JPH11211278A - Subcool system condenser - Google Patents

Abstract

(57) [Summary] [PROBLEMS] As a subcooling system condenser having a function of deriving a condensed refrigerant into a supercooled state, the whole is compactly integrated, and there are few restrictions on installation space and arrangement layout with other equipment, An object that can be advantageously installed in a narrow engine room or the like of an automobile is provided. SOLUTION: A pair of headers along a vertical direction (1a).
(1b) In a multi-flow type condenser in which a plurality of heat exchange pipes (2) are arranged in parallel to constitute a core portion (10), one end is placed on the top of the core portion (10). A hollow cylinder (3) communicated and connected to the header (1a) is provided, an upper space (11a) of the header (1a) communicating with the hollow cylinder (3) is partitioned, and the upper space (11a) and the hollow cylinder (3) are separated. ) Constitute a tank part (T), the core part (10) is composed of an upper condenser part (C) and a lower subcool part (S), and the header (1b) has an upper space (11a) and a subcool part. A bypass pipe (12) for communicating with the lower space (11b) of (S) is additionally provided.

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 plurality of heat exchange pipes connected in parallel are arranged in parallel to form a core portion, and a refrigerant flowing from a refrigerant inlet flows in a meandering manner through the core portion by partitions in both headers and reaches a refrigerant flow. In the capacitor of the type, a hollow cylinder having one end connected to one header is connected to the top of the core portion in parallel with the heat exchange pipe, and an upper space of the header communicating with the hollow cylinder is partitioned. The upper space and the hollow cylinder constitute a tank portion for storing the liquid refrigerant and the gas refrigerant condensed, and the core portion includes an upper condensing portion and a lower subcooling portion, and a subcooling portion. The lower space in the corresponding both-side header is partitioned, and the header having the tank portion is provided with a bypass pipe for communicating the upper space and the lower space of the subcool portion outside the header, and the refrigerant flowing from the refrigerant inlet is provided. The liquid flows from the lower side of the condensing section in a meandering manner and flows into the tank section. From the tank section, only the liquid refrigerant flows into the subcool section through the bypass pipe, is supercooled in the subcool section, and is guided to the refrigerant outlet. It is assumed to be set to be.

In the above subcool system condenser, the gas refrigerant flowing from the refrigerant inlet is cooled and condensed by heat exchange with the outside air during the meandering flow in the condensing section, and flows into the tank section in a gas-liquid mixed state. In this tank portion, uncondensed gas refrigerant accumulates in the hollow cylinder, and only liquid refrigerant flows from the upper space of the header into the lower subcool portion through the bypass pipe. Then, in the subcool section, the refrigerant is supercooled by heat exchange with the outside air and sent to the evaporator side as a stable liquid refrigerant from the refrigerant outlet. 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 structure including the condensing part, the subcooling part, and the tank part has a single flat panel form, and the bypass pipe is formed to be thin and has little protrusion along the header. Because there is no part that greatly protrudes from the capacitor body such as a liquid tank in a conventional subcooled system capacitor, the installation space and layout restrictions with other equipment are extremely small. Can be directly supported by the header in the same manner as the heat exchange pipe, so that there is no need for a special mounting structure such as a conventional liquid tank for securing vibration isolation.

In such a subcooled system capacitor, the refrigerant inlet and the refrigerant outlet are provided close to one header on one side, and fixed to the side surface of the header so as to cover the outside of the entrance. If the refrigerant inlet and outlet pipes are connected via the block-shaped union, the structure of the refrigerant inlet / outlet is simplified and the condenser is easily incorporated into the refrigerant cycle system. .

[0012]

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.
Is a plan view of the same, and FIG. 3 is a principle view of the capacitor.

