the heat exchange capacity and to circulate the circulation. It is characterized in that so as to attained the small power of the force.

[0007]

[Action]

 The pitch of the inner fins inserted in the tube, that is, the passage width of the heat exchange fluid, is changed according to the progress of heat exchange of the heat exchange fluid. In the latter stage of heat exchange, the inner fin pitch is coarsened to reduce the passage resistance of the part, and a small amount of power for circulating the heat exchange fluid can be achieved.

[0008]

【Example】

 Hereinafter, a description will be given of an illustrated embodiment in which the present invention is applied to a condenser installed in a vehicle air conditioner. In FIGS. 1 to 3, reference numeral 1 is a heat exchanger, which is a pair of left and right header pipes 2. 3, a plurality of tubes 5 made of aluminum and constituting the core 4 and the heat radiation fins 6 are laminated between the header pipes 2 and 3.

The header pipes 2 and 3 are formed in a substantially elliptic tube shape, which is composed of, for example, an aluminum brazing sheet having one or both surfaces coated with a brazing material, and the sheet is formed into a substantially gutter shape to form the tank plates 2a and 3a. And end plates 2b and 3b are formed, and each pair of these is faced and fitted, and the joint portion is brazed.

The upper and lower ends of the header pipes 2 and 3 are closed by caps 7 and 8, and an inlet pipe 9 that communicates with a compressor (not shown) and an outlet pipe 10 that communicates with a receiver tank (not shown) near the caps 7 and 8. And are connected. The interiors of the header pipes 2 and 3 are partitioned by partition plates 11 and 12, which are located at the upper and lower positions of the core 4 and are formed by a plurality of tubes 5 that move the refrigerant in the same direction. The first pass A has the largest number of the tubes 5, and the second and third passes B and C are arranged in this order.

Of these, the first path A is composed of a plurality of tubes 5 positioned above the partition plate 11, and one ends of these tubes 5 communicate with the inlet pipe 9. The second pass B is located directly below the first pass A, which is composed of a plurality of tubes 5 located between the partition plates 11 and 12, and the third pass C is located at the bottom of the capacitor core 4. This is composed of a plurality of tubes 5 located below the partition plate 12, one end of which communicates with the outlet pipe 10.

The tubes 5 of the 1st to 3rd passes A, B and C are formed in the same shape, which is formed flat as shown in the drawing, and the inner portion of which the aluminum sheet is formed in a wavy shape with a smooth curve therein. The fins 13 are inserted in the tube axis direction and brazed.

The distance between the adjacent wave-shaped forming portions of the inner fin 13, that is, the fin pitch that is the passage width of the heat exchange fluid is different between the first to third passes A, B, and C. , PB, PC are formed such that PA <PB <PC as shown in FIG.

In addition, in the figure, 14 is an end plate disposed at the upper and lower ends of the core 4, 15 is a mounting leg projecting from the lower end of the header pipes 2, 3, and is a mounting hole (not shown) on the vehicle side. Can be inserted into.

4 and 5 show another embodiment of the present invention, in which the same reference numerals are used for the components corresponding to those of the above-described embodiment. In this embodiment, instead of forming the inner fin 13 into a sinusoidal shape with a smooth curve, the inner fin 13 is formed into a trapezoidal wave shape, and the shape is shifted by a predetermined length e with respect to the moving direction of the heat exchange fluid. It is characterized in that it is molded and promotes agitation of the heat exchange fluid to enhance heat exchange. The fin pitches PA, PB, PC in this case are formed as PA <PB <PC as shown in FIG.

In the above-described embodiment, the fin pitches PA, PB and PC are all set to PA <PB <PC, but the present invention is not limited to this example and, for example, PA = PB <PC. The heat exchange of paths A and B is promoted, or PB <PA <PC, so that the refrigerant exhibits a gas-liquid two-phase state and the heat exchange of the second path B where the heat exchange is best performed is further enhanced. The fin pitch PC of the third pass C, which is the final pass portion, may be set larger than the fin pitches PA and PB of the other passes A and B.

Further, although the capacitor core 4 is divided into three paths in the above-described embodiment, the present invention is not limited to this example, and it may be divided into more than three paths. In that case, the fin pitch may be different for each path or The configuration may be divided into 3 to 4 types and configured as described above.

In the case of manufacturing the heat exchanger of the present invention having the above structure, a plurality of types of inner fins 13 having different fin pitches are manufactured, and the inner fins 13 are inserted into the tube 5 to attach the tube 5 to the header. Attach to tubes 2 and 3.

That is, the tube 5 in which the inner fin 13 having the minimum fin pitch PA is inserted is arranged in the first path A of the condenser core 4, and the tube 5 in which the inner fin 13 having the intermediate fin pitch PB is inserted is secondly arranged. The tube 5 in which the inner fin 13 of the largest fin pitch PC is inserted is arranged in the path B and is arranged in the third path C of the capacitor core 4.

Then, the caps 7 and 8, the heat radiation fins 6, and the end plates 14 are assembled together with the tube 5, and after temporarily fixing them with an appropriate jig, they are carried into a brazing furnace, and they are put together with the respective members. First, the inner fin 13 is brazed to the tube 5.

