JPH11211279A - Subcool system condenser - Google Patents

Abstract

(57) [Summary] [PROBLEMS] As a subcooled system condenser having a function of deriving a condensed refrigerant in a supercooled state, the whole is compactly integrated, and there are few restrictions on installation space and arrangement layout with other equipment. And a device which can be advantageously installed in a narrow engine room of an automobile. SOLUTION: A first capacitor 1A having a core portion 10 composed of heat exchange pipes 2 arranged in parallel between a pair of headers 11 and 12 extending along a vertical direction, and a first capacitor 1A having the same structure and a small vertical width of the core portion 10. The two condensers 1B are integrated so as to be overlapped in front and back, the first condenser 1A constitutes a condensing part of the refrigerant flowing from the refrigerant inlet 6a, and the second condenser 1B
It has a short header 21 and a long header 22 that forms a tank part. The core part 10 constitutes a subcool part, and the header 11 of the first condenser 1A and the long header of the second condenser 1B
With the header 22, only the liquid refrigerant flows into the subcool section from the header 22, is supercooled, and is guided to the refrigerant outlet 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subcool system condenser used as a condenser for a car air conditioner or the like.

[0002]

2. Description of the Related Art Generally, a cooling mechanism such as a car air conditioner cools and condenses a high-temperature and high-pressure gas refrigerant discharged in a compressed state from a compressor by heat exchange with outside air in a condenser, and then cools the liquid tank (with a receiver). From the liquid tank, and sends only the liquid refrigerant from the liquid tank to the evaporator as a low-pressure / low-temperature atomized state via an expansion valve, and evaporates and gasifies by heat exchange with air in the vehicle to send to the compressor. With this cycle, the heat inside the vehicle is discharged outside the vehicle.

[0003] However, the refrigerant condensed in the condenser has an insufficient degree of supercooling and is in an unstable state in which it is vaporized due to slight heat reception or pressure loss on the downstream side. Tends to occur. As a countermeasure, a state in which a second condenser is conventionally interposed downstream of the liquid tank, and the liquid refrigerant is supercooled to a temperature about 2 to 5 ° C. lower than the condensing temperature by this condenser to stabilize the liquid refrigerant as a liquid refrigerant. In order to increase the cooling efficiency by lowering the refrigerant discharge temperature at the evaporator, it is being studied.

However, in such a configuration in which a second condenser for supercooling is separately provided, a space for installing the condenser is required, and the amount of refrigerant to be charged in the refrigerant cycle is increased. In order to cope with this problem, the liquid tank must be enlarged, especially when it is installed in a small engine room for car air conditioners, the space is greatly restricted, and the layout is extremely complicated in relation to other equipment. In addition, since a strong mounting structure is required to secure vibration resistance, there is a problem in that the assembly cost of the entire engine room is high and it is difficult to make the engine room compact.

Therefore, in recent years, the original condenser section and the supercooling condenser section, that is, the subcool section, have been integrated, and a liquid tank has been attached to the side of the integrated condenser body in a protruding state. There have been proposed many subcooled system condensers in which a liquid tank communicates with a refrigerant outlet of the former condenser part and a refrigerant inlet of the latter condenser part by respective pipes (Japanese Patent Laid-Open Nos. 4-92714 and 4-92714). 22743
6, No. 9-170853, No. 9-170854,
JP-A-6-36912, etc.). That is, according to these subcool system capacitors, compared with a configuration in which a subcooling capacitor is separately provided, there is an advantage that the amount of refrigerant to be charged can be reduced, the installation space is reduced, and the mounting structure is simplified.

[0006]

However, in the subcool system capacitor proposed above, since the liquid tank is mounted on the side of the capacitor body in a protruding state, it is still limited in installation space.
There is still much room for improvement, such as difficulty in adoption due to the layout of the arrangement with other devices, and the necessity of changing the arrangement and design of other devices due to the adoption. In particular, in the case of a condenser for car air conditioners, since it is installed in a narrow space between the radiator and the radiator grille at the front of the vehicle body, it is necessary to design the core of the condenser body narrower by the amount of the liquid tank projection. In addition to this, the performance of the condenser and, consequently, the performance of the car air conditioner will be reduced, and the downsizing of the engine room will be hindered.It cannot be adopted depending on the model of the vehicle. However, there is a problem that it takes much time and costs for assembling.

In view of the above circumstances, the present invention provides a subcooling system condenser having a function of sending condensed refrigerant to the evaporator side in a sufficiently supercooled state, and the entirety including a portion corresponding to a conventional liquid tank is made compact. It is integrated and has no parts that protrude laterally or forward and backward from the capacitor body, and there are few restrictions on installation space and layout with other equipment, and it can be installed advantageously in a narrow engine room of a car. It is intended to be.