This subcooled system condenser includes a pair of left and right headers (1
a) Between (1b), a number of flat tubes (2) extending in the horizontal direction as heat exchange conduits are equally spaced, with both ends being connected to and connected to both headers (1a) (1b). The core portion (10) is arranged in parallel. At the top of the core portion (10), a square pipe-shaped hollow cylinder (3) communicated and connected to the upper end of the right header (1b) on the lower surface on one end side is spaced from the uppermost flat tube (2). The left end of the left header (1a) is in contact with the top of the left side header (1a). (4) Corrugated fins, between adjacent tubes (2), between hollow tube (3) and uppermost tube (2), core (10)
The space between the strip-shaped cover (5) provided on the lower edge and the tube (2) is arranged over substantially the entire length of the space (the center part is not shown in the figure).

The left header (1a) has a refrigerant inlet (6a) at the lower part and a refrigerant outlet (6b) disposed adjacently below the refrigerant inlet (6a), and a refrigerant through a block-shaped union (7) fixed to the outer periphery of the lower part. The inlet pipe (8a) and the refrigerant outlet pipe (8b) are respectively connected to the refrigerant inlet (6a) and the refrigerant outlet (6).
b). Further, the inside of the left header (1a) is partitioned by partition plates (9a) and (9b) at two positions: an intermediate height position and a lower position between the refrigerant inlet (6a) and the refrigerant outlet (6b). I have. On the other hand, the right header (1b) has the upper position and the left header (1b).
b) The interior is partitioned by two partition plates (7c) and (7d) at two locations, that is, the lower partition and the lower position at the same height, and the partitioned upper space (11a) and lower space (11b) A bypass pipe (12) is provided for communicating the air through the outside of the header.

A tank (T) is constituted by the upper space (11a) of the left header (1a) and the hollow cylinder (3) communicating with the upper space (11a), and three paths are located upstream of the tank (T). The condensing part (C), and the downstream side is a sub-cool part (S) of one pass.

Each of the constituent members is, for example, a flat tube (2) having both ends of a pipe formed by bending an aluminum brazing sheet into a cylindrical shape as both headers (1a) and (1b) with lid plates. Extruded aluminum material, corrugated aluminum brazing sheet as corrugated fins (4), corrugated aluminum brazing sheet as hollow cylinder (3), rectangular pipe as aluminum brazing sheet, and bypass pipe (12) An aluminum extruded pipe or the like is used. The tubes (2) are brazed together in a furnace with both ends inserted into circumferential slit-shaped holes provided in the peripheral walls of both headers (1a) (1b). Both headers (1
a) It is connected and integrated to communicate with (1b).

The subcool system condenser is of a multi-flow type, and a high-temperature and high-pressure gas refrigerant fed from a compressor (not shown) is supplied to a refrigerant inlet (6).
In the process of flowing from a) and flowing through the condensing portion (C) in a meandering manner through a plurality of tubes (2), the core portion (10) is cooled by heat exchange with the outside air flowing in a direction perpendicular to the paper surface. -Condenses and flows into the tank (T) in a gas-liquid mixed state. Then, in the tank (T), uncondensed and unsolidified gas refrigerant is accumulated in the hollow cylinder (3), and the header (1).
Only the liquid refrigerant flows into the lower space (11b) from the upper space (11a) through the bypass pipe (12) in the upper space (11a) and is supercooled by heat exchange with the outside air in the process of passing through the subcooling section (S). 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.

In addition, in this condenser, the entire structure including the condensing part (C), the subcooling part (S) and the tank part (T) is formed as a single flat panel, and the bypass pipe (1) is provided.
2) Use a thinner header (1) as shown.
b), it can be arranged in a form with little protrusion, and since there is no portion that greatly protrudes from the capacitor body such as a conventional liquid tank, there is very little restriction on the installation space and the layout of arrangement with other equipment. Since the hollow cylinder (3) of the tank portion (T) can be directly supported by the headers (1a) and (1b), a special mounting structure for securing vibration proofness like a conventional liquid tank is not required. It can be easily incorporated into a site where various other devices coexist, such as an engine room of an automobile, without any trouble.