The heat exchanger 1 manufactured in this manner is installed at a predetermined position of an automobile, and high-temperature and high-pressure refrigerant gas is sent to the upper half of the header pipe 2 from a compressor (not shown) through an inlet pipe 9 during air conditioning operation. Be done.

The refrigerant gas is sent out from the header pipe 2 into the tube 5 of the first path A, and moves inside the tube 5 toward the header pipe 3 side. At this time, the refrigerant gas is urged to exchange heat through the inner and outer inner fins 13 and the heat radiation fins 6, and in particular, the inner fins 13 in the tubes 5 of the first pass A are formed with a fine fin pitch PA. Therefore, it makes high density contact with the refrigerant gas and promptly promotes its heat exchange. Even under such contact, passage resistance does not become a problem when contacting with the refrigerant gas.

As described above, the refrigerant is urged to exchange heat while moving in the first pass A, but the heat exchange in the pass A generally progresses locally and does not reach the whole, so that the refrigerant is in a substantially gas phase state. And flows into the upper half of the header pipe 3.

After that, the refrigerant is sent from the header pipe 3 to the tube 5 of the second path B, and moves inside the tube 5 to the header pipe 2 side. During that time, the refrigerant gas undergoes heat exchange via the inner and outer inner fins 13 and the heat radiation fins 6, and is gradually liquefied to form a gas-liquid two-phase state.

In this way, when the gas-liquid two-phase state is achieved, the heat exchange is most vigorously and efficiently performed, the gas phase portions of the cooling medium are liquefied one after another, and these move in the tube 5. In this case, since the fin pitch PB of the inner fin 13 in the tube 5 of the second pass B is densely formed in accordance with the fin pitch PA, the inner fin 13 comes into contact with the refrigerant gas at a high density and promotes its heat exchange. ..

Therefore, the refrigerant flows into the lower half portion of the header pipe 2 in the gas-liquid two-phase state, and this time, this is sent out from the header pipe 2 to the tube 5 of the third pass C, and the inside of the tube 5 becomes the header. Move to the pipe 3 side. During that time, the refrigerant is heat-exchanged via the inner and outer inner fins 13 and the heat radiation fins 6, and the remaining gas phase portion is liquefied and completely liquefied.

When the liquid refrigerant moves in the tube 5 as described above, its passage resistance is generally much larger than that in the case of the air cooling medium, and is substantially equal to the passage resistance of the entire condenser core 4. However, since the fin pitch PC of the inner fin 13 of the third pass C is formed most coarsely in the passes A, B, C4, the contact with the refrigerant is also rough and the passage resistance is lowered. Therefore, the passage resistance of the entire core 4 is reduced, and the power of the compressor for circulating the refrigerant can be reduced accordingly.

On the other hand, if the fin pitch is roughened in this way, the heat exchange capability is reduced, but in the third pass C, most of the refrigerant has finished heat exchange, and the liquid refrigerant moves. Since the heat exchange efficiency of the third pass C is originally low, even if the passage resistance is prioritized in the pass C, the heat exchange capability of the entire capacitor 1 does not decrease.

The refrigerant thus liquefied is then pushed out of the outlet pipe 10 and moves to the receiver tank (not shown) side.

[0030]

[Effect of the device]

 As described above, the heat exchanger of the present invention forms the passage widths of the heat exchange fluid of the inner fins inserted in the tubes of each path to be the same, and the passage widths of the heat exchange fluid in the core are At least the paths located on the upstream and downstream sides are made different, and the passage width of the inner fins of the paths located on the downstream side is made wider than the passage width of the upstream path. Due to the heat exchange, the heat exchange capacity of the heat exchanger itself does not decrease, the passage resistance of the heat exchange fluid in the entire heat exchanger is reduced, and the circulating power can be reduced. In particular, this effect has a practical effect of reducing the compressor power and reducing the load on the engine when the present invention is applied to a condenser of a vehicle air conditioner.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main part of the present invention.

FIG. 3 is a cross-sectional view showing the fin pitch of the inner fin applied to the present invention for each tube of each pass, and (a) shows the first
The fin pitch in the pass, (b) the fin pitch in the second pass, and (c) the fin pitch in the third pass.

FIG. 4 is an exploded perspective view showing a main part of another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the fin pitch of the inner fin applied to the other embodiment for each tube of each pass,
(A) is the fin pitch in the first pass, (b) is the second
The fin pitch in the pass, (c) shows the fin pitch in the third pass.

[Explanation of symbols]

 1 heat exchanger 2, 3 header pipe 4 core 5 tube 6 radiating fin 13 inner fin A, B, C path PA, PB, PC passage width (fin pitch)

Claims (1)

[Scope of utility model registration request] 1. A pair of header pipes having a plurality of inner sections are provided, and a core in which a plurality of tubes having inner fins inserted therein and heat radiation fins are laminated is disposed between the header pipes, and In the heat exchanger in which the core is divided into multiple paths consisting of multiple tubes that move the heat exchange fluid in the same direction, and the heat exchange fluid is made to meander between the header pipes, it is inserted in the tubes of each path. The inner fins have the same passage width of the heat exchange fluid, and the passage widths are made different at least in the paths of the heat exchange fluid in the core located on the upstream and downstream sides, so that the inner fins of the paths located on the downstream side are different. A heat exchanger characterized in that the passage width is formed wider than the passage width of the upstream path.