JP2006162189A - Receiver tank for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver tank for a heat exchanger for maintaining strength, reducing weight, and improving gas-liquid separation performance. <P>SOLUTION: This receiver tank is connected to a parallel flow type heat exchanger via an inflow pipe 7 and an outflow pipe 8 of a heating medium; and has a drying agent 30 for removing moisture in the heating medium and a filter 40 for filtering an impurity in the heating medium; and is composed of a lower cylindrical member 15 having a connecting part 11 of the inflow pipe and the outflow pipe in a side part and having an insertion port 12 of the drying agent and the filter on the lower end and an upper cylindrical member 13 joined to the upper end of this lower cylindrical member and blocking up the upper end. In this case, the thickness of the upper cylindrical member is thinly formed to the lower cylindrical member, and a fitting part 18 having an expansively opening tapered part 16 toward the tip, is formed on the lower end of the upper cylindrical member or the upper end of the lower cylindrical member, and the upper cylindrical member and the lower cylindrical member are fitted, brazed and joined by interposing a brazing material 50 interposed in the fitting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger receiver tank, and more particularly, to a parallel flow type heat exchanger receiver tank incorporated in an air conditioner installed in, for example, a large vehicle or an industrial machine.

  Conventionally, as a heat exchanger for a vehicle, a compact and high-performance heat exchanger with an aluminum receiver tank and a subcooling region, in particular, a heat exchange tube for cooling and condensing a heat medium are arranged in parallel. A so-called parallel flow type capacitor (PFC) having a corrugated fin having a large heat transfer area is widely used and produced.

  By the way, in recent years, as the performance of PFC has been widely recognized, the application has been expanded from passenger cars, which have been installed so far, to applications for large vehicles and industrial machines. There has been a demand for larger capacity.

  In increasing the size of the PFC, the expansion of the heat exchange surface can be handled by increasing the number and length of the heat exchange tubes, but when used in industrial heat exchangers, Not only that, the amount of desiccant installed in the refrigeration cycle is greatly increased. As a result, the desiccant is set, and the receiver tank that performs gas-liquid separation of the heat medium is also required to be large, and the volume and capacity of the receiver tank are several times larger than before, so the length and diameter of the receiver tank must be increased. I do not get.

  In addition, this type of receiver tank is formed of an aluminum cylindrical member, and is assembled integrally with the capacitor and peripheral parts, brazed and fixed, or assembled separately from the capacitor, What is connected to a capacitor via inflow and outflow piping is known.

However, in the case of a large receiver tank, there are problems in assembling and installation space in order to braze together with the condenser. After assembling the receiver tank separately, the receiver tank is connected to the condenser via the heat medium inflow and outflow piping. For example, a heat medium inflow / outflow pipe connected to the upper and lower ends of a receiver tank containing the desiccant and filter, or an inflow and outflow of heat medium to the upper or lower end of the receiver tank containing the desiccant and filter. There are known ones for connecting industrial pipes (for example, see Patent Document 1 and Patent Document 2).
JP-A-9-272331 (Claims, FIGS. 1 and 2) JP-A-2002-71242 (Claims and Figures)

  However, the receiver tanks described in JP-A-9-272331 and JP-A-2002-71242 all have a cylindrical receiver tank main body, so that the thickness of the receiver tank needs to be strong. If the thickness is increased in accordance with the part, the thickness of the entire cylinder is increased, so that there is a problem that the weight is increased. On the contrary, when the thickness is adjusted to the thin part, there is a problem of trade off that strength is insufficient.

  In addition, in the structure in which the heat medium inflow and outflow pipes are connected to the upper end and / or the lower end of the receiver tank, since the heat medium inflow and outflow are in the vertical direction, the liquid level of the heat medium stored in the receiver tank Becomes unstable and gas is generated, which causes a problem that the gas-liquid separation performance of the heat medium in the receiver tank deteriorates.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a receiver tank for a heat exchanger that can maintain strength, reduce weight, and improve gas-liquid separation performance.

  In order to solve the above-mentioned problems, a first aspect of the present invention provides a desiccant and a heat medium that are connected to a parallel flow heat exchanger via piping for inflow and outflow of the heat medium, and remove moisture in the heat medium. A receiver tank comprising a filter for filtering impurities therein, a lower cylindrical member having a connecting portion of the pipe at a side portion and an insertion port for the desiccant and a filter at a lower end, and the lower cylinder An upper cylindrical member joined to the upper end of the cylindrical member and closed at the upper end, and the upper cylindrical member is formed thinner than the lower cylindrical member, and the lower end of the upper cylindrical member or A fitting portion having an expanding taper portion toward the tip is formed at the upper end of the lower cylindrical member, and the upper cylindrical member and the lower cylindrical member are interposed with a brazing material interposed in the fitting portion. And brazing and joining , Characterized in that.