[0008]

In order to achieve the above object, a subcool system capacitor according to a first aspect of the present invention comprises a pair of vertically opposed headers spaced apart from each other and having both ends at both ends. A first condenser having a plurality of horizontally arranged heat exchange conduits connected in parallel and forming a core portion, and a second condenser having a core portion having the same structure and a smaller vertical width than the first condenser. The first condenser constitutes a condensing part in which the refrigerant flowing from the refrigerant inlet flows in a meandering manner through the core part by the partition of both headers, and the second condenser corresponds to the core part. A short header, and a long header extending above the header, the core portion constituting a subcooled portion, and an outlet provided in the header on one side of the first capacitor. The long header of the second condenser communicates with the long header of the second condenser to form a tank section for storing condensed liquid refrigerant and gas refrigerant, and only the liquid refrigerant flows from the tank section into the subcool section to be supercooled. And guided to the refrigerant outlet.

In the above-mentioned subcooled system condenser, the gas refrigerant flowing from the refrigerant inlet of the first condenser is cooled and condensed by heat exchange with the outside air in the meandering flow in the core part which forms the condensing part, and in a gas-liquid mixed state. It flows into the tank part of the header on one side of the second condenser. In this tank portion, uncondensed gas refrigerant accumulates in the upper portion of the header, and only the liquid refrigerant accumulated in the lower portion flows into the core portion forming the subcool portion of the second condenser, and heat exchange with outside air in the subcool portion. Is supercooled, and is sent from the refrigerant outlet to the evaporator side as a stable liquid refrigerant. In the tank section, the surplus refrigerant in the circulation cycle can be stored by changing the gas-liquid ratio according to the load fluctuation, and a separate liquid tank is connected to the capacitor body like a conventional subcool system condenser. Since there is no outgoing / incoming pipe line, the ability to respond to load fluctuations can be increased without increasing the amount of charged refrigerant.

Moreover, in this subcool system condenser, the entire condenser including the condenser section, the subcool section, and the tank section is formed in a simple form in which two condensers are stacked one on the other, and is a capacitor like a liquid tank in the conventional subcool system condenser. Since there is no part that protrudes greatly from the main body, there are few restrictions on installation space and layout with other equipment, and since the tank part is composed of one side header of the second condenser, it is similar to a conventional liquid tank. A special mounting structure for securing vibration isolation is not required.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a subcooled system capacitor according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a front view of the capacitor, FIG.
3A is a longitudinal sectional view taken along the line II in FIG. 1, FIG. 3B is a transverse sectional view taken along the line II in FIG. 1, and FIG. FIG. 4 is a principle view showing a state in which a second capacitor is expanded.

As shown in FIGS. 2 and 2, this subcool system capacitor includes a first condenser (1A) and a second condenser (1B), both of which are of a multi-flow type, and headers on both sides thereof extend vertically. In the arrangement state, they are integrated so as to overlap each other.

In the first condenser (1A), a large number of flat tubes (2) extending in the horizontal direction as heat exchange conduits are provided between a pair of left and right headers (11) (12) facing each other. With the both ends connected to both headers (11) and (12), they are arranged at equal intervals in parallel, and corrugated fins (4) are arranged between adjacent tubes (2). Is composed. (5) is the core part (10)
And a cover (5) on a band plate provided on the upper and lower edges of the cover, and a corrugated fin (4) is also arranged between the cover (5) and an adjacent tube (2). Then, as shown in FIG. 3, the left header (11) has a refrigerant inlet (6a) at the top.
The inside of the right header (12) is partitioned by the partition plate (7) at a slightly higher level than the middle, and the inside of the right header (12) is also partitioned by the partition plate (7).
At a lower level than the middle, and a lower outlet (8
a), and thus has a three-pass multi-flow structure.

The second capacitor (1B) has the same left and right width as the first capacitor (1A), but has both side headers (2B).
1) A plurality of flat tubes (2)... Arranged in parallel between (22) has a core (10) of the same configuration, and the vertical width is much smaller than that of the first capacitor (1A). The left header (21) having the refrigerant outlet (6b) has a short length corresponding to the vertical width of the core (10), but the right header (22) having an inlet (8b) at the bottom. Is extended upward and the upper end is set at the same height as the right header (12) of the first capacitor (1B). There is no partition inside the headers (21) and (22), and the core (1
0) forms a one-pass multi-flow structure.

Thus, when the right headers (12) and (22) of the first capacitor (1A) and the second capacitor (1B) are overlapped in the front and rear direction and integrated as shown in FIGS. The outflow hole (8a) of the former and the inflow port (8b) of the latter match and communicate as a through hole (8).
As a result, the first condenser (1A) has a condensing part (C) as a whole, and the right header (22) of the second condenser (1B).
Are the tank part (T), and the core part (10) of the second condenser (1B) constitutes the subcool part (S).

Each component is, for example, a header (11), (12), (21), or (22) formed by sealing an aluminum brazing sheet into a cylindrically curved pipe at both ends with a cover plate, and a flat tube. As (2) ... an extruded aluminum material, and as corrugated fins (4) ... a corrugated aluminum brazing sheet is used. The tubes (2) are brought into communication with the headers on both sides by collectively brazing in a furnace with both ends inserted into circumferential slit-shaped holes provided on the peripheral walls of the headers on both sides. Connected and integrated.
The first capacitor (1A) and the second capacitor (1B)
Is integrally fixed by brazing or the like at the overlapping portions of the headers before and after.

