JPH11211277A - Subcool system condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sub-cool system condenser capable of taking out a condensed refrigerant in a supercooled condition, wherein the system is integrally formed compact as a whole, necessitates the least restriction on an installation space and an arrangement layout relative to other instruments, and can be advantageously installed in a narrow engine room of an automobile or the like. SOLUTION: A core portion 10 is constructed such that the core portion 10 is provided with a pair of headers 1a, 1b extending in a vertical direction and one header 1b has one end thereof extended longer than corresponding one end of the other header 1a and between both headers 1a, 1b, a plurality of heat exchanging tubes 2 are disposed in parallel. The core portion 10 constitutes a condensing portion C having a multiflow construction The inside of one end portion of the header 1b including the extended portion is partitioned so as to define a tank portion T. Between the lower portion of a liquid phase and in the tank portion T and a refrigerant outlet 6b, an extruded porous tube 3 is communicably disposed thus constituting a sub cool portion S having a serpentine structure.

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 extending headers which are separated from each other and one end of one of the headers. The side is extended longer than one end of the other header, and a plurality of horizontal heat exchange pipelines each having both ends connected to both headers are arranged in parallel between both headers except for the extended portion. A core portion is formed, and this core portion constitutes a multi-flow structure condensing portion in which the refrigerant flowing from the refrigerant inlet flows in a meandering manner by partitions in both headers, and the inside of one end including the extended portion of the one header is formed. Is formed into a tank for storing the liquid refrigerant and the gas refrigerant condensed and condensed, and a meandering extruded perforated tube is connected between the lower part of the liquid phase and the refrigerant outlet in the tank. Thus, a subcooled portion having a serpentine structure is formed, and the refrigerant having passed through the condensing portion flows into the tank portion, and only the liquid refrigerant flows from the tank portion into the subcooled portion, undergoes supercooling, and is guided to the refrigerant outlet. Is set to.

In the above subcool system condenser, the gas refrigerant flowing from the refrigerant inlet is cooled and condensed by efficient heat exchange with the outside air while flowing in a meandering manner through the condensing portion of the multi-flow structure, and is cooled in a gas-liquid mixed state. Flow into the tank. In this tank portion, uncondensed gas refrigerant accumulates in the upper portion, and only the liquid refrigerant that accumulates in the lower portion flows into the subcool portion of the serpentine structure, where it is supercooled by heat exchange with outside air and stabilized from the refrigerant outlet. The liquid refrigerant is sent to the evaporator side. In this case, since the refrigerant passing through the subcool portion has a low pressure loss in a liquid state, no trouble occurs even in a serpentine structure.

In the tank section, a surplus of the refrigerant in the circulation cycle can be stored in such a manner that the gas-liquid ratio is changed in accordance with the load fluctuation, and a liquid tank separate from a condenser body such as a conventional subcool system condenser is provided. Since there is no lead-in / out pipe connecting the above, the ability to cope with a load change can be enhanced without increasing the amount of charged refrigerant. Moreover, with this sub-cool system capacitor,
The entire unit including the condenser unit, subcool unit and tank unit is a single flat panel, and there is no part that greatly protrudes from the capacitor body such as the liquid tank in the conventional subcool system condenser. The layout restrictions on the equipment are extremely small, and a special mounting structure for ensuring vibration isolation is not required.

The subcooled portion of the serpentine structure in such a subcooled system capacitor may be formed such that upper and lower portions correspond to the extending portion of one header, and left and right portions correspond to the inner end of the header. If the condenser is arranged so as to be planarly adjacent to the core part of the condensing part in a region corresponding to the interval with the outer end of the other header, the entire condenser is more compact, so that the installation space and There are fewer restrictions on the layout of arrangement with other devices.

[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 shows a capacitor of a first embodiment, (a) is a front view, and (b) is a principle diagram. FIG. 2
Shows a capacitor of the second embodiment, (a) is a front view,
(B) is a principle diagram.

The subcooled system condenser of the first embodiment comprises a flat tube (2) extending along a horizontal direction as a heat exchange conduit between a pair of left and right vertically extending headers (1a) (1b) facing each other. Are arranged at equal intervals in parallel with the both ends connected to both headers (1a) and (1b) to form a core portion (10). The right header (1b) extends downward longer than the left header (1a), and the extending portion is up and down, and the left and right extend from below the core (10) to below the left header (1a). A serpentine tube (3) bent in a meandering shape that repeatedly makes a U-turn at the end of a straight portion along the horizontal direction is disposed within the width region, and the lower end of the serpentine tube (3) is located on the right header. (1b) is communicatively connected to the extended lower end, and the left header (1a)
The serpentine tube (3) located near the lower end of the tube
Is provided with a refrigerant outlet (6b) at the upper end of.

A corrugated fin (4) is a strip-shaped cover (5) provided on the upper edge of the core (10) between adjacent flat tubes (2)... And a top-most flat tube (2). ), Between adjacent straight portions of the serpentine tube (3), and between the lowermost flat tube (2) and the uppermost straight portion of the serpentine tube (3). (Not shown in the center).

The left header (1a) has a refrigerant inlet (6a) at the top and is internally partitioned vertically by a partition plate (7), and the inside of the right header (1b) is partitioned by the left header (1a). The core part (10) constitutes a condensing part (C) having a three-pass multi-flow structure by being vertically divided by a partition plate (7) at a lower position. The lower space (11a) including the downward extension of the right header (1b) constitutes the tank (T), and the serpentine tube (3) constitutes the subcool part (S).