  In this invention, it is preferable to provide the fitting portion with a cylindrical portion that extends to the tip of the expansion taper portion and that fits the upper end portion of the lower cylindrical member or the lower end portion of the upper cylindrical member. Item 2).

  The invention according to claim 3 is the receiver tank for heat exchanger according to claim 1 or 2, wherein the desiccant is disposed from the inside of the upper cylindrical member to the upper side of the lower cylindrical member, and the lower tank A filter is disposed in the cylindrical member, and a plug body that supports the filter is fitted and fixed to an insertion port portion of the lower cylindrical member. A heat medium inflow port is provided, and a heat medium outflow port is provided in the vicinity of the lower side of the filter.

  (1) According to the first aspect of the present invention, the receiver tank includes a lower cylindrical member having a connecting portion of the heat medium pipe on the side and a desiccant and a filter insertion port on the lower end, and the lower portion. By forming the upper cylindrical member that is joined to the upper end of the cylindrical member and closed at the upper end, the lower cylindrical member having strength is made thick, and the thickness of the upper cylindrical member that requires less strength is thin. Therefore, the strength can be maintained and the overall weight can be reduced (weight reduction). Further, a fitting portion having an expanding taper portion toward the tip is formed at the lower end of the upper cylindrical member or the upper end of the lower cylindrical member, and the upper cylinder is interposed with a brazing material interposed in the fitting portion. Since the cylindrical member and the lower cylindrical member are fitted and brazed, the upper cylindrical member and the lower cylindrical member can be easily and airtightly joined. Further, the connecting portion between the upper cylindrical member and the lower cylindrical member can be lengthened compared to the case where the tapered portion is not provided, and the brazing force can be dispersed in the horizontal component. In addition to reducing the inflow of the wax, the drooping of the wax can be reduced. In addition, by providing the tapered portion, there is no sharp projecting portion at the small-diameter side taper starting portion of the member forming the tapered portion of the upper cylindrical member and the lower cylindrical member, so that it is accommodated in the bag body or the like. There is no risk of the desiccant getting caught and damaged. In addition, since the extension of the bent portion becomes gentle by providing the tapered portion, it is effective when a high-strength material that is difficult to extend to the upper cylindrical member and the lower cylindrical member is used.

  In addition, by providing a connecting portion for the inflow and outflow of the heat medium at the side of the lower cylindrical member, the liquid content of the heat medium flowing into the receiver tank flows into the liquid portion of the stored heat medium, and the gas gas Since the phase component can be guided to the upper part, the gas-liquid separation performance can be improved.

  (2) According to the invention described in claim 2, a cylinder that extends to the tip of the expansion taper portion and fits the upper end portion of the lower cylindrical member or the lower end portion of the upper cylindrical member into the fitting portion. By providing the portion, the upper cylindrical member and the lower cylindrical member can be easily and reliably fitted and fixed. Therefore, in addition to the first aspect of the invention, the upper cylindrical member and the lower cylindrical member can be joined easily and air-tightly.

  (3) According to the invention described in claim 3, the desiccant is disposed from the upper cylindrical member to the upper side of the lower cylindrical member, and the filter is disposed in the lower cylindrical member. A plug supporting the filter is fitted to the insertion opening of the cylindrical member via a seal member, and the plug is fixed by a locking member engaged with the insertion opening, so that the desiccant and the filter are removed. It can be built in airtight.

  In addition, a heat medium inflow port is provided above the filter in the lower cylindrical member, and a heat medium outflow port is provided near the lower side of the filter, thereby reducing the liquid content of the heat medium flowing into the receiver tank. Since it can flow into the liquid part of the stored heat medium and guide the gas vapor to the upper part, gas-liquid separation can be performed reliably, and only the liquid content of the heat medium is transferred from the receiver tank to the subcooled part of the condenser. It can be supplied stably.

  The best embodiment of the receiver tank for heat exchanger according to the present invention will be described in detail below.

<First Embodiment>
FIG. 1 is a front view showing an example of a parallel flow heat exchanger having a receiver tank according to the present invention, and FIGS. 2 and 3 are a plan view and a side view of FIG. 1, respectively.