In the subcooled system condenser having the above-described structure, a high-temperature and high-pressure gas refrigerant pumped from a compressor (not shown) flows in from the refrigerant inlet (6a) of the first condenser (1A) and enters the condensing section (C). In the process of flowing the core portion (10) in a meandering manner through a plurality of tubes (2) ... in a meandering manner, the core portion (10) is efficiently cooled by heat exchange with the outside air flowing in a direction perpendicular to the paper surface. Condensed,
The gas flows from the lower part of the right header (12) into the right header (22) of the second condenser (1B) as the tank part (T) through the through hole (8) in a gas-liquid mixed state. Then, in the tank section (T), the uncondensed gas refrigerant accumulates in the upper portion, and only the liquid refrigerant accumulated in the lower portion flows into the core portion (10) forming the subcool portion (S), and the subcool portion (S) Supercooled by heat exchange with the outside air as described above,
The refrigerant flows out from the refrigerant outlet (6b) as a stable low-temperature liquid refrigerant, and is guided to an evaporator (not shown).

In the tank section (T), the surplus refrigerant in the circulation cycle can be stored in a form in which the gas-liquid ratio is changed in accordance with the load fluctuation, and is separated from a condenser body such as a conventional subcool system condenser. Since there is no lead-in / out pipe connecting the liquid tank to the liquid tank, it exhibits a high ability to cope with load fluctuations without increasing the amount of charged refrigerant.

Moreover, in this condenser, the entire condenser including the condenser section (C), the subcool section (S) and the tank section (T) is integrated in a panel form in which two condensers are stacked, and is similar to a conventional liquid tank. Since there is no part that protrudes greatly from the main body of the condenser, there are very few restrictions on the installation space and layout of other equipment, and the tank (T) is composed of the right header (22) itself of the second condenser. This eliminates the need for a special mounting structure such as a conventional liquid tank to ensure vibration isolation, so it is easy to use even in a small area such as the engine room of a car where various other equipment coexists. Can be incorporated into

The tank (T) may be loaded with an appropriate adsorbent such as molecular sieve so as to adsorb and remove impurities such as moisture in the refrigerant. In addition, in the subcool system capacitor according to the present invention, the number of passes of the core portion (10) in the first and second capacitors (1A) and (1B), the number of passages in each pass, the position of the refrigerant inlet / outlet, and the number of passes of the core portion (10). Regarding the detailed configuration such as the vertical and horizontal dimensions, various designs can be changed in addition to the embodiment.

[0021]

According to the present invention, as a subcooling system condenser having a function of sending condensed refrigerant to the evaporator side in a sufficiently supercooled state, a condensing part, a subcooling part, and a tank part corresponding to a conventional liquid tank are provided as a panel. Since it is compactly integrated as a form and there is no part that protrudes laterally or back and forth from the capacitor body,
There are few restrictions on the installation space and layout of other equipment, and it is easy to secure vibration proofing, and it can be installed advantageously in narrow engine rooms of automobiles. It is possible to provide a vehicle having a high ability to cope with a load change without increasing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a subcooled system capacitor according to an embodiment of the present invention.

FIG. 2 is a plan view of the subcool system capacitor.

3 shows a communicating portion between an outlet of a first condenser and an inlet of a second condenser in the same subcool system condenser, and FIG. 3 (a) is a longitudinal sectional view taken along the line II in FIG. 1; FIG. FIG. 2 is a cross-sectional view of the loro wire of FIG.

FIG. 4 is a principle view of the subcool system capacitor.

[Explanation of symbols]

 1A 1st condenser 1B 2nd condenser 2 Flat tube (heat exchange pipeline) 4 Corrugated fin 6a Refrigerant inlet 6b ··· Refrigerant outlet 7 ···· Partition plate 8 ···· Through hole 8a ··· Outlet 8b ··· Inlet 10 ··· Core parts 11 and 12 ... Header of the first condenser 21,22 ... Header of the second condenser C ... Condensing part T ... Tank part S ... Subcool part

Claims (1)

[Claims] 1. A plurality of heat exchange pipes extending in a horizontal direction, both ends of which are connected to both headers, are arranged in parallel between a pair of headers extending in a vertical direction facing each other so as to form a core portion. One condenser and a second condenser having the same structure and a core part having a smaller upper and lower width than the first condenser are integrated in a state of being overlapped in front and back. The partition constitutes a condensing portion flowing in a meandering manner in the core portion, and the second capacitor has a short header corresponding to the core portion,
A long header extending above the header, the core portion constituting a subcool portion, an outlet provided on one side header of the first condenser is communicated with the long header of the second condenser, and the second condenser has a second header. The inside of the long header of the condenser constitutes a tank portion for storing the condensed liquid refrigerant and gas refrigerant, and only the liquid refrigerant flows from the tank portion into the subcool portion, is supercooled, and is guided to the refrigerant outlet. Subcool system condenser.