In the subcooled system capacitor of the second embodiment, the right header (1b) extends upward and long, contrary to the first embodiment. ), A serpentine tube (3) bent in a meandering shape similar to the above is disposed in a region extending from above the left header (1a). And the lower end of this serpentine tube (3)
From the connection position of the uppermost flat tube (2) in the right header (1b), it is connected higher by the arrangement space of the corrugated fin (4), and the refrigerant outlet (6b) is connected to the upper end of the serpentine tube (3). ) Is provided.

The left header (1a) of this condenser has a refrigerant inlet (6a) at the lower part, and the inside is vertically divided at an intermediate height, and the inside of the right header (1b) is the uppermost flat tube (2). The core (10) constitutes a condensing part (C) having a three-pass multi-flow structure, as in the first embodiment, by being partitioned up and down at a position several steps lower than the connecting position. The upper space (11b) including the upwardly extending portion of the right header (1b) constitutes the tank portion (T), and the serpentine tube (3) constitutes the subcool portion (S).

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) and closing with a cover plate. An extruded aluminum material, a serpentine tube (3) obtained by bending an aluminum extruded porous tube in a meandering shape, and a corrugated fin (4) formed by bending an aluminum brazing sheet into a corrugated shape are used. The flat tubes (2) are connected to both headers (1
a) In a state where both ends are inserted into the circumferential slit holes provided in the peripheral wall of (1b), they are collectively brazed in a furnace to be in communication with the headers (1a) and (1b). Connected and integrated.

In the subcool system condensers of the first and second embodiments, the high-temperature and high-pressure gas refrigerant pumped from the compressor (not shown) flows in from the refrigerant inlet (6a) and has a multi-flow structure. Condensing part (C)
During the meandering flow, the core (11) is cooled and condensed by heat exchange with the outside air flowing in a direction perpendicular to the plane of the paper, and flows into the tank (T) in a gas-liquid mixed state. Then, in the tank section (T), the uncondensed and uncoagulated gas refrigerant accumulates in the upper portion, and only the liquid refrigerant accumulated in the lower portion flows into the subcool portion (S) and passes through the serpentine tube (3). Is supercooled by heat exchange with the outside air in the same manner as described above, flows out as a stable low-temperature liquid refrigerant from the refrigerant outlet (6b), and is guided to the evaporator (not shown) side.

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 the subcool portion (S), the refrigerant passing therethrough has a low pressure loss in a liquid state, so that no problem occurs even in a serpentine structure.

Moreover, in this capacitor, the entire structure including the condensing part (C), the subcooling part (S) and the tank part (T) is formed into a single flat and compact panel, and the condenser is like a conventional liquid tank. Since there is no portion that protrudes greatly from the main body, there are very few restrictions on the installation space and arrangement layout with other equipment. Further, since the tank portion (T) is configured in the header (1b) itself, a conventional liquid tank is not provided. Such a special mounting structure for ensuring the vibration isolation is not required, and it can be easily and easily incorporated into a narrow area such as an engine room of an automobile where various other devices coexist.

The tank (T) may be loaded with a suitable adsorbent such as molecular sieve so as to adsorb and remove impurities 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 (11) of the condensing section (C), the number of passages in each pass, the position of the refrigerant inlet / outlet, the vertical and horizontal dimensions of the core section (11), the subcool section (S Regarding the detailed configuration such as the length of the serpentine tube (3) and the number of meandering repetitions, the design can be variously changed in addition to the embodiment.

[0023]

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 integrated into a single flat panel, and there are no parts protruding laterally or forward and backward from the capacitor body, so there are few restrictions on installation space and layout with other equipment, and vibration isolation It can be easily secured, can be installed advantageously in a narrow engine room of an automobile, and the like, and can be provided that has a high ability to cope with load fluctuation without increasing the amount of charged refrigerant in the refrigerant cycle.

According to the second aspect of the present invention, there is provided the above-mentioned subcooling system capacitor, in particular, which is compact in its entirety and has less restrictions on installation space and layout with other devices.

[Brief description of the drawings]

FIG. 1 shows a subcooled system capacitor according to a first embodiment of the present invention. FIG. 1A is a front view, and FIG.

FIGS. 2A and 2B show a subcool system capacitor according to a second embodiment of the present invention, wherein FIG. 2A is a front view and FIG.

[Explanation of symbols]

 1a, 1b header 2 flat tube (heat exchange pipe) 3 serpentine tube 6a refrigerant inlet 6b refrigerant outlet 7 ... Partition plate 10 ... Core part 11a ... Lower space 11b ... Upper space C ... Condensing part T ... Tank part S ...・ Subcool section

Claims (2)

[Claims] 1. A header comprising a pair of vertically spaced headers facing each other, wherein one end of one header extends longer than one end of the other header, and except for this extended portion, between the two headers, A plurality of horizontal heat exchange pipes each having both ends connected to both headers are arranged in parallel to form a core portion, and this core portion meanders refrigerant flowing from a refrigerant inlet by a partition in both headers. A condensing section of a multi-flow structure that flows into the tank, and forms a tank section for storing the condensed liquid refrigerant and gas refrigerant by partitioning the inside of one end including the extension of the one header, and the liquid phase in this tank section. A meandering extruded perforated tube is connected and connected between the lower portion and the refrigerant outlet to form a subcooled portion having a serpentine structure, and the refrigerant having passed through the condensing portion flows into the tank portion. Set subcool system condenser comprising as only the liquid refrigerant from the tank section is led to the refrigerant outlet receiving inlet to subcooling the subcooler. 2. A subcooled part having a serpentine structure,
The upper and lower sides correspond to the extension part of one header, and the left and right sides are planarly adjacent to the core part of the condensing part in a region corresponding to the interval between the inner end of the header and the outer end of the other header. The subcool system capacitor according to claim 1, wherein the subcool system capacitor is arranged so as to perform the following operations.