  The condenser 1 (hereinafter referred to as the condenser 1), which is a parallel flow type heat exchanger, includes a plurality of aluminum header pipes 2a and 2b and a plurality of header pipes 2a and 2b installed in parallel with each other. The heat exchanger tube 3 is mainly composed of an aluminum heat exchange tube 3 and aluminum heat exchange fins, for example, corrugated fins 4, which are interposed between the heat exchanger tubes 3 and joined together. A receiver tank 10, which is an aluminum receiver, is connected to one header pipe 2 b of the capacitor 1 through an inflow pipe 7 and an outflow pipe 8 that are pipes for inflow and outflow of a heat medium (refrigerant). . A desiccant 30 and a filter 40 described later are inserted into the receiver tank 10.

  The header pipes 2a and 2b are formed, for example, in a substantially cylindrical shape by an aluminum extruded shape, and an aluminum end cap 5 is fixedly attached to the upper and lower ends thereof by brazing. Also, one header pipe 2a (left side in FIG. 1) is provided with a high-temperature heat medium inlet 2c near the outer upper end, for example, and a heat medium outlet 2d is provided near the outer lower end. It has been. Further, on the lower side surface of the header pipe 2b, as shown in FIG. 3, in order to communicate with the receiver tank 10, there are an outflow hole 6a and an inflow hole 6b constituting communication ports for outflow and inflow of the heat medium. The receiver tank 10 is connected through the inflow pipe 7 and the outflow pipe 8 so as to communicate with the outflow hole 6a and the inflow hole 6b.

  In addition, the partition plates 2e and 2f are arranged at about 1/3 of the upper part and about 1/6 of the lower part of the header pipe 2a. In addition, partition plates 2g and 2h are disposed at locations corresponding to the intermediate plate and the partition plate 2f in the header pipe 2b.

  Thus, by arranging the partition plates 2e, 2f, 2g, and 2h in the header pipes 2a and 2b, the high-temperature and high-pressure heat medium flowing into the header pipe 2a from the inflow hole 2c is superheated above the partition plate 2e. It flows in the heat exchange pipe 3 in the area 1A (high temperature area) and flows into the header pipe 2b. At this time, heat exchange is performed in a gaseous state, and the temperature of the heat medium drops. The heat medium that has flowed into the header pipe 2b flows through the heat exchange pipe 3 in the condensation zone 1B (gas-liquid two-phase zone) between the partition plates 2e and 2f and 2g, and then flows again into the header pipe 2b. At this time, heat exchange of latent heat is performed, and the state changes from a 100% gas state to a 100% liquid state. In this region, there is no temperature change accompanying the phase change. The liquid heat medium that has flowed into the header pipe 2a flows into the receiver tank 10 through the outflow hole 6a and the inflow pipe 7, and after being separated into gas and liquid by the receiver tank 10, the liquid heat medium is in the inflow hole 6b. And flows through the heat exchange pipe 3 in the subcooling zone 1C (subcool zone) below the partition plates 2f and 2h via the outflow pipe 8 and into the header pipe 2a. At this time, the heat medium undergoes heat exchange in a liquid state, and the temperature drops.

  The heat exchange tube 3 is formed, for example, in the shape of a flat plate with an aluminum extruded shape, and a heat medium flow path (not shown) that is divided into a plurality of sections that penetrates in the longitudinal direction. ) Is formed. Both ends of the heat exchange pipe 3 formed in this way are inserted and fixed in a plurality of slits (not shown) arranged in parallel with each other on the opposite sides of the side surfaces of both header pipes 2a and 2b. Has been.

  As shown in FIG. 1, the heat exchange fins, that is, the corrugated fins 4, are formed in a continuous wave shape by bending an aluminum plate, and are brazed between the heat exchange tubes 3. Has been. In this case, the corrugated fins 4 are also brazed and joined to the outer sides of the heat exchange tubes 3 arranged at the uppermost and lowermost stages, and both the corrugated fins 4 are protected in order to protect the corrugated fins 4. Further, the side plate 4a is brazed and joined to the outer side.

  On the other hand, as shown in FIGS. 4 and 5, the receiver tank 10 has a connecting portion 11 for the inflow pipe 7 and the outflow pipe 8 at the side, and a desiccant 30 and an insertion port 12 for the filter 40 at the lower end. The lower cylindrical member 15 and the upper cylindrical member 13 which is joined to the upper end of the lower cylindrical member 15 and whose upper end is closed by brazing the end cap 14 made of aluminum.