Further, as shown in the embodiment, the header (1
If a refrigerant inlet (6a) and a refrigerant outlet (6b) are provided in close proximity to a), a refrigerant introduction and discharge pipe (8) is connected via a block-shaped union (7) in which an inflow / outflow connection is integrated.
a) (8b) can be easily connected, the condenser can be easily incorporated into the refrigerant cycle system, and the structure of the refrigerant inlet / outlet part of the condenser itself can be simplified.

In the condenser of the embodiment, the bypass pipe (12) projects to the side of the header (1a).
The protruding direction can be freely changed, for example, in the front-rear direction indicated by a virtual line in FIG. Further, an appropriate adsorbent such as molecular sieve may be loaded into the hollow cylinder (3) of the tank (T), and the hollow cylinder (3) may be set so as to adsorb and remove impurity components such as moisture in the refrigerant. In addition, in the subcool system condenser according to the present invention, the number of passes in the core section (10) of the condensing section (C) and the subcool section (S), the number of passages in each path, the position of the refrigerant inlet / outlet, the length and width of the core section (10). Regarding the detailed configuration such as dimensions, various design changes can be made in addition to the embodiment.

[0022]

According to the first aspect of 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 tank corresponding to a condensing part, a subcooling part and a conventional liquid tank is provided. The unit is compactly integrated as a single panel with a flat part, and there are no parts that protrude laterally or back and forth from the capacitor body, so there are few restrictions on installation space and layout with other equipment, and vibration isolation That can easily be installed in a narrow engine room of an automobile, and can have a high ability to cope with load fluctuations without increasing the amount of charged refrigerant in a refrigerant cycle. .

According to the second aspect of the present invention, in the above-mentioned subcool system condenser, particularly, the pipes for introducing and discharging the refrigerant can be easily connected, and the condenser can be easily incorporated into the refrigerant cycle system, and the condenser itself can be used. There is an advantage that the structure of the refrigerant inlet / outlet is simplified.

[Brief description of the drawings]

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

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

FIG. 3 is a principle diagram of the subcool system capacitor.

[Explanation of symbols]

 1a, 1b header 2 flat tube (heat exchange conduit) 3 hollow cylinder 6a refrigerant inlet 6b refrigerant outlet 7 ··· Union 8a ···· Refrigerant introduction pipe 8b ···· Refrigerant discharge pipe 9a to 9d ··· Partition plate 10 ··· Core part 11a ··· Upper space 11b ····· Lower space 12 ····· Bypass pipe C ····· Condensing part T ···· Tank part S ···· Subcool part

Claims (2)

[Claims] 1. A plurality of heat exchange pipes, both ends of which are connected to both headers, are arranged in parallel between a pair of vertically opposed headers spaced apart from each other to form a core portion. In the multi-flow type condenser in which the inflowing refrigerant flows in a meandering manner through the core portion by the partitions in both headers and reaches the refrigerant outlet, a hollow cylinder having one end connected to one header at the top of the core portion is provided. While being arranged in parallel with the heat exchange pipeline,
An upper space of the header communicating with the hollow cylinder is partitioned, and a tank portion for storing the liquid refrigerant and the gas refrigerant condensed in the upper space and the hollow cylinder is configured. The core portion includes an upper condensing portion and a lower subcool portion. The lower space in the header on both sides corresponding to the subcool portion is partitioned, and the header having the tank portion is provided with a bypass pipe for communicating the upper space and the lower space of the subcool portion outside the header, Refrigerant flowing from the refrigerant inlet flows in a meandering manner from the lower side of the condensing section and flows into the tank section. From the tank section, only liquid refrigerant flows into the subcool section through the bypass pipe and passes through the subcool section. A subcooled system condenser that is set to be cooled and guided to the refrigerant outlet. 2. A refrigerant inlet and a refrigerant outlet are provided close to one header, and the refrigerant is introduced and discharged through a block-shaped union fixed to the side surface of the header so as to cover the outside of the entrance. The subcool system capacitor according to claim 1, wherein a pipe is connected.