  In this case, the upper cylindrical member 13 is formed thinner than the lower cylindrical member 15. For example, when the inner diameter of the receiver tank 10 is 40 mm, the thickness t1 of the lower cylindrical member 15 is set to 2.7 mm while the thickness t1 of the upper cylindrical member 13 is set to 2.7 mm.

  Further, a fitting portion 18 having an expanding taper portion 16 toward the tip (lower end) and a cylindrical portion 17 extending downward from the tip of the expanding taper portion 16 at the lower end of the upper cylindrical member 13. Is formed. The upper end portion of the lower tubular member 15 is fitted into the tubular portion 17 of the fitting portion 18 via a brazing material, for example, a ring brazing material 50, and is joined by brazing. The ring brazing material 50 is set at the end of the cylindrical portion 17 after fitting the upper cylindrical member 13 and the lower cylindrical member 15, and the fitting surface of the upper cylindrical member 13 and the lower cylindrical member 15 is set. You may make it braze.

  Further, the insertion port 12 at the lower end of the lower cylindrical member 15 is expanded in diameter downward, and a circumferential groove 19 is formed on the expanded inner peripheral surface. The desiccant 30 (accommodated in the bag) is inserted into the lower cylindrical member 15 and the upper cylindrical member 13 through the insertion port 12 of the lower cylindrical member 15 formed in this manner, and the lower cylinder The filter 40 is disposed in the lower cylindrical member 15 from the upper side of the cylindrical member 15 to the upper cylindrical member 13, and the insertion port of the lower cylindrical member 15 The plug body 20 is fixed by a C ring 22 which is a locking member engaged with the circumferential groove 19 in a state where the plug body 20 is fitted through a seal member, for example, an O-ring 21 to support the filter 40.

  The connection portion 11 provided in the lower cylindrical member 15 is provided from the lower end portion of the desiccant 30 built in the receiver tank 10 to the lower end portion of the filter 40, and the heat medium is disposed above the filter 40. An inflow port 11 a is provided, and a heat medium outflow port 11 b is provided in the vicinity of the lower portion of the filter 40. The connecting portion 11 is provided with a mounting screw hole 11c, and the connection member 9 to which the inflow pipe 7 and the outflow pipe 8 are attached is screwed into the screw hole 11c with an unillustrated mounting screw. The inflow pipe 7 is connected to 11a, and the outflow pipe 8 is connected to the outflow port 11b.

  The upper cylindrical member 13 formed as described above is formed of an aluminum extruded profile. The lower end portion is formed with, for example, an expanded taper portion 16 and a cylindrical portion 17 by pressing. Further, the lower cylindrical member 15 is formed of an aluminum extruded shape integrally having a protruding portion that forms the connecting portion 11, and a portion other than the connecting portion 11 in the protruding portion is cut. The lower end portion is formed with an insertion port 12 whose diameter is increased by, for example, pressing. Note that the connecting portion 11 is not necessarily formed integrally with the lower cylindrical member 15, and may be formed separately from the lower cylindrical member 15 and brazed.

  In order to assemble the receiver tank 10 configured as described above, first, the ring brazing material 50 is set on the fitting portion 18 of the upper cylindrical member 13 installed upright in an upside down manner, and a flux is applied. In this state, the lower end portion of the lower cylindrical member 15 is inserted and fitted into the cylindrical portion 17 of the fitting portion 18. Then, the lower cylindrical member 15 and the upper cylindrical member 13 are brazed and joined by, for example, torch brazing. By this brazing, the brazing material is uniformly brazed over the entire circumference of the fitting portion between the lower cylindrical member 15 and the upper cylindrical member 13 by capillary action. At this time, a temperature condition suitable for the upper cylindrical member 13 and the lower cylindrical member 15 may be set. After the upper cylindrical member 13 and the lower cylindrical member 15 are brazed, or before the lower cylindrical member 15 and the upper cylindrical member 13 are brazed, the end cap 14 is placed in the upper end opening of the upper cylindrical member 13. Braze.

  Next, the desiccant 30 is inserted from the insertion port 12 of the lower cylindrical member 15, the filter 40 is inserted following the insertion of the desiccant 30, the plug body 20 is inserted so as to support the filter 40, The plug ring 20 is fitted and fixed in a water-tight manner by engaging a C-ring 22 in a circumferential groove 19 provided in the insertion port 12.

  The receiver tank 10 assembled as described above is connected to the condenser 1 integrally brazed in another process via the inflow pipe 7 and the outflow pipe 8. At this time, in consideration of the installation space of the vehicle, the receiver tank 10 can be disposed at an appropriate position in the vehicle longitudinal direction of the header pipe 2b. Thus, the capacitor | condenser 1 and the receiver tank 10 can be arrange | positioned in the predetermined position of a vehicle by positioning the receiver tank 10 in the vehicle front-back direction of the header pipe 2b.

  The capacitor 1 and the receiver tank 10 are connected by a loop belt-shaped attachment member 60. Further, mounting brackets 61 for fixing and holding the heat exchanger in, for example, the vehicle are mounted on the vertical positions of the header pipes 2a and 2b of the condenser 1.

Second Embodiment
Although the said embodiment demonstrated the case where the fitting part 18 which has the expansion taper part 16 and the cylinder part 17 was formed in the lower end part of the upper cylindrical member 13 which comprises the receiver tank 10, the lower cylindrical member 15 was demonstrated. A fitting portion 18A may be formed at the upper end of the upper cylindrical member 13 and the lower end of the upper cylindrical member 13 may be formed into a straight cylindrical shape. That is, a tapered portion 16A that expands toward the tip (upper end) is formed at the upper end portion of the lower cylindrical member 15, and a cylindrical portion 17A that extends upright is provided at the tip of the expanded taper portion 16A. A joining portion 18A may be formed, and the lower end portion of the upper tubular member 13 may be fitted into the tubular portion 17A of the fitting portion 18A via the ring brazing material 50 and brazed and joined.

  In the second embodiment, the other parts are the same as those in the first embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

It is a front view which shows an example for the parallel flow type heat exchangers which comprise the receiver tank which concerns on this invention. It is a top view of FIG. It is a side view of FIG. It is sectional drawing (a) which shows 1st Embodiment of the receiver tank concerning this invention, I part expanded sectional view (b) of (a), and II part expanded sectional view (c) of (a). It is an exploded sectional view of an important section of a receiver tank of a 1st embodiment. It is sectional drawing (a) which shows 2nd Embodiment of the receiver tank concerning this invention, and the III section expanded sectional view of (a). It is an exploded sectional view of an important section of a receiver tank of a 2nd embodiment.

Explanation of symbols

1 Condenser
2a, 2b Header pipe 3 Heat exchange pipe 4 Corrugated fin 7 Inflow pipe 8 Outflow pipe 10 Receiver tank 11 Connection part 12 Insertion port 13 Upper cylindrical member 14 End cap 15 Lower cylindrical member 16, 16A Expanding taper part 17, 17A Cylindrical part 18, 18A Fitting part 19 Circumferential groove 20 Plug body 21 O ring 22 C ring (locking member)
30 Desiccant 40 Filter 50 Ring brazing material t1 Thickness of lower cylindrical member t2 Thickness of upper cylindrical member

Claims (3)

A receiver tank that is connected to a parallel flow heat exchanger via piping for inflow and outflow of a heat medium, and includes a desiccant that removes moisture in the heat medium and a filter that filters impurities in the heat medium. ,
A lower cylindrical member having a connecting portion of the piping on the side and an insertion port for the desiccant and the filter on the lower end, and an upper cylindrical member joined to the upper end of the lower cylindrical member and closed at the upper end And consist of
Forming the thickness of the upper cylindrical member thin relative to the lower cylindrical member;
On the lower end of the upper cylindrical member or the upper end of the lower cylindrical member, a fitting portion having an expanding taper portion toward the tip is formed,
A heat exchanger receiver tank, wherein the upper cylindrical member and the lower cylindrical member are fitted and brazed and joined via a brazing material interposed in the fitting portion. The receiver tank for a heat exchanger according to claim 1,
The fitting portion includes a cylindrical portion that extends to the tip of the expansion taper portion and that fits and inserts the upper end portion of the lower cylindrical member or the lower end portion of the upper cylindrical member. Receiver tank. In the receiver tank for heat exchangers according to claim 1 or 2,
A desiccant is provided from the upper cylindrical member to the upper side of the lower cylindrical member, a filter is provided in the lower cylindrical member, and the filter is inserted in the insertion port of the lower cylindrical member. The plug body that supports is fitted through a seal member, and the plug body is fixed by a locking member that is engaged with the insertion port,
A heat exchanger receiver tank, wherein a heat medium inlet is provided at a position above the filter in the lower cylindrical member, and a heat medium outlet is provided at a lower vicinity of the filter